Sound, music and wavelets in Marseille

keywords:
sound and music
first wavelet applications
signal analysis
sound synthesis
fast wavelet algorithms
instantaneous frequency estimation
sound invariants

uk: Математика, природничі науки

description: In this conference, I start by presenting the first applications and developments of wavelet methods made in Marseille in 1985 in the framework of sounds and music. A description of the earliest wavelet transform implementation using the SYTER processor is given followed by a discussion related to the first signal analysis investigations. Sound examples of the initial sound transformations obtained by altering the wavelet representation are further presented. Then methods aiming at estimating sound synthesis parameters such as amplitude and frequency modulation laws are described. Finally, new challenges brought by these early works are presented, focusing on the relationship between low-level synthesis parameters and sound perception and cognition. An example of the use of the wavelet transforms to estimate sound invariants related to the evocation of the "object" and the "action" is presented.

uk: вхід без авторизації


Franz Luef

type: Person

keywords:
modulation spaces
Banach-Gelfand triples
noncommutative tori
Moyal plane
noncommutative geometry
deformation quantization

cs: Matematika

de: Mathematik

fi: matematiikka

uk: Математика

en: Mathematics

fr: Mathématiques

da: Matematik

es: Matemáticas

nl: Wiskunde

de: Mathematik, Naturwissenschaften

uk: Математика, природничі науки

en: Mathematics, Natural Sciences

description: In my talk I am presenting a link between time-frequency analysis and noncommutative geometry. In particular, a connection between the Moyal plane, noncommutative tori and time-frequency analysis. After a brief description of a dictionary between these two areas I am going to explain some consequences for time-frequency analysis and noncommutative geometry such as the construction of projections in the mentioned operator algebras and Gabor frames.

TIB AV-Portal

type: Service

type: WebContent

type: MediaObject

@language: en

cs: přihlášení není vyžadováno

de: keine Anmeldung erforderlich

uk: вхід без авторизації

en: no login required

nl: geen login vereist

name: Noncommutative geometry and time-frequency analysis

name: Centre International de Rencontres Mathématiques (CIRM)

addressCountry: FR

addressLocality: Marseille

addressRegion: Provence-Alpes-Côte d'Azur

type: Organization

cs: Video

de: Video

fi: Video

uk: Відео

en: Video

fr: Vidéo

da: Video

nl: Video

es: Video


Phase-space delocalization

uk: Математика, природничі науки

uk: вхід без авторизації


An « ISI » perspective on wavelets

keywords:
wavelets
history
bibliometry
network, paradigm

uk: Математика, природничі науки

description: The introduction of wavelets in the mid 80's has significantly reshaped some areas of the scientific landscape by establishing bridges between previously disconnected domains, and eventually leading to a new paradigm. This generally accepted-yet loose-claim can be given a more precise form by exploiting bibliometric databases such as the ISI Web of Science. Preliminary results in this direction will be reported here, based on multiple entries where authors, references, keywords and disciplines are used as nodes of a network in which the links correspond to their co-appearance in the same paper. While the evolution in time of such an « heterogeneous net » gives a quantified perspective on the birth and growth of wavelets as a well-identified scientific field of its own, it also raises many interpretation issues (related, e.g., to automation vs. expertise) whose implications go beyond this peculiar case study.

uk: вхід без авторизації


Continuous (semi-)frames revisited

keywords:
continuous frames
semi-frames
frame duality
reproducing pairs
partial inner product spaces

uk: Математика, природничі науки

description: We start by recalling the essential features of frames, both discrete and continuous, with some emphasis on the notion of frame duality. Then we turn to generalizations, namely upper and lower semi-frames, and their duality. Next we consider arbitrary measurable maps and examine the standard operators, analysis, synthesis and frame operators, and study their properties. Finally we analyze the recent notion of reproducing pairs. In view of their duality structure, we introduce two natural partial inner product spaces and formulate a number of open questions.

uk: вхід без авторизації


keywords:
wavelet theory
time-frequency analysis
modulation spaces
Banach-Gelfand-triples
Toeplitz operators
atomic decompositions
function spaces
shearlet transform
Blaschke group

uk: Математика, природничі науки

description: Coorbit theory was developed in the late eighties as a unifying principle covering (possible non-)orthogonal frame expansions in the wavelet and in the time-frequency context. Very much in the spirit of « coherent frames » or also reproducing kernels for a Moebius invariant Banach space of analytic functions one can describe a family of function spaces associated with a given integrable and irreducible group representation on a Hilbert space by its generalized wavelet transform, and obtain (among others) atomic decomposition results for the resulting spaces. The theory was flexible enough to cover also more recent examples, such as voice transforms related to the Blaschke group or the spaces (and frames) related to the shearlet transform. As time permits I will talk also on the role of Banach frames and the usefulness of Banach Gelfand triples, especially the one based on the Segal algebra , which happens to be a modulation space, in fact the minimal among all time-frequency invariant non-trivial function spaces.

uk: вхід без авторизації

name: Wavelet theory, coorbit spaces and ramifications


Some perspectives of CHA in numerics

uk: Математика, природничі науки

description: Wavelets are standard tool in signal- and image processing. It has taken a long time until wavelet methods have been accepted in numerical analysis as useful tools for the numerical discretization of certain PDEs. In the signal- and image processing community several new frame constructions have been introduced in recent years (curvelets, shearlets, ridgelets, ...). Question: Can they be used also in numerical analysis? This talk: Small first step.

uk: вхід без авторизації


uk: Математика, природничі науки

uk: вхід без авторизації

name: The joy and pain of wavelets in numerical simulation


keywords:
wavelets
fractals
stochastic processes
sparsity
independent component analysis
differential operators
iterative thresholding
infinitely divisible laws
Lévy processes

uk: Математика, природничі науки

description: We start with a brief historical account of wavelets and of the way they shattered some of the preconceptions of the 20th century theory of statistical signal processing that is founded on the Gaussian hypothesis. The advent of wavelets led to the emergence of the concept of sparsity and resulted in important advances in image processing, compression, and the resolution of ill-posed inverse problems, including compressed sensing. In support of this change in paradigm, we introduce an extended class of stochastic processes specified by a generic (non-Gaussian) innovation model or, equivalently, as solutions of linear stochastic differential equations driven by white Lévy noise. Starting from first principles, we prove that the solutions of such equations are either Gaussian or sparse, at the exclusion of any other behavior. Moreover, we show that these processes admit a representation in a matched wavelet basis that is "sparse" and (approximately) decoupled. The proposed model lends itself well to an analytic treatment. It also has a strong predictive power in that it justifies the type of sparsity-promoting reconstruction methods that are currently being deployed in the field.

uk: вхід без авторизації

name: Wavelets and stochastic processes: how the Gaussian world became sparse


Wavelet: from statistic to geometry

keywords:
heat kernel
functional calculus
wavelet
Gaussian process

uk: Математика, природничі науки

description: Since the last twenty years, Littlewood-Paley analysis and wavelet theory has proved to be a very useful tool for non parametric statistic. This is essentially due to the fact that the regularity spaces (Sobolev and Besov) could be characterized by wavelet coefficients. Then it appeared that that the Euclidian analysis is not always appropriate, and lot of statistical problems have their own geometry. For instance: Wicksell problem and Jacobi Polynomials, Tomography and the harmonic analysis of the ball, the study of the Cosmological Microwave Background and the harmonic analysis of the sphere. In these last years it has been proposed to build a Littlewood-Paley analysis and a wavelet theory associated to the Laplacien of a Riemannian manifold or more generally a positive operator associated to a suitable Dirichlet space with a good behavior of the associated heat kernel. This can help to revisit some classical studies of the regularity of Gaussian field.

uk: вхід без авторизації


keywords:
compressive sensing
time-frequency analysis
wavelets
sparsity
random matrices
minimization
radar
wireless communications

uk: Математика, природничі науки

description: One of the important "products" of wavelet theory consists in the insight that it is often beneficial to consider sparsity in signal processing applications. In fact, wavelet compression relies on the fact that wavelet expansions of real-world signals and images are usually sparse. Compressive sensing builds on sparsity and tells us that sparse signals (expansions) can be recovered from incomplete linear measurements (samples) efficiently. This finding triggered an enormous research activity in recent years both in signal processing applications as well as their mathematical foundations. The present talk discusses connections of compressive sensing and time-frequency analysis (the sister of wavelet theory). In particular, we give on overview on recent results on compressive sensing with time-frequency structured random matrices.

uk: вхід без авторизації

name: Compressive sensing with time-frequency structured random matrices


keywords:
breast cancer
X-ray mammography
infrared thermography
multifractal analysis
wavelet transform
wavelet transform modulus maxima method

uk: Математика, природничі науки

description: Breast cancer is the most common type of cancer among women and despite recent advances in the medical field, there are still some inherent limitations in the currently used screening techniques. The radiological interpretation of X-ray mammograms often leads to over-diagnosis and, as a consequence, to unnecessary traumatic and painful biopsies. First we use the 1D Wavelet Transform Modulus Maxima (WTMM) method to reveal changes in skin temperature dynamics of women breasts with and without malignant tumor. We show that the statistics of temperature temporal fluctuations about the cardiogenic and vasomotor perfusion oscillations do not change across time-scales for cancerous breasts as the signature of homogeneous monofractal fluctuations. This contrasts with the continuous change of temperature fluctuation statistics observed for healthy breasts as the hallmark of complex multifractal scaling. When using the 2D WTMM method to analyze the roughness fluctuations of X-ray mammograms, we reveal some drastic loss of roughness spatial correlations that likely results from some deep architectural change in the microenvironment of a breast tumor. This local breast disorganisation may deeply affect heat transfer and related thermomechanics in the breast tissue and in turn explain the loss of multifractal complexity of temperature temporal fluctuations previously observed in mammary glands with malignant tumor. These promising findings could lead to the future use of combined wavelet-based multifractal processing of dynamic IR thermograms and X-ray mammograms to help identifying women with high risk of breast cancer prior to more traumatic examinations. Besides potential clinical impact, these results shed a new light on physiological changes that may precede anatomical alterations in breast cancer development.

uk: вхід без авторизації

name: Wavelet-based multifractal analysis of dynamic infrared thermograms and X-ray mammograms to assist in early breast cancer diagnosis


keywords:
wavelets
Gabor
analysis-synthesis
computer music

uk: Математика, природничі науки

description: This presentation reminds of some early sonic representations and of their utility for musical sound synthesis and processing, prior to the introduction of wavelets by Morlet and Grossmann. It reminds the circumstances of the work performed at the Laboratoire de Mécanique et d'Acoustique, Marseille, by Richard Kronland-Martinet with Alex Grossmann on wavelet transforms of sounds and by Daniel Arfib and Frédéric Boyer on the Gabor representation. It is illustrated by short sound and video examples.

