Operations research in the management of the airlines

This paper is intended to present an introduction to the use of operations research in the international airline industry, and to demonstrate the scope and significance of the airline OR activities. First, the special reasons for the viability and spread of airline OR are discussed. Then a functional framework for an airline is outlined, to be used in analyzing the problems of an airline and relating the OR work to it. Four major applications are described, corresponding to four major components of the framework. These applications are: schedule development, overbooking control, crew scheduling and engine management, respectively. In each case we describe the problem and its significance, indicate the types of solution techniques which have been developed, and assess the implemented solutions. The paper concludes with comments on the current state-of-the-art and the future of airline OR. A detailed bibliography is given.Both of the authors have been operations research directors in major airlines and more recently have focused their attention upon the industry as academic researchers. This background has provided us with an unusual opportunity to analyze the role of OR in the airlines, and our paper seeks to share with the reader some of the insights we have gained thereby.     

Sexual Coercion within Mixed-Sex Couples: The Roles of Sexual Motives,Revictimization, and Reperpetration

Research suggests that a history of childhood sexual abuse, and previous experiences of sexual coercion, may predict sexual coercion victimization and perpetration. More recently, sexual motivation has been found to correlate with both consensual and non-consensual sexual activity. However, sexual motivation has not been examined in association with previous experiences of abuse and sexual coercion. The aim of this study was to investigate childhood sexual abuse, previous sexual coercion experiences, and sexual motives of both partners as possible risk factors for current sexual coercion victimization and perpetration within a sample of 209 mixed-sex couples. This study examined whether power, stress relief, partner pressure, and imposition motives contributed unique variance to the prediction of sexual coercion beyond that accounted for by past childhood sexual abuse and sexual coercion events. Using hierarchical logistic regressions, four predictive models were examined for both male and female sexual coercion perpetration and victimization. Results show that childhood sexual abuse was only a significant predictor of female sexual coercion perpetration, whereas male sexual coercion victimization and perpetration were predicted by sexual coercion victimization and perpetration in previous relationships. Power motives were also significant predictors of sexual coercion perpetration, and imposition was a significant predictor of sexual coercion victimization for both genders.     

股东参与治理的私人收益和社会收益的实证研究

本文探讨了股东参与治理所带来的私人收益、特定股权结构的社会收益以及股权集中成本三者之间的关系。我们分析的结果表明,当股东与经理人员之间的利益冲突水平较高、其它治理机制的作用较弱时,股权集中(股东参与治理的积极性较高)可以创造大量的社会收益;反之,股权的集中与分散程度(股东参与治理的积极性较低)对社会收益的影响不明显。本文的研究结论为我国股东参与治理及股权结构改革提供了重要启示。     

Sexual coercion within mixed-sex couples: the roles of sexual motives, revictimization, and reperpetration

Research suggests that a history of childhood sexual abuse, and previous experiences of sexual coercion, may predict sexual coercion victimization and perpetration. More recently, sexual motivation has been found to correlate with both consensual and non-consensual sexual activity. However, sexual motivation has not been examined in association with previous experiences of abuse and sexual coercion. The aim of this study was to investigate childhood sexual abuse, previous sexual coercion experiences, and sexual motives of both partners as possible risk factors for current sexual coercion victimization and perpetration within a sample of 209 mixed-sex couples. This study examined whether power, stress relief, partner pressure, and imposition motives contributed unique variance to the prediction of sexual coercion beyond that accounted for by past childhood sexual abuse and sexual coercion events. Using hierarchical logistic regressions, four predictive models were examined for both male and female sexual coercion perpetration and victimization. Results show that childhood sexual abuse was only a significant predictor of female sexual coercion perpetration, whereas male sexual coercion victimization and perpetration were predicted by sexual coercion victimization and perpetration in previous relationships. Power motives were also significant predictors of sexual coercion perpetration, and imposition was a significant predictor of sexual coercion victimization for both genders.     

The Sexual Consent Scale–Revised: Development,Reliability, and Preliminary Validity

The Sexual Consent Scale–Revised (SCS–R) measures an individual's beliefs, attitudes, and behaviors with respect to how sexual consent should be and is negotiated between sexual partners. This study extends previous research on sexual consent by revising a scale using the Theory of Planned Behavior (Ajzen, 1991 Ajzen , I. ( 1991 ). The Theory of Planned Behavior . Organizational Behavior and Human Decision Processes , 50 , 179 – 211 .[Crossref], [Web of Science ®] , [Google Scholar], 2001 Ajzen , I. ( 2001 ). Attitudes . Annual Review of Psychology , 52 , 27 – 58 .[Crossref], [PubMed], [Web of Science ®] , [Google Scholar], 2005 Ajzen , I. ( 2005 ) . Attitudes, personality, and behavior ( , 2nd ed. ). Milton-Keynes , England : Open University Press/McGraw-Hill . [Google Scholar]) as its theoretical foundation. The psychometric properties of the SCS–R were established using factor analysis, construct validity tests, as well as internal consistency and test–retest reliability. Five factors emerged: perceived behavioral control, positive attitude toward establishing consent, sexual consent norms, indirect consent behaviors, and awareness of consent. Results indicated that the SCS–R can be useful for examining a variety of research questions relating to sexual consent.