4 research outputs found
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Interactive Supercomputing’s Star-P Platform
The thesis of this extended abstract is simple. High productivity comes from high level infrastructures. To measure this, we introduce a methodology that goes beyond the tradition of timing software in serial and tuned parallel modes. We perform a classroom productivity study involving 29 students who have written a homework exercise in a low level language (MPI message passing) and a high level language (Star-P with MATLAB client). Our conclusions indicate what perhaps should be of little surprise: (1) the high level language is always far easier on the students than the low level language. (2) The early versions of the high level language perform inadequately compared to the tuned low level language, but later versions substantially catch up. Asymptotically, the analogy must hold that message passing is to high level language parallel programming as assembler is to high level environments such as MATLAB, Mathematica, Maple, or even Python. We follow the Kepner method that correctly realizes that traditional speedup numbers without some discussion of the human cost of reaching these numbers can fail to reflect the true human productivity cost of high performance computing. Traditional data compares low level message passing with serial computation. With the benefit of a high level language system in place, in our case Star-P running with MATLAB client, and with the benefit of a large data pool: 29 students, each running the same code ten times on three evolutions of the same platform, we can methodically demonstrate the productivity gains. To date we are not aware of any high level system as extensive and interoperable as Star-P, nor are we aware of an experiment of this kind performed with this volume of data
Lilliput
Catalog for the exhibition Lilliput held at the Seton Hall University Walsh Gallery, June 8 - July 24, 2009. Curated by Jeanne Brasile and Asha Ganpat. Includes an essay by Jeanne Brasile and Asha Ganpat. Includes color illustrations
Come together: two studies concerning the impact of group relations on personal space
This paper describes two experiments investigating the impact of group relations on personal space. In Study 1, participants (N=39) in minimal groups were told that they would be interacting with another person. In line with expectations, personal space (as measured by the distance between chairs) was significantly less in the intragroup context than in the intergroup and interpersonal contexts. This finding was replicated in Study 2 (N=80) using an improved experimental design. These results are discussed in terms of developing a self-categorization account of personal space and crowding
Acute management of hemodynamically unstable pelvic trauma patients: Time for a change? Multicenter review of recent practice
© Société Internationale de Chirurgie 2008Background: Hemorrhage-related mortality (HRM) associated with pelvic fractures continues to challenge trauma care. This study describes the management and outcome of hemodynamically unstable patients with a pelvic fracture, with emphasis on primary intervention for hemorrhage control and HRM. Methods: Blunt trauma patients [Injury Severity Score (ISS) ≥16] with a major pelvic fracture (Abbreviated Injury Score, pelvis ≥3) and hemodynamic instability [admission systolic blood pressure (SBP) ≤90 mmHg or receiving ≥6 units of packed red blood cells (PRBCs)/24 hours) were included into a 48-month (ending in December 2003) multicenter retrospective study of 11 major trauma centers. Data are presented as the mean ± SD. Results: A total of 217 patients (mean age 41 ± 19 years, 71% male, ISS 42 ± 16) were studied. The admission SBP was 96 ± 37 mmHg and the Glascow Coma Scale (GCS) 11 ± 5. Patients received 4 ± 2 liters of fluids including 4 ± 4 units of PRBCs in the emergency room (ER). In total, 69 (32%) patients died, among whom the HRM was 19%; 29% of the deaths were due to pelvic bleeding. Altogether, 120 of the 217 (55%) patients underwent focused abdominal sonography for trauma (FAST) or diagnostic peritoneal aspiration (DPA) and diagnostic peritoneal lavage (DPL); 60 of the 217 (28%) patients were found to have pelvic binding in the ER. In all, 53 of 109 (49%) patients had no bleeding noted at laparotomy, 26 of 106 (25%) had no abdominal findings, and 15 of 53 (28%) had had no prior abdominal investigation (FAST/DPL/computed tomography). Angiography was positive in 48 of 58 (83%) patients. The HRM was highest in patients with laparotomy as the primary intervention (29%) followed by the angiography group (18%), the combined laparotomy/pelvic fixation group (16%), and the pelvic fixation-only group (10%). Conclusion: HRM associated with major pelvic trauma is unacceptably high especially in the laparotomy group. Hence, nontherapeutic laparotomy must be avoided, concentrating instead on arresting pelvic hemorrhage. Standards of care must be implemented and abided by.Diederik Verbeek, Michael Sugrue, Zsolt Balogh, Danny Cass, Ian Civil, Ian Harris, Thomas Kossmann, Steve Leibman, Valerie Malka, Anthony Pohl, Sudhakar Rao, Martin Richardson, Michael Schuetz, Caesar Ursic and Vanessa Will