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Novel mapping storage architecture enabling tens of thousands of channels on a personal computer platform

Novel mapping storage architecture enabling tens of thousand...

Proceedings of the 1996 18th Annual International conference of the IEEE Engineering in Medicine and Biology Society. Part 4 (of 5)

作者： Witkowski, Francis X. Penkoske, Patricia A. Plonsey, Robert Kavanagh, Katherine M. Giles, Wayne R. Spano, Mark L. Ditto, William L. U. of Alberta Sch of Medicine Edmonton Canada

The electrophysiological mechanisms underlying cardiac arrhythmias are studied by determining the spatiotemporal progression of cardiac depolarization and repolarization, termed cardiac mapping. Analysis of transient events requires information to be obtained from multiple sites simultaneously. The most significant problem with the design of such systems has been the large amount of data storage required and the rapidity of the composite data stream. Mapping systems with 500 simultaneous channels are common, and 4,000 channel systems have been envisioned. We report a relatively simple approach to this data storage problem that uses commercially available frame grabber technology coupled to a personal computer. With this approach we have developed a storage system capable of 24,000 channels sampled at 1 Khz with 12 bit resolution. Hybrid mapping systems incorporating optical recording systems utilizing voltage sensitive dyes from devices such as CCD cameras as well as conventional extracellular electrograms can simultaneously utilize this approach.

关键词： Electrophysiology

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Economic justification of an integrated Oil Movement & storage (OM&S) control system

Economic justification of an integrated Oil Movement & Stora...

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Proceedings of the 1996 International conference on advances in Instrumentation and Control. Part 2 (of 2)

作者： Agrawal, Suresh S. ABB Industrial Systems Inc Houston United States

The off-site operations in a typical refinery involve the movement and storage of raw materials, intermediate and finished products from tanks to processing units and vice versa. This operation is often termed as Oil Movement and storage (OM&S). Any control automation of processing units provides consistent product quality, better conversion yields, stable and safe operations and results in big tangible and intangible benefits such as overall plant efficiency, better usage of planning and scheduling and management information systems, etc. However, the implementation of an automation system for the Oil Movement & storage system requires to carry out an accurate cost and benefits analysis for its economic justifications as there are both tangible and intangible benefits and they must be explored thoroughly. This paper discusses methodology to analyze the OM&S operational data and calculate tangible benefits related to automation of material movement in a refinery. The paper discusses briefly an over-all strategy for the implementation of OM&S automation systems and highlights its salient features.

关键词： Distributed parameter control systems

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advances in three-dimensional SAR from practical apertures

Advances in three-dimensional SAR from practical apertures

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conference on Radar Processing, technology, and Applications

作者： Knaell, K Naval Surface Warfare Ctr. (United States)

ISBN: (纸本)0819422339

Three-dimensional images have been produced from SAR data limited to curved aperture paths by imaging techniques usually associated with two dimensional image resolution enhancement. CLEAN and IMP/RELAX algorithms have produced images for two different measurement scenarios. Dynamic range of CLEAN images are dependent upon levels at which artifacts occur although valid scatterers appear below such levels. Artifacts occur due to focusing errors in IMP/RELAX images and in addition due to sidelobe leakage effects in CLEAN images. These are accentuated by the very large sidelobes of shallow apertures. Autofocused images are significantly sharper than those from initial aperture estimates. Methods to expand the processed image volume will extend the general usefulness of this technique as will methods to estimate and display subtle variations in fully populated 3D image volumes. For these purposes resampeling of data onto a rectilinear grid may allow use of image estimation techniques already proven useful for 2D imaging.

