Relevant bibliographies by topics / AMPL/CPLEX

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'AMPL/CPLEX'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "AMPL/CPLEX"

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Smith, Martin L. "Optimizing short-term production schedules in surface mining: Integrating mine modeling software with AMPL/CPLEX." International Journal of Surface Mining, Reclamation and Environment 12, no. 4 (January 1998): 149–55. http://dx.doi.org/10.1080/09208118908944038.

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Yong, Wang, Bian Haihong, and Wang Chunning. "Research on Charging and Discharging Dispatching Strategy for Electric Vehicles." Open Fuels & Energy Science Journal 8, no. 1 (September 10, 2015): 176–82. http://dx.doi.org/10.2174/1876973x01508010176.

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The popularity of electric vehicles may lead to negative effects on the power system if the charging procedures of plug-in electric vehicles (PEVs) are uncoordinated. In order to solve the problem, the hierarchical and zonal dispatching architecture and a new bi-level optimization model are respectively presented for the charging/discharging schedules of the PEVs. The upper level model is devoted to minimizing the system load variance so as to implement peak load shifting by optimizing the dispatching plan of all periods for each electric vehicle aggregator (EVA), and the lower one is aimed at tracing the dispatching scheme determined by the upper decision-maker through presenting an optimal schedule of charging and discharging for electric vehicles in the charging areas. Two highly efficient commercial solvers, AMPL/IPOPT and AMPL/CPLEX respectively, are employed to solve the developed optimization problem. Finally, the testing IEEE system consisting of 5 agents and 30 nodes is adopted to illustrate the characteristics of the model and solving method presented in this paper.
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Li, Hongwei, Yuvraj Gajpal, Chirag Surti, Dongliang Cai, and Amit Kumar Bhardwaj. "Nature-Inspired Metaheuristics for Two-Agent Scheduling with Due Date and Release Time." Complexity 2020 (December 29, 2020): 1–13. http://dx.doi.org/10.1155/2020/1385049.

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This paper delves into a two-agent scheduling problem in which two agents are competing for a single resource. Each agent has a set of jobs to be processed by a single machine. The processing time, release time, weight, and the due dates of each job are known in advance. Both agents have their objectives, which are conflicting in nature. The first agent tries to minimize the total completion time, while the second agent tries to minimize the number of tardy jobs. The two agents’ scheduling problem, an NP-hard problem, has a wide variety of applications ranging from the manufacturing industry to the cloud computing service provider. Due to the wide applicability, each variation of the problem requires a different algorithm, adapted according to the user’s requirements. This paper provides mathematical models, heuristic algorithms, and two nature-based metaheuristic algorithms to solve the problem. The algorithm’s performance was gauged against the optimal solution obtained from the AMPL-CPLEX solver for both solution quality and computational time. The outlined metaheuristics produce a solution that is comparable with a short computational time. The proposed metaheuristics even have a better solution than the CPLEX solver for medium-size problems, whereas the computation times are much less than the CPLEX solvers.
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Buaphut, Natthaporn, and Nanthi Suthikarnnarunai. "Oil Distribution through Pipeline Expansion under Levelized Tariff: Study on Sustainable Energy Strategy in the Northern Region of Thailand." Advanced Materials Research 962-965 (June 2014): 1943–46. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.1943.

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Oil distribution is large-scale multimodal systems and never considers sustainable of operation under levelized tariff while Thailand has a policy to reduce retail oil price differential gap which is unfavorable for upcountry residents. This study proposes sustainable evaluation for national energy strategy of oil distribution to the northern region of Thailand through pipeline expansion under levelized tariff. Strategic model is formulated on linear functions and used to explore value of evaluation factors. AMPL with CPLEX is powerful solver for optimizing these programming problems. In the process of model validation, oil distribution characteristics of base system are compared with previous strategic study. After analysis, the results of levelized tariff systems show success of evaluation and express appropriated oil distribution system under levelized tariff which should be enacted to operate in this region.
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Correa Issi, Gustavo, Rodrigo Linfati, and John Willmer Escobar. "Mathematical Optimization Model for Truck Scheduling in a Distribution Center with a Mixed Service-Mode Dock Area." Journal of Advanced Transportation 2020 (November 27, 2020): 1–13. http://dx.doi.org/10.1155/2020/8813372.

