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IEEE 1992 ULTRASONIC SYMP

作者： JEFFERS, RJ FENG, RQ FOWLKES, JB HUNT, JW CAIN, CA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor 48019-2122 MI United States Bioengineering Program University of Michigan Ann Arbor 48019-2122 MI United States Department of Radiology University of Michigan Ann Arbor 48019-2122 MI United States Ontario Cancer Institute Department of Medical Biophysics Toronto ON Canada

ISBN: (纸本)0780305620

Polar solvents, including dimethylformamide (DMF), have been investigated as anticancer drugs. Their potential usefulness is constrained by hepatotoxic effects. The ability to enhance drug cytotoxicity with ultrasound would be valuable in creating locally intense chemotherapy while minimizing effects peripheral to the treatment site. We examined the effects of a non-cytotoxic DMF dose alone and with ultrasound exposure on HL-60 human promyelocytic leukemia cells grown in suspension culture. The cells were insonified in a free field configuration which created little cytotoxicity without the introduction of albumin stabilized microbubbles into the exposure chamber. When microbubbles were introduced, cytotoxicity of DMF and ultrasound was significantly higher than for ultrasound alone. The necessary presence of microbubbles for the enhanced cytotoxicity of DMF by ultrasound suggests that a likely enhancement mechanism is acoustic cavitation which should be initiated by the existence of microbubbles as nuclei. Albumin stabilized microbubbles, similar to those presently used as ultrasound contrast agents, may provide a significant source of nuclei and improve prospects for cancer therapy using acoustic cavitation. © 1992 IEEE.

关键词： Dimethylformamide

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A new scheme for id-based cryptosystems and signatures

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Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an 1992年第5期15卷 605-610页

作者： Laih, Chi-Sung Lee, Jau-Yien Chen, Chin-Hsing Harn, Lein Department of Electrical Engineering National Cheng Kung University Tainan 70101 Taiwan Computer Science Program University of Missouri Kansas MO 64110 United States

This paper proposes a new ID-based cryptographic scheme for implementing public-key cryptosystems and signatures. Instead of generating and publishing a public key for each user, the ID-based scheme permits each user to choose his name or network address as his public key. This eliminates the need of a large public-file and the exchange of private or public keys. The major advantage of the ID-based cryptosystems is that the number of users can be exteneded to t+L users without decreasing the system security when users conspire, where L is the number of the system’s secrets and t is the number of factors in p - 1. © 1992 Taylor & Francis Group, LLC.

关键词： Cryptosystem Digital signature ID-based scheme

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NSF/IEEE CAEME center. An exciting opportunity to align electromagnetic education with the nineties

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computer Applications in engineering Education 1992年第1期1卷 33-33页

作者： Iskander, M.F. CAEME Director Electrical Engineering Department University of Utah Salt Lake City Utah 84112 Dr. Iskander edited two special issues of theJournal of Microwave Power one on “Electromagnetics and Energy Applications” March 1983 and the other on “Electromagnetic Techniques in Medical Diagnosis and Imaging” September 1983. He authored one book onElectromagnetic Fields and Waves published by Prentice Hall in 1992 he edited theCAEME Software Book Vol. I 1991 and he coedited a third book onMicrowave Processing of Materials published by the Materials Research Society in 1991. The holder of seven patents he has contributed 16 chapters to eight research books published more than 90 papers in technical journals and made numerous presentations in technical conferences. In 1983 he received the College of Engineering Outstanding Teaching Award and the College Patent Award for creative innovative and practical invention. In 1984 he was selected by the Utah Section of the IEEE as Engineer of the Year. In 1984 he received the Outstanding Paper Award from the International Microwave Power Institute and in 1985 he received the Curtis W. McGraw ASEE National Research Award for outstanding early achievements by a university faculty member. In 1991 he received the ASEE George Westinghouse National Award for innovation in engineering education. In 1986 Dr. Iskander established the Engineering Clinic Program in the College of Engineering at the University of Utah. Since then the program has attracted more than 45 research projects from 18 companies throughout the United States. He is also the director of the NSF/IEEE Center for Computer Applications in Electromagnetics Education (CAEME). He co-organized symposia on “Microwave Processing of Materials” held in conjunction with Materials Research Society meetings in the Springs of 1990 and 1992 in San Francisco. He also organized several workshops and special sessions in conjunction with IEEE symposia. Dr. Iskander is the editor of the journalComputer Applications i

