基于B/S三层架构的ASP.NET系统的代码生成研究

根据B/S信息系统的结构和功能特点,通过对代码生成工具的工作模式的研究,提出了基于MDA模型驱动架构和基于模板的驱动模式相结合的代码生成模式。它包括三种基本的模型:功能模型、对象模型、交互模型。此工具通过这三种基本模型和模板来实现B/S三层构架信息系统的生成,非常适合在迭代开发的项目中使用。     

MD5算法在Web数据库中的应用

随着Web数据库的应用越来越广泛,Web数据库的安全问题也日益突出,保障和加强数据库的安全性已成为目前必须要解决的问题。MD5算法作为一种单向加密算法,由于其加密后的数据难以解密,所以在保障Web数据库的安全性问题上采用MD5算法有着重大的作用与意义。     

利用有限域上典型群几何学构造Cartesian认证码Ⅱ

利用有限域上辛几何、酉几何及正交几何的几种类型的子空间构作了若干个Cartesian认证码,计算了它们的参数.假设编码规则按照一种均匀概率分布选择,那么假冒攻击成功的概率PI和替换攻击成功的概率PS也被计算.     

Individual differences in achievement goals: A longitudinal study of cognitive, emotional, and achievement outcomes

Within achievement goal theory debate remains regarding the adaptiveness of certain combinations of goals. Assuming a multiple-goals perspective, we used cluster analysis to classify 1002 undergraduate students according to their mastery and performance-approach goals. Four clusters emerged, representing different goal combinations: high mastery/performance (i.e., multiple goals), dominant mastery, dominant performance, and low mastery/performance (i.e., low motivation). In a longitudinal analysis over one academic year, the clusters were compared on cognitive appraisals (expected achievement, perceived success), achievement-related emotions (enjoyment, boredom, anxiety), and objective measures of academic achievement (final grade in Introductory Psychology, GPA). The low-motivation cluster demonstrated the least adaptive profile across all outcomes. The multiple-goals, mastery, and performance clusters showed equivalent levels of achievement; however, students in the performance cluster were more psychologically and emotionally vulnerable than the multiple-goals and mastery clusters. Our discussion focuses on the immediate and potentially long-term implications of specific goal combinations for students and educators, with particular attention to understanding the cognitive and emotional vulnerabilities of students in the performance cluster which appear despite satisfactory achievement levels.     

技术大类之间会聚指数测度的理论与方法

基于技术会聚和技术共类分析的理论与方法,提出技术大类之间技术会聚指数测度指标和方法,并对《德温特创新索引》数据库中"化学"、"工程"、"电气与电子"三个技术大类之间的技术会聚指数进行了实证分析。测度方法与指标具有比较广泛的应用性。     

Identifying Unobserved Hazard Functions in Discrete-Time Survival Mixture Analysis

This Monte Carlo simulation adds to the growing body of enumeration index performance research in continuous response variable mixture models by addressing the issue of the performance of these indexes in discrete-time survival mixture analysis (DTSMA) models. Results showed that although all enumeration indexes performed very well in identifying a homogeneous DTSMA model (i.e., k = 1 hazard function in the sample data), the findings also showed that the enumeration indexes performed poorly in identifying the correct number of unobserved hazard functions present in a heterogeneous (i.e., k = 3) DTSMA model. More important, the performance of the enumeration indexes for the heterogeneous DTSMA models did not improve as the sample size, the effect of time-invariant covariates, or adjacent hazard function separation distance increased, which is inconsistent with some previous Monte Carlo simulation results. The limitations of this Monte Carlo simulation study and future empirical investigation possibilities are both discussed.     

反兴奋剂工作中的临时停赛规则评述

临时停赛是反兴奋剂工作中较为常见的管理手段，依托反兴奋剂规则体系的建设，临时停赛规则整体上体现出了一致性和灵活性兼备的特点。但由于《世界反兴奋剂条例》临时停赛条款关键内容的缺失，以及各反兴奋剂组织的反兴奋剂规则补充规定的不完善，临时停赛规则的一致性和灵活性相结合的优势未能获得充分发挥，不利于运动员权利的保护，也影响了国际反兴奋剂工作公平协调地进行。完善临时停赛规则应当强调《世界反兴奋剂条例》与各体育组织、反兴奋剂机构的反兴奋剂规则之间的“分工”，并重点关注临时停赛的适用标准、停止条件、违规后果、时长标准和赔偿规则等问题。我国的临时停赛规则存在实践适用较少、认定标准简单的问题，应当借鉴国际经验进一步完善相关规定，助力我国反兴奋剂事业的发展。     

What troubles early childhood educators in New Zealand: a 20-year cross-sectional study of ethical difficulties in early childhood practice

For more than 20 years, the New Zealand early childhood (EC) sector has had guidance about how to deal with situations of ethical difficulty in daily practice through the ECE Code of Ethics. This paper reports on three surveys undertaken at 10-year intervals that sought to understand EC educators’ experiences of such situations, and how they addressed them within their EC settings. An analysis of educators’ stories of ethically troubling situations from the three data-sets traced shifts and similarities in the content reported, and in how educators responded to these challenges over the two-decade period. We situate this analysis alongside changes in the New Zealand ECE policy context during the same time frame. We argue that a connection exists between the reported situations and teachers’ responses to them, and changes within the policy and professional context of daily EC practice.     

论唐代杖刑制度的发展变化

杖刑是《唐律》规定的五种法定刑罚之一，《唐律》对杖刑制度作了具体规定，但是 唐代杖刑制度在实际执行中出现了许多新的变化。首先是杖刑被广泛用做附加刑；其次，唐供许多死罪被以杖杀的方式执行，杖杀成为绞，斩以外的又一死刑方式，第三，唐供中后期又出现了新的决杖方式即“一顿杖”及脊杖。杖刑在唐代名轻而实重。宋代基本上完全沿用了唐代杖刑制度。     

浅谈C语言学习的一些关键环节

C语言是计算机专业学生必修的一门专业基础课,通过阐述其重要性和对其参考书的选择以及对方法、学习建议等的归纳总结,为计算机专业学生学习C语言提供一些指导和帮助。