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이계은,김나영,조영준,이동률,박성욱 한국분무공학회 2017 한국액체미립화학회지 Vol.22 No.4
A gasoline direct injection engine has an intake air temperature can be lowered by the fuel vaporization in the com-bustion chamber increase the volume efficiency is high compression ratio. Therefore, study for injection rate and char-acteristics which influence mixture formation in combustion chamber is important. Movement of the injector needle has a direct effect on the injection of the fuel, such as formation of cavitation, the fuel injection rate, etc. Therefore, recent studies on the dynamic characteristics of the injector considering the movement of the needle have been reported, but it takes a lot of time and cost to experimentally confirm the movement of the needle inside the injector. In this study, AMESim, a commercial 1-D code, and Star-CCM+, a 3-D CFD code, were used to predict the dynamic performance of the injector with needle motion. In order to predict the movement of the needle under the high pressure, the result of the surface pressure distribution according to the movement of the needle was derived by using the morphing tech-nique of flow analysis. In addition, we predicted the injection rate of the injector considering the movement of the needle in conjunction with the 1-D code. The injection rate of the injector was measured by the BOSCH’s method and the results were similar to those of the simulation results. This method can predict the injection rate and injection characteristics and this result is expected to be used to predict the performance of gasoline direct injection engines with low cost and time in the future.
박상현,천만복,이계은,Park Sang-Hyun,Chun Man-Bok,Lee Kye-Eun 한국관개배수위원회 2000 한국관개배수논문집 Vol.7 No.2
A hydraulic model study have been carried out on roughness coefficient of corrugated helical steel pipe. The study was performed in the 0.6m wide flume of Hydraulic Laboratory for the pipe diameter of 0.6m and 1.6m. Additional study was performed in 2m wi
문상호,김병목,이계은 한국멀티미디어학회 2020 멀티미디어학회논문지 Vol.23 No.5
Buildings are becoming more and more high-rise and large-scale in recent years, so in the event of a disaster such as a fire, enormous human and economic damage is expected. Therefore, management, security, and fire control are essential for large buildings in the city. Because these large buildings are very complex outside and inside, they need a three-dimensional control based on 3D modeling rather than a simple flat-oriented control. To do this, this paper designed and implemented a building control system based on 3D modeling. Specifically, we designed a 3D building / facility editing module for 3D modeling of buildings, a 3D based control module for building control, and a linkage module that connects information such as firefighting equipment, electrical equipment and IoT equipment. Based on this design, a building control system based on 3D modeling was implemented.
이철규,문상호,이상규,이계은 한국멀티미디어학회 2019 멀티미디어학회논문지 Vol.22 No.2
In order to reflect complex and diverse building types, resident characteristics and disaster factors, it is necessary to introduce a flexible situation-based response system based on real-time information. Intelligent CCTV, hybrid sensor, location scanner, and customized broadcasting device were examined to introduce for the real-time response intelligent response system and its feasibility was verified through field test. In addition, based on the real-time information, the evacuation simulation was executed by assuming the dormitory building and the resident of the school, and the safety of the evacuation and the shortening of the pinnacle time were confirmed. The feasibility of real time information based evacuation comparing with the existing evacuation system were verified in the case of evacuation.
김나영 ( Na Young Kim ),이계은 ( Kye Eun Lee ),조영준 ( Young Jun Cho ),이동률 ( Dong Ryul Lee ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
Gasoline Direct Injection (GDI) has been researched for reducing fuel consumption and high combustion response. Since injection rate is one of key parameters of GDI engine performances, precise control of injection rate and reliable modeling are important. In the present study, injection rates of GDI injector are modeled by 1-D, 3-D simulations. Simulated results are validated against experimental results. Injector needle dynamic movement was calculated by AMESim 1-D simulation. Using needle dynamic movement, injection rate was calculated by CFD (Computational fluid dynamics), Stat-CCM+. Comparing simulation and experimental results indicates that predicted injection rate using 1-D, 3-D simulation can effectively estimate.
Tumoral calcinosis and calciphylaxis treated with subtotal parathyroidectomy and sodium thiosulphate
조현정,이용진,강은정,박석우,조은진,조성태,이계은,오국환 영남대학교 의과대학 2016 Yeungnam University Journal of Medicine Vol.33 No.1
Tumoral calcinosis (TC) is a condition resulting from extensive calcium phosphate precipitation, primarily in the periarticular tissues around major joints. Calciphylaxis is a fatal ischemic vasculopathy mainly affecting dermal blood vessels and subcutaneous fat. This syndrome is rare and predominantly occurs in patients with end-stage renal disease. Here, we report on a rare case involving a patient with TC complicated with calciphylaxis. Our patient was a 31-year-old man undergoing hemodialysis who presented with masses on both shoulders and necrotic cutaneous ulcers, which were associated with secondary hyperparathyroidism, on his lower legs. He underwent subtotal parathyroidectomy, and sodium thiosulfate (STS) was administered for 27 weeks. Twenty months after beginning the STS treatment course, he experienced dramatic relief of his TC and calciphylaxis.