• Title/Summary/Keyword: Kim Won-wu

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On Orbit Data Analysis About the Passive Cooling of MIRIS, a Compact Space Infrared Telescope

  • Lee, Duk-Hang;Moon, Bongkon;Jeong, Woong-Seob;Pyo, Jeonghyun;Lee, Chol;Kim, Son-Goo;Park, Youngsik;Lee, Dae-Hee;Park, Sung-Joon;Kim, Il-Joong;Park, Won-Kee;Seon, Kwang-Il;Nam, Uk-Won;Cha, Sang-Mok;Park, Kwijong;Park, Jang-Hyun;Yuk, In-Soo;Ree, Chang Hee;Jin, Ho;Yang, Sun Choel;Park, Hong-Young;Shin, Ku-Whan;Suh, Jeong-Ki;Rhee, Seung-Wu;Park, Jong-Oh;Lee, Hyung Mok;Matsumoto, Toshio;Han, Wonyong
    • The Bulletin of The Korean Astronomical Society
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    • v.39 no.1
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    • pp.50.1-50.1
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    • 2014
  • The Multi-purpose InfraRed Imaging System (MIRIS) is the main payload of Science and Technology Satellite 3 (STSAT-3), which was launched onboard Dnepr rocket from Russian Yasny Launch Base in November 2013. The MIRIS is an infrared (IR) camera, and the telescope has to be cooled down to below 200K in order to reduce thermal background noise. For the effective cooling and low-power consumption, we applied passive cooling method to the thermal design of the MIRIS. We also conducted thermal analysis and tested for the passive cooling before the launch of STSAT-3. After the launch, we have received State-of-Health (SOH) data from the satellite on orbit, including temperature monitoring results. It is important that the temperature of the telescope was shown to be cooled down to below 200K. In this paper, we present both the temperature data of the MIRIS on orbit and the thermal analysis results in the laboratory. We also compare these results and discuss the verification of the passive cooling.

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Field Performance of Reinforced Earth Wall with Steel Framed-Facing (강재틀 보강토옹벽에 대한 현장 시험시공)

  • Lee, Kwang-Wu;Cho, Sam-Deok;Kim, Ju-Hyong;Seo, Chang-Won
    • Journal of the Korean Geosynthetics Society
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    • v.6 no.4
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    • pp.39-48
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    • 2007
  • This paper introduces a recently developed reinforced earth wall system with steel framed-facing. The new system incorporates a steel-framed facing that might be assembled on-site and steel strip or geogrid type reinforcements for backfill area. In order to enhance scenery view design of the wall construction, dual-structured facing is proposed in which room for planting space locates in the front of facing. A reinforced earth walls using the proposed system was constructed to verify constructability of the proposed system and facing movement and tensile characteristics of reinforcement were measured to understand the mechanical behavior.

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The Immediate Effects of Posterior Pelvic Tilt with Taping on Pelvic Inclination, Gait Function and Balance in Chronic Stroke Patients

  • Wu, Yang-Ting;Choe, Yu-Won;Peng, Cheng;Kim, Myoung-Kwon
    • Journal of the Korean Society of Physical Medicine
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    • v.12 no.3
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    • pp.11-21
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    • 2017
  • PURPOSE: The purpose of this study is to identify the immediate effect of posterior pelvic tilt taping on anterior pelvic inclination, gait function, and balance in chronic stroke patients. METHODS: Fourteen chronic stroke subjects were enrolled in this study. Subjects who consented to participate in this cross-over experiment were assigned three interventions: posterior pelvic tilt taping, placebo taping, and no taping, in random order. After tape application, subjects were asked to complete: 1) Anterior pelvic tilt measurement, 2) 10-Meter Walk test, and 3) Limits of stability (LOS) test. To eliminate the learning effect of the tape after tearing off the tape, a 10 minute break was given between posterior pelvic tilt taping intervention and placebo taping intervention. RESULTS: Significant decreases were observed for the anterior pelvic inclination on both sides after posterior pelvic tilt taping application compared with placebo taping and no taping application (p<.05). Post hoc test results differed significantly in the 10-meter walk test after intervention (p<.05). However, there were no significant differences in limits of stability test after intervention (p>.05). CONCLUSION: Posterior pelvic tilt taping in chronic stroke patients decreases the inappropriate anterior pelvic inclination immediately and improves gait function, but it has little effect on balance.