关键词： 3D SAR CLEAN IMP RELAX radar synthetic aperture image

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Geometric hashing for query localization in image databases

Geometric hashing for query localization in image databases

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conference on Multimedia storage and Archiving Systems

作者： SyedaMahmood, T Xerox Webster Research Ctr. (United States)

ISBN: (纸本)0819423181

Image indexing, namely, the problem of retrieving content information from images in response to queries. is a key problem underlying several operations in image databases. Indexing for object queries, in particular, is a difficult problem, as it requires localizing an unanticipated object in unsegmented images. This inevitably involves search, a computationally intensive operation when based entirely on image features. It is desirable to have efficient data structures that avoid the need for sequential search through images and their features for query localization, Conventional data structures used for database organization are not adequate for image indexing where the object query has to be located in images depicting changed imaging conditions that include pose changes and occlusions. In this paper: we explore the use of a geometric hash table as a suitable data structure for fast image indexing. The technique of geometric hashing has been used in computer vision for indexing a library of models to find candidate model objects for recognition in the isolated image region. Here, however, we use geometric hashing as a technique of fast query localization in unsegmented images of a database. Specifically we show that by using three consecutive features along a curve as basis points for affine invariance. a hash table can be constructed for images that is quadratic in the number of features. The resulting indexing method is also quadratic in the number of features. The query localization by geometric hashing is demonstrated for the problem of indexing of handwritten documents based on handwriting pattern queries.

关键词： databases Affine motion model Visual process modeling Computer vision technology Image processing Machine vision data modeling Object recognition Binary data Reliability

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Holographic interference method for investigation of wave transport systems

Holographic interference method for investigation of wave tr...

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2nd International conference on Vibration Measurements by Laser Techniques - advances and Applications

作者： Palevicius, A Ragulskis, M Kaunas Jesuit High School (Lithuania) Kaunas Univ. of Technology (Lithuania)

ISBN: (纸本)0819422649

The original two coordinate step wave motors of synchronous type are analyzed. In them the output member is pushed by the standing waves excited in the input member. The input link may be a rectangular plate or a cylinder or similar. The output member is pressed to the working surface of the input member by the elastic-dissipative elements. The positions of the nodal and peak points of the input member may be changed in various ways. The created model and the performed research of the dynamics determine the characteristics of those motors. The experimental research is complicated because in the input member for example in case of a rectangular plate besides of the orthogonal standing waves the waves of various frequencies travelling and non orthogonal and of damped type arise. That is why for the solution of those problems the method is created based on the method of laser holography and the research is performed. The results of research are effective in the creation of advanced constructions of step motors of the types analyzed.

关键词： Holography Analytical research Wave plates Chemical elements Mathematical modeling data modeling Differential equations optical testing Systems modeling Shape analysis

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Vertical-cavity surface-emitting lasers come of age

Vertical-cavity surface-emitting lasers come of age

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conference on Fabrication, Testing, and Reliability of Semiconductor Lasers

作者： Morgan, RA Lehman, JA HibbsBrenner, MK HONEYWELL TECHNOL CTR PLYMOUTHMN 55441

ISBN: (纸本)0819420573

This manuscript reviews our efforts in demonstrating state-of-the-art planar, batch-fabricable, high-performance vertical-cavity surface-emitting lasers (VCSELs). All performance requirements for short-haul data communication applications are clearly established. We concentrate on the flexibility of the established proton-implanted AlGaAs-based (emitting near 850 nm) technology platform, focusing on a standard device design. This structure is shown to meet or exceed performance and producibility requirements. These include > 99% device yield across 3-in-dia. metal-organic vapor phase epitaxy (MOVPE)-grown wafers and wavelength operation across a > 100-nm range. Recent progress in device performance [low threshold voltage (V_th equals 1.53 V); threshold current (I_th equals 0.68 mA); continuous wave (CW) power (P_cw equals 59 mW); maximum and minimum CW lasing temperature (T equals 200 degree(s)C, 10 K); and wall-plug efficiencies ((eta) _wp equals 28%)] should enable great advances in VCSEL-based technologies. We also discuss the viability of VCSELs in cryogenic and avionic/military environments. Also reviewed is a novel technique, modifying this established platform, to engineer low-threshold, high-speed, single- mode VCSELs.