uk: вхід без авторизації

name: Sound, music and wavelets in Marseille: A reminder of early sonic representations and of the encounter with wavelets


uk: Математика, природничі науки

uk: вхід без авторизації

name: High dimensional learning from images to physics


uk: Математика, природничі науки

uk: вхід без авторизації

name: From function spaces to stylometry: the wavelet bridge


keywords:
wavelets
filter banks
subband coding
uncertainty principle
sampling theory
sparse sampling

uk: Математика, природничі науки

description: In this talk, we will briefly look at the history of wavelets, from signal processing algorithms originating in speech and image processing, and harmonic analysis constructions of orthonormal bases. We review the promises, the achievements, and some of the limitations of wavelet applications, with JPEG and JPEG2000 as examples. We then take two key insights from the wavelet and signal processing experience, namely the time-frequency-scale view of the world, and the sparsity property of wavelet expansions, and present two recent results. First, we show new bounds for the time-frequency spread of sequences, and construct maximally compact sequences. Interestingly they differ from sampled Gaussians. Next, we review work on sampling of finite rate of innovation signals, which are sparse continuous-time signals for which sampling theorems are possible. We conclude by arguing that the interface of signal processing and applied harmonic analysis has been both fruitful and fun, and try to identify lessons learned from this experience.

uk: вхід без авторизації

name: Wavelets and signal processing: a match made in heaven


keywords:
sparsity
morphological diversity
inpainting
cosmology
weak lensing
cosmic microwave background

uk: Математика, природничі науки

uk: вхід без авторизації

name: Wavelets and inverse problems in astrophysics


keywords:
twistor spaces
K3 surfaces
cycle space
period domain

uk: Математика, природничі науки

description: Twistor spaces of K3 surfaces are non-Kähler compact complex manifolds which play a fundamental role in the moduli theory of K3 surfaces. They come equipped with a holomorphic submersion to the complex projective line which under the period map corresponds to a twistor line in the K3-period domain. In this talk I will explain how one can view a twistor line as a certain base point in the linear cycle space of the period domain. Then, based on joint work in progress with Daniel Greb, Tim Kirschner and Martin Schwald I will present new results concerning the deformations of twistor spaces of K3 surfaces and their relation to the cycle space of the period domain.

uk: вхід без авторизації

name: Deformation theory of twistor spaces of K3 surfaces


uk: Математика, природничі науки

description: Hyperkähler manifolds are higher-dimensional analogs of K3 surfaces. Verbitsky and Markmann recently proved that their period map is an open embedding. In a joint work with E. Macri, we explicitly determine the image of this map in some cases. I will explain this result together with a nice application (found by Bayer and Mongardi) to the (almost complete) determination of the image of the period map for cubic fourfolds, hereby partially recovering a result of Laza.

uk: вхід без авторизації

name: Periods of polarized hyperkähler manifolds


keywords:
Kobayashi hyperbolic variety
directed manifold
genus of a curve
jet bundle
jet differential
jet metric
Chern connection and curvature
negativity of jet curvature
variety of general type
Kobayashi conjecture
Green-Griffiths conjecture
Lang conjecture

uk: Математика, природничі науки

description: A famous conjecture of Kobayashi from the 1970s asserts that a generic algebraic hypersurface of sufficiently large degree in the complex projective space of dimension is hyperbolic. Yum-Tong Siu introduced several fundamental ideas that led recently to a proof of the conjecture. In 2016, Damian Brotbek gave a new geometric argument based on the use of Wronskian operators and on an analysis of the geometry of Semple jet bundles. Shortly afterwards, Ya Deng obtained effective degree bounds by means of a refined technique. Our goal here will be to explain a drastically simpler proof that yields an improved (though still non optimal) degree bound, e.g. . We will also present a more general approach that could possibly lead to optimal bounds.

uk: вхід без авторизації

name: Improved bounds for the Kobayashi conjecture on generic hyperbolicity


keywords:
nonabelian Hodge theory
KLT singularities
ball quotients
uniformisation
Higgs sheaves

uk: Математика, природничі науки

description: Simpson's classic nonabelian Hodge correspondence establishes an equivalence of categories between local systems on a projective manifold, and certain Higgs sheaves on that manifold. This talk surveys recent generalisations of Simpson's correspondence to the context of projective varieties with klt singularities. Perhaps somewhat surprisingly, these spaces exhibit two correspondences: one pertaining to local systems on the whole space, and one to local systems on its smooth locus. As one application, we resolve the quasi-étale uniformisation problem for minimal varieties of general type, and to obtain a complete numerical characterisation of singular quotients of the unit ball by discrete, co-compact groups of automorphisms that act freely in codimension one.

uk: вхід без авторизації

name: Nonabelian Hodge correspondences for klt varieties and quasi-etale uniformisation


keywords:
Cremona group
Sarkisov program
abelianization
non-closed fields

uk: Математика, природничі науки

description: The plane Cremona group is the group of birational transformations of the projective plane. I would like to discuss why over algebraically closed fields there are no homomorphisms from the plane Cremona group to a finite group, but for certain non-closed fields there are (in fact there are many).

uk: вхід без авторизації

name: Signature morphisms from the Cremona group


keywords:
Chow groups
K3 surfaces
algebraic cycles
hypersurfaces
gonality
abelian varieties

uk: Математика, природничі науки

description: The gonality of a variety is defined as the minimal gonality of curve sitting in the variety. We prove that the gonality of a very general abelian variety of dimension goes to infinity with g. We use for this a (straightforward) generalization of a method due to Pirola that we will describe. The method also leads to a number of other applications concerning -cycles modulo rational equivalence on very general abelian varieties.

uk: вхід без авторизації

name: Gonality and zero-cycles of abelian varieties


Interview au CIRM : Claire Voisin

uk: Математика, природничі науки

@language: fr

uk: вхід без авторизації

name: Centre International de Rencontres Mathématiques (CIRM)


uk: Математика, природничі науки

description: The Gibbs measure of many disordered systems at low temperature may exhibit a very strong dependance on even tiny variations of temperature, usually called “temperature chaos”. I will discuss this question for Spin Glasses. I will report on a recent work with Eliran Subag (Courant) and Ofer Zeitouni (Weizmann and Courant), where we give a detailed geometric description of the Gibbs measure at low temperature, which in particular implies temperature chaos for a general class of spherical Spin Glasses at low temperature. This question has a very long past in the physics literature, and an interesting recent history in mathematics. Indeed, in 2015, Eliran Subag has given a very sharp description of the Gibbs measure for pure p-spin spherical Spin Glasses at low temperature, building on results on the complexity of these spin glasses by Auffinger-Cerny and myself. This description (close to the so-called Thouless-Anderson-Palmer picture) excludes the existence of temperature chaos for the pure p-spin!! The recent work gives an extension of this very detailed geometric description of the Gibbs measure to the case of general mixed models, and shows that in fact the pure p-spin is very singular.

uk: вхід без авторизації

name: Geometric description of the spherical Spin-Glass Gibbs measures and temperature chaos


Remarks on the Riemann hypothesis

uk: Математика, природничі науки

description: One fairly standard version of the Riemann Hypothesis (RH) is that a specific probability density on the real line has a moment generating function (Laplace transform) that as an analytic function on the complex plane has all its zeros pure imaginary. We'll review a series of results that span the period from the 1920's to 2018 concerning a perturbed version of the RH. In that perturbed version, due to Polya, the log of the probability density is modified by a kind of mass term (in quantum field theory language). This gives rise to an implicitly defined real constant known as the de Bruijn-Newman Constant, Lambda. The conjecture and now theorem (Newman 1976, Rodgers and Tau 2018) that Lambda is greater than or equal to zero is complementary to the RH which is equivalent to Lambda less than or equal to zero; The conjecture/theorem is a version of the dictum that the RH, if true, is only barely so. We'll also briefly discuss some connections with quantum field theory and the Lee-Yang circle theorem.

uk: вхід без авторизації


uk: Математика, природничі науки

description: For some growth models in the Kardar-Parisi-Zhang universality class, the large time limit process of the interface profile is well established. Correlations in space-time are much less understood. Along special space-time lines, called characteristics, there is a sort of ageing. We study the covariance of the interface process along characteristic lines for generic initial conditions.

uk: вхід без авторизації

name: Space-time covariance of KPZ growth models


keywords:
sparse graphs
graphex
dense exchangeable graphs
graphon
network data
Aldous Hoover theorem

uk: Математика, природничі науки

description: Graphons and graphexes are limits of graphs which allow us to model and estimate properties of large-scale networks. In this pair of talks, we review the theory of dense graph limits, and give two alterative theories for limits of sparse graphs – one leading to unbounded graphons over probability spaces, and the other leading to bounded graphons (and graphexes) over sigma-finite measure spaces. Talk I, given by Jennifer, will review the general theory, highlight the unbounded graphons, and show how they can be used to consistently estimate properties of large sparse networks. This talk will also give an application of these sparse graphons to collaborative filtering on sparse bipartite networks. Talk II, given by Christian, will recast limits of dense graphs in terms of exchangeability and the Aldous Hoover Theorem, and generalize this to obtain sparse graphons and graphexes as limits of subgraph samples from sparse graph sequences. This will provide a dual view of sparse graph limits as processes and random measures, an approach which allows a generalization of many of the well-known results and techniques for dense graph sequences.

uk: вхід без авторизації

name: Graphons and graphexes as limits of sparse graphs - lecture 1


uk: Математика, природничі науки

uk: вхід без авторизації

name: Graphons and graphexes as limits of sparse graphs - lecture 2


keywords:
Lokka-Zervos-type alternative
optimal dividends
capital injections
buffered eflection
Cramer-Lundberg model
absolutely continuous supersolutions
scale functions

uk: Математика, природничі науки

description: The recent papers Gajek-Kucinsky (2017), Avram-Goreac-LiWu (2020) investigated the control problem of optimizing dividends when limiting capital injections by bankruptcy is taken into consideration. The first paper works under the spectrally negative Levy model; the second works under the Cramer-Lundberg model with exponential jumps, where the results are considerably more explicit. The first talk extends, exploiting the W-Z scale functions, results of Gajek-Kucinsky (2017) to the case when a final penalty is taken into consideration as well. This requires the introduction of new scale and Gerber-Shiu functions. The second talk illustrates the fact that quite reasonable approximations of the general problem may be obtained using the exponential particular case studied in Avram-Goreac-LiWu (2020). We start by experimenting with de Vylder type approximations for the scale function ; this amounts essentially to replacing our process by one with exponential jumps and cleverly crafted parameters based on the first three moments of the claims. We show that very good approximations may be obtained for two fundamental objects of interest: the growth exponent of the scale function , and the (last) global minimum of , which is fundamental in the de Finetti barrier problem. Turning then to the dividends and limited capital injections problem, we show that a new exponential approximation specific to this problem achieves very good results: it consists in plugging into the objective function for exponential claims the exact "non-exponential ingredients" (scale functions and, survival and mean functions) of our non-exponential examples.

