Toulouse School of Management Research

In this paper, the problem of robust stability of systems subject to parametric uncertainties is considered. Sufficient conditions for the existence of parameter-dependent Lyapunov functions are given in terms of a criterion which is reminiscent of, but less conservative than, Popov's stability criterion. An equivalent frequency-domain criterion is demonstrated. The relative sharpness of the proposed test and existing stability criteria is then discussed. The use of parameter-dependent Lyapunov functions for robust controller synthesis is then considered. It is shown that the search for robustly stabilizing controllers may be limited to controllers with the same order as the original plant. A possible synthesis procedure and a numerical example are then discussed.

BACKGROUND/AIMS: Numerous studies have indicated the value of music therapy in the management of patients with Alzheimer's disease. A recent pilot study demonstrated the feasibility and usefulness of a new music therapy technique. The aim of this controlled, randomised study was to assess the effects of this new music therapy technique on anxiety and depression in patients with mild to moderate Alzheimer-type dementia. METHODS: This was a single-centre, comparative, controlled, randomised study, with blinded assessment of its results. The duration of follow-up was 24 weeks. The treated group (n = 15) participated in weekly sessions of individual, receptive music therapy. The musical style of the session was chosen by the patient. The validated 'U' technique was employed. The control group (n = 15) participated under the same conditions in reading sessions. The principal endpoint, measured at weeks 1, 4, 8, 16 and 24, was the level of anxiety (Hamilton Scale). Changes in the depression score (Geriatric Depression Scale) were also analyzed as a secondary endpoint. RESULTS: Significant improvements in anxiety (p < 0.01) and depression (p < 0.01) were observed in the music therapy group as from week 4 and until week 16. The effect of music therapy was sustained for up to 8 weeks after the discontinuation of sessions between weeks 16 and 24 (p < 0.01). CONCLUSION: These results confirm the valuable effect of music therapy on anxiety and depression in patients with mild to moderate Alzheimer's disease. This new music therapy technique is simple to implement and can easily be integrated in a multidisciplinary programme for the management of Alzheimer's disease.

Gray matter atrophy, glucose hypometabolism, and β-amyloid Aβ deposition are well-described hallmarks of Alzheimer's disease, but their relationships are poorly understood. The present study aims to compare the local levels of these three alterations in humans with Alzheimer's disease. Structural magnetic resonance imaging, (18)F-fluorodeoxyglucose positron emission tomography (PET), and (18)F-florbetapir PET data from 34 amyloid-negative healthy controls and 20 demented patients with a high probability of Alzheimer's disease etiology (attested using neuroimaging biomarkers as recently recommended) were analyzed. For each patient and imaging modality, age-adjusted Z-score maps were computed, and direct between-modality voxelwise comparison and correlation analyses were performed. Significant differences in the levels of atrophy, hypometabolism, and Aβ deposition were found in most brain areas, but the hierarchy differed across regions. A cluster analysis revealed distinct subsets of regions: (1) in the hippocampus, atrophy exceeded hypometabolism, whereas Aβ load was minimal; (2) in posterior association areas, Aβ deposition was predominant, together with high hypometabolism and lower but still significant atrophy; and (3) in frontal regions, Aβ deposition was maximal, whereas structural and metabolic alterations were low. Atrophy and hypometabolism significantly correlated in the hippocampus and temporo-parietal cortex, whereas Aβ load was not significantly related to either atrophy or hypometabolism. These findings provide direct evidence for regional variations in the hierarchy and relationships between Aβ load, hypometabolism, and atrophy. Altogether, these variations probably reflect the differential involvement of region-specific pathological or protective mechanisms, such as the presence of neurofibrillary tangles, disconnection, as well as compensation processes.

SUMMARY There has been limited research into how different types of supply networks can be created and operated. This article develops a taxonomy of supply networks with a particular focus on managing network creation and operation. The taxonomy is based on a review of network literature from various academic perspectives and extensive empirical data across a variety of industry sectors including automotive, fast‐moving consumer goods, electronics, pharmaceuticals, and communications technologies. The main differentiating factors for classifying a matrix of four types of supply network are found to be the degree of supply network dynamics and the degree of focal company supply network influence. Network characteristics and different patterns ofnetworking activities are identified for each type of supply network.

Conceptual blending is a basic mental operation that leads to new meaning, global insight, and conceptual compressions useful for memory and manipulation of otherwise diffuse ranges of meaning. It plays a fundamental role in the construction of meaning in everyday life, in the arts and sciences, and especially in the social and behavioral sciences. The essence of the operation is to construct a l The present paper presents a synopsis of work on language, form, and meaning in conceptual integration theory. lt consists of excerpts and summaries from

Solutions of polyelectrolyte are studied by small angle neutron scattering for c > 0.5 x 10-2 g. cm -3. The function S(q) is characterized by a small value of S'(q → 0) and one broad maximum for higher q's (10-2 < q < 2 x 10-1 Å-1) . The effect of polyion concentration and addition of salt are studied : the position of the maximum varies with polyion concentration and when salt is added to the solution, forward scattering appears and the peak vanishes.

