Almost optimal solutions for bin coloring problems

In this paper we study two interesting bin coloring problems: Minimum Bin Coloring Problem (MinBC) and Online Maximum Bin Coloring Problem (OMaxBC), motivated from several applications in networking. For the MinBC problem, we present two near linear time approximation algorithms to achieve almost optimal solutions, i.e., no more than OPT+2 and OPT+1 respectively, where OPT is the optimal solution. For the OMaxBC problem, we first introduce a deterministic 2-competitive greedy algorithm, and then give lower bounds for any deterministic and randomized (against adaptive offline adversary) online algorithms. The lower bounds show that our deterministic algorithm achieves the best possible competitive ratio. The research of this paper was partially supported by an NSF CAREER award CCF-0546509.     

Motivations for self-assembling into project teams

This study investigates the self-assembly mechanisms of ad hoc project teams using a bipartite network perspective. Individuals and projects are modeled as two types of nodes and team membership as relations between them. This approach enables us to investigate factors that impact voluntary team assembly at the individual, dyadic, and team levels simultaneously. Using Exponential Random Graph Models (ERGM/p*), we study players’ combat teams in a Massively Multiplayer Online Role-Playing Game (MMORPG) as a case of self-assembled project teams. Empirical results show that individuals are motivated to join ad hoc teams to complete difficult projects but not projects with long durations. We also found that individuals tend to collaborate with specific teammates who have complementary skills, those who have similar age or skill level, and those who are affiliated with the same organizational entity.     

School Social Work Information Systems (SSWIS): A Relational Database for School Social Workers

SUMMARY

After a review of their information management system, the Winston-Salem/Forsyth County School Social Work Office began a process to improve data collection and information management. The result was the creation of the School Social Work Information System, a relational database designed and developed by the school social workers themselves. This article reviews the process of evaluating existing systems, developing and implementing the new system, evaluation and continued development of the new system, and implications for further social work practice. This article is intended to provide the school social worker with the necessary information to develop similar systems.     

Using an Online Support Site to Extend the Learning to a Graduate Field Practicum in the United States

An online support site was constructed for graduate social work students at San Diego State University in California during their first‐year field practicum. A study was conducted to explore and describe the attitudes of these students toward the usefulness of the site's online features. Students participated in the site through the Blackboard Software Platform by adding discussion threads to asynchronous forums on an online discussion board, receiving information through online announcements, accessing field‐related materials through the site, and engaging in an online network. The most useful forum was related to the learning plan that students were required to complete in planning and organizing their field practicum experience. Students reported that the most useful feature of the site was the ability to access timely information through the online announcements from the Field Education Program.     

Teaching Clinical Social Work Skills Entirely Online: A Case Example

While numerous disciplines have eagerly embraced innovative educational technology, many social work educators have not been among early adopters. Social work's focus on the human connection and hands‐on practice skills can seem antithetical to technology‐mediated education. Nevertheless, social work programs are implementing distance learning and Internet‐mediated courses, and some schools are offering entire social work courses online. Leading the way in this regard is the Florida State University College of Social Work, which has developed and implemented the first CSWE‐accredited, entirely online Master of Social Work program. The purpose of this paper is to describe the development, design, and implementation of one skills‐based clinical course in this program, with the goal of sharing information in a way that will further the discussion of the risks and benefits of online education as well as provide guidance for educators who may be interested in developing a skills‐based online course in the future.     

Blended Learning in Rural Social Work Education: Reflections from a New Australian Bachelor of Social Work Course

This paper explores the developmental stages and phases of a new blended learning social work course at a rural Australian university. The background to the development of the discipline will be presented, with an exploration of the challenges and outcomes of designing an interactive online environment for a single cohort of on-campus and distance students. Themes explored cover engaging students, motivation, acculturation and facilitation. The paper concludes with the presentation of data from wave one of a longitudinal survey to ensure student expectations are being met, while at the same time providing an accredited programme of study.     

A Study of Online Auction Sellers’ Intention to Switch Platform: The Case of Yahoo!Kimo Versus Ruten_eBay*

The study of consumers’ switching from one service provider to another has a long tradition in economics, information systems, and marketing. The emergence of electronic commerce presents new challenges in understanding consumers’ switching intentions in the context of e‐commerce in general and online auctions in particular. With the abundance of literature on online auctions, there is a surprising lack of research on auction sellers’ intentions to switch from one online auction platform to another. Using the competition between Yahoo!Kimo and Ruten_eBay, two leading auction platforms in Taiwan, as the backdrop, we developed a research model and collected empirical data based on this real case to study what factors influence auction sellers to switch to a competing service provider. We find that the higher the procedural switching costs, financial switching costs, relational switching costs, site design quality, or interaction quality, the lower the intention of an auction seller to switch to a competing auction service provider. A higher perceived transaction fee, however, leads to a higher switching intention.     

Will they stay or will they go? How network properties of WebICs predict dropout rates of valuable Wikipedians

This paper contributes to our understanding of an increasingly prevalent work system, web-based internet communities (WebICs). We are particularly interested in how WebICs are governed given the fact how different they are compared to more classical forms of organization. We study the governance of a WebIC by studying the structure and dynamics of their edit network. Given the fact that the edit network is a relational structure, social network analysis is key to understanding these work systems. We demonstrate that characteristics of the edit network contribute to predicting the dropout hazard of valuable WebIC members. Since WebICs exist only thanks to the activity of their contributors, predicting drop-outs becomes crucial. The results show that reputation and controversy have different effects for different types of Wikipedians; i.e., an actor’s reputation decreases the dropout hazard of active Wikipedians, while participation on controversial pages decreases the dropout hazard of highly active Wikipedians.     

How climate change organizations utilize websites for public relations

This study is designed to examine climate change organizations (CCO)’s online public relations. It analyzes CCOs’ communicative efforts to build and maintain relationships with key stakeholders including media, donors, volunteers, and communities by using their websites and social networks. To accomplish this, a content analysis of 60 CCO websites was conducted. The result indicates that CCOs utilize websites primarily for media relations and fund raising purposes. The function of building and maintaining relationships with communities, current donors/volunteers was not actively utilized on CCOs’ websites. The interactivity of communication with stakeholders was somewhat limited in CCO's online communication activities.     

Are social networking sites a source of online harassment for teens? Evidence from survey data

Media reports on incidences of abuse on the internet, particularly among teenagers, are growing at an alarming rate causing much concern among parents of teenagers and prompting legislations aimed at regulating internet use among teenagers. Social networking sites (SNS) have been criticized for serving as a breeding ground for cyber-bullying and harassment by strangers. However, there is a lack of serious research studies that explicitly identify factors that make teenagers prone to internet abuse, and study whether it is SNS that is causing this recent rise in online abuse or is it something else. This study attempts to identify the key factors associated with cyber-bullying and online harassment of teenagers in the United States using the 2006 round of Pew Internet™ American Life Survey that is uniquely suited for this study. Results fail to corroborate the claim that having social networking site memberships is a strong predictor of online abuse of teenagers. Instead this study finds that demographic and behavioral characteristics of teenagers are stronger predictors of online abuse.