uk: вхід без авторизації

name: Optimizing dividends and limited capital injections via exponential approximations I


uk: Математика, природничі науки

description: After an overview of some approaches to define random sequences, we will discuss pseudorandom sequences and low-discrepancy sequences. Applications to numerical integration, Koksma-Hlawka inequality, and Niederreiter's uniform point sets will be discussed. We will then present randomized quasi-Monte Carlo sequences.

uk: вхід без авторизації

name: Number sequences for simulation - lecture 1


keywords:
financial mathematics
derivative pricing
Monte-Carlo simulation

uk: Математика, природничі науки

description: I present the basics and numerical result of two (or three) concrete applications of quasi-Monte-Carlo methods in financial engineering. The applications are in: derivative pricing, in portfolio selection, and in credit risk management.

uk: вхід без авторизації

name: Two concrete FinTech applications of QMC


keywords:
Quasi-Monte Carlo
stochastic differential equations
irregular coefficients

uk: Математика, природничі науки

description: In the first part, we briefly recall the theory of stochastic differential equations (SDEs) and present Maruyama's classical theorem on strong convergence of the Euler-Maruyama method, for which both drift and diffusion coefficient of the SDE need to be Lipschitz continuous.

uk: вхід без авторизації

name: Brief introduction of Quasi-Monte Carlo Methods and their Applications


keywords:
sensitivity analysis
uncertainty avantification

uk: Математика, природничі науки

description: Estimation of conditional quantiles is requiered for many purposes, in particular when the conditional mean is not suffisiant to describe the impact of covariates on the dependent variable. For example, one may estimate the quantile of one financial index (e.g. WisdomTree Japan Hedged Equity Fund) knowing financial indeces from other countries. It is also requiered to estimated conditional quantiles in Quantile Oriented Sensitivity Analysis (QOSA). QOSA indices are relevant in order to quantify uncertainty on quantiles, for example in insurance operational risk contexts. We shall present several view points on conditional quantile estimation: quantile regression and improvements, Kernel based estimation, random forest estimation. We shall focus on applications to QOSA.

uk: вхід без авторизації

name: On the estimation of conditional quantiles - lecture 1


keywords:
MCMC
no-reversibility
Gibbs sampling

uk: Математика, природничі науки

description: In this talk, we derive a novel non-reversible, continuous-time Markov chain Monte Carlo (MCMC) sampler, called Coordinate Sampler, based on a piecewise deterministic Markov process (PDMP), which can be seen as a variant of the Zigzag sampler. In addition to proving a theoretical validation for this new sampling algorithm, we show that the Markov chain it induces exhibits geometrical ergodicity convergence, for distributions whose tails decay at least as fast as an exponential distribution and at most as fast as a Gaussian distribution. Several numerical examples highlight that our coordinate sampler is more efficient than the Zigzag sampler, in terms of effective sample size.

uk: вхід без авторизації

name: The coordinate sampler: a non-reversible Gibbs-like MCMC sampler


keywords:
risk theory
Markov process
quasi Monte-Carlo integration

uk: Математика, природничі науки

description: This talk will give an overview on the usage of piecewise deterministic Markov processes for risk theoretic modeling and the application of QMC integration in this framework. This class of processes includes several common risk models and their generalizations. In this field, many objects of interest such as ruin probabilities, penalty functions or expected dividend payments are typically studied by means of associated integro-differential equations. Unfortunately, only particular parameter constellations allow for closed form solutions such that in general one needs to rely on numerical methods. Instead of studying these associated integro-differential equations, we adapt the problem in a way that allows us to apply deterministic numerical integration algorithms such as QMC rules.

uk: вхід без авторизації

name: Risk theory: models and objectives: PDMPs in risk theory and QMC integration I


keywords:
quasi Monte Carlo methods
low discrepancy sequences
deterministic errors bounds

uk: Математика, природничі науки

uk: вхід без авторизації

name: Quasi-Monte Carlo methods and applications: introduction


uk: Математика, природничі науки

description: The models of Bachelier and Samuelson will be introduced. Methods for generating number sequences from non-uniform distributions, such as inverse transformation and acceptance rejection, as well as generation of stochastic processes will be discussed. Applications to pricing options via rendomized quasi-Monte Carlo methods will be presented.

uk: вхід без авторизації

name: Derivative pricing, simulation from non-uniform distributions - lecture 3


uk: Математика, природничі науки

uk: вхід без авторизації

name: PDMPs and Integrals: PDMPs in risk theory and QMC integration II


uk: Математика, природничі науки

uk: вхід без авторизації

name: Number sequences for simulation - lecture 2


Stochastic differential equations

uk: Математика, природничі науки

description: In the second part we show how the classical result can be used also for SDEs with drift that may be discontinuous and diffusion that may be degenerate. In that context I will present a concept of (multidimensional) piecewise Lipschitz drift where the set of discontinuities is a sufficiently smooth hypersurface in the multi-dimensional euclidean space. We discuss geometric properties of the set of discontinuities that are needed to transfer the convergence result from the Lipschitz case to the piecewise Lipschitz case.

uk: вхід без авторизації


uk: Математика, природничі науки

uk: вхід без авторизації

name: On the estimation of conditional quantiles - lecture 2


uk: Математика, природничі науки

uk: вхід без авторизації

name: On the estimation of conditional quantiles - lecture 3

name: Centre International de Rencontres Mathématiques (CIRM)


uk: Математика, природничі науки

uk: вхід без авторизації

name: PDMPs in risk theory and QMC integration III


Basics in machine learning - lecture 1

uk: Математика, природничі науки

description: This course introduces fundamental concepts in machine learning and presents some classical approaches and algorithms. The scikit-learn library is presented during the practical sessions. The course aims at providing fundamental basics for using machine learning techniques.

uk: вхід без авторизації


Basics in machine learning - lecture 2

uk: Математика, природничі науки

uk: вхід без авторизації


uk: Математика, природничі науки

uk: вхід без авторизації

name: Basics in machine learning - practical session 1


uk: Математика, природничі науки

uk: вхід без авторизації

name: Basics in machine learning - practical session 2


Reinforcement learning - lecture 1

uk: Математика, природничі науки

description: Reinforcement learning (RL) studies the problem of learning how to optimally controlling a dynamical and stochastic environment. Unlike in supervised learning, a RL agent does not receive a direct supervision on which actions to take in order to maximize the longterm reward, and it needs to learn from the samples collected through direct interaction with the environment. RL algorithms combined with deep learning tools recently achieved impressive results in a variety of problems ranging from recommendation systems to computer games, often reaching human-competitive performance (e.g., in the Go game). In this course, we will review the mathematical foundations of RL and the most popular algorithmic strategies. In particular, we will build around the model of Markov decision processes (MDPs) to formalize the agent-environment interaction and ground RL algorithms into popular dynamic programming algorithms, such as value and policy iteration. We will study how such algorithms can be made online, incremental and how to integrate approximation techniques from the deep learning literature. Finally, we will discuss the problem of the exploration-exploitation dilemma in the simpler bandit scenario as well as in the full RL case. Across the course, we will try to identify the main current limitations of RL algorithms and the main open questions in the field.

uk: вхід без авторизації


Reinforcement learning - lecture 2

uk: Математика, природничі науки

uk: вхід без авторизації


Reinforcement learning - lecture 3

uk: Математика, природничі науки

uk: вхід без авторизації


Reinforcement learning - lecture 4

uk: Математика, природничі науки

uk: вхід без авторизації


Signal processing tutorial - part 1

uk: Математика, природничі науки

description: Processing signals presents many challenges by the quantity, structure, faults, heterogeneity of sensor data recorded over time. Supporting decisions using prediction or detection based on data streams naturally calls Machine Learning techniques (and theory!) for backup. The latter field has witnessed a tremendous development since the publication of Vladimir Vapnik's best-seller 'The Nature of Statistical Learning' and the invention of Support Vector Machines, Bagging, Boosting and Random Forests between 1995 and 1999 until the latest technological breakthroughs based on Deep Learning. However, most of its reference frameworks and methods consider vector observations which are essentially invariant up to a permutation of the indices of vector components. Beyond the obvious approach of featurization (or embedding) time series into vectors of characteristics (features), there are other more subtle interactions between the two fields of SP and ML but they first need to address some fundamental questions such as: - how to monitor the lack of stationarity in time - dependent data - how to supervise such data - what is the objective of learning (prediction goal) in this context, and more generally what can be learned with signals - how to account for additional structure in signals - how Signal Processing as a field may benefit from modern optimization techniques The purpose of this course is to offer an overview on some Signal Processing problems from the angle of Machine Learning philosophy and techniques in order to develop insights on the fundamental questions formulated above. In other terms, this is not a standard course on Signal Processing and we may skip some of the very fundamental concepts that would belong to such a course.

uk: вхід без авторизації


Signal processing tutorial - part 2

uk: Математика, природничі науки

uk: вхід без авторизації


keywords:
apprentissage profond
traitement du signal
transformée en scattering

uk: Математика, природничі науки

description: Since 2012, deep neural networks have led to outstanding results in many various applications, literally exceeding any previously existing methods, in texts, images, sounds, videos, graphs... They consist of a cascade of parametrized linear and non-linear operators whose parameters are optimized to achieve a fixed task. This talk addresses 4 aspects of deep learning through the lens of signal processing. First, we explain image classification in the context of supervised learning. Then, we show several empirical results that allow us to get some insights about the black box of neural networks. Third, we explain how neural networks create invariant representation: in the specific case of translation, it is possible to design predefined neural networks which are stable to translation, namely the Scattering Transform. Finally, we discuss several recent statistical learning, about the generalization and approximation properties of this deep machinery.

uk: вхід без авторизації

name: One signal processing view on deep learning - lecture 1


uk: Математика, природничі науки

uk: вхід без авторизації

name: One signal processing view on deep learning - lecture 2


Optimization - lecture 1

uk: Математика, природничі науки

description: During the last 20 years, imaging sciences, including inverse problems, segmentation or classification, has known two major revolutions: (i) sparsity and proximal algorithms and (ii) deep learning and stochastic optimization. This course proposes to illustrate these major advances in the context of imaging problems that can be formulated as the minimization of an objective function and to highlight the evolution of these objective functions jointly with optimization advances. Since 2003, convex optimization has become the main thrust behind significant advances in signal processing, image processing and machine learning. The increasingly complex variational formulations encountered in these areas which may involve a sum of several, possibly non-smooth, convex terms, together with the large sizes of the problems at hand make the use of standard optimization methods such as those based on subgradient descent techniques intractable computationally. Since their introduction in the signal processing arena, splitting techniques have emerged as a central tool to circumvent these roadblocks: they operate by breaking down the problem into individual components that can be activated individually in the solution algorithm. In the past decade, numerous convex optimization algorithms based on splitting techniques have been proposed or rediscovered in an attempt to efficiently deal with such problems. We will provide the basic building blocks for major proximal algorithm strategies and their recent advances in nonconvex and stochastic optimization. Behind non-smooth functions, there is the concept of sparsity which is central in the contributions in inverse problems and compressed sensing. This concept will be described as well as the objective functions relying on it, going from Mumford-Shah model to sparse SVM. Ten years after the start of proximal revolution, deep learning has started to provide a new framework for solving imaging problems going from agnostic techniques to models combining deep learning with standard regularized formulation. The main encountered objective functions as well as the associated algorithmic strategies will be discussed.

