129,948 research outputs found
Vectorization with Haswell and CilkPlus
No full textProject Specification:
This project concerns the parallel computing and vectorization field for Physics Computing at CERN. The document summarises the results and experience from vectorization activities and an initial evaluation of the CilkPlus technology with two different benchmarks from CERN.
Abstract:
With the release of the Intel Sandy Bridge processor, vectorization ceased to be a “nice to have” feature and became a necessity. This work is focused on optimization, running comparative measurements of available vectorization technologies currently under investigation by the CERN Concurrency Forum. In particular, the project involves an assessment of the limits of autovectorization in two compilers, an evaluation of CilkPlus as implemented in ICC/GCC and an evaluation of AVX/AVX2 benefits with respect to legacy SSE workloads
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Hamilton's rule and its discontents
No full textIn an incendiary 2010 Nature article, M. A. Nowak, C. E. Tarnita and E. O. Wilson present a savage critique of the best known and most widely used framework for the study of social evolution, W. D. Hamilton’s theory of kin selection. Over a hundred biologists have since rallied to the theory’s defence, but Nowak et al. maintain that their arguments ‘stand unrefuted’. Here I consider the most contentious claim Nowak et al. defend: that Hamilton’s rule, the core explanatory principle of kin selection theory, ‘almost never holds’. I first distinguish two versions of Hamilton’s rule in contemporary theory: a special version (HRS) that requires restrictive assumptions, and a general version (HRG) that does not. I then show that Nowak et al. are most charitably construed as arguing that HRS almost never holds, while HRG buys its generality at the expense of explanatory power. While their arguments against HRS are fairly uncontroversial, their arguments against HRG are more contentious, yet these have been largely overlooked in the ensuing furore. I consider the arguments for and against the explanatory value of HRG, with a view to assessing what exactly is at stake in the debate. I suggest that the debate hinges on issues concerning the causal interpretability of regression coefficients, and concerning the explanatory function Hamilton’s rule is intended to serve
Nonzero-sum Stochastic Games
No full textThis paper treats of stochastic games. We focus on nonzero-sum games and provide a detailed survey of selected recent results. In Section 1, we consider stochastic Markov games. A correlation of strategies of the players, involving ``public signals'', is described, and a correlated equilibrium theorem proved recently by Nowak and Raghavan for discounted stochastic games with general state space is presented. We also report an extension of this result to a class of undiscounted stochastic games, satisfying some uniform ergodicity condition. Stopping games are related to stochastic Markov games. In Section 2, we describe a version of Dynkin's game related to observation of a Markov process with random assignment mechanism of states to the players. Some recent contributions of the second author in this area are reported. The paper also contains a brief overview of the theory of nonzero-sum stochastic games and stopping games which is very far from being complete.average payoff stochastic games, correlated stationary equilibria, nonzero-sum games, stopping time, stopping games
Ceratothoa barracuda Martin, Bruce & Nowak 2015
No full textCeratothoa barracuda Martin, Bruce & Nowak, 2015 (Fig. 3 A–D) Ceratothoa sp. 1.— Trilles, 1979: 269, pl. 2, fig. 13. Ceratothoa barracuda Martin, Bruce & Nowak, 2015a: 261, figs. 5–8. Material examined. 1 ovig. ♀ (19 mm TL; 6 mm W) (UMT Crus 01160), 1 mature ♁ (7 mm TL; 3 mm W) (UMT Crus 01161), St 109, EEZ, 04º 44’ 85” N; 104º 39’ 4518” E, 15 July 2016, from buccal cavity of Sphyraena forsteri, coll. SEAFDEC. Host. Only known from the family Sphyraenidae: bigeye barracuda Sphyraena forsteri (Cuvier, 1829) (Martin et al. 2015a, present study). Distribution. Malaysia, Terengganu; northern Australia (Martin et al. 2015a); West Papua (Trilles 1979). Based on the known host association and its distribution, Ceratothoa barracuda may have an Indo-Pacific distribution from East Africa and Southeast Asia to Japan and south of New Caledonia (Froese and Pauly 2022). Remarks. Ceratothoa barracuda is a new record for Malaysian waters and identified by elongate body; subtriangular cephalon; subacute anterolateral projections on pereonite 1; pleotelson with convex posterior margin; pereopods 5–7 bases with strong carinae and enlarged ischium (Martin et al. 2015a). Most similar to Ceratothoa carinata, but C. carinata with pleotelson posterior margin strongly concave; enlarged ischium and basis only present on pereopod 7; antennula articles distally to article 4 narrower than those of C. barracuda (Martin et al. 2015).Published as part of Martin, Melissa B., Tuah, Alia, Muhamad, Juariah H. & Bruce, Niel L., 2022, A review of the family Cymothoidae (Isopoda: Cymothooidea) infesting marine fishes from Malaysian waters, with new host and geographical records, pp. 1-36 in Zootaxa 5222 (1) on page 7, DOI: 10.11646/zootaxa.5222.1.1, http://zenodo.org/record/745638
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Text & Speech: Robot Communication Design
No full textHuman-robot interaction studies examine what happens when robots and peo-
ple communicate and how to best design the robot interface. A robot interface
includes everything people see, touch, or hear as they engage with a robot, includ-
ing the way they communicate. Social robots are increasing their communication
skills, enabling them to generate, comprehend, and respond to a wider selection
of messages or commands, and to do so more #uidly and in ways that are increas-
ingly similar to human-human interaction. Engineering and design decisions
determine both the robot’s function and appearance, as well as the way people
engage with the robot, which in#uences perceived capabilities and expectations
(Banks, 2020; Rosenthal-von der Pütten et al., 2018). !us, a major challenge in
the design and engineering of social robots is balancing (a) the need to be agile
in speech and behavior so they may adapt to individual humans and contexts,
against (b) human requirements for affordability, fit for human social spaces and
processes, and other context-driven functionality (Lin et al., 2017)
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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