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PRODUCTION PLANNING & CONTROL 2007年第7期18卷 584-591页

作者： Wang, F. K. Du, T. Wen, F. C. Natl Taiwan Univ Sci & Technol Dept Ind Management Taipei Taiwan Chinese Univ Hong Kong Dept Decis Sci & Managerial Econ Sha Tin 100083 Hong Kong Peoples R China

As operational costs and equipment depreciation in the TFT-LCD (thin film transistor-liquid crystal display) industry are a high percentage of the total cost, most manufacturers usually fully utilise their production capacity to reduce the average unit cost. However, when the market demand is less than the supply the stock of panels increases;this forces manufacturers to instigate a price war to reduce levels of stock and results in a wide fluctuation in panel prices. Inventory stocks of panels could be decreased by optimising the product mix. This will help manufacturers to reduce the risk of holding stocks, increase profit, and improve competitive advantage. This study uses mixed integer linear programming (MILP) to construct a product mix for the TFT-LCD industry given the conditions of profit, productivity, raw materials supply, and market demand. A case study shows that this model is proven to be effective in generating product mix for the TFT-LCD industry while improving profit. The product mix generated by this model can provide a reference for the sales department for orders and shipping, for the production department for the order quantity, and for master production scheduling for each product.

关键词： TFT-LCD product mix mixed integer linear programming

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A capacity planning model in the TFT-LCD production chain

A capacity planning model in the TFT-LCD production chain

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IEEE International Conference on Service Operations and Logistics and Informatics

作者： Lin, James T. Chen, Tzu-Li Natl Tsing Hua Univ Dept Ind Engn & Engn Management Hsinchu 300 Taiwan

ISBN: (纸本)9781424411177

The paper studies the capacity planning problem in the TFT-LCD production chain. Due to two significant trends, the capacity planning decision gradually becomes an important strategic issue to which TFT-LCD industry paid attention. First is the increase of product types which causes a wide range of product groups, such as mobile, monitor, notebook, TV and industrial display are produced. The second trend is the advances of new technology which cause multiple generations of technologies coexist in each manufacturing stage and production site. This paper proposes a mixed integer linear programming (MILP) to formulate the capacity planning which considers many practical characteristics and constraints in TFT-LCD production chain. A heuristic algorithm is developed to solve the MILP model.

关键词： capacity planning TFT-LCD mixed integer linear programming

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Phase shifter placement in large-scale systems via mixed integer linear programming

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IEEE TRANSACTIONS ON POWER SYSTEMS 2003年第3期18卷 1029-1034页

作者： Lima, FGA Galiana, FD Kockar, I Munoz, J Univ Fed Mato Grosso do Sul Dept Elect Engn BR-79070900 Campo Grande MS Brazil McGill Univ Dept Elect & Comp Engn Montreal PQ H2X 2K7 Canada ETS Ingn Ind Malaga 29013 Spain

This paper makes use of recent advances in mixed integer linear programming (MILP) to conduct a preliminary design study on the combinatorial optimal placement of thyristor controlled phase shifter transformers (TCPSTs) in large-scale power systems. The procedure finds the number, network location, and settings of phase shifters that maximize system loadability under the dc load flow model, subject to limits on the installation investment or total number of TCPSTs. It also accounts for active flow and generation limits, and phase shifter constraints. Simulation results are presented for the IEEE 24-, 118-, and 300-bus systems, as well as a 904-bus network. The principal characteristics of our approach are compared with those of other published flexible ac system transmission (FACTS) allocation methods.

关键词： FACTS large-scale systems mixed integer linear programming phase shifters system loadability

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Um modelo matemático para estudo de otimização do consumo de energia elétrica

Um modelo matemático para estudo de otimização do consumo...

