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후분사시기가 대형디젤엔진의 연소 및 배기에 미치는 영향에 관한 수치해석적 연구
최민수(Minsu Choi),배재옥(Jaeok Bae),서현욱(Hyunuk Suh),이병화(Byunghwa Lee),전충환(Chunghwan Jeon) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
The objective of this numerical investigation is to analyze characteristics of combustion and emission on various post injection timing in heavy duty diesel engine by using AVL-FIRE. The diesel engine makes NO but it is available to reduce NO by addition to post injection. This numerical study was implemented under conditions with post injection timing 10CA, 20CA. As a result, the longer dwell time is, the higher peak pressure. But end of pressure curve tended to decrease compared to single injection. In emissions, NO was decreased and soot was increased in the case of longer dwell time. Thus, it is available to decrease NO formation.
국내 전이성 투명세포 신장암 환자의 1차 표적치료제 동향: Sunitinib과 Pazopanib, 다기관 연구
최민수(Minsu Choi),신택준(Teak Jun Shin),김병훈(Byung Hoon Kim),김천일(Chun Il Kim),이경섭(Kyung Seop Lee),최석환(Seock Hwan Choi),김현태(Hyun Tae Kim),김태환(Tae-Hwan Kim),권태균(Tae Gyun Kwon),고영휘(Young Hwii Ko),하윤수(Yoon Soo 대한비뇨기종양학회 2022 대한비뇨기종양학회지 Vol.20 No.2
Purpose: There have been few reports on comparison between sunitinib and pazopanib as first-line targeted therapy in Korean metastatic clear cell renal cell carcinoma (ccRCC). We sought to analyze the treatment trends of metastatic ccRCC by comparing the effects and adverse events of sunitinib and pazopanib. Materials and Methods: Data of 357 metastatic RCC patients who received the sunitinib or pazopanib as the first-line targeted therapy from the Daegyeong Oncology Study Group database was obtained and analyzed. Among these patients, patients who only clear cell type was confirmed after needle biopsy or nephrectomy were included, and patients who underwent target therapy for less than 3 months were excluded. Results: Of 251 patients who met the inclusion criteria, sunitinib and pazopanib group were identified in 156 (62%) and 95 patients (38%), respectively. Pazopanib group was older (66 years vs. 61 years, p=0.001) and more symptomatic (65% vs. 52%, p=0.037) and had more patients with Karnofsky performance status <80 (20% vs. 11%, p=0.048) and fewer number of organ metastases (p=0.004) compared to sunitinib group. There was no significant difference in disease control rate (88.5% vs. 87.3%, p=0.744), the median progression-free survival (19 months vs. 15 months, p=0.444) and overall survival (25 months vs. 19 months, p=0.721) between sunitinib and pazopanib. The most common grade 3/4 adverse events with sunitinib and pazopanib were anemia (5%) and hand-foot syndrome (3%), respectively. There was no significant difference between sunitinib and pazopanib in number of patients who experienced grade 3/4 adverse events (15% vs. 11%, p=0.275). However, there were more patients who discontinued treatment due to only adverse events in sunitinib group compared to pazopanib group (12% vs. 3%, p=0.020). Conclusions: In Korean metastatic ccRCC, pazopanib tended to be used in patients with poorer health status compared to sunitinib. Sunitinib and pazopanib had no significant difference in treatment effect and survival, but pazopanib had more tolerable adverse events.
LNG를 첨가한 대형디젤엔진의 연소 및 배기 특성에 관한 수치해석적 연구
최민수(Minsu Choi),배재옥(Jaeok Bae),서현욱(Hyunuk Suh),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The objective of this numerical investigation is to analyze characteristics of combustion and emission on various LNG percent in LNG-Diesel dual fuel engine by using AVL-FIRE. The diesel engine makes soot but it is available to reduce soot by addition to LNG. This numerical study was implemented under conditions with LNG percents 0%, 15%, 30%, 45%, 60%, 75%. As a result, the higher LNG percent is, the higher peak pressure and temperature is. But ignition delay and combustion duration tend to decrease compared to that of diesel combustion. In emissions, NO, CO are increased and Soot(except for LNG 75%), CO₂ are decreased in the case of high LNG percent. Thus, it is necessary to find proper LNG percent.
LNG-Diesel 혼소 및 배기 특성에 관한 수치해석적 연구
최민수(Minsu Choi),배재옥(Jaeok Bae),서현욱(Hyunuk Suh),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.11
The diesel engine makes soot because it is difficult to make homogeneous mixture gas. New combustion and exhaust aftertreatment technologies have been developed to solve this problem. In this study, methane will be premixed to make homogeneous mixture gas. Numerical study was implemented in constant volume combustion chamber with AVL-FIRE to verify this method. As a result, the higher premixed methane is, the higher heat release rate, NOx and soot. Because of high equivalence ratio, the result was not good. Therefore, the study will need under various equivalence ratio in the future work.
RCCI의 가솔린/디젤 비에 따른 연료 증발 및 점화 특성에 관한 수치적 연구
최민수(Minsu Choi),배재옥(Jaeok Bae),서현욱(Hyunuk Suh),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-1
RCCI (Reactivity Controlled Compression Ignition) is one of combustion technologies which can control reactivity by using the different firing characteristic of gasoline and that of diesel. In this study, numerical investigation for spray characteristics was carried out in RCCI on various gasoline percents and diesel injection timing. Numerical investigation was implemented under conditions with gasoline percents 70%,80%,90% and additional conditions with diesel pilot injection 10%,15%,20% by using AVL-FIRE. As a result, the higher gasoline percent is, the higher evaporation and injection duration and OH emission is. Thus, it can see fast flame propagation because of homogeneous gasoline gas, which is an advantage to accomplish high-efficiency and low emission.
최민수(Minsu Choi),배재옥(Jaeok Bae),한동식(Dongsik Han),박재홍(Jaehong Park),조성래(Sunglai Cho),전충환(Chunghwan Jeon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A driving cycle was developed to measure fuel consumption(FC) and emissions for standard vehicles. But the development of driving cycle for the vehicles of military operational area is not easy because of this area"s characteristics such as unpaved roads with steep and undulating terrain . Therefore, this study is an attempt to develop a driving cycle for military operational area. A methodology of route selection, instrumented vehicle data collection, random selection of candidate cycle, and comparisons of RMSE and information value for the candidate cycle, can be utilized to generate cycles. The military driving cycle represented in this study is an average speed of 27.15km/h, an average grade of 0.20%. Compared with real driving cycle on the Military operational area, the military driving cycle with unpaved roads is representative of the military vehicles in military areas.
배재옥(Jaeok Bae),최민수(Minsu Choi),서현욱(Hyunuk Suh),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.11
This paper describes the numerical results of combustion and emission characteristics in gasoline with hydrogen on various equivalent ratio and rate of hydrogen addition by AVL-FIRE. GDI(Gasolin Direct Injection) which is a kind of gasoline combustion has a advantage to achieve high performance and fuel-efficiency by accurate control of combustion through direct injection of gasoline in a cylinder, but produce large amount of Soot. In this study, we try to solve the problem by adding hydrogen. We made the initial gas composition of CVCC(Constant Volume Combustion Chamber) to homogeneous mixture of air and hydrogen(24%, 48%) and let equivalence ratio to three conditions(0.5, 0.8, 1.0). The numerical results indicate that there is a ID(Ignition Delay) and reduction of exhaust emission including Soot according to a increase of hydrogen addition. Especially, COx and NOx emission are reduced by decreasing initial amount of gasoline and air in CVCC.