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The block planning approach for continuous time-based dynamic lot sizing and scheduling

Business Research 2014年第1期7卷 51-76页

作者： Günther, Hans-Otto Department of Industrial Engineering Seoul National University Seoul 151-744 South Korea

This paper calls for a change in paradigm in lot sizing and scheduling. Traditionally, a discrete time scale is chosen to model lot sizing and scheduling. As an alternative, the so-called block planning concept is proposed which is based on a continuous representation of time. A mixed-integer linear optimization model is presented that determines the size and the time phasing of the individual production lots in a single-stage production system under the objective of minimizing the makespan. The modelling approach presented here assumes the grouping of product variants into setup families and the production of product variants within a family in a pre-defined sequence. Numerical results demonstrate the practicability of this approach under experimental conditions which reflect typical settings from a leading company in the European beverage industry. © 2014, The Author(s).

关键词： Block planning Lot sizing and scheduling mixed-integer linear programming

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Reliable capacity planning despite uncertain disassembly, regeneration and reassembly workloads by using statistical and mathematical approaches - Validation in subsidiaries of a global MRO company with operations in Asia, Europe and North America 5th

Reliable capacity planning despite uncertain disassembly, re...

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5th CIRP Conference on Assembly Technologies and Systems (CATS)

作者： Eickemeyer, Steffen C. Steinkamp, Simon Schuster, Bernhardt Bodenhage, Frank Nyhuis, Peter Univ Hannover Prod Engn Ctr Hannover PZH Inst Prod Syst & Logist IFA Prod Management Res Grp D-30824 Garbsen Germany Univ Hannover Prod Engn Ctr Hannover PZH Inst Prod Syst & Logist IFA D-30824 Garbsen Germany MTU Maintenance Canada Ltd Engn & Tech Support Richmond BC V7B 1B4 Canada MTU Maintenance Zhuhai Co Ltd Zhuhai 519030 Peoples R China Univ Hannover Inst Prod Syst & Logist IFA D-30824 Garbsen Germany Inst Integrierte Prod Hannover gGmbH D-30824 Garbsen Germany

The MRO industry faces substantial challenges with regard to the capacity planning of disassembly and reassembly work. This is due to the unknown workloads when regenerating complex investment goods and is caused, in particular, by the uncertain degree of disassembly and the complex challenges of reassembly. Forecasting techniques based on Bayesian networks are developed along with mathematical models which optimize capacity utilization, job order and the resulting costs. The approaches are tested and validated in conjunction with an MRO company with global operations. The results show possibilities for enhancing the planning processes and are found to be transferable on an international scale regardless of sociocultural and process differences. (C) 2014 Published by Elsevier B.V.

关键词： Bayesian networks capacity planning complex capital goods damage library data mining disassembly forecast maintenance mixed-integer linear programming MRO reassembly regeneration

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Energy Management of a Multi-Agent Based Multi-Microgrid System 6

Energy Management of a Multi-Agent Based Multi-Microgrid Sys...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (IEEE PES APPEEC)

作者： Ren, J. S. Tan, K. T. Sivaneasan, B. So, P. L. Gunawan, E. Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore

ISBN: (纸本)9781479975372

This paper presents a model-based optimization algorithm for short-term energy trading in a multi-microgrid system. The multi-microgrid system has a hierarchical design architecture which is based on the Multi-Agent System (MAS) concept. mixed-integer linear programming (MILP) which takes into consideration multiple constraints is used to obtain the optimum amount of power that will be generated, sold, or stored for the Energy Management System (EMS) of the multi-microgrid system at different time intervals. By using the proposed optimization algorithm, the EMS will ensure that power balance in the multi-microgrid system is achieved through energy trading between different interconnecting microgrids. The proposed optimization algorithm and hierarchical multi-microgrid system design architecture have the capability to ensure that the multi-microgrid system operates in a coordinated and economic manner. The design concept is demonstrated through different test case scenarios and the results obtained are discussed.

关键词： Hierarchical architecture energy management multi-agent system multi-microgrid mixed-integer linear programming

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Automatic Security Evaluation of Block Ciphers with S-bP Structures Against Related-Key Differential Attacks 9

Automatic Security Evaluation of Block Ciphers with S-bP Str...