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作者： Silva, Mariellen Vital da Universidade Estadual Paulista

Neste trabalho, otimiza-se o funcionamento de uma fábrica desidratadora de forragens localizada na Espanha. Esta possui processos seqüenciados, secagem, produção de fardos de feno e produção de grãos, que para serem realizados consomem quantidades distintas de energia. Estabelecem-se então, os períodos de produção para cada processo, juntamente com a quantidade em toneladas a serem produzidas, sabendo que na Espanha a energia elétrica possui vinte e quatro preços, um para cada hora do dia. É proposto um modelo para a função objetivo, utilizando dados históricos de produção (Ton), consumo (kWh) e tempo (h), que retratará o funcionamento da empresa. Este modelo é obtido por meio de regressão linear múltipla e é implementado utilizando o software Lingo. Os resultados dessa implementação fornecerão as horas totais diárias que cada processo deverá ser realizado, juntamente com a quantidade de toneladas de pacotes de feno e grãos, e o custo diário da energia elétrica para realizar a produçã*** this work, optimize of the functioning of a plant that dehydrates fodder plants located in Spain. This possess sequenced processes, drying, production of hay packs and production of grains, which to be carried through consumes distinct amounts of energy. Then, the periods of production for each process are established, together with the amount in tons to be produced, knowing that in Spain the electric energy possess twenty and four prices, one for each hour of the day. It is considered a model for the objective function, by using given historical data of production (Ton), consumption (kWh) and time (h), that the functioning of the company will portray. This model is gotten by means of multiple linear regression and is implemented using software Lingo. The results of this implementation will supply the daily total hours that each process will have to be carried through, with the amount of tons of packages of hay and grains , and the daily cost of the electric energy to carry through

关键词： Análise de regressão Otimização matematica Energia eletrica - Consumo Energia elétrica - Custos Programação linear Simple linear regression Multiple linear regression Optimization mixed integer linear programming Dissertação de mestrado

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Auction mechanism of energy with hydro constraints

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REVISTA TECNICA DE LA FACULTAD DE INGENIERIA UNIVERSIDAD DEL ZULIA 2007年第SPEC. ISSUE期30卷 290-299页

作者： Marulanda Guerra, Agustin R. Fuenmayor Andrade, Kilkenis Univ Zulia Dept Potencia Escuela Ingn Elect Fac Ingn Maracaibo 4011 Venezuela

In a competitive electricity market generation companies have to maximize their benefits selecting the best strategy, therefore it is necessary to previously know the spot price. This paper presents a model to determine market clearing prices and hourly generation levels of each participant over a 24-hour period including into the model hydrothermal constraints. The optimal competitive market equilibrium problem is formulated as a large-scale mixed integer linear programming algorithm and is solved by using an optimisation package. The model incorporates the following elements: thermal plants (maximum up and down ramp), hydro units, hydro system (cascaded reservoirs, spillway flow, generator I/O characteristic), and inelastic demand. A numerical test of a day ahead market is presented.

关键词： competitive market equilibrium electricity market hydrothermal systems mixed integer linear programming

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Supply chain planning under uncertainty: a fuzzy linear programming approach

Supply chain planning under uncertainty: a fuzzy linear prog...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： David Peidro Josefa Mula Raul Poler Research Centre on Production Management an Engineering Polytechnic University of Valencia Alcoy Alicante Spain

A new fuzzy mathematical programming model for supply chain planning under supply, process and demand uncertainty is proposed in this paper. A tactical supply chain planning problem has been formulated as a fuzzy mixed integer linear programming model where data are ill-known and modelled by triangular fuzzy numbers in the setting of possibility theory. The fuzzy model provides alternative decision plans to the decision maker (DM) for different grades of possibility. Finally, the proposed model is tested by using data from a real automobile supply chain.

