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3rd IEEE PES International Conference and Exhibition on Innovative Smart Grid Technologies Europe (ISGT Europe)

作者： Lombardi, P. Sokolnikova, T. Suslov, K. V. Styczynski, Z. Fraunhofer Inst Factory Operat & Automat D-39106 Magdeburg Germany Irkutsk State Tech Univ ISTU Dept Power Supply & Elect Engn Irkutsk 664074 Russia Univ Magdeburg D-39106 Magdeburg Germany

ISBN: (纸本)9781467325950;9781467325967

Some Renewable Energy Sources (RES), such as wind and solar, produce power intermittently according to the weather conditions rather than to the power demanded. Energy Storage Systems (ESS) may be used to mitigate the intermittent generation from RES and to increase the quality of power supply. This study aims to find the relationship between the generation from RES and the needed amount of ESS. An autonomous microgrid has been analyzed in which a part of electricity demanded during one year is generated by Wind Turbines and Photovoltaic plants (PV), while the remaining part is produced by fuel based generators. An intelligent Energy Management System (EMS) optimally schedules the fuel based generators according to the load demanded, the weather conditions and to the electricity generation costs. The optimal storage needed to balance the system for different scenarios were investigated and results of this investigation are shown and discussed in this paper.

关键词： Autonomous microgrid energy storage systems mixed integer linear programming renewable energy sources smart grid

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OPTIMAL CHANNEL ASSIGNMENT FOR IEEE 802.11 MULTI-CELL WLANS

OPTIMAL CHANNEL ASSIGNMENT FOR IEEE 802.11 MULTI-CELL WLANS

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20th European Signal Processing Conference (EUSIPCO)

作者： Elwekil, Mohamed Alghoniemy, Masoud El-Khamy, Mostafa Furukawa, Hiroshi Muta, Osamu E JUST Elect & Commun Engn Dept Alexandria Egypt Univ Alexandria Dept Elect Engn Alexandria 21544 Egypt Kyushu Univ Adv Informat Technol Dept Fukuoka 812 Japan

ISBN: (纸本)9781467310680

In this paper, we propose a new formulation for solving the channel assignment problem for Multi-cell WLANs as a mixed integer linear programming (MILP) problem. The objective is to minimize the total interference seen by all Access Points (APs). The main advantage of the proposed algorithm is that it provides a global solution and at the same time guarantees non-overlapping channel assignment. The proposed channel assignment formulation can be used for different topologies of WLAN as demonstrated in the simulation. Simulation results show that the proposed algorithm outperforms the pick-first greedy algorithm and the single channel assignment method. The proposed channel assignment technique reduces the total interference at all APs which leads to an improved throughput.

关键词： WLAN IEEE 802.11 radio resource management channel assignment mixed integer linear programming

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Homing Architectures in Multi-Layer Networks: Cost Optimization and Performance Analysis

Homing Architectures in Multi-Layer Networks: Cost Optimizat...

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作者： Eleni Palkopoulou Chemnitz University of Technology

学位级别：博士

The emergence of multi-layer networking capabilities opens the path for the development of advanced network architectures and resilience concepts. In this dissertation we propose a novel resource-efficient homing scheme: dual homing with shared backup router resources. The proposed scheme realizes shared router-level redundancy, enabled by the emergence of control plane architectures such as generalized multi-protocol label switching. Additionally, virtualization schemes complement the proposed architecture. Different homing architectures are examined and compared under the prism of cost, availability, recovery time and energy efficiency. Multiple network layers are considered in Internet protocol over wavelength divi- sion multiplexing as well as Internet protocol over optical data unit settings - leading to the development of multi-layer optimization techniques. A generic multi-layer network design mathematical model, which can be applied to dif- ferent homing architecture considerations, is developed. The optimization objective can be adapted to either minimizing the cost for network equipment or the power consumption of the network. In order to address potential issues with regard to computational complexity, we develop a novel heuristic approach specifically targeting the proposed architecture. It is shown that significant cost savings can be achieved - even under extreme changes in the traffic demand volume, in the cost for different types of network equipment, as well as in the network topology characteristics. In order to evaluate occurring tradeoffs in terms of performance, we study the effects on availability and recovery time. We proceed to derive lower bounds on end-to-end availability for the different homing architectures. Additionally, an analytical recovery time model is developed and evaluated. We investigate how service-imposed maximum outage requirements have a direct effect on the setting of the proposed architecture.