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Cross-docking is a logistics strategy in which products arriving at a distribution center are unloaded from inbound trucks and sorted for transfer directly to outbound trucks, reducing costs and storage and product handling times. This paper addresses a cross-docking problem by designing a mixed-integer linear programming (MILP) model to determine a schedule for inbound and outbound trucks in a mixed service-mode dock area that minimizes the time from when the first inbound truck arrives until the last outbound truck departs (makespan). The model is developed using AMPL software with the CPLEX and Gurobi solvers, which provide results for different instances, most of these with actual shift data from an integrated distribution center of a multinational food company located in Concepción, Chile. The results obtained from the case study are notable and show the effectiveness of the proposed mathematical model.
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Hasan, M. Babul, and John F. Raffensperger. "A Decomposition-Based Pricing Method for Solving a Large-Scale MILP Model for an Integrated Fishery." Journal of Applied Mathematics and Decision Sciences 2007 (August 22, 2007): 1–11. http://dx.doi.org/10.1155/2007/56404.

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We study the integrated fishery planning problem (IFP). In this problem, a fishery manager must schedule fishing trawlers to determine when and where the trawlers should go fishing and when the trawlers should return the caught fish to the factory. The manager must then decide how to process the fish into products at the factory. The objective is to maximize profit. We have found that IFP is difficult to solve. The initial formulations for several planning horizons are solved using the AMPL modelling language and CPLEX with branch and bound. The IFP can be decomposed into a trawler-scheduling subproblem and a fish-processing subproblem in two different ways by relaxing different sets of constraints. We tried conventional decomposition techniques including subgradient optimization and Dantzig-Wolfe decomposition, both of which were unacceptably slow. We then developed a decomposition-based pricing method for solving the large fishery model, which gives excellent computation times. Numerical results for several planning horizon models are presented.
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Boonsam, Prat, Nanthi Suthikarnnarunai, and Wanchai Rattanawong. "Efficiency Improvement for Multi Depot Vehicle Routing: A Case Study in Cash Distribution." Applied Mechanics and Materials 284-287 (January 2013): 3667–74. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.3667.

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This research is aimed at increasing efficiency of cash distribution from three distribution centers delivered to 377 branches, and 3,699 automatic teller machines by using Cluster First – Route Second technique. New concept of assignment problem with time window is presented in this paper for clustering. A Group Sweep Algorithm which is modified from a traditional Sweep Algorithm combined with a nearest neighbor search is also presented as the routing methodology. Application software has developed using PHP and MySQL. AMPL with CPLEX 10.0 is used to solve the assignment problem and is perfectly embraced underneath the developed application software to allow the user friendly experience. The software allow the flexibility in changing various parameters such as, capacity proportion of each cash distribution center, speed of vehicle, service time at each branch or ATM, time window of each branch or ATM or distribution center, etc. The result shows that 11 vehicle can be reduced resulting in cost reduction in a total amount of US$195,097 annually
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Latha, P. G., S. R. Anand, Ahamed T. P. Imthias, and Dr P. S. Sreejith. "Commercial Impact and Optimum Capacity Determination of Pumped Storage Hydro Plant for a Practical Power System." International Journal of Emerging Electric Power Systems 14, no. 3 (June 19, 2013): 245–54. http://dx.doi.org/10.1515/ijeeps-2012-0025.

