The Experts below are selected from a list of 81435 Experts worldwide ranked by ideXlab platform
Diane T. Rover - One of the best experts on this subject based on the ideXlab platform.
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BRISK: a portable and flexible distributed Instrumentation System
Proceedings of the SIGMETRICS symposium on Parallel and distributed tools - SPDT '98, 1998Co-Authors: A.m. Bakic, Matt W. Mutka, Diane T. RoverAbstract:Researchers and practitioners in the area of parallel and distributed computing have been lacking a portable, flexible and robust distributed Instrumentation System. We present the Baseline Reduced Instrumentation System Kernel (BRISK) that we have developed as a part of a realtime System Instrumentation and performance visualization project. The design is based on a simple distributed Instrumentation System model for flexibility and extensibility. The basic implementation poses minimalistic System requirements and achieves high performance. We show evaluations of BRISK using two distinct configurations: one emphasizes isolated simple performance metrics; and the other, BRISK’s operation on distributed applications, its built-in clock synchronization and dynamic on-line sorting algorithms.
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SC - Modeling, Evaluation, and Testing of Paradyn Instrumentation System
Proceedings of the 1996 ACM IEEE conference on Supercomputing (CDROM) - Supercomputing '96, 1996Co-Authors: Abdul Waheed, Diane T. Rover, Jeffrey K. HollingsworthAbstract:This paper presents a case study of modeling, evaluating, and testing the data collection services (called an Instrumentation System) of the Paradyn parallel performance measurement tool using well-known performance evaluation and experiment design techniques. The overall objective of the study is to use modeling- and simulation-based evaluation to provide feedback to the tool developers to help them choose System configurations and task scheduling policies that can significantly reduce the data collection overheads. We develop and parameterize a resource occupancy model for the Paradyn Instrumentation System (IS) for an IBM SP-2 platform. This model is parameterized with a measurement-based workload characterization and subsequently used to answer several "what if" questions regarding configuration options and two policies to schedule Instrumentation System tasks: collect-and-forward (CF) and batch-and-forward (BF) policies. Simulation results indicate that the BF policy can significantly reduce the overheads. Based on this feedback, the BF policy was implemented in the Paradyn IS as an option to manage the data collection. Measurement-based testing results obtained from this enhanced version of the Paradyn IS are reported in this paper and indicate more than 60% reduction in the direct IS overheads when the BF policy is used.
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PPSC - Performance analysis of Instrumentation System management policies
1995Co-Authors: Abdul Waheed, Vincent F. Melfi, Diane T. RoverAbstract:Run-time trace data helps to debug and analyze the parallel programs. Obtaining and managing this data during run-time is the responsibility of an Instrumentation System that incurs overhead. In its worst case, this overhead can result in severe perturbation of the behavior of the actual program. This paper presents a queuing model for an Instrumentation System. The purpose is to provide a rigorous mathematical tool that could allow the analysis of the overhead of program behavior due to the Instrumentation System management policies. We summarize the effects of two management policies: FOF and FAOF policies.
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IPPS/SPDP - BRISK: a portable and flexible distributed Instrumentation System
Proceedings 13th International Parallel Processing Symposium and 10th Symposium on Parallel and Distributed Processing. IPPS SPDP 1999, 1Co-Authors: A.m. Bakic, Matt W. Mutka, Diane T. RoverAbstract:Researchers and practitioners in the area of parallel and distributed computing have been lacking a portable, flexible and robust distributed Instrumentation System. We present the Baseline Reduced Instrumentation System Kernel (BRISK) that we have developed as a part of a real-time System Instrumentation and performance visualization project. The design is based on a simple distributed Instrumentation System model for flexibility and extensibility. The basic implementation poses minimalistic System requirements and achieves high performance. We show evaluations of BRISK using two distinct configurations: one emphasizes isolated simple performance metrics; and the other BRISK's operation on distributed applications, its built-in clock synchronization and dynamic on-line sorting algorithms.
