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Working Conference on Reverse engineering

作者： G. Antoniol G. Canfora A. De Lucia E. Merlo University of Sannio Benevento Italy Department Electrical and Computer Engineering Ecole Polytechnique C. P. 6079 Succ. Centre Ville Montreal QUE Canada

ISBN: (纸本)0769503039

software system documentation is almost always expressed informally, in natural language and free text. Examples include requirement specifications, design documents, user manual pages, system development journals, error logs and related maintenance reports. We propose an approach to establish and maintain traceability links between the source code and free-text documents. A premise of our work is that programmers use meaningful names for program's items, such as functions, variables, types, classes and methods. We believe that the application domain knowledge that programmers process when writing the code is often captured by the mnemonics for identifiers; therefore, the analysis of these mnemonics can help to associate high-level concepts with program concepts, and vice versa. In this paper, the approach is applied to software written in an object-oriented (OO) language, namely C++, to trace classes to manual sections.

关键词： Documentation Programming profession Context modeling software maintenance Writing Natural languages Mathematics software systems Cognition computer industry

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A homodyne multiport network analyzer forS-parameter measurements of microwaveN-port circuits/systems

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Microwave and Optical Technology Letters 1999年第1期24卷

作者： N. Boulejfen A. B. Kouki F. M. Ghannouchi Department of Electrical and Computer Engineering Ecole Polytechnique Montreal Montreal P.Q. H3C 3A7 Canada Department of Electrical and Computer Engineering Ecole de Technologies Superieur Montreal P.Q. Canada

A homodyne multiport network analyzer is proposed for the characterization of N -port microwave devices, circuits, and systems. The single six-port junction used as a wave correlator is operated as a two-channel wave receiver. The use of an additional test set, which comprises two switching matrices and N bidirectional couplers, allows the measurements of complete S -parameter matrices of N -port devices. By comparison to existing network analyzers, the proposed system is homodyne in the sense that it does not require any frequency down-conversion to determine the phase information, and uses only one single six-port junction to obtain complex S -parameter measurements from only scalar measurements. A detailed description of the proposed system is presented. Two- and three-port structures are measured, and the results are compared to the data obtained by a two-port commercial network analyzer. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 63–67, 2000.

关键词： microwave network analyzer S-parameter homodyne six-port coupler reflection transmission calibration de-embedding

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ART: an architectural reverse engineering environment

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Journal of software: Evolution and Process 1999年第5期11卷

作者： Roberto Fiutem Giulio Antoniol Paolo Tonella Ettore Merlo ITC-IRST Istituto per la Ricerca Scientifica e Tecnologica I-38050 Povo (Trento) Italy Department of Electrical and Computer Engineering Ecole Polytechnique C.P. 6079 Succ. Centre Ville Montreal Quebec Canada

When programmers perform maintenance tasks, program understanding is often required. One of the first activities in understanding a software system is identifying its subsystems and their relations, i.e., its software architecture. Since a large part of the effort is spent in creating a mental model of the system under study, tools can help maintainers in managing the evolution of legacy systems by showing them architectural information. This paper describes an environment for the architectural recovery of software systems called the architectural recovery tool (ART). The environment is based on a hierarchical architectural model that drives the application of a set of recognizers, each producing a different architectural view of a system or of some of its parts. Recognizers embody knowledge about architectural clichés and use flow analysis techniques to make their output more accurate. To test the accuracy and effectiveness of the ART, a suite of public domain applications containing interesting architectural organizations was selected as a benchmark. Results are presented by showing ART performance in terms of precision and recall of the architectural concept retrieval process. The results obtained show that cliché-based architectural recovery is feasible and the recovered information can be valuable support in reengineering and maintenance activities. Copyright © 1999 John Wiley & Sons, Ltd.

关键词： reverse architecturing program understanding cliché matching flow analysis

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Method of lines based on finite element technique to analyse electromagnetic problems

Method of lines based on finite element technique to analyse...

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1998 IEEE Antennas and Propagation Society International Symposium, APSURSI 1998

作者： Rushan, Chen Yung, Edward K.N. Ke, Wu Daoxiang, Wang Department of Electrical Engineering City University of Hong Kong Hong Kong Hong Kong Department of Electrical and Computer Engineering Ecole Polytechnique of Montreal Montreal Canada

ISBN: (纸本)0780344782

In this paper, the novel FEMOL (finite element-method of lines) technique to solve electromagnetic problems is introduced and the basic concept and theory is described in detail through the Poisson equation. Some numerical results are given to demonstrate the efficiency and accuracy of this method. From the discussion given, it can be seen that the FEMOL appears to have a strong resemblance to the finite element method and method of lines but has the advantages of both methods. This method is being extended to analyse time-varying and three dimension electromagnetic field boundary value problems. © 1998 IEEE.

