网络虚拟实验中二进制数据的XML传输方法

网络虚拟实验中二进制数据的XML直接传输方法存在节点数目多,解析困难,不利于网络传输等问题.针对上述情况,采用XML的CDATA域封装的方法对二进制数据进行传输.为了解决由ASCII字符引起的语法错误以及CDATA域的异常结束问题,通过Base 64编码技术对二进制数据进行处理.通过一个虚实结合的球杆系统网络虚拟实验对上述方法进行了验证.     

医学期刊的网络化现状与发展

文章分析了我国医学期刊网络化的意义、现状与问题，提出网络化不仅是医学期刊也是出版业发展的必然趋势，应该转变观念，加速人才培养，健全政策法规，统一技术标准，促进我国医学期刊网络化进一步发展。     

An analysis of human factors and label accuracy in crowdsourcing relevance judgments

Crowdsourcing relevance judgments for the evaluation of search engines is used increasingly to overcome the issue of scalability that hinders traditional approaches relying on a fixed group of trusted expert judges. However, the benefits of crowdsourcing come with risks due to the engagement of a self-forming group of individuals—the crowd, motivated by different incentives, who complete the tasks with varying levels of attention and success. This increases the need for a careful design of crowdsourcing tasks that attracts the right crowd for the given task and promotes quality work. In this paper, we describe a series of experiments using Amazon’s Mechanical Turk, conducted to explore the ‘human’ characteristics of the crowds involved in a relevance assessment task. In the experiments, we vary the level of pay offered, the effort required to complete a task and the qualifications required of the workers. We observe the effects of these variables on the quality of the resulting relevance labels, measured based on agreement with a gold set, and correlate them with self-reported measures of various human factors. We elicit information from the workers about their motivations, interest and familiarity with the topic, perceived task difficulty, and satisfaction with the offered pay. We investigate how these factors combine with aspects of the task design and how they affect the accuracy of the resulting relevance labels. Based on the analysis of 960 HITs and 2,880 HIT assignments resulting in 19,200 relevance labels, we arrive at insights into the complex interaction of the observed factors and provide practical guidelines to crowdsourcing practitioners. In addition, we highlight challenges in the data analysis that stem from the peculiarity of the crowdsourcing environment where the sample of individuals engaged in specific work conditions are inherently influenced by the conditions themselves.     

Effect of ocimum flavonoids as a radioprotector on the erythrocyte antioxidants in oral cancer

Flavonoids extracted from the leaves of Indian holy basil, Ocimum sanctum showed promising results as radioprotector in rodents. Hence it was thought pertinent to analyze the antioxidants of erythrocytes in oral cancer patients who were concurrently treated with radiation and ocimum flavonoids. Oral cancer patients consisted of 2 groups. Group A (n=17) received radiation alone while Group B(n=17) received radiation and ocimum flavonoids(OF). Samples of heparinised blood were collected prior to treatment, 15 and 30 days respectively after treatment. Blood from normal healthy volunteers were taken as controls (n=25). Erythrocytes were analyzed for the antioxidants viz. glutathione, glucose 6 phosphate dehydrogenase, glutathione peroxidase and superoxide dismutase by the standard methods. Results of analysis indicated that erythrocytes from cancer patients (Group A and B) had significantly high glutathione levels before as well as after treatment compared to controls. It was observed that Group B which received OF showed a significant reduction in glutathione levels in comparison with Group A. All the other parameters showed no statistical significant changes. Results of the study suggest that erythrocytes from cancer patients responded to oxidative stress by elevating glutathione levels, while a decrease in glutathione levels observed in Group B, could be due to the free radical scavenging effect of OF, sparing the glutathione. However OF did not seem to exert its effect on other antioxidants of erythrocytes.     

Formulating secondary-level reading interventions

Recent advances concerning emerging/beginning reading skills, positive behavioral support (PBS), and three-tiered schoolwide prevention models combined with federal mandates (i.e., IDEA and No Child Left Behind) have stimulated interest in providing early and intensive instructional intervention services to children at risk for reading and behavior problems. New measures for identifying students as early as kindergarten who are not acquiring early basic literacy skills make this possible. However, questions regarding exactly how to formulate, deliver, sustain, and manage secondary-level interventions remain to be addressed. This paper describes first-year, first-grade findings for students participating in secondary-level interventions (i.e., small-group reading instruction) in a randomized trial of the efficacy of secondary and tertiary reading and behavior interventions under way at the Center for Early Intervention in Reading and Behavior, University of Kansas. The formulation of the experimental secondary-level intervention was guided by evidence supporting the efficacy of (a) small groups of 3 to 6 participating students and low student-teacher ratio combined with (b) explicit, phonics-based instruction. Selected curricula were Reading Mastery, Proactive Reading, Programmed Reading, and Read Well, use of which varied by choice across experimental-group schools. PBS was an additional intervention context in experimental schools. Comparison schools and first-grade teachers did not employ the three-tiered model, early screening, or PBS; most students were taught using conventional whole-group instruction, little or no individualization, and curricula with weak scientific evidence. Initial results indicate significantly larger growth for experimental secondary-level at-risk students than for comparisons. Experimental-group first graders not showing growth were those identified with disabilities or behavioral risks and English language learners. Implications are discussed.     

芝加哥公立学校教师流失的影响因素及对策分析

优质、稳定的教师队伍是学生学习的保障,美国为应对教师流失付出了沉重的代价。以芝加哥公立学校为代表,从学校管理层面的研究发现:影响教师流失的因素可归为学校结构、教师自身特点、学生特点和工作氛围4个维度。学校要稳定教师队伍提供有质量的教师,需加强对新任教师引导项目的投入和关注;创建良好的工作氛围以吸引教师留下;协助教师提升课堂管理能力等。这对于目前我国学校如何保证优质、稳定的教师队伍有一定借鉴意义。     

Monolingual Document Retrieval for European Languages

Recent years have witnessed considerable advances in information retrieval for European languages other than English. We give an overview of commonly used techniques and we analyze them with respect to their impact on retrieval effectiveness. The techniques considered range from linguistically motivated techniques, such as morphological normalization and compound splitting, to knowledge-free approaches, such as n-gram indexing. Evaluations are carried out against data from the CLEF campaign, covering eight European languages. Our results show that for many of these languages a modicum of linguistic techniques may lead to improvements in retrieval effectiveness, as can the use of language independent techniques.