Operations Research, Systems Engineering and Industrial Engineering Commons^™

Attribute Reduction Algorithm On Balancing Profit And Risk, Dexing Wang, Jielong Xu, Hongchun Yuan

Journal of System Simulation

Abstract: Usually it is taken for granted to achieve the maximal profit at the cost of the minimal risk. It is an important problem of how to balance profit and risk, considering introducing profit and risk to attribute reduction so as to find practical algorithms in decision-making process. A decision-theoretic model was built, which could balance profit and risk combining with decision-theoretic rough set model and minimum risk of Bayes decision and find optimal combinations of risk in a certain level of expected profit, then a heuristic algorithm of attribute reduction was proposed, which took the function of balancing …

Research Progress On War Complex System Of Systems Modeling Based On Complex Network, Ma Li, Mingzhi Zhang

Journal of System Simulation

Abstract: The crucial issue of war complex system of systems (SoS) modeling is to represent the complex coupling and interaction among components of SoS based on networks. The complex network provides new means of SoS modeling. The Characteristics of complex network suitable to SoS modeling were introduced, and two kinds of general method for SOS modeling based on complex network were summed up. The research progress on operational SoS modeling was elaborated from the four aspects of networked description of SoS, modeling algorithm of SoS network, evaluation for SoS based on complex network and the combination of complex network and …

Modelingrandom Kelvin Cell Micro-Structure For Open-Cell Foam And Its Application On Compression Response Of Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao

Journal of System Simulation

Abstract: It is very difficult to model an applicable microstructure for the open cell foams. Using the Python scripting language and the commercial code ABAQUS, the structures for regular Kelvin cell, regular Kelvin open cell foams and random Kelvin open cell foams were designed and modeled automatically. The methodology for modeling, the design and implement for the key algorithms in the process of modeling were presented. For the open cell Aluminum foam, the regular Kelvin cell open cell model and the random Kelvin cell open cell foams model were developed, respectively, and the mechanical responses of them under quasi-static …

Study On Personalized Data Driven Method Of Surface Of 3d Liver Models, Guodong Chen, Jiexiong Wang, Chen Yi

Journal of System Simulation

Abstract: The personalization of 3D liver models and the acquisition of liver models with high precision are two key technologies in virtual surgery systems. A personalized data-driven method aiming at the problems of time efficiency and precision of liver models was proposed. The liver model with high precision from previous research achievements and personal CT datasets were processed respectively, and then some feature points were marked on both the model and the CT datasets. The PCA algorithm was used to get the initial matching, the ICP algorithm was used to get the matching of the feature points, and then an …

Design Of Micro-Strip Antenna Based On Step-Like Electromagnetic Band-Gap Structure To Improve Bandwidth And Gain, Zhigang Xiao, Jiang Yao, Shaoquan Yin

Journal of System Simulation

Abstract: Design of a micro-strip antenna based on electromagnetic band-gap structure can significantly improve the bandwidth and gain of the antenna. EBG structure is used to suppress the surface wave propagation and increase the radiation gain of the antenna. At the same time, the antenna substrate thickness increase is beneficial to expand the bandwidth of the antenna. According to the actual need, the EBG and the antenna can use diffident substrate. The method can replace the traditional choke ring antenna and significantly reduce the antenna size without sacrificing the performance of the antenna.

Feature Point Positioning And Modeling Approach For Human Body Based On Improved Asm, Xinjuan Zhu, Xiaoya Xiong

Journal of System Simulation

Abstract: Traditional Procrustes normalization needs many iterations which will spend a lot of time. Here training samples alignment was set only after once translation, rotation and scaling operations by marking anchor point and using average body shape as the initialization rules model. Traditional ASM algorithm leads to a long computing time and is easily to make the feature points matching error for gray model’s similarity. It was improved by using every feature points as a center point, training gray model though its rounded rectangular gray distribution, and searching target points within its 24 neighborhood points. Experimental results show …

From Sse To Opencl: Comparison Of Parallel Algorithms For Skeletal Animation On Multi-Core Cpus, Shousheng Liu, Chen Ge, Chunyong Ma, Han Yong

Journal of System Simulation

Abstract: While skeletal animations consist of high fidelity mesh and complex vertex binding, there is a huge performance bottleneck. Previous studies used GPUs to accelerate animation, but the general purpose computing performance of cheap GPUs was lower than high end CPUs. In order to explore the performance for multi-core CPUs to make up the shortfall of cheap GPUs for general purpose computing, the latest parallel scheme based on OpenCL which integrated the former two levels of parallelization was proposed, comparing to the traditional parallel scheme formed by SSE and OpenMP oriented to instruction parallelization and thread parallelization separately. The experimental …

