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정주현 ( Joohyun Jung ),양형석 ( Hyungsuk Yang ),한승민 ( Seungmin Han ),윤동학 ( Dong Hak Yoon ),김승태 ( Seungtae Kim ) 경락경혈학회 2023 Korean Journal of Acupuncture Vol.40 No.4
Objectives : Hapgok (LI4) is one of the most widely used acupoints in clinical practice. This study aims to investigate the trend of clinical studies including LI4 acupoint stimulation in Korea. Methods : Papers of clinical researches including LI4 acupoint stimulation in Korean journals were searched in Korean databases of Korean Traditional Knowledge Portal, Korean Studies Information Service System, Korea Citation Index, DBpia, Research Information Sharing Service, and ScienceON. The papers were then analyzed focusing on the number of publications by year, the types of the clinical research, interventions, research topics, institutes, and journals. Results : A total of 154 publications were included in this study. The first paper was published in 1981, and the number of papers has gradually increased since the 1990s. Although LI4 acupoint stimulation was included, most of the papers had additional acupoints and interventions. Diseases of the nervous system were the most common, followed by diseases of the digestive system and diseases of the circulatory system. Kyung Hee University is the institution that published the most papers, and the journal that published the most papers is The Journal of Korean Oriental Internal Medicine. Conclusions : Since the 1990s, the number of clinical studies on LI4 acupoint has increased. However, the results of the studies are insufficient to prove the efficacy of LI4 acupoint because most of the studies were case reports using additional acupoints and interventions. Therefore, more rigorous studies are needed to prove the efficacy of LI4 acupoint.
21T 초전도 자석을 위한 저온 유지 장치의 개념 설계
이병섭(Byoung-Seob Lee),김동락(Dong-Lak Kim),양형석(HyungSuk Yang),최연석(Yeon Suk Choi),유종신(Jong Shin Yoo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The superconducting solenoid magnets for high energy physics, bio-technology, nano-technology and medical system use the cryostat to keep superconductivity for themselves and KBSI is starting on a journey for FT-ICR MS development with 21T superconducting magnet, therefore we progressed the conceptual design of cryostat above all. According to advance of investigation in conceptual design, we produced some results and discussed how to deal with design parameter. The results is considered thermal load related on heat invasion due to conduction and radiation and is used to estimate structural stress, thermal stress, contraction due to drops in temperature of cryostat. Also, we reached our object about durations of operation (the duration of LN2 refill is 7 days and the duration of LHe refill is 60 days). But, we feel the need of investigation more detailed cryostat design of 21T superconducting magnet.
수평형 고자기장 초전도 자석용 크라이오스텟의 지지구조물 하중 완화 방법
이병섭(Byoung-Seob Lee),김동락(Dong-Lak Kim),최연석(Yeon Suk Choi),양형석(HyungSuk Yang),신필권(Phil Kwon Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The study related on support system of cryostat for 21 T horizontal type superconducting magnet is presented. Especially, the deformation behavior of cryostat under magnetic field and thermal contractions at cryogenic temperatures is dealt with the analytical method related on Finite Element Analysis. From the results, we know that the strain by self weight and thermal contraction contribute to serious damage. Also, we will introduce about weight relief design for the structural integrity of support system.
정원묵(Won-Moog Jung),김동락(Dong-Lak Kim),양형석(HyungSuk Yang),이병섭(Byoung-Seob Lee),황시돌(Si-Dole Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
MLI(Multi-Layer Insulation) is widely used to get highly insulating efficiency on cryogenic system in order to reduce heat loads. In this study, The heat loads from the environment for an annular cylinder cryostat such as HTS(High Temperature Superconducting) power cable system were measured by liquid nitrogen boil-off calorimetry for investigating the thermal characteristics on MLI. The cryostat consists of test vessel and two guard vessels which located at both end sides of test vessel. In order to prevent radiation heat load through the both end sides of the test vessel, the guard vessels are filled with liquid nitrogen. The measured heat loads are compared with the calculated them.