The National Science Foundation/Institute of electrical and Electronic Engineers (NSF/IEEE) Center for computer Applications in Electromagnetic (EM) Education (CAEME) was funded in early 1990 by the National Science Foundation to stimulate and accelerate the use of computers and software tools in EM education. The Center is managed by the Executive Office of IEEE on behalf of the Antennas and Propagation Society. This organizational structure provided avenues for broad participation by universities, professional societies, and corporations in the Center's activities. In two years of operation, CAEME has organized several workshops and special sessions in international meetings, published its first software book, prepared a lesson on “Electromagnetic Waves” using interactive video, and raised over $ 130,000 from university membership, participating societies, and corporate sponsors. This article summarizes CAEME activities, outlines its organizational structure, and briefly describes the contents of its first software book. Future developments are discussed and avenues for participation are outlined.

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TEST OF CLOSED-LOOP DEGAUSSING ALGORITHM ON A MINESWEEPER ENGINE

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NAVAL ENGINEERS JOURNAL 1992年第3期104卷 219-227页

作者： WINGO, RA HOLMES, JJ LACKEY, MH Robert A. Wingo:is a technical specialist electrical engineer in the Protection Systems Department of the Naval Surface Warfare Center. During his 10 years at NSWC he has been a leader in the development and analysis of systems for the measurement and reduction of static magnetic signatures of mine counter measures vessels and steel hull ships. He currently holds the position of lead scientist of the Engineering Group for the joint U.S.-France Closed-Loop Degaussing Program. His responsibilities have included theory and modeling of static-magnetic fields closed-loop degaussing systems development and implementation scale and full-scale experimentation and the development of fleet magnetic signature measurement facilities. He holds a BSEE degree from Virginia Polytechnic Institute and has published several papers on various topics in magnetic silencing and closed-loop degaussing systems. John J. Holmes:is a principal electrical engineer in the Protection Systems Department of the Naval Surface Warfare Center. Dr. Holmes has been with NSWC for 14 years. During this time he has participated in and technically directed the development of several submarine and surface ship magnetic and electric silencing systems in the ULF (0 to 3 hz) and ELF (3 hz to 3 khz) band. His responsibilities have included threat and vulnerability studies theory and modeling of electromagnetic fields countermeasure systems development scale and full-scale experimentation and data analysis and the development of standards for countermeasure system performance testing and evaluation. He has published over fifty papers on various topics in magnetic silencing and electromagnetic theory. In addition he has participated in several international electromagnetic silencing R&D programs and is a member of the NATO Mine Warfare Working Party. Milton H. Lackey:is a senior physicist in the Protection Systems Department of the Naval Surface Warfare Center. He is currently director of the Center's Magnetic Ship Models Laboratory. During his 30-ye

A closed-loop degaussing technique for MCM (mine countermeasure) class vessels has been developed and tested on a minesweeper engine. The system was designed to accurately predict and degauss the off-board magnetic field signatures from measurements taken on-board a non-magnetic hull naval signature prediction algorithm have been investigated. An on-board sensor configuration, that requires only four single axis gradiometers, has been shown to accurately predict the magnetic signatures of the full-scale engine.

关键词： Warships

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MULTIDATABASE SYSTEMS - AN ADVANCED CONCEPT IN HANDLING DISTRIBUTED DATA

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ADVANCES IN computerS 1991年第C期32卷 149-200页

作者： HURSON, AR BRIGHT, MW Computer Engineering Program Department of Electrical Engineering The Pennsylvania State University University Park Pennsylvania