Behavioral and psychological symptoms of dementia (BPSD), constitute a major clinical component of Alzheimer's disease (AD). There is a growing interest in BPSD as they are responsible for a large share of the suffering of patients and caregivers, and they strongly determine the patient's lifestyle and management. Better detection and understanding of these symptoms is essential to provide appropriate management. This article is a consensus produced by the behavioral group of the European Alzheimer's Disease Consortium (EADC). The aim of this article is to present clinical description and biological correlates of the major behavioral and psychological symptomatology in AD. BPSD is not a unitary concept. Instead, it should be divided into several symptoms or more likely: groups of symptoms, each possibly reflecting a different prevalence, course over time, biological correlate and psychosocial determinants. There is some clinical evidence for clusters within groups of BPSD. Biological studies indicate that patients with AD and BPSD are associated with variations in the pathological features (atrophy, brain perfusion/metabolism, histopathology) when compared to people with AD without BPSD. An individually tailored approach taking all these aspects into account is warranted as it may offer more, and better, pharmacological and non-pharmacological treatment opportunities.

Jails and prisons are major sites of novel coronavirus (SARS-CoV-2) infection. Many jurisdictions in the United States have therefore accelerated the release of low-risk offenders. Early release, however, does not address how arrest and pretrial detention practices may be contributing to disease spread. Using data from Cook County Jail-one of the largest known nodes of SARS-CoV-2 spread in the United States-in Chicago, Illinois, we analyzed the relationship between jailing practices and community infections at the ZIP code level. We found that jail-community cycling was a significant predictor of cases of coronavirus disease 2019 (COVID-19), accounting for 55 percent of the variance in case rates across ZIP codes in Chicago and 37 percent of the variance in all of Illinois. Jail-community cycling far exceeds race, poverty, public transit use, and population density as a predictor of variance. The data suggest that cycling people through Cook County Jail alone is associated with 15.7 percent of all documented COVID-19 cases in Illinois and 15.9 percent of all documented cases in Chicago as of April 19, 2020. Our findings support arguments for reduced reliance on incarceration and for related justice reforms both as emergency measures during the present pandemic and as sustained structural changes vital for future pandemic preparedness and public health.

BACKGROUND/AIMS: Behavioural and psychological symptoms have a high prevalence amongst patients with dementia and can be a significant source of distress to both patients and carers. The present study explored the relationships between quality of life and behavioural and psychological symptoms in dementia (BPSD) from both patient and carer perspectives. Contextual factors surrounding the occurrence of BPSD were explored. METHODS: Forty-six patients and 116 carers completed questionnaire measures of BPSD and quality of life. RESULTS: BPSD were negatively associated with both patient and carer ratings of patient quality of life. The symptoms related to lower quality of life differed between patient and carer ratings: depression and irritability were found to predict lower carer ratings of quality of life, whilst delusions and apathy indicated lower patient ratings. Carers were found to be poor at identifying antecedents and consequences of BPSD. CONCLUSIONS: The presence of BPSD is associated with lower quality of life in dementia. Interventions designed to improve the quality of life for patients should focus on the BPSD specifically associated with the patient's rating of quality of life. Information regarding the role of contextual factors in behaviour management should be made available to carers.

Purpose This paper examines citizens' attitudes toward paying taxes – what is sometimes termed their “tax morale” or the intrinsic motivation to pay taxes – focusing on the experience of individuals in the Russian Federation before, during, and after the transition from a planned socialist economy to a market‐based economy. Design/methodology/approach Micro‐level data for Russia from the World Values Survey and the European Values Survey for the years 1991, 1995, and 1999 are used to estimate the determinants of individuals' attitudes toward paying taxes. The data also allow the examination of the evolution of tax morale in the regions of Russia. Findings The estimation results show decay in tax morale in the first four years of the transition, and a small recovery in 1999. Significant regional differences in tax morale are also found. Research limitations/implications The results are consistent with the relevance of social norms in tax compliance, where the widespread perception of tax evasion and of a corrupt and inefficient state led initially to a decline of tax morale. The results also indicate that the restoration of a higher level of trust in the state, after some progress in the transition to a market economy, positively influenced tax morale. Practical implications The results suggest, once tax morale is crowded out, it is difficult for government to raise tax morale very quickly back to previous levels. Doing so requires designing tax systems, tax administrations, and government structures that inspire trust and pride in governmental and legal institutions. Originality/value A unique aspect of the analysis is the ability to study tax morale at the individual level before (1991), during (1995), and shortly after (1999) the Russian transition.

