http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hyung-Chul Lim,Sung-Yeol Yu,Ki-Pyoung Sung,Jong Uk Park,Chul-Sung Choi,Mansoo Choi 한국우주과학회 2020 Journal of Astronomy and Space Sciences Vol.37 No.4
A CubeSat platform has become a popular choice due to inexpensive commercial off-the-shelf (COTS) components and low launch cost. However, it requires more power-efficient and higher-data rate downlink capability for space applications related to remote sensing. In addition, the platform is limited by the size, weight and power (SWaP) constraints as well as the regulatory issue of licensing the radio frequency (RF) spectrum. The requirements and limitations have put optical communications on promising alternatives to RF communications for a CubeSat platform, owing to the power efficiency and high data rate as well as the license free spectrum. In this study, we analyzed the performance of optical downlink communications compatible with CubeSat platforms in terms of data rate, bit error rate (BER) and outage probability. Mathematical models of BER and outage probability were derived based on not only the log-normal model of atmospheric turbulence but also a transmitter with a finite extinction ratio. Given the fixed slot width, the optimal guard time and modulation orders were chosen to achieve the target data rate. And the two performance metrics, BER and outage data rate, were analyzed and discussed with respect to beam divergence angle, scintillation index and zenith angle.
Study on the Optoelectronic Design for Korean Mobile Satellite Laser Ranging System
Lim, Hyung-Chul,Bang, Seong-Cheol,Yu, Sung-Yeol,Seo, Yoon-Kyung,Park, Eun-Seo,Kim, Kwang-Dong,Nah, Ja-Kyoung,Jang, Jeong-Gyun,Jang, Bi-Ho,Park, Jang-Hyun,Park, Jong-Uk 한국우주과학회 2011 Journal of Astronomy and Space Sciences Vol.28 No.2
무대공포증과 연관된 프로프라놀롤 복용과 스트레스 대처방식의 관련성: 예술고등학교 음악 전공 학생들을 대상으로
윤동욱(Dong-Uk Yoon),송병아(Byeong-a Song),이형준(Hyung-Jun Lee),유은라(Eun-ra Yu) 대한스트레스학회 2021 스트레스硏究 Vol.29 No.4
본 연구는 예술고등학교 학생들의 무대공포증과 연관된 프로프라놀롤 복용과 스트레스 대처방식의 관련성을 연구하고자 하였다. 먼저 스트레스 대처방식 유형을 두 집단으로 구분한 뒤, 각 집단별 특징과 프로프라놀롤 복용 여부와 관련된 연관요인의 차이를 확인하고자 하였다. 적극적 대처군이 62.4%로 소극적 대처군인 37.6%보다 많았으며 남학생이 여학생보다 적극적 대처를 하는 비율이 유의하게 높았다. 소극적 대처군의 경우 무대공포, 완벽주의, 불안, 회피가 유의하게 높았다. 프로프라놀롤 복용군은 미복용군에 비해 연습시간이 많았으며, 적극적 대처군에서 프로프라놀롤의 복용 여부와 연습시간은 양의 상관관계였으며, 소극적 대처군에서는 프로프라놀롤의 복용 여부와 회피 반응은 음의 상관관계였다. 향후 무대공포증 극복를 위한 치료개입방안과 프로프라놀롤 오남용 관련 연구와 예방이 필요할 것이다. Background: In order to verify the effect of taking propranolol to overcome music performance anxiety in art high school students, Lazarus and Folkman’s stress coping models were applied to classify stress coping types into active and passive coping groups and determine what factors influenced whether or not propranolol was taken. Methods: Descriptive statistics analysis was conducted to identify the general characteristics of 394 art high school students. Chi-square test and independent t-test were conducted to verify the difference between music performance anxiety and related factors according to the stress coping model. Binary logistic regression analysis was performed to analyze the factors influencing whether propranolol was taken according to the stress coping model. Results: The active coping group were higher at 62.4% compared to the 37.6% of the passive coping group. Male students had a significantly higher rate of active response than females. In the case of the passive coping group, music performance anxiety, perfectionism, anxiety, and avoidance were significantly higher. The propranolol-dosing group had more practice time than the non-dosing group. The active coping group showed a positive correlation with the practice time according to whether propranolol was taken, and the passive coping group showed a negative correlation with avoidance. Conclusions: It was confirmed that the use of propranolol to overcome music performance anxiety differed according to the stress coping model. Clinical suggestions were presented for the need for cognitive behavioral therapy on intervention measures to overcome music performance anxiety.
공동주택 통계적 모델을 이용한 단위난방부하의 지역별 설정 연구
김원욱(Won Uk Kim),엄지영(Ji Young Eum),유기형(Ki Hyung Yu),김용기(Yong Ki Kim) 한국퍼실리티매니지먼트학회 2017 한국퍼실리티매니지먼트학회지 Vol.12 No.2
This study developed the apartment reference model based on the building design trends for calculating the peak heating load. The building design trends were resulted from new apartment buildings of the Performance Evaluation of Eco-friendly Homes from 2012 to 2015. The reference model has the surface area of envelope, 97.5% of those of dataset, the model was validated by those of new apartment buildings in Sejong city. The peak heating load of the reference model in 59 Korean cities were calculated using RTS-SAREK program with the indoor/outdoor temperature and the regional thermal insulation performance of energy-saving design standards. The peak heating load of the 59, 74, 84 ㎡ apartment model is 50.2, 48.2 and 47.2 W/㎡ in the central region, 52, 49.8 and 48.7 W/㎡ in the southern region, and 40.4, 38.6 and 37.6 W/㎡ in the Jeju region, respectively. The peak heating loads of the model with 59 cities show that the regional division need to be divided into more regions and cities have to be rearranged to evaluate energy-saving properly.
김준형 ( Jun Hyung Kim ),민성욱 ( Seong Uk Min ),최유성 ( Yu Sung Choi ),서대헌 ( Dae Hun Suh ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.11
Infantile acne is a much less common disease than adolescent and postadolescent acne. It occurs in children approximately at 3 to 6 months of age. An 8 month-old male infant, accompanied by his mother, visited our clinic with a history of erythematous skin lesions on both cheeks, which started 5 months ago. Physical examination revealed closed comedones, several relatively well demarcated, erythematous papules, nodules and pustules. Inflammatory lesions left scars scattered over the face. For further evaluation of endocrinologic abnormalities or other systemic diseases, an additional abdominal ultrasound was done after a visit to the pediatrician. A skin biopsy revealed findings compatible with acne. Skin lesions were improved by treatment with oral and topical antibiotics, adapalene and isotretinoin. We report herein a case of infantile acne which has not been reported in Korean dermatological literature. (Korean J Dermatol 2007;45(11):1173∼1175)