Single machine scheduling problem with controllable processing times and resource dependent release times [An article from: European Journal of Operational Research]

Format : HTML Author : B.C. Choi Publisher : Elsevier List Price : $7.95 Amazon Price : $7.95

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This digital document is a journal article from European Journal of Operational Research, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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We consider two single machine scheduling problems with resource dependent release times and processing times, in which the release times and processing times are linearly decreasing functions of the amount of resources consumed. The objective is to minimize the total cost of makespan and resource consumption function that is composed of release time reduction and processing time reduction. In the first problem, the cost of reducing a unit release time for each job is common. We show that the problem can be solved in polynomial time. The second problem assumes different reduction costs of job release times. We show that the problem can be reduced polynomially from the partition problem and thus, is NP-complete.
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ARAB EUROPEAN RELATIONS - June 18 - EU To Release Aid To PA.(Palestine): An article from: APS Diplomat Recorder

Format : HTML Author : Gale Reference Team Release Date : 2007-07-21 Publisher : Thomson Gale List Price : $9.95 Amazon Price : $9.95

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This digital document is an article from APS Diplomat Recorder, published by Thomson Gale on June 16, 2007. The length of the article is 1000 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: ARAB EUROPEAN RELATIONS - June 18 - EU To Release Aid To PA.(Palestine)
Author: Gale Reference Team
Publication: APS Diplomat Recorder (Newsletter)
Date: June 16, 2007
Publisher: Thomson Gale
Volume: 66 Issue: 26

Distributed by Thomson Gale
Related Search : 18 eu , relations june , aps diplomat

ARAB EUROPEAN RELATIONS - June 20 - EU To Release Aid To PA.(Palestine National Authority): An article from: APS Diplomat Recorder

Format : HTML Author : Gale Reference Team Number of Pages : 4 Release Date : 2007-07-11 Publisher : Thomson Gale List Price : $9.95 Amazon Price : $9.95

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This digital document is an article from APS Diplomat Recorder, published by Thomson Gale on June 23, 2007. The length of the article is 1003 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: ARAB EUROPEAN RELATIONS - June 20 - EU To Release Aid To PA.(Palestine National Authority)
Author: Gale Reference Team
Publication: APS Diplomat Recorder (Newsletter)
Date: June 23, 2007
Publisher: Thomson Gale
Volume: 66 Issue: 25

Distributed by Thomson Gale
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Minimizing the weighted number of tardy jobs on a single machine with release dates [An article from: European Journal of Operational Research]

Format : HTML Author : R. M'Hallah Publisher : Elsevier List Price : $7.95 Amazon Price : $7.95

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This digital document is a journal article from European Journal of Operational Research, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
In this paper, we describe an exact algorithm to minimize the weighted number of tardy jobs on a single machine with release dates. The algorithm uses branch-and-bound; a surrogate relaxation resulting in a multiple-choice knapsack provides the bounds. Extensive computational experiments indicate the proposed exact algorithm solves either weighted or unweighted problems. It solves the hardest problems to date. Indeed, it solves all previously unsolved instances. Its run time is the shortest to date. Scope and purpose: In many industrial sectors, satisfying due dates is a critical issue. Thus, lateness related measures such as the weighted number of tardy jobs are relevant performance measures of schedules in these industries. Our paper studies minimizing the weighted number of tardy jobs on a single machine with release and due dates, and proposes a new exact algorithm. For both weighted and unweighted problems, the exact algorithm solves the largest problems to date.
Related Search : operational research , machine with , number tardy

Short-term survival and dispersal of translocated European wild rabbits. Improving the release protocol [An article from: Biological Conservation]

Format : HTML Author : C. Calvete Publisher : Elsevier List Price : $8.95 Amazon Price : $8.95

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This digital document is a journal article from Biological Conservation, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Translocation of European wild rabbit Oryctolagus cuniculus L. is one of the most frequent management tools to increase rabbit density in Spain, both as prey of several predators that are threatened with extinction and for sport hunting. Nevertheless the elevated short-term mortality by predation makes translocations unsuccessful and increases their biological cost. Information on the factors affecting the short-term survival and dispersal of translocated rabbits is required to improve release management and increase performance of translocated rabbits, and to avoid the use of non-selective lethal methods for predator control. In this study we tested electric fencing and night-shooting as alternative to traditional release protocols, and the effects of vegetation cover and warren fencing on short-term survival and dispersal of rabbits. Night shooting performed during the first nights after release increased significantly the survival of rabbits, by hindering the activity of carnivores in the release area. The use of an electric fence enclosure also increased the performance of rabbits, but was not efficient to constraint rabbit dispersal. Rabbits released in areas with low vegetation cover showed higher mortality and dispersal distances than rabbits released in high cover areas. Warren fencing decreased both the dispersal of rabbits and the adverse impact of predation in low cover areas, but had no effect in high cover areas. Selection of high cover areas or warren fencing in low cover areas seem to be the most advantageous release conditions to decrease the short-term predation impact, reducing the biological cost of rabbit translocations and the risks for endangered predators derived from the use of traditional predator control practices during translocations.
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