The Experts below are selected from a list of 11919 Experts worldwide ranked by ideXlab platform
R K Barry - One of the best experts on this subject based on the ideXlab platform.
-
conversion from full array shunt to partial array shunt topology for two small explorer class near earth orbiting scientific satellites
1996Co-Authors: R K BarryAbstract:The Space Power Applications Branch of NASA, Goddard Space Flight Center is designing an improved power Subsystem for two Small Explorer-class (SMEX) spacecraft. These spacecraft, the Transition Region And Coronal Explorer (TRACE), and the Widefield infrared Explorer (WIRE) are technological descendants of the SMEX Submillimeter Wave Astronomy Satellite (SWAS) spacecraft and share much of its heritage. Refinements have been made to the SWAS power Subsystem Architecture to take advantage of partial array shunt technology that will make it more dependable and efficient. Additionally, by identifying and targeting the solar array as the Subsystem schedule and budget "tall pole" and designing to reduce that particular component's complexity, the team will provide a spacecraft power Subsystem of increased reliability and reduced cost while proving technology for future small Explorer missions.
-
conversion from full array shunt to partial array shunt topology for wo scientific satellites small explorer class near earth orbiting
1996Co-Authors: R K BarryAbstract:The Space Power Applications Branch of NASA, Goddard Space Flight Center is designing an improved power Subsystem for two Small Explorer-class (SMEX) spacecraft. These spacecraft, the Transition Region And Coronal Explorer WCE), and the Widefield intiared Explorer (WIRE) are technological descendants of the SMEX Submillimeter Wave Astronomy Satellite (SWAS) spacecraft and share much of its heritage. Refinements have been made to the SWAS power Subsystem Architecture to take advantage of partial array shunt technology that will make it more dependable and efficient. Additionally, by identeing and targeting the solar array as the Subsystem schedule and budget "tall pole" and designing to reduce that particular component's complexity, the team wiIl provide a spacecraft power Subsystem of increased reliability and reduced cost while proving technology for fiture small explorer missions. The change prescribed for the TRACE and WIRE power systems is to move from the original design that shunted the full solar array, to a refinement that shunts only a portion of it. The first benefit derived &om this change is enhanced system reliability. In the original design, large foil resistors on the back of the solar array were required to dissipate the power generated by the fidl array. Through carefil analysis it was demonstrated that in the partial array shunt system no such resistors were needed. The FET switches themselves can dissipate the power with greater than 60% margin over NASA derating guidelines. As a consequence this allowed the choice between removing the shunt resistors, resulting in a modest reduction in mass and a significant reduction in solar array and power bus complexity, or leaving in the shunt resistors and reaping an increase in reliability by having cooler-running FET switches. After showing that the FET junction temperatures
Gregory R Ganger - One of the best experts on this subject based on the ideXlab platform.
-
the disksim simulation environment version 4 0 reference manual cmu pdl 08 101
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual cmu pdl 08 101
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
Ayoub Bahnasse - One of the best experts on this subject based on the ideXlab platform.
-
Behavior study of SIP on IP multimedia Subsystem Architecture MPLS as transport layer
2018Co-Authors: Faycal Bensalah, Najib El Kamoun, Mustapha El Hamzaoui, Ayoub BahnasseAbstract:IP Multimedia Subsystem “IMS” is the modular Architecture that provides users with reliable access to multimedia services (voice, video conferencing, interactive services, etc.). However, quality of service and security are one of the main concerns of operators when it comes to multimedia services. The Multi-Protocol Label Switching (MPLS) protocol ensures these two basic needs. IMS is primarily based on the Session Initiation Protocol (SIP) for (i) routing, (ii) establishing, (iii) modifying, and (iv) closing a multimedia session. The SIP protocol represents the most influential protocol in the IMS Architecture. The objective of this paper is to evaluate the performance of the SIP protocols in an IMS Architecture with the MPLS protocol as the transport layer protocol. The evaluation will focus on: (I) the impact of the number of connections on the duration of SIP session establishment and (Ii) the impact of the number of users on the performances of IMS services (VOIP and Videoconferencing).
John S Bucy - One of the best experts on this subject based on the ideXlab platform.
-
the disksim simulation environment version 4 0 reference manual cmu pdl 08 101
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
-
the disksim simulation environment version 4 0 reference manual cmu pdl 08 101
2008Co-Authors: John S Bucy, Jiri Schindler, Steven W Schlosser, Gregory R GangerAbstract:DiskSim is an efficient, accurate and highly-configurable disk system simulator developed to support research into various aspects of storage Subsystem Architecture. It includes modules that simulate disks, intermediate controllers, buses, device drivers, request schedulers, disk block caches, and disk array data organizations. In particular, the disk drive module simulates modern disk drives in great detail and has been carefully validated against several production disks (with accuracy that exceeds any previously reported simulator). It also includes a MEMS-based storage device module. This manual describes how to configure and use DiskSim, which has been made publicly available with the hope of advancing the state-of-the-art in disk system performance evaluation in the research community. The manual also briefly describes DiskSim’s internal structure and various validation results.
M.o. Lei - One of the best experts on this subject based on the ideXlab platform.
-
A general spacecraft power Subsystem Architecture
1995Co-Authors: P.r. Glueck, K.a. Bahrami, M.o. LeiAbstract:The Jet Propulsion Laboratory`s (JPL`s) Multimission Spacecraft Analysis System (MSAS) Project is working to develop a spacecraft operations system that facilitates rapid configuration for future missions. In support of this effort, a general spacecraft power Subsystem Architecture has been developed based on recent and ongoing JPL spacecraft designs. This Architecture defines in general terms the components and relationships that might be present in a specific power Subsystem implementation. The resulting framework allows software modelling of nearly any power Subsystem configuration and enhances the reusability of component functional models. The general Architecture may also be applicable to modular hardware designs. This paper describes the general Architecture and presents several adaptations to specific JPL spacecraft.
