Stress at work and psychological and immunological parameters in a group of Norwegian female bank employees

This study concerned the immunological correlates of stress and work. Self reported stress, emotional state, ego-strength, and defensiveness were examined in relation to measures of cellular immunity (T-cell response to Con A and number of T4 and T8 cells) and humoral immunity (concentrations of immunoglobulins and complement components in plasma) in a group of 96 Norwegian female bank employees. The analyses showed that workload, the stress factor with the highest group mean, was associated with number of T-cells, while strain due to body posture during work was related to concentrations of IgM and C3. Further, depression was significantly correlated with IgM concentration and T-cell number, and anxiety with C3 concentration. T-cell activity was the immunological parameter most consistently associated with psychological well-being, showing positive correlations with defensiveness and ego-strength and negative correlations with anxiety and depression. In conclusion, T-cell number and concentrations of IgM and C3 were sensitive to both work-related stress experience and emotional distress. Coping abilities, indicated by the MMPI Ego-strength scale and emotional distress, were reflected in T-cell activity; insufficient coping was associated with low T-cell activity.     

Pipage Rounding: A New Method of Constructing Algorithms with Proven Performance Guarantee

The paper presents a general method of designing constant-factor approximation algorithms for some discrete optimization problems with assignment-type constraints. The core of the method is a simple deterministic procedure of rounding of linear relaxations (referred to as pipage rounding). With the help of the method we design approximation algorithms with better performance guarantees for some well-known problems including MAXIMUM COVERAGE, MAX CUT with given sizes of parts and some of their generalizations.     

Size,Skill and Sorting

Abstract. The rise in inequality between the 1970s and the 1990s and the persistent gap in pay between large and small employers are two of the most robust findings in the study of labor markets. Mainstream economists focus on differences in observable and unobservable skills to explain both the overall rising inequality and the size–wage gap. In this paper we model how increasing returns to skill can affect the size–wage gap both with constant sorting and with size‐biased, skill‐biased technological change (e.g. if large firms always had access to computers, but small firms gained access to computers with the rise of affordable personal computers). We analyze the Current Population Surveys from 1979 to 1993 to determine whether large and small employers are converging in terms of mean wages (the employer size–wage effect), wage structures by occupation and education, characteristics of employees, and wage structures by region. We find mixed evidence of convergence and no consistent support for any single version of human capital theory.     

沙发检测装置应力及疲劳性能研究

为提高折叠沙发检测装置可靠性,满足技术机构开展检测工作的需求,提出采用有限元分析的方法,对装置的腿部、座部和背部受力单元进行应力和疲劳性能研究。根据应力云图优化装置结构,利用疲劳分析模块Fatigue Tool模拟装置耐久性能。模拟结果验证了装置耐久性设计的合理性。     

ESTIMATING SUPPLY DESPITE A QUOTA: BRAZIL'S SUPPLY OF SUGAR

In this paper a model is developed from which the supply curve, of a stochastically produced good, can be estimated when the observations are constrained by a quota. It is shown that, for any (price, quantity) combination observed in the presence of a quota, we can simulate a corresponding (price, quantity) combination which could have been observed in the absence of a quota. This procedure is then employed to construct "free-market" observations on Brazil's supply of sugar, with which the supply curve is then estimated, and production in the absence of sugar quotas inferred.     

Projection and Misperception in Couples Treatment

Projective identification is discussed as an interpersonal mechanism involved in distortions of perceptions and communications. Several case illustrations are presented to show how this mechanism manifests itself in relatively healthy, though neurotic, couples. A treatment approach based on correction of the perceptual distortions is suggested as a model for short-term counseling with such couples.     

Putting modularity in business planning and control

The use of modules in constructing corporate planning systems has been reported by companies such as I.B.M. Xerox, and Standard Oil of New Jersey. The modules may be of organizational units, or of functions such as production, distribution and finance. Modules may also be used for different types of calculations and for generating report output. A module is quite simply a standard unit. Modularity becomes more important as systems grow large, because it is one means of keeping order within large systems. Modularisation is a key concept in structuring large systems, and a useful approach to use in designing procedures for Corporate Planning.     

Alternative Bases of Source Selection

Dans un article précédent nous avons présenté les résultats d'une expérience concue pour mettre à l'épreuve certaines prédictions d'une théorie formelle de la relation interpersonnelle en ce qui à trait a l'émergence des anticipations de conduite lorsque plusieurs sources d'évaluation de cette conduite anticipee sont disponibles a un individu, Dans cet article nous formulons deux alternatives additionnelles qui sont théoriquement plausibles, les multiples prédictions em-piriques qu'elles engendrent, et une évaluation de ces trois formulations particu-lières à la lumière des données existantes. De ces trois formulations, seule la première est appuyee par nos donnees empiriques. Voici de quelle manière elle s'exprime: mis en présence de plusieurs sources d'évaluation l'individu intègre l'ensemble des éléments de l'évaluation plutot que de (a) choisir seu-lement la meilleure source disponible, ou (b) d'utiliser la source la moins bonne comme une ?source négative?, ou encore de se servir de l'évaluation de celui dont l'exactitude ne peut etre mise en doute. In an earlier paper we reported the results of an experiment designed to test certain predictions of a formal theory of interpersonal behaviour concerning the formation of performance expectations when multiple sources of performance evaluation were available to an individual. In this paper we present two additional theoretically reasonable alternative formulations, the different empirical predictions derivable from them, and an evaluation of the three formulations in the light of the existing data. Of the three, only the original formulation received clear empirical support. This formulation holds that when faced with multiple sources of evaluation, the individual combines the evaluations received, rather than (a) selecting only the best source available, or (b) using the lower source as a “negative source,” or someone whose evaluation is so likely to be incorrect as to provide an accurate measure of the correct evaluation.     

Models of gambling and gambling addictions as perceptual filters

Models, in the sense of loosely entertained clusters of beliefs, attitudes, assumptions and expectations which direct the work of researchers and clinicians, also act as perceptual filters, tending to focus the attention of those who use them on certain aspects of reality and relegating to the background or ignoring altogether other aspects of the field of study and action. The central characteristics of social learning and of medical models are briefly reviewed and they are compared as perceptual filters for their distorting effects on research in gambling and in gambling addictions and on intervention strategies for problem gamblers. It is concluded that the exclusive predominance of any one model leads to the impoverishment of both research and intervention.