关键词： Poisson equation

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New nerve cuff electrode based on a shape memory alloy armature

New nerve cuff electrode based on a shape memory alloy armat...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M.-A. Crampon M. Sawan V. Brailovski F. Trochu Department of Electrical & Computer Engineering Ecole polytechnique de Montreal Montreal QUE Canada Department of Mechanical Engineering Ecole polytechnique de Montreal Montreal QUE Canada

The authors present a new nerve cuff electrode based on a shape memory alloy (SMA) armature. This device is dedicated to functional electrical stimulation of the bladder in spinal cord injured patients. The SMA armature performs the closing of the electrode, making its instillation around the nerve much easier, quicker and safer. Both remarkable mechanical properties of SMA materials namely shape memory effect and superelasticity, can be used to obtain the desired actuation of the electrode closing. The manufacturing procedure of this new electrode is described. It does not require any expensive or complex techniques. Bipolar and tripolar electrodes have been manufactured with an inner diameter of 1.6 mm and a cuff wall thickness of 0.8 mm. Acute studies in dogs are being carried out to validate the device and the implantation procedure. In order to test the electrical functionality of the electrode, a fully programmable biphasic stimuli generator has been designed and implemented using FPDs (Field Programmable Devices).

关键词： Shape memory alloys Biomedical electrodes Rubber Engine cylinders Manufacturing Contacts Platinum Bladder Mechanical factors Spirals

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A homodyne multi-port network analyzer for S parameter measurements of microwave N-port circuits/systems

A homodyne multi-port network analyzer for S parameter measu...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： N. Boulejfen A.B. Kouki S. Khouaja F.M. Ghannouchi Department of Electrical and Computer Engineering Ecole Polytechnique Montreal Montreal QUE Canada

In this paper a homodyne multi-port network analyzer using a single six-port junction as a wave correlator is proposed for the characterization of N-port microwave devices, circuits and systems. The six-port wave correlator is operated as a two-channel wave receiver. The use of an additional test set, which comprises two switching matrices and N directional couplers, allows the measurements of complete S parameter matrices of N-port devices. By comparison to existing network analyzers, the proposed system is homodyne in the sense that it does not require any frequency down conversion to determine the phase information and uses only one six-port junction to obtain complex S parameter measurements from only scalar measurements.

关键词： Scattering parameters Correlators Frequency measurement Phase measurement Microwave devices Circuits and systems Circuit testing Directional couplers Information analysis Frequency conversion

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Fully Digital Adaptive Control of a Feed-Forward Amplifier Implemented with Digital Signal Processor

Fully Digital Adaptive Control of a Feed-Forward Amplifier I...

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European Conference on Microwave

作者： S. Goasguen G. Zhao F.M. Ghannouchi Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal Canada

A complete digital adaptive control is introduced for the mulling and the error loop of a 1.96 GHz feed-forward linearization system. The nulling loop is controlled with a well known power gradient method and the error loop is controlled with a frequency domain cancellation method using a Digital Signal Processor (DSP). To our knowledge it is the First time that experimentals results show 20 dB improvement on the inter-modulations product regardless of the input power level

关键词： Adaptive control Feedforward systems Digital signal processors Digital signal processing Error correction Voltage control Phase modulation Frequency domain analysis Power amplifiers Gradient methods

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Design of clock distribution networks in presence of process variations

Design of clock distribution networks in presence of process...

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Great Lakes Symposium on VLSI

作者： M. Nekili Y. Savaria G. Bois Department of Electrical & Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada

Tolerance to process-induced skew remains one of the major concerns in the design of large-area and highspeed clock distribution networks. Indeed, despite the availability of some efficient exact-zero skew algorithms that can be applied during circuit design, the clock skew remains an important performance limiting factor after chip manufacturing, and is of increasing concern for sub-micron technologies. This tutorial reviews the importance of the problem, its sources, as well as typical examples of existing solutions. Solutions range from design rule strategies to built-in self-compensation methods.

关键词： Clocks Availability Circuit synthesis Manufacturing

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A BiCMOS wide-lock range fully integrated PLL 10

A BiCMOS wide-lock range fully integrated PLL

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10th International Conference on Microelectronics, ICM 1998

作者： Fouzar, Y. Sawan, M. Savaria, Y. Ecole Polytechnique de Montrkal Department of Electrical and Computer Engineering P.O.Box 6079 Station Centreville MontrealQCH3C 3A7 Canada

ISBN: (纸本)0780349695

A fully integrated Phase Locked Loop (PLL) with wide lock range is presented in this paper. The designed structure of the PLL is based on the charge-pump type with a differential architecture Voltage Controlled Oscillator (VCO) building block. In the proposed VCO, current mirrors are used as the active load of the source-followers which allow a high stability of VCO oscillation within a wide control range. The PLL has been implemented in 0.8 μm BiCMOS technology without the need of any external components. It operates with a lock range of 14 to 420 MHz. The lock time is 15 μS. The resulting layout area and the power dissipation of the whole PLL are 0.65 mm2 and 18 mW respectively. © 1998 IEEE.

关键词： Phase locked loops

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Method of lines based on finite element technique to analyse electromagnetic problems

Method of lines based on finite element technique to analyse...

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Antennas and Propagation Society International Symposium

作者： Chen RuShan E.K.N. Yung Wu Ke Wang DaoXiang Department of Electrical Engineering City University of Hong Kong Hong Kong China Department of Electrical and Computer Engineering Ecole Polytechnique Montreal Montreal Canada

关键词： Finite element methods Electromagnetic analysis Shape Polynomials Lagrangian functions Equations Boundary value problems Physics Solid modeling Electromagnetic modeling

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