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Abstract This paper attempts to study the commercial impact of pumped storage hydro plant on the operation of a stressed power system. The paper further attempts to compute the optimum capacity of the pumped storage scheme that can be provided on commercial basis for a practical power system. Unlike the analysis of commercial aspects of pumped storage scheme attempted in several papers, this paper is presented from the point of view of power system management of a practical system considering the impact of the scheme on the economic operation of the system. A realistic case study is presented as the many factors that influence the pumped storage operation vary widely from one system to another. The suitability of pumped storage for the particular generation mix of a system is well explored in the paper. To substantiate the economic impact of pumped storage on the system, the problem is formulated as a short-term hydrothermal scheduling problem involving power purchase which optimizes the quantum of power to be scheduled and the duration of operation. The optimization model is formulated using an algebraic modeling language, AMPL, which is then solved using the advanced MILP solver CPLEX.
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You, Meng, Yiyong Xiao, Siyue Zhang, Shenghan Zhou, Pei Yang, and Xing Pan. "Modeling the Capacitated Multi-Level Lot-Sizing Problem under Time-Varying Environments and a Fix-and-Optimize Solution Approach." Entropy 21, no. 4 (April 7, 2019): 377. http://dx.doi.org/10.3390/e21040377.

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In this study, we investigated the time-varying capacitated lot-sizing problem under a fast-changing production environment, where production factors such as the setup costs, inventory-holding costs, production capacities, or even material prices may be subject to continuous changes during the entire planning horizon. Traditional lot-sizing theorems and algorithms, which often assume a constant production environment, are no longer fit for this situation. We analyzed the time-varying environment of today’s agile enterprises and modeled the time-varying setup costs and the time-varying production capacities. Based on these, we presented two mixed-integer linear programming models for the time-varying capacitated single-level lot-sizing problem and the time-varying capacitated multi-level lot-sizing problem, respectively, with considerations on the impact of time-varying environments and dynamic capacity constraints. New properties of these models were analyzed on the solution’s feasibility and optimality. The solution quality was evaluated in terms of the entropy which indicated that the optimized production system had a lower value than that of the unoptimized one. A number of computational experiments were conducted on well-known benchmark problem instances using the AMPL/CPLEX to verify the proposed models and to test the computational effectiveness and efficiency, which showed that the new models are applicable to the time-varying environment. Two of the benchmark problems were updated with new best-known solutions in the experiments.
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Cifuentes, Nayaret, Gustavo Gatica, and Rodrigo Linfati. "Un modelo de programación lineal para el problema de máquinas paralelas no relacionadas en el área de secado de un aserradero en Chile." Revista Facultad de Ingeniería 26, no. 46 (September 5, 2017). http://dx.doi.org/10.19053/01211129.v26.n46.2017.7309.

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Scheduling of activities in manufacturing and service enterprises should perform efficiently, since it impacts both productivity and competitiveness. This study analyzes a real case of green wood dryers in a sawmill in Chile, with a set of ten parallel machines with three different technologies, with 161 jobs, on a monthly planning horizon. The methodology considered two stages: first, the products were grouped by density and fiber type; second, a mathematical model was proposed based on linear programming, which was modeled with AMPL software. In addition, we conducted a statistical analysis to evaluate the solution quality and the computing times, using the CPLEX and GUROBI commercial solvers. The results of the computational experiment showed a reduction in the makespan of 8.5 %, allowing us to conclude that the solver CPLEX is better than the solver GUROBI, regarding CPU time and number of instances optimally solved in 59.3 % of the analyzed cases. The most influential parameters for computing time were GUROBI cuts (evaluated at 0), CPLEX mipcuts (evaluated at 2), and repeatpresolve (evaluated at 0). The time difference in the latter parameter was statistically significant.
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Dissertations / Theses on the topic "AMPL/CPLEX"

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Andersson, Joakim, and Peter Lindberg. "Robust optimering vid design av telekommunikationsnätverk." Thesis, Linköping University, Department of Science and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2335.

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Detta examensarbete har utförts på och i samarbete med ITN, Institutionen för Teknik och Naturvetenskap, vid Linköpings Universitet. Problemställningen härrör från tidigare projektsamarbete mellan Linköpings Universitet, Telia AB och Ericsson. Uppgiften består i att ta fram en optimeringsalgoritm som använder sig av ett nytt angreppssätt genom att försöka minska osäkerheten på indata.

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Fridlund, Erik, and Malgorzata Wieczorek. "Optimizing the distribution of housing lots at Berga äng." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177398.

