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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.
코로나19와 한국 사회: 극한의 상황에서 드러나는 문화적 경계선과 생명정치
이진우(Lee, Jinwoo) 경상대학교 사회과학연구원(사회과학연구) 2020 사회과학연구 Vol.36 No.-
Cultural reaction towards a certain extreme event shows the ‘borders’ of the society, regardless of it being explicit or implicit. This study tries to provide insights through understanding Korean society by analyzing its responses toward major mass infection events of COVID-19. First mass infection involves Shincheonji, one of new religious movement in Korea. Mysterious features of Shincheonji and its leader Lee, Man-hee have piqued social interest, leading to harsh criticism and dubious claims unrelated to the pandemic. Second mass infection happened in Itaewon regarding a homosexual club. Strategies homosexuals used to conceal their social stigmas hindered investigation and response. Discrimination and hatred towards homosexuality, preexisting but implicit, reemerged under the guise of rational criticism. Meanwhile, the guidelines of social distancing shows the state’s perception towards necessity and excess. While most economic activities are considered extremely vital, those regarding entertainment are deemed excessive and even excluded from economic support from the government. The third mass infection originated from the political demonstration against the current government. Masks and cell phones, two essential objects for successful quarantine, are understood by some as symbols of suppression. The possibility of political use of quarantine to silence criticism has also been raised. Biopolitical analysis interprets this phenomenon as an inevitable absolutization of sovereignty and social retaliation against it. In conclusion, this study suggests the irony of utilizing absolute authority to construct democratic pluralism as the only solid option to successfully overcome the COVID-19 crisis.
디젤 인젝터 분사율 예측을 위한 AMESim 기반 1-D 모델 구축
이진우 ( Jinwoo Lee ),김재헌 ( Jaeheun Kim ),김기현 ( Kihyun Kim ),문석수 ( Seoksu Moon ),강진석 ( Jinsuk Kang ),한상욱 ( Sangwook Han ) 한국액체미립화학회 2020 한국액체미립화학회지 Vol.25 No.1
Recently, 1-D model-based engine development using virtual engine system is getting more attention than experimental-based engine development due to the advantages in time and cost. Injection rate profile is the one of the main parameters that determine the start and end of combustion. Therefore, it is essential to set up a sophisticated model to accurately predict the injection rate as starting point of virtual engine system. In this research, procedure of 1-D model setup based on AMESim is introduced to predict the dynamic behavior and injection rate of diesel injector. As a first step, detailed 3D cross-sectional drawing of the injector was achieved, which can be done with help of precision measurement system. Then an approximate AMESim model was provided based on the 3D drawing, which is composed of three part such as solenoid part, control chamber part and needle and nozzle orifice part. However, validation results in terms of total injection quantity showed some errors over the acceptable level. Therefore, experimental work including needle movement visualization, solenoid part analysis and flow characteristics of injector part was performed together to provide more accuracy of 1-D model. Finally, 1-D model with the accuracy of less than 10% of error compared with experimental result in terms of injection quantity and injection rate shape under normal temperature and single injection condition was established. Further work considering fuel temperature and multiple injection will be performed.