uk: вхід без авторизації


Optimization - lecture 2

uk: Математика, природничі науки

uk: вхід без авторизації


Optimization - lecture 3

uk: Математика, природничі науки

uk: вхід без авторизації


Optimization - lecture 4

uk: Математика, природничі науки

uk: вхід без авторизації


uk: Математика, природничі науки

description: Safaa, Al-Ali

uk: вхід без авторизації

name: Teasing poster: mathematics, signal processing and learning


uk: Математика, природничі науки

description: The relations between some quantities related to the Laplace operator are considered. In particular, principal eigenvalue and torsional rigidity are studied in the class of general domains, convex domains, and domains with a small thickness. This allows to obtain a detailed description of the Blasche-Santaló diagram of the two quantities. Several open questions are discussed, in particular when the Laplacian is replaced by the -Laplacian.

uk: вхід без авторизації

name: Upper and lower bounds for some shape functionals


keywords:
Möbius strip
Laplace-Beltrami operator
spectrum
effective hamiltonian
resolvent convergence
quantisation on submanifolds

uk: Математика, природничі науки

description: The Laplace–Beltrami operator in the curved Möbius strip is investigated in the limit when the width of the strip tends to zero. By establishing a norm-resolvent convergence, it is shown that spectral properties of the operator are approximated well by an unconventional flat model whose spectrum can be computed explicitly in terms of Mathieu functions. Contrary to the traditional flat Möbius strip, our effective model contains a geometric potential. A comparison of the three models is made and analytical results are accompanied by numerical computations.

uk: вхід без авторизації

name: Spectrum of the Möbius strip: true, fake and not-so-fake


keywords:
Dirichlet-to-Neumann map
Laplace operator
Steklov eigenvalues
eigenvalue asymptotics

uk: Математика, природничі науки

description: How close is the Dirichlet-to-Neumann map to the square root of the corresponding boundary Laplacian? This question has been actively investigated in recent years. Somewhat surprisingly, a lot of techniques involved can be traced back to a newly rediscovered manuscript of Lars Hörmander from the 1950s. We present Hörmander's approach and its applications, with an emphasis on eigenvalue estimates and spectral asymptotics.

uk: вхід без авторизації

name: The Dirichlet-to-Neumann map, the boundary Laplacian and Hörmander's rediscovered manuscript


keywords:
a priori estimates
comparison principle
mixed boundary conditions
Robin boundary conditions

uk: Математика, природничі науки

description: We show, using symmetrization techniques, that it is possible to prove a comparison principle (we are mainly focused on L1 comparison) between solutions to an elliptic partial differential equation on a smooth bounded set Ω with a rather general boundary condition, and solutions to a suitable related problem defined on a ball having the same volume as Ω. This includes for instance mixed problems.

uk: вхід без авторизації

name: Sharp inequalities for solutions to elliptic problems with mixed boundary conditions


keywords:
time discretization
strong stability
Runge-Kutta
multistep methods

uk: Математика, природничі науки

description: When designing high order schemes for solving time-dependent kinetic and related PDEs, we often first develop semi-discrete schemes paying attention only to spatial discretizations and leaving time continuous. It is then important to have a high order time discretization to main the stability properties of the semi-discrete schemes. In this talk we discuss two classes of high order time discretization, i.e, the strong stability preserving (SSP) time discretization, which preserves strong stability from a stable spatial discretization with Euler forward, and the explicit Runge-Kutta methods, for which strong stability can be proved in many cases for semi-negative linear semi-discrete schemes. Numerical examples will be given to demonstrate the performance of these schemes.

uk: вхід без авторизації

name: Stability of time discretizations for semi-discrete high order schemes for kinetic and related PDEs


uk: Математика, природничі науки

uk: вхід без авторизації

name: Approximate entropy-based moment closures


uk: Математика, природничі науки

uk: вхід без авторизації

name: High order Eulerian numerical schemes for hybrid fluid-kinetic model


keywords:
mean field modeling
quasilinear diffusion
finite elements method
mathematical physics

uk: Математика, природничі науки

description: Quasi-linear diffusion of magnetized fast electrons in momentum space results from stimulated emission and absorption of waves packets via wave-particle resonances. Such model consists in solving the dynamics of a system of classical kinetic diffusion processes described by the balance equations for electron probability density functions (electron pdf) coupled to the time dynamics waves (quasi-particles) in a quantum process of their resonant interaction. Such description results in a Mean Field model where diffusion coefficients are determined by the local spectral energy density of excited waves whose perturbations depend on flux averages of the electron pdf. We will discuss the model and a mean field iteration scheme that simulates the dynamics of the space average model, where the energy spectrum of the excited wave time dynamics is calculated with a coefficient that depends on the electron pdf flux at a previous time step; while the time dynamics of the quasilinear model for the electron pdf is calculated by the spectral average of the quasi-particle wave under a classical resonant condition where the plasma wave frequencies couples the spectral energy to the momentum variable of the electron pdf. Recent numerical simulations will be presented showing a strong hot tail an isotropy formation and stabilization for the iteration in a 3 dimensional cylindrical model.

uk: вхід без авторизації

name: Quasilinear diffusion of magnetized fast electrons in a mean field of quasi-particle waves packets


keywords:
particle-in-cell
mimetic finite differences
structure-preserving numerics

uk: Математика, природничі науки

description: A kinetic description of a plasma in external and self-consistent fields is given by the Vlasov equation for the particle distribution functions coupled to Maxwell's equation. Numerical schemes that preserve the structure of the kinetic equations can provide new insights into the long time behavior of fusion plasmas. In this talk, I will present a structure-preserving particle-in-cell scheme for the Vlasov-Maxwell equations based on a finite difference description of the fields. Moreover, I will discuss the parallel implementation of this method based on the AMReX framework.

uk: вхід без авторизації

name: A geometric electromagnetic Particle in Cell method on staggered grids


uk: Математика, природничі науки

description: Leveraging the existence of a hidden low-rank structure hinted by the diffusive limit, in this work, we design and test an angular space reduced order model for the linear radiative transfer equation based on reduced basis methods (RBMs). Our algorithm is built upon a high-fidelity solver employing the discrete ordinates method in the angular space, an upwind discontinuous Galerkin method for the physical space, with an efficient synthetic accelerated source iteration for the resulting linear system. Strategies are particularly proposed to tackle the challenges associated with the scattering operator within the RBM framework.

uk: вхід без авторизації

name: A reduced basis method for radiative transfer equation


keywords:
Ising model
random maps
triangulations

uk: Математика, природничі науки

description: In this talk, I will present recent results, obtained in collaboration with Laurent Ménard, about the geometry of spin clusters in Ising-decorated triangulations, and build on previously work obtained in collaboration with Laurent Ménard and Gilles Schaeffer. In this model, triangulations are sampled together with a spin configuration on their vertices, with a probability biased by their number of monochromatic edges, via a parameter nu. The fact that there exists a combinatorial critical value for this model has been initially established in the physics literature by Kazakov and was rederived by combinatorial methods by Bousquet-Mélou and Schaeffer, and Bouttier, Di Francesco and Guitter. Here, we give geometric evidence of that this model undergoes a phase transition by studying the volume and perimeter of its monochromatic clusters. In particular, we establish that, when nu is critical or subcritical, the cluster of the root is finite almost surely, and is infinite with positive probability for nu supercritical.

uk: вхід без авторизації

name: Geometry of the sign clusters in the Infinite Ising-weighted triangulation

name: Centre International de Rencontres Mathématiques (CIRM)


keywords:
permutations
permutons
stochastic differential equations
universal phenomena
Liouville quantum gravity
SLE curves

uk: Математика, природничі науки

description: Consider a large random permutation satisfying some constraints or biased according to some statistics. What does it look like? In this seminar we make sense of this question introducing the notion of permuton. Permuton convergence has been established for several models of random permutations in various works: we give an overview of some of these results, mainly focusing on the case of pattern-avoiding permutations. The main goal of the talk is to present a new family of universal limiting permutons, called skew Brownian permuton. This family includes (as particular cases) some already studied limiting permutons, such as the biased Brownian separable permuton and the Baxter permuton. We also show that some natural families of random constrained permutations converge to some new instances of the skew Brownian permuton. The construction of these new limiting objects will lead us to investigate an intriguing connection with some perturbed versions of the Tanaka SDE and the SDEs encoding skew Brownian motions. We finally explain how it is possible to construct these new limiting permutons directly from a Liouville quantum gravity decorated with two SLE curves. Building on the latter connection, we compute the density of the intensity measure of the Baxter permuton.

uk: вхід без авторизації

name: The skew Brownian permuton: a new universal limit for random constrained permutations and its connections with Liouville quantum gravity


keywords:
maps
Brownian disk
Gromov-Hausdorff

uk: Математика, природничі науки

description: The main purpose of this work is to provide a framework for proving that, given a family of random maps known to converge in the Gromov--Hausdorff sense, then some (suitable) conditional families of random maps converge to the same limit. As a proof of concept, we show that quadrangulations with a simple boundary converge to the Brownian disk. More precisely, we fix a sequence of even positive integers with for some. Then, for the Gromov--Hausdorff topology, a quadrangulation with a simple boundary uniformly sampled among those with inner faces and boundary length weakly converges, in the usual scaling , toward the Brownian disk of perimeter.

uk: вхід без авторизації

name: Nonbijective scaling limit of maps via restriction


keywords:
enumerative combinatorics
bijective combinatorics
combinatorial maps
non-oriented surfaces
blossoming tree

uk: Математика, природничі науки

description: Bijections between planar maps and tree-like structures have been proven to play a crucial role in understanding the geometry of large random planar maps. Perhaps the most popular (and useful) bijections fit into two categories: bijections between maps and labeled trees and bijections between maps and blossoming trees. They were popularized in the late nineties in the important contribution of Schaeffer and they have been widely developed since then. It is natural to ask whether these bijections still hold when the underlying surface is no longer the sphere but any two-dimensional compact manifold? In this case trees are replaced by maps on a given surface with only one face and while the construction of Schaefer of the labeled-type bijection works independently on genus (but crucially depending on the assumption of orientability) his construction of the blossoming-type bijection was known only in the planar case. We will discuss a (recent?) development of these bijections that extends them to all compact two-dimensional manifolds. I will quickly review my previous joint work with Chapuy and its extension due to Bettinelli which treats the labeled-type bijection and will focus on a more recent work joint with Lepoutre which extends the blossoming-type bijection to non-oriented surfaces.

