Compilation for QCSP

We propose in this article a framework for compilation of quantified constraint satisfaction problems (QCSP). We establish the semantics of this formalism by an interpretation to a QCSP. We specify an algorithm to compile a QCSP embedded into a search algorithm and based on the inductive semantics of QCSP. We introduce an optimality property and demonstrate the optimality of the interpretation of the compiled QCSP.Comment: Proceedings of the 13th International Colloquium on Implementation of Constraint LOgic Programming Systems (CICLOPS 2013), Istanbul, Turkey, August 25, 201

Return probability after a quench from a domain wall initial state in the spin-1/2 XXZ chain

We study the return probability and its imaginary ($\tau$) time continuation after a quench from a domain wall initial state in the XXZ spin chain, focusing mainly on the region with anisotropy $|\Delta|< 1$. We establish exact Fredholm determinant formulas for those, by exploiting a connection to the six vertex model with domain wall boundary conditions. In imaginary time, we find the expected scaling for a partition function of a statistical mechanical model of area proportional to $\tau^2$, which reflects the fact that the model exhibits the limit shape phenomenon. In real time, we observe that in the region $|\Delta|<1$ the decay for large times $t$ is nowhere continuous as a function of anisotropy: it is either gaussian at root of unity or exponential otherwise. As an aside, we also determine that the front moves as $x_{\rm f}(t)=t\sqrt{1-\Delta^2}$, by analytic continuation of known arctic curves in the six vertex model. Exactly at $|\Delta|=1$, we find the return probability decays as $e^{-\zeta(3/2) \sqrt{t/\pi}}t^{1/2}O(1)$. It is argued that this result provides an upper bound on spin transport. In particular, it suggests that transport should be diffusive at the isotropic point for this quench.Comment: 33 pages, 8 figures. v2: typos fixed, references added. v3: minor change

Consumer confusion and multiple equilibria

This paper focuses on consumer confusion when firms may choose between credible and non-credible certification systems for signalling quality. It is shown that the presence of confused consumers leads to the emergence of multiple stable equilibria, in which either all firms select the credible certification or all firms select the non-credible certification. A situation with numerous confused consumers is characterized by the complete absence of credible certification.Quality, certification

Becoming oneself through trials: a framework for identity work research.

This paper aims to offer a new way to think and to study identity work in relation with organizational identity regulation attempts and a deeper understanding of both the several facets of materiality of identity work and the agency/structure interplays in this process. The current growing body of studies about identity work is useful to understand how the self become. However, these studies encounter some limits, especially the lack of contextualization of individuals' identity work vis-à-vis broader cultural and social structures and their organizational diffraction or the overemphasis on discourses at the expense of other identity resources, whereof material artefacts and embodied practices. To overcome these limits, this paper intends to offer a framework based on the concept of trials designed by the French sociologist Danilo Martuccelli, which are ‗historical challenges, socially produced, culturally represented, unequally distributed, that individuals must face' (Araujo and Martuccelli, 2010:8). I argue that when facing an identity trial, an organizational member measure himself and this can be a useful framework to think identity work and to overtake the limits underlined above. Methodological implications of this perspective - identity trials as analytical lens to study identity work - are further discussed.

Becoming oneself through trials: a framework for identity work research.

This paper aims to offer a new way to think and to study identity work in relation with organizational identity regulation attempts and a deeper understanding of both the several facets of materiality of identity work and the agency/structure interplays in this process. The current growing body of studies about identity work is useful to understand how the self become. However, these studies encounter some limits, especially the lack of contextualization of individuals‘ identity work vis-à-vis broader cultural and social structures and their organizational diffraction or the overemphasis on discourses at the expense of other identity resources, whereof material artefacts and embodied practices. To overcome these limits, this paper intends to offer a framework based on the concept of trials designed by the French sociologist Danilo Martuccelli, which are ‗historical challenges, socially produced, culturally represented, unequally distributed, that individuals must face‘ (Araujo and Martuccelli, 2010:8). I argue that when facing an identity trial, an organizational member measure himself and this can be a useful framework to think identity work and to overtake the limits underlined above. Methodological implications of this perspective – identity trials as analytical lens to study identity work – are further discussed.Identity regulation; Trials; Identity work;

On Tail Index Estimation based on Multivariate Data

This article is devoted to the study of tail index estimation based on i.i.d. multivariate observations, drawn from a standard heavy-tailed distribution, i.e. of which 1-d Pareto-like marginals share the same tail index. A multivariate Central Limit Theorem for a random vector, whose components correspond to (possibly dependent) Hill estimators of the common shape index alpha, is established under mild conditions. Motivated by the statistical analysis of extremal spatial data in particular, we introduce the concept of (standard) heavy-tailed random field of tail index alpha and show how this limit result can be used in order to build an estimator of alpha with small asymptotic mean squared error, through a proper convex linear combination of the coordinates. Beyond asymptotic results, simulation experiments illustrating the relevance of the approach promoted are also presented

Thinking the unthinkable: managerialization of work related suicides as a framing process.

Managerialism has been studied in many ways, including diffusion of management techniques notably in public sectors, management ideology or the colonization of everyday life by management thought. However, the process leading to managerialism, namely managerialization, has been largely unexplored in this literature. This article draws upon framing theory to better understand managerialization processes. The article offers two case studies that investigate following theoretical assumptions: (1) managerialization acts as a framing process on every kind of issue; (2) managerialization has framing process characteristics. Two frame analysis based on newspaper articles about work related suicide show that one of the identified frames has strong managerial characteristics and suggest that managerialization took place as a set of framing processes. Taken together, these studies provide insight to characterize the process of managerialization. Research implications and limitations are discussed in order to highlight directions for futher researchs.Work related suicide; Framing process; Frame analysis; Managerialism; Managerialization;

Thinking the unthinkable: managerialization of work related suicides as a framing process

Managerialism has been studied in many ways, including diffusion of management techniques notably in public sectors, management ideology or the colonization of everyday life by management thought. However, the process leading to managerialism, namely managerialization, has been largely unexplored in this literature. This article draws upon framing theory to better understand managerialization processes. The article offers two case studies that investigate following theoretical assumptions: (1) managerialization acts as a framing process on every kind of issue; (2) managerialization has framing process characteristics. Two frame analysis based on newspaper articles about work related suicide show that one of the identified frames has strong managerial characteristics and suggest that managerialization took place as a set of framing processes. Taken together, these studies provide insight to characterize the process of managerialization. Research implications and limitations are discussed in order to highlight directions for futher researchs.Work related suicide, Framing process, Frame analysis, Managerialism, Managerialization