Dr. H. Flegaric and Kurt Pordes to Dear Sir (13 October 1962)

https://egrove.olemiss.edu/mercorr_pro/2161/thumbnail.jp

Using Pilot Systems to Execute Many Task Workloads on Supercomputers

High performance computing systems have historically been designed to support applications comprised of mostly monolithic, single-job workloads. Pilot systems decouple workload specification, resource selection, and task execution via job placeholders and late-binding. Pilot systems help to satisfy the resource requirements of workloads comprised of multiple tasks. RADICAL-Pilot (RP) is a modular and extensible Python-based pilot system. In this paper we describe RP's design, architecture and implementation, and characterize its performance. RP is capable of spawning more than 100 tasks/second and supports the steady-state execution of up to 16K concurrent tasks. RP can be used stand-alone, as well as integrated with other application-level tools as a runtime system

Evaluation of the Occlusal Conditions in Patients with and without Dysfunction of the Masticatory Apparatus

The aim of the study was to ascertain whether there is any correlation between occlusal abnormalities with dysfunction of the masticatory apparatus. (DMA) 137 young people between 16-19 years of age were examined, including 57 with DMA and 80 without DMA. The diagnosis was established with the agreement of the International Headache Society (IHS) criteria and directories of the American Academy of Orofacial Pain. (AAOP). The occlusal conditions were evaluated with the help of the computer aided system T-Scan II (Tekscan, Inc, Boston, USA). According to this method occlusal point contacts (premature contacts) were evaluated at the beginning of the occlusion (centric relation-CR). At this time percentage distribution of the relative net force between teeth were determined. Teeth contacts with the maximum rel ative force along the dental arch were also recorded. In this way premature traumatic contacts were determined. There were also evaluated areas of support for the particular teeth or groups of the teeth in the maximum intercuspal position (MIP). The center of occlusal forces (COF) in MIP were then recorded. Finally percentage distribution of the values of the resultant occlusal force moments, acting on both sides of the dental arch, were evaluated. As normal differences in these values less than 9 % between bothsides of the dental arch were accepted. The other groups were defined on the basis of the differences in the values of both sides of the dental arch in the range: 10-19% as a satisfactory group, 20-29% as a moderate group, 30-39% as a high degree group and finally more than 40% as a very high degree group. The obtained results were submitted for statistical analysis. No correlations were found between occlusal abnormalities and DMA

The Effects of Dissolved Methane upon Liquid Argon Scintillation Light

In this paper we report on measurements of the effects of dissolved methane upon argon scintillation light. We monitor the light yield from an alpha source held 20 cm from a cryogenic photomultiplier tube (PMT) assembly as methane is injected into a high-purity liquid argon volume. We observe significant suppression of the scintillation light yield by dissolved methane at the 10 part per billion (ppb) level. By examining the late scintillation light time constant, we determine that this loss is caused by an absorption process and also see some evidence of methane-induced scintillation quenching at higher concentrations (50-100 ppb). Using a second PMT assembly we look for visible re-emission features from the dissolved methane which have been reported in gas-phase argon methane mixtures, and we find no evidence of visible re-emission from liquid-phase argon methane mixtures at concentrations between 10 ppb and 0.1%.Comment: 18 pages, 11 figures Updated to match published versio

The Fermilab program for the next decade a response to the Gilman HEPAP subpanel

We have divided this description of our plans for the Laboratory program into seven parts. The first five sections describe the ongoing technical work and the broad range of physics opportunities available at Fermilab. These are organized into: our plans for the accelerator complex; our plans for facilities for performing experiments; the program of experiments we presently foresee; our plans for involvement with the LHC; and our plans for R & D towards a future facility which recaptures the energy frontier. The final sections summarize: our priorities and our planning strategy for making choices for the future, and our budget request to support the Fermilab program as we approach the fundamental challenges of elementary particle physics over the next ten years

Challenges facing production grids

Today's global communities of users expect quality of service from distributed Grid systems equivalent to that their local data centers. This must be coupled to ubiquitous access to the ensemble of processing and storage resources across multiple Grid infrastructures. We are still facing significant challenges in meeting these expectations, especially in the underlying security, a sustainable and successful economic model, and smoothing the boundaries between administrative and technical domains. Using the Open Science Grid as an example, I examine the status and challenges of Grids operating in production today

Analysis of the Current Use, Benefit, and Value of the Open Science Grid

The Open Science Grid usage has ramped up more than 25% in the past twelve months due to both the increase in throughput of the core stakeholders - US LHC, LIGO and Run II - and increase in usage by nonphysics communities. It is important to understand the value collaborative projects, such as the OSG, contribute to the scientific community. This needs to be cognizant of the environment of commercial cloud offerings, the evolving and maturing middleware for grid based distributed computing, and the evolution in science and research dependence on computation. We present a first categorization of OSG value and analysis across several different aspects of the Consortium's goals and activities. And lastly, we presents some of the upcoming challenges of LHC data analysis ramp up and our ongoing contributions to the World Wide LHC Computing Grid