检索结果-内蒙古大学图书馆

2004 ASME International Mechanical engineering Congress and Exposition, IMECE

作者： Kowalski, Gregory J. Zenouzi, Mansour Department of Mechanical and Industrial Engineering Northeastern University Boston MA 02115 United States Department of Electronics and Mechanical Electromechanical Engineering Program Wentworth Institute of Technology Boston MA 02115 United States

A generalized thermodynamic model is developed to describe cooling, heating and power generating systems. This model is based on reversible power generation and refrigeration devices with practical, irreversible heat exchanger processes provides valuable information on a system's performance and allows easy comparisons among different systems at different loading conditions. Using both the first and second laws as well as the carbon dioxide production rate allows one to make a first order system assessment on its energy usage and environment impact. The use of the exergy destruction rate and insuring that its behavior be consistent with that of the first law performance is a important to insure that the thermodynamic system boundaries are correctly and completely defined. The importance of the total thermal load to required power ratio (HLRP) as a scaling parameter is demonstrated. While the reported results confirmed that generalized trends are not possible identify, a number of trends for limited conditions have been identified. The results have shown that a combined vapor compression /absorption refrigeration has higher first law utilization factors and lower carbon dioxide production rate for system with higher refrigeration to total thermal load ratios for all HLRP values. Fuel cell based subsystems outperform engine based subsystems for systems with large refrigeration loads. Copyright © 2004 by ASME.

关键词： Cogeneration plants

来源：评论

学校读者我要写书评

暂无评论

A new method on assigning function types to line segments for function approximation-based image coding

A new method on assigning function types to line segments fo...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： F. Kawazoe K. Toraichi P.W.H. Kwan Donoral Program Graduate School of Systems and lnformation Engineering University of Tsukuba Japan Institute of Information Science and Electronics University of Tsukuba Japan Core Research for Evolutional Science & Technology Program Japan Science and Technology Corporation Japan

This paper proposes a new method to determine the types of function for approximating line segments using an algorithm based on binary search. In the function approximation-based image coding, it is essential that the joint points between different types of line segment be extracted precisely. Through experiments, it is verified that the proposed method extracts straight lines and arcs more precisely than the earlier method.

关键词： Image segmentation Function approximation Image coding Paper technology Flowcharts Systems engineering and theory Information science Electronic mail Pixel Target tracking

来源：评论

学校读者我要写书评

暂无评论

A method on tracking common boundaries of color regions in function approximation-based image coding

A method on tracking common boundaries of color regions in f...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： T. Sugiyama P.W.H. Kwan K. Toraichi K. Katagishi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Japan Core Research for Evolutional Science & Technology Program Japan Science and Technology Corporation Japan Institute of Information Sciences and Electronics University of Tsukuba Japan

A boundary tracking method crucial to function approximation-based image coding is proposed that solves the problems caused by duplicate tracking the common boundaries of color regions when methods conventionally applied to bilevel raster images are inappropriately used. Experimental evaluation is performed to verify its effectiveness.

关键词： Function approximation Image coding Colored noise Color Image reconstruction Systems engineering and theory Electronic mail Performance evaluation Spline Internet

来源：评论

学校读者我要写书评

暂无评论

Performance analysis of serial concatenated space-time code in OFDM over frequency selective channels

Performance analysis of serial concatenated space-time code ...

引用

IEEE Conference on Vehicular technology (VTC)

作者： P. Patcharamaneepakorn R.M.A.P. Rajatheva A. Ahmed Telecommun. Network Asian Inst. of Technol. Pathumthani Thailand Department of Electronics & Telecommunications Engineering University of Moratuwa Moratuwa Sri Lanka Telecommunications Program Asian Institute of Technology Pathumthani Thailand

In this paper, the performance of serial concatenated space-time code (SCSTC) in an OFDM system has been investigated over frequency-selective fading channel. Time variation of the channel leads to interchannel interference (ICI), which degrades the bit error rate (BER) performance of the system. The degradation depends on the maximum Doppler shift and flat fading channel, the performance with OFDM over frequency selective fading channel partly depends on the channel delay profile. It can be seen that the highest possible diversity gain is the product of the number of transmit antennas and the number of delay diversity order. Finally, simulation results have been evaluated for quasi-static frequency-selective fading channel.

关键词： Performance analysis Concatenated codes Space time codes OFDM Frequency-selective fading channels Degradation Bit error rate Delay Interchannel interference Doppler shift

来源：评论

学校读者我要写书评

暂无评论

Binaural sensitivity as a function of interaural electrode position with a bilateral cochlear implant user

Binaural sensitivity as a function of interaural electrode p...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

Linking simulation tools to laboratory experiments: Teaching...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Suppression of boron penetration by hot wire CVD polysilicon

Suppression of boron penetration by hot wire CVD polysilicon

引用

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

来源：评论

学校读者我要写书评

暂无评论

Paradigms and scope of engineering technology education

Paradigms and scope of engineering technology education

引用

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

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：