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HICSS (2) - A model for Instrumentation System management in concurrent computer Systems
Proceedings of the Twenty-Eighth Hawaii International Conference on System Sciences, 1Co-Authors: Abdul Waheed, Vincent F. Melfi, Diane T. RoverAbstract:An Instrumentation System is a measurement-based performance evaluation abstraction. Management of an Instrumentation System becomes critical when tracing is enabled on an application program that runs for an excessively long period of time. This paper presents queuing models for two Instrumentation System management policies, namely flush-one-when-it-fills (FOF) and flush-all-when-one-fills (FAOF). The performance results obtained analytically are compared to results obtained through trace-driven simulation. An appropriate Instrumentation System management policy ensures optimal usage of the available local memory space to avoid excessive flushes of the local buffers or perturbation of the program behavior. The results show that each of the FOF and FAOF policies is suitable for one of these two objectives: the FAOF policy requires a smaller number of flushes but with greater perturbation; the converse is true for the FOF policy. Therefore, a compromise between these two policies may be needed when implementing the Instrumentation System management policy. >
R. S. Reynolds - One of the best experts on this subject based on the ideXlab platform.
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High Speed Rotor Head Mounted Instrumentation System
1997Co-Authors: Leonard Hee, R. S. ReynoldsAbstract:NASA Ames Research Center has been investigating the air flow of a rotor blade on a UH-60 Blackhawk helicopter in-flight. This paper will address the hardware problems and solutions used to design and fabricate an Instrumentation System on top of a UH-60 main rotor head. The Instrumentation System consisted of 10 data Systems operating in parallel and collected data from 370 sensors that are mounted in four rotor blades and on the rotating rotor head. The data was recorded on board the aircraft and simultaneously down linked to the ground station at 7.5 MHz.
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The Second Generation High Speed Rotor Head Mounted Instrumentation System
1997Co-Authors: John Lewis, R. S. ReynoldsAbstract:NASA Ames Research Center has been investigating the air pressure flow of a rotor blade on a UH-60 Black Hawk helicopter in-flight. This paper will address the changes and improvements due to additional restrictions and requirements for the Instrumentation System. The second generation Instrumentation System was substantially larger and this allowed greatly improved accessibility to the components for ease of maintenance as well as improved gain and offset adjustment capabilities and better filtering.
Abdul Waheed - One of the best experts on this subject based on the ideXlab platform.
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SC - Modeling, Evaluation, and Testing of Paradyn Instrumentation System
Proceedings of the 1996 ACM IEEE conference on Supercomputing (CDROM) - Supercomputing '96, 1996Co-Authors: Abdul Waheed, Diane T. Rover, Jeffrey K. HollingsworthAbstract:This paper presents a case study of modeling, evaluating, and testing the data collection services (called an Instrumentation System) of the Paradyn parallel performance measurement tool using well-known performance evaluation and experiment design techniques. The overall objective of the study is to use modeling- and simulation-based evaluation to provide feedback to the tool developers to help them choose System configurations and task scheduling policies that can significantly reduce the data collection overheads. We develop and parameterize a resource occupancy model for the Paradyn Instrumentation System (IS) for an IBM SP-2 platform. This model is parameterized with a measurement-based workload characterization and subsequently used to answer several "what if" questions regarding configuration options and two policies to schedule Instrumentation System tasks: collect-and-forward (CF) and batch-and-forward (BF) policies. Simulation results indicate that the BF policy can significantly reduce the overheads. Based on this feedback, the BF policy was implemented in the Paradyn IS as an option to manage the data collection. Measurement-based testing results obtained from this enhanced version of the Paradyn IS are reported in this paper and indicate more than 60% reduction in the direct IS overheads when the BF policy is used.
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PPSC - Performance analysis of Instrumentation System management policies
1995Co-Authors: Abdul Waheed, Vincent F. Melfi, Diane T. RoverAbstract:Run-time trace data helps to debug and analyze the parallel programs. Obtaining and managing this data during run-time is the responsibility of an Instrumentation System that incurs overhead. In its worst case, this overhead can result in severe perturbation of the behavior of the actual program. This paper presents a queuing model for an Instrumentation System. The purpose is to provide a rigorous mathematical tool that could allow the analysis of the overhead of program behavior due to the Instrumentation System management policies. We summarize the effects of two management policies: FOF and FAOF policies.
