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IEEE International Symposium on Circuits and systems (ISCAS)

作者： C.K.L. Tam G.W. Roberts Microelectronics and Computer Systems Laboratory Department of Electrical and Computer Engineering McGill University Montreal QUE Canada

A robust and highly scalable technique for measuring DC currents is described. The circuit consists largely of digital electronics except for a comparator and a passive RC filter. This simple structure is able to force a voltage at a circuit node while measuring the current that flows into it. The technique has been successfully demonstrated using a prototype constructed using a 0.35/spl mu/m CMOS chip.

关键词： Current measurement Circuit testing Voltage Pulse measurements Force measurement Pulse circuits Feedback circuits Application software Prototypes Integrated circuit testing

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An object-oriented design paradigm for standard CMOS fabrication technology

An object-oriented design paradigm for standard CMOS fabrica...

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International Conference on Microelectronics, ICM

作者： B. Hekmatshoar C. Lucas Thin Film Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran Control Systems Laboratory Department of Electrical and Computer Engineering University of Tehran Iran

The object-oriented design methodology has been manipulated to model the standard CMOS fabrication technology. Detecting and characterizing the objects and classes within the basic object-oriented features of encapsulation, inheritance and polymorphism, as well as discussing the model framework and model characterization has been the main pursuits of this works. This modeling approach puts forth the chance of a fully automated fabrication system, with well-characterized hardware and reusable software. This model is also a promising candidate for enhancing the system performance to the minimum level required for fully integrated agent-oriented entities, which can reconfigure themselves for future technology generations.

关键词： CMOS technology Fabrication Object oriented modeling Semiconductor device modeling Design methodology Object detection Encapsulation Hardware Software reusability System performance

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Positivistic Tendencies Due to engineering Education

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IFAC Proceedings Volumes 2003年第10期36卷 117-122页

作者： Mustafa Suphi Erden Department of Electrical and Electronics Engineering Computer Vision and Intelligent Systems Laboratory Middle East Technical University Ankara Turkey

In this research it is claimed that engineering education increases the positivistic tendencies of students regarding to the social problems. A theoretical background is given in the introduction and literature review. Two hypotheses are constructed and a micro-questionnaire survey is performed to test the hypotheses. In the survey positivistic tendencies of engineering students and social science students are compared. The results are depicted and discussed in detail. One of the hypotheses was approved by the results while the other was rejected. It is concluded that the rejected hypothesis was not in accordance with the claim since it overlooked some factors effecting positivism. The results of the survey support the claim by stating that ’engineering students are more positivist than social science students’.

关键词： Education engineering Education Social Science Education Positivism Ideology Questionnaire Survey

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A Framework for Adaptive Cluster Computing Using JavaSpaces

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Cluster Computing 2003年第3期6卷 201-213页

作者： Batheja, Jyoti Parashar, Manish The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers The State University of New Jersey Piscataway USA

Heterogeneous networked clusters are being increasingly used as platforms for resource-intensive parallel and distributed applications. The fundamental underlying idea is to provide large amounts of processing capacity over extended periods of time by harnessing the idle and available resources on the network in an opportunistic manner. In this paper we present the design, implementation and evaluation of a framework that uses JavaSpaces to support this type of opportunistic adaptive parallel/distributed computing over networked clusters in a non-intrusive manner. The framework targets applications exhibiting coarse grained parallelism and has three key features: (1) portability across heterogeneous platforms, (2) minimal configuration overheads for participating nodes, and (3) automated system state monitoring (using SNMP) to ensure non-intrusive behavior. Experimental results presented in this paper demonstrate that for applications that can be broken into coarse-grained, relatively independent tasks, the opportunistic adaptive parallel computing framework can provide performance gains. Furthermore, the results indicate that monitoring and reacting to the current system state minimizes the intrusiveness of the framework.

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A semidefinite programming approach to source localization

A semidefinite programming approach to source localization

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Asilomar Conference on Signals, systems & computers

作者： S. Venkatesh W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

A new algorithm based on semidefinite programming is presented for estimation of distributed source fields measured through a sensor array. The problem can be viewed as a subclass of inverse problems, which have been extensively investigated in the literature. Our approach is based on the so called information based complexity (IBC) paradigm, which formalizes the notion of seeking the set of all solutions that are consistent with the observed data. We formulate our problem as a question of estimating the source up to a prespecified resolution (average source field in a neighborhood) from the observed data with optimal accuracy. We show that this problem is convex and can be reformulated as a semidefinite program.

关键词： Array signal processing Spatial resolution Microphones Noise generators Phase noise Delay estimation Inverse problems Position measurement Frequency estimation Information systems

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Flexible information discovery in decentralized distributed systems 03

Flexible information discovery in decentralized distributed ...

