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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.
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.
굴곡의 표면을 가진 금속의 레이저 용융에 대한 열 및 유체유동 해석
김영득(Young-Deuk Kim),심복철(Bok-Cheol Sim),김우승(Woo-Seung Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Laser melting problems with deformed substrates are investigated by axisymmetric numerical simulations.<br/> Source-based method is used to solve the energy equation, and the momentum equations are solved in the<br/> liquid domain with SIMPLER algorithm. Using a laser beam with a top-hat heat flux distribution, this study is<br/> performed to examine the effect of surface deformation, beam power density and surface tension force on the<br/> melt pool during laser melting. Surface temperature decreases with increasing surface deformation, while<br/> surface velocity increases. It is found that surface deformation, beam power density and surface tension force<br/> have a very significant effect on heat transfer and fluid flow during laser melting.
Survival Motor Neuron 유전자 Exon 7과 8 부위가 결실된 제1형 척수성 근위축증 1례
김영득(Young Deuk Kim),김재철(Jae Chul Kim),황치관(Chi Kwan Hwang),이건수(Kun Su Lee) 대한소아신경학회 2003 대한소아신경학회지 Vol.11 No.1
Spinal muscular atrophy(SMA) is a genetic disorder of the motor neurons that cause muscular weakness and muscular atrophy due to anterior horn cell degeneration. Classic spinal muscular atrophy patient is caused by mutation in the chromosome 5(q11.2-q13.3), and the majority of the patient shows homozygous deletion of the telomeric survival motor neuron(SMN) gene in the chromosome 5. Deletion of exon 7 and 8 of the SMN gene and deletion of exon 4 and 5 of the neuronal apoptosis inhibitory protein(NAIP) are typically observed in SMA patients. The SMN protein plays a role in an essential cell metabolism process, the splicing of pre mRNA in the spliceosomes. We report a 7 month old male with SMA. He showed rapidly aggrdvatial muscular weakness and died at 7 months. His DNA analysis proved deletion of exon 7 and 8 of the telomeric copy of the SMN gene. 저자들은 survival motor neuron 유전자의 exon 7, 8 부위가 결실된 척수성 근위축증 환아 1례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.
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.
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.