130,667 research outputs found
Selbstschädigung
No full textMummendey HD. Selbstschädigung. In: Boothe B, Marx W, eds. Panne - Irrtum - Missgeschick. Bern: Huber; 2003: 145-160
Evaluating One-Sided Communication for Graph Analytics with MPI-RMA and OpenSHMEM
No full textThe message passing interface (MPI) remains the primary parallel-pro\-gram\-ming library for developing and running code on massively parallel distributed systems. While traditionally used for two-sided and collective communication, the latest MPI standards support remote memory access (RMA) between processes to enable one-sided communication. This paradigm is associated with fine-grained communication and irregular memory accesses, commonly found in graph analytics. This research develops and evaluates distributed implementations of betweenness centrality, a staple graph analysis algorithm, using traditional MPI, MPI-RMA, and OpenSHMEM. The performance of all three versions is found to be nearly identical due to the algorithm's trivially parallel nature, making it a poor fit for evaluating the impact of each communication library on distributed computing performance. The study then focuses on Graph500, a popular benchmark built upon breadth-first search (BFS) on an undirected graph, known for its sparse data accesses and fine-grained communication. The scalability of multiple BFS implementations using MPI-RMA is analyzed and compared against existing OpenSHMEM-based implementations optimized to maximize the benefits of one-sided communication. Additionally, we evaluate these implementations against the state-of-the-art MPI reference code using different numbers of processing elements and various problem sizes. Our experimental evaluation shows consistently improved performance with MPI-RMA over the best OpenSHMEM implementation on Graph500's BFS kernel with scales up to 32 nodes on the Pittsburgh Supercomputing Center Bridges-2 Regular Memory partition and University of Pittsburgh Center for Research Computing (Pitt CRC) MPI Cluster. However, we were unable to outperform the MPI reference implementation in most scenarios with one-sided communication. While we demonstrate MPI-RMA to achieve ∼1.8× better performance over the MPI reference implementation on 32 nodes when only using 4 cores per node, the reference version was more performant in the majority of configurations tested. While one-sided communication has shown promising performance on some large-scale computing tasks, the difficulty of designing and developing applications to efficiently leverage one-sided communication remains a challenge. Additionally, we show that system architecture and library choices can significantly impact the expected performance of one-sided communication
Letter from H. C. Kilpatrick, Mills and Kilpatrick, Washington, D. C., to Gardner L. Boothe, Charlottesville, Virginia, January 13, 1945
No full textThis item is from the Woodward Family Papers, an extensive collection, including business and personal correspondence, financial records, photographs, and other materials of this Birmingham, Alabama family which operated the Woodward Iron Company
Letter from H. C. Kilpatrick, Mills and Kilpatrick, Washington, D. C., to Gardner L. Boothe, Charlottesville, Virginia, January 9, 1945
No full textThis item is from the Woodward Family Papers, an extensive collection, including business and personal correspondence, financial records, photographs, and other materials of this Birmingham, Alabama family which operated the Woodward Iron Company
Letter from H. C. Kilpatrick, Mills and Kilpatrick, Washington, D. C., to Gardner L. Boothe, Alexandria, Virginia, October 31, 1945
No full textThis item is from the Woodward Family Papers, an extensive collection, including business and personal correspondence, financial records, photographs, and other materials of this Birmingham, Alabama family which operated the Woodward Iron Company
Selbstschädigung
No full textMummendey HD. Selbstschädigung. In: Boothe B, Wolfgang Marx, Theo Wehner, eds. Panne - Irrtum - Missgeschick. Die Psychopathologie des Alltagslebnes in interdisziplinärer Perspektive. Lengerich: Pabst Science Publishers; 2016: 145-160
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
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
Discias vernbergi Boothe & Heard 1987
No full textDiscias vernbergi Boothe & Heard, 1987 Discias vernbergi Boothe & Heard, 1987: 506, figs. 1–3 [type locality: 65 nautical miles W of Egmont Key, Florida, 27°37’N 83°58’W, 55m]; Nizinski 2003: 102; Pachelle & De Grave 2015: 1473. Material examined. RMNH. CRUS.D.57263: 2 females (pocl. 3.15mm and 2.05mm) and 1 male (pocl. 2.9mm), Bonaire, 12°04'47"N, 068°17'37"W, depth 217m, 1.vi.2013, dive with Curasub submersible BON4 /BDR059, in sponge Neopetrosia dutchi Van Soest, Meesters & Becking, 2014, collected by L.E. Becking and H.W.G. Meesters. RMNH.CRUS.D.57264: 1 ovigerous female (pocl. 5.1mm), 7 females (pocl. 2.2 to 3.6mm), 8 males (pocl. 1.8 to 3.5mm), Bonaire, 12°04'47"N, 068°17'37"W, depth 246m, 31.v.2013, dive with Curasub submersible BON4 / BDR050, in sponge, collected by L.E. Becking and H.W.G. Meesters. RMNH.CRUS.D.57265: 1 male (pocl. 3.25mm), Bonaire, 12°08'13"N, 068°17'09"W, depth 159m, 31.v.2013, dive with Curasub submersible BON3, from hexactinellid sponge, collected by L.E. Becking and H.W.G. Meesters. Distribution. Discias vernbergi is described from the east coast (Georgia) and Gulf Coast (Florida) of the southeastern United States living at depths of 54 to 74 meters (Boothe & Heard 1987). The present specimens were found at depths up to 246 meters in the Caribbean, significantly increasing the depth at which this species can be found. Host. A host for the type specimens was not recorded. One of the specimens in the present collection was found in association with a hexactinellid sponge, the other in the neopetrosid species Neopetrosia dutchi Van Soest, Meesters & Becking, 2014. Most species of Discias have been recorded from sponge hosts (Bruce 1970, 1976; Kensley 1983; Pachelle & De Grave 2015). D. atlanticus has also been observed in the tubes of the parchment tubeworm Chaetopterus variopedatus (Renier, 1804) (Criales & Lemaitre 1997). Remarks. Discias vernbergi can be easily distinguished from the other species in the genus by the following characters: 1) the lanceolate shape of the rostrum with about 30 teeth laterally, 2) the absence of a posterior middorsal process on pleonal segment 2, 3) the presence of six pairs of cuspidate setae on the telson, 4) the presence of 4 to 9 fixed lateral teeth on the exopod of the uropod. The largest specimen from the current collection is larger than the previously recorded pocl. range of 2.1 to 4.1mm: one ovigerous female is present with a pocl. of 5.1mm. The other specimens range between 2.2 to 3.6mm pocl. for non-ovigerous females, and 1.8 to 3.05mm pocl. for males. The large ovigerous female has a higher number of lateral teeth on the exopod of the uropod: 8–9 instead of the 4–6 lateral spines in smaller specimens.Published as part of Olthof, Gabriël, Becking, Leontine E. & Fransen, Charles H. J. M., 2018, On a collection of deep-water shrimp (Crustacea, Decapoda) from the Dutch Caribbean, with the description of a new species of Pseudocoutierea, pp. 533-548 in Zootaxa 4415 (3) on page 535, DOI: 10.11646/zootaxa.4415.3.7, http://zenodo.org/record/124220
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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