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9th China International Conference on Information Security and Cryptology (Inscrypt)

作者： Sun, Siwei Hu, Lei Song, Ling Xie, Yonghong Wang, Peng Chinese Acad Sci Inst Informat Engn State Key Lab Informat Secur Beijing 100093 Peoples R China

ISBN: (纸本)9783319120874;9783319120867

Counting the number of active S-boxes is a common way to evaluate the security of symmetric key cryptographic schemes against differential attack. Based on mixed integer linear programming (MILP), Mouha et al. proposed a method to accomplish this task automatically for word-oriented symmetric-key ciphers with SPN structures. However, this method can not be applied directly to block ciphers of SPN structures with bitwise permutation diffusion layers (S-bP structures), due to its ignorance of the diffusion effect derived collaboratively by nonlinear substitution layers and bitwise permutation layers. In this paper we extend Mouha et al.'s method for S-bP structures by introducing new representations for exclusive-or (XOR) differences to describe bit/word level differences simultaneously and by taking the collaborative diffusion effect of S-boxes and bitwise permutations into account. Our method is applied to the block cipher PRESENT-80, an international standard for lightweight symmetric key cryptography, to automatically evaluate its security against differential attacks. We obtain lower bounds on the numbers of active S-boxes in the single-key model for full 31-round PRESENT-80 and in related-key model for round-reduced PRESENT-80 up to 12 rounds, and therefore automatically prove that the full-round PRESENT-80 is secure against single-key differential attack, and the cost of related-key differential attack on the full-round PRESENT-80 is close to that of an exhaustive search: the best related-key differential characteristic for full PRESENT-80 is upper bounded by 2(-72).

关键词： Block cipher SPN structure Differential attack Active S-box mixed-integer linear programming

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Extreme Nash Equilibrium of Poly matrix Games in Electricity Market

Extreme Nash Equilibrium of Poly matrix Games in Electricity...

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IEEE International Conference on Recent Advances and Innovations in Engineering (ICRAIE)

作者： Sharma, Kailash Chand Bhakar, Rohit Tiwari, Harpal Malaviya Natl Inst Technol Dept Elect Engn Jaipur Rajasthan India Univ Bath Fac Engn & Design Bath Avon England

ISBN: (纸本)9781479940400

Game theoretical approaches are widely used for the analysis of oligopolistic electricity markets. Nash equilibrium is a solution concept of game theoretical approaches. Due to existence of mixed strategy equilibrium and large number of multiple players, finding Nash equilibrium for problems in electricity market is a difficult task. To resolve these difficulties, this paper proposes a simplified approach for finding extreme Nash equilibrium, based on payoff matrix approach and mixed integer linear programming (MILP). To illustrate the proposed approach, a practical case study of Cournot poly-matrix game is considered. Eliminating constraints are appended on the proposed approach to find a global optimal solution. Obtained results show the strength of proposed approach, in terms of simplicity and computational time.

关键词： Electricity market poly-matrix game Nash equilibrium payoff matrix approach mixed-integer linear programming

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Mathematical programming formulations for the optimal placement of imperfect detectors with applications to flammable gas detection and mitigation systems

Mathematical programming formulations for the optimal placem...

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作者： Benavides Serrano, Alberto Jose Texas A&M University

学位级别：Ph.D.

The placement of detectors in mitigation systems is a difficult problem usually addressed in the industry via qualitative and semiquantative approaches. Simplifications are used to circumvent difficulties regarding problem size, parameter uncertainty, and lack of information concerning leak development. Given recent improvement of consequence modeling tools, the use of a stochastic mixed-integer linear programming (MILP) formulation (SP) was previously proposed to quantitatively approach this problem. This formulation minimizes the expected damage over a large set of gas leak scenarios while assuming perfect detectors. In reality gas detectors are prone to false positives and false negatives. Two solutions are usually implemented in the process industries. First, additional confirmation from several detectors (i.e., voting) is required before emergency actions are triggered in order to avoid false positives. Second, in order to avoid false negatives, the unavailability of the detectors is considered in the placement strategy. Unavailability corresponds to the probability that the detector will not be able to perform its intended function when required. In the first part of this dissertation, two problem formulations were developed and validated to address the issue of imperfect detectors: minimization of expected damage considering unavailability (SP-U) and minimization of the expected damage considering unavailability and voting (SP-UV). SP-U and SP-UV placement results were compared with those obtained assuming perfect detectors. Results demonstrate that explicit consideration of unavailability and voting effects alters the final detector placement. Quantitative risk can be significantly higher if we neglect these issues when solving for the optimal placement. Furthermore, SP-UV placement results were compared with those of four existing approaches for gas detector placement using three different performance metrics in accordance to the objectives of gas detection

关键词： Gas Detection Process Safety Detector Placement Stochastic programming mixed-integer linear programming mixed-integer Nonlinear programming Unavailability Reliability Backup Coverage Voting Thesis

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Automatic Security Evaluation and (Related-key) Differential Characteristic Search: Application to SIMON, PRESENT, LBlock, DES(L) and Other Bit-Oriented Block Ciphers 1

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20th Annual International Conference on the Theory and Application of Cryptology and Information Security (Asiacrypt)

作者： Sun, Siwei Hu, Lei Wang, Peng Qiao, Kexin Ma, Xiaoshuang Song, Ling Chinese Acad Sci Inst Informat Engn State Key Lab Informat Secur Beijing 100093 Peoples R China Chinese Acad Sci Data Assurance & Commun Secur Res Ctr Beijing 100093 Peoples R China

ISBN: (数字)9783662456118

ISBN: (纸本)9783662456118;9783662456101

We propose two systematic methods to describe the differential property of an S-box with linear inequalities based on logical condition modelling and computational geometry respectively. In one method, inequalities are generated according to some conditional differential properties of the S-box;in the other method, inequalities are extracted from the H-representation of the convex hull of all possible differential patterns of the S-box. For the second method, we develop a greedy algorithm for selecting a given number of inequalities from the convex hull. Using these inequalities combined with mixed-integer linear programming (MILP) technique, we propose an automatic method for evaluating the security of bit-oriented block ciphers against the (related-key) differential attack with several techniques for obtaining tighter security bounds, and a new tool for finding (related-key) differential characteristics automatically for bit-oriented block ciphers.

