Problematic Instant Messaging Use

This study is an empirical investigation of problematic instant messaging (IM) use among university students in Singapore. It adapts Caplan's (2005) theoretical framework of problematic Internet use (PIU) to the context of problematic IM use by linking pre-existing human dispositions to cognitive-behavioral symptoms and negative outcomes of improper IM use. Four new factors—oral communication apprehension, polychronicity, perceived inconvenience of using offline communication means, and trait procrastination—were tested as predictors of problematic IM use. The results provided strong support for Caplan's theoretical framework of PIU and indicated that oral communication apprehension and perceived inconvenience of using offline means were significant predictors of problematic IM use, whereas polychronicity and trait procrastination were not. The implications of these findings are discussed.     

Post-traumatic hormonal disturbances: prolactin as a link between head injury and enhanced osteogenesis

The local recurrence rate after rectal cancer surgery is discussed as related to conventional and total mesorectal excision (TME) techniques. Studies now show that the wide variation in results between centers and among surgeons depends, at least in part, on differences in surgical technique. We conclude that local tumor recurrence rate is lower after TME than after conventional surgery and emphasize the importance of a standardized macroscopic evaluation of the resected specimen. Population-based registration to evaluate the quality of surgery is recommended. It is also suggested that randomized studies on adjuvant treatment for rectal cancer should include a "surgery only" arm when a local tumor recurrence rate of 10% or less is being studied. Until such investigations are performed, we conclude that the role for adjuvant treatment is questionable and that TME surgery is preferred as the treatment option for Stage T1-T3 rectal cancers.     

Culture,technologies and democracy: A cross-national analysis of political development

Communication technologies have been hailed as having a potential to promote democracy and freedom, and this paper aims to examine these claims in a comparative, international context. Our analysis focuses on the mediating role of horizontal communication networks (i.e., telephone, mobile telephone and the Internet) in the relationship between culture and political development. Using cultural value indicators of the World Values Survey and the measures of communication technology development, this study tests the mediating path from culture to communication technologies and to political development. The results suggest that cultural values have a role in shaping the structural characteristics of horizontal networks such as accessibility and decentralization, and that these features of horizontal networks are positively related to institutional and effective democracy as well as to economic competitiveness of nations.     

Tardos Fingerprinting is Better Than We Thought

Tardos has proposed a randomized fingerprinting code that is provably secure against collusion attacks. We revisit his scheme and show that it has significantly better performance than suggested in the original paper. First, we introduce variables in place of Tardos' hard-coded constants and we allow for an independent choice of the desired false positive (FP) and false negative (FN) error rates. Following through Tardos' proofs with these modifications, we show that the code length can be reduced by more than a factor of two in typical content distribution applications where high FN rates can be tolerated. Second, we study the statistical properties of the code. Under some reasonable assumptions, the accusation sums can be regarded as Gaussian-distributed stochastic variables. In this approximation, the desired error rates are achieved by a code length twice shorter than in the first approach. Overall, typical FP and FN error rates may be achieved with a code length approximately five times shorter than in the original construction.     

Influence of discharge energy on machining characteristics in EDM

The machining characteristics of electrical discharge machining (EDM) directly depend on the discharge energy which is transformed into thermal energy in the discharge zone. The generated heat leads to high temperature, resulting in local melting and evaporation of workpiece material. However, the high temperature also impacts various physical and chemical properties of the tool and workpiece. This is why extensive knowledge of development and transformation of electrical energy into heat is of key importance in EDM. Based on the previous investigations, analytical dependence was established between the discharge energy parameters and the heat source characteristics in this paper. In addition, the thermal properties of the discharged energy were experimentally investigated and their influence on material removal rate, gap distance, surface roughness and recast layer was established. The experiments were conducted using copper electrode while varying discharge current and pulse duration. Analysis and experimental research conducted in this paper allow efficient selection of relevant parameters of discharge energy for the selection of most favorable EDM machining conditions.     

The implications of big data for developing and transitional economies: Extending the Triple Helix?

This study examines the implications of the predicted big data revolution in social sciences for the research using the Triple Helix (TH) model of innovation and knowledge creation in the context of developing and transitional economies. While big data research promises to transform the nature of social inquiry and improve the world economy by increasing the productivity and competitiveness of companies and enhancing the functioning of the public sector, it may also potentially lead to a growing divide in research capabilities between developed and developing economies. More specifically, given the uneven access to digital data and scarcity of computational resources and talent, developing countries are at disadvantage when it comes to employing data-driven, computational methods for studying the TH relations between universities, industries and governments. Scientometric analysis of the TH literature conducted in this study reveals a growing disparity between developed and developing countries in their use of innovative computational research methods. As a potential remedy, the extension of the TH model is proposed to include non-market actors as subjects of study as well as potential providers of computational resources, education and training.     

Facebook bullying: An extension of battles in school

This study examines the phenomenon of cyberbullying on Facebook and how it is related to school bullying among secondary school students in Singapore, aged 13–17. We also focus on generic use of Facebook and risky Facebook behaviors as the predictors of cyberbullying and victimization on Facebook. 1676 secondary students, from two secondary schools, participated in a pen and paper survey. The findings show that the intensity of Facebook use and engagement in risky Facebook behaviors were related to Facebook victimization and Facebook bullying, respectively. Moderately strong positive relationships between school bullying and Facebook bullying, as well as between school victimization and Facebook victimization, were also uncovered.     

Stepping out of the Magic Circle: Regulation of Play/Life Boundary in MMO‐Mediated Romantic Relationship

Massively multiplayer online role‐playing games (MMOs) are spaces of socialization and relationship formation and maintenance. This qualitative study seeks to understand how MMO players delineate the boundary between play and life when it comes to their game‐originated romance. A typology of players was devised to understand players' constructions of boundaries, and players' strategies against perceived stigma when moving their relationship offline were discussed. The findings call for a shift towards a more player‐centric and pluralist conceptualization of the magic circle of play.