This paper presents an e cient and reliable tabu search (TS)–based approach to solve the optimal power ow (OPF) problem. The proposed approach employs TS algorithm for optimal settings of the control variables of the OPF problem. Incorporation of TS as a derivative-free optimization technique in solving OPF problem signiŽcantly reduces the computational burden. One of the main advantages of T...

Picture Coding Symposium, pp. 33-38, Berlin, September 1997. In this paper we present an algorithm for the estimation of 3D motion and the analysis of facial expressions of a speaking person. To constrain the exible body motion, a 3D model of the person is used specifying shape, texture and facial motions. The surface of the model is built with triangular Bsplines leading to a small number of c...

We describe the design principles and functionality of a visual query language called SeeQL that represents data retrieval and analysis operations as a data-ow graph. A query is viewed as a sequence of re-lational algebra and other data transformation operations applied to database tables. The language is well-suited for large-scale scientiic database applications, where data analysis is a majo...

Mobile code systems are technologies that allow applications to move their code, and possibly the corresponding state, among the nodes of a wide-area network. Code mobility is a exible and powerful mechanism that can be exploited to build distributed applications in an Internet scale. At the same time, the ability to move code to and from remote hosts introduces serious security issues. These i...

We introduce the ActivityFlow speciication language for in-cremental speciication and exible coordination of workkow activities. The most interesting features of the ActivityFlow speciication language include (1) a collection of speciication mechanisms, which provides a workkow designer with a uniform workkow speciication interface to describe diierent types (i.e., ad-hoc, administrative, or pr...

The simultaneous evolution of personal computing tools and networks has focused attention on the notion of harnessing computer technology to assist in human collaboration on group work. While personal productivity tool technology and use have reached a high level of sophistication, the most basic ideas for how computer technology should assist in collaboration across the network have not yet co...

In this paper, we investigate the problem of providing worst-case end-to-end delay guarantee to a leaky-bucket constrained ow traversing a series of N packet schedulers. We consider a network of routers that support the Guaranteed (G) Service class of the IETF Integrated Services (IntServ) Working Group; this service class is proposed to provide Quality of Service (QoS) in the Internet. Under t...

The computational method of constrained constructive optimization (CCO) has been generalized in two important respects: (1) arterial model trees are now grown within a convex, three-dimensional piece of tissue and (2) terminal ̄ow variability has been incorporated into the model to account for the heterogeneity of blood ̄ow observed in real vascular beds. Although no direct information from top...

The next generation of scalable parallel systems e g machines by KSR Convex and others will have shared memory supported in hardware unlike most current generation machines e g o erings by Intel nCube and Thinking Machines However current shared memory architectures are constrained by the fact that their cache controllers are hardwired and in exible which limits the range of programs that can a...

ADV # 20 AN 05 E CES IN ECOLOGICAL RESEARCH VOL. 37 0065-250 lsevier Ltd. All rights reserved DOI: 10.1016/S0065-2504( 4/0 04) II. I ntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 III. P redator and Prey in the Chemostat—A Simple Story? . . . . . . . . . . . . 224 IV. T esting Hypotheses of Mechanism . . . . . . . . . . . . . . . . . . ...