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항공기용 전기-정유압식 작동기(Dual Redundant Asymmetric Tandem EHA)의 열특성 예측을 위한 연구
김상석,박형준,김대연,김대현,김상범,이준원,최종윤,Kim, Sang Seok,Park, Hyung Jun,Kim, Daeyeon,Kim, Dae Hyun,Kim, Sang Beom,Lee, Junwon,Choi, Jong Yoon 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.3
The electro-hydrostatic actuator (EHA) recently has been used in flight control fields for aircraft because of its benefits of minimizing oil leakage and weight, improving safety, and etc. while independently operating the hydraulic power source and eliminating complex hydraulic piping. The aircraft of which EHA is installed inside, has the thermal management issue of EHA, because of its limited cooling source as compared with the aircraft which installs the traditional central hydraulic system. So, the thermal analysis model which predicts the thermal characteristics of EHA, is required to resolve this thermal management issue. In this study, an oil circulation circuit inside the hydraulic power module comprised of hydraulic pump and electrical motor for EHA was applied. This is for the purpose of developing the internal rotary group of hydraulic power module, which operates under the conditions of high rotation speed and hydraulic pressure. After formulating an appropriate thermal analysis model, the thermal analysis results with oil cooled or no oil cooled hydraulic control module were compared and reviewed, for the purpose of predicting the thermal characteristics of EHA.
한국에서 시행된 각막인레이 삽입술의 초기 임상결과 보고
김문경(Moon Kyoung Kim),이제훈(Jei Hoon Lee),박시윤(Si Yoon Park),지용우(Yong Woo Ji),이형근(Hyung Keun Lee),서경률(Kyoung Yul Seo),김응권(Eung Kweon Kim),김태임(Tae-im Kim) 대한검안학회 2016 Annals of optometry and contact lens Vol.15 No.2
Purpose: To evaluate clinical outcomes after implantation of a corneal hydrogel inlay (Raindrop Near Vision Inlay) with concurrently performing laser in situ keratomileusis (LASIK) to correct presbyopia Methods: Raindrop inlay (ReVision Optics, Inc., Lake Forest, CA, USA) was implanted at non-dominant eyes of 10 patients with presbyopia. Concurrent LASIK was performed for patients who have refractive error. Ophthalmologic evaluation included visual acuities at near, intermediate and far distance, higher-order aberration and complication cases. Subjective satisfaction was assessed by patient questionnaire. Results: Compared to preoperative visual acuity, uncorrected near vision acuity (p=0.045) and far vision acuity (p=0.126) of inlay implanted eye was improved at one year after operation. There was no significant difference in the RMS total, coma and trefoil aberration between pre-operative and six month post-operative values. Almost patients were satisfied with task assessment at near, intermediate and far distance. However, two patients removed inlay at six months after operation due to subjective discomfort and another two patients removed inlay at one year after operation due to myopic shift. Conclusions: Raindrop inlay implantation with concurrent LASIK effectively correct presbyopia. However, further long-term investigation about subjective discomfort and refraction change should be needed for confirmation of efficacy and safety.
김주필(Joo Pil Kim),최한석(Han Seak Choi),김대희(Dae Hee Kim),지승환(Seung Hwan Ji),이형민(Hyung Min Lee),변진관(Jean Koan Byun),이형진(Hyung Jeen Lee),조형진(Hyung Jeen Jo),한정혁(Jung Huk Han),이태후(Tae Hoo Lee),조윤규(Yoon Kyu Jo 한국거미연구소 2018 한국거미 Vol.34 No.2
2018년 7월 26일부터 28일까지 울릉도 나리분지, 독도 지역을 주야로 한국거미연구회 회원 17명(김주필, 최한석, 김대희, 지승환, 이형민, 변진관, 조형진, 이형진, 이태후, 한정혁, 조윤규, 조원규, 이현동, 이윤정, 조용하, 윤혜원, 이용화)이 채집한 결과 20과 43속 60종이 채집되어 이에 보고 발표하는 바이다. From July 26 to 28 in 2018. Koran Arachnological Study members investigated the Spiders in the Ulleung Island (Gyeongsangbuk-do, Ulleung-gun), and reported 20 Families, 43 Genus 60 Species of spiders. The collected spiders are placed (stored) in the Joo-Pil Spider museum.
김주필(Joo Pil Kim),지승환(Seung Hwan Ji),이형민(Hyung Min Lee) 한국거미연구소 2017 한국거미 Vol.33 No.1
2016년 7월 23일부터 24일, 8월 13일, 2회 한국거미연구회 회원 김주필, 지승환, 이형민 등이 서울특별시 영등포구 한강내의 밤섬을 채집조사한 결과 12과, 29속, 45종의 거미류가 조사 연구되어 이에 보고하는 바이다. The author investigated the spiders of Barn island in July 23~24.2016, August 13, 2016. In the present paper 45 species of 29 genera belongs to 12 families were identified. These specimens are deposited at the Joo-Pil Spider Museum, Namyangju-Si, Gyeonggi-Do.