后控规范的计算机处理

分析了建立情报检索系统时受控主题标引的不足之处：标引效率低、语义网得不到扩充、不一致的组配标引。提出了以后控规范为基础的标引体系。为使后控规范能方便地由计算机实现，研究了利用相似性匹配技术找出语义上有一定联系的术语，并由计算机半自动地建立用、代、属、分、参等语义关系的方法。     

New library buildings: the University of Michigan Medical Library and Learning Resource Center

The University of Michigan opened a new medical library in July 1980. The five-story structure combines the library with a learning-resources center. Overall, the building has operated smoothly and has been well accepted. The combining of two facilities designed to support the teaching and learning objectives of the health sciences curriculum will ensure long-term cooperation between them.     

Effects of adding a preceding run-up on performance, blood lactate concentration and heart rate during maximal intermittent vertical jumping

In this study, we examined the effects of a prior run-up on intermittent maximal vertical jump performance. Seven regionally ranked male volleyball players volunteered to participate in the study. They performed three randomized tests: (1) six repeated intermittent maximal jumps (jump condition), (2) six repeated intermittent run-ups (run-up condition), and (3) six repeated run-ups followed by maximal jumps (run-up plus jump condition). All performances were assessed and blood lactate concentration and heart rate were measured before and after each of the tests. Mean ( +/- ) jump performance (64.7 +/- 2.3 cm) increased significantly (P = 0.02) over the course of the jump condition and was significantly higher (P < 0.001) than for the run-up plus jump condition (58.0 +/- 3.2 cm), which tended to decrease with repetition. Blood lactate concentration was significantly higher in the run-up plus jump condition (3.73 +/- 0.24 mmol . l(-1)) than in the jump (2.61 +/- 0.26 mmol . l(-1), P = 0.02) and run-up (2.86 +/- 0.18 mmol . l(-1), P = 0.03) conditions. The increase in heart rate was significantly higher both in the run-up plus jump condition (33 +/- 6 beats . min(-1), P = 0.05) and run-up condition (33 +/- 4 beats . min(-1), P = 0.02) than in the jump condition (21 +/- 3 beats . min(-1)). The results indicate that the addition of run-ups probably impeded performance in the repetition of vertical jumps.     

Web环境下企业竞争对手情报收集方法分析

随着互联网的发展,基于网络环境下的竞争对手情报的收集显得尤为重要。本文主要介绍了目前比较常用的基于网络环境下的竞争对手情报收集的方法以及强调网络环境下对竞争对手情报的收集的重要性。     

基于MVC的大学英语自主测试系统设计与实现

随着信息技术的不断发展,利用信息技术来辅助传统形式的教学显得越加重要。怎样用现代信息技术来提高教育水平,已是现代教育研究的重要课题。如今自主测试已经成为大学自主学习中一个重要的环节,本文主要叙述了基于MVC框架的大学英语自主测试系统的技术原理和功能模块,为实现自主测试系统提供了一个解决方案,给自主学习者带来了方便。