一个群签名方案的密码学分析与改进

最近,陈泽文等人提出了一种基于中国剩余定理的群签名方案,该方案的安全性是基于大数分解困难性假设.本文对该群签名方案进行了分析,指出该方案中的大数分解可有效地进行计算,其安全性假设是不合适的,该方案所描述的诸多优越性实质上并不存在.文章同时给出了一个改进方案,在强RSA假设下,改进的方案不仅弥补了原方案的安全缺陷,而且改善了协议的性能.     

Stage of change in self-management of chronic diseases: Psychometric properties of the Chinese version of the University of Rhode Island Change Assessment (C-URICA) Scale.

Objective: The University of Rhode Island Change Assessment (URICA) Scale has been widely used to assess the readiness to change with regard to various health-related behaviors. The present study aimed to develop a Chinese version of the URICA (C-URICA) for measuring the readiness to change of Chinese participants with chronic diseases. Participants: A group of participants (N=101; 87 women and 14 men) in a chronic disease self-management program were asked to complete the C-URICA. Method: The C-URICA was conducted at the baseline, middle, and end of the 6-week program. Changes in self-management behaviors were also measured. Results: Factor analyses revealed a moderate item-to-subscale fit, indicating that structural validity was retained. Item analyses suggested a moderate item quality. The C-URICA subscales can differentially and effectively predict participants' gains in self-management behaviors at the completion of the intervention program. Conclusion: The C-URICA is suitable for use among Chinese patients with chronic diseases. Further studies should explore the generalizability of the results to different diagnostic groups and subgroups among Chinese populations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于超光谱图像的舌体分割算法

舌体分割是实现中医舌诊现代化的一个前提工作,分割质量直接影响舌象诊断的性能.然而由于舌的生理特征比较复杂,舌的形态以及舌与嘴唇的连接各不相同,使得舌体分割比较困难.本文采用超光谱成像系统代替数码相机采集舌图像,并借鉴光谱角度匹配算法,发展了基于超光谱图像的舌体分割算法.这一算法通过光谱角度匹配算法将超光谱舌图像立方体转换成光谱角度立方体,然后采用一维脉冲波形的边沿信息检测出边缘信息,最后实现了舌体的分割.试验表明,这种基于超光谱图像的舌体分割算法可以较为准确地将舌体分割出来.     

Depressed writing: Cognitive distortions in the works of depressed and nondepressed poets and writers.

Previous research has consistently found that poets and writers suffer from higher rates of psychological disturbance than the general population; what is lacking in the research is analysis of the works themselves. This study examined cognitive distortions, a known indicator of depression, in writing samples of 36 eminent depressed authors and 36 eminent nondepressed authors. Results indicate that depressed authors have more cognitive distortions in their writings than nondepressed authors. However, greater significance was found between poets and prose writers, with poets having substantially more cognitive distortions in their works. An interaction effect was found between study group (depressed or control) and medium (poetry or prose) indicating that nondepressed prose writers had significantly fewer cognitive distortions than nondepressed poets, depressed poets, and depressed writers. Differences in gender and time period are explored as well. Findings suggest a general acceptance of depressive thinking and writing for poets that is not present for prose writers. Implications for the effectiveness of writing as a form of psychotherapy are also discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

古建筑设计中单位换算的研究

分析了古建筑设计中由于古尺的消失和古制单位与计算机绘图单位的不匹配而使得古建筑设计所面临的问题.介绍了各个朝代的尺寸与现在公制单位的关系,提出了将古制单位与计算机绘图相结合的解决方法,特别是分析并例举了常用的宋之"材"、"分0"制和清之"斗口"制在计算机绘图中的处理方法,避免了复杂的人工换算,极大地提高了设计效率.也有利于对年轻的古建筑设计人员的培养.     

基于中心驱动模型的宾州中文树库(CTB)句法分析

报告了依托宾州中文树库进行句法分析研究的最新进展.以著名的中心驱动模型为基础,首次在宾州中文树库5.0上进行了句法分析实验.同前人的工作相比,这次实验取得了更加成功的结果,极大缩小了中、英文句法分析的差距.在公共的测试集上对句法分析器的性能进行了评价,对于正确分词和词性标注的句子,句法分析的精确率和召回率分别达到85.89%和85.61%.介绍了模型的实现过程,并进一步分析了模型中决策表和基本名词短语(BNP)两个关键环节在句法分析器中所起到的作用.本文的工作对于研制实用化句法分析系统具有一定参考价值.     

European American and Chinese parents' responses to children's success and failure: Implications for children's responses.

The authors examined cultural differences in parents' responses to their children's performance. In Study 1 (N = 421), Chinese 5th graders reported that their parents de-emphasized their academic success and emphasized their academic failure, whereas their American counterparts reported that their parents did the opposite. This partially accounted for Chinese (vs. American) children responding less positively to success and more negatively to failure. In Study 2 (N = 128), Chinese and American mothers' responses to their 4th and 5th graders' performance were observed in the laboratory. The cultural differences in children's reports of parents' responses documented in Study 1 were replicated; mothers' responses were also associated with children's subsequent performance. In addition, Chinese mothers were more involved than were American mothers, but their affect was similar. Taken together, the results suggest that parents' responses to children's performance may be a channel for cultural transmission and perpetuation of responses to performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

中国画小品的现代审美特性刍议

中国画小品是传统文化的载体，每个时代的小品画都有其独特的文化内涵，始终为各个时期人们的偏爱，符合各个时期人们的审美情趣，展示出强烈的时代精神。     

试析曹丕"诗赋欲丽"

曹丕的“诗赋欲丽”说学界一直以来都有关注,但都浅尝辄止。试图从曹丕“诗赋欲丽”说提出诗赋要讲究文辞华丽之形式美、它被提出的主要缘由、它的划时代的意义,以及它是我国文学进入审美自觉的宣言、引领了魏晋南北朝重形式美的文学风尚等方面进行深入探析。     

氮沉降对杉木人工林土壤盐基离子的影响

在闽北12 a生的杉木人工林中开展模拟氮沉降试验,试验设计为4种处理,分别为N0(0 kg.hm-2.yr-1N,对照)、N1(60 kg.hm-2.yr-1N)、N2(120 kg.hm-2.yr-1N)、N3(240 kg.hm-2.yr-1N).以第3年模拟试验的杉木人工林土壤为研究对象,分析了氮沉降对土壤盐基离子的影响.从相同处理不同土层间比较发现,盐基离子总量及盐基饱和度均随土层深度增加而下降,氮沉降没有改变盐基离子在土壤上下层之间的分布格局.从相同土层不同处理间比较显示,低氮处理增加了杉木人工林土壤K、Na、Mg 3种盐基离子的含量以及盐基离子总量和盐基饱和度,而中、高氮处理则影响较小;高氮处理明显提高了土壤Ca离子含量,但低氮和中氮处理的影响不明显.