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Eftersom det råder bostadsbrist i Sverige finns det ett stort behov att producera bostäder på ett mer effektivt och prisvärt tillvägagångsätt. Det är Sveriges kommuner som ansvarar för planprocessen och de har en stor utmaning att hitta nya innovativa sätt att utveckla och effektivisera planprocessen. Linköpings kommun har vid planprocessen för bostadsområdet Berga äng valt att testa en samverkansform som kallas för byggherresamverkan. Det innebär att byggherrar får vara med och påverka planprocessen, förhoppningen är att genom det göra den mer effektiv och såldes kunna producera bostäder snabbare. För Berga äng har sex byggherrar vunnit en markanvisningstävling och är det är dessa som kommer vara en del av byggherresamverkan för området. Vid tävlingen tilldelades också byggherrarna hur många samt vilken bostadstyp – bostadsrätt eller hyresrätt – som de fick bygga. Inom byggbranschen finns det få standardiseringar då förutsättningarna för varje projekt förändras. Dessa förutsättningar gör att bygglogistiken har en stor påverkansgrad för hur snabbt bostäder kan produceras. För Berga äng har Linköpings kommun gett byggherrarna ansvaret att bestämma vilken byggherre som ska bygga på vilken tomt. Det innebär en förhandling mellan byggherrarna för att komma överens om en fördelning av tomterna. Det kan göras genom att godtyckligt förhandla fram en lösning men byggherrarna har eftersökt ett neutralt perspektiv vilket kan göras genom att använda sig av optimering. Syftet med denna studie är att genom en optimeringsmodell fördela ut tomterna mellan byggherrarna. Intervjuer genomfördes för att få en förståelse för byggherresamverkan och hur byggherrarna värderade tomterna. Utifrån dessa togs sedan en optimeringsmodell fram. För att optimeringsmodellen skulle kunna fördela ut tomterna mellan byggherrarna behövde alla tomter värderas till ett numeriskt värde. Olika värderingsmetoder undersöktes och där en värderingsmetod valdes vilket innebar att alla byggherrarna fick rangordna alla tomter. Dessa värderingar användes i optimeringsmodellen för att kunna fördela ut tomterna mellan byggherrarna. Tre resultat presenterades med olika fördelningar samt hur bra byggherrarna ansåg respektive resultat var. Studiens slutsats visar vad som var viktig för att kunna fördela tomterna i Berga äng men även vad som är viktigt på ett mer övergripande plan.

Examensarbetet är utfört vid Institutionen för teknik och naturvetenskap (ITN) vid Tekniska fakulteten, Linköpings universitet

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Elianti, Luca. "Implementazione e test di modelli di ottimizzazione per la pianificazione tattica del blocco operatorio." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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In questa tesi è stato analizzato e tradotto nel linguaggio di alto livello AMPL un modello di ILP relativo alla pianificazione tattica del blocco operatorio. L'obiettivo è quello di permettere l'interfacciamento con numerosi solver -commerciali e non- al fine di analizzarne le prestazioni. In seguito a un'introduzione in merito al problema dell'Operating Room Management e a una descrizione del contesto sanitario regionale dell'Emilia-Romagna, si è proceduto alla descrizione formale del modello. Infine sono state eseguite numerose risoluzioni con i solver cplex e gurobi al variare di alcuni parametri in ingresso, tra cui il numero di sale operatorie, di infermieri e operatori sanitari, e di pazienti in lista d'attesa.
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Conference papers on the topic "AMPL/CPLEX"

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Zuo, Xiaorong, Chuan Zhu, Changhao Huang, and Yiyong Xiao. "Using AMPL/CPLEX to model and solve the electric vehicle routing problem (EVRP) with heterogeneous mixed fleet." In 2017 29th Chinese Control And Decision Conference (CCDC). IEEE, 2017. http://dx.doi.org/10.1109/ccdc.2017.7979321.

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A. Martinez, Norberto, Alejandra T. Pozos, and John F. Franco. "Análise Técnica e Econômica da Alocação Ótima de Baterias no Sistema de Distribuição de Energia Elétrica." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1712.

