Appropriation of a shared workspace: Organizing principles and their application

The use and effects of a CSCL-tool are not always predictable from the properties of the tool alone, but depend on how that tool is appropriated. This paper presents the findings from a case study about the appropriation of a graphical shared workspace. When students are presented with a new tool they may encounter competing constraints and multiple possibilities for interacting with it. We argue that during critical events the students make choices, and in order to collaborate, coordinate these choices as a group. We study appropriation by looking into the ways in which small groups organize their contributions during a computer-mediated argumentative discussion. The results of our study illustrate how certain principles for organization emerge from an implicit negotiation of conventions, with mutual influence between the students and the tool.     

浅析中国古代牌坊的主要社会职能

文章从中国古代社会思想、社会控制和社会组织的角度出发,探究牌坊作为中国古代道德伦理和宗法礼教的精神工具、民俗民风的物质载体和空间界定符号,在中国古代的主要社会职能。     

Social Network Model of Construction

Engineering and construction projects are dependent on two fundamental elements: (1) the ability to plan and manage the technical components of the project such as the tasks and resources; and (2) the ability of the project participants to effectively develop into a high performance team. Historically, the industry has focused extensively on optimizing the project management processes associated with the former element. In this focus, organizations have emphasized the ability to develop the optimum plan, allocate resources efficiently, and utilize control functions to ensure that the project stays on schedule and within budget. Although this has been effective, this engineering focus has reached the point of diminishing results. Specifically, the engineering approach to project management has neglected to recognize the importance of the participants to the success of the overall project. Rather, the engineering approach has favored the development of an optimum plan as the path to effective project management. In this paper, the engineering-based approach to project success is reconfigured to reemphasize the need to develop high performing teams by recognizing the importance of the project network. This recognition is formalized in the social network model of construction that integrates classic project management concepts with social science variables to enhance the focus on knowledge sharing as the foundation for achieving high performance teams and project results.     

Adherence to RIASEC structure as a key career decision construct.

The present study examined the relation between individual cognitive structure and several key career decision variables. Specifically, in a sample of college students enrolled in a career development class, the usage of the RIASEC (Realistic, Investigative, Artistic, Social, Enterprising, and Conventional) circumplex (adherence) was examined as it varied across individuals and with career certainty, career decision-making self-efficacy, and interest-occupation congruence. Individual adherence to the RIASEC circumplex as a cognitive structure was related to better career decision outcomes. Changes in adherence as a function of taking a career class were found to be associated with changes in career certainty, career decision-making self-efficacy, and interest-occupation congruence. The results support the importance of thinking about careers in a manner similar to the RIASEC circumplex and the potential value of direct instruction of this model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cluster ranking with an application to mining mailbox networks

We initiate the study of a new clustering framework, called cluster ranking. Rather than simply partitioning a network into clusters, a cluster ranking algorithm also orders the clusters by their strength. To this end, we introduce a novel strength measure for clusters—the integrated cohesion—which is applicable to arbitrary weighted networks. We then present a new cluster ranking algorithm, called C-Rank. We provide extensive theoretical and empirical analysis of C-Rank and show that it is likely to have high precision and recall. A main component of C-Rank is a heuristic algorithm for finding sparse vertex separators. At the core of this algorithm is a new connection between vertex betweenness and multicommodity flow. Our experiments focus on mining mailbox networks. A mailbox network is an egocentric social network, consisting of contacts with whom an individual exchanges email. Edges between contacts represent the frequency of their co–occurrence on message headers. C-Rank is well suited to mine such networks, since they are abundant with overlapping communities of highly variable strengths. We demonstrate the effectiveness of C-Rank on the Enron data set, consisting of 130 mailbox networks.     

Why people benefit from e-learning differently: The effects of psychological processes on e-learning outcomes

Using social cognitive theory, we opened up the black box of psychological processes in which e-learners engage. We believed that prior experience with ICT and virtual competence were two influential factors that affected e-learning and had a positive influence on its outcomes. We tested our hypotheses on a sample of 383 Chinese students participating in online courses. Our findings confirmed the effect of virtual competence and revealed a nuanced mechanism by which experiences with ICT affected e-learning outcomes. We discussed the implications of this in e-learning practice.     

An assessment of advanced mobile services acceptance: Contributions from TAM and diffusion theory models

Today, in addition to traditional mobile services, there are new ones already being used, thanks to the advances in 3G-related technologies. Our work contributed to the emerging body of research by integrating TAM and Diffusion Theory. Based on a sample of 542 Dutch consumers, we found that traditional antecedents of behavioral intention, ease of use and perceived usefulness, can be linked to diffusion-related variables, such as social influence and perceived benefits (flexibility and status).     

The effect of cyber-friends on loneliness and social anxiety: Differences between high and low self-evaluated physical attractiveness groups

This study examined the causal relationships between the number of cyber-friends participants had and their social anxiety or loneliness. We predicted that participants who gave low self-evaluations of physical attractiveness would be able to lower their social anxiety or reduce their loneliness through Internet-based interpersonal relationships. Also, such effects would be more prominent if the cyber-friends were of the opposite sex. A two-wave panel study was conducted with 178 Japanese undergraduate students (63 men and 115 women; mean age was 20.29). Results showed that for those who gave a low evaluation of their physical attractiveness, having a large number of cyber-friends lowered their social anxiety and reduced the loneliness felt in friendships. These effects differed by gender of the cyber-friends. In particular, for those who gave a low evaluation of their physical attractiveness, having a large number of cyber-friends of the same sex had a positive effect on social anxiety. In contrast, cyber-friends of the opposite sex had no effect on social anxiety, but had a complex effect upon loneliness. Namely, while a large number of cyber-friends of the opposite sex reduced the loneliness felt in friendships, it also heightened the loneliness felt in family relationships. Implications of these results for further research and practice are provided.     

Identity construction on Facebook: Digital empowerment in anchored relationships

Early research on online self-presentation mostly focused on identity constructions in anonymous online environments. Such studies found that individuals tended to engage in role-play games and anti-normative behaviors in the online world. More recent studies have examined identity performance in less anonymous online settings such as Internet dating sites and reported different findings. The present study investigates identity construction on Facebook, a newly emerged nonymous online environment. Based on content analysis of 63 Facebook accounts, we find that the identities produced in this nonymous environment differ from those constructed in the anonymous online environments previously reported. Facebook users predominantly claim their identities implicitly rather than explicitly; they “show rather than tell” and stress group and consumer identities over personally narrated ones. The characteristics of such identities are described and the implications of this finding are discussed.     

《机械原理与机械零件》教学中如何培养学生的思维能力

本文从三个方面论述在《机械原理与机械零件》课程中如何培养学生的思维能力。这三个方面就是：培养学生思考的兴趣；帮助学生增强记忆；培养学生理性思维能力。