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International Symposium on High Performance Distributed Computing

作者： C. Schmidt M. Parashar The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University USA

ISBN: (纸本)9780769519654

The ability to efficiently discover information using partial knowledge (for example keywords, attributes or ranges) is important in large, decentralized, resource sharing distributed environments such as computational grids and peer-to-peer (P2P) storage and retrieval systems. This paper presents a P2P information discovery system that supports flexible queries using partial keywords and wildcards, and range queries. It guarantees that all existing data elements that match a query are found with bounded costs in terms of number of messages and number of peers involved. The key innovation is a dimension reducing indexing scheme that effectively maps the multidimensional information space to physical peers. The design, implementation and experimental evaluation of the system are presented.

关键词： Peer to peer computing Grid computing Distributed computing Resource management Fault tolerant systems Central Processing Unit Costs Technological innovation Indexing Multidimensional systems

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Hidden feature models for speech recognition using dynamic Bayesian networks 8

Hidden feature models for speech recognition using dynamic B...

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Livescu, Karen Glass, James Bilmes, Jeff Spoken Language Systems Group MIT Laboratory for Computer Science CambridgeMA02139 United States University of Washington SSLI Lab. Department of Electrical Engineering SeattleWA98195 United States

In this paper, we investigate the use of dynamic Bayesian networks (DBNs) to explicitly represent models of hidden features, such as articulatory or other phonological features, for automatic speech recognition. In previous work using the idea of hidden features, the representation has typically been implicit, relying on a single hidden state to represent a combination of features. We present a class of DBN-based hidden feature models, and show that such a representation can be not only more expressive but also more parsimonious. We also describe a way of representing the acoustic observation model with fewer distributions using a product of models, each corresponding to a subset of the features. Finally, we describe our recent experiments using hidden feature models on the Aurora 2.0 corpus.

关键词： Speech recognition

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Earth return path impedances of underground cables for the multi-layer case: a finite element approach

Earth return path impedances of underground cables for the m...

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Power Tech Conference

作者： G.K. Papagiannis D.A. Tsiamitros G.T. Andreou D.P. Labridis P.S. Dokopoulos Power Systems Laboratory Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

The lossy earth return path influences significantly the electrical parameters of underground power cables, especially in cases where transient simulation models are of interest. The use of approximations for the calculation of earth correction terms proves to be inaccurate at high frequencies or low earth resistivities. The infinite integral terms representing the earth influence are high oscillatory in cases of underground cables and therefore difficult to integrate numerically. The scope of this paper is to present and compare results, obtained by a novel numerically stable and efficient integration scheme to those obtained by a finite element method formulation for several single core cable configurations and for homogeneous and multi-layered earth. Significant differences between impedances are recorded, especially for high frequencies and low earth resistivities.

关键词： Earth Impedance computer aided software engineering Finite element methods Conductors Underground power cables Power system transients EMTP Frequency Conductivity

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Adaptive double self-organizing map and its application in gene expression data

Adaptive double self-organizing map and its application in g...

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International Joint Conference on Neural Networks (IJCNN)

作者： H. Ressom D. Wang P. Natarajan Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Maine Orono ME USA

This paper presents a novel clustering technique known as adaptive double self-organizing map (ADSOM). ADSOM has a flexible topology and perform clustering and cluster visualization simultaneously, thereby requiring no a priori knowledge about the number of clusters. ADSOM combines features of the popular self-organizing map (SOM) with two-dimensional position vectors, which serve as a visualization tool to accurately determine the number of clusters present in the data. ADSOM updates its free parameters during training and it allows convergence of its position vectors to a fairly consistent number of clusters provided that its initial number of nodes is greater than the expected number of clusters. A novel index is introduced based on hierarchical clustering of the final locations of position vectors. The index allows automatic detection of the number of clusters, thereby reducing human error that could be incurred from counting cluster visually. The reliance of ADSOM in identifying the number of clusters is proven by applying it to publicly available yeast gene expression data.

关键词： Gene expression Data visualization Subspace constraints Clustering algorithms Application software Intelligent systems Laboratories Topology Convergence Humans

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Fuzzy logic-based gene regulatory network

Fuzzy logic-based gene regulatory network

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： H. Ressom D. Wang R.S. Varghese R. Reynolds Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Maine Orono ME USA

DNA microarray technology enables a parallel analysis of the expression of genes in an organism. The wealth of spatio-temporal data generated by this technology allows researchers to potentially reverse engineer the genetic network. Fuzzy logic has been proposed as a method to analyze the relationships between genes. This method can identify interacting genes that fit a known fuzzy model of gene interaction by testing all combinations of gene expression profiles. However, this approach is slow and computationally complex. This paper introduces improvements made in terms of reducing computation time and generalizing the gene regulatory model to accommodate co-activators and co-repressors. Improvement in computation time is achieved by using clustering as a pre-processing method, thereby reducing the total number of gene combinations analyzed. This will allow the algorithm to run in a shorter amount of time with minimal effect on the results. The proposed technique will pave the way towards the creation of a generalized gene interaction model that can accommodate any combination of genes.

关键词： Fuzzy logic Clustering algorithms DNA Reverse engineering Genetics Gene expression Differential equations Intelligent systems Laboratories Organisms

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