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2 kW급 브레이튼 냉동기용 열역학 사이클 및 극저온 터보 팽창기 설계
이진우,이창형,양형석,김석호,Lee, Jinwoo,Lee, Changhyeong,Yang, Hyeongseok,Kim, Seokho 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.2
초전도 전력 케이블의 상용화 노력에 따라 점차 장선화 되면서, 단위 냉각 시스템당 냉각용량이 큰 대용량 냉동기의 필요성이 증가하고 있다. 국내에서는 극저온 냉동기에 대한 기술 부족으로 인해 현재 극저온 냉동기는 해외 선진사로부터 고가의 비용으로 수입되고 있다. 초전도 전력 케이블의 상용화를 위해서는 대용량 브레이튼 냉동기의 국내 개발이 시급하다. 대용량 브레이튼 냉동기의 구성은 복열식 열교환기, 압축기, 극저온 터보 팽창기로 구성되어 있으며, 냉동기 효율과 가장 직접적인 연관이 있는 것은 극저온 터보 팽창기이다. 극저온 터보 팽창기는 극저온에서 고속으로 회전하면서 고압의 헬륨 혹은 네온 가스를 팽창시켜 온도를 낮추는 역할을 한다. 본 논문에서는 역브레이튼 냉동 사이클을 설계하고, 이에 적합한 극저온 터보 팽창기를 설계하였다. The High Temperature Superconducting power cables (HTS power cables) become increasingly longer to commercialize the HTS power cable system. Accordingly, demands on refrigerators of large cooling capacity per a unit system have been increased. In Korea, it is currently imported from abroad with the high price due to insufficient domestic technologies. In order to commercialize the HTS power cables, it is necessary to develop the refrigerators with large cooling capacity. The Brayton refrigerators are composed of recuperative heat exchangers, compressors and cryogenic turbo expanders. The most directly considering the efficiency of the Brayton refrigerator, it depends on performance of the cryogenic turbo expander. Rotating at high speed in cryogenic temperature, the cryogenic turbo expanders lower temperature by expanding high pressure of a helium or neon gas. In this paper, the reverse Brayton cycle is designed and the cryogenic turbo expander is designed in accordance with the thermodynamic cycle.
무인 지상 차량 네트워크에서 GPS 재밍에 강인한 위치기반 라우팅
이진우,정우성,김용주,고영배,함재현,최증원,Lee, Jinwoo,Jung, Woo-Sung,Kim, Yong-joo,Ko, Young-Bae,Ham, Jae-Hyun,Choi, Jeung-Won 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4
UGVs(Unmanned Ground Vehicles) are robots that can substitute humans in reconnaissance operations of potentially dangerous and contaminated sites. Currently, there have been active research on utilizing UGVs in military environments. Much resrach has been focused on exploiting the weakness of topology-based routing and instead utilize location-based routing for the networking of UGVs. It is generally assumed that location-based routing methods can fully utilize the location information gained from GPS. However, this may not be possible in tactical environments due to enemy GPS jamming and LOS(Line of Sight) limitations. To solve this problem, we propose a location-based routing scheme utilizing low control message that can calibrate the location information using GPS information as well as location of neighboring UGV, movement direct and speed information. Also utilizing topology-based routing scheme to solve incorrect location information in GPS jamming region.
이진우,Lee, Jinwoo 한국병원경영학회 2017 병원경영학회지 Vol.22 No.3
The purpose of this study is to analyze the difference of productivity according to environmental factors among 25 Regional base public hospitals. Also this study is to propose a method to improve the productivity of Regional base public hospitals in the future by improving the public performance and stable management performance by studying the productivity variables affecting profitability. The survey period was based on the last three years, and 25 Regional base public hospitals were selected for the survey. The dependent variable is the total capital medical marginal profitability and the medical profit marginal profitability which are the indicators of profitability. The independent variable, productivity, is classified into three indicators: capital productivity, labor productivity, and value added productivity. The ANOVA analysis method was used to analyze the productivity difference according to the frequency factor and the environmental factors of the Regional base public hospitals. Finally, we conducted a hierarchical regression analysis to examine the productivity variables affecting profitability. The results of this study showed that there were differences in productivity due to environmental factors such as hospital size, competition in the local medical market, and differences in management performance. The difference in productivity and profitability depending on the environmental factors suggests that it is difficult for Regional base public hospitals in each regional base to perform a balanced public service. In order to overcome this, it is necessary to provide balanced medical services such as government financial support expansion, regional medical demand forecasting and facility infrastructure construction.
연료분무 및 연소 1 : 연료 온도가 디젤 인젝터의 유량 및 분무 발달 과정에 미치는 영향에 관한 연구
이진우 ( Jinwoo Lee ),표순찬 ( Soonchan Pyo ),배충식 ( Choongsik Bae ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
The characteristics of fuel quantity, injection rate and macro spray pattern including flame development was investigated under various diesel fuel temperature. Real injection quantity showed decreasing tendency despite of the same signal of start of injection and injection duration as the fuel temperature decreased. Injection rate measurement verified that the real start of injection was delayed and the real injection duration was shortened with lower fuel temperature condition, which explains the reason why injection quantity decreased. Spray tip penetration with lower fuel temperature was longer than that with higher fuel temperature due to deteriorated atomization. From the combustion visualization, it was revealed that irregular flame pattern from each injector hole was shown with low flame intensity with low fuel temperature condition. To overcome combustion process under cold temperature condition, multiple injection strategy was applied with single and double pilot injections. Overall heat release rate was increased with multiple injection strategy with higher luminosity intensity. However, more careful application with multiple injections is need under cold ambient condition due to the concern of high HC emission. More results related with fuel temperature will be presented further during the conference.