http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
S 대역 Diplexer에 대한 Multipactor 민감도 시험
최승운(Seung-Woon Choi),김대영(Day-Young Kim),권기호(Ki-Ho Kwon),이윤기(Yun-Ki Lee) 한국항공우주연구원 2007 항공우주기술 Vol.6 No.1
위성용 RF 수동 소자에 대한 MP(multipactor) 현상과 그 검출 방법에 대한 연구를 수행하였으며, 본 연구에 사용된 RF 수동 소자는 S 대역 diplexer로, 이는 인터디지털 타입의 5단 chebyshev 응답특성을 갖는 두개의 대역통과필터로 구성되며 2.232 및 2.055 ㎓ 대역에서 2.7 %의 대역폭을 갖는 구조로 각각 설계되었다. MP 민감도 해석을 위해 diplexer에 대하여 3D 전자기 모델링을 수행하였으며, 이를 통하여 diplexer 구조적으로 multipactor에 대하여 가장 민감한 부분을 정의 하였고 이때의 MP 방전 현상이 나타나지 않는 최대 RF 입력전력을 규명하였다. 또한 KARI 자체 개발한 MP 민감도 시험 시설을 이용하여 QM용 diplexer에 대한 시험을 수행하였으며, 그 결과 CW 모드에서 43 ㏈m, 펄스 모드 시험에서 44 ㏈m의 RF 입력 전력에서 MP가 발생됨을 확인 하였다. An experimental verification of multipactor(MP) discharge for S-band diplexer as a sample DUT for space application by an in-house MP test facility is proposed. The designed diplexer having two BPFs for Rx and Tx is applied to a design of five pole inter-digital cavity type band pass filter with chebyshev response, it has 2.7 % bandwidth centered at 2.232 and 2.055 ㎓ for Rx, Tx, respectively. To avoid the MP discharge, the accurate design and analysis methods based on 3D EM field analysis are considered. The proposed in-house MP test facility consists of a phase detecting system using a doubly balanced mixer as a simple, low cost and real time MP test method compared with results of previously well-known MP detection systems as cross reference methods. The calculated MP threshold RF input power is 43.13 ㏈m. The measured one is 43 ㏈m and 44 ㏈m for CW, pulsed mode test, respectively.
국립공원 방문객의 탐방동기가 만족도 및 행동의도에 미치는 영향
최영석(Choi, Young-Seok),최승운(Choi, Seung-Woon),유기준(Yoo, Ki-Joon) 한국산림휴양복지학회 2020 한국산림휴양학회지 Vol.24 No.3
본 연구의 목적은 국립공원 방문객의 탐방동기가 만족도 및 행동의도에 미치는 영향을 분석하는데 있다. 연구목적 달성을 위해 문헌연구를 토대로 연구모형 및 가설을 설정하였으며, 북한산과 치악산 국립공원 방문객을 대상으로 실증분석을 실시하였다. 분석결과, 국립공원 탐방동기 구성요인으로 도전성, 휴식성, 교육성, 자연성, 가족성, 관계성, 성찰성, 건강성, 치유성의 9개 요인이 도출되었다. 또한, ‘국립공원 방문객의 탐방동기는 만족도에 영향을 미칠 것이다’의 <연구가설 1>은 부분적으로 지지되었으며, ‘국립공원 방문객의 만족도는 행동의도에 영향을 미칠 것이다’의 <연구가설 2>는 지지되었다. 본 연구에서는 탐방동기, 만족도 및 행동의도에 대한 연구의 모형을 설정된 가설의 통계적 검증을 통해 확인하였다는 점과 연구과정에서 COVID-19의 돌발적 상황에서 치유성 요인이 새롭게 도출되었다는데 연구의 성과가 있다. The purpose of this study is to analyze the effect of visitors’ visit motivation on satisfaction and behavioral intention. In order to achieve the research objectives, a research model and hypotheses were established based on literature review, and an empirical analysis was conducted for visitors in Bukhansan and Chiaksan national parks. As a result of the analysis, nine factors were derived as the constituent factors of the national park visit motivation: challenges, relaxation, education, nature, family, relationships, reflection, health, healing. In addition, 〈Research Hypothesis 1〉 that ‘national park visitor’s visitor motivation will affect satisfaction’ was partially adopted, and 〈Research Hypothesis 2〉 that ‘national park visitor satisfaction will affect behavior intention’ was adopted. In this study, a research model on visit motivation, satisfaction, and behavioral intention was confirmed through statistical verification of established hypotheses. In addition, the research has significance in that a new healing factor was derived from the COVID-19 situation during the research process.
