When Restrictive Constraints Are Nonbinding: Illustrations and Implications

For convex and concave mathematical programs restrictive constraints (i.e., their deletion would change the optimum) will always be binding at the optimum, and vice versa. Less well-known is the fact that this property does not hold more generally, even for problems with convex feasible sets. This paper demonstrates the latter fact using numerical illustrations of common classes of problems. It then discusses the implications for public policy analysis, econometric estimation, and solution algorithms.     

Faculty Performance Evaluation: Modeling to Improve Personnel Decisions*

Based on likely future changes in faculty evaluation practices, this paper examines how institutions of higher education might operationalize performance evaluation as related to research, teaching, and service. A model is developed that allows coupling performance evaluation and relevant market considerations with merit pay, tenure, and promotion decisions. The approach is specifically applicable to tenure-track faculty members in colleges and universities.     

Sexual identity distress, social support, and the health of gay, lesbian, and bisexual youth

Sex researchers and mental health clinicians have long recognized that the stigma surrounding homosexuality plays an important role in shaping the social psychological adjustment of gay, lesbian, and bisexual (g/l/b) people. In recent years, researchers have suggested that sexual identity- related distress may influence the physical health status of g/l/b people, primarily because of the ways these self-related feelings and beliefs impact patterns of health-related behavior. This study examines the influence of sexual identity distress and social support on g/l/b youth's drug and alcohol use, psychological distress, and risky sexual behavior. The data come from a services research demonstration program conducted at the Indiana Youth Group, Inc., a g/l/b youth development agency based in Indianapolis, Indiana. Results indicate that sexual identity distress is strongly associated with psychological distress, less frequent use of alcohol, and using fewer types of illegal drugs. Being out to more people in one's support network, however, attenuates the severity of youth's sexual identity-related distress. Youth who report more support ties to g/l/b people indicate engaging in more frequent risky sexual behavior. The implications of these findings for theories of g/l/b youth's sexual identity development are discussed.     

Vulnerabilities and risks in population and environment studies

In the study of risks , different sciences use the same category in different ways, each related to its own ontological assumptions. But many of these fields communicate very little with one another. This article seeks to approximate two of these areas of study that have shown similar concerns and that can mutually strengthen one another, namely, geography and demography. Geography was one of the first disciplines to include risk in its environmental dimension and has had broad experience in simultaneously focusing on social and natural dynamics. Demography, on the other hand, faces greater difficulties because only recently has it incorporated the environmental dimension into its scientific scope. Both have brought the concept of vulnerability into their conceptual framework as complementary to that of risk. Geographers understand vulnerability as a more symbiotic form of the relationship between society and nature, whereas demographers give it a strong socioeconomic component. In this regard, the conceptual discussion on risks and vulnerabilities, in its attempt at approximating these two fields, is a way of conceptually advancing and strengthening the different approaches to empirical work, especially in population–environment studies which is the common ground for the dialogue between the two disciplines.

Ferment in LGBT studies and queer theory: personal ruminations on contested terrain

The tensions between queer and gay rights theorists, not surprisingly, have grown as queer theory has developed and matured. In this self-reflexive essay, the "contested terrain" between these distinct perspectives is explored, particularly within the discipline of communication studies. The assumptions of queer theory are summarized briefly, and the author takes an autoethnographic approach to demonstrate the constant interplay between lived experience and the basic assumptions of queer theory. The author challenges both LGBT theorists and queer theorists to always consider the implications of their theories and practices.     

Solution Procedures for the Lot-Streaming Problem

Lot streaming is the process of splitting a job into sublots so its operations can be overlapped and its progress accelerated. We present a computationally efficient procedure for solving the m-machine, two-sublot problem, and we discuss the bottleneck insights that emerge from the analysis. We also examine heuristic approaches for more than two sublots and discuss computational results for these procedures.     

Multi-Item Grouping Algorithm Yielding Near-Optimal Logistics Cost

This article describes an algorithm used to formulate an inbound consolidation strategy when multi-items are replenished in groups and when total logistics cost is to be minimized. The importance of this algorithm is threefold (1) no optimal procedure exists for grouping multi-items when minimizing total logistics cost, (2) a complete enumeration of all possible groups (from which the optimal grouping set can be identified) is impractical due to the combinatorial nature of the grouping problem, and (3) no other heuristics have been developed that adequately reflect shipping cost in the analysis like this one does. We report the experience of using this algorithm to group and reorder 75 selected ensembles containing a total of 517 inventory items of a retail merchandising firm.     

Is a Picture Worth A Thousand Words? An Experiment Comparing Observer-Based Skin Tone Measures

Several different measures of skin color are popular in social science surveys, yet we have little evidence to suggest which method is the most valid or re     

Words and Hugs: Emotional Support for Latino and Asian Children of Immigrants Compared to their White Counterparts with Native-Born Parentage

Previous research highlights parental psychological and personal resources as determinants of children’s emotional support. Less emphasis is placed o     

Addiction science and the perception of freewill

Do people think individuals with Substance Use Disorder (SUD) have freewill? How does addiction science inform views on the issue? We distinguish between two senses of freewill: 1) libertarian freewill , in which freedom turns on a particular metaphysical conception of action (sometimes operationalized as “could have done otherwise”), and 2) compatibilist freewill , in which freedom depends on the relation between the actor's psychology and her actions (e.g., “was the act what she wanted to do?”). We argue that, in different ways, scientific accounts can impact conceived freewill by linking addictive behavior to mechanisms that observers view as peripheral to the actor ( motivation modularity) . While a variety of impacts on conceived compatibilist freewill are plausible, we argue that contemporary addiction science has no direct bearing on conceived libertarian freewill. Addiction science may, however, indirectly impact conceived libertarian freewill by priming an explanatory framework in which intention is superfluous (especially materialism).