关键词： homing architectures multi-layer optimization mixed integer linear programming capital expenditures (CAPEX) availability generalized multi-protocol label switching (GMPLS) Internet protocol (IP) optical transport network (OTN)

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Sequential Dynamic Strategies for Real-Time Scheduling of Terminal Traffic

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JOURNAL OF AIRCRAFT 2012年第1期49卷 237-249页

作者： Chen, Heming Zhao, Yiyuan J. Univ Minnesota Minneapolis MN 55455 USA

This paper presents dynamic strategies for the integrated scheduling and runway assignment of both arrival and departure traffic over an airport. While a static scheduling scheme handles traffic over a specified planning horizon simultaneously, sequential dynamic schedulers divide the planning horizon into a series of smaller scheduling windows and apply a static scheduling scheme sequentially over each window. Dynamic scheduling strategies are desirable for obtaining real-time solutions of continual traffic streams and for taking advantage of updated traffic information. In this paper, a multiple-point scheduling framework is used in which scheduling locations include runway thresholds as well as fixes over the terminal airspace and gates on the airport surface. Integrated static scheduling of both arrival and departure traffic is formulated as mixed-integer linear programming. Solution variables include scheduled times of arrival at the multiple scheduling locations and aircraft sequences at merge points. Aircraft route assignments for both ground and airborne traffic are also included as discrete solution variables, from which optimal runway assignments can be determined. Then, different dynamic strategies with either overlapping or nonoverlapping scheduling windows are developed and compared. Induced constraints for ensuring sufficient separations among traffic in neighboring windows are discussed. The John F. Kennedy International Airport is used as the example in extensive numerical solutions to evaluate the computational speeds and scheduling performances of different dynamic strategies.

关键词： Runway Configuration John F. Kennedy International Airport Airspace mixed integer linear programming Estimated Time of Arrival Numerical Simulation Next Generation Air Transportation System Air Traffic Controller Aircraft Performance Aircraft Trajectory

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Modelling of multi-period multi-product production planning considering production routes

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2012年第6期50卷 1749-1766页

作者： Mahdavi, Iraj Taghizadeh, Kaveh Bagherpour, Morteza Solimanpur, Maghsud Mazandaran Univ Sci & Technol Dept Ind Engn Babol Sar Iran Iran Univ Sci & Technol Dept Ind Engn Tehran Iran Urmia Univ Dept Mech Engn Orumiyeh West Azerbaijan Iran

The multi-period multi-product (MPMP) production planning problems, generally, deal with matching production levels of individual products with fluctuated demands over planning horizon. The conventional MPMP optimisation models suffer from insufficient utilisation of available capacity of machines. This fallacy is due to inappropriate formulation of machine capacity and material handling constraints. In this study, a novel mathematical model is proposed to simultaneously optimise production quantities and provide information about managerial decisions such as subcontracting, carrying inventory/backordering, and also hiring/layoff personnel. The problem is then formulated as a mixed integer linear programming (MILP) model by applying appropriate linearisation of non-linear components. The objective is to minimise production costs comprising of production, storage, shortage, subcontracting costs and costs associated with hiring/dismissing labourers. Superiority of the proposed model over existing ones, has been initially evaluated by solving the case presented by Byrne and Bakir [Byrne, M. D. and Bakir, M. A., 1999. Production planning using a hybrid simulation-analytical approach. International Journal of Production Economics, 59 (1), 305-311], and then evaluated by comparing the results obtained from solving both the proposed and the conventional MPMP production planning models using a 100-randomly-generated-test-problem.

关键词： multi-period multi-product production planning mixed integer linear programming aggregate production planning optimisation operational sequence

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An efficient tabu search algorithm for flexible flow shop sequence-dependent group scheduling problems

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2012年第15期50卷 4237-4254页

作者： Shahvari, Omid Salmasi, Nasser Logendran, Rasaratnam Abbasi, Babak Sharif Univ Technol Dept Ind Engn Tehran Iran Mazandaran Univ Sci & Technol Dept Ind Engn Babol Sar Iran Oregon State Univ Sch Mech Ind & Mfg Engn Corvallis OR 97331 USA RMIT Univ Sch Math & Geospatial Sci Melbourne Vic Australia

In this paper, the flexible flow shop sequence-dependent group scheduling problem (FFSDGS) with minimisation of makespan as the criterion (FFm vertical bar fmls, S-plk vertical bar C-max) is investigated. For the first time a mathematical model for the proposed research problem is developed. Since the problem is shown to be NP-hard, six metaheuristic algorithms based on tabu search (TS) are developed to efficiently solve the problem. The proposed metaheuristics are different to the only available metaheuristic algorithm in the literature based on TS. By applying randomised complete block design and using available test problems in the literature, the best of the proposed TS algorithms in this research is identified. The performance of the best developed metaheuristic algorithm is then compared with the existing algorithm in the literature by solving the test problems, also available in the literature, ranging in size from small, medium, to large. A comparison based on paired t-test at 95% confidence interval, shows that the best proposed algorithm in this research has a better performance than the existing algorithm in the literature with an average percentage deviation of around 1.0% for medium and large size problems.

