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- 저자 : Sim Gyeong-Ho (검색결과 55 건)
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Application of fracture mechanical assessment to in-wall shield ribs in ITER vacuum vessel
Kim, Yu-Gyeong,Kim, Hyun-Soo,Park, Chul-Kyu,Kim, Gwang-Ho,Moon, Ho-Kyu,Hong, Kwen-Hee,Chung, Woo-Ho,Lee, Hyeon-Gon,Sa, Jeong-Woo,Choi, Chang-Ho,Sim, Jae-Min,Chang, Yoon-Suk North-Holland 2017 Fusion engineering and design Vol.124 No.-
<P><B>Abstract</B></P> <P>In-wall shield ribs are installed between double walls of vacuum vessel and their role is to hold neutron shielding blocks. Since one of key issues on these structures is to sustain integrity during entire ITER operation without any in-service inspection or maintenance, fracture behavior shall be evaluated in design stage. In the present study, a weight function method was employed for crack initiation assessment. The most critical structure was selected as a representative one and its structural integrity was evaluated. In order to check validity of this method, an extended finite element method was adopted for bounding cases. As a result, not only structural safety but also quite conservatism were observed comparing to those of extended finite element analysis with similar tendency. It means that the weight function method could be a conservatively practical approach for fracture mechanical assessment of in-wall shield ribs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Structural analysis of IWS rib assembly was performed and verified via RCC-MR. </LI> <LI> Systematic crack initiation assessment was conducted by using weight function method. </LI> <LI> Conservatism of the weight function method was verified by detailed X-FEM analyses. </LI> </UL> </P>
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Hybrid Superconducting Fault Current Limiter of the First Half Cycle Non-Limiting Type
Gyeong-Ho Lee,Kwon-Bae Park,Jungwook Sim,Young-Geun Kim,Il-Sung Oh,Ok-Bae Hyun,Bang-Wook Lee IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>Resistive superconducting fault current limiters (SFCL's) are assumed to be a prospective solution for commercialization. But in spite of excellent current limiting performances realized by resistive SFCL's, commercialization and installation of SFCL's have been delayed due to difficulties in overcoming several technical problems such as a coordination with conventional relays. Resistive SFCL's may have difficulty in controlling an initiation of current limiting operation that sometimes is very important for coordination with relays, because the superconductor in the SFCL will quench immediately after the fault current reaches its critical current. In order to solve these problems, a novel hybrid SFCL of the first half cycle non-limiting type was developed. This paper presents the characteristics of this hybrid SFCL, its configuration and test results.</P>
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Effects of Pilates Reformer Exercise on Standing Postural Alignment
( Gyeong Seop Sim ),( Ho Jin Shin ),( Shin Young Kim ) 대한물리치료학회 2021 대한물리치료학회지 Vol.33 No.2
Purpose: This study examined the effects of applying the Pilates reformer exercise to 17 adult women on the alignment of the standing posture. Methods: The subjects performed a Pilates reformer exercise for 60 minutes a day, three times a week, for a total of eight weeks. The Pi lates reformer exercise consisted of five types: 1) lower and lift, 2) hundred, 3) plow, 4) airplane, and 5) twist. The standing posture align ment in the sagittal and frontal planes was measured using exbody 9100MOMI musculoskeletal analysis equipment. Results: A comparison of before and after the exercise using paired t-test revealed a significant decrease in the difference between the horizontal inclination and the vertical height that approached zero after the intervention in the frontal plane of anterior and posterior standing postures (p<0.05), and the lateral standing posture in the sagittal plane. In addition, the difference between the horizontal in clination and the vertical height decreased and approached zero after the intervention (p<0.05). Conclusion: The Pilates reformer exercise had a positive effect on the alignment of the standing posture.
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풀아웃 하중을 받는 카본/BMI 샌드위치 복합재 체결부 파손특성 연구
이경찬 ( Gyeong-chan Lee ),최영호 ( Young-ho Choi ),이관우 ( Kowan-woo Lee ),심재훈 ( Jae-hoon Sim ),정영인 ( Young-in Jung ) 한국복합재료학회 2017 Composites research Vol.30 No.2
The purpose of this paper is to investigate failure characteristics of Carbon/BMI-Nomex honeycomb sandwich on design parameters. A total of 6 types sandwich specimens were manufactured according to core height, face thickness and density, and environmental condition were applied to evaluate temperature and humidity effects of one of these specimens. The test results show that the core shear buckling loads was commonly observed in all specimens except for the joint with density of 64 kg/m<sup>3</sup>. After core shear buckling, however, the joint carried additional loads over the buckling loads and then finally failed in the upper face and lower face at the same time. In the case of specimen having high stiffness, the maximum failure load was low due to interfacial failure of the upper face and core without initial core shear buckling. The ETW1 and ETW2 conditions, which were carried out to evaluate the environmental condition of the sandwich specimen, show an initial failure mode which was significantly different from RTD condition. Also, the ETW2 condition with increased temperature under the same humidity shows that the core shear buckling load was 18% less than ETW1 condition.
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