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Iranian Conference on Electrical Engineering (ICEE)

作者： Hoda Ahmadinejad Omid Fatemi ECE Department University of Tehran Digital System Level Design Laboratory Tehran Iran University of Tehran Tehran Tehran IR

Predictive modeling has gained much attention in last decade aiming the evaluation of different design points in design Space Exploration (DSE) process. However, predictive model construction still requires costly simulations for every new and unseen application. To reduce the number of simulations, several cross program performance prediction schemes are developed. These schemes can be more efficient if they use application characteristics or signature. The main challenge is to find the best representative characteristics and how they contribute to predictive models. In this paper, we introduce a characteristic to represent the inherent parallelism of applications and to measure performance sensitivity to issue width changes. We show that this characteristic can better predict inherent parallelism than data dependency distance and instruction mix, which are proposed by previous works.

关键词： Decision support systems Electrical engineering Erbium Conferences

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design space pruning of MPSoCs using weighted sub-sampling

Design space pruning of MPSoCs using weighted sub-sampling

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2011 18th IEEE International Conference on Electronics, Circuits and systems, ICECS 2011

作者： Kokhazadeh, Ali Fatemi, Omid Digital System-Level Design Laboratory University of Tehran Tehran Iran

ISBN: (纸本)9781457718458

The sheer size of the design space in embedded MPSoC systems makes the design space exploration become an onerous task for almost all design problems. design space pruning is a procedure by which an exponential design space is trimmed down to a subset that can be explored efficiently without any significant loss of important design configurations. In this paper we propose a design space pruning algorithm that operates based on weighted sub-sampling of design parameters. In the proposed method, the sub-sampling accuracy of each parameter is increased where the slope of at least one design objective with respect to that parameter is large. Simulation results on a case study from multimedia domain, namely Motion JPEG video encoder, show that the proposed method outperforms conventional regular and random methods of sub-sampling while its pruning factor is exponential with the number of design parameters. © 2011 IEEE.

关键词： system-on-chip

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An MOPSO method for mapping multimedia applications onto MP-SOC architectures

An MOPSO method for mapping multimedia applications onto MP-...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Sima Sinaei Omid Fatemi Digital System Level Design Laboratory University of Tehran

ISBN: (纸本)9781424497881;9781424497898

system level modeling and design space exploration has an important role in Multi processor embedded system on chip design. Y-chart modeling is a well-known method for solving design space exploration problem. One of the most important stages in Y-chart approach is mapping an application onto architecture. In this paper, MOPSO algorithm has been proposed to obtain optimized solutions for mapping. The proposed method is tested using the MJPEG application as a case study in terms of accuracy and efficiency. Simulation results show that proposed algorithm will provide the designer with accurate solutions with a considerable reduction in design time. Finally a number of multi objective optimization results are simulated and verified by the Sesame framework.

关键词： Multi Objective Optimization design Space Exploration Application Mapping design methodology Multi Processor system on Chip design year ARCHITECTURE MULTIMEDIA APPLICATION Space Exploration designers hierarchical models Building construction mapping

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design space pruning of MPSoCs using weighted sub-sampling

Design space pruning of MPSoCs using weighted sub-sampling

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： Ali Kokhazadeh Omid Fatemi Digital System-Level Design Laboratory University of Tehran Tehran Iran

关键词： Space exploration Algorithm design and analysis Measurement Pareto optimization design methodology Simulation Accuracy

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ARCHITECTURE AND NETWORKING ISSUES IN SATELLITE systemS FOR PERSONAL COMMUNICATIONS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第1期12卷 33-44页

作者： ANANASSO, F CAROSI, M Received the Electronics and Electrical Communications Degree from the University of Rome in 1973 after which he joined Selenia S.p.A (Rome) as a microwave designer in the Development Laboratory. He was involved in several military and civilian projects concerning microwave subsystems for Radar Avionics and Satellite Communications equipment. In 1981 he joined Telespazio S.p.A. (Rome) as Section Chief in the Space and Advanced Programs Division with responsibilities related to satellite payload and digital transmission channel design. In 1987 he was appointed Associate Professor of Digital Signal Processing at the University of Rome Tor Vergata Electronics Engineering Department. In 1990 he again joined Telespazio where he is now Director of the Advanced Studies and Experimentations Division. He has performed a number of studies for National and International Organizations including ESA EUTELSAT INMARSAT and INTELSAT is author of a Radio Systems book a Chapter (‘Digital transmission channel’) of the ‘Satellite Communication System Design’ book by Plenum Publishing (1993) and over 80 technical papers on communication systems and technology. Received the Electronics and Electrical Communications Degree from the University ‘La Sapienza’ of Rome Italy in 1987. From 1987 to 1990 he worked as a Research Engineer in the INFOCOM department of the University ‘La Sapienza’ of Rome carrying out research on design and performance evaluation of multiple access protocols particularly in the metropolitan area network and in the satellite fields. Since 1990 he has been working in the System Studies and Payload group of Telespazio S.p.A. Rome Italy. He is currently involved in projects sponsored by the European Space Agency and by INMARSAT for communications systems via satellite for mobiles both at study and R&D level. Mr Carosi is a member of the IEEE Communication Society.

