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최병도(Byungdo Choe),황우현(Woohyun Hwang),허건수(Kunsoo Huh),김명준(Myoungjune Kim),김주곤(Joogon Kim),정대종(Daejong Jung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
EMB is considered as the next generation braking mechanism because it has simple structure and is environment friendly. However, as other brake mechanisms, EMB should be operated reliably for any operating conditions. EMB should be designed with fail-safe and fault-tolerant control concepts, which requires robust fault detection algorithms for various possible faults. But, in the design of fault detection algorithms, it is very difficult to construct faulty conditions in real EMB and thus, simulations are often used to emulate the faulty conditions. In this paper, a simulation tool is developed using the commercial software to emulate gear faults in the EMB mechanism.
김성일 ( Sungil Kim ),김준 ( Jun Kim ),김현정 ( Hyunjung Kim ),정병도 ( Byungdo Chung ) 한국로지스틱스학회 2016 로지스틱스연구 Vol.24 No.4
각 지역의 혈액원이 인근에 위치한 병원에 혈액을 공급하는 현재의 혈액 공급 체계에서는 긴급하게 혈액이 필요한 응급 상황 발생 시, 필요한 혈액을 신속하게 배송하기 어렵다. 특히 혈액원에서 한 시간 이상의 거리에 위치한 병원들은 수혈이 늦어지는 경우 환자의 치료 결과에 부정적인 영향을 미칠 수 있다. 본 연구에서는 기 존 병원 중 일부를 혈액 분배 병원으로 지정하고, 주변에 위치한 병원들에게 빠르게 혈액을 배송할 수 있는 새로운 혈액 공급 사슬 체계를 제안한다. 기존 병원들 중 혈액 분배 병원을 선정하고, 혈액 분배 병원에 인근 병 원을 할당하기 위해 Minimax 최적화 모델을 개발하였다. 경상북도에 위치한 병원 중 응급 의료기관으로 지정 된 병원들을 대상으로 실제 데이터를 수집하여 수치실험을 진행하였다. 응급상황에 대응하기 위해서는 최소 5 개 이상의 병원들이 혈액 분배 병원으로 지정되어야 함을 알 수 있었으며, 민감도 분석을 통하여 의사결정의 기준을 제공하였다. Under emergency circumstances, a hospital requires a large amount of blood and a regional blood services center is not able to supply the blood to hospitals urgently. In particular, hospitals taking more than one hour from the regional blood services center cannot give a transfusion into patients, which will result in critical impact on the treatment. This paper aims to supply blood quickly to hospitals by developing a new agile blood supply chain system. We develop a minimax mathematical model for assigning regional hospitals to blood distribution hospitals and grouping hospitals based on the assigned blood distribution hospitals. Numerical experiments are conducted with the data about hospitals in Gyeongsangbuk-do, Korea. An in-depth analysis is carried out by changing the number of blood distribution hospitals and comparing the minimax model with a minisum model. Our results show that the number of the blood distribution hospitals should be greater than five and the minimax model is suitable for emergency response.
Effectiveness Evaluation on Human Engineering Part in Wolsong 1 Stress Test
Byungdo Ko,Jehun Kim,Jonghyun Youn 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
After Fukusima 1 nuclear power plant accident in Japan, lots of measures have been taken to strengthen the safety of the nuclear power plant. One of them is stress test, which evaluates the maintainability of plant safety assuming the most severe condition that has no power supply and ultimate heat sink. This report describes one of stress test results performed for domestic nuclear power plants in the point of human engineering aspect such as organization, personnel, working procedure, man-machine interface, working tool, environmental condition, education and training, etc. The stress test for the area of human engineering has been conducted in accordance with the international guideline, which establishes ultimate accident scenarios and evaluates time and measures during the process of scenarios for recognizing the status, deciding countermeasures, installing counter-measuring facilities and its implementability before the plant reaches function failure, fuel damage or containment failure. It also evaluates the existence of relevant equipment and tools and its utilization strategy, relevance of organization and personnel, and work procedure. The evaluation results show that all the plants are appropriately prepared and maintained against ultimate condition.