Effects of Bridge Exercise with Pelvic Compression Belt on Electromyographic Activities of Selected Lumbopelvic Muscles in Young Adults with Lumbar Instability

  • Cha, Hyun-Gyu;Choe, Yu-Won;Wu, Yan-Ting;Kim, Myoung-Kwon
    • Journal of the Korean Society of Physical Medicine
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    • v.12 no.3
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    • pp.1-10
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    • 2017
  • PURPOSE: This study assessed the effect of the pelvic compression belt on the electromyographic activity of erector spinae (ES), internal oblique (IO), rectus femoris (RF), and biceps femoris (BF) after bridge exercise with pelvic belt compression in subjects with lumbar instability. METHODS: Forty subjects with lumbar instability volunteered for this study. We asked them to perform the bridge exercise while wearing a pelvic belt compression for 30 minutes five times weekly over a six week period. The pelvic compression belt was adjusted just below the anterior superior iliac spines with stabilizing pressure using elastic compression bands during bridge position. Surface electromyographic data were collected from the erector spinae (ES), internal oblique (IO), rectus femoris (RF) and biceps femoris (BF). RESULTS: After the six week intervention, the experimental group improved significantly. Muscle activation significantly decreased in the erector spinae, rectus femoris, and biceps femoris, and increased in the internal oblique muscle in bridge position while wearing a PCB (P <.01). CONCLUSION: Our findings suggest that the bridge exercise with pelvic belt compression is helpful to reduce activation in superficial muscles and lower extremity muscles such as erector spinae (ES), rectus femoris (RF), biceps femoris (BF) and increase activation in deep trunk muscle such as the internal oblique (IO).

Changes in Total Polyphenol, Total Flavonoid Contents and Antioxidant Activities of Hibiscus cannabin us L.

  • Ryu, Seung-Won;Jin, Cheng-Wu;Lee, Han-Shin;Lee, Ji-Yeon;Sapkota, Kumar;Lee, Beom-Goo;Yu, Chang-Yeon;Lee, Myoung-Ku;Kim, Myong-Jo;Cho, Dong-Ha
    • Korean Journal of Medicinal Crop Science
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    • v.14 no.5
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    • pp.307-310
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    • 2006
  • This study purposed to look for its uses by analyzing useful substances in kenaf (Hibiscus cannabin us L.) leaves based on the total polyphenol and flavonoid contents in the leaves, DPPH radical scavenging activity of leaf extract, SOD activity, etc. by different growth stage and variety. According to the results of experiment, the total polyphenol content was highest in Everglade-41 (27.9 mg/g dw.), the total flavonoid content was highest in Tainung-2 (42.3 mg/g dw.), and SOD activity was highest in Dowling (96.1 %). However, DPPH radical scavenging activity was similar among the three varieties.

Pullout Resistance by Horizontal Spacing of Geosynthetic Strip (띠형 섬유보강재의 설치간격에 따른 인발저항 특성에 관한 연구)

  • Han, Jung-Geun;Yoon, Won-Il;Hong, Ki-Kwon;Lee, Kwang-Wu;Kim, Ju-Hyong;Cho, Sam-Deok
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.315-324
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    • 2010
  • In this study, the pullout tests are conducted to evaluate the pullout resistance of the geosynthetic strip with or without bearing resistance zone. The test results are indicated that the pullout resistance of the geosynthetic strip without bearing resistance zone is not affected by horizontal spacing. However, the horizontal spacing of reinforcement with bearing resistance zone affects the bearing resistance. In other words, it is indicated that the bearing resistance at spacing of 210mm is larger than that at spacing of 260mm. This means that the pullout strength at spacing of 210mm is larger than that at spacing of 260mm. Therefore.