The paper expands on some specific aspects of personal communications via satellite, often-although not necessarily-envisaging extensive use of 'small' satellites, using orbits not necessarily coinciding with the geostationary one (36,000 km), but rather at 1000-11,000 km altitude. One key point to be borne in mind is the issue of internetworking between satellite and terrestrial systems. Network integration should be carefully implemented in order to comply with ITU future public land mobile telecommunication systems (FPLMTS) requirements, also accepted in the European Telecommunication Standards Institute (ETSI) universal mobile telecommunication systems (UMTS). In addition to some insight into the technology of small satellites and associated orbits, architectures and networking aspects of most relevant systems providing personal communication services (PCS) are addressed in some detail, and potential applications highlighted. Frequency spectrum allocation is addressed in the light of the 1992 World Administrative Radio Conference (WARC-92), taking into account also multiple access problems and regulatory issues such as Federal Communications Commission (FCC) licensing and spectrum sharing debates. Some remarks on critical technologies and cost conclude the paper.

关键词： PERSONAL COMMUNICATIONS SMALL SATELLITES NETWORKING FREQUENCY SPECTRUM

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ADVANCES IN LONG-RANGE, HIGH-SPEED OPTICAL COMMUNICATION

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NAVAL ENGINEERS JOURNAL 1981年第4期93卷 39-48页

作者： BARTON, GG FELDMAN, S Mr. Sidney Feldman formerly with the Naval Applied Science Laboratory is presently with the Radiation Division of the Naval Surface Weapons Center White Oak Silver Spring Maryland. He planned and supervised laboratory experiments of many optical systems for fleet evaluation several of his designs now being standard in the fleet. He received his BA degree in Physics from Brooklyn College in 1941 and majored in Physics at the Brooklyn Polytechnic Institute. His professional memberships include the Optical Society of America American Association for the Advancement of Science and The Scientific Research Society of North America. He was the recipient of the Naval Ordnance Development Award in 1945 the Superior Achievement Award in 1957 the Quality Salary Increase Award in 1965 the Superior Accomplishment Award in 1967 1970 and 1979. Additionally he has been granted patents for a relamping tool for searchlights (1962) a lamp positioning mechanism for searchlights (1963) a daylnight digital sextant (1973) a portable sextant-computer system (1974) and with Mr. George Barton the remote-controlled LLLTV camera-sextant (1976) the automatic passive LLLTV-rangefinder (1977) and a patent disclosure for the omnidirectional transceiver (1980). Mr. George G. Barton has been employed by the Naval Research Laboratory Washington D. C. for the past ten years in the scientific and military application design engineering and fabrication of low light level TV camera systems. He was previously associated with the Smithsonian Institution and Northwestern University in the application of TV technology in astronomical investigations. He attended New York University Newark College of Engineering and New Mexico State University where he majored in Physical Optics. Presently he is with his own company BISMARC Inc. Harker's Island N.C. where he is involved principally in the design manufacture and marketing of sonar systems such as the unique VIDISEA fishscope research and development in electrooptic systems an

During periods of radio silence under Emission Control, communication depends on the slow ship-to-ship, manual-visual, 8-10 wpm Morse code signaling shutter searchlight employing the ac 1000-watt incandescent or the ac 1000-watt compact arc mercury-xenon lamp. These sources can be replaced by the dc compact arc xenon lamp to provide longer daylight ranges and highspeed (100 wpm teletype, 150 wpm Morse code, voice, etc.) communication since this source has superior brightness and the facility of considerably more rapid modulation. The excessive weight and size of the ac-dc power convertor and modulating circuitry which had prevented use of the dc xenon lamp have been overcome by developments in solid state electronics such as the rapid, high current, simmer-flash, 100 to one light output xenon lamp pulsing using the reliable, uncomplicated, low-cost silicon controlled rectifier shunt switch which could eliminate the mechanical signaling shutter. laboratory and sea evaluations have proved the feasibility of and provided the long daylight high-speed optical communication ranges that could be attained from operation of the dc 1000-watt and 2200-watt xenon lamps at the focus of 12-inch, 18-inch searchlights and in the Fresnel lens omni-directional beacon which a command ship uses to signal all ships in a task force at once. With these advances, optical communication provides the highspeed capability of radio communication, particularly, also, with the new omnidirectional transceiver.

关键词： SHIPS

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