46 research outputs found
PVMWebCluster: Integration of PVM Clusters using Web Services and CORBA
No full textAbstract. We propose a new architecture and its implementation called PVMWebCluster which enables easy parallelization of PVM task execution both onto geographically distributed PVM clusters and within them. Task submission is done by calling Web services that negotiate the best cluster(s) for the task and communicate with clusters via CORBA method invocation. PVMWebCluster supports tightly-coupled high performance demanding parallel applications by using PVM/DAMPVM, implements the idea of controlled cluster sharing among users as in grids and multi-tier applications and finally integrates the components using the latest Web services approach. This architecture gives flexibility, easy access for many users through simple code from many languages and operating systems and future development possibilities. We have implemented a testbed application and evaluated it on a testbed platform consisting of four clusters and eight nodes. Multiple copies have been run on the clusters and also parallelized within each of them using DAMPVM also implemented by the author.
i Title: A Migratable User-Level Process Package for PVM Corresponding Author:
No full textShared, multi-user, workstation networks are characterized by unpredictable variability in system load. Further, the concept of workstation ownership is typically present. For efficient and unobtrusive computing in such environments, applications must not only overlap their computation with communication but also redistribute their computations adaptively based on changes in workstation availability and load. Managing these issues at application level leads to programs that are difficult to write and debug. In this paper, we present a system that manages this dynamic multi-processor environment while exporting a simple message-based programming model of a dedicated, distributed memory multiprocessor to applications. Programmers are thus insulated from the many complexities of the dynamic environment at the same time are able to achieve the benefits of multi-threading, adaptive load distribution and unobtrusive computing. To support the dedicated multi-processor model efficiently, the system defines a new kind of virtual processor called User-Level Process (ULP) that can be used to implement efficient multi-threading and application-transparent migration. The viability of ULPs is demonstrated through UPVM, a prototype implementation of the PVM message passing interface using ULPs. Typically, existing PVM programs written in Single Program Multiple Data (SPMD) style need only be re-compiled to use this package. The design of the package is presented and the performance analyzed with respect to both micro-benchmarks an
Influence of composition and powder/water ratio on adhesion strength and initial viscosity of powder-type denture adhesives based on CMC-Na and PVM-MA
No full textNagasaki University (長崎大学)博士(歯学)We evaluated the influence of the composition and powder/water (P/W) ratio of powder-type denture adhesives (DA) based on sodium carboxymethyl cellulose (CMC-Na) and poly(methyl vinyl ether-maleic anhydride) (PVM-MA) on the strength of adhesion to acrylic resin and initial viscosity. Twenty types of DA were prepared by mixing CMC-Na and PVM-MA at various weight ratios with distilled water in P/W ratios ranging from 0.125 to 0.500. Adhesion strength and viscosity were measured using a universal testing machine and a controlled-stress rheometer, respectively. A higher percentage of CMC-Na and higher P/W ratios resulted in higher adhesion strength and viscosity. The effect of the CMC-Na/PVM-MA weight ratio on adhesion strength and viscosity was larger than that of the P/W ratio. DA with higher viscosity had higher adhesion strength. These results suggest that the adhesion strength and initial viscosity of powder-type DA can be controlled via the P/W ratio and the CMC-Na/PVM-MA weight ratio.長崎大学学位論文 学位記番号:博(医歯薬)甲第1143号 学位授与年月日:平成31年3月20日Author: Hitomi Okazaki, Kazuhiro Yoshida, Takafumi Egoshi, Kazuma Takase and Hiroshi MurataCitation: Dental Materials Journal,38(6), pp.994?1001; 2019Nagasaki University (長崎大学), 博士(歯学) (2019-03-20)doctoral thesi
Fluoride release and anti-erosive effects of dentifrices containing PVM/MA copolymers
No full textObjective: To evaluate fluoride release from dentine discs and study the effects of dentine tubule occlusion and erosion prevention of dentifrices containing fluoride and PVM/MA copolymers in a cycling erosive challenge model. Methods: Human dentine discs, 15 in each group, were eroded by 1.0% citric acid and treated by ProNamel (R) (PRN, 1450 ppm fluoride), Colgate (R) Total Sensitive (CTS, 1100 ppm fluoride), a prototype dentifrice containing 5000 ppm fluoride and 2% PVM/MA copolymers (PVD) and distilled water (control). Fluoride release from each dentine disc was evaluated every 2 h in a 12-h period. For cycling erosive challenges, dentine discs were treated by dentifrice slurries twice daily, followed by immersion in saliva and erosive challenges by orange juice. Dentine discs were stored in saliva between treatment cycles and the cycling erosive challenges were repeated for 15 days. On days 5, 10, and 15, size of dentine tubule openings and level of dentine tubule occlusion were evaluated with a 3D scanning microscope. Results: PVD released more fluorides than other dentifrices in a 12-h period (p < 0.05). CTS released more fluorides than PRN at 2, 4, 6, and 8 h following a single application (p < 0.05). The size of the dentine tubules was smaller and the number of occluded dentine tubules was greater in the CTS and PVD groups than those in the control and PRN groups on day 15 of the erosive challenges. Conclusion: Bioadhesive PVM/MA copolymers facilitate fluoride retention and release from dentine discs, and promote dentine tubule occlusion and erosion prevention when combined with hydrated silica particles. (C) 2012 Elsevier Ltd. All rights reserved.Dentistry, Oral Surgery & MedicineSCI(E)PubMed1ARTICLE2148-1544
