708 research outputs found

    Free and regular mixed-model sequences by a linear program-assisted hybrid algorithm GRASP-LP

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    A linear program-assisted hybrid algorithm (GRASP-LP) is presented to solve a mixed-model sequencing problem in an assembly line. The issue of the problem is to obtain manufacturing sequences of product models with the minimum work overload, allowing the free interruption of operations at workstations and preserving the production mix. The implemented GRASP-LP is compared with other procedures through a case study linked with the Nissan’ Engine Plant from Barcelona.Peer ReviewedPostprint (author's final draft

    Issues and Conflicts in the Management of the Public Domain of the Saddle Mountains in Eastern Washington: A Case Study

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    This thesis examines the prehistoric, historic, and contemporary patterns of land use and their effects in the Saddle Mountains of eastern Washington. Federal laws and Indian treaties require that federal lands be managed to preserve natural and cultural resources while meeting the demands of private interests for economic development and of the general public for recreational access. Land management conflicts created by these diverse interests are reviewed in the context of the history of the study area, the legal framework that directs its management, and the management process as it actually works. It concludes with recommendations to resolve land use conflicts

    An Assessment of Preservation Opportunities in the New Jersey Pine Barrens

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    The Pine Barrens of southern New Jersey is a 1.4 million acre expanse of dense forest that is one of the most unique ecological regions on the planet. From the late 17th century until the 1890\u27s, a series of industries flourished deep within the Pine Barrens, forever altering the region\u27s physical and cultural landscape. Of these industries, none had a greater impact on the region than the iron business. Although sites and ruins associated with the iron industry are still found throughout the Pine Barrens in various stages of decay, all of the industrial sites that remain comprise a cultural resource group that has the potential to yield important information about local and national history. Under the National Parks and Recreation Act of 1978, Congress set aside 1.1 million acres of the Pine Barrens to create the nation\u27s very first National Reserve. This federally protected region is managed by a 15-member independent state agency called the Pinelands Commission, which regulates development and cultural resource preservation according to a Comprehensive Master Plan (CMP) and Cultural Resource Management Plan (CRMP). Published in 1981 and 1986, respectively, these plans have shaped historic preservation policy and cultural resource management in the Pinelands National Reserve. With a focus on sites associated with the iron industry, this thesis examines both the CMP and CRMP in order to ascertain the extent to which ecology has been favored over cultural resource preservation, and makes detailed recommendations that advocate for a balance between the preservation of nature and culture

    Environmental statement: Kittitas land management plan, Wenatchee National Forest, Kittitas and Chelan Counties, Washington

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    There are no author-identified significant results in this report

    RECREATION ALLOCATIONS ON NATIONAL FORESTS: THE CLAIMS AND FRAMES OF RECREATIONISTS

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    While demand for outdoor recreation experiences on national forests is increasing, many existing recreation allocations on national forests are outdated or jeopardize the environment. Accordingly, the U.S. Forest Service is revisiting recreation allocations on many national forests. The Forest Service is not guided by any clear policy regarding the appropriate method or rationale for making allocations between incompatible experience opportunities, or what criteria should be considered in allocating particular trails and areas. Instead individual decisionmakers must make judgments between competing claims advanced by different types of recreationists. This project was designed to facilitate understanding of the claims that recreationists make to national forests, in an attempt provide decisionmakers and stakeholders a way to think clearly about the foundations and implications of the claims that they make and hear. To accomplish this, I executed a discourse analysis case study on the Gallatin National Forest. In addition to contextual research, I conducted, coded, and analyzed semi-structured, in-depth interviews with 35 hikers and off-road vehicle (ORV) drivers in south-central Montana. The study indicated that the claims and views of hikers and ORV drivers differed in a number of important ways. First, most hikers stated that national forests should be managed to protect the natural environment, while most ORV drivers stated that the national forests should be managed for multiple uses, including ORV driving. Second, most hikers claimed that ORV impacts on the natural environment are significant enough to necessitate reductions in allocations to driving; most ORV drivers believed the impacts of ORVs and other types of forest recreation to be similar and nonsignificant. While specific claims varied within the two groups, hikers and ORV drivers embedded their claims in consistent and contrasting narratives which elided the contradictions and limitations of specific claims to support general propositions to the effect that allocation to their use should be prioritized. Judicious allocation of national forest recreation opportunities depends upon improved understanding of and articulation of claims. This study offers a conceptual framework for considering claims with the hope of improving the coherency, transparency, credibility, and wisdom of recreation allocations

    A hybrid dynamic programming for solving a mixed-model sequencing problem with production mix restriction and free interruptions

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    In this article, we propose a hybrid procedure based on bounded dynamic programming assisted by linear programming to solve the mixed-model sequencing problem with workload minimization with serial workstations, free interruption of the operations and with production mix restrictions. We performed a computational experiment with 23 instances related to a case study of the Nissan powertrain plant located in Barcelona. The results of our proposal are compared with those obtained by mixed integer linear programming.Peer ReviewedPostprint (author's final draft

    Interest Representation and the Federal Land Policy and Management Act

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    The role of the BLM under the FLPMA, this Note argues, is accurately captured in the interest representation model of administrative law; judicial review under this model serves to vindicate the participation rights of parties interested in public lands management. Part I places the FLPMA in the context of other recent congressional reform efforts and attempts to justify heightened judicial scrutiny of the BLM\u27s activities. To protect citizens\u27 participation rights, it concludes, courts should recognize a limited right to initiate the planning and management provisions of the FLPMA. The Act, in other words, should be interpreted to comprehend agenda forcing by the public. Part II uses the persistent problem of conflicts among recreational users of public lands to illustrate the need for agenda-forcing action by citizens to effectuate congressional intent

    Gila Box Area: Gila Box Riparian National Conservation Area, and the Fishhooks and Needle\u27s Eye Wilderness Areas

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    23 p. : ill., maphttps://scholar.law.colorado.edu/books_reports_studies/1017/thumbnail.jp

    Modelado y resolución de problemas de secuenciación en contexto JIT/DS mediante BDP

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    This document develops the doctoral thesis entitled "Modelado y resolución de problemas de secuenciación en contexto JIT/DS mediante BDP". Through a literature review we explain the problems, within the environment of the sequence problems in production systems. Then, we describe the problems under study, the MMSP-W (Mixed-Model Sequencing Problem with Work overload Minimization), the BFSP (Blocking Flow Shop Problem) and the ORV (Output Rate Variation Problem). Then, a resolution procedure based on BDP (Bounded Dynamic Programming) to solve the problems is proposed. Finally, the results of the proposed procedure are compared with others based on for example linear programming or heuristics.Este documento desarrolla la tesis doctoral titulada “Modelado y resolución de problemas de secuenciación en contexto JIT/DS mediante BDP”. A través de una revisión de la literatura se explican los problemas objeto de estudio, enmarcándolo dentro del entorno de la secuenciación en los sistemas productivos. A continuación se describen dichos problemas, el MMSP-W (Mixed-Model Sequencing Problem with Work overload Minimization), el BFSP (Blocking Flow Shop Problem) y el ORV (Output Rate Variation Problem). Finalmente se proponen algoritmos de resolución para dichos problemas basados en BDP (Bounded Dynamic Programming o programación dinámica acotada) y se compara la calidad de los procedimientos propuestos con otros basados en programación lineal o heurística
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