Fractional Order Internal Model Control Of Pmsm Speed Servo System, Zhicheng Zhao, Sang Hai, Jinggang Zhang

Journal of System Simulation

Abstract: A design method of fractional order (FO) internal model controller for permanent magnet synchronous motor (PMSM) speed servo system was proposed. The simplified mathematical model of speed servo system was built. Based on internal model control (IMC) principle, the FO internal model controller was deduced by using the FO filter to replace the integer order one. The proposed controller contained only two adjustable parameters, and the defects of the fractional PI^λD^μ controller tuning method were effectively overcome. Moreover, the dominant pole was selected according to the time domain performance indicators of the system, and an analytical …

Gpu-Accelerated Simulation For Class Of Multi-Agent Based Models, Zhao Yuan, Jiachang Cheng, Wang Lu, Yueming Hu

Journal of System Simulation

Abstract: A parallel agent-based model of Von Thünen Model was proposed driven by graphics processing units (GPUs). The Von Thünen Model often involved the simulation of large numbers of geographically located individual decision-makers and a massive number of individual-level interactions. This simulation required substantial computational power. GPU-enabled computing resources provided a massively parallel processing platform based on a fine-grained shared memory paradigm. This massively parallel processing platform held considerable promise for meeting the computing requirement of agent-based models of spatial problems. A dynamic relationship table rebuilding method was proposed to enable the use of GPUs for parallel agent-based modeling of …

Non-Uniform Axial Force Precise Modeling And Simulation Of Recycled Aggregate Concrete Confined By Steel Tube Column, Wenxian Feng, Yunchao Tang, Zhang Ye, Cai Yang, Dingjing Bao, Jinmu Hu

Journal of System Simulation

Abstract: According to the complexity of non-uniform axial force on recycled aggregate concrete confined by steel tube column, precise modeling and simulation on non-uniform axial force were put forward, mechanic properties of axial force under uniform and non-uniform conditions were analyzed, and its three-dimensional model and force model were established. Then impact of load capacity was analyzed, such as geometric diameter, loading condition, and deformation during production. Force simulation and experimental results fit relatively well. It turned out that uniform axial load capacity was greater than concentrated eccentric axial load capacity. Besides, eccentric axial load capacity was related to eccentricity. …

Simulation Of Grid-Connected Solar Micro-Inverter Based On Fuzzy Pi Controller And Feed-Forward Compensation, Weiliang Liu, Changliang Liu, Huichao Zhang, Yongjun Lin, Liangyu Ma

Journal of System Simulation

Abstract: Grid-connected solar micro-inverter is a highly nonlinear and time-varying system, so it is difficult to achieve good control effect using traditional PI controller. Small signal analysis model of micro-inverter was established, grid-connected current control strategy composed of fuzzy PI controller and grid voltage feed-forward was put forward, and the initial parameters of PI controller was optimized using the genetic algorithm. Simulation results show that the control strategy has the virtues of good robustness, small dynamic deviation, and could reduce the harmonic content of grid-connected current.

Simulation On Superframe Transmission Mechanism In Wireless Sensor Networks, Hairong Yan, Yufei Wei, Zhang Yan, Xie Yue, He Kai

Journal of System Simulation

Abstract: At present, studies on real-time performance and reliability of WSN are mostly based on the performance analysis, protocol optimization or mathematical modeling with IEEE 802.15.4 standard MAC Protocol. However, there is no concern about the large impact on the network real-time and reliability caused by duration of the competitive access control phase (CAP) and non-competitive access control stage (CFP) in the IEEE 802.15.4 standard superframe structure. To solve these problems, a MAC layer superframe mechanism simulation algorithm was designed and implemented to simulate the IEEE802.15.4 standard MAC-layer superframe mechanism by establishing a state machine model. This design also built …

Immediate Effects Of Dynamic Lycra® Orthosis On Sitting To Standing Ability Children With Cerebral Palsy / Ida Hasni Shaari, Ida Hasn Shaari

Student Works (2020-2029)

Children with Cerebral Palsy (CP) are highly exposed to postural mal-alignment which interrupt their functional movement pattern and the ability to attain certain functional activities, like walking and Children with Cerebral Palsy (CP) are highly exposed to postural mal-alignment which interrupt their functional movement pattern and the ability to attain certain functional activities, like walking and sitting-to-standing motion (STS). Orthoses are commonly prescribed to give good posture in these children. Yet, none of the orthoses has been found to be suitable in addressing trunkpelvis alignment in children with cerebral palsy, to enhance their STS performance. Therefore, this study was conducted …

Fault Diagnosis Of Reverse Osmosis Water Desalination Based On Optimized Support Vector Machine, Zhang Biao, Jianfeng Xing, Zhicheng Ji

