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A case study on sample average approximation method for stochastic supply chain network design problem

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Frontiers of Engineering Management 2017年第3期4卷 338-347页

作者： Yuan WANG Ruyan SHOU Loo Hay LEE ek peng chew Department of Industrial Systems Engineering & Management National University of Singapore

This study aims to solve a typical long-term strategic decision problem on supply chain network design with consideration to uncertain demands. Existing methods for these problems are either deterministic or limited in scale. We analyze the impact of uncertainty on demand based on actual large data from industrial *** equivalent model with nonanticipativity constraints, branch-and-fix coordination, sample average approximation(SAA) with Bayesian bootstrap, and Latin hypercube sampling were adopted to analyze stochastic demands. A computational study of supply chain network with front-ends in Europe and back-ends in Asia is presented to highlight the importance of stochastic factors in these problems and the efficiency of our proposed solution approach.

关键词： supply chain network stochastic demand sampling average approximation Bayesian bootstrap Latin hypercube sampling

Connecting the Belt and Road through sea-rail collaboration

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Frontiers of Engineering Management 2017年第3期4卷 315-324页

作者： Chenhao ZHOU Haobin LI Wencheng WANG Loo Hay LEE ek peng chew Industrial Systems Engineering and Management National University of Singapore School of Management Shanghai University

As part of China's "the Belt and Road"strategy, China Railway Express provides alternative shipping routes and transportation modes from Asia to Europe and creates new opportunities for intermodal transportation in the shipping industry. A time–distancebased cost(time cost) function was proposed to compare China Railway Express with traditional transportation modes. Time cost was related to different types of cargoes,which exhibit distinct sensitivity to time. Using the proposed cost function as basis, we identified the cost indifference area where total costs are equal. Further analysis was performed for selecting the transportation mode and supply area for a specific cargo. This study provides various parties, such as business owners, the government, and the shipping industry, with many valuable insights.

关键词： China Railway Express the Belt and Road shipping industry combined transportation

Review on laser directed energy deposited aluminum alloys

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International Journal of Extreme Manufacturing 2024年第2期6卷 84-131页

作者： Tian-Shu Liu peng Chen Feng Qiu Hong-Yu Yang Nicholas Tan Yew Jin Youxiang chew Di Wang Ruidi Li Qi-Chuan Jiang Chaolin Tan Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025People’s Republic of China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025People’s Republic of China School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China

Lightweight aluminum(Al)alloys have been widely used in frontier fields like aerospace and automotive industries,which attracts great interest in additive manufacturing(AM)to process high-value Al *** a mainstream AM technique,laser-directed energy deposition(LDED)shows good scalability to meet the requirements for large-format component manufacturing and ***,LDED Al alloys are highly challenging due to their inherent poor printability(*** laser absorption,high oxidation sensitivity and cracking tendency).To further promote the development of LDED high-performance Al alloys,this review offers a deep understanding of the challenges and strategies to improve printability in LDED Al *** porosity,cracking,distortion,inclusions,element evaporation and resultant inferior mechanical properties(worse than laser powder bed fusion)are the key challenges in LDED Al *** parameter optimizations,in-situ alloy design,reinforcing particle addition and field assistance are the efficient approaches to improving the printability and performance of LDED Al *** underlying correlations between processes,alloy innovation,characteristic microstructures,and achievable performances in LDED Al alloys are *** benchmark mechanical properties and primary strengthening mechanism of LDED Al alloys are *** review aims to provide a critical and in-depth evaluation of current progress in LDED Al *** opportunities and perspectives in LDED high-performance Al alloys are also outlined.

关键词： additive manufacturing laser directed energy deposition(LDED) aluminum alloys printability aluminum matrix composite auxiliary fields mechanical properties

Steady formation analysis onmulti-robot systems

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Journal of Control and Decision 2017年第1期4卷 12-31页

作者： Yutong Liu Hongjun Yu Cheng-chew Lim peng Shi School of Electrical and Electronic Engineering University of AdelaideAdelaideAustralia

In this paper,a controller is designed for a group of cooperative robots to achieve the stable *** network among the robots is assumed unavailable and each robot can only measure the displacements relative to their *** controller will enable the robots to move to a predefined formation or a special formation under a suitable protocol which we will *** will discuss the effect of different sizes of the multi-vehicle system and conduct simulations to verify the effectiveness of the proposed controller and the formation protocols.

