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作者： Long, Christopher J. Eddington, Donald K. Colburn, H. Steven Rabinowitz, William M. Speech and Hearing Sciences Program Div. of Hlth. Sci. and Technology Massachusetts Inst. of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Research Laboratory of Electronics Massachusetts Inst. of Technology 50 Vassar Street Cambridge MA 02139 United States Cochlear Implant Research Laboratory Dept. of Otology and Laryngology Harvard Medical School 243 Charles Street Boston MA 02114 United States Hearing Research Center Biomedical Engineering Department Boston University 44 Cummington Street Boston MA 02215 United States Bose Corporation The Mountain Framingham MA 01701 United States MRC-CBU 15 Chaucer Rd. Cambridge CB2 2EF United Kingdom

Experiments were conducted with a single, bilateral cochlear implant user to examine interaural level and time-delay cues that putatively underlie the design and efficacy of bilateral implant systems. The subject's two implants were of different types but custom equipment allowed presentation of controlled bilateral stimuli, particularly those with specified interaural time difference (ITD) and interaural level difference (ILD) cues. A lateralization task was used to measure the effect of these cues on the perceived location of the sensations elicited. For trains of fixed-amplitude, biphasic current pulses at 100 pps, the subject demonstrated sensitivity to an ITD of 300 μs, providing evidence of access to binaural information. The choice of bilateral electrode pair greatly influenced ITD sensitivity, suggesting that electrode pairings are likely to be an important consideration in the effort to provide binaural advantages. The selection of bilateral electrode pairs showing sensitivity to ITD was partially aided by comparisons of the pitch elicited by individual electrodes in each ear (when stimulated alone with fixed-amplitude current pulses at 813 pps): specifically, interaural electrodes with similar pitches were more likely (but not certain) to show ITD sensitivity. Significant changes in lateral position occurred with specific electrode pairs. With five bilateral electrode pairs of 14 tested, ITDs of 300 and 600 μs moved an auditory image significantly from right to left. With these same pairs, ILD changes of 11% of the dynamic range (in μApp) moved an auditory image from the far left to the far right - significantly farther than the nine pairs not showing significant ITD sensitivity. However, even these nine pairs did show response changes as a function of the interaural (or confounding monaural) level cue. Overall, insofar as the access to bilateral cues demonstrated herein generalizes to other subjects, it provides hope that the normal binaural advantages fo

关键词： Acoustics

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Working ratio estimation method for a long distance fixed wireless access (22 GHz band, 6.3 Mbit/s) link

Working ratio estimation method for a long distance fixed wi...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Y. Ohmiya K. Katagishi A. Vasilache T. Asami H. Murakami K. Toraichi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba-shi Ibaraki Japan Institute of Information Sciences and Electronics University of Tsukuba Tsukuba-shi Ibaraki Japan Japan Science and Technology Corporation University of Tsukuba TARA Center Ibaraki Japan KDDI R&D Laboratories Inc. Kamifukuoka-shi Saitama Japan KDDI Corporation KDDI bldg. Shinjuku-ku Tokyo Japan

This paper discusses a method to determine the optimal node location before a long distance FWA network (22 GHz band, 6.3 Mbit/s) is set. During our 3 years experiment, we found out that the long distance FWA net with 2 links (about 60 km) was down for approximately 42 hours per year due to heavy rain fall conditions. This means that the long distance FWA net is practicable to some extent. We discuss a method to estimate the working ratio between two unknown locations using AMeDAS weather data. By using this method, an appropriate node location can be decided before FWA net is deployed. This approach can improve the working ratio in the sense of link-up continuation.

关键词： Rain Space technology Costs Systems engineering and theory Research and development Laboratories Telegraphy Delay Interference Space stations

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Linking simulation tools to laboratory experiments: Teaching design verification in engineering technology

Linking simulation tools to laboratory experiments: Teaching...

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2002 ASEE Annual Conference and Exposition: Vive L'ingenieur

作者： Porter, Jay R. Ochoa, James Tumati, Sanjay Texas A and M University Department of Engineering Technology Texas A and M University Department of Electrical Engineering Texas A and M Electronics Eng. Technology Program

The development and implementation of measurement tools that can be used to integrate design simulation and verification into a single process are discussed. The LabVIEW virtual instrumentation programming environment is being used to create measurement tools that seamlessly compare simulation of both analog and digital circuits to measured results. A digital stimulus and response tester for PLD circuits and a frequency response tester for analog devices are suggested to leading to more efficient use of lab time. It is suggested that the development of new instrumentation, on the analog side, can allow students to investigate concepts such as analog transients and harmonic distortion.

关键词： electronics engineering

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Suppression of boron penetration by hot wire CVD polysilicon

Suppression of boron penetration by hot wire CVD polysilicon

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International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： A.V. Vairagar S.B. Patil D.J. Pete P.C. Waghmare R.O. Dusane N. Venkatramani V. Ramgopal Rao Interdisciplinary Program in Reliability Engineering Indian Institute of Technology Bombay Mumbai India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Mumbai India Advanced Center for Research in Electronics Indian Institute of Technology Bombay Mumbai India Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai India

In the current and future deep sub-micron technologies, boron penetration through the gate dielectric is a severe reliability concern for the dual gate CMOS technology. In this paper we report results of our attempts to exploit the potential of Hot Wire CVD (HWCVD) for depositing poly-Si gate for CMOS technology. The effect of grain size of poly-Si gate on boron penetration is studied by varying the poly-Si grain size through variation in the HWCVD parameters.

