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A service level model for the control wafers safety inventory problem

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2005年第5-6期26卷 591-597页

作者： Chung, SH Kang, HY Pearn, WL Natl Chiao Tung Univ Dept Ind Engn & Management Hsinchu Taiwan

This paper considers the control wafers safety inventory problem (CWSIP) in the wafer fabrication photolithography area. The objective is to minimize the total cost of control wafers, where the cost includes new wafers cost, re-entrant cost and holding cost while maintaining the same level of production throughput. For the problem under pulling control production environment, a nonlinear programming model is presented to set safety inventory levels so as to minimize total cost of control wafers. A numerical example is given to illustrate the practicality of the model. The results demonstrate that the proposed model is an effective tool for determining the service level of safety inventory of control wafers for each grade.

关键词： control wafers nonlinear programming model pull control safety inventory service level

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Distributionally robust co-optimization of the demand-side resources and soft open points allocation for the high penetration of renewable energy

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IET RENEWABLE POWER GENERATION 2022年第4期16卷 713-725页

作者： Liu, Hong Li, Junkai Zhang, Shida Ge, Shaoyun Yang, Baijie Wang, Chengshan Tianjin Univ Minist Educ Key Lab Smart Grid Tianjin 300072 Peoples R China

The new technologies, such as soft open points (SOPs) and demand response (DR), offer original approaches to stabilize the system operation and accommodate the high penetration of distributed generators (DGs). However, the applied effects of these technologies are closely affected by the uncertainties of the consumer's willingness and the outputs of DGs. To solve the problems caused by the uncertainty of the resources in active distribution system, this paper proposes a distributionally robust co-optimization model for the demand side resources and SOPs, which realizes the combination of investment economy and operation robustness. Next, using equivalent substitution and polyhedron linearization technique, this paper proposes the mathematical method which transforms the original non-linear programming model into a mixed-integer linear programming model, and obtains the solution to the distributionally robust model with column and constraint generation (CCG) algorithm. Finally, the effectiveness of the proposed model is verified with the sample from a power distribution system in northern China. The result demonstrates that the co-optimization model can realize complementary advantages of the demand side resources and SOPs, which can not only guarantee the economy of scheme, but also improve the accommodation of DGs.

关键词： investment distributed generators power distribution system linear programming distributed power generation equivalent substitution nonlinear programming model mixed-integer linear programming model distributionally robust co-optimization model consumer nonlinear programming integer programming optimisation active distribution system SOPs demand response renewable energy investment economy soft open points allocation applied effects polyhedron linearization technique system operation distributionally robust model original approaches operation robustness

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ANALYTICAL modelING OF LAMINATED COMPOSITE PLATES USING *** CIRCUIT AND WAVE DIGITAL FILTERS

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JOURNAL OF INDUSTRIAL AND MANAGEMENT OPTIMIZATION 2020年第5期16卷 2213-2252页

作者： Tseng, Chien Hsun Kun Shan Univ Dept Informat Engn Tainan Taiwan

A physical-based numerical algorithm using Kirchhoff circuit is detailed for modelling the free vibration of moderate thick symmetrically laminated plates based on the first order shear deformation theory (FSDT). With the help of multidimensional passivity of analog circuit and nonlinear optimization solvers, the philosophy gives rise to a nonlinear programming (NLP) model that can apply further to explore stability characteristics and optimum performance of the resultant multidimensional wave digital filtering network representing the FSDT plate. Various optimization methods exploiting gradient-based and direct search methods are adopted with efficient broad search power to tackle the NLP model. As a result, the necessary Courant-Friedrichs-Levy stability criterion can be fully satisfied at all time with least restriction on the spatially discretized geometry of the scattering problem. With full stability guaranteed, the waveform is analyzed by the power cepstrum for spectra peaks detection, which has led to more accurate estimate of various vibration effects in predicting nature frequencies with different fiber orientations, stacking sequences, stiffness ratios and boundary conditions. These results have shown in excellent agreement with early published works based on the finite element solutions of the high-order shear deformation theory and other well known numerical techniques.

