On computing a buy/copy policy using the Pitt-Kraft model

The Pitt-Kraft model of buying versus photocopying results in a small, but complex, nonlinear program. This paper identifies a Kuhn-Tucker point and demonstrates that for certain parameter values it is not optimal. A policy generation procedure is presented; the purpose is to prevent convergence of a primal algorithm to this inferior policy, which satisfies the Kuhn-Tucker optimality conditions.     

Academic stress of international students attending U.S. universities

This study investigated factors associated with the academic stress experienced by international students (N=412) attending graduate school in the United States. The study was grounded in a cognitive framework in which academic stress is understood as the consequence of students' appraisal of the stressfulness of role demands and their perception of their ability to cope with those demands. These two appraisals, in turn, were posited to be a function of cultural distance, students' social support network, and their role competencies. Results indicated that the primary determinants of the two types of appraisals differed. While self-perceived English-language skills and, to a lesser degree, cultural distance were the predictors of primary appraisal, self-perceived English-language, academic, and problem-solving skills and social support network were the main determinants of secondary appraisal. Implications for how universities might work more effectively with international students are discussed.     

Research abstracts

Abstracts are compiled by Nancy R. Preston, ERIC Clearinghouse on Information Resources, Syracuse University, Syracuse, NY 13244-2340. Telephone: 315-443-3640. Internet: ERIC@SUVM.SYR.EDU.     

Diurnal patterning of eight activities in 14 species of muroid rodents

The diurnal patterning of locomotion, stereotypy, grooming, eating, drinking, sleeping, postural readjustment, and inactivity was studied in 14 species of muroid rodents in the laboratory using a visual observation technique.Microtus canicaudus, M. montanus, M. ochrogaster, andM. pennsylvanicus exhibited acyclic activity patterns, whilePeromyscus eremicus,P. gossypinus, P. leucopus, P. maniculatus bairdi, P. polionotus, Calomys callosus, Mus musculus, andOnychomys leucogaster displayed nocturnality in their behavioral patterning.Rhabdomys pumilio exhibited crepuscular activities andNeofiber alleni displayed a complex pattern of nocturnality. Species differed in total amount of time spent per day for all activities but eating. The acyclicity ofMicrotus species appears to be related to high metabolic rates and a semifossorial life-style.     

Achieving the educational standards we need

This article is based on remarks presented by Donald M. Stewart at the Open Forum on National Standards held at the Second National Conference on School/College Collaboration, cosponsored by the American Association for Higher Education and the College Board in Atlanta, Georgia, on July 26, 1991.     

Using Internet delivered video cases,to support pre-service teachers' understanding of effective early literacy instruction: An exploratory study

This preliminary study explores the effects ofusing CTELL (Case Technologies EnhancingLiteracy Learning) cases on preserviceteachers' learning. Students participated inone of three instructional treatments:traditional, traditional plus video, andtraditional plus CTELL cases. A pre-postconcept web, describing students' understandingof effective reading instruction, served as themajor outcome measure. This was supplementedwith a unidimensional confidence measure,journal entries, and student interviews. Nosignificant differences were found for any ofthe three treatment conditions on the conceptmapping task or the confidence measure.However, the journal entries and interview datahighlight important issues, challenges andbenefits, with respect to the use of multimediacases. Implications for teacher education areexplored.