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급가감속 운전에 따른 듀얼 모노리스형 촉매변환기 내의 유동 균일도와 압력 강하에 관한 수치적 연구
김영득,정수진,김우승,Kim, Young-Deuk,Jeong, Soo-Jin,Kim, Woo-Seung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
The conversion efficiency, durability and pressure drop of the automotive exhaust catalysts are dependent on the flow distribution within the substrate. Conventional porous medium approaches assuming monolith resistance based on the one-dimensional laminar flow for simulating the flow through the automotive exhaust catalysts over-predict the flow uniformity in the monolith. In this study, additional pressure loss is also considered by accounting for entrance effects due to the oblique flow incident on the front face of monolith as a consequence of flow separation and recirculation within the diffuser. The incorporation of an additional pressure loss improves the predictions for the maximum flow velocity within the substrate. An numerical study has also been conducted for the three-dimensional unsteady incompressible non-reacting flow inside various dual-monolith catalytic converters for the rapid acceleration/deceleration driving.
관개용 저수지 농업용수의 국가 전과정 목록분석 데이터베이스 구축
김영득,박필주,Kim, Young-Deuk,Park, Pil-Ju 한국농공학회 2011 한국농공학회논문집 Vol.53 No.3
The objective of the study is to develop life cycle inventory (LCI) database of dam, a major facility for irrigation water supply. The types of database developed are three out of nine dams according to the size of the wate r storage capacity: two kinds larger than 500,000 $m^3$ depending on gate for discharging (Type 1) and the other dam smaller than 500,000 $m^3$ (Type 2). According to the LCI analysis, type 1 larger than 500,000 $m^3$ storage capacity with gate has the lowest environment impact in the 6 impact categories. The impact of the type 1 accounts for 7~35 % of the type 2 for supplying irrigation water. Comparing with the environment impacts of water for other uses such as drinking and industrial water, the impacts of 1 $m^3$ irrigation water supply is 4~45 % of the one for industrial water supply and 1~16 % of the drinking water's. The three types of LCI DB on the irrigation water by dams will be useful in the application of Life Cycle Assessment in agricultural products and environmental labelling including carbon footprint since it is complied to the guidelines of LCI DB constr uction issued by Ministry of Environment and Ministry of Knowledge Economy.
반도체 제조장비 네트워크 통신을 위한 데이터 변환 시스템에 대한 연구
김영득 ( Young-deuk Kim ),임용묵 ( Yong-muk Lim ),김우성 ( Woo-sung Kim ),박근덕 ( Keun-deok Park ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2
반도체 공정의 자동화를 위해 데이터 통신 표준 규약인 SECS Protocol을 제정하고, 대부분의 반도체 생산 관련 장비가 인터페이스 부문에서 이 표준을 따르게 되었다. SECS Protocol은 메시지 전송 프로토콜을 정의하는 SECS-I 그리고 메시지 항목을 정의하는 SECS-II로 나뉜다. 하지만 SECS-I의 단점을 보완하기 위해 HSMS가 제안되었는데 HSMS는 TCP/IP를 지원하므로 LAN 환경에서도 통신이 가능하게 되었다. 오늘날 네트워크의 발달로 WAN 환경으로 커지고 있는데, 본 논문에서는 이러한 변화에 따라 장비와 호스트 사이의 통신을 인터넷을 통해 전송하기 위한 메시지 변환에 관한 설계 및 구현을 하였다.
