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Design of Gas Flow Channel Routes in a PEM Fuel Cell System Using Topology Optimization
Hong Lie Sun(손홍렬),Cheol Kim(김철),Jae Uk Shin(신재욱) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
연료 전지의 유동채널에 관한 효과적인 위상최적화 방법은 이미 기체유동 채널의 위상최적화 분포를 찾는 분야까지 재발되고 적용되었다. 이 논문은 주로 기본적인 밀도 계산, 기체에 관한 확산방정식 및 incompressible한 Navier-Stakes Equation들로 결합시킨 위상최적화의 수치적 공식을 파생시키고 해결하는 방법을 기술한다. FEM을 이용하여 유체의 공간적 디자인 도메인을 정의하였다. 이 과정에서 도메인과 mesh는 최적화 과정에서 변하지 않았고, 최적화 변수 0은 Stake flow, 1은 Porous flow를 표현한다. 유한요소해석법으로 Navier-Stokes Equation를 이용하여 PDE form의 유체 유동 속도와 압력을 계산하였고 차후 해석하게 될 민감도를 찾기 위해 요소 행렬을 계산하였다. Motivation of this study is to apply the topology optimization technique and to find the route of gas flow channels in the bipolar plate of a fuel cell. The goal of optimization is to maximize the mean reaction rate of gases by finding the optimal porosity distribution. In an example analysis, a solution is pumped through a catalytic bed, where a solute species reacts as it gets in contact with the catalyst. Proton exchange membrane fuel cell (PEMFC) has a lot of virtues such as high-power density, high-energy efficiency, low-temperature operation, fast start-up and zero-emission, so it can be used for a car, an electrical equipment, portable power, and stationary products. The performance degradation of PEMFC is mainly induced by the unreasonable design route of bipolar plates. The optimum shape and route of gas flow channels in bipolar plates can make the reaction rate more uniform.
A Review of Virtual Anchor Node Technology: Construction and Application
Zhang Hong-lie,Li Cheng,Zhao Xin,Liu Yan-ju 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.4
The localization accuracy of the wireless sensor network node is improved by introducing the virtual anchor node, so the virtual anchor node is constructed and applied by many researchers to optimize the localization algorithm further. This paper presents the broad definition of the virtual anchor node and indicates its significance in the wireless sensor network node localization; the wireless sensor network node localization algorithm based on the virtual anchor node is introduced mainly in two aspects of constructing the virtual anchor node and its application in localization. The scheme for constructing the virtual anchor node includes the random construction method, the geometric constraint method, the node upgrade method, the network training method, etc. And the scheme for its application in localization includes the model reconstruction method, the rank sequence method, etc. By making a concrete analysis of the localization scheme based on the virtual anchor node, its future research prospect and its application development trend are put forward.
열유동 및 화학반응을 고려한 PEMFC 연료전지 가스유동채널의 위상최적설계
손홍렬(Hong-Lie Sun),김철(Cheol Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Motivation of this study is to apply the topology optimization technique and to find the route of gas flow channels in the bipolar plate of a fuel cell. The goal of optimization is to maximize the mean reaction rate of gases by finding the optimal porosity distribution. In an example analysis, a solution is pumped through a catalytic bed, where a solute species reacts as it gets in contact with the catalyst. Proton exchange membrane fuel cell (PEMFC) has a lot of virtues such as high-power density, high-energy efficiency, low-temperature operation, fast start-up and zero-emission, so it can be used for a car, an electrical equipment, portable power, and stationary products. The performance degradation of PEMFC is mainly induced by the unreasonable design route of bipolar plates. The optimum shape and route of gas flow channels in bipolar plates can make the reaction rate more uniform.
Research on Cloud Resource Section Method for the Multi-layer Ontology
Zhang Hong-lie,Li Xin,LIU Yan-ju,Li Cheng 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.1
To solve the problem of cloud resource discovery in the interconnected environment for multiple providers, a resource selection method for the multi-layer ontology is propose from the view of software developer requirements. The ontology is adopted to describe the user requirements, the resource constraint requirements and the cloud resource attribute firstly. Then, the bidimensional matching algorithm is constructed based on two principles of concept matching and attribute matching. And the resource discovery and resource selection are realized by the algorithm, combine with the ontology mapping. The method not only implements the resource selection among cloud providers, but also eliminates the implementation details in the process of resource selection. It overcomes the technical limitations of the single cloud provider. The simulation results show that the importance of the resource requirements is adopted by bidimensional matching algorithm to carry out element level matching which improves the recall and precision of resources greatly.
Hybrid Patterns Recognition of Control Chart Based on WA-PCA-PSO-SVM
Liu Yan-zhong,Zhang Hong-lie,Liu Yan-ju,Jiang Jin-gang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
Based on the analysis of the defect of traditional model, this paper proposes a new control chart pattern recognition model, which includes Wavelet Analysis (WA), Principal Component Analysis (PCA), Particle Swarm Optimization (PSO) and Support Vector Machine (SVM). WA is good to eliminate noise control chart anomaly pattern recognition of the adverse effect. PCA eliminates the redundant information of data between SVM and reduces the input dimension and computational complexity. PSO algorithm optimizes the parameters of SVM and the establishment of the optimal control chart anomaly pattern classifier can solve the problem optimal parameters of SVM. The simulation results show that the model is feasible, the results are reliable. This algorithm improves the control chart abnormal state average recognition accuracy and be used in the machining process real-time monitoring.
무선 홈네트워크 구현을 위한 UWB와 60㎓ 대역 무선 통신 기술의 활용방안과 시장전망
홍석수(Seok-Soo Hong),박종훈(Jong Hun Park),이동주(Dong-Joo Lee),이재섭(Jaesup Lee),홍정완(Jung-Wan Hong),이창훈(Chang-Hoon Lie) 한국전자거래학회 2008 한국전자거래학회지 Vol.13 No.2
컴퓨터와 디지털 미디어 기기의 발전으로 인해 무선 홈네트워크 구축 시 전송이 요구되는 정보의 용량이 증가함에 따라 이를 처리할 수 있는 새로운 무선 통신 기술이 요구되고 있는 상황에서 UWB와 60㎓ 대역 무선 통신 기술이 그 대안으로 활발히 연구되고 있다. 본 연구에서는 UWB와 60㎓ 대역 무선 통신 기술의 국내외 동향과 특징을 알아보고, 무선 홈네트워크에서의 역할과 그 구현방안을 제안하였다. 끝으로 UWB와 60㎓ 대역 무선 통신 기술의 주된 서비스 분야로 예상되는 WPAN과 HDMI의 시장 전망에 대해 서술하였다. The demand of wireless communication system is increasing due to the development of computers and other digital media appliances. In particular, new wireless communication technology is necessary for implementation of home network since a lot of data transmission is occurred. Recently, two wireless communication technologies, Ultra Wide Band(UWB) and 60㎓ band wireless communication technology, have being developed for high-speed data transmission and Wireless Personal Area Network(WPAN). In this paper, we study the present development condition of these two technologies and a role of them in home network. We also suggest the method to implement the home network using all wireless communication technologies. At the end, we outlook the market of WPAN and High Definition Multimedia Interface(HDMI).