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Review of Case Reports of Neuropsychiatry Disease in Oriental Medicine (한의학에서 신경정신과 질환의 증례논문 동향분석)

  • Heo, Eun-Jung;Han, Chang-Hyun;Kim, Wu-Young;Park, Sang-Young;Jeon, Won-Kyung
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.25 no.4
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    • pp.708-714
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    • 2011
  • This study was aimed to review the trend of case reports of neuropsychiatry disease. The case reports were collected by retrieving Journal of Oriental Neuropsychiatry and analyzing period were from 1990 to 2010. We analyzed them for publish year, research institution, patients, sorts of diseases, pattern identification diagnosis, instrument, treatment period, sorts of treatments, and treatment with western medicine. We analyzed 142 case reports and there were many kinds of neuropsychiatry diseases and instruments that were evaluated the process. The reserchers used various treatment with oriental medicine. However, the number of case reports have decreased since the year of 2008. Most of the research institutions were university and general oriental medical hospital and the portion of private hospitals was only 2.11%. For the development of practical clinical trial of oriental medicine, we needs more qualifying case report. We hope more reserchers for psychiatry disease of oriental medicine will be interested in the publication of case report and this will serve to produce advance of oriental medicine.

Relationships among the Country Image, Product Image and Purchase Intention (국가이미지, 제품이미지 및 구매의도의 관계)

  • Xiong, Jian-Yong;Wu, Yan-Yan;Kim, Won-Kyum
    • The Journal of the Korea Contents Association
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    • v.10 no.12
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    • pp.267-273
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    • 2010
  • This study is about to reveal the connections and the importance of China's country image, product image, and purchase intention. Following are the results of the empirical analysis summary. First, in country's national image, except political image, economic image and cultural image have a positive (+) impact on the product image is true. Secondly, a country's product image have a positive (+) impact on purchase intention. Therefore, consumer tend to improve purchase intention when China's product image increase. In summary, consumers' purchase intention can obtain the best positive result, when a country's national image is set as the core factor, which combines and improves concurrently with one's product image.

Magnetic hardening of nano-thick $Sm_2$$Fe_{17}$$N_x$ films grown by a pulsed laser deposition

  • Yang, Choong-Jin;Kim, Sang-Won;Jianmin Wu
    • Proceedings of the Korean Magnestics Society Conference
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    • 2000.09a
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    • pp.251-265
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    • 2000
  • S $m_{2}$F $e_{17}$ $N_{x}$ film magnets using a S $m_{2}$F $e_{17}$ target were prepared at $N_{2}$ gas atmosphere using a Nd-YAG laser ablation technique. The effect of nitrogen pressure, deposition temperature, pulsation time and film thickness on the structure and magnetic properties of S $m_{2}$F $e_{17}$ $N_{x}$ film were studied. Increasing the nitrogen pressure up to 5 atm. was confirmed to lead the formation of complete S $m_{2}$F $e_{17}$ $N_{x}$ compound. Optimized magnetic properties with the nitrogenation temperature ranging over 500-53$0^{\circ}C$ could be obtained by extending the nitrogenation time up to 4 hours. Relatively low coercivities of 400~600 Oe were exhibited from the S $m_{2}$F $e_{17}$ $N_{x}$ films having the thickness of 50~100 nm while 4$\pi$ $M_{s}$ of 10~12 kG could be achieved. In-plane anisotropic characteristic, which was the basic goal in this study, was achieved by controlling the nitrogenation parameters.ameters.ers.ameters.

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A study of scientific theory in 『Li-Yao-Pian-Wen』 (리약병문의 학술사상에 관한 연구(1) -외치요법의 처방 선택과 처방조제(處方調劑)원칙-)

  • Jung, Myumg Young;Kim, Eun Ha;Ahn, Sang Woo;Lee, Byung Wook
    • The Journal of Korean Medical History
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    • v.18 no.1
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    • pp.65-88
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    • 2005
  • 1) Objective External treatments have various curative effects. So it had been used to cure various patients. But, it has a limited sphere of application in the present South Korea. And the "Li-Yao-Pian-Won" had been written by Wu-Shang-Xian(吳尙先) in 1864. The book is the first technical book of external treatments. So, he has been held in respected as the father of external treatments by many people. Therefore we would like to bring out it's external treatments theory 2) Conclusions He had insisted that external treatments principles are identical with internal treatments. So, prescriptions of external treatment are selected and made by principles of internal treatment. But external treatments have following characteristics 1. Each of external treatment prescriptions have various effects. 2. Exchange of treatments is very easy. 3. We can make free use of various external treatments for care at a time. 4. External treatments are very economical. 5. External treatments are very easy to study. 6. External treatments are simple, speedy, precision.

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