关键词： Automatic cryptanalysis Related-key differential attack mixed-integer linear programming Convex hull

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Multiobjective MILP Model for Optimal Allocation of Automated Switching Devices in Electric Power Distribution Systems

Multiobjective MILP Model for Optimal Allocation of Automate...

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IEEE Eindhoven PowerTech Conference

作者： Gustavo D. Ferreira Daniel S. Gazzana Arturo S. Bretas Arlan L. Bettiol Antonio Carniato Luis F. do N. Passos Rafael Z. Homma Fernando H. Molina Department of Electrical Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil Neo Domino Consulting and Research Florianópolis Brazil Centrais Elétricas de Santa Catarina S.A Florianópolis Brazil

This paper presents an analytical mixed-integer linear programming model to improve reliability of distribution networks through the optimal allocation of automated switching devices. Optimal reliability is formulated as a multi-objective problem of minimizing customers' interruptions and the investment costs related to devices' acquisition, relocation and operation. In order to establish the optimal trade-off between these conflicting objectives the Goal programming approach is proposed. The presented model considers post-fault restoration constraints which limit load transfers and thereby the system reconfiguration capability. Restoration feasibility is ensured by a linear formulation of power flow equations as functions of geographical locations of automated switching devices in the feeder. Therefore, the model's solutions provide a more effective and economic application of automated switching devices, so that voltage and system capacity constraints are taken into account in selecting optimal locations of devices. The proposed methodology was validated using the IEEE 123-bus test feeder.

关键词： Allocation of automated switching devices Distribution systems reliability Load restoration mixed-integer linear programming

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Distribution Network Reconfiguration under Modeling of AC Optimal Power Flow Equations: A mixed-integer programming Approach

Distribution Network Reconfiguration under Modeling of AC Op...

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IEEE PES 2nd Latin American Conference on Innovative Smart Grid Technologies (ISGT Latin America)

作者： Ferreira, R. S. Borges, C. L. T. Pereira, M. V. F. PSR Rio De Janeiro RJ Brazil

ISBN: (纸本)9781467352741;9781467352727

One of the most common applications of the AC optimal power flow (ACOPF) in distribution systems is the network reconfiguration problem, which consists of altering the topology of the network in order to optimize a given objective function - usually, minimizing ohmic losses. We propose a mixed-integer linear programming reformulation of the network reconfiguration problem for distribution systems, under full modeling of the ACOPF equations. The proposed formulation captures the non-linear behavior of the electrical network via approximations of arbitrary accuracy, allows the representation of discrete decisions via integer decision variables, and can be solved to global optimality with commercially available optimization solvers. The applicability of the proposed formulation is indicated with help of case studies.

关键词： Distribution systems network reconfiguration AC optimal power flow mixed-integer linear programming

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Reliable Capacity Planning Despite Uncertain Disassembly, Regeneration and Reassembly Workloads by Using Statistical and Mathematical Approaches – Validation in Subsidiaries of a Global MRO Company with Operations in Asia, Europe and North America

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Procedia CIRP 2014年 23卷 252-257页

作者： Steffen C. Eickemeyer Simon Steinkamp Bernhardt Schuster Frank Bodenhage Peter Nyhuis Scientific assistant in Production Management Research Group Institute of Production Systems & Logistics (IFA) Production Engineering Centre Hannover (PZH) Leibniz University Hannover An der Universität 2 30824 Garbsen Germany Temporary scientific assistant at Institute of Production Systems & Logisitcs (IFA) Production Engineering Centre Hannover (PZH) Leibniz University Hannover An der Universität 2 30824 Garbsen Germany Director of Engineering & Technical Support at MTU Maintenance Canada Ltd. 6020 Russ Baker Way Richmond BC V7B 1B4 Canada President & CEO of MTU Maintenance Zhuhai Co. Ltd. No. 1 Tianke Road Free Trade Zone Zhuhai 519030 P.R. China Head of Institute of Production Systems & Logisitcs (IFA) Leibniz University Hannover and managing director of Institut für Integrierte Produktion Hannover gGmbH An der Universität 2 30824 Garbsen Germany

关键词： Bayesian networks capacity planning complex capital goods damage library data mining disassembly forecast maintenance mixed-integer linear programming MRO reassembly regeneration

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