关键词： VCSELs optical interconnects data links semiconductor lasers LANs

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Daimler-Benz Aerospace/Dornier SAR interferometric sensing system: Experimental study

Daimler-Benz Aerospace/Dornier SAR interferometric sensing s...

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conference on Laser Radar technology and Applications

作者： Faller, NP Fritsch, B Meier, EH Sieber, AJ DAIMLER BENZ AEROSP DORNIERGERMANY

ISBN: (纸本)0819421294

The DO-SAR system consists of an airborne SAR sensor unit and ground-based image processing equipment. It has been built in the late eighties. In order to study algorithms, there was the need to generate dual frequency multipolarization data simultaneously. The DO-SAR images allow a comparison on a pixel by pixel basis. The system has been enhanced to along track and across track interferometry. The across track modes are used to generate height profiles with high accuracy. The along track interferometry can be used to estimate the velocity of targets on ground and the velocity of the aircraft. The system has been operating since 1989. It has been used overall in Europe for maritime and oceanic missions. It was used to fly over flooded areas and it provides simultaneous images together with SIRC, in Denmark and Germany. Presently, it is used to generate interferometric single path images in tropic areas in order to classify the tropical forests.

关键词： Interferometry Antennas Synthetic aperture radar Sensors Image processing Global Positioning System Calibration data storage Reflectors Sensing systems

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Custom ASIC VLSI device for asynchronous transfer mode

Custom ASIC VLSI device for asynchronous transfer mode

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1996 IEEE International Solid-State Circuits conference

作者： Thomann, M MICRON TECHNOL BOISEID

ISBN: (纸本)0780331370

Multiplexing of ATM networks requires flexible switches that efficiently handle data at Gb/s speed. The CellRAM is a single-chip solution implementing a low-cost, low-power ATM multiplexing and switching system. The CellRAM uses a shared memory architecture with 8 input and 8 output, double-buffered, serial accessible, memory ports and a 4Mb DRAM memory core. The CellRAM is in a 0.54μm, 3V double-metal, triple-poly process and is packaged in a 184-pin, quad-flat pack. The CellRAM delivers 1.391Gb/s net ATM cell bandwidth operating at a 43.5MHz clock rate. Supporting unicast and multicasting functions, the CellRAM has all the necessary features for implementing a switch. This architecture anticipates evolutionary increases in memory density with advances in DRAM technology.

关键词： Random access storage

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Proceedings of the 1996 6th Quantum Electronics and Laser Science conference, QELS

Proceedings of the 1996 6th Quantum Electronics and Laser Sc...

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Proceedings of the 1996 6th Quantum Electronics and Laser Science conference, QELS

The proceedings contains 360 papers. Topics discussed include near field optical microscopy, data storage and display technology, high order harmonic generations, condensed phase cavity quantum electrodynamics, guided wave frequency division, ultrafast dynamics, Bose-Einstein condensation, semiconductor lasers, second harmonic generation, vertical cavity surface emitting lasers, solitons, self-trapping in quadratic media and instabilities, semiconductor quantum wells, atomic and molecular physics, strong field physics, atomic beam control, nonlinear optical materials, excitation dynamics in semiconductors, photorefractive materials, amplification without inversion, quantum theory and measurement, coherent atomic beams, quantum optics and noise, and multiphoton spectroscopy.

关键词： Quantum theory

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Trends in optical storage

Conference Proceedings - Lasers and Electro-Optics Society A...

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conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 1996年 68-69页

作者： van Uijen, Cees M.J. Philips Research Lab Eindhoven Netherlands

The impressive growth of the optical storage market is largely due to the success of the compact disc (CD) system. Initially positioned as a new audio carrier, it now also finds widespread application as CD-ROM. New systems are expected to further strengthen optical storage as a cost-effective and robust technology for data exchange. This paper elucidates more on these CD trends.

关键词： optical data storage

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