This study presents a three‐year effort to study public sector innovation in Europe from the viewpoint of the citizen. It examines a model of public sector innovation across a multinational sample of eight countries and 626 participants. The paper develops a theory of antecedents to and consequences of innovation in public administration as perceived by knowledgeable citizens and end‐users. Participants were senior and mid‐level managers of third sector organizations that work closely with citizens both as individuals and groups, and with public sector agencies in various domains. Structural Equation Modeling technique was used to examine two theoretical and five alternative models. Major findings that transcend national borders were found to be: (1) responsiveness, together with leadership and vision are important antecedents of innovation in the public sector; (2) public sector innovation affects trust in and satisfaction with public administration; and (3) the effect of public sector innovation on trust and satisfaction is both direct and mediated by the image of public organizations. The paper ends with a discussion of the theoretical and practical implications for public administration theory, especially for public sector innovation in Europe, and with directions for future studies.

Confidence in the health care system implies an expectation that sufficient and appropriate treatments will be provided if needed. The COVID-19 public health crisis is a significant, global, and (mostly) simultaneous test of the behavioral implications arising from this confidence. We explore whether populations reporting low levels of confidence in the health care system exhibit a stronger behavioral reaction to the COVID-19 pandemic. We track the dynamic responses to the COVID-19 pandemic across 38 European countries and 621 regions by employing a large dataset on human mobility generated between February 15 and June 5, 2020 and a broad range of contextual factors (e.g., deaths or policy implementations). Using a time-dynamic framework we find that societies with low levels of health care confidence initially exhibit a faster response with respect to staying home. However, this reaction plateaus sooner, and after the plateau it declines with greater magnitude than does the response from societies with high health care confidence. On the other hand, regions with higher confidence in the health care system are more likely to reduce mobility once the government mandates that its citizens are not to leave home except for essential trips, compared to those with lower health care system confidence. Regions with high trust in the government but low confidence in the health care system dramatically reduce their mobility, suggesting a correlation for trust in the state with respect to behavioral responses during a crisis.

Behavioural responses to pandemics are less shaped by actual mortality or hospitalisation risks than they are by risk attitudes. We explore human mobility patterns as a measure of behavioural responses during the COVID-19 pandemic. Our results indicate that risk-taking attitudes are a critical factor in predicting reductions in human mobility and social confinement around the globe. We find that the sharp decline in mobility after the WHO (World Health Organization) declared COVID-19 to be a pandemic can be attributed to risk attitudes. Our results suggest that regions with risk-averse attitudes are more likely to adjust their behavioural activity in response to the declaration of a pandemic even before official government lockdowns. Further understanding of the basis of responses to epidemics, e.g., precautionary behaviour, will help improve the containment of the spread of the virus.

Building on an in-depth ethnographic study at a renowned research laboratory, we show how the interactions of organizational routines can be more or less generative by tracing and analyzing how human and nonhuman actors (actants) connect routines. Adopting a performative perspective, we compare the connecting of such actants and study how they are engaged in routine performances. We relate observed differences in the generativity of routine interactions to whether actants become mediators or intermediaries. Whereas intermediaries merely maintain connections between routines, mediators can modify them when performing routine connections. We identify three generative effects mediators can lead to: (1) the creation of innovative outcomes, (2) the adaptation of existing routine performances, and/or (3) the emergence of new routine performances. Similar to the conception of organizational routines as dynamic and generative systems, we show that the way actants operate through their engagement renders routine interactions and thus ecologies of routines more or less generative.

Abstract Large complicated projects with interdependent activities can be described by project networks. Arcs represent activities, nodes represent events, and the network's structure defines the relation between activities and events. A schedule associates an occurrence time with each event: the project can be scheduled in several different ways. We assume that a known amount of cash changes hands at each event. Given any schedule the present value of all cash transactions can be calculated. The payment scheduling problem looks for a schedule that maximizes the present value of all transactions. This problem was first introduced by Russell [2]; it is a nonlinear program with linear constraints and a nonconcave objective. This paper demonstrates that the payment scheduling problem can be transformed into an equivalent linear program. The linear program has the structure of a weighted distribution problem and an efficient procedure is presented for its solution. The algorithm requires the solution of triangular systems of equations with all matrix coefficients equal to ± or 0.

