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2기통 소형 터보가솔린엔진에서 배기 밸브 타이밍 제어에 따른 LIVC, EIVC 상태에서의 엔진 효율 영향
장진영,우영민,신영진,고아현,정용진,조종표,김강출,표영덕,한명훈,Jang, Jinyoung,Woo, Youngmin,Shin, Youngjin,Ko, Ahyun,Jung, Yongjin,Cho, Chongpyo,Kim, Gangchul,Pyo, Youngdug,Han, Myunghoon 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.3
This study examines whether engine fuel efficiency is improved by optimization of the exhaust valve timing in a state where the intake valve timing has been optimized in a small turbo gasoline engine that has intake cams and exhaust cams with fixed valve opening periods. When the exhaust valve is opened late, the expansion stroke is longer, and the efficiency can be improved. A 2-cylinder turbo gasoline engine with 0.8 liters of displacement and an MPI (Multi Point Injection) fuel system was used. The engine was operated at 1,500 and 3,000 rpm, and the load conditions included a partial load of 50 N·m and a high load of 70 N·m. Data was recorded as the exhaust valve timing was controlled, and this was used to calculate the efficiency of combustion using a heat release, the fuel conversion efficiency, and the pumping loss. Results and the hydrocarbon concentrations in the exhaust gas were compared for each condition. Experiment results confirmed that additional fuel efficiency improvements are possible through exhaust valve timing control at 1,500 rpm and 50 N·m. However, in other operating conditions, fuel efficiency improvements could not be obtained through exhaust valve timing control because cases where the pumping loss and fuel/air mixture slip increased when the exhaust valve timing changed and the fuel efficiency declined.
1000MPa급 DP강의 Nd:YAG 레이저 용접부의 기계적 성질과 성형성에 미치는 용접 속도의 영향
장진영,최우남,정병훈,강정윤,Jang, Jin-Young,Choi, Woo-Nam,Jung, Byung-Hun,Kang, Chung-Yun 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.2
The effects of welding speed were investigated on penetration characteristics, defects and mechanical properties including formability test in Nd:YAG laser welded 1000MPa grade DP steels. A shielding gas was not used and bead-on-plate welding was performed with various welding speeds at 3.5kW laser power. Defects of surface and inner beads were not observed in all welding speeds. As the welding speed increased, the weld cross-section varied from the trapezoid having wider bottom bead, through X type, finally to V type in partial penetration range of welding speeds. The characteristic of hardness distribution was also investigated. The center of HAZ had maximum hardness, followed by a slight decrease of hardness as approaching to FZ. Significant softening occurred at the HAZ near BM. Regardless of the welding speed, the weld showed approximately the same hardness distribution. In the perpendicular tensile test with respect to the weld direction, all specimens were fractured at the softening zone. In the parallel tensile test to the weld direction, the first crack occurred at weld center and then propagated into the weld. Good formability over 80% was taken for all welding conditions.
전라남도 문화예술교육 종사자의 DISC 행동유형과 직무만족과의 관계연구
장진영(Jin-Young Jang),바트소리바상후(Batsuuri Baasankhuu),박지은(Ji-Eun Park) 한국엔터테인먼트산업학회 2021 한국엔터테인먼트산업학회 학술대회 논문집 Vol.2021 No.5
우리의 생활은 사람과 사람과의 관계에 의해 이루어진다. 조직생활 역시 업무의 연장선에 사람과의 관계가 중요하다. 직무만족은 직무성과나 조직몰입 등 조직관리의 다양한 분야에 영향을 주는 중요 변수이다. 본 연구에서는 이러한 문화예술교육종사자들의 DISC 행동유형과 직무만족과의 관계를 분석하고 이에 대한 시사점을 제시하고자 한다. 본 연구에서는 전라남도의 문화예술교육 종사자 300명에게 설문지를 배부하였으며 자료분석을 위해 SPSS 21.0, AMOS 21.0 통계프로그램을 사용하였다. 연구결과 주도형, 사교형, 안정형은 직무만족에 유의한 영향을 미쳤으며 신중형은 직무만족에 유의한 영향을 미치지 않는 것으로 나타났다. 하지만 어떤 유형이 문화예술교육분야에 더 옳고 그름의 판단보다는 각 성향에 맞게 각각 개인에게 맞는 직무와 역할이 주어진다면 작품 또는 프로젝트 등에 더욱 이상적일 것으로 판단된다. 또한 타 집단과의 비교연구가 이루어지지 않았다는 점 등의 한계점도 존재한다. Our lives are made by human-to-human relationships. Organizational life is also an extension of work, and relationships with people are important. Job satisfaction is one of the important variables affecting various areas of organizational management, such as job performance and organizational immersion. In this study, we would like to analyze and suggest implications for DISC behavior types and job satisfaction among these cultural and artistic education workers. In this study, a questionnaire was distributed to 300 culture and arts education workers in Jeollanam-do and SPSS 21.0 and AMOS 21.0 statistical programs were used to analyze data. Studies have shown that Dominance, Influence, and Steadiness types have significant effects on job satisfaction, while prudent types have no Conscient-iousness effects on job satisfaction. However, if a certain type of work and role is given to each individual according to his or her tendency rather than to judge whether it is right or wrong in the field of culture and arts education, it will be more ideal for works or projects. There are also limitations such as the lack of comparative research with other groups.