강병도(Byungdo Kang),이호상(Hosang Lee),김형구(Hyounggu Kim),박경석(Kyoungsuk Park),용부중(Boojoong Yong),서태범(Tae-Beom Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
LEDs (Light Emitting Diode) become more significant in exterior automotive lighting systems since they have been applied to CHMSL (Center High Mounted Stop Lamps) in 1990s. The LEDs are environmental friendly as well as energy saving light sources. They also provide long life and virtually unlimited styling potential in automotive headlamp applications. However, the chromaticity characteristics and the heat dissipation of LED headlamps are much different from conventional headlamps such as HID and halogen. An appropriate heat dissipation in LED headlamps is necessary for practical usage. In this study, we develop a heat dissipation system for an LED headlamp using CFD (Computerized Fluid Design) method. The prototype of LED headlamp is evaluated with respect to chromaticity performance using an anti-heat chamber. The developed LED headlamp shows a good visibility performance while further development for chromaticity is still necessary.
황화수소 피독이 고분자전해질 연료전지에 미치는 영향과 회복기법
천병도 ( Byungdo Chun ),김준범 ( Junbom Kim ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.1
고분자전해질 연료전지(PEMFC: polymer electrolyte membrane fuel cell)는 일산화탄소(CO)나 황화수소(H<sub>2</sub>S)가 포함된 연료가 주입될 경우 성능이 저하된다. 일반적으로 멀캅탄 계열의 부취제가 첨가된 탄화수소를 개질하여 생성된 수소에는 미량의 황화수소가 포함되어 있다. 본 연구에서는 황화수소를 수소에 첨가하여 anode에 주입하였을 경우에 연료전지 성능에 미치는 영향을 파악하고, 3가지 다른 회복방법인 순수 수소 주입법, 전위 순환법과 물 순환법을 적용한 경우의 회복률을 비교하여 보았다. PEMFC의 성능은 전기화학적 방법인 polarization curve, electrochemical impedance spectroscopy (EIS)와 cyclic voltammetry (CV)를 사용하여 분석하였다. 피독에 대한 회복방법인 순수 수소 주입법과 전위 순환법을 사용한 경우에는 회복률이 적었고, 물 순환법을 사용한 경우에는 초기에 대비하여 약 95% 이상 성능이 회복된 것을 확인하였다. 직접적으로 피독에 노출된 anode에 물을 흘린 경우의 성능회복률이 높았으며, cathode에 흘린 경우에도 물의 crossover에 의한 효과로 전위 순환법보다 우수한 회복률을 보였다. 이러한 연구결과로부터 황화수소 피독에 대한 회복기법을 구축함으로서 연료전지의 내구성을 향상시킬 수 있고, 불순물이 미량 함유된 저가 수소의 사용을 가능하게 함으로서 연료전지 보급에도 기여할 수 있을 것이다. The performance of polymer electrolyte membrane fuel cell (PEMFC) could be deteriorated when fuel contains contaminants such as carbon monoxide (CO) or hydrogen sulfide (H<sub>2</sub>S). Generally, H<sub>2</sub>S is introduced in hydro-gen by steam reforming of hydrocarbon which has mercaptan as odorant. H<sub>2</sub>S poisoning effect on PEMFC performance was examined on this study. Pure hydrogen injection, voltage cycling and water circulation methods were compared as performance recovery methods. The PEMFC performance was analyzed using electrochemical methods such as polarization curve, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Pure hydrogen injection and voltage cycling methods showed low recovery ratio, however, water circulation method showed high recovery ratio over 95%. Because anode was directly poisoned by H<sub>2</sub>S, anode water circulation showed higher recovery ratio compared to the other methods. Water circulation method was developed to recover PEMFC performance from H2S poisoning. This method could contribute to PEMFC durability and commercialization.