关键词： Laminated composite plate free vibration nonlinear programming model MDWDF network Courant-Friedrichs-Levy condition cepstrum analysis nonlinear solvers

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Water-renewable energy Nexus: Optimization of geothermal energy-powered seawater desalination systems

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RENEWABLE ENERGY 2022年 196卷 234-246页

作者： Pietrasanta, Ariana M. Mussati, Sergio F. Aguirre, Pio A. Morosuk, Tatiana Mussati, Miguel C. INGAR Inst Desarrollo & Diseno CONICET UTN Avellaneda 3657 RA-3000 Santa Fe Argentina Tech Univ Berlin Inst Energy Engn Marchstr 18 D-10587 Berlin Germany

This paper addresses the optimization of geothermal energy-powered seawater desalination systems. A nonlinear optimization mathematical model was implemented into General Algebraic modelling System (GAMS). The model embeds many candidate configurations for optimization, which result from the combination of the following subsystems: a single flash (SFGP) or double flash (DFGP) geothermal power plants, a multi-effect distillation (MED) process or a reverse osmosis (RO) system for freshwater pro-duction. Also, an energy recovery turbine (ERT) is embedded. The minimization of the total annual cost of the process represents the objective function. The proposed model is a powerful decision-making tool for selecting the optimal configuration of the integrated process, sizes, and operating conditions to meet the demands of electricity and freshwater desired by users. It was found that for fixed 70 MW electricity generation and low freshwater demands (720-2880 m(3)/h), the optimal configuration is SFGP/MED. For high freshwater demands (4320-5040 m(3)/h), the optimal configuration is DFGP/MED/RO. For inter-mediate freshwater demand (3600 m(3)/h), an optimal transition configuration is in between the two previous configurations, i.e., SFGP/MED/RO/ERT. It is highlighted that the model can be used to simulate fixed configurations if no degrees of freedom are available. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Geothermal power Desalination nonlinear programming model Parametric optimal design Superstructure optimization

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A note on fuzzy regression model with fuzzy input and output data for manpower forecasting

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FUZZY SETS AND SYSTEMS 2003年第2期138卷 301-305页

作者： Hong, DH Yi, HC Catholic Univ Daegu Sch Mech & Automot Engn Kyungbuk 712702 South Korea Yeongnam Univ Sch Mech Engn Kyongsan 712749 South Korea

Lee and Chen (Fuzzy Sets and Systems 119 (2001) 205) introduced a generalized fuzzy linear regression model and proposed a nonlinear programming model to identify the fuzzy parameters and their vagueness for the generalized regression model. In this note, we show that the proposed nonlinear programming model is invalid. (C) 2003 Elsevier B.V. All rights reserved.

关键词： fuzzy regression nonlinear programming model

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Threshold-type call admission control in wireless/mobile multimedia networks using prioritised adaptive framework

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ELECTRONICS LETTERS 2000年第9期36卷 852-854页

作者： Kwon, T Kim, S Choi, Y Naghshineh, M Seoul Natl Univ Dept Comp Engn Seoul 151742 South Korea IBM Corp Thomas J Watson Res Ctr Yorktown Heights NY 10598 USA

Limitations to the bandwidth of wireless links has motivated the development of adaptive multimedia services where the bandwidth of a call can be dynamically adjusted. A threshold-type call admission control algorithm is proposed for quality of service provisioning;a nonlinear programming model is formulated for determining the optimal threshold values.

关键词： mobile multimedia networks prioritised adaptive framework quality of service provisioning wireless multimedia networks adaptive multimedia services quality of service nonlinear programming model threshold-type call admission control nonlinear programming radio networks dynamically adjusted bandwidth QoS provision wireless links mobile radio optimal threshold values telecommunication congestion control multimedia communication

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Reforming Path of China's Fertility Policy in Stabilizing Demographic Dividends Perspective

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SOCIAL INDICATORS RESEARCH 2018年第3期137卷 1225-1243页

作者： Wu, Pengkun Wu, Chong Wu, Yuanyuan Hunan Univ Arts & Sci Hunan Prov Cooperat Innovat Ctr Construct & Dev D Changde Peoples R China Hunan Univ Arts & Sci Coll Math & Computat Sci Changde Peoples R China Harbin Inst Technol Sch Management Harbin Heilongjiang Peoples R China Hong Kong Polytech Univ Dept Management & Mkt Kowloon Hong Kong Peoples R China

The recent years witnessed a sharp drop in China's demographic dividend;therefore, some reform measures about China's fertility policy have been adopted to optimize population structures and to maintain demographic dividend. However, our simulation results reveal that the new two-child fertility policy cannot effectively deal with population ageing, and that China's fertility policy needs further adjustment. Specifically, we find that the new two-child fertility policy will deteriorate demographic dividend before 2050, through combination of simulation results and formula derivation. Aiming to stabilize demographic dividend at ideal range all the time, we build nonlinear integer programming model to propose an appropriate reforming path for China's fertility policy. Then, we simulate and compare demographic developments under the proposed reforming path with those under three possible fertility policies: one-child, two-child and no fertility restriction, verifying that the proposed reforming path has better performance on stabilizing demographic dividend than these three fertility policies have. Finally, sensitivity analysis of upper bound of research interval is conducted to evaluate the effect of the upper bound on proposed reforming path. Based on these results, we suggest that China should continue to execute current strict fertility policy before 2032, then begin to relax it gradually especially during 2036-2041, and completely cancel fertility policy after 2065.