FTP-75, WLTC 시험 모드에서 LPG, CNG 자동차의 배출가스 및 PN 비교
장진영(Jinyoung Jang),이영재(Youngjae Lee),권오석(Ohseok Kwon),김정환(Jeonghwan Kim) 한국가스학회 2016 한국가스학회지 Vol.20 No.6
가스연료인 LPG와 CNG는 청정 대체연료로서 차량용 연료로 많이 사용되고 있다. 특히 CNG의 경우 저탄소연료로서 온실가스 배출량 저감에 기여할 수 있다, LPG의 경우 가솔린 차량과 거의 동등한 성능을 가지면서도 연료가격이 저렴하여 택시에 많이 사용되고 있다. 본 연구에서는 동일차량에서 LPG와 CNG를 사용하여 배출가스와 최근 문제가 되고 있는 입자상물질의 배출개수(PN; particle number)에 대하여 비교하였다. 차대동력계를 이용하여 FTP-75와 WLTC 모드에 대하여 시험을 진행하였다. PN은 두 대의 CPC(Condensation Particle Counter)를 이용하여 5 nm 이상과 23 nm 이상의 입자에 대하여 배출 개수를 측정하였다. 배출가스에 있어서는 CO2의 경우 LPG 차량이, 메탄의 경우 CNG 차량이 많이 배출되었다. PN의 경우 두 연료에서 배출되는 PN은 비슷한 수준이었으며, WLTC 에서 고속운전하는 동안 23 nm 이하 크기의 입자 배출 개수가 많았다. Liquefied petroleum gas (LPG) and compressed natural gas (CNG) are often used as fuel for vehicles because they are clean alternative gas fuels. CNG, as a low-carbon fuel, can contribute to the reduction of greenhouse gas emissions. LPG is often used as fuel for taxis because the performance is almost the same as that of gasoline but the price is lower. In the present study, the exhaust gas and the particle number (PN) of particulate matter, which is a recent environmental issue, were compared between LPG and CNG for the same vehicle. A chassis dynamometer was used to conduct the test according to the Federal Test Procedure (FTP)-75 and Worldwide harmonized Light-duty vehicle Test Procedure (WLTC) modes. The PN values of discharged particles having sizes of 5 nm or larger and 23 nm or larger were measured using two condensation particle counters (CPC). The ratio of carbon dioxide was high in the exhaust gas from the LPG vehicle; the ratio of methane was high in the exhaust gas from the CNG vehicle. The PN values of the emitted particles from the two fuels were similar. The PN values of particles having sizes of 23 nm or smaller were high in the high-speed WLTC mode.
장진영(Jinyoung Jang),우영민(Youngmin Woo),이영재(Youngjae Lee),김종남(Jongnam Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this research, Ammonia was assessed using ammonia as a fuel for combustion engine. Since ammonia has similar physical property with LPG(liquid petroleum gas), LPG fuel system was plan to use an ammonia fuel system. However, Ammonia-LPG fuel system reactivity resulted in system failure should be checked. For ammonia-LPG fuel system reactivity test, reactor was made and parts of LPG fuel system was assessed. Through the reactor test, O-rings used in parts of fuel injector and tank were corroded. And fuel pump and floater indicating fuel lever were affected. For using LPG fuel system as ammonia fuel system, O-rings should be changed Kaliz O-ring and fuel pump and floater also should be replaced.