In the eye of the beholder: The relationship between perceived peer language skills,provided peer feedback and peer grading in secondary education

Students involved in peer assessment have interpersonal relationships, partly consisting of reciprocal perceptions. In the domain of argumentative writing, little is known about the way peer assessment is affected by the assessor’s perception of the assessee’s language skills. Dutch 10th grade students (N = 176, age = 15–16) provided feedback and grades on two texts, being under the illusion that the texts had been written by two classmates whom the assessors perceived as a peer with either stronger or weaker language skills than their own (within-subjects design). In reality, students assessed similar texts, created by the researchers. Assessors did not provide different feedback to the two types of assessees. Simultaneously, they provided higher grades to peers perceived to have stronger language skills than their own than to peers perceived to have weaker language skills than their own. Future research should capture assessors’ rationale behind the composition of feedback and grades.     

The impact of two types of peer assessment on students' performance and satisfaction within a Wiki environment

The purpose of this study was to compare the effects of two peer assessment methods on university students' academic writing performance and their satisfaction with peer assessment. This study also examined the validity and reliability of student generated assessment scores. Two hundred and thirty-two predominantly undergraduate students were selected by convenience sampling during the fall semester of 2007. The results indicate that students in the experimental group demonstrated greater improvement in their writing than those in the comparison group, and the findings reveal that students in the experimental group exhibited higher levels of satisfaction with the peer assessment method both in peer assessment structure and peer feedback than those in the comparison group. Additionally, the findings indicate that the validity and reliability of student generated rating scores were extremely high. Using Wiki interactive software and providing an online collaborative learning environment to facilitate peer assessment added value to peer assessment.     

P2P网络中BitTorrent系统协议分析

点对点网络（P2P）指网络用户之间可以直接通信的网络结构。P2P使用户可以直接连接其他用户的计算机,而不是像过去那样连接到服务器去浏览和下载。介绍BitTorrent在P2P网络中的作用,对BitTorrent系统中涉及的torrent文件格式、节点与tracker之间的通信协议以及节点之间的通信协议进行分析。     

Self-regulation of peer feedback quality aspects through different dimensions of experience within prior peer feedback assignments

Although peer review is a widely-used pedagogical technique, its value depends upon the quality of the reviews that students produce, and much research remains to be done to systematically study the nature, causes, and consequences of variation in peer review quality. We propose a new framework that conceptualizes five larger dimensions of peer review quality and then present a study that investigated three specific peer review quality constructs in a large dataset and further explored how these constructs change through different types of self-regulation peer reviewing experiences. Peer review data across multiple assignments were analyzed from 2,092 undergraduate students enrolled in one of three offerings of a biology course at a large public research university in the United States. Peer review quality was measured in terms of comment amount, comment accuracy, and rating accuracy; the measures of reviewing experience focused upon self-regulated learning factors such as practice, feedback, others’ modeling, and relative performance. Meta-correlation (for testing reliability, separability, and stability) and meta-regression (as a time-series analysis for testing the relationship of changes across assignments in reviewing quality with experiences as reviewer and reviewee) are used to establish the robustness of effects and meaningful variation of effects across course offerings and assignments. Results showed that there were three meaningful review quality constructs (i.e., were measured reliably, separable, and semi-stable over time). Further, all three showed changes in response to previous reviewer and reviewee experiences, but only feedback helpfulness, in particular, showed effects of all four examined types of self-regluation experiences (practice, feedback, others’ modeling, and relative performance). The findings suggest that instructors can improve review quality by providing comment prompt scaffolds that lead to longer comments as well as by matching authors with similarly performing reviewers.     

Friends, classmates, and self-regulated learning: discussions with peers inside and outside the classroom

The current study sought to understand the relationship between peer discussions and self-regulated learning. Eighty-eight first year high school students answered questions from the Motivated Strategies for Learning Questionnaire and reported the perceived frequency of discussions with peers both inside and outside of the classroom regarding self-regulated learning. Results suggest that differences exist between the frequency of self-regulation discussions with peers from inside and outside of the classroom, especially for discussions concerning motivation. Discussions with peers outside of class were related more closely to students’ reported self-regulated learning than discussion with peers inside of class. In addition, peer groups with higher average levels of self-regulated learning discussions had individual members with high reported self-regulated learning. The study’s results also highlight the need for further research on the mechanisms by which peer discussions may relate to students’ self-regulated learning.     

