155,901 research outputs found
RTSim: A cycle-accurate simulator for racetrack memories
Racetrack memories (RTMs) have drawn considerable attention from computer architects of late. Owing to the ultra-high capacity and comparable access latency to SRAM, RTMs are promising candidates to revolutionize the memory subsystem. In order to evaluate their performance and suitability at various levels in the memory hierarchy, it is crucial to have RTM-specific simulation tools that accurately model their behavior and enable exhaustive design space exploration. To this end, we propose RTSim, an open source cycle-accurate memory simulator that enables performance evaluation of the domain-wall-based racetrack memories. The skyrmions-based RTMs can also be modeled with RTSim because they are architecturally similar to domain-wall-based RTMs. RTSim is developed in collaboration with physicists and computer scientists. It accurately models RTM-specific shift operations, access ports management and the sequence of memory commands beside handling the routine read/write operations. RTSim is built on top of NVMain2.0, offering larger design space for exploration
A quantitative perspective on ethics in large team science
The gradual crowding out of singleton and small team science by large team
endeavors is challenging key features of research culture. It is therefore
important for the future of scientific practice to reflect upon the individual
scientist's ethical responsibilities within teams. To facilitate this
reflection we show labor force trends in the US revealing a skewed growth in
academic ranks and increased levels of competition for promotion within the
system; we analyze teaming trends across disciplines and national borders
demonstrating why it is becoming difficult to distribute credit and to avoid
conflicts of interest; and we use more than a century of Nobel prize data to
show how science is outgrowing its old institutions of singleton awards. Of
particular concern within the large team environment is the weakening of the
mentor-mentee relation, which undermines the cultivation of virtue ethics
across scientific generations. These trends and emerging organizational
complexities call for a universal set of behavioral norms that transcend team
heterogeneity and hierarchy. To this end, our expository analysis provides a
survey of ethical issues in team settings to inform science ethics education
and science policy.Comment: 13 pages, 5 figures, 1 table. Keywords: team ethics; team management;
team evaluation; science of scienc
Predicting Scientific Success Based on Coauthorship Networks
We address the question to what extent the success of scientific articles is
due to social influence. Analyzing a data set of over 100000 publications from
the field of Computer Science, we study how centrality in the coauthorship
network differs between authors who have highly cited papers and those who do
not. We further show that a machine learning classifier, based only on
coauthorship network centrality measures at time of publication, is able to
predict with high precision whether an article will be highly cited five years
after publication. By this we provide quantitative insight into the social
dimension of scientific publishing - challenging the perception of citations as
an objective, socially unbiased measure of scientific success.Comment: 21 pages, 2 figures, incl. Supplementary Materia
Detecting rich-club ordering in complex networks
Uncovering the hidden regularities and organizational principles of networks
arising in physical systems ranging from the molecular level to the scale of
large communication infrastructures is the key issue for the understanding of
their fabric and dynamical properties [1-5]. The ``rich-club'' phenomenon
refers to the tendency of nodes with high centrality, the dominant elements of
the system, to form tightly interconnected communities and it is one of the
crucial properties accounting for the formation of dominant communities in both
computer and social sciences [4-8]. Here we provide the analytical expression
and the correct null models which allow for a quantitative discussion of the
rich-club phenomenon. The presented analysis enables the measurement of the
rich-club ordering and its relation with the function and dynamics of networks
in examples drawn from the biological, social and technological domains.Comment: 1 table, 3 figure
What went wrong with: "The Interaction of Neutrons With 7Be: "Lack of Standard Nuclear Physics Solution to the "Primordial 7Li Problem"", by M. Gai [arXiv:1812.09914v1]?
We comment here on results of the project aimed at measuring the 7Be(n,x)
reactions at SARAF, Israel, in 2016, posted by M. Gai in [arXiv:1812.09914v1]
without the knowledge of parts of the collaboration and against the explicit
veto of the collaborators and the administration of the Paul Scherrer Institut,
Switzerland. We address both the experimental shortcomings and the drawbacks in
project conduction. M. Gais preprint is labeled as "on behalf of the SARAF
Israel-US-Switzerland Collaboration", the author list is given as a reference
to another unpublished contribution (cited as [27]) to the NPA8 conference in
June 2017 in Catania). However, M. Gai did never have the right to report on
unpublished proprietary data of the entire collaboration, and he was not
authorized to act "on behalf of the collaboration". The contribution is
declared as "accepted for publication", but in fact was retracted during the
refereeing process. After several careful data evaluations, we have to state
that the results of these measurements are not trustworthy and neither the
given experimental data basis nor the corresponding data analysis can be
improved further. Therefore, we requested to retract the posting immediately
[arXiv:1904.03023]. We have to emphasize that, in our opinion, arXiv is not the
appropriate platform for handling frictions in a collaboration. These problems
should have been solved internally before publishing. Unfortunately, with his
single-handed posting against the explicit disagreement of parts of the
collaboration, M. Gai did not leave another possibility. With the present
article, we expressed all our concerns and objections and we consider herewith
the public discussion of this issue as closed.Comment: arXiv admin note: This version has been removed by arXiv
administrators due to copyright infringemen
Prediction of scientific collaborations through multiplex interaction networks
Link prediction algorithms can help to understand the structure and dynamics
of scientific collaborations and the evolution of Science. However, available
algorithms based on similarity between nodes of collaboration networks are
bounded by the limited amount of links present in these networks. In this work,
we reduce the latter intrinsic limitation by generalizing the Adamic-Adar
method to multiplex networks composed by an arbitrary number of layers, that
encode diverse forms of scientific interactions. We show that the new metric
outperforms other single-layered, similarity-based scores and that scientific
credit, represented by citations, and common interests, measured by the usage
of common keywords, can be predictive of new collaborations. Our work paves the
way for a deeper understanding of the dynamics driving scientific
collaborations, and provides a new algorithm for link prediction in multiplex
networks that can be applied to a plethora of systems
Collaboration in sensor network research: an in-depth longitudinal analysis of assortative mixing patterns
Many investigations of scientific collaboration are based on statistical
analyses of large networks constructed from bibliographic repositories. These
investigations often rely on a wealth of bibliographic data, but very little or
no other information about the individuals in the network, and thus, fail to
illustrate the broader social and academic landscape in which collaboration
takes place. In this article, we perform an in-depth longitudinal analysis of a
relatively small network of scientific collaboration (N = 291) constructed from
the bibliographic record of a research center involved in the development and
application of sensor network and wireless technologies. We perform a
preliminary analysis of selected structural properties of the network,
computing its range, configuration and topology. We then support our
preliminary statistical analysis with an in-depth temporal investigation of the
assortative mixing of selected node characteristics, unveiling the researchers'
propensity to collaborate preferentially with others with a similar academic
profile. Our qualitative analysis of mixing patterns offers clues as to the
nature of the scientific community being modeled in relation to its
organizational, disciplinary, institutional, and international arrangements of
collaboration.Comment: Scientometrics (In press
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