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HICSS (2) - A model for Instrumentation System management in concurrent computer Systems
Proceedings of the Twenty-Eighth Hawaii International Conference on System Sciences, 1Co-Authors: Abdul Waheed, Vincent F. Melfi, Diane T. RoverAbstract:An Instrumentation System is a measurement-based performance evaluation abstraction. Management of an Instrumentation System becomes critical when tracing is enabled on an application program that runs for an excessively long period of time. This paper presents queuing models for two Instrumentation System management policies, namely flush-one-when-it-fills (FOF) and flush-all-when-one-fills (FAOF). The performance results obtained analytically are compared to results obtained through trace-driven simulation. An appropriate Instrumentation System management policy ensures optimal usage of the available local memory space to avoid excessive flushes of the local buffers or perturbation of the program behavior. The results show that each of the FOF and FAOF policies is suitable for one of these two objectives: the FAOF policy requires a smaller number of flushes but with greater perturbation; the converse is true for the FOF policy. Therefore, a compromise between these two policies may be needed when implementing the Instrumentation System management policy. >
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MASCOTS - Vista: a framework for Instrumentation System design for multidisciplinary applications
Proceedings of MASCOTS '96 - 4th International Workshop on Modeling Analysis and Simulation of Computer and Telecommunication Systems, 1Co-Authors: Abdul Waheed, Diane T. Rover, A.m. Bakic, Matt W. Mutka, David B. PierceAbstract:This paper presents a framework, called Vista, for designing Instrumentation Systems (ISs) for various applications that use distributed computing Systems. We define an Instrumentation System as a collection of modules and functions used for collecting data from concurrent processes executed on various nodes across the network. Based on our generic model of an IS, the Vista framework provides various abstract and base classes that help a user to quickly configure an IS for a particular application domain. Vista library is built on top of various operating System services to provide various convenience functions to collect and forward the Instrumentation data. The design of this framework is hierarchical to address diverse user needs. We present the application of this framework to various practical data collection and management problems.
Ahmad Akif Adam - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Instrumentation System for Liquefied Petroleum Gas level monitoring
Journal of Natural Gas Science and Engineering, 2017Co-Authors: Zainal Zakaria, Mariani Idroas, Ariffin Samsuri, Ahmad Akif AdamAbstract:Liquefied Petroleum Gas (LPG) is commonly stored in a highly pressurized cylinder tank, where its liquid level needs to be measured accurately for a safety reason. Currently, the level of LPG is measured using a weighing scale. This approach has been constructed to facilitate the process of LPG level measurement inside a cylinder tank. In this research, a new method is developed by using a non-invasive ultrasonic Instrumentation System for monitoring LPG level in a 14 kilogram cylinder. The Instrumentation System was integrated with the designed experimental rig. Module ultrasonic sensors Truma. LC-V1.15 were attached vertically outside of the cylinder wall on a sensor holder of the experimental rig. The ultrasonic sensors emit the ultrasonic signals and the signals will then propagate through the cylinder wall. The reflected signal was recorded again by the ultrasonic sensors. The reflection of the ultrasonic signal depends on the type of the medium's impedance. The generated signals from the transceiver type of sensors were sent to the Pico Scope Data Acquisition System (DAQ) for data reading. The output voltage signals were processed by the computational data process System, giving a result of the LPG liquid level inside the cylinder. An image of the liquid level in the cylinder was constructed using javascript based programming. The image showed the liquid level in percentage value and a html software was used as the interface in this program. The developed Instrumentation System was able to detect the level of LPG in the cylinder.
P Eskelinen - One of the best experts on this subject based on the ideXlab platform.
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a biosignal Instrumentation System using capacitive coupling for power and signal isolation
IEEE Transactions on Biomedical Engineering, 2007Co-Authors: K V T Piipponen, R Sepponen, P EskelinenAbstract:Requirements for patient safety and a high interference rejection ratio in medical equipment create a demand for effective isolation devices. A System scale approach that uses capacitive coupling for power and signal isolation is presented. In addition, we describe the development of an Instrumentation System prototype that applies microwaves for power exchange and bidirectional data transfer across the isolation barrier. The System consists of an isolated transducer unit, a central unit, and a single coaxial cable between the units. The isolation capacitance is as low as 1.6 pF, inclusive of the digital data transfer and power exchange up to 600 mW of isolated direct current (dc) power. The System is suitable for line-powered biopotential measurements and it is shown that reducing the isolation capacitance from 180 to 1.6 pF improves the power line rejection by 30 dB in a typical electrocardiogram (ECG) measurement setup.