uk: вхід без авторизації

name: Bijections for maps on non-oriented surfaces


keywords:
large genus
random maps
hyperbolic surfaces

uk: Математика, природничі науки

description: In the past few years, the study of the geometric properties of random maps has been extended to a new regime, the 'high genus regime', where we are interested in maps whose size and genus tend to infinity at the same time, at the same rate. We consider here a slightly different case, where the genus also tends to infinity, but less rapidly than the size, and we study the law of simple cycles (with a well-chosen rescaling of the graph distance) in unicellular maps (maps with one face), thanks to a powerful bijection of Chapuy, Féray and Fusy. The interest of this work is that we obtain exactly the same law as Mirzakhani and Petri who counted closed geodesics on a model of random hyperbolic surfaces in large genus (the Weil- Petersson measure). This leads us to conjecture that these two models are somehow 'the same' in the limit.

uk: вхід без авторизації

name: Unicellular maps vs hyperbolic surfaces in high genus


Random hyperbolic surfaces

keywords:
Weil-Petersson volumes
Brownian sphere
random trees

uk: Математика, природничі науки

description: Going back at least to the works of Witten and Kontsevich, it is known that (symplectic or Weil-Petersson) volumes of moduli spaces of Riemann surfaces share many features with the enumeration of maps. It is therefore natural to expect that the theory of random hyperbolic metrics sampled according to the Weil-Petersson measure on, say, punctured spheres is closely related to the theory of random planar maps. I will highlight some similarities and show that tree bijections, which are ubiquitous in the study of random planar maps, have analogues for hyperbolic surfaces. As an application, jointly with Nicolas Curien, we show that these random hyperbolic surfaces with properly rescaled metric admit a scaling limit towards the Brownian sphere when the number of punctures increases.

uk: вхід без авторизації


keywords:
planar maps
scaling limit
Gaussian process

uk: Математика, природничі науки

description: In this talk we consider large Boltzmann stable planar maps of index , We will show that this model converges in the scaling limit towards a random compact metric space that we construct explicitly. We will also present some results concerning the topology and the geodesics of the scaling limit. This talk is based on a joint work with Nicolas Curien and Grégory Miermont.

uk: вхід без авторизації

name: The scaling limit of random planar maps with large faces


Multicritical Schur measures

keywords:
random partitions
Schur measures
random matrices

uk: Математика, природничі науки

description: Schur measures are random integer partitions, that map to determinantal point processes. We explain how to construct such measures whose edge behavior (asymptotic distribution of the largest parts) is governed by a higher-order analogue of the Airy ensemble/Tracy-Widom GUE distribution. This 'multicritical' analogue was previously encountered in models of fermions in non-harmonic traps, considered by Le Doussal, Majumdar and Schehr. These authors noted a coincidental connection with unitary random matrix models, which our construction explains via an exact mapping. This part is based on joint work with Dan Betea and Harriet Walsh. If time allows, I will hint at a possible generalization that would correspond to a unitary analogue of the Ambjørn-Budd-Makeenko hermitian one-matrix model. This is work in progress.

uk: вхід без авторизації


uk: Математика, природничі науки

description: In this talk I will provide a brief and gentle introduction to Witten's conjecture, which predicts that the generating series of certain intersection numbers on the moduli space of curves is a tau function of the KdV integrable hierarchy, as a motivation for r-spin Witten's conjecture that concerns much more complicated geometric objects and specialises to the original conjecture for r=2. The r=2 conjecture was proved for the first time by Kontsevich making use of maps arising from a cubic hermitian matrix model with an external field. Together with R. Belliard, S. Charbonnier and B. Eynard, we studied the combinatorial model that generalises Kontsevich maps to higher r. Making use of some auxiliary models we manage to find a Tutte-like recursion for these maps and to massage it into a topological recursion. We also show a relation between a particular case of our maps and the r-spin intersection numbers, which allows us to prove that these satisfy topological recursion. Finally, I will explain how, in joint work with G. Borot and S. Charbonnier, we relate another specialisation of our models to fully simple maps, and how this identification helps us prove that fully simple maps satisfy topological recursion for the spectral curve in which one exchanges x and y from the spectral curve for ordinary maps. This solved a conjecture from G. Borot and myself from '17.

uk: вхід без авторизації

name: Generalised Kontsevich graphs, topological recursion and r-spin intersection numbers


keywords:
free cumulants
combinatorics
Hurwitz numbers
asymptotic expansion
random matrices

uk: Математика, природничі науки

description: I will talk about a transformation involving double monotone Hurwitz numbers, which has several interpretations: transformation from maps to fully simple maps, passing from cumulants to free cumulants in free probability, action of an operator in the Fock space, symplectic exchange in topological recursion. In combination with recent work of Bychkov, Dunin-Barkowski, Kazarian and Shadrin, we deduce functional relations relating the generating series of higher order cumulants and free cumulants. This solves a 15-year old problem posed by Collins, Mingo, Sniady and Speicher (the first order is Voiculescu R-transform). This leads us to a general theory of 'surfaced' freeness, which captures the all order asymptotic expansions in unitary invariant random matrix models, which can be described both from the combinatorial and the analytic perspective.

uk: вхід без авторизації

name: Maps, Hurwitz numbers and formulas for free probability at all genera


keywords:
conformal field theory
Gaussian multiplicative chaos
conformal blocks

uk: Математика, природничі науки

description: Liouville CFT is a conformal field theory developped in the early 80s in physics, it describes random surfaces and more precisely random Riemannian metrics on surfaces. We will explain, using the Gaussian multiplicative chaos, how to associate to each surface with boundary an amplitude, which is an function on the space of fields on the boundary of (i.e. the Sobolev space equipped with a Gaussian measure, if the boundary of has connected components), and then how these amplitudes compose under gluing of surfaces along their boundary (the so-called Segal axioms). This allows us to give formulas for all partition and correlation functions of the Liouville CFT in terms of point correlation functions on the Riemann sphere (DOZZ formula) and the conformal blocks, which are holomorphic functions of the moduli of the space of Riemann surfaces with marked points. This gives a link between the probabilistic approach and the representation theory approach for CFTs, and a mathematical construction and resolution of an important non-rational conformal field theory. This is joint work with A. Kupiainen, R. Rhodes and V. Vargas.

uk: вхід без авторизації

name: Resolution of Liouville CFT : Segal axioms and bootstrap


Growing maps face by face

uk: Математика, природничі науки

description: In this talk, based on joint work with Alexandre Stauffer, I will consider the problem of providing 'uniform growth schemes' for various types of planar maps. In particular, we will discuss how to couple a uniform map with n faces with a uniform map with n+1 faces in such a way that the smaller map is always obtained from the larger by collapsing a single face. We show that uniform growth schemes exist for rooted 2p-angulations of the sphere and for rooted simple triangulations.

uk: вхід без авторизації


Height coupled trees

keywords:
random trees
local limit
height dependent weights

uk: Математика, природничі науки

uk: вхід без авторизації


keywords:
random maps
high-genus maps
Brownian maps
Voronoï diagrams
bijections
trisections

uk: Математика, природничі науки

description: Several operations of combinatorial surgery can be used to relate maps of a given genus g to maps of genus g' is smaller than g. One of them is the Tutte/Lehman-Walsh decomposition, but more advanced constructions exist in the combinatorial toolbox, based on the Marcus-Schaeffer/ Miermont or the trisection bijections. At the asymptotic level, these constructions lead to surprising relations between the enumeration of maps of genus g, and the genus 0 Brownian map. I will talk about some fascinating identities and (open) problems resulting from these connections, related to Voronoi diagrams, 'W-functionals', and properties of the ISE measure. Although the motivation comes from 'higher genus', these questions deal with the usual Brownian map as everyone likes it. This is not very new material, and a (mostly French) part of the audience may have heard these stories one million times. But still I hope it will be interesting to advertise them here. In particular, I do not know if recent 'Liouville-based' approaches have anything to say about all this.

uk: вхід без авторизації

name: Some questions on the Brownian Map motivated by its higher-genus analogues


Aléa, automates et transcendance

uk: Математика, природничі науки

uk: вхід без авторизації


keywords:
symbolic dynamics
aperiodicity
Lovász local lemma

uk: Математика, природничі науки

description: Subshifts are set of colorings of a group by a finite alphabet that respect local constraints, given by some forbidden patterns ode m. The asymmetric version of Lovász local lemma reveals particularly useful to prove the existence of a coloring inside a subshift, i.e. a coloring that avoids all the forbidden patterns. In this talk I will present some sufficient conditions on the set of forbidden patterns to get at least one coloring. Then we will see as an application why every group possesses a strongly aperiodic subshift.

uk: вхід без авторизації

name: Subshifts, the emptiness problem and Lovász local lemma


keywords:
Random graphs
Gromov-Hausdorff distance
scaling limits
continuum random tree

uk: Математика, природничі науки

description: In the last 30 years, random combinatorial structures and their scaling limits have formed a flourishing area of research at the interface between probability and combinatorics. In this mini-course, I aim to show some of the beautiful theory that arises when considering scaling limits of random trees and graphs. Trees are fundamental objects in combinatorics and the enumeration of different classes of trees is a classical subject. In the first section, we will take as our basic object the genealogical tree of a critical Bienaymé-Galton-Watson branching process. (As well as having nice probabilistic properties, this class turns out to include various natural types of random combinatorial tree in disguise.) In the same way as Brownian motion is the universal scaling limit for centred random walks of finite step-size variance, it turns out that all critical Bienaymé-Galton-Watson trees with finite offspring variance have a universal scaling limit, Aldous' Brownian continuum random tree. The simplest model of a random network is the Erdôs-Rényi random graph : we take vertices, and include each possible edge independently with probability . One of the most well-known features of this model is that it undergoes a phase transition. Take . Then for , the components have size , whereas for , there is a giant component, comprising a positive fraction of the vertices, and a collection of components of size . (These statements hold with probability tending to 1 as .) In the second section, we will focus on the critical setting, , where the largest components have size of order , and are "close" to being trees, in the sense that they have only finitely many more edges than a tree with the same number of vertices would have. We will see how to use a careful comparison with a branching process in order to derive the scaling limit of the critical Erdôs-Rényi random graph. The rapidly growing field of analytic combinatorics in several variables uses tools from complex analysis, algebraic geometry, topology, and computer algebra to characterize the asymptotic properties of sequences defined by multivariate generating functions. This course will survey some of the methods in the field, with a focus on explicit results that can be used in applications across a variety of mathematical and scientific domains.

uk: вхід без авторизації

name: Scaling limits of random trees and graphs - Lecture 1


keywords:
Bradley-Terry model
adaptive link prediction
sequential matching parison

uk: Математика, природничі науки

description: I'll present two problems where data naturally present a graphical structure: the analysis of champions in a tournament and the problem of matching. I'll present for each problem intuitive results in toy models and discuss various mathematical tools involved to prove them. I'll also present many open problems, hopefully convincing people to jump in this growing area.