SIP代理服务器的自组织组网技术

在分析了集中式SIP代理服务器组网技术的基础上，提出采用P2P组网模式解决大规模SIP应用的难题，并给出了初步的体系结构设计和性能分析结果。     

A pernicious cycle: Finding the pathways from child maltreatment to adolescent peer victimization

The purpose of this study was to identify the pathways from childhood physical and sexual abuse to adolescent physical and sexual victimization by assessing behavior symptoms (both internalizing and externalizing) and peer popularity as potential mediating variables. The data derive from Longitudinal Studies of Child Abuse and Neglect (LONGSCAN), which tracks the consequences of child abuse and neglect using five study sites across the US. Child physical and sexual abuse was measured at age 12 using self-reports of life-time maltreatment experiences. Internalizing and externalizing symptoms were assessed at age 12 using the Child Behavior Checklist (CBCL). Peer popularity was assessed at age 14 by teachers. Peer victimization was assessed at age 16 using the modified version of the Juvenile Victimization Questionnaire. The results indicated that physical abuse had no direct effect on either physical or sexual peer victimization, whereas sexual abuse had significant direct effect on both physical and sexual victimization. Assessed at age 12, children who had been physically or sexually maltreated were found to have higher levels of internalizing and externalizing symptoms. These increased symptoms are associated with lower peer popularity at age 14, which in turn is associated with greater physical and sexual peer victimization at age 16. The findings suggest that multiple points for interventions may exist to disrupt the cycle of victimization. Early assessment and treatment for externalizing symptoms and for low peer popularity may be helpful in preventing physical peer victimization among adolescents who have been physically and/or sexually abused.     

Peer mediation: citizenship and social inclusion revisited

In sociometric research tradition, popularity is defined as the degree to which children are liked or accepted by their peers. However, research indicates that two definitions of popular students should be distinguished: (1) popular students as those students who are well liked by many and disliked by few peers, and (2) popular students as those students who are described as popular by their peers. The main purpose of the present study was to examine the relationship between sociometric and peer perceived popularity in Slovenian students of different grades of elementary and secondary school. Additionally, the age differences in the relationship between sociometric and peer perceived popularity were examined. Another purpose of the study was to investigate the differential relationships between concepts of popularity and some students' characteristics. The participants were 321 boys and 329 girls who ranged from the 5th grade of elementary school (the mean age 11.04 years) to the 3rd grade of secondary school (the mean age 17.02 years). The results of this study confirm previous findings that peer perceived popularity is a construct that is distinct from sociometric popularity. There are some substantial differences in relations between indices of perceived popularity and sociometric indices between elementary school students and secondary school students—i.e. between early adolescents and middle to late adolescents. It seems that perceived popularity and sociometric popularity are rather similar constructs in elementary school students, whereas in secondary school students they become almost unrelated to each other. Based on these findings, the terminological issues are discussed and some conclusions are made.     

P2P流媒体系统概述

P2P技术的出现,使低成本的分布式服务成为可能。参与的用户既是服务的消费者,又是服务的提供者,这种特性尤其适合流媒体系统。P2P技术将集中的流媒体服务分散化,从而消除了传统系统的瓶颈,拓展了网络视频业务的应用范围。     

Investigating secondary school students’ unmediated peer assessment skills

The purpose of this study was to investigate secondary school students’ unmediated peer assessment skills. Specifically, 36 seventh graders, without receiving any kind of support, were anonymously assigned to reciprocally assess their peers’ science web-portfolios. Additionally, students’ attitudes towards and intentions about the use of unsupported reciprocal peer assessment were examined. Three data sources were used, namely, interviews, screen-video captured data, and the peer assessors’ feedback produced. Findings showed that the students have positive attitudes towards unsupported reciprocal peer assessment and that they intend to implement it again. It was also found that students have the skills, at least the beginnings, needed for the implementation of peer assessment. Specifically, they were found to be able to define and use their own assessment criteria, whose overall validity and reliability, however, were found to be low. Finally, the feedback they produced included grades, positive and negative judgments, as well as suggestions for changes.     

基于同群效应的美国班级规模研究述评

美国关于班级规模的研究和实践由来已久。早期主要集中于班级规模的缩减、班级规模对于学生学习成绩的影响及小班对学生的阅读和数学、行为、入学率以及个性发展等方面产生的作用。在班级规模的研究中引入同群效应理论,是在以往研究基础上的创新,打破了传统的班级越小越好的观点,给我国的班级规模研究带来了极大的启发。     

What Students Think and Do in Classroom Teams When Peer Evaluations Are Highly Consequential: A Two‐Stage Study

The article presents findings from a two‐stage study that examined student perceptions of peer evaluations (PEs) conducted in undergraduate business classroom teams. In stage 1, we used qualitative research to identify constructs focal in students’ PE‐related cognitive schemas and developed grounded measurement scales and hypotheses about their relationships. Then, we implemented PEs in 17 sections of undergraduate business courses taught over seven semesters. The PEs were highly consequential; i.e., they entirely determined the grade each student received on her/his team project. At the end of each semester, we surveyed student perceptions and behaviors using measurement scales we developed after stage 1 of the study. We find that the knowledge of impending PEs leads students to exercise a great deal of care in terms of what they say and do while working with others. The higher levels of care trigger both impression management behaviors and perceptions that others are contributing more. The perceptions that others are contributing more seem instrumental in shaping students’ decision to contribute more themselves. Implications for instructors and future research are discussed.     