OBJECTIVES: This cross-sectional study investigated the relationships between behavioural and psychological symptoms of dementia (BPSD). METHODS: We recruited 194 patients with dementia from the memory clinic practice of six European Alzheimer's Disease Consortium centres. BPSD were assessed using a pre-designed questionnaire comprising the Neuropsychiatric Inventory (NPI). BPSD scores were analysed by Spearman's correlation analysis and principal components factor analysis. Results were confirmed by performing Varimax rotation of the factors. RESULTS: The NPI symptoms occurred very frequently: 96% of the patients displayed at least one symptom. Among them, apathy (59.6%) and depression (58.5%) were the most common abnormalities, followed by irritability (44.6%), anxiety (44%) and agitation (41.5%). Four NPI-based factors were identified (58% of the common variance): psychosis factor (irritability, agitation, hallucinations and anxiety), psychomotor factor (aberrant motor behaviour and delusions), mood liability factor (disinhibition, elation and depression) and instinctual factor (appetite disturbance, sleep disturbance and apathy). CONCLUSION: Psychosis, psychomotor factor, mood liability factor and instinctual factor form four distinct behavioural syndromes in dementia. We report the novel observation that depression clusters together with disinhibition and elation within a mood liability factor. This finding highlights the nature of mood, and mood oscillations, from depression to disinhibition within the cluster, and has implications for treatment by taking into consideration the poles of the mood scale and any oscillation between them.

There is a vast empirical literature investigating the relationship between government size and economic growth. But the empirical evidence of growth effects of public expenditure using cross-country regressions is still inconclusive. According to a number of authors this is not surprising since the negative relationship only applies for rich countries with a large public sector. Restricting their analysis on rich countries only they can show the predicted negative impact. Naturally, a selection of a sub-sample of rich countries is always somewhat arbitrary. Another possibility is to concentrate on governments within a rich country. However, only few studies investigate the effect of state and local spending on economic growth. This study concentrates on the relationship between public expenditure and economic growth within a rich country using the full sample of state and local governments from Switzerland over the 1981-2001 period. The general finding is a fairly robust negative relationship between government size and economic growth. However, in contrast to public spending from operating budgets there is no significant impact on economic growth by expenditure from capital budgets.

How do individuals form fairness perceptions? This question has been central to the fairness literature since its inception, sparking a plethora of theories and a burgeoning volume of research. To date, the answer to this question has been predicated on the assumption that fairness perceptions are subjective (i.e., "in the eye of the beholder"). This assumption is shared with motivated cognition approaches, which highlight the subjective nature of perceptions and the importance of viewing individuals arriving at those perceptions as active and motivated processors of information. Further, the motivated cognition literature has other key insights that have been less explicitly paralleled in the fairness literature, including how different goals (e.g., accuracy, directional) can influence how individuals process information and arrive at their perceptions. In this integrative conceptual review, we demonstrate how interpreting extant theory and research related to the formation of fairness perceptions through the lens of motivated cognition can deepen our understanding of fairness, including how individuals' goals and motivations can influence their subjective perceptions of fairness. We show how this approach can provide integration as well as generate new insights into fairness processes. We conclude by highlighting the implications that applying a motivated cognition perspective can have for the fairness literature and by providing a research agenda to guide the literature moving forward. (PsycINFO Database Record

BACKGROUND: The detrimental impact of dementia upon patient health-related quality of life (HRQL) is well established, as is the importance of improving HRQL. However, relatively little is known about the natural history of HRQL in dementia and those factors influencing it. This limited knowledge potentially restricts the evaluation of the efficacy of interventions designed to improve HRQL. One such area concerns the relationship between HRQL and patient insight. It remains unclear what impact, if any, impaired insight has upon a patient's HRQL. The present study aimed to investigate the relationship between insight and HRQL in a sample of patients with Alzheimer's disease (AD) and their carers. METHODS: 256 patients with AD were recruited as part of AddNeuroMed, a multicentre European AD biomarkers study. Of these, 174 completed a quality-of-life measure in addition to a comprehensive battery of clinical and neuropsychological assessments. RESULTS: Insight was found to be differentially related to patient perceptions of HRQL in mild and moderate dementia. Within moderate dementia, impaired insight was associated with better perceived HRQL. Conversely, cognition, but not insight, was associated with impaired HRQL in mild dementia. Insight was not found to be associated with carer perceptions of patient HRQL. CONCLUSION: Impairment of insight is associated with better HRQL in moderate dementia. This finding has implications for interventions which focus on increasing patient awareness and orientation, as impairment of insight appears to have a positive impact upon HRQL.

Abstract Tax compliance by the wealthy is relevant not only because their contributions are essential to maintain public budgets and social equality, but because their (non)compliance behavior and the perceived (un)fairness of their contributions can fuel social unrest. In this article, after giving a brief history of taxing the wealthy, we review the existing theoretical, empirical, and policy literature on their tax compliance. We discuss how and why the wealthy differ from less affluent taxpayers because of specific interrelated political, social, and psychological conditions. Understanding the psychological mechanisms that determine the tax compliance of the wealthy can provide policy insights on how to better integrate the wealthy in the tax system. Therefore, the present review is also a starting point for new policy approaches to increase tax compliance and tax morale among the wealthy.