391 research outputs found
Impact on Open Source Software Performance: A View from Social Structure
Open source software (OSS) has drawn increasing attention from both practitioners and researchers in recent years. However, few empirical studies have investigated the interaction process of OSS teams during OSS development. This research has two primary objectives. The first is to study the social structure of OSS teams. The second is to investigate the factors impacting the social structure of OSS teams as well as the effects of the social structure on OSS performance. Based on the social structure and social network theory, and group-related theories, this paper first presented a general research framework, then discussed research methodology, and finally describes a two-phase study plan. By exploring the relationships between group characteristics, social network, and OSS performance, the study contributes to the enhancement of knowledge on OSS development from the social structure perspective
Impacts of Social Network Structure on Knowledge Sharing in Open Source Software Development Teams
The study examines the relationship between social network structure and knowledge sharing in Open Source Software (OSS) development teams. One hundred and fifty projects were selected from SourceForge.net using stratified sampling. Social network structure was measured by two indices: degree of centralization and core/periphery fitness. Knowledge sharing was measured from two aspects: the quality of knowledge sharing that is indicated by the helpfulness of messages and the quantity of knowledge sharing that is indicated by the number of messages. The results show that social network structure significantly affects the quantity of knowledge sharing. However, social network structure does not influence the quality of knowledge sharing. In addition to the contribution to OSS literature, the results of this study also inform OSS practice
Factors Impacting E-Government Development
E-government is a way for governments to use new technologies such as the Internet to provide citizens with more convenient access to government information and services, to improve the quality of services, and to provide greater opportunities for citizens to participate in democratic institutions and processes. This research investigates factors impacting e-government development. Based on the growth theory and human capital theory from the economics literature, we hypothesize that information and computer technology, and human development are two factors impacting e-government development. The hypotheses were empirically tested using secondary data from the United Nations and the United Nations Development Programme. The results support the two hypotheses. Further analysis was also carried out to compare countries with low, medium, and high human development levels
A Research Stream on Sentiment Analysis
The authors study the effect of coupling a specialized lexicon to a general lexicon and its effect on the SA results
Magnetic Interaction between Surface Engineered Rare-earth Atomic Spins
We report the ab initio study of rare-earth adatoms (Gd) on an insulating
surface. This surface is of interest because of previous studies by scanning
tunneling microscopy showing spin excitations of transition metal adatoms. The
present work is the first study of rare-earth spin-coupled adatoms, as well as
the geometry effect of spin coupling, and the underlying mechanism of
ferromagnetic coupling. The exchange coupling between Gd atoms on the surface
is calculated to be antiferromagnetic in a linear geometry and ferromagnetic in
a diagonal geometry, by considering their collinear spins and using the PBE+U
exchange correlation. We also find the Gd dimers in these two geometries are
similar to the nearest-neighbor (NN) and the next-NN Gd atoms in GdN bulk. We
analyze how much direct exchange, superexchange, and RKKY interactions
contribute to the exchange coupling for both geometries by additional
first-principles calculations of related model systems
Quantum Hydrodynamics of Fractonic Superfluids with Lineon Condensate: from Navier-Stokes-like Equations to Landau-like Criterion
Fractonic superfluids are exotic states of matter with spontaneously broken
higher-rank symmetry. The latter is associated with conserved quantities
that include not only particle number (i.e. charge) but also higher moments,
such as dipoles, quadrupoles, and angular moments. Due to the presence of such
conserved quantities, the mobility of particles is restricted either completely
or partially. In this work, we systematically study hydrodynamical properties
of fractonic superfluids, especially focusing on the fractonic superfluids with
conserved angular moments. The constituent bosons are called "lineons" with
-components in -dimensional space. From Euler-Lagrange equation, we
derive the continuity equation and Navier-Stokes-like equations, in which the
angular moment conservation introduces extra terms. Furthermore, we discuss the
current configurations that are related to the defects. Like the conventional
superfluid, we study the critical values of velocity fields and density
currents, which gives rise to a Landau-like criterion. At the end of this work,
several future directions are discussed.Comment: Accepted by Chin. Phys. Lett. Series of work on fractonic superfluids
(arXiv:1911.02876, arXiv:2010.03261, arXiv:2104.03237, and arXiv:2201.08597
Parallel Implementation of Lossy Data Compression for Temporal Data Sets
Many scientific data sets contain temporal dimensions. These are the data
storing information at the same spatial location but different time stamps.
Some of the biggest temporal datasets are produced by parallel computing
applications such as simulations of climate change and fluid dynamics. Temporal
datasets can be very large and cost a huge amount of time to transfer among
storage locations. Using data compression techniques, files can be transferred
faster and save storage space. NUMARCK is a lossy data compression algorithm
for temporal data sets that can learn emerging distributions of element-wise
change ratios along the temporal dimension and encodes them into an index table
to be concisely represented. This paper presents a parallel implementation of
NUMARCK. Evaluated with six data sets obtained from climate and astrophysics
simulations, parallel NUMARCK achieved scalable speedups of up to 8788 when
running 12800 MPI processes on a parallel computer. We also compare the
compression ratios against two lossy data compression algorithms, ISABELA and
ZFP. The results show that NUMARCK achieved higher compression ratio than
ISABELA and ZFP.Comment: 10 pages, HiPC 201
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