Journal of System Simulation

Abstract: According to the reverse osmosis membrane fault problems in reverse osmosis water desalination system, a fault diagnosis method based on support vector machine (SVM) was introduced for fault diagnoses. To solve the problem of parameter optimization in SVM, an improved chaos particle swarm algorithm was proposed. The introduction of Chaos theory to particle swarm optimization algorithm may not only enhance the diversity of the population and particle global search ability, but also improve the convergence speed and accuracy of the particle swarm algorithm. The optimized SVM model was applied to the fault diagnosis of reverse osmosis water desalination system. …

Research On Modelica-Based Training Simulation System Of Tamper Operations, Xiaobo Peng, Cheng Tao, Feng Ping, Jianming Du

Journal of System Simulation

Abstract: Tamping operations are trivial and must comply with operation specifications, which requires the training simulation system of tamper operations (TSSTO) have ability to manage its operation process. For this requirement, a TSSTO based on Modelica was developed. The multi-domain physical model of the tamper system, which is responsible for the simulation calculation of the system, was constructed by Modelica. The status model, which manages the operation process, was configured according to operation specifications. The interactive simulation was accomplished through a pipe that operations drive the status model then the status model drives the physical model. The algorithm of interactive …

Research Method For Integrating Subjective And Objective Information In Evaluating Quality Level Of Journals, Zhang Quan, Wen Xin, Liping Yu, Jia Wei

Journal of System Simulation

Abstract: The evaluation of the quality level of academic journals was investigated. In order to overcome the drawbacks of current methods which made uses of only the subjective evaluation information or the objective information on the journals, a comprehensive evaluation method was proposed for integrating both the decision makers' subjective information and the objective information. The decision makers' subjective evaluation information was expressed in some grade, grade interval, or a fuzzy set over a grade evaluation set. The objective information of journals was reflected by the numerical attributes, such as, the total citation frequency, impact factor and immediacy …

Trainer Appropriation And Transfer Of A New Prevention Approach In Material Handling Based On Action Principles, Denys Denis, Maud Gonella, Marie Comeau, Martin Lauzier

Rapports de recherche scientifique

Mise en contexte et objectif

Prenant acte du constat d’échec des formations à la manutention axées sur l’enseignement exclusif de la technique sécuritaire « dos droit – genoux fléchis », une nouvelle approche d’intervention dite « stratégie intégrée de prévention en manutention » (SIPM) a été proposée en 2011. Son originalité repose, entre autres, sur l’utilisation de neuf principes d’action permettant de comprendre et de commenter la richesse des techniques de manutention utilisées naturellement par les manutentionnaires dans leur milieu de travail. L’étude a pour objectif central d’évaluer l’appropriation et le transfert de la SIPM par un groupe d’intervenants formés …

A Genetic Algorithm To Minimise Number Of Vehicles In An Electric Vehicle Routing Problem, Kiian Leong Bertran Queck, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

Electric Vehicles (EVs) and charging infrastructure are starting to become commonplace in major cities around the world. For logistics providers to adopt an EV fleet, there are many factors up for consideration, such as route planning for EVs with limited travel range as well as long-term planning of fleet size. In this paper, we present a genetic algorithm to perform route planning that minimises the number of vehicles required. Specifically, we discuss the challenges on the violations of constraints in the EV routing problem (EVRP) arising from applying genetic algorithm operators. To overcome the challenges, techniques specific to addressing the …

Survey Of Airflow Around A Heated Manikin As A Simulated Aeromedical Evacuation Patient On A Litter With Computational Fluid Dynamics Models, George P. Lemmer

Theses and Dissertations

Aeromedical Evacuations remain the predominant method used to transport patients from forward deployed areas of operations to secure locations with more robust medical infrastructure. Transportation of chemical warfare casualties and infectious patients require additional attention to prevent cross contamination. Specific airflow characteristics paired with environmental control system settings are a gap in scholarly literature. Based on the available literature computational fluid dynamics models were created to simulate the airflow around a patient represented by human geometry using commercially available software. In order to compare simulated and experimental results a heated manikin was placed in the MURPHEE aerosol exposure chamber and …

Aligning Performance Management Systems For Lasting Outcomes In Humanitarian Operations, Kalyn M. Howard

Theses and Dissertations

Logistics is dynamic, expansive, and critical to organizational success. While it is generally believed that effective logistics management is associated with positive performance outcomes, the links between organizational practice and performance are understudied. This dissertation leverages resource-based theory and organizational learning theory to examine organizational practice and performance in non-traditional logistics settings, with particular focus on military organizations and humanitarian operational settings. First, a meta-analytical study establishes generalizable associations between various operations management practices and performance outcomes. Then, this is applied to dynamic humanitarian logistics settings, exploring how practitioners perceive practice and performance, and how this is reported and documented …