uk: вхід без авторизації

name: Some phase transition phenomena in graphical data analysis


uk: Математика, природничі науки

uk: вхід без авторизації

name: Scaling limits of random trees and graphs - Lecture 2


name: Institut für Ökologie der Universität Innsbruck

keywords:
Artenkenntnis
Bestimmung
Biodiversität
Biologie
Brauchtum
Citizen Science
Endemismus
Evolution
Fauna
Gefährdung
Mitteleuropa
Nahrungsmittel
Naturschutz
Neozoa
Ökologie
Österreich
Tirol
Verhalten
Vielfalt
Wildtiere
Biologische Invasion

de: Biologie

uk: Біологія

en: Biology

uk: Математика, природничі науки

description: Von ExpertInnen verfasste, interaktive Steckbriefe zu 250 Tierarten Tirols ermöglichen deren Bestimmung und bieten Fakten zu Größe, Höhenverbreitung, Habitat, Entwicklung, Ernährung und Schutzstatus sowie ausgewählte „Gschichtln“ – faszinierende Details, die einen emotionalen Zugang zu den Arten ermöglichen.

encodingFormat: application/pdf

@language: de

uk: вхід без авторизації

name: Tierökologie-Zertifikat: Arten Tirols – Steckbriefe zur Stufe 1

Universität Innsbruck

addressCountry: AT

addressLocality: Innsbruck

addressRegion: Tyrol

cs: Pracovní list

de: Arbeitsmaterial

fi: Työarkki

uk: Робочий матеріал

en: Worksheet

fr: Feuille de Travail


Starbucks: Integrationsfallstudie

ZHAW

addressCountry: CH

addressLocality: Winterthur

addressRegion: Zurich

keywords:
Strategiekonzepte
Marketingkonzepte
Vernetztes Denken
Entscheidungsfindung
Managementkreislauf

de: Betriebswirtschaftslehre

uk: Бізнес-адміністрування

en: Business Administration

de: Rechts-, Wirtschafts- und Sozialwissenschaften

uk: Право, економіка та суспільні науки

en: Law, Economics and Social Sciences

de: Wirtschaftswissenschaften

uk: Бізнес та економіка

en: Business and Economics

description: Kaffee ist - neben Wasser – einer der bedeutendsten Rohstoffe im Ernährungsbereich und wird in den letzten Jahren und Jahrzehnten von immer mehr Anbietern entdeckt und mit innovativen Konzepten bespielt. Einen ähnlichen Erfolg wie Starbucks im Kaffeehausbereich hat die Schweizer Firma Nestlé mit Ihrem in der Zwischenzeit oft kopierten Nespresso Kapselsystem. Da mit zunehmender Marktdurchdringung für Starbucks und Nestlé zusätzliches Marktwachstum immer schwieriger wird, kommen sich die beiden Firmen immer näher. Die vorliegende Fallstudie beleuchtet diverse strategische und marketingmässige Fragen rund um die Firma Starbucks. Anzahl Seiten: 54

uk: вхід без авторизації

cs: Případová studie

de: Fallstudie

fi: Tapaustutkimus

uk: Приклад

en: Case Study

fr: Étude de Cas

da: Casestudie

nl: Case Study

es: Estudio de Caso


keywords: Stakeholderanalyse Kommunikationsmanagement Medienkommunikation Öffentlichkeitsarbeit Krisenkommunikation

uk: Бізнес та економіка

de: Kommunikationswissenschaft/Publizistik

uk: Соціальні комунікації/Журналістика

en: Communication Science/Journalism

uk: Право, економіка та суспільні науки

description: Im Sinne des Qualitätsmanagements müssen sich Schulen im Kanton Solothurn externen Evaluationen unterziehen. Der Evaluationsbericht der Primarschule Hägendorf zeigte 2015 diverse Mängel auf, wurde jedoch nicht aktiv allen Stakeholdern kommuniziert, was zu grosser Kritik bis hin zu einer folgenreichen Eskalation führte. Die vorliegende Fallstudie dient im Rahmen von Führungsschulungen der Einführung ins strategische Kommunikationsmanagement. Anzahl Seiten: 32

uk: вхід без авторизації

name: Primarschule Hägendorf: Interne und externe Kommunikation im Bildungswesen

Fachhochschule Nordwestschweiz

addressLocality: Windisch

addressRegion: Aargau


keywords:
Wirtschaftskommunikation
Referendumsabstimmung
Politische Kommunikation

uk: Бізнес та економіка

uk: Право, економіка та суспільні науки

description: Florian Traub, «Bachelor of Science in Betriebsökonomie», kauft sich 2015 mit 51% in das Familienunternehmen «Workplace» (50 Mitarbeitende) ein und übernimmt diese im Wirtschaftsraum Basel («Winterberg») gelegene Firma als Geschäftsführer. Obwohl «Workplace» verschuldet ist, sieht er Entwicklungspotenzial. Neben anderen betriebswirtschaftlichen Massnahmen sucht er für 80% des «Workplace» – Gewerbeareals (25'000 m2) eine Lösung auf politischer Ebene. In Abstimmung und mit Unterstützung des Gemeinderates gelingt es ihm, die Abstimmung über den «Quartierplan Workplace» zu gewinnen, die Gemeindeversammlung heisst die Umzonung des Gewerbegebietes in eine Wohnzone gut. («Die Vorgeschichte bis Juni 2015») Es kommt aber überraschend zu einem Referendum, wodurch sein Sanierungsplan in Frage gestellt wird. («Das Referendum im Juli 2015») Damit entscheidet eine Referendumsabstimmung über die Zukunft der Firma. («Der Countdown bis zum 27. November 2015 läuft») Anzahl Seiten: 22

uk: вхід без авторизації

name: «Wie weiter in Winterberg?»: Ein Unternehmen am Abgrund : Fallstudie Wirtschaftskommunikation


Audrey Fashion enters China

keywords:
Intercultural communication
Hospitality
Relationship building

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: The case study provides students with an opportunity to discuss and analyse the similarities and differences of working styles in China and Switzerland using a structured framework. There are several key intercultural themes to explore and students see an example of a real dilemma where a business person is placed outside of their usual everyday routine. Anzahl Seiten: 19

uk: вхід без авторизації


keywords:
Finanzmanagement
Rechnungslegung nach OR
Jahresabschluss
Finanzanalyse

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Die vor 40 Jahren gegründete Müller Bau AG hat sich regional einen guten Namen gemacht. Der Patron steht kurz vor der Pensionierung und gibt die Führung an seinen Sohn ab. Dieser soll den Finanzbereich übernehmen. Dabei soll der Jahresabschluss auf Vollständigkeit und Rechtskonformität geprüft werden. Ebenso soll aufgrund der vorliegenden Informationen eine finanzielle Analyse vorgenommen werden, welche Problembereiche in der Unternehmensführung aufzeigt. Anzahl Seiten: 25 ISSN: 2673-4737

uk: вхід без авторизації

name: Fallstudie Müller Bau AG: Führung mit Finanzen in der Baubranche


keywords:
Pensionskasse
Berufliche Vorsorge
Altersvorsorge
Technischer Zinssatz
Umwandlungssatz

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Langlebigkeit und tiefe Kapitalmarktzinsen verschärfen die Situation von Pensionskassen. Diese müssen sich den geänderten Rahmenbedingungen anpassen, um ihre finanzielle Stabilität nicht zu verlieren und um systematische Umverteilungen von aktiven Arbeitnehmenden zu Rentnern zu vermeiden. Die vorliegende Fallstudie zeigt am Beispiel einer schweizerischen Pensionskasse die Mechanismen und die gegenseitige Abhängigkeit von versicherungstechnischen Parametern und deren Komplexität in der Umsetzung. Anzahl Seiten: 25

uk: вхід без авторизації

name: Pensionskasse Sorglos (PKS):  Anpassung der versicherungstechnischen Parameter an die veränderten Umweltbedingungen


Hochschule Luzern

addressLocality: Lucerne

addressRegion: Lucerne

keywords:
hospitality
hospitableness
tourism
conceptual framework

de: Tourismuswirtschaft

uk: Туристичний менеджмент

en: Tourism Management

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: The concept of hospitality has a long history and the term has been used for both the act of being hospitable as well as for services offered by the hotel and tourism industry. Many researchers have developed definitions and models of hospitality. However, there is still a lack of agreement of what hospitality per se really is. In the context of the 200-year anniversary of tourism in Central Switzerland and a corresponding research project, the current state of literature has been analysed and is presented in this paper. The paper suggests a conceptual framework of hospitality in tourism as a general basis for empirical research in this field and to describe and compare levels of hospitality to develop this framework. The framework reflects the fact that hospitality requires a broad discussion and takes place in multiple social contexts. Employees of the tourism industry as well as the host community both influence the hospitality experience of guests. To gain deeper insights into the topic of hospitality, qualitative and quantitative studies have been conducted. The main results of these studies are presented in this paper. Anzahl Seiten: 72 ISSN: 2673-4737

uk: вхід без авторизації

name: Understanding Hospitality - Results of a Literature Analysis and Empirical Studies


Multimodale Texte fürs Web

keywords:
Online-Kommunikation
Suchmaschinengerechtes Schreiben
SEO
Online Redaktion
Webtexte

uk: Бізнес та економіка

uk: Соціальні комунікації/Журналістика

uk: Право, економіка та суспільні науки

description: Die Publikation von Texten im Web ist mittlerweile zum Standard geworden. Dabei können Schreibstrategien von Printtexten nicht einfach auf Webtexte übertragen werden. Es gilt, kanal-, medien- und lesergerechte Schreibstrategien zu entwickeln. Dieses Skript soll Studierende dazu befähigen die Besonderheiten des Web als Publikationskanal zu verstehen und Fachwissen medien- und kanalgerecht aufzubereiten. Zunächst werden Grundlagen zu Websites als multimodale Texte vermittelt. Danach wird auf Informationsstrukturen eingegangen. Die Informationsarchitektur, Navigation, Links, Titel und Teaser bilden den Schwerpunkt dieses Kapitels. Der nächste Abschnitt ist einer Auswahl von unterschiedlichen Textsorten im Web gewidmet. Da Bilder im Web besonders zentral sind, stellen Bildtypen und Bildanalyse weitere Schwerpunkte dar. Textoptimierung für Suchmaschinen und Online-Konzept und Redaktion bilden die beiden theoretischen Schlusskapitel. Schliesslich runden Übungen zu den einzelnen Kapiteln das Gelernte ab. Anzahl Seiten: 71

uk: вхід без авторизації

cs: Skripta

de: Skript

fi: Käsikirjoitus

uk: Запис

en: Script

fr: Script

da: Script

nl: Script

es: Script

cs: Cvičení

de: Übung

fi: Harjoitus

uk: Практика

en: Drill and Practice

fr: Apprentissage par Répétition

da: Øvelse

nl: Oefenen

es: Práctica


keywords:
Analytisches Marketing
Strategisches Marketing
Marketing-Mix

uk: Бізнес та економіка

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

description: Der Fall KURATLE JACKER AG – Fallstudie Marketingkonzept Schleifmittel 2017 bis 2021 befasst sich mit der dem Unternehmen bevorstehenden Aufgabe der Einführung und Marktdurchdringung der Produktgruppe Schleifmittel im Schweizer B2B und B2C Markt. Er beschreibt die Ausgangslage des erfolgreichen Familienunternehmens, dessen Anspruch der verantwortungsvolle Umgang mit dem natürlichen und nachwachsenden Rohstoff Holz ist. Der Fall bietet die Grundlage, ein Marketingkonzept für die Produktgruppe Schleifmittel zu entwerfen inkl. Analyse, strategischem Vorgehen, Marketing-Mix und Implementierung. Anzahl Seiten: 45

