基于RS-485的计算机监控网络的开发

分布式控制系统广泛应用于工业生产过程中。文章设计了一种分布式的采用令牌总线机制的小型计算机监控网络，重点介绍了网络通信的设计与实现过程。     

Information Nation: Education and Careers in the Emerging Information Professions by Jeffrey M. Stanton,Indira R. Guzman,and Kathryn R. Stam

The Future Voices in Public Services column is a forum for students in graduate library and information science programs to discuss key issues they see in academic library public services, to envision what they feel librarians in public service have to offer to academia, to tell us of their visions for the profession, or to tell us of research that is going on in library schools. We hope to provide fresh perspectives from those entering our field, in both the United States and other countries. Interested faculty of graduate library and information science programs, who would like their students' ideas represented in these pages, are invited to contact Nancy H. Dewald at nxd7@psu.edu.

Marissa K. Mason is an MSIS student specializing in archives and records management at the University at Albany's Department of Information Studies. In this essay, she discusses the opportunities and challenges of using various social media for promotional outreach of archives and special collections.

The University at Albany's Department of Information Studies, part of the College of Computing and Information, offers a broad-based Master of Science in Information Science degree accredited by the American Library Association. The program has concentrations in library and information services, archives and records administration, school library media, information management and policy, and information systems and technology. Students learn how information is created, organized, represented, stored, accessed, retrieved, managed and used. In addition, they investigate the uses and impacts of information and technology on individuals, organizations and society, including formal and informal communities, libraries, government, and business. A required internship course helps ensure that the program's graduates are ready to enter the world of information professionals. For more information, see http://www.albany.edu/informationstudies/index.php

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Effect of a pilot multi-component intervention on motor performance and metabolic risks in overweight/obese youth

This study evaluated the effect of a multi-component intervention on motor performance (MP) and metabolic risk markers (MRM) in overweight/obese youth. A secondary aim was to examine whether changes in MP are associated to changes in MRM. A 3-month multi-component intervention was performed, consisting of physical exercise sessions (twice/week;1h), nutritional education sessions (once/month), and parental support (twice/week). The sample included 35 volunteers (7–13 y.o), allocated to intervention (INT, n = 17) and control (CONT, n = 18) group. Variables were measured pre (T0) and post intervention (T1). Fasting blood samples were analyzed for MRM. MP tests included the measurement of health related physical fitness components and motor coordination performance (KTK battery). To assess food intake, a 24-hour recall diary was used. GLM-ANCOVA was performed. Standardized scores were calculated for the outcome variables, and multilinear regressions were applied to analyze associations between the key variables. INT group showed improvements in MP, glycolytic and hepatic profiles. After adjustments for MVPA, SB, total intake and maturational stage, negative associations between %ΔMP and %Δglycolytic (β = -.424; 95%CI:-0.343:-0.022), and %Δhepatic scores (β = -.382 95%CI:-0.001:-0.009) were observed. The intervention produced a moderate-to-high effect on the MP and some MRM. Changes in MP were inversely associated with changes in glycolytic and hepatic markers.     

Development and validation of a theoretically based,multidimensional questionnaire of student evaluation of university teaching

The authors describe the development and validation of a multidimensional instrument of students’ evaluation of university teaching (the Pedagogical Questionnaire of the University of Porto). The goal was to develop an instrument based on a sound psychometric analysis and simultaneously supported by the learning theory. Based on the data from 4875 questionnaires, the present study examined the fit of the proposed multidimensional model of university teaching to the whole sample and to various specific university programmes of study using confirmatory factor analysis (AMOS 5.0). Results clearly supported the applicability of the proposed model for the whole university and across programmes of study, demonstrating the validity and reliability of the instrument in evaluating several distinct dimensions of the quality of university teaching.     

A longitudinal developmental analysis of students’ causality beliefs about school performance

This study examined the development of school-related causality beliefs which are children’s generalized perceptions of the utility or power of different categories of specific means in producing school outcomes. Based on the action theory perspective, we analyzed the developmental model of these beliefs as well as the trajectories of the five perceived causes of school success and failure: ability, effort, luck, teacher’s help, and unknown causes. On a 5-year longitudinal study, following a group of 63 students over an 8-year period (from the second to the ninth grades), using hierarchical linear models, intraindividual changes and interindividual differences in these changes were identified; also, factors that might account for this variability were tested. The results showed a decrease of the effectiveness attributed to the various causes, but their differentiated trajectories, and a relative independence of gender and achievement factors (engagement and school grades) in the evolution of these beliefs. School children in the lower grades value most highly ability and effort as causes of school success. Student’s beliefs about the causes of school performance become both more conservative and more differentiated along schooling, which is probably a normative general tendency. Findings from this longitudinal study corroborate, to a large extent, a consistent set of important developmental findings based on previous cross-sectional designs.     

Factors Influencing Word-of-Mouth Recommendations by MBA Students: An Examination of School Quality,Educational Outcomes,and Value of the MBA

Word-of-mouth recommendations from current students are an important source of influence when prospective MBA students are selecting a school. Based on a sample of 16,297 graduating MBA students, this paper uses multiple regression analysis to identify the factors that affect a school recommendation and to assess their relative importance. Separate models are developed based on prior research on service quality, educational outcomes, and perceived equity; then, variables from the separate models are combined into an overall model. Implications are discussed for school administrators and the marketing professionals who support them.