Developing interest management techniques in distributed interactive simulation using Java
No full textBandwidth consumption in distributed real time simulation, or networked real time simulation, is a major problem as the number of participants and the sophistication of joint simulation exercises grow in size. The paper briefly reviews distributed real time simulation and bandwidth reduction techniques and introduces the Generic Runtime Infrastructure for Distributed Simulation (GRIDS) as a research architecture for studying such problems. GRIDS uses Java abstract classes to promote distributed services called thin agents, a novel approach to implementing distributed simulation services, such as user defined bandwidth reduction mechanisms, and to distributing the executable code across the simulation. Thin agents offer the advantages of traditional agents without the overhead imposed by mobility or continuous state, which are unnecessary in this context. We present our implementation and some predicted results from message reduction studies using thin agent
Dress fashions of Royalty: Kotte kingdom of Sri Lanka
No full textThis collection of writings provides an intensive reading
of dress fashions of royalty which intensified Portuguese
political power over the Kingdom of Kotte. The royalties
were at the top in the social strata eventually known to be the
fashion creators of society. Their engagement in creating and
practicing dress fashion prevailed from time immemorial. The
author builds a sound dialogue within six chapters’ covering
most areas of dress fashion by incorporating valid recorded
historical data, variety of recorded visual formats cross
checking each other, clarifying how the period signifies a
turning point in the fashion history of Sri Lanka culminating
with emerging novel dress features. This scholarly work is
very much vital for university academia and fellow researches
in the stream of Humanities and Social Sciences interested in
historical dress fashions and usage of jewelry. Furthermore,
the content leads the reader into a new perspective on the
subject through a sound dialogue which has been narrated
through validated recorded historical data, recorded historical
visual information, and logical analysis with reference to
scholars of the subject area. Therefore the reader is guided
into cross referencing over a variety of data gradually and
will gain reliable and analytical interpretation of the subject
About Parallel Programming: Paradigms, Parallel Execution and Collaborative Systems
No full textIn the last years, there were made efforts for delineation of a stabile and unitary frame, where the problems of logical parallel processing must find solutions at least at the level of imperative languages. The results obtained by now are not at the level of the made efforts. This paper wants to be a little contribution at these efforts. We propose an overview in parallel programming, parallel execution and collaborative systems.Parallel Programming, Parallel Execution, Collaborative systems, Collaborative parallel execution
A shift resistant encoding in a rotor system
No full textIn this report the goals is to theoretically construct a shift resistant encoding in a rotor system. The report starts with an overview of the rotor space. In the context of which the difference between PVM and POVM is highlighted. After this overview, the shift resistant encodings are discussed. These two concepts are then combined and a shift resistant encoding in the rotor space is presented. Lastly a system which hints at an implementation is presented.. Of this system the Hamiltonian is discussed.Applied Mathematics | Applied Physic
Design, construction and evaluation of the CSU optical fog detector
