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김형찬,오동근,박수현,김기만,Kim, Hyoung-Chan,Oh, Dong-Keun,Park, Su-Hyeon,Kim, Kee-Man,Bruzzone, P. 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
As a participant taking part in the ITER TF conductor R&D program, we developed two toroidal field conductors with variations of conduit thickness resulting in the different void fraction of the conductors. The estimated void fractions of the conductors are 31% and 33%. In this paper we present the details of the TF conductor development and performance test results of them carried out by the measurement of current sharing temperature under cyclic loading. Regarding the conductor development, the internal-Sn-processed $Nb_3Sn$ strand characteristics, strand cabling, twist pitch and characteristics of the conduit materials are presented. For the understanding of the conductor design and performance, the conductor test results are presented and the effect of the conductor design parameters such as void fraction and twist pitch is discussed based on the results.
김형찬 한국교통대학교 2016 한국교통대학교 논문집 Vol.51 No.-
We study the entropy of an ideal gas in the presence of a strong Newtonian gravity. It is known that the entropy has a problem that the entropy logarithmically decreases to be negative for large gravity, which must be an error. In this work, we try to understand the origin of this pathology and discuss that this problem does not happen for more general physical situations.
김형찬,조원빈,정혜원 대한안과학회 2012 Korean Journal of Ophthalmology Vol.26 No.5
Purpose: To investigate morphologic changes of acute central serous chorioretinopathy (CSC) using spectral domain optical coherence tomography (SD-OCT) and confocal scanning laser ophthalmoscopy. Methods: This retrospective study included 63 eyes of 63 patients with unilateral acute CSC. All patients underwent simultaneous SD-OCT and fluorescein angiography examination using Spectralis HRA+OCT. Results: The external limiting membrane could be seen on SD-OCT, although the junction between photoreceptor inner and outer segments (IS/OS) was not detected in all eyes with retinal detachment (RD). However, IS/OS became visible after resolution of serous RD in 51 eyes (81.0%). SD-OCT images at the leakage sites showed a bump of retinal pigment epithelium (RPE) in in 47 cases (68.1%) and pigment epithelial detachment (PED) in 22 of 69 leakage sites (31.9%). In 14 of 69 leakage sites (20.3%), highly reflective areas suggesting fibrinous exudate were observed in the subretinal space. In nine leakage sites (13.0%), sagging or dipping of the posterior retinal layer was seen. Abnormal RPE changes such as RPE bump and PED were observed in 12 of 22 fellow eyes (54.5%). Conclusions: A variety of morphologic changes could be identified on SD-OCT, and those findings may contribute more information to our understanding of the pathophysiology of CSC.
김형찬,김시은,이준원,박강민,김성은,하삼열,신경진,박진세 대한신경과학회 2015 대한신경과학회지 Vol.33 No.2
Hashimoto’s encephalopathy is a neurological disorder associated with high titers of antithyroid antibodies. The common neurologic symptoms are seizure, stroke-like episode, or mental change. However other atypical presentations, such as aphasia, myoclonus, ataxia, and cognitive dysfunction have also been described. We report hear a 44-year-old woman with Hashimoto’s encephalopathy. The patient presented with ocular flutter as a principal manifestation, which is rare in Hashimoto’s encephalopathy.