uk: вхід без авторизації

name: Kuratle Jaecker AG:  Fallstudie Marketingkonzept Schleifmittel 2017 bis 2021


keywords:
Recht
Ziviles Wirtschaftsrecht
Arbeitsrecht
Arbeitsvertragsrecht
Kündigung
Änderungskündigung

uk: Бізнес-адміністрування

de: Rechtswissenschaften

uk: Правознавство

en: Law

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Diese Aufgabensammlung (mit Lösungshinweisen) behandelt anhand von Fragen und Aufgaben zu einem wirtschaftsorientierten Sachverhalt systematisch die wichtigsten Grundlagen des für die Managementpraxis zentralen rechtlichen Themas der Kündigung, insbesondere der Änderungskündigung, im Arbeitsvertragsrecht. Sie dient der selbständigen Anwendung und Vertiefung von Basiskenntnissen im schweizerischen zivilen Wirtschaftsrecht (BA Business Administration). Anzahl Seiten: 30

uk: вхід без авторизації

name: Take it or Leave it: Fallbasierte juristische Aufgabensammlung


keywords:
Recht
ziviles Wirtschaftsrecht
Gesellschaftsrecht
Aktienrecht
AG
GmbH

uk: Правознавство

uk: Право, економіка та суспільні науки

description: Diese Aufgabensammlung (mit Lösungshinweisen) behandelt anhand von Fragen und Aufgaben zu einem wirtschaftsorientierten Sachverhalt systematisch ausgewählte, für die Managementpraxis wichtige Grundlagen des Gesellschafts- und insbesondere des Aktien- und GmbH-Rechts. Sie dient der selbständigen Anwendung und Vertiefung von Basiskenntnissen im schweizerischen zivilen Wirtschaftsrecht (BA Business Administration). Anzahl Seiten: 31

uk: вхід без авторизації

name: Smart Domestic Cleaner: Fallbasierte juristische Aufgabensammlung


keywords:
Recht
Ziviles Wirtschaftsrecht
Haftpflichtrecht
Haftung
Deliktshaftung

uk: Правознавство

uk: Право, економіка та суспільні науки

description: Diese Aufgabensammlung (mit Lösungshinweisen) behandelt anhand von Fragen und Aufgaben zu einem wirtschaftsorientierten Sachverhalt systematisch die wichtigsten Grundlagen des für die Managementpraxis relevanten vertraglichen und ausservertraglichen Haftpflichtrechts. Sie dient der selbständigen Anwendung und Vertiefung von Basiskenntnissen im schweizerischen zivilen Wirtschaftsrecht (BA Business Administration). Anzahl Seiten: 42

uk: вхід без авторизації

name: Eigentlich wollte Schurter nur einen Znüni kaufen ...: Fallbasierte juristische Aufgabensammlung


keywords:
Recht
Ziviles Wirtschaftsrecht
Obligationenrecht
OR AT
Vertragsverletzung

uk: Правознавство

uk: Право, економіка та суспільні науки

description: Diese Aufgabensammlung (mit Lösungshinweisen) behandelt anhand von Fragen und Aufgaben zu einem wirtschaftsorientierten Sachverhalt systematisch die wichtigsten Grundlagen des für die Managementpraxis zentralen rechtlichen Themas der Vertragsverletzung (Art. 102-109 OR). Sie dient der selbständigen Anwendung und Vertiefung von Basiskenntnissen im schweizerischen zivilen Wirtschaftsrecht (BA Business Administration). Anzahl Seiten: 25

uk: вхід без авторизації

name: Crypto Mania Fallbasierte juristische Aufgabensammlung


keywords:
Marketing Grundlagen
Fallstudien Marketing
Marketingkonzept
Marketingkonzeption

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Grundlagen des Marketings werden in betriebswirtschaftlichen Aus- und Weiterbildungen oft entlang der Marketingkonzeption vermittelt (vgl. Schürmann (2016)). Acht einfache Unternehmensbeispiele mit Fragen und Lösungsvorschlägen sollen die Lernenden dazu anleiten, ihr theoretisch-konzeptionelles Wissen zu vertiefen und so ihren Lernfortschritt zu überprüfen. Anzahl Seiten: 47 ISSN: 2673-4737

uk: вхід без авторизації

name: Angewandte Lernkontrolle zum Marketingkonzept: 8 kurze Fälle mit Aufgaben und Lösungsvorschlägen


keywords:
Strategisches Management
Brand Management
Identity Management
Integrierte Unternehmenskommunikation

uk: Бізнес та економіка

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

description: Angesichts des drohenden Wegfalls eines Ankermieters und des digitalen Wandels in der Musik- und Eventbranche prüft das Hallenstadion Zürich eine Neupositionierung. Zur Diskussion steht eine Weiterentwicklung des Geschäftsmodells: vom Logistikpartner für Konzerte und Events hin zum Veranstalter. Was bedeutet dies für das Unternehmen, die Marke und die Kommunikation des Hallenstadions? Anzahl Seiten: 42

uk: вхід без авторизації

name: Neupositionierung des Zürcher Hallenstadions


Goldtimer-Exposition

keywords: Finanzmanagement Kulturbereich Museen

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Im Januar 2018 tritt Andi Parker die Direktoriumsstelle der Stiftung Historisches Museum Oberberg (SHMO) an. Andi Parker leitet zugleich die Oldtimerabteilung dieses Museums. Im Herbst 2019 soll diese mit der Goldtimer-Exposition zusätzliche Besuchende anlocken. Die Exposition soll für das Museum ergebnisverbessernd durchgeführt werden. Welche Instrumente und Konzepte helfen, diese Zielsetzung zu erreichen? Anzahl Seiten: 26

uk: вхід без авторизації


keywords:
behavior finance
herd behavior
regressional analysis
SMI

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: This case task is constructed for Bachelor students in Business Administration/International Management with advanced finance and econometrics knowledge to practice the application of a regression analysis in testing behavioral finance concepts. In particular, the case task tests for the existence of herd behavior by applying the regression model of Chang et al. (2000) in the case of the Swiss stock market in the period March 2016 – April 2019 by using publicly available daily stock price data and the Stata software. Anzahl Seiten: 61

uk: вхід без авторизації

name: Testing for Herd Behavior in the Swiss Stock Market


IU Internationale Hochschule

addressCountry: DE

addressLocality: Erfurt

addressRegion: Thuringia

keywords:
marketing strategy
chocolate industry
segmentation
market entry
consumer behavior

uk: Бізнес-адміністрування

de: Intern. Betriebswirtschaft/Management

uk: Міжнародний бізнес/Менеджмент

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: By the end of 2016, Gustavo Pradilla, CEO of Chocolate Tibitó, was contemplating his company’s future from his office in Bogotá Colombia. He was wondering how to promote his chocolate brand in Europe, considering his company’s limited resources for marketing campaigns. A small firm, with a sales volume of approximately 100.000 Euros, Tibitó produced high quality, fair trade chocolate, made of Colombian beans and sold 100% of its production to the local market. Although sales have been increasing in Colombia, international recognition, and the need to increase the plant production had given Gustavo the idea of selling the bars abroad, particularly in Germany. Nevertheless, Tibitó’s founder was not sure if it was possible to grow in the German market with limited marketing campaigns. Even more so considering that he was pretending to sell a chocolate from an unknown origin in Germany and at a much higher price than the local mainstream chocolate brands. Tibitó only had limited budget, staff and expertise to advertise in Germany and therefore, Gustavo considered it challenging for his small company, to make a significant investment in advertising. The case covers different marketing strategy elements, e.g. SWOT analysis, online versus offline marketing and positioning. Anzahl Seiten: 33

uk: вхід без авторизації

name: Chocolate Tibitó: Is Germany ready for premium Colombian Chocolate?


keywords:
Beziehung und Vertrauen
Menschen und Probleme
Interessen
Mentale Vorbereitung

uk: Бізнес та економіка

uk: Соціальні комунікації/Журналістика

uk: Право, економіка та суспільні науки

description: Das Fallbeispiel beschreibt, wie eine vermeintlich stabile Geschäftsbeziehung aufgrund eines neuen Ansprechpartners (mit wesentlichen Entscheidungsbefugnissen) unerwartet eine unsichere Perspektive erhält. Die bedrohlich wirkende Ausgangslage ist zugleich ein geeigneter Nährboden, um eigene Befürchtungen auf andere zu übertragen. Allein auf der Basis einer neu aufzubauenden vertrauensvollen Beziehung besteht die Möglichkeit, die gemeinsamen geschäftlichen Aktivitäten fortzusetzen, und das setzt eine gezielte mentale Gesprächsvorbereitung voraus. Aus methodischer Sicht geht es insbesondere auch darum zu erkennen und aufzuzeigen, wie sich vorliegende Sachverhalte und persönliche Befindlichkeiten trennen und wie sich die hinter einer eingenommenen Position liegenden Interessen (Beweggründe) aufdecken lassen. Anzahl Seiten: 14 ISSN: 2673-4737

uk: вхід без авторизації

name: Ein neuer Ansprechpartner: Fallbasierte Aufgabensammlung


keywords: Betriebswirtschaft Strategisches-Management SWOT-Analyse Unternehmensziele

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Schweizer Mikrounternehmen haben bis zu neun Angestellte. Mikrounternehmer und Mikrounternehmerinnen arbeiten durchschnittlich bis zu 11 Stunden täglich. Sie sind durch die langen Arbeitszeiten exponentiell höher gefährdet an einer Überlastungsdepression – im Volksmund auch Burnout genannt - zu erkranken, als Angestellte oder Arbeitgeber von mittelständigen Unternehmen. Um eine längerfristige, gesundheitsbedingte Arbeitsunfähigkeit von Mikrounternehmern und Mikroinhaberinnen erfolgreich zu bewältigen, wurden von dem Verein «Four Balance» Dienstleistungen entwickelt. Die Studierenden der Bachelor Studiengänge Betriebsökonomie und Wirtschaftsinformatik sollen die Modelle des Strategischen Managements auf die Fallstudie «Four Balance» anwenden. Anzahl Seiten: 27

uk: вхід без авторизації

name: Four Balance: Dienstleistungen für krankgewordene MikrounternehmerInnen


keywords:
Prozessmanagement
Operationsmanagement
Internationalisierung
Lean Management
Make-Or-Buy
Offshoring

uk: Бізнес-адміністрування

de: Interdisziplin. Studien (Schwerpunkt Rechts-, Wirtschafts- und Sozialwissenschaften)

uk: Міждисциплінарні дослідження(у галізях юрид., екон. та сусп. наук)

en: Interdisc. St. (spec. in Law, Econ. and Soc. Sci.)