关键词： Supply chains Uncertainty linear programming Fuzzy set theory Mathematical programming Mathematical model Process planning mixed integer linear programming Possibility theory Delta modulation

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Development of a new model for the flowshop problem

Development of a new model for the flowshop problem

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IEEE International Conference on Industrial Engineering and Engineering Management

作者： M. M. Mashhadi E. F. Stafford F. T. Tseng University of Tehran Tehran Iran University of Alabama Huntsville USA

ISBN: (纸本)9781424415281;1424415284

A new mixed integer linear programming model for the regular flowshop scheduling problem is proposed in this paper. We show how the model is derived from an existing model mathematically. The new model has less number of constraints than the old model, whereas it has more number of variables. In an experimental design, the new model solves a class of problems in significantly less computational time than the existing model.

关键词： Mathematical model Processor scheduling mixed integer linear programming Job shop scheduling Testing Design for experiments linear programming Fluid flow measurement Time measurement Performance evaluation

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A hybrid algorithm for the input/output scheduling problem of multi-shuttle AS/RSs

A hybrid algorithm for the input/output scheduling problem o...

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SICE Annual Conference

作者： Shunji Tanaka Graduate School of Electrical Engineering Kyoto University Nishikyo Kyoto Japan

ISBN: (纸本)4907764278

This paper proposes a hybrid algorithm for the input/output scheduling problem of multi-shuttle automated storage and retrieval systems (AS/RSs). This problem is to find a minimum travel route of a multi-shuttle storage and retrieval (S/R) machine to process given storage and retrieval requests for a storage rack. The proposed algorithm is based on the exact algorithm previously proposed by the author. In the first stage of the algorithm, a tabu search is used to improve the solutions obtained while column and cut generation is applied to an LP relaxation of the problem. The tabu search solutions are utilized in the second stage as columns of a set-partitioning formulation of the problem, and it is solved by a general MILP solver. The effectiveness of the proposed algorithm is examined by numerical experiments.

关键词： Scheduling algorithm Upper bound Storage automation Vehicles Hybrid power systems Routing linear programming mixed integer linear programming Computational complexity

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Performance Study of Optimal Routing and Channel Assignment in Wireless Mesh Networks

Performance Study of Optimal Routing and Channel Assignment ...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Ching-Ju Lin Sung-Han Lin Cheng-Fu Chou Graduate Institute of Networking and Multimedia National Taiwan University Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

In multi-channel wireless mesh networks (WMNs), the routing and channel assignment can interdependently determine network capacity. However, joint routing and channel assignment (JRC) is a challenging problem since it must satisfy the Radio Constraint , the Channel Constraint, and the Co-channel Interference Constraint . Recently, many heuristic or suboptimization algorithms have been proposed to address the JRC problem. The aim of this paper is to preform a comprehensive performance study to fairly compare the different approaches. To achieve this goal, a proper benchmark, a mixed integer linear programming (MILP) model that can optimally configure the routing and channel assignment to get maximum achievable network capacity, is provided in this work as well. The proposed MILP model can help system designers quantitatively evaluate existing heuristic methods and make a better decision by considering the tradeoff between the characteristics of various schemes according to the system requirements.

关键词： Routing Wireless mesh networks Interference constraints Interchannel interference Heuristic algorithms mixed integer linear programming Aggregates Throughput Computer science Preforms

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An Efficient Node Partitioning Algorithm for the Capacitated Minimum Spanning Tree Problem

An Efficient Node Partitioning Algorithm for the Capacitated...

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International Conference on Computer and Information Science (ACIS)

作者： Jun Han Zhaohao Sun Jinpeng Huai Xian Li School of Computer Science & Engineering Beihang University China School of Economics and Information Systems University of Wollongong Australia

This paper studies the capacitated minimum spanning tree (CMST) problem, which is one of the most fundamental and significant problems in the optimal design of communication networks. A solution method using combined neighborhood search and branch and bound technique is introduced and its performance is presented. The advantage of the algorithm is shown while the process of searching for the optimal solution is illustrated. Computational experiences demonstrate that the proposed strategy significantly improves the efficiency of the previous node-orientated branch and bound algorithm.

关键词： Partitioning algorithms Costs Tree graphs Communication networks Sun Computer science Design engineering Information systems Algorithm design and analysis mixed integer linear programming

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