Interactive learning through web-mediated peer review of student science reports

Two studies analyzed impacts of writing and receiving web-mediated peer reviews on revision of research reports by undergraduate science students. After conducting toxicology experiments, 77 students posted draft reports and exchanged double-blind reviews. The first study randomly assigned students to four groups representing full, partial, or no peer review. Students engaging in any aspect of peer review made more revisions than students confined to reviewing their own reports. In the second study, all students engaged in peer review, and the influence of writing versus receiving critiques was analyzed using linear regression. Both studies showed receiving reviews to be more significant than writing them in terms of triggering report revisions. Students valued the peer review experience and credited it with giving them insights about their work. Conclusions address implications for optimal design of online peer review systems and for further research into student learning gains.

Evaluating the effectiveness of supplemental instruction using a multivariable analytic approach

Supplemental instruction (SI) is a widely implemented peer-led academic support program. Assessments of SI's effectiveness are often confounded by student ability, achievement, motivation and demographic characteristics, and frequently limited by available resources. We modelled the impact of SI attendance on the grades, pass rates and retention of over 4000 university students. Percentage grade increases of up to 10.4% were associated with a full semester of SI attendance, and largest for males, younger students and those who had not previously engaged with the program. Furthermore, pass rates were 10% higher for full attendees. Finally, full attendance was associated with a 3% and 9% increase in the probability of reenrolling the following year for students who had and had not previously engaged, respectively. These estimates were calculated controlling for measures of ability, achievement and motivation, plus several demographic factors. Our methods can be applied to evaluate any opt-in academic support program.     

Preschool Routines,Peer Learning and Participation

The aim of this study was to examine what children learn spontaneously from each other in everyday activities within the preschool culture. It involves an interpretation and analysis of specific situations, which focus on the spontaneous learning that occurs in children's actions and communication . Everyday activities in preschool are associated with routines in situations like meals, circle time and play activities. In these situations children have opportunities to learn about rules, ways of acting, routines, codes and discursive practices; knowledge and skills which are often tacit but which children learn from each other through social practices.     

Formative observation of teaching: focusing peer assistance on teachers’ developmental goals

Peer observation of teaching can provide valuable insights into effective educational practices. By adopting a developmental focus, peer observation can also provide insights into how practices might be enhanced and, importantly, how enhancements in practices might be aligned to teachers’ development goals. However, a review of peer observation of teaching undertaken at Australian universities demonstrates that observation instruments and protocols typically do not explicitly afford alignment of peers’ observations with teachers’ developmental goals. Analysis of observers’ uses of popular peer observation instruments through the deployment of the Peer Assisted Teaching Scheme through multiple institutions across Australia has informed the development and trial of a novel observation instrument and protocol design that is aligned with observer use characteristics, and provides a focus on development goals. This study will be of interest to teachers and academic developers researching and implementing goal-oriented curricular and pedagogical development through peer observation.     

The protective role of teacher–student relationships against peer victimization and psychosocial distress

This study examined whether teacher–student relationships protect against peer victimization and its negative psychosocial effects (i.e., depression, anxiety, and stress). Additionally, the influence of teacher–student relationships, peer relationships, and students’ perceptions of school order and discipline was investigated as these variables were expected to be negatively related to the former. Data were collected from high school‐aged adolescents (N = 539; 51% female) in the U.S. Southwest. Study results indicate that teacher–student relationships buffered against experiencing psychosocial distress associated with peer victimization. Although positive teacher–student relationships, peer relationships, and students’ perceptions of school order and discipline all were negatively associated with peer victimization and psychosocial distress, teacher–student relationships were robustly related to peer victimization and psychosocial distress over the influence of the previous variables. In other words, as a key study finding, teacher–student relationships may reduce the impact of peer victimization by mitigating its negative psychosocial effects in a robust yet relatively unexplored way. Therefore, although more research is needed, fostering positive teacher–student relationships might be an effective way to reduce peer victimization as well as its negative effects.     

Behavioral and relational correlates of low self-perceived competence in young children

It is developmentally normative for preschoolers (aged four to five years) to have self-perceptions that are typically positive and even over-inflated. However, because not all children have positive self-perceptions in early childhood it is important to understand factors that influence the development of self-perceptions, especially low self-perceptions, in early childhood. Therefore, this study examined the associations between self-perceptions and teacher ratings of social behaviors, subtypes of withdrawal, and peer ratings of acceptance/rejection in preschoolers. Participants included 199 children (107 males, 92 females) attending two early childhood programs in a midsized community in the western United States. The major findings were that children in early childhood who have lower self-perceptions of their abilities than their peers tended to engage in more reticence, solitary-passive withdrawal, and solitary-active behavior.