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检索条件"机构=Sch. of Elec. Engineering and Computer Science"

共 863 条记录，以下是571-580 订阅

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Incorporating complex statistical information in active contour-based image segmentation

Incorporating complex statistical information in active cont...

引用

Proceedings: 2003 International Conference on Image Processing, ICIP-2003

作者： Kim, Junmo Fisher III, John W. Cetin, Mujdat Yezzi Jr., Anthony Willsky, Alan S. Lab. for Info. and Decision Systems Massachusetts Inst. of Technology 77 Massachusetts Ave. Cambridge MA 02139 United States Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States

We propose an information-theoretic method for multi-phase image segmentation, in an active contour-based framework. Our approach is based on nonparametric density estimates, and is able to solve problems involving arbitrary probability densities for the region intensities. This is achieved by maximizing the mutual information between the region labels and the image pixel intensities, in order to segment up to 2m regions using m curves. The method does not require any prior training regarding the regions of interest, but rather learns the probability densities during the evolution process. We present some illustrative experimental results, demonstrating the power of the proposed segmentation approach.

关键词： Image segmentation

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Investigating the Role of Glottal Features in Classifying Clinical Depression

Investigating the Role of Glottal Features in Classifying Cl...

引用

A New Beginning for Human Health: Proceedings of the 25th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS 2003

作者： Moore II, Elliot Clements, Mark Peifer, John Weisser, Lydia Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA United States Interactive Media Technology Center Georgia Institute of Technology Atlanta GA United States Department of Psychiatry Medical College of Georgia Augusta GA United States

Classifying emotion and emotion related disorders in the voice have often been studied utilizing prosodie (pitch, energy, speaking rate) and other spectral characteristics (formants, power spectral density) of the acoustic speech signal. Glottal waveform features have received little attention in the study of many emotion and emotion related disorders, but have shown strong correlations in a variety of speech pattern studies including speaker characterization and stress analysis. We employ glottal extraction techniques to obtain features related to timing, ratios, shimmer, and spectral characteristics of the glottal waveform in the study of clinical depression. Our study reports on several glottal waveform features that show very good separation among a control group and patient group of males and females suffering from a depressive disorder.

关键词： Speech synthesis

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THz sectroscopy and imaging: Application to the eergetic mterials PBX 9501 and PBX 9502

THz sectroscopy and imaging: Application to the eergetic mte...

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Conference on Lasers and elec.ro-Optics (CLEO);Postconference Digest

作者： Funk, David J. Calgaro, F. Averitt, R.D. Asaki, M.L.T. Taylor, A.J. Cheville, R.A. Materials Science Divisions MS K764 Los Alamos National Laborator Los Alamos NM 87545 United States Sch. of Elec. and Comp. Engineering Oklahoma State University Stillwater OK 74078 United States

We describe the measurement of the complex index of refraction near one THz for the plastic bonded explosives PBX 9501 and PBX 9502 as well as a rapid-scanning two-dimensional imaging technique for the detection of de... 详细信息

关键词： Imaging techniques

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Time-dependent characteristics of titanium-silicide contacts to 6H-silicon carbide

Time-dependent characteristics of titanium-silicide contacts...

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作者： Capano, M.A. Patterson, J.K. Petry, L. Solomon, J.S. Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907 United States Hewlett-Packard Corvalis OR United States Air Force Research Laboratory Materials Directorate Univ. of Dayton Research Institute Dayton OH 45433 United States

The processing conditions necessary to achieve low resistivity of the C54-TiSi2 phase in contact with 6H-SiC are explored. This study demonstrates that an interlayer of Si between a Ti layer and the 6H-SiC substrate suppresses the formation of TiC, and that a metallization consisting of either Ti-rich or Si-rich silicide phases may be chosen. When the Ti-to-Si layer thickness ratio is 1:3, the C54-TiSi2 and TiSi phases are observed following a 600°C/30 min and an 850°C/30 min annealing cycle. When the Ti-to-Si layer thickness ratio is 1:1, Ti5Si3 and TiSi phases are observed following the same annealing cycle. Time-dependent, in-situ resistance measurements are rationalized in terms of these microstructural developments. The Ti5Si3/TiSi structure is demonstrated to have a resistivity of 239 μΩ·cm, whereas the TiSi2/TiSi structure has a resistivity of only 23 μΩ·cm. Explanations for different microstructures observed are presented.