关键词： Formation control limited sensing range controller design size of multi-vehicle system

Three-Dimensional Lattice Kinetic Scheme and its Application to Simulate Incompressible Viscous Thermal Flows

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Communications in Computational Physics 2007年第2期2卷 239-254页

作者： Y.peng C.Shu Y.T.chew Department of Mechanical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260.

In this paper,the three-dimensional lattice kinetic scheme is presented to simulate incompressible viscous thermal *** compared with the standard LBM,the present scheme has the following good *** can save the computer memory since there is no need to store the density *** the conventional NS solvers,the implementation of boundary conditions is straightforward since the dependent variables are the macroscopic flow *** easy implementation of boundary conditions is a good property for solving three-dimensional flow *** present scheme is validated by simulating the three-dimensional natural convection in an air-filled cubical enclosure,which is heated differentially at two vertical side *** obtained numerical results compare very well with available data in the literature.

关键词： Lattice kinetic scheme lattice Boltzmann method three-dimensional incompressible flow natural convection thermal flow.

Synthesis of novel magneto-hybrid polyoxometalate composite membrane with simultaneous photocatalytic self-cleaning and antifouling functionalities

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1450-1459页

作者： Nee Nee Tan Qi Hwa Ng Siti Kartini Enche Ab Rahim Abdul Latif Ahmad peng Yong Hoo Thiam Leng chew Faculty of Chemical Engineering&Technology Universiti Malaysia Perlis(UniMAP)Perlis 02600Malaysia Centre of Excellent for Frontier Materials Research Universiti Malaysia Perlis(UniMAP)Perlis 02600Malaysia School of Chemical Engineering Engineering CampusUniversiti Sains MalaysiaPenang 14300Malaysia Department of Chemical Engineering Faculty of EngineeringUniversiti Teknologi PETRONASPerak 32610Malaysia CO_(2) Research Centre(CO2RES) Institute of Contaminant ManagementUniversiti Teknologi PETRONASPerak 32610Malaysia

Membrane technology is ideal for removing aqueous humic acid,but humic acid deposits cause membrane fouling,a significant challenge that limits its ***,this work proposed an alternative approach to the controllably magnetically induced magnetohybrid polyoxometalate(magneto-HPOM)nanocomposite migration toward the polyethersulfone(PES)membrane surface under a magnetic field to enhance the self-cleaning and antifouling functionalities of the *** incorporating magneto-HPOM nanocomposite into the PES casting solution,functionalized magnetite nanoparticles(F-MNP)were first coated with HPOM photocatalyst to fabricate a magneto-HPOM-PES *** was shown that the apparent impacts of this novel magneto-HPOM-PES membrane on the hydrophilic behavior and photocatalytic properties of the magneto-HPOM nanocomposite improve the hydrophilicity,separation performance,antifouling and self-cleaning properties of the membrane compared with neat PES ***,after exposure to ultraviolet light,the magneto-HPOM-PES membrane can be recovered after three cycles with a flux recovery ratio of 107.95%,100.06%,and 95.56%,which is attributed to the temporal super hydrophilicity ***,the magneto-HPOM-PES membrane could efficiently maintain 100%humic acid rejection for the first and second cycles and 99.81%for the third *** study revealed a novel approach to fabricating membranes with high antifouling and self-cleaning properties for water treatment.

