The degree to which people share knowledge has major impacts on the effectiveness of virtual community of practice (VCoP). As an extension to the previous study which investigated the effect of individual cooperative types (cooperator, reciprocator, or free rider) on knowledge sharing, we investigate how much increase in the degree of cooperation will enhance knowledge sharing when there are mo...

The prioritization of interaction test suites has received more attention in the field of combinatorial interaction testing, especially when testing resources are limited to allow the part of combinatorial test cases to be executed. Many strategies have been proposed to prioritize interaction test suites according to different evaluation measures. However, most of these strategies may face a ch...

2008 2007 School Carnegie Classification 1 1 Massachusetts Institute of Technology (Sloan) RUVH 2 2 Carnegie Mellon University (Tepper) (PA) RUVH 3 3 University of Texas–Austin (McCombs) RUVH 4 4 University of Minnesota–Twin Cities (Carlson) RUVH 5 5 University of Arizona (Eller) RUVH 6 6 University of Maryland–College Park (Smith) RUVH 10 7 University of Pennsylvania (Wharton) RUVH 7 8 Stanfor...

In this paper we highlight a specific mechanism through which social networks help in job search. We characterize the strength of a network by its likelihood of providing a job offer. Using a theoretical model we show that the wage differential in jobs found using networks versus those found using formal channels, decreases as the network becomes stronger. We verify this result for recent immig...

We study the antecedents to tie formation on an enterprise social media platform implemented to support cross-boundary connections. Research has produced mixed findings regarding the role of social media in cultivating bridging vs. closed networks. We examine the tie formation patterns of 1,386 enterprise social media users over a two-year period. We first find that users tend to form ties via ...

In examining genetic data in recent publications, Backeljau et al. showed cases in which two or more different trees (tie trees) were constructed from a single data set for the neighbor-joining (NJ) method and the unweighted pair group method with arithmetic mean (UPGMA). However, it is still unclear how often and under what conditions tie trees are generated. Therefore, I examined these proble...

We have recently cloned a novel human receptor tyrosine kinase, tie, from human leukemia cells showing megakaryoblastoid differentiation. We report here that the 4.4-kb tie messenger RNA (mRNA) is present in all human fetal and mouse embryonic tissues. By in situ hybridization, the tie mRNA was localized to the endothelia of blood vessels and endocardium of 9.5- to 18.5-day mouse embryos. Howev...

It is often suggested that there is a psychological advantage to be leading in a competition. It is, however, hard to identify such an effect econometrically. Using a Regression Discontinuity Design over a large dataset of tennis matches (N=634,095) the present paper exploits the randomised variation in first set results that occurs when the first set is decided by a close tie break (N=72,294)....

In this paper the near-field distributions of bow-tie apertures in visible range are characterized by the method of 3D finite-difference time-domain (FDTD). The numerical simulation results reveal theoretically the relation of field enhancement effect of bow-tie aperture and its several parameters including tip angle, aperture size and film thickness. For the bow-tie aperture with a certain tip...

In the past, most researchers focused on the efficacy of tie-strength in various applications for both online and offline social networks. However, how tie-strength can help in the analysis of online social networks was a commonly neglected issue. The massive size and recording properties of online social networks offer the possibility to measure tie-strength objectively. In this study, we exam...