关键词： Silicon carbide

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Phoneme recognition using temporal patterns

Phoneme recognition using temporal patterns

引用

6th International Conference, TSD 2003

作者： Matějka, Pavel sch.arz, Petr Hermansky, Hynek Černocky, Jan VUT Brno Fac. of Elec. Eng. and Communication OSHU Portland OR United States VUT Brno Fac. of Inf. Technology OSHU Portland OR United States OGI Sch. of Science and Engineering OHSU Portland OR United States

We investigate and compare several techniques for automatic recognition of unconstrained context-independent phoneme strings from TIMIT and NTIMIT databases. Among the compared techniques, the technique based on TempoRAl Patterns (TRAP) achieves the best results in the clean speech, it achieves about 10% relative improovements against baseline system. Its advantage is also observed in the presence of mismatch between training and testing conditions. Issues such as the optimal length of temporal patterns in the TRAP technique and the effectiveness of mean and variance normalization of the patterns and the multi-band input the TRAP estimations, are also explored.

关键词： Speech recognition

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Connectivity planning and call admission control in an on-board cross-connect based multimedia GEO satellite network

Connectivity planning and call admission control in an on-bo...

引用

2003 International Conference on Communications (ICC 2003)

作者： Hu, Rose Q. Babbitt, J. Abu-Amara, H. Rosenberg, C. Lazarou, G. Department of Electrical Engineering Mississippi State University Mississippi State MS 39762-9571 United States Telecom. Engineering Department University of Texas at Dallas Richardson TX 75083-0688 United States Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907-1285 United States

This paper addresses end-to-end connectivity planning and call admission control for a high capacity multi-beam satellite network with on-board cross-connectivity. Onboard satellite switching is a technology designed to offer multi-media services, especially in demographically dispersed areas. Nevertheless, full on-board switching techniques are far from maturity. Their implementations have been proven expensive and difficult. There are also high risks involved in launching satellites for the stationary orbit surrounding the earth. As a substitute, a satellite network with on-board cross-connect is devised in this paper. Connectivity planning and call admission control mechanisms associated with such a network are also presented. Simulation studies are conducted to show the effectiveness of the proposed mechanisms.

关键词： Satellite communication systems

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Investigations of STGS, SNGS, CTGS, & CNGS materials for use in SAW applications

Investigations of STGS, SNGS, CTGS, & CNGS materials for use...

引用

Proceedings of the 2003 IEEE International Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum

作者： Puccio, D. Malocha, D.C. Chou, Mitch M.C. Ctr. Appl. Acoustoelectron. Technol. Sch. of Elec. Eng./Computer Science University of Central Florida Orlando FL 32816-2450 United States Crystal Photonics Inc. 5525 Benchmark Lane Sanford FL 32773

Langasite structure compounds have been the focus of much consideration recently, given their higher elec.romechanical coupling and similar temperature behavior to that of quartz. Recent investigations have begun on four new materials, STGS, SNGS, CTGS, and CNGS. These langasite structure crystals show great promise for use in SAW applications. In some respects, STGS, SNGS, CTGS, and CNGS exhibit better SAW material properties than the LGX materials (langasite, langanite, and langatate) previously studied. For example, SNGS and STGS have higher elec.romechanical coupling than LGX, in excess of 0.6% and 0.5%, respectively. In addition, all four materials have lower densities resulting in higher phase velocities. Along with previously studied trigonal 32 class materials, there is a good possibility that temperature compensated cuts exist. Recent results are reported for SAW material parameters and device performance at various propagation directions on Y-cut STGS, SNGS, CTGS, and CNGS wafers. These results include coupling coefficient, phase velocity, transducer capacitance, and temperature coefficient of delay (TCD). Experimental measurements of metal strip reflectivity are shown for various metal thicknesses. Measured SAW resonator Q data are also presented. The measurement procedures and the parameter extraction methods for these experiments are discussed. A comparison of the data with previously reported parameters on LGX is presented and a discussion of the results is provided.

关键词： Acoustic surface wave devices

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Bearing Fault Detection via Autoregressive Stator Current Modeling

Bearing Fault Detection via Autoregressive Stator Current Mo...

