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Computer Engineering Commons™

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2003

Selected Works

Articles 1 - 9 of 9

Full-Text Articles in Computer Engineering

Facilitating Conversations Among Web Services As Speech-Act Based Discourses, Karthikeyan Umapathy, Sandeep Purao, Vijayan Sugumaran Dec 2003

Facilitating Conversations Among Web Services As Speech-Act Based Discourses, Karthikeyan Umapathy, Sandeep Purao, Vijayan Sugumaran

Karthikeyan Umapathy

Web services composition is an emerging paradigm for enabling application deployment and integration within and across organizational boundaries. A landscape of languages and techniques for web services composition has emerged and is continuously being enriched. The ability to support conversations taking place between Web Services is an important area that is not yet fully addressed by the emerging standards. We suggest an approach to derive speech-act based message structures for conversation support that can complement existing standards.

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Combined Beamforming And Space-Time Block Coding With A Sparse Array Antenna, Robert H. Morelos-Zaragoza, Mohammad Ghavami Oct 2003

Combined Beamforming And Space-Time Block Coding With A Sparse Array Antenna, Robert H. Morelos-Zaragoza, Mohammad Ghavami

Robert Henry Morelos-Zaragoza

In this paper, we continue our investigation of joint beamforming and transmit diversity with space-time block coding. In particular, the performance of a four-element array antenna is considered, in the context of an indoor wireless communication system. The main contribution is to show that transmit diversity may be practically achieved, even with correlated beams produced by a sparse array antenna.

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Combined Beamforming And Space-Time Block Coding With Sparse Array Antennas, Robert H. Morelos-Zaragoza Oct 2003

Combined Beamforming And Space-Time Block Coding With Sparse Array Antennas, Robert H. Morelos-Zaragoza

Robert Henry Morelos-Zaragoza

In this paper, the combination of beamforming and space-time block coding is investigated. An adaptive scheme for the assignment of transmission beams is proposed. Data for the determination of beams are obtained using a triangular switch-beam array antenna at the transmitter. The number of peak points is determined from the data and a prescribed threshold level. Orthogonal space-time block coding is then applied to the transmission beams. We examine the distribution of the number of assigned beams as a function of indoor wireless channel parameters. Also, the effects of a small number of array elements and associated correlated beams, and …

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Optical And Acoustic Habitat Characterization With The Seabed Auv, Hanumant Singh, Ryan Eustice, Oscar Pizarro, Christopher Roman Aug 2003

Optical And Acoustic Habitat Characterization With The Seabed Auv, Hanumant Singh, Ryan Eustice, Oscar Pizarro, Christopher Roman

Christopher N. Roman

The Seabed AUV is an Autonomous Underwater Vehicle (AUV) built to serve as a readily available and operationally simple tool for high resolution imaging. It is a hover-capable vehicle that performs optical sensing with a 12 bit 1280/spl times/1024 CCD camera and acoustic high resolution mapping using an MST 300 kHz sidescan and a 675 kHz pencil beam bathymetric sonar. The AUV has been designed for operations from small vessels with minimal support equipment. It has an operational depth of 2000 meters and at 1 m/s can run for up to 10 hours. In this paper we report on the …

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Wind Gusts, Christopher Roman May 2003

Wind Gusts, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).

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Waves And Current, Christopher Roman Mar 2003

Waves And Current, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).

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Web Mining For Web Personalization, Magdalini Eirinaki, Michalis Vazirgiannis Feb 2003

Web Mining For Web Personalization, Magdalini Eirinaki, Michalis Vazirgiannis

Magdalini Eirinaki

Web personalization is the process of customizing a Web site to the needs of specific users, taking advantage of the knowledge acquired from the analysis of the user's navigational behavior (usage data) in correlation with other information collected in the Web context, namely, structure, content, and user profile data. Due to the explosive growth of the Web, the domain of Web personalization has gained great momentum both in the research and commercial areas. In this article we present a survey of the use of Web mining for Web personalization. More specifically, we introduce the modules that comprise a Web personalization …

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The Mysterious Marine Layer, Christopher Roman Jan 2003

The Mysterious Marine Layer, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).

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Manufacturing Interoperability, Steven Ray, Al Jones Dec 2002

Manufacturing Interoperability, Steven Ray, Al Jones

Steven R Ray

As manufacturing and commerce become ever more global in nature, companies are increasingly dependent upon the efficient and effective exchange of information with their partners, wherever they may be. Leading manufacturers rely upon computers to perform this information exchange, which must therefore be encoded for electronic transmission. Because no single company can dictate that all its partners use the same software, standards for how the information is represented become critical for cost-effective, errorfree transmission of data. This paper discusses some interoperability issues related to current standards, and describes two projects underway at the National Institute of Standards and Technology in …

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