关键词： flexible flow shop sequence-dependent group scheduling tabu search mixed integer linear programming minimisation of makespan

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An integral planning model that includes production, selling price, cash flow management and flexible capacity

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2012年第6期50卷 1568-1581页

作者： Lusa, Amaia Martinez-Costa, Carme Mas-Machuca, Marta Univ Politecn Cataluna IOC Res Inst Dept Management E-08028 Barcelona Spain

Many authors consider that production and marketing decisions should be integrated. In this paper, we discuss an aggregate planning problem that includes production, selling price, cash management and flexible capacity (by means of hiring and firing and with the possibility of unlimited production subcontracting). The demand is considered to be a nonlinear function of the product selling price. The problem, which is modelled as a mixed integer linear program, can be solved using standard optimisation software. The results of a computational experiment and a numerical example are shown to illustrate the performance of the proposed model and obtain some managerial insights.

关键词： integral planning aggregate planning marketing mixed integer linear programming

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Makespan minimisation on parallel batch processing machines with non-identical job sizes and release dates

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2012年第20期50卷 6022-6035页

作者： Ozturk, Onur Espinouse, Marie-Laure Di Mascolo, Maria Gouin, Alexia UJF Grenoble 1 Grenoble INP CNRS G SCOPUMR5272 F-38031 Grenoble France UJF Grenoble 1 Grenoble INP CNRS GIPSA LabUMR 5216 F-38402 St Martin Dheres France

The problem we study in this paper arises from the washing step of hospital sterilisation services. Washers in the washing step are capable of handling more than one medical device set as long as their capacity is not exceeded. The medical device set sizes and arrival times to the sterilisation service may be different, but they all have the same washing duration. Thus, we model the washing step as a batch scheduling problem where medical device sets are treated as jobs with non-identical sizes and release dates, but equal processing times. The main findings we present in this paper are the following. First, we study two special cases for which polynomial algorithms are presented. We then develop a 2-approximation algorithm for the general problem. Finally, we develop a MILP model and compare it with another MILP model from the literature. Computational results show that our MILP model outperforms the model from the literature.

关键词： batch scheduling batch processing heuristics makespan mixed integer linear programming parallel batch scheduling approximation algorithm sterilisation service

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Use of flux pre-analysis to enable ¹³C tracer studies in pyruvate kinase-deficient Escherichia coli

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BIOTECHNOLOGY JOURNAL 2012年第3期7卷 449-462页

作者： Meade, Jonathan Khan, Saleem Ataai, Mohammad Domach, Michael Carnegie Mellon Univ Dept Chem Engn Pittsburgh PA 15213 USA Univ Pittsburgh Dept Microbiol & Mol Genet Pittsburgh PA USA Univ Pittsburgh Dept Chem & Petr Engn Pittsburgh PA 15261 USA

Pyruvate kinase-deficient Escherichia coli (PB25) is a low by-product-producing yet fast-growing mutant that has been shown to have technological potential. Determining the flux limits through finding the extreme point flux sets was previously reported to identify alternate metabolite trafficking scenarios. Previously, the extreme point flux sets were used to design tracer experiments;however, variation in extracellular measurements was not considered, and reaction reversibility was assumed to be low to moderate. In this study, we examined the utility of limiting the fluxes and predetermining the trafficking scenarios in PB25, including confirmation of quasi-linearity between extreme points to ensure sensitivity is maintained. The effects of variation in extracellular measurements and reaction reversibilities were also examined. Tightened flux limits reduced the nonlinearity between label distribution and fluxes. For low to moderate reversibility, contrast was also preserved. However, for highly reversible phosphoglucoisomerase activity, information from common analytes could lead to a flux solution that is biased towards one extreme point. Based on the PB25 model, some suggestions are provided for how predetermining flux limits and trafficking scenarios could enable flux identification in larger network problems.

关键词： C-13 metabolic flux analysis Escherichia coli Flux limits mixed integer linear programming

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A multi-period model for managing used product returns

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2012年第5期50卷 1360-1376页

作者： Nenes, George Nikolaidis, Yiannis Univ Macedonia Dept Technol Management Naousa 59200 Greece Univ Western Macedonia Dept Mech Engn Kozani 50100 Greece

During the last decades there has been a consistent need for companies to manufacture 'green' products in order to contribute to environmental protection. The utilisation of used products (literally, the extension of their useful life cycle) is an excellent, indirect way for companies to conform to this requirement and, at the same time, increase their profit. In this paper a mixed integer linear programming mathematical model is proposed, which can be used for the optimisation of procurement, remanufacturing, stocking and salvaging decisions. The model is flexible enough to incorporate multiple suppliers, several quality levels of returned products and multiple periods of time. The applicability of the model is demonstrated through the optimisation of alternative scenarios, the optimal solutions of which reveal the potential profitability of used products exploitation.

关键词： reverse logistics closed-loop supply chains remanufacturing mixed integer linear programming multi-period model

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