BACKGROUND The aim of the study was to investigate (1) how much of the association between health and social class is accounted by psychosocial working conditions, and (2) whether health is related to working conditions after controlling for social class. METHODS The data derive from the surveys of the Helsinki health study, collected in 2000, 2001, and 2002 from 40-60 year old employees work...

Social recommendation is almost as the integration of the business platform and social 1 platform, and gradually become a top in recommendation system. Social recommendation algorithm 2 solves the problem of cold start and data sparseness for traditional commodity, while the internal 3 structure of the relationship graph in social relations has not been fully excavated. This paper proposes 4 tw...

Social justice is a concept of fair and just relations between the individual and society. This relation will assay by the government, according to fair distribution of opportunities and facilities. After 20 century, there was always emphasis on the role of states as social justice's agents in society by formulating and implementing of policy. The main question is what is the place of social ju...

A B S T R AC T We proposed that the social exchange relationships individuals form in the workplace would mediate the relation between perceptions of interactional and distributive justice and social loafing. Specifically, we argued that both leader–member exchanges (LMX) and team–member exchanges (TMX) would mediate the relation between interactional justice and social loafing, and that LMX wo...

objective: the aim of our study was to investigate the effect of coping strategies, personality trait and social support as the main social and psychological factors on infertility stress. materials and methods: this study was conducted on 201 infertile iranian women referred to the vali-e-asr reproductive health research center, and completed the following questionnaires: the fertility problem...

Abstract. Spectral partitioning is a well known method in the area of graph and matrix analysis. Several approaches based on spectral partitioning and spectral clustering were used to detect structures in real world networks and databases. In this paper, we explore two community detection approaches based on the spectral partitioning to analyze a coauthorship network. The partitioning exploits ...

We derive explicit stability conditions for delay difference equations in C n (the set of n complex vectors) and estimates for the size of the solutions are derived. Applications to partial difference equations, which model diffusion and reaction processes, are given. 1. Introduction. Stability of systems of difference equations with delays has been discussed by many authors, for example, see G...

Abstract This article introduces the basic qualitative and basic quantitative theory of Volterra integral equations on time scales and thus may be considered as a foundation for future advanced studies in the field. New sufficient conditions are introduced that guarantee: existence; uniqueness; approximation; boundedness and certain growth rates of solutions to both linear and nonlinear problem...

A language (resp. a relation) is expressible by a word equation e if it is dened as the set of all values of an unknown (resp. a set of unknowns) over all solutions of the equation e. We show rst tools that a language or a relation is not expressible by using a certain number of auxiliary unknowns. As a consequence an in nite hierarchy based on the number of auxiliary unknowns of expressible la...