이상진,박홍철,박관수,김현숙,이창민,김진원,심규원,최승운,Lee, Sang-Jin,Park, Hong-Chul,Park, Gwan-Soo,Kim, Hyoun-Sook,Lee, Chang-Min,Kim, Jin-Won,Sim, Gyu-Won,Choi, Seung-Woon 한국환경복원기술학회 2022 한국환경복원기술학회지 Vol.25 No.3
The purpose of this study is to quantitatively evaluate the amount of carbon storage for trees in forest ecosystem to support the foundation for carbon neutrality implementation in Korea National Park. It targeted 22 national parks designated and managed as national parks in Korea, and conducted research on forest trees in the terrestrial ecosystem among various natural and ecological carbon sink. The survey and analysis method followed the IPCC guidelines and the National Greenhouse Gas Inventory in Korea. The amount of tree carbon storage in the forest ecosystem of Korea National Park was confirmed to be about 218,505 thousand CO<sub>2</sub>-ton and the amount of carbon storage per unit area was 570.8 CO<sub>2</sub>-ton per hectare. Compared to 299.7 CO<sub>2</sub>-ton per hectare, the average carbon storage per unit area of the entire Korean forest, it was found that about twice as much carbon was stored when assuming the same area. In other words, it means that the tree carbon storage function of the national park is about twice as high as that of the average tree carbon storage function of entire Korean forest. It has great implications in Korea National Park not only provides biodiversity promotion and exploration services as a national protected area, but also performs excellent functions as a carbon sink.
두부손상을 동반한 다발성 외상환자에서 중증도 평가지표로서 염기결핍의 유용성
김봉주 ( Bong Joo Kim ),강태경 ( Tae Kyung Kang ),최승운 ( Seung Woon Choi ),김혜진 ( Hye Jin Kim ),오성찬 ( Sung Chan Oh ),조석진 ( Suk Jin Cho ),류석용 ( Seok Yong Ryu ) 대한외상학회 2012 大韓外傷學會誌 Vol.25 No.4
Purpose: The arterial base deficit and the serum lactate level are widely recognized indicators of injury severity, adequacy of resuscitation and outcome. The purpose of this study is to evaluate the usefulness of the arterial base deficit as an injury-severity indicator in multiple-trauma patients with head injuries. Methods: Data were retrospectively collected from trauma patients over 18 years of age who had been admitted at the emergency center between October 2005 and July 2006. The patients were divided into headinjury and non-head-injury groups. These patients were then sub-divided into minor (ISS≤15)-injury and major (ISS≥16)-injury groups according to their injury severity scores (ISS). We analyzed the differences in the base deficits and the serum lactate levels between the major- and the minor-injury sub-groups in both the head-injury and the non-head-injury groups. Results: In the non-head-injury group, we found statistically significant differences in the arterial base deficit between the major-injury and the minor-injury sub-groups(-6.86±2.40mmol/L vs. -1.37±0.73mmol/L, p=0.010). In the head-injury group, no significant differences were noted between the two sub-groups(-2.50±1.28mmol/L vs. -1.51±0.74mmol/L, p=0.897). Moreover, the differences in arterial base deficit between the major-injury and the minor-injury sub-groups were not significant both for either single-head-trauma or multiple-head-trauma patients (p=0.643 vs. p=0.832). Conclusion: We conclude that neither the arterial base deficit nor the serum lactate level can be used to predict injury severity in multiple-trauma patients with head injuries. (J Trauma Inj 2012;25:223-229)