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Sistemas de baterias podem ser usados no sistema de distribuição de energia elétrica para obter vantagens técnicas e econômicas, podendo armazenar e descarregar energia quando for economicamente ou tecnicamente atrativo ou também armazenar o excedente de geração renovável para que essa energia seja usada em momento mais conveniente. Devido ao alto custo de sistemas de baterias, estudos técnicos e econômicos são necessários para avaliar sua adequada alocação no sistema de distribuição. Assim, neste trabalho é proposto um modelo matemático de programação cônico de segunda ordem inteira mista para a ótima alocação de baterias no sistema de distribuição de energia. Indicadores econômicos, como a taxa interna de retorno e valor presente líquido, são utilizados para uma análise econômica que considera a vida útil técnica dos equipamentos. Também é feita uma comparação da operação do sistema de distribuição com e sem a alocação de baterias em redes com presença de geração distribuída renovável. O problema de otimização foi modelado com a linguagem matemática AMPL e resolvido usando o solver comercial CPLEX. Os resultados de casos de estudo usando um sistema de 33 barras mostram a importância da análise econômica e técnica da alocação de sistemas de baterias.
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M. de Sá, Sarah, Michael Douglas L. Pereira, and John F. Franco. "Programação Linear Aplicada ao Carregamento Coordenado de Veículos Elétricos em Redes de Distribuição." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1676.

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A pressão da comunidade para reduzir as emissões de gases de efeito estufa, aliada à baixa eficiência do motor a combustão e às melhorias nas tecnologias de armazenamento de energia dos veículos elétricos (VEs), resultou no aumento desses automóveis nos últimos anos. Porém, o carregamento simultâneo de um grande número de VEs pode trazer impactos significativos no sistema de distribuição de energia elé-trica. Nesse contexto, este artigo apresenta um modelo de programação cônica de segunda ordem inteira mista e um modelo linear para o carregamento coordenado dos VEs. As formulações propostas têm co-mo objetivo a minimização da energia não carregada, assim como do tempo de carregamento para cada VE, satisfazendo as restrições de operação da rede. Os modelos matemáticos foram implementados na linguagem de modelagem matemática AMPL e testados em sistemas de 33 barras e de 136 barras, sendo resolvidos usando o solver CPLEX. Inicialmente foram avaliados os principais impactos que a rede sofre com o carregamento descoordenado dos VEs. Na sequência, são apresentadas as melhorias que os mo-delos cônico e linear proporcionam à rede. Esses resultados confirmam a eficiência dos modelos propos-tos na solução do carregamento coordenado de VEs, contribuindo para facilitar sua integração nas redes de distribuição.
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L. Pereira, Michael Douglas, Sarah M. de Sá, Lucas T. Faria, and John F. Franco. "Programação Estocástica Aplicada ao Controle Ótimo de Geração Fotovoltaica em Redes de Distribuição de Energia Elétrica." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1751.

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O aumento da geração fotovoltaica na rede de distribuição de energia elétrica pode trazer bene-fícios como redução na conta de energia dos usuários e aproveitamento do potencial renovável. Entretanto, o excesso de geração pode causar problemas na operação da rede de distribuição como sobretensão, sobre-cargas e aumento nas perdas. Uma alternativa para mitigar esses problemas é o controle da geração fo-tovoltaica, de forma que o excesso de geração seja cortado para manter uma operação dentro dos limites técnicos (tensões nas barras e correntes nas linhas). Este trabalho propõe um modelo de otimização cônico de segunda ordem a fim de reduzir esforços computacionais e garantir soluções de boa qualidade. Um modelo linearizado é também derivado, sendo ambas abordagens baseadas em Programação Estocástica, para o problema de controle da geração fotovoltaica no sistema de distribuição. Os modelos foram desen-volvidos na linguagem de modelagem matemática AMPL e resolvidos usando o solver CPLEX. Seu de-sempenho foi avaliado por meio de sistemas de distribuição de 33 e 136 barras para o gerenciamento das unidades de geração distribuída de forma a maximizar a captação de energia renovável. A proposta identi-ficou o corte de geração necessário para resolver efetivamente os problemas de operação do sistema de distribuição.
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