Multidatabases integrate the data from preexisting, heterogeneous local databases into a distributed environment, and present global users with transparent methods to use the total information in the system. This chapter describes the taxonomy of global information-sharing systems, multidatabase issues, multidatabse design choices, analysis of existing multidatabase systems, and the position of multidatabase systems in the taxonomy. Multidatabase language systems have no constraints on system size, but the tradeoff for achieving this is a multiple-data-source user paradigm and a more complex user interface. Multidatabase issues, such as site autonomy, differences in data representation, and concurrency control are also discussed in the chapter. Site autonomy is a major strength of multidatabases, yet it is also a major constraint on the global system design. Differences in data representation are many and varied, and resolving these differences is a major concern of the global system design. Global updates are a major current restriction in many systems, and the focus of much current research. To make multidatabase systems more useful and efficient, some deficiencies in existing prototypes must be resolved before they can evolve into commercial products, such as global concurrency control, global security, maintenance and administration, and error control and recovery. Multidatabase systems should begin to have a larger impact in the information-processing world as more powerful systems to become generally available in the near future.

关键词： Database Systems

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ACOUSTIC TRANSMISSION OF THE RESPIRATORY SYSTEM USING SPEECH STIMULATION

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IEEE TRANSACTIONS ON BIOMEDICAL engineering 1991年第2期38卷 126-132页

作者： COHEN, A BERSTEIN, AD Department of Electrical and Computer Engineering Biomedical Engineering Program Ben-Gurion University of the Negev Beersheba Israel

Two methods for the analysis of the acoustic transmission of the respiratory system are presented. Continuous speech utterance is used as acoustic stimulation. The transmitted acoustic signal is recorded from various sites over the chest wall. The AR method analyzes the power spectral density function of the transmitted sound, which heavily depends on the microphone assembly and the utterance. The method was applied to a screening problem and was tested on a small database that consisted of 19 normal and five abnormal patients. Using the first five AR coefficients and the prediction error of an AR(10) model, as discriminating features, the system screened all abnormals. An ARMA method is suggested, which eliminates the dependence on microphone and utterance. In this method, the generalized least squares identification algorithm is used to estimate the ARMA transfer function of the respiratory system. The normal transfer function demonstrates a peak at the range of 130-250 Hz and sharp decrease in gain for higher frequencies. A pulmonary fibrotic patient demonstrated a peak at the same frequency range, a much higher gain in the high frequency range with an additional peak at about 700 Hz.

关键词： Microphone Device Component Error of prediction frequency ranges Respiratory System Thoracic Wall power spectral density function TRANSFER FUNCTIONS sound transmission

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CHARACTERISTICS OF JUNCTIONS MADE BETWEEN PB AND BI2SR2CACU2O8+X

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IEEE TRANSACTIONS ON MAGNETICS 1991年第2期27卷 935-938页

作者： YANG, YF NORDMAN, JE Materials Science Program Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

Investigations on the junctions made between Pb and polycrystalline Bi2Sr2CaCu2O8+x (BSCCO) are reported. The BSCCO surfaces were treated with number of methods including mechanically scraping, plasma sputtering, plasma oxidation, and Br etch before junctions were fabricated. The current-voltage characteristics and dynamic resistance (dV/dI) vs voltage have been measured at both 77K and 4.2K. We observed, among other features, a Pb gap structure similar to that seen in Pb/YBa2Cu3O7-delta junctions, a magnetic dependent supercurrent, an asymmetric I-V curve, and narrow resistance peaks. Properties of junctions prepared in different manners are compared. Both XPS and electrical studies indicated that Br etch is not suitable for the BiSrCaCuO system in spite of its successful application in YBa2Cu3O7-delta.

关键词： Plasma measurements Bismuth compounds Plasma applications Plasma properties Strontium Surface resistance Surface treatment Sputtering Oxidation Sputter etching

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SIMPLE APPROACH TO REFLECTANCE ANALYSIS OF BIREFRINGENT STRATIFIED FILMS

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APPLIED OPTICS 1991年第28期30卷 4017-4018页

作者： KNOESEN, A []The author is with the Department of Electrical Engineering Computer Science Organized Research Program on Polymeric Ultrathin Film Systems University of California Davis Davis California 95616

A simple analysis is presented of reflectance from a stratified uniaxial media with the optic axes parallel or perpendicular to the plane of incidence.