No full textJuly 2001.Also issued as Scott E. Emert's thesis (M.S.) -- Colorado State University, 2001.The goal of this project was to develop an inexpensive cloud/fog detector that could be used to automate sampling equipment at remote (unmanned) cloud/fog research sites. A secondary objective was to test the ability of this sensor to measure/track trends in fog/cloud liquid water content (LWC). This characteristic is important because LWC is a significant indicator of a cloud's ability to process aerosols and gases and changes in LWC often correspond to changes in fog/cloud solute concentration. The following actions were taken to help realize these objectives. An evaluation of the use of commercially available optical components for fog detection has been performed. The research reinforced the need to have an inexpensive cloud/fog detector that could be used to automate sampling equipment at remote (unmanned) cloud/fog research sites. No such instrument is currently available commercially. Requirements for components of the CSU Optical Fog Detector (OFD) were defined. Important factors included transmitter wavelength and modulation characteristics, detector sensitivity, and component stability/durability over a range of environmental conditions. Readily available commercial components were utilized to ensure the sensor could be built economically. Laboratory tests in a glove box filled with artificially generated fog proved that optical components purchased from Banner Engineering were capable of monitoring changes in fog liquid water content (L WC) when operated in a light attenuation mode. After an initial calibration, the signal from the CSU OFD was found to correlate strongly with LWC measured by a Gerber Scientific Particulate Volume Monitor (PVM-100). Theoretical calculations of attenuation of 880 run light passing through a population of fog drops were completed. The results indicated extinction decreases as the drops are shifted to larger sizes (with a fixed LWC and lognormal distribution breadth). Accordingly, the response of the CSU OFD is expected to vary with mean fog/cloud drop size. Numerous fog detector design configurations were tested and the current attenuation design of the CSU optical fog detector was deemed successful in that it provides, at a minimum, an inexpensive switch capable of automating remote fog sensing equipment. It also provides useful information concerning fog LWC. Two calibrated OFD's were compared to PVM LWC measurements during initial field tests of orographic clouds at Storm Peak Laboratory (SPL) in Steamboat Springs, Colorado. The combined results from both OFD's overall time periods yield a regression equation of LWCofd = 0.99 * LWCpvm with a correlation coefficient of 0.92. Tests performed in the absence of fog on top of our laboratory in Fort Collins provided a measure of OFD baseline noise. Analysis of the observed noise yielded a minimum detection limit of 4.4 mg m·3 for the OFD and a comparable value (5.6 mg m·3) for the PVM. The OFD was incorporated in several automated fog sampling systems deployed in California's San Joaquin Valley as part of the California Regional Particulate Air Quality Study (CRP AQS). The OFD performed well as a fog detector and provided some insight into fog LWC. LWC measurements by a PVM and a co-located OFD showed good correlation (R2 = 0.91) and only modest bias (LWCofd = 1.16 LWCpvm) during an extended radiation fog episode.Sponsored by the National Science Foundation ATM-9980540, and the San Joaquin Valleywide Air Pollution Study Agency
PERMEABILITY OF BINARY POLYMER FILMS AS A CONTROLLED RELEASE MECHANISM
No full textAn investigation was undertaken to study the feasibility of employing a binary polymeric film, consisting of a highly water-soluble and an essentially water-insoluble component, as a controlled release pharmaceutical film coating. Upon exposure to alimentary fluids, the water-soluble polymer of the binary film was intended either to produce swelling of the coating or to be preferentially leached out from the coating leaving a porous but intact film network composed mainly of the insoluble polymer, through which diffusion and release of drug would take place. A completely water-soluble copolymer, poly(methyl vinyl ether/maleic anhydride) of PVM/MA was found to be compatible over a wide range of proportions with the water-insoluble methyl or ethyl methacrylates. Transparent, clear stable binary films were obtained by dissolving the PVM/MA and methacrylates in a common solvent, ethyl acetate, and casting free films on glass plates. The permeability of the free binary films of various grades of PVM/MA and methacrylates was measured in a diffusion cell maintained at 37(DEGREES), using amaranth in buffer solutions as the diffusing solute. The films were found to swell insignificantly in simuated gastric fluid and little diffusion occured. In the simulated intestinal fluid, which has a pH (7.50) well above the pK(,1) of the PVM/MA carboxylic groups, the binary films swelled due to the electrostatic repulsion of the negative charges on the dissociated PVM/MA carboxylic acid groups. The diffusion profile of amaranth across the binary films exhibited three distinct portions: a lag time, a zero order permeation rate period and an exponential rate period. During the lag time, water molecules started to penetrate the binary film hydrolyzing the PVM/MA anhydride to diacid and the film began to swell. As the swelling reached its equilibrium state, film permeability became and maintained constant throughout the entire zero order permeation rate period, after which the PVM/MA molecules began to leach out from the swollen binary film and the permeation rate increased exponentially with time. The permeation lag time of the binary films was observed to be directly proportional to the dry film thickness while the zero order and exponential permeation rates were inversely related to thickness. . . . (Author\u27s abstract exceeds stipulated maximum length. Discontinued here with permission of school.) UM