关键词： magneto-hybrid polyoxometalate nanocomposite composite membrane antifouling self-cleaning magnetic and photocatalytic responsiveness

电动联合渗透反应屏障修复污染土壤的研究进展

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安全与环境学报 2024年第1期24卷 330-344页

作者：王艳薛逸翔朱鹏宁波大学土木工程系浙江宁波315211

电动治理技术具有治理时间短、成本低、效率高、处理对象广和不破坏土壤结构等优点,是一种前景广阔的土壤原位治理技术,可通过与其他技术相结合的方式来提高土壤中污染物的去除效率。渗透反应屏障(Permeable Reactive Barrier, PRB)技... 详细信息

电动治理技术具有治理时间短、成本低、效率高、处理对象广和不破坏土壤结构等优点,是一种前景广阔的土壤原位治理技术,可通过与其他技术相结合的方式来提高土壤中污染物的去除效率。渗透反应屏障(Permeable Reactive Barrier, PRB)技术可通过吸附、沉淀、氧化还原反应和生物降解等方式针对性地去除土壤和地下水中的污染物。电动联合渗透反应屏障(Electrokinetics Coupled with Permeable Reactive Barrier, ek-PRB)治理技术结合了电动治理技术和渗透反应屏障两种方法的优势,可更高效地治理污染土壤。通过阐述ek-PRB技术的治理原理,探讨治理过程中的各种影响因素,阐明了ek-PRB技术在(类)重金属、无机盐、放射性元素等无机污染土壤和菲、醚、柴油等有机污染土壤中的应用和实践,进而总结了ek-PRB技术的发展现状,并展望了ek-PRB技术治理污染土壤的发展趋势。

关键词：环境工程电动渗透反应屏障污染土治理

THE HENSTOCK-WIENER INTEGRAL

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Journal of Mathematical Study 1994年第1期 60-65页

作者： chew Tuan-Seng Lee peng-Yee(National University of Singapore)

ＴＨＥＨＥＮＳＴＯＣＫ－ＷＩＥＮＥＲＩＮＴＥＧＲＡＬ￥ＣｈｅｗＴｕａｎ－Ｓｅｎｇ；ＬｅｅＰｅｎｇ－Ｙｅｅ（ＮａｔｉｏｎａｌＵｎｉｖｅｒｓｉｔｙｏｆＳｉｎｇａｐｏｒｅ）Ａｂｓｔｒａｃｔ：ｗｅｉｎｔｒｏｄｕｃｅｔｈｅＨｅ... 详细信息

ＴＨＥＨＥＮＳＴＯＣＫ－ＷＩＥＮＥＲＩＮＴＥＧＲＡＬ￥ＣｈｅｗＴｕａｎ－Ｓｅｎｇ；ＬｅｅＰｅｎｇ－Ｙｅｅ（ＮａｔｉｏｎａｌＵｎｉｖｅｒｓｉｔｙｏｆＳｉｎｇａｐｏｒｅ）Ａｂｓｔｒａｃｔ：ｗｅｉｎｔｒｏｄｕｃｅｔｈｅＨｅｎｓｔｏｏｋ－ｗｉｅｎｅｒｉｎｔｅ...

关键词： Division Riemann sums Wiener measure Wiener integral HenstockWiener integral.

Unbalanced graph cuts with minimum capacity

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Frontiers of Computer Science 2014年第4期8卷 676-683页

作者： peng ZHANG School of Computer Science and Technology Shandong University Jinan 250101 China

We systematically investigate minimum capacity unbalanced cut problems arising in social networks. Let k be an input parameter. A cut （A, B） is unbalanced if the size of its smaller side is at most k （called k-size） or exactly k （called ek-size）. An s-t cut （A, B） is unbalanced if its s-side is either k-size or ek-size. In the min k-size cut （s-t cut, resp.） problem, we want to find a k-size cut （s-t cut, resp.） with the minimum capacity. The corresponding min ek-size cut （and s-t cut） problem is defined in a similar way. While the classical min s-t cut problem has been studied extensively, the minimum capacity unbalanced cut problem has only re- cently attracted the attention of researchers. In this paper, we prove that the min k-size s-t cut problem is NP-hard, and give O（log n）-approximation algorithms for the min k-size s-t cut problem, the min ek-size s-t cut problem, and the min eksize cut problem. These results, together with previous results, complete our research into minimum capacity unbalanced cut problems.

关键词： unbalanced cut min cut approximation algorithm social network combinatorial optimization