关键词： UNIAXIAL FILMS POLED POLYMERS THIN FILM BIREFRINGENT

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An approach to blind equalization of non-minimum phase systems

An approach to blind equalization of non-minimum phase syste...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： W.A. Sethares R.A. Kennedy Z. Gu Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA Department of System Engineering RSPhysSE and Interdisciplinary Engineering Program Faculty of Science Australian National University Canberra ACT Australia

Blind equalization of systems which contain a nonminimum phase component is a difficult task. Minimizing the energy (l/sub 2/ minimization) of the equalizer output (under a fixed tap constraint) cannot be guaranteed to open the eye (to reliably unscramble the message) because it tends to converge to an equalizer setting that contains a reflection of the unstable zeros inside the unit circle. It is shown that, in at least one simple setup involving a mixture of minimum and nonminimum phase elements, an l/sub infinity / minimization of the equalizer output is the appropriate criterion which should be minimized in order to successfully open the eye. Utilizing a finite impulse response equalizer constrained to have a unity coefficient on the center tap, it is shown that for a large enough dimension (depending on the closeness of the zeros of the channel to the unit circle) the eye will be opened. There is no simple (gradient) scheme to exactly implement the l/sub infinity / minimization. The use of a gradient l/sub p/ scheme for large p is proposed.< >

关键词： Blind equalizers Finite impulse response filter Australia Council Information science Predistortion Distortion Cellular neural networks Quadrature amplitude modulation Stability

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FIELD SAMPLING OF RESIDUAL AVIATION GASOLINE IN SANDY SOIL

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GROUND WATER MONITORING AND REMEDIATION 1991年第2期11卷 107-120页

作者： OSTENDORF, DW LEACH, LE HINLEIN, ES XIE, YF 1 David W. Ostendorf is an associate professor in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Dr. Ostendorf is a registered professional engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Water Well Association.2 Lowell E. Leach is an environmental engineer with the Robert S. Kerr Environmental Research Laboratory of the U.S. Environmental Protection Agency (RS Kerr Environmental Research Laboratory U.S. EPA P.O. Box 1198 Ada OK74820). Leach received his B.S. ingeological engineering at the University of Oklahoma in 1959 and has been a registered professional engineer in Oklahoma since 1966. With 29 years of experience in field applications of geological engineering he is responsible for developing methodology for sampling ground water and subsurface materials for the Robert S. Kerr Environmental Research Laboratory.3 Erich S. Hinlein is a research assistant in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include ground water pollution hazardous waste site investigation and transport processes in unconfined aquifers. Hinlein graduated with a B.S. in electrical and computer engineering from the University of Massachusetts at Amherst in May 1985 and entered the Environmental Engineering Master's Degree Program in January 1989.4 Yuefeng Xie is a postdoctoral research associate in the Environmental Engineering Program of the Civil E

Two complementary field sampling methods for the determination of residual aviation gasoline content in the contaminated capillary fringe of a fine, uniform, sandy soil were investigated. The first method featured field extrusion of core barrels into pint-size Mason jars, while the second consisted of laboratory partitioning of intact stainless steel core sleeves. The barrel extrusion procedure involved jar headspace sampling in a nitrogen-filled glove box, which delineated the 0.7m thick residually contaminated interval for subsequent core sleeve withdrawal from adjacent boreholes. Soil samples removed from the Mason jars (in the field) and sleeve segments (in the laboratory) were subjected to methylene chloride extraction and gas chromatographic analysis to compare their aviation gasoline content. The barrel extrusion sampling method yielded a vertical profile with 0.10m resolution over an essentially continuous 5.0m interval from the ground surface to the water table. The sleeve segment alternative yielded a more resolved 0.03m vertical profile over a shorter 0.8m interval through the capillary fringe. The two methods delivered precise estimates of the vertically integrated mass of aviation gasoline at a given horizontal location, and a consistent view of the vertical profile as well. In the latter regard, a 0.2m thick lens of maximum contamination was found in the center of the capillary fringe, where moisture filled all voids smaller than the mean pore size. The maximum peak was resolved by the core sleeve data, but was partially obscured by the barrel extrusion observations, so that replicate barrels or a half-pint Mason jar size should be considered for data supporting vertical transport analyses in the absence of sleeve partitions.

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