关键词： Boron Wire CMOS technology Grain size Gases Temperature Hydrogen CMOS process Tungsten Surface cracks

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Paradigms and scope of engineering technology education

Paradigms and scope of engineering technology education

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Helps, C. Richard G. Brigham Young University Dept. of Electronics Engineering Technology Program BYU

The modified form of the "Knowing, Thinking, Doing" model and "Vision, structure, Detail" model was discussed. The two models were complementary in nature having different strengths and limitations and emphasized different aspects of technology education. A complete description of the required thinking skills was developed to define four-year engineering technology program. However, the combination of the two models leads towards a clearer vision of engineering technology education.

关键词： engineering education

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Problem solving in engineering technology: Creativity, estimation and critical thinking are essential skills

Problem solving in engineering technology: Creativity, estim...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Lunt, Barry M. Helps, C. Richard G. Electronics Engineering Technology Brigham Young University Dept. of Electron. Eng. Technology Brigham Young University Provo UT Electronics Eng. Technology Program BYU

The process of design, which is a problem-solving process in engineering technology, is discussed. It is suggested that students should be taught the skills that will make them more proficient in design. Three key skills which are essential are creativity, estimating, and critical thinking. The steps in the process of design comprise developing of functional specifications and the concept design, generating design alternatives, selecting and modeling the best alternatives, and testing and verifying the design.

关键词： engineering education

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Protein titration control and monitoring system: a collaborative, real-world course project

Protein titration control and monitoring system: a collabora...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Vaughan, Anthony Abe, Tomoki Kurpad, Krishna Thurlkill, Richard Porter, Jay Morgan, Joseph Texas A and M University Electronics Engineering Technology Texas A and M University Engineering Technology Program Texas A and M University Electron. and Telecom. Eng. Technol.

Currently, The Texas A&M University System Health Science Center College of Medicine uses a manually-operated system for the pH titration of histidine penta-peptides, model compounds and proteins. The data collected from this system will be used to determine the pKa of the histidine side-chain in these different compounds. This information will be added to the world-wide data base of pKa's collected and will contribute to our understanding of how pKa's are affected by their local environment and will contribute to the development of new drugs and/or drug delivery systems. To increase data collection efficiency, the Health Science Center approached the electronics and Telecommunications engineering technology programs about automating the titration system. The Protein Titration Control and Monitoring system was assigned as the course project in an undergraduate data acquisition and process control class that is taught at the junior-level. The students were required to work in four to five-person teams to develop a complete system-level design, implement the design in hardware and software, and test and deliver an operational system to the sponsor. The software was designed and implemented using National Instruments LabVIEW graphical development environment and a standard data acquisition card installed in a desktop computer. The system accepts inputs from the researcher, automates the entire titration and data collection process, databases the pertinent information, and correctly terminates the experiment. The system can be operated in a local mode or the experimenter can initiate a data collection session, monitor the progress of the experiment in real time, and access the recorded results via the Internet using LabView Data Socket technology.

关键词： engineering education

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Multi-converter power electronic systems: definition and applications

Multi-converter power electronic systems: definition and app...

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： A. Emadi M. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Department of Electrical Engineering Advanced Vehicle Systems Research Program Texas A and M University College Station TX USA

In multi-converter power electronic systems, different converters such as DC/DC choppers, DC/AC inverters, and AC/DC rectifiers are used in source, load, and distribution subsystems to provide power at different voltage levels and forms. Most of the loads are also in the form of power electronic converters and motor drives. The most popular examples of these systems are automotive systems and more electric/hybrid electric vehicles. These systems have unique characteristics, dynamics, and stability problems that are just beginning to be appreciated. In this paper, we take a closer look at multiconverter power electronic systems and address the fundamental problems faced in these systems.

关键词： Power electronics Analog-digital conversion Choppers Inverters Rectifiers Voltage Motor drives Automotive engineering Hybrid electric vehicles Vehicle dynamics

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Dynamics and control of multi-converter DC power electronic systems

Dynamics and control of multi-converter DC power electronic ...

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： A. Emadi A. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Advanced Vehicle Systems Research Program Department of Electrical Engineering Texas A and M University College Station TX USA

In multi-converter power electronic systems, different power electronic converters are integrated together to form a complex and extensively interconnected system. In general, there are two kinds of loads in these systems. One group is conventional loads, which have positive incremental impedance characteristics. They are mainly considered as constant voltage loads that require regulated voltage for their operation. The other group is tightly regulated power electronic converters and motor drives sinking constant power from their input buses. The purpose of this paper is to present an assessment of the dynamic interactions between these loads in the multi-converter DC power electronic systems. Furthermore, a nonlinear robust stabilizing controller based on the feedback linearization technique for DC/DC PWM converters is presented.

关键词： Control systems Power electronics Voltage Interconnected systems Impedance Motor drives Robust control Linear feedback control systems Linearization techniques Pulse width modulation converters

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