关键词： Demographic dividend Fertility policy nonlinear programming model Reforming path Comparative analysis China

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A separable programming approach to allocating manpower for the California Highway Patrol.

A separable programming approach to allocating manpower for ...

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作者： Schneible, Daniel Carey United States Naval Postgraduate School

学位级别：硕士

This paper presents a mathematical approach to formulating a problem in the allocation of manpower for the Monterey County Area of the California Highway Patrol (CHP). The technique employed is to formulate the man- power allocation problem of the CHP as a nonlinear pro- gramming problem. The problem turns out to be separable, and the Mathematical programming System/360 for the IBM 360 computer is subsequently used. This project was undertaken with the cooperation of the CHP.

关键词： nonlinear programming model Separable programming model Manpower Allocation Manpower Assignment California Highway Patrol Accident Rate

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Dynamic active and reactive power compensation in distribution networks with batteries: A day-ahead economic dispatch approach

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COMPUTERS & ELECTRICAL ENGINEERING 2020年 85卷

作者： Danilo Montoya, Oscar Gil-Gonzalez, Walter Univ Dist Francisco Jose de Caldas Fac Ingn Carrera 7 40B-53 Bogota 11021 DC Colombia Univ Tecnol Bolivar Lab Inteligente Energia Km 1 Via Turbaco Cartagena 131001 Colombia

This paper focuses on the problems of optimal operation of battery energy storage systems (BESSs) in distributed networks from a nonlinear programming (NLP) point of view. This proposal contains the active and reactive power capabilities of the voltage source converters that interface with the BESS independently, which implies that the BESSs have the possibility to work as dynamic energy compensators over all the four quadrants. Two radial distribution networks have been used to validate the proposed NLP model. This model has been arrived at by using the general algebraic modeling system (GAMS) optimization package. Artificial neural networks (ANN) are also employed for short-term forecasting of renewable generation based on wind and photo-voltaic sources. Numerical results show that the inclusion of reactive power capabilities of batteries reduces the daily operational cost of the network as compared to the classical unity power factor operation approach. All the simulations are made considering Colombian utility typical curves. (c) 2020 Elsevier Ltd. All rights reserved.

关键词： Battery energy storage system Day-ahead economic dispatch Distribution networks Dynamic active and reactive power compensation nonlinear programming model

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Fabrication of Wood Fiber-rubber Composites with Reclaimed Rubber

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BIORESOURCES 2018年第2期13卷 3300-3314页

作者： Shao, Dongwei Xu, Min Cai, Liping Shi, Sheldon Q. Northeast Forestry Univ Key Lab Biobased Mat Sci & Technol Minist Educ Harbin 150040 Heilongjiang Peoples R China Jiamusi Univ Coll Mech Engn Jiamusi Peoples R China Univ North Texas Mech & Energy Engn Dept Denton TX 76201 USA

This research investigated the use of reclaimed rubber (RR) from waste tires to partially replace the rubber compound (RC) when making wood fiber-rubber composites (WRCs). Ninety panels of WRC containing RR were manufactured with RR contents of 0% to 40%, mixing times of 6 min to 14 min, and vulcanizing temperatures of 150 degrees C to 170 degrees C. There were three steps, which were the fiber-rubber mixing, tabletting, and vulcanization molding processes. Four regression equations for the tensile strength, elongation at break, hardness, and rebound resilience as functions of the RR content, mixing time, and vulcanizing temperature were derived, and a nonlinear programming model was developed to obtain the optimum panel properties. It was found that when the RR content was within 20%, the wood fibers were well encapsulated and embedded in the RC/RR blends, and the processability of the WRCs were improved by adding RR. The incorporation of RR into the WRCs increased the average tensile strength and hardness by 33.9% and 2.3%, respectively, while the swelling ratio in toluene and 24-h water absorption were reduced by 13% and 42%, respectively.

关键词： Wood rubber composites (WRCs) Reclaimed rubber (RR) Panel properties nonlinear programming model

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