uk: Право, економіка та суспільні науки

de: Rechts-, Wirtschafts- und Sozialwissenschaften allgemein

uk: Право, економіка та суспільні науки

en: Law, Economics and Social Sciences (general)

uk: Бізнес та економіка

description: Eine fundierte Einführung in das strategische und operative Management von Unternehmensprozessen ist eine wichtige Grundlage für Studierende, die Unternehmen im globalen Wettbewerb erfolgreich positionieren möchten. Zwei einfache Fallstudien mit je drei Teilaufgaben leiten die Studierenden an, ihr theoretisches Wissen zu vertiefen. Sie dienen als Ergänzung zur Literatur von Waser und Peter (2016). Anzahl Seiten: 25 ISSN: 2673-4737

uk: вхід без авторизації

name: Angewandte Fallstudien zu Prozess- und Operations-Management


keywords:
Strategisches Management
Strategieprozess
Unternehmensstrategie

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Grundlagen des strategischen Managements werden in betriebswirtschaftlichen Aus- und Weiterbildungen oft als Basis für ein unternehmenskonzeptionelles Verständnis genutzt. Anhand von anwendungsnahen Fragen entlang der Phasen strategischer Planung können Studierende dieses Wissen in der Praxis verankern und mit einer umfassenden Fallstudie alle Aspekte des strategischen Managements verknüpfen. Anzahl Seiten: 44 ISSN: 2673-4737

uk: вхід без авторизації

name: Angewandte Lernkontrollen zum Strategischen Management


keywords:
Interpersonal communication
Difficult conversations
Downsizing
Transitional leadership

uk: Бізнес та економіка

uk: Бізнес-адміністрування

uk: Соціальні комунікації/Журналістика

uk: Право, економіка та суспільні науки

description: Set in the aftermath of the financial crisis, this case study focuses on leadership communication in the context of organizational change. Students explore the psychological aspects of downsizing and the differences between one-way and two-way communication as well as the advantages and shortcomings of both forms of communication in the context of organizational transition. Anzahl Seiten: 27 ISSN: 2673-4737

uk: вхід без авторизації

name: Interpersonal communication in organizational transitions


keywords:
Change Management
Lean Production
Manufacturing
Occupational Safety

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: TAJV is a Turkish-American joint venture production company located in the Turkish Marmara region. Since 2001, it has expanded rapidly due to its lean production system and high quality products. Triggered by a tragic accident in 2016, the EMEA (Europe/Middle East Africa) Safety Manager of the American parent company faces the challenge to quickly improve the safety behavior at the Turkish sites. Anzahl Seiten: 20

uk: вхід без авторизації

name: Managing Change in Safety Behavior at a Turkish-American Joint Venture Production Site


Alternative Bank Schweiz

keywords:
Brand Identity Management
Reputationsmanagement
Integrierte Unternehmenskommunikation

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Banken mit Schwerpunkt Nachhaltigkeit wie die Alternative Bank Schweiz (ABS) gingen gestärkt aus der Finanzkrise ab 2008 hervor. Doch zunehmend setzt auch die konventionelle Konkurrenz auf den Trend Nachhaltigkeit. Ausserdem erweist sich für die ABS die fehlende Bekanntheit als Wachstumshemmer. Hinzu kommen Fragen zu einem im Sinne ihrer Geschäftsphilosophie adäquaten Umgang mit der Digitalisierung: Eine mehrfache Herausforderung für Markenführung, Reputationsmanagement und Kommunikation. Anzahl Seiten: 36

uk: вхід без авторизації


keywords:
Nachfolgeplanung
Laufbahnplanung 50plus
Wissensmanagement
Abgabe der Führungsfunktion
funktionale Flexibilität
Retention Management

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Die Fallstudie «Vom Head HR zum HR Consultant – ein später Karriereschritt bei der Aduno Gruppe» beleuchtet den Funktionswechsel des ehemaligen Head HR der Aduno Gruppe Rolf Arnet, der seine Funktion als Mitglied der Geschäftsleitung aufgab, um zukünftig im selben Unternehmen als HR Consultant strategische Projekte zu leiten. Anzahl Seiten: 19 ISSN: 2673-4737

uk: вхід без авторизації

name: Vom Head HR zum HR Consultant: Ein später Karriereschritt bei der Aduno Gruppe


keywords:
Spieltheorie
Gefangenendilemma
Pandemie
Coronavirus
Social Distancing

uk: Бізнес та економіка

de: Mathematik

en: Mathematics

de: Fachübergreifend

uk: Міждисциплінарний

en: Interdisciplinary

de: Mathematik, Naturwissenschaften

uk: Математика, природничі науки

uk: Право, економіка та суспільні науки

description: Im Frühjahr 2020 kommt es wegen des neuen Coronavirus SARS-CoV-2 und der damit verbundenen neuen Krankheit COVID-19 zu einer Pandemie. Mit dem Bestreben, einen Kollaps des Gesundheitssystems zu vermeiden, ergreifen die betroffenen Staaten drastische Massnahmen, welche die Freiheiten der Einwohnerinnen und Einwohner stark einschränken. Ob die epidemische Welle in einem kontrollierbaren Umfang gehalten werden kann, hängt vom Verhalten der Bevölkerung ab. Diese analytische Fallstudie befasst sich in einer spieltheoretischen Betrachtung auf der Grundlage des Gefangenendilemmas mit dem Verhalten der Menschen während der epidemischen Krise. Anzahl Seiten: 30 ISSN: 2673-4737

uk: вхід без авторизації

name: Coronavirus-Pandemie und das Gefangenendilemma


Leadership bei der Killer Interior AG

keywords:
Führung
Familienunternehmen
Holzbau
Lean Management

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Die Fallstudie beleuchtet, wie das Aargauer Familienunternehmen Killer Interior AG mit den Prinzipien der transformationalen Führung einschneidende betriebliche Veränderungen vollzogen hat. Diese präge das heutige Erscheinungsbild und Selbstverständnis des Unternehmens und haben – dem sehr schwierigen Marktumfeld trotzend – die Basis für den wirtschaftlichen Erfolg gelegt. Anzahl Seiten: 24 ISSN: 2673-4737

de: keine Anmeldung erforderlich

uk: вхід без авторизації

en: no login required


keywords: Marketing Marketingphilosophie Marketinganalyse Kundenakquise Kundenbindung

uk: Бізнес та економіка

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

description: Das primäre Ziel des Marketings ist eine profitable Befriedigung der Kundenbedürfnisse. Nach einer Einleitung in die Aufgaben des Marketings sowie Marketingphilosophie werden Kundenbedürfnisse und –nutzen näher erläutert und verschiedene Marketingkonzepte und Instrumente sowie die Durchführung von Marketinganalysen anhand von Beispielen erläutert. Besondere Aufmerksamkeit wird auf die Kundenakquisition und –bindung gelegt. Anzahl Seiten: 49 ISSN: 2673-4737

uk: вхід без авторизації

name: Philosophie und Grundlagen des Marketings: Erfolgreich Kunden und Kundinnen akquirieren und rentable Kunden und Kundinnen langfristig binden


Mueblex AG

keywords:
Finanzmanagement
Management Accounting
Kostenrechnung
Management by Objectives
Industrie

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Die Firma Mueblex AG stellt Bürostühle her und verkauft diese im Markt Schweiz. Der Sitz befindet sich im schweizerischen Mittelland. Das Unternehmen mit rund 20 Mitarbeitenden erwirtschaftet seit einigen Jahren eine Rentabilität, die unter dem Branchendurchschnitt liegt. Die Liquidität ist mittelfristig gesichert, erlaubt aber keine grösseren Investitionen zur Erhaltung der Unternehmenssubstanz. Familienintern konnte für den altersbedingt ausscheidenden Firmeninhaber, der zugleich während der letzten 30 Jahre Geschäftsführer war, keine Nachfolge gefunden werden. Deshalb entschloss sich der Inhaber, die Mueblex AG an die deutsche Haubas-Gruppe zu verkaufen. Die Mueblex AG soll weiterhin unter dem bisherigen Firmennamen hauptsächlich den Markt Schweiz bedienen. Vom neuen Mutterhaus wurde ein CEO ad interim beordert. Sie sind der/die neue FinanzchefIn (CFO ) der Mueblex AG. Anzahl Seiten: 17 ISSN: 2673-4737

uk: вхід без авторизації


Scotts Custom Catering

keywords: Strategie VRIO SWOT Porter Organisation Prozessdarstellung

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Scott ist ein leidenschaftlicher Koch, dessen kulinarische Kochkunst oft und gerne von seinen Kunden in Anspruch genommen wird. So ist es ihm gelungen von Anfang an, mit seiner Firma Custom Catering eine Existenzgrundlage zu schaffen. Allerdings arbeitet er im Durchschnitt 60 Stunden pro Woche. Dies will er ändern, weiterhin profitabel wachsen und gleichzeitig seine Arbeitsbelastung reduzieren. Anzahl Seiten: 41 ISSN: 2673-4737

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keywords:
Verschuldung
Zins
Rückzahlung
Fiskal- und Geldpolitik
Inflation
Coronakrise

de: Politikwissenschaft

uk: Політологія

en: Political Science

uk: Бізнес-адміністрування

uk: Право, економіка та суспільні науки

uk: Бізнес та економіка

description: Im Frühjahr 2020 brach mit COVID-19 eine weltweite Pandemie aus. Deren teilweise lebensbedrohende Gefahren bekämpften die Staaten mit Lockdowns. Ausser dem Gesundheitssektor, Altersheimen, dem Öffentlichen Verkehr und dem Bau mussten praktisch alle Branchen schliessen, was zu Angebots- und Nachfrageschocks führte. Den drohenden wirtschaftlichen Kollaps versuchten die Industrieländer mit Liquiditätsspritzen und Kurzarbeitstherapie abzuwenden. Die Schweizer Arbeitslosenversicherung benötigte denn auch schon im Sommer 2020 staatliche Unterstützung von über 20 Mrd. CHF. Liquidität floss von der Nationalbank an die Geschäftsbanken, welche dank staatlicher Garantien schnell umfangreiche Kredite an ihre Kunden verteilen konnten. Neben solchen Darlehen an die Firmen gab es grosszügige Direktzahlungen. Tendenziell türmt sich beim Bund für 2020 ein finanzielles Defizit von 21 Mrd. CHF auf und da sind die Ausfallkosten auf die 40 Mrd. CHF durch staatliche Bürgschaften gesicherten Kredite noch nicht eingerechnet. Nun folgt die Zeit der Aufräumarbeiten und der Folgenabschätzung. Anzahl Seiten: 48 ISSN: 2673-4737

uk: вхід без авторизації

name: Explodierende Schulden der Schweiz in Corona-Zeiten