引用

2003 IEEE Industry Applications Conference;38th IAS Annual Meeting: Crossroads To Innovation

作者： Stack, Jason R. Habetler, Thomas G. Harley, Ronald G. United States Navy Coastal System Station 6703 West Hwy. 98 Panama City FL 32407 United States Georgia Institute of Technology Sch. of Elec./Computer Engineering 777 Atlantic Ave. Atlanta GA 30332 United States

This research proposes a method for detecting developing bearing faults via stator current. Current-based condition monitoring offers significant economic savings and implementation advantages over vibration-based techniques. This method begins by filtering the stator current to remove most of the significant frequency content unrelated to bearing faults. Afterwards, the filtered stator current is used to train an autoregressive signal model. This model is first trained while the bearings are healthy, and a baseline spectrum is computed. As bearing health degrades, the modeled spectrum deviates from its baseline value;the mean spectral deviation is then used as the fault index. This fault index is able to track changes in machine vibration due to developing bearing faults. Due to the initial filtering process, this method is robust to many influences including variations in supply voltage, cyclical load torque variations, and other (non-bearing) fault sources. Experimental results from 10 different bearings are used to verify the proficiency of this method.

关键词： Stators

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ARC: An Integrated Admission and Rate Control Framework for CDMA Data Networks Based on Non-Cooperative Games

ARC: An Integrated Admission and Rate Control Framework for ...

引用

Proceedings of the Ninth Annual International Conference on Mobile Computing and Networking, MobiCom 2003

作者： Lin, Haitao Chatterjee, Mainak Das, Sajal K. Basu, Kalyan Ctr. Res. Wireless Mobility/N. Dept. of Comp. Sci. and Engineering University of Texas at Arlington Arlington TX 76019-0015 United States Sch. of Elec. Eng./Computer Science University of Central Florida Orlando FL 32816-2450 United States

ISBN: (纸本)9781581137538

The competition among wireless data service providers brings in an option for the customers to switch their providers, due to unsatisfactory service or otherwise. However, the existing resource management algorithms for wireless networks fail to fully capture the far-reaching impact of this competitiveness. From this perspective, we propose an integrated admission and rate control (ARC) framework for CDMA based wireless data networks. The admission control is at the session (macro) level while the rate control is at the link layer packet (micro) level. The ARC framework is based on a novel game theoretic formulation which defines non-cooperative games between the service providers and the customers. A user's decision to leave or join a provider is based on a finite set of strategies. A service provider can also construct its game strategy set so as to maximize the utility (revenue) yet attaining its target churn rate (the probability of users leaving the network). We show that the pure strategy Nash equilibrium can be established for both under-loaded and fully-loaded systems such that the providers have clearly defined admission criteria as outcome from this game. Users are categorized into multiple classes and offered differentiated services based on the price they pay and the service degradation they can tolerate. We show that the proposed ARC framework significantly increases the provider's revenue and also successfully offers differentiated QoS to the users.

关键词： computer networks

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Influence of 4H-SiC semi-insulating substrate purity on SiC metal-semiconductor field-effect transistor performance

Influence of 4H-SiC semi-insulating substrate purity on SiC ...

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作者： Zhang, A.P. Rowland, L.B. Kaminsky, E.B. Tucker, J.B. Beaupre, R.A. Kretchmer, J.W. Garrett, J.L. Vertiatchikh, A. Koley, G. Cha, H.Y. Allen, A.F. Cook, J. Foppes, J. Edward, B.J. Gen. Electric Global Research Center Niskayuna NY 12309 United States Sch. of Elec./Computer Engineering Cornell University Ithaca NY 14853 United States Lockheed Martin NE/SS-Radar Systems Syracuse NY 13221 United States

The performances of silicon carbide (SiC) metal-semiconductor field-effect transistors (MESFETs) fabricated on conventional V-doped semi-insulating substrates and new V-free semi-insulating substrates have been compared. The V-free 4H-SiC substrates were confirmed by secondary ion mass spectrometry (SIMS). X-ray topography revealed significantly fewer micropipes and low-angle boundaries in V-free semi-insulating substrates than in conventional V-compensated substrates. Deep-level transient spectroscopy (DLTS) indicated that the spectra signals observed in conventional V-doped substrates were either reduced or disappeared in V-free substrates. The intrinsic deep levels in V-free substrates to make semi-insulating properties were also observed in DLTS spectra. Under various DC and RF stresses, SiC MESFETs fabricated on new V-free semi-insulating substrates showed superior device performance and stability.

关键词： Silicon carbide

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