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정경우(Chung, Kyeong-Woo),김세융(Kim, Se-Yung),양유창(Yang, Yoo-Chang),안승균(Ahn, Seung-Gyun),전유택(Jeon, Yoo-Taek),나상묵(Na, Sang-Mook) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Bipolar plate, which forms about 50% of the stack cost, is an important core part with polymer electrolyte membrane in PEMFC. Bipolar plates have been commonly fabricated from graphite meterial having high electrical conductivity and corrosion resistance. Lately, many researchers have concentrated their efforts on the development of metallic bipolar plate and stainless steel has been considered as a potential material for metallic bipolar plate because of its high strength, chemical stability, low gas permeability and applicability to mass production. However, it has been reported that its inadequate corrosion behavior under PEMFC environment lead to a deterioration of membrane by dissolved metal ions and an increase in contact resistance by the growth of passive film therefore, its corrosion resistance as well as contact resistance must be improved for bipolar plate application. In this work, several types of coating were applied to 316L and their electrical conductivity and corrosion resistance were evaluated In the simulated PEMFC environment. Application of coating gave rise to low interfacial contact resistances below 19m{Omega}cm² under the compress force of 150N/cm². It also made the corrosion potential to shift in the posit ive direct ion by 0.3V or above and decreased the corrosion current from ca. 9{mu}A/cm² to ca. 0.5{mu}A/cm² in the mixed solution of 0.1N;N₂SO₄ and 2ppm HF A coat ing layer under potentiostatic control of 0.6V and 0.75V_{SCE} for 500 hours or longer showed some instabilities, however, no significant change in coat Ing layer were observed from Impedance data. In addition, the corrosion current maintained less than 1{mu}A/cm² for most of time for potentiostatic tests. It indicates that high electrical conductivity and corrosion resistance can be obtained by application of coatings in the present work.
FMEA를 활용한 군수품 초도 생산 및 양산 단계의 위험 식별 방안 연구
이창희,양경우,박두일,이일랑,권준식,최일홍,김상부 한국품질경영학회 2014 품질경영학회지 Vol.42 No.3
Purpose: It can deduce improvement plan that recognizes any risk factors in initial production and mass production by using FMEA and through this process, the appropriate criteria for defence items can be established. Methods: It proposes two methodology - Apply DT/OT data achieved from the beginning mass production stage based on FMECA data of the design stage, to risk management, and risk management plan that reflected line and field faliure data in case of is offered. Results: It proposes the risk management plan through Bayesian method and the risk identification that considered MTTF estimated value in case of initial production process. In case of mass production process, both risk identification by using fault occurrence frequency scores and Byaesian method, In case of the Initial production and mass production, it proposes use both two methods. Conclusion: A more realistic risk identification method can be applied, and by this method the quality improvement effect is expected.
Q-BOM(Quality-BOM) 기반의 품질보증 효율화 방안 연구
이창희 ( Chang Hee Lee ),양경우 ( Kyung Woo Yang ),박두일 ( Doo Il Park ),김상부 ( S Kim ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.3
Purpose: For effective quality assurance activities, BOM-based quality assurance method is presented. This study introduces various BOM conversions such as Q-BOM. T-BOM, and S-BOM based on M-BOM structure. Methods: Product quality control via Q-BOM manages inspection/audit information. overall supply-chain of product. part requirements. and inventory status, T-BOM manages part traceability, and S-BOM enables statistical control over key process and parts at various hierarchy levels. Results: Quality plan template was developed based on the study results of BOM system including Q~BOM. T-BOM, and S-BOM. Conclusion: Through BOM(Q-BOM. T-BOM, and S-BOM) study and development of quality plan template, more systematic and comprehensive quality management plan is achieved.
FMEA를 활용한 군수품 초도 생산 및 양산 단계의 위험 식별 방안 연구
이창희 ( Chang Hee Lee ),양경우 ( Kyung Woo Yang ),박두일 ( Du Il Park ),이일랑 ( Il Lang Lee ),권준식 ( Jun Sig Kwon ),최일홍 ( Il Hong Choe ),김상부 ( Sang Boo Kim ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.3
Purpose: It can deduce improvement plan that recognizes any risk factors in initial production and mass production by using FMEA and through this process, the appropriate criteria for defence items can be established. Methods: It proposes two methodology - Apply DT/OT data achieved from the beginning mass production stage based on FMECA data of the design stage, to risk management, and risk management plan that reflected line and field faliure data in case of is offered. Results: It proposes the risk management plan through Bayesian method and the risk identification that considered MTTF estimated value in case of initial production process. In case of mass production process, both risk identification by using fault occurrence frequency scores and Byaesian method, In case of the Initial production and mass production, it proposes use both two methods. Conclusion: A more realistic risk identification method can be applied, and by this method the quality improvement effect is expected.
윤용식(Yun, Yong-Sik),정경우(Chung, Kyeong-Woo),양유창(Yang, Yoo-Chang),안승균(Ahn, Seung-Gyun),전유택(Jeon, Yoo-Taek),나상묵(Na, Sang-Mook) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
As the stainless steel has good corrosion resistance, mechanical property and ease of manufacture, it has been studied as the candidate material of metallic bipolar plate for automotive PIMFC. But, metal is dissolved under fuel cell operating conditions Dissolved ions contaminate a membrane electrode assembly (MEA) and, decrease the fuel cell performance. In addition, metal oxide formation on the surface of stainless steel increases the contact resistance in the fuel cell. These problems have been acted as an obstacle in the application of stainless steel to bipolar plate. Therefore, many kinds of coating technologies have been examined in order to solve these problems. In this study, stainless steel was coated in order to achieve high conductivity and corrosion resistance by several methods. Contact resistance was measured by using a tensile tester and impedance analyzer Corrosion characteristics of coated stainless steel were examined by Tafel-extrapolation method from the polarization curves in a solution simulating the anodic and cathodic environment of PEMFC. Fuel cell performance was also evaluated by single cell test. We tested various coated metal bipolar plate and conventional and graphite were also tested as comparative samples. In the result, coated stainless steel bipolar plate exhibited better cell performance than graphite to bipolar plate.
K21 보병전투차량에 FMEA 적용을 통한 RPN 평가방법 재정립
이창희 ( Chang Hee Lee ),양경우 ( Kyung Woo Yang ),김상부 ( Sang Bu Kim ) 한국품질경영학회 2012 품질경영학회지 Vol.40 No.3
Purpose: To ensure good quality munitions, we require quantitative risk management and optimal risk management of system characteristics. Methods: Failure mode and effects analysis (FMEA) is a widely used technique to assess or to improve reliability of products at early stage of design and development. Traditionally, the prioritization of failures for corrective actions is performed by developing a risk priority number (RPN). Results: This paper reestablishes an effective methodology for prioritization of failure modes in FMEA procedure. Revised evaluation criteria of RPN are devised. Conclusion: To verify the proposed methodology, it is applied to RPN evaluation for K21 infantry combat vehicle.