전과정평가(LCA)기법을 이용한 농업용 저수지와 양수장의 환경영향비교
김영득 ( Young Deuk Kim ),노리히로이츠보 ( Norihiro Itsubo ),이건모 ( Kun Mo Lee ),김해도 ( Hae Do Kim ) 한국전과정평가학회 2012 한국전과정평가학회지 Vol.13 No.1
The aim of this study is to evaluate the environmental impacts of irrigation facilities using a Life Cycle Assessment tool and to compare two different types of water resources, dam and pumping station suppling 78% of irrigation water in Korea. Study facilities, Idong reservoir and Eunsan pumping station, are located in Ansung-Si, Gyeonggi-Do. Life cycle impact methodology used in the study is Eco-indicator99(E) to assess the environmental impacts of 1 ㎥ of agricultural water supply. This case study is a preliminary work to evaluate environmental impacts associated with water use in the boundary of the existing life cycle impact assessment method. The functional unit for comparison can be defined as a 1.5 billion ㎥ to supply irrigation water to the paddy field of 2,156 ha for 70 years. As a result of LCA of reservoir, most of environmental impact is derived from the use of construction materials in the construction stage like concrete and cement. Electricity consumption is a key issues of pumping station in the operation stage due to the fossil fuel use. It can be said that dam seems to be a more sustainable facility than the pumping station in the 70-year life cycle of this study excluding ecological impacts, depending on geological condition in Korea, though there is no consideration of land use and ecological impacts by inundation.
Twofish 알고리즘을 이용한 저용량 암호화 Chip의 모듈설계
김영득(Young-Deuk Kim),장영조(Young-Jo Jang) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
Twofish 알고리즘은 작은 부피의 로직, Triple-DES보다 강력한 암호화 레벨, 암호화 속도 등을 갖추어 모듈 설계 알고리즘으로 선정하였다. Twofish 알고리즘은 bitwired-XOR, Permutation, S-box, MDS, PHT를 걸치는 H함수를 각기 다른 키로 반복 라운드를 함으로써 대상 데이타를 암호화 한다. 64~256bit의 키 크기와 라운딩 횟수를 조정하여 모듈의 부피나 처리속도를 유동성 있게 조절할 수 있는 장점이 있다. 하드웨어 기기와 응용에 사용하기 위하여 VHDL 모듈로 알고리즘을 설계하고 그 동작을 검증하였다. 구현된 회로는 기존의 방법에 비하여 파이프라인 단계를 적용하므로써 약 23%의 속도 향상을 얻을 수 있었다.
가솔린 엔진의 배출가스 저감을 위한 듀얼 모노리스형 촉매변환기의 형상 및 귀금속 촉매의 축방향 분포 최적화
김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In practical applications, monolithic catalytic converters are operated at non-isothermal conditions. In this case, the active metal distribution along the length of the converter may influence its performance. Indeed, better conversions can be achieved by controlling the distribution of the same quantity of active material. In this study, a one-dimensional catalyst model has been adopted to predict the transient thermal and conversion characteristics of a dual monolithic catalytic converter with Platinum/Rhodium (Pt/Rh) catalysts. The optimal design of a longitudinal noble metal distribution of a fixed amount of catalyst is investigated to obtain the best performance of a dual monolithic catalytic converter by using a micro genetic algorithm with consideration of heat transfer, mass transfer, and chemical reaction in the monolith during FTP-75 cycle. The optimal axial distribution of the catalyst is determined by solving the multi-objective optimization problems which are to minimize both the CO cumulative emissions during FTP-75 cycle, and the difference between the integral value of a catalyst distribution function over the monolith volume and total catalytic surface area over total monolith volume. The parametric investigations for three cell densities of the front monolith are carried out by varying the volume ratio between front and rear monoliths with fixed volume and cell density of the rear monolith.
급가감속 운전에 따른 듀얼 모노리스형 촉매변환기 내의 유동 균일도와 압력 강하에 관한 연구
김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Conversion efficiency, durability and pressure drop of automotive exhaust catalysts are dependent on the flow distribution within the substrate. Conventional porous medium approach assuming monolith resistance based on one-dimensional laminar flow for simulating the flow through automotive exhaust catalysts overpredicts the flow uniformity in the monolith. In this study, additional pressure loss accounting for entrance effects due to oblique flow incident on the front face of monolith as a consequence of flow separation and recirculation within the diffuser is considered and incorporation of an additional pressure loss improves the predictions for the maximum flow velocity within the substrate. A numerical study of three-dimensional unsteady incompressible non-reacting flow inside various dual-monolith catalytic converters for the rapid acceleration/deceleration driving has also been conducted.