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Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect
Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.
유산양 유방염에 대한 Chitosan 약침의 치료 효과
황수현,서진석,김덕환,김명철,신상태,전무형,南三郞,김영찬,이우근,표수일 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-
To improve the therapeutic method for mastitis, treatment effect of chitosan pharmacopuncture was examined in three milking goats(A,B and C). Mastitis was artificially induced in two milking goats(A and B) and one goat(C) was naturally infected case with mastitis. The acupoint used was Yang-Ming and chitosan suspensions(provided from Tottory University, Japan: 30㎎ of chitosan/㎖)were injected to the acupoint with 5㎖/time for 3 days, respectively. As for the change of somatic cells in milk along with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in all udders of B. In addition, as for the change of total leukocyte counts of peripheral blood with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in B and C except A which showed a increasing tendency until on the 7th day. In the change of neutrophil/lymphocyte(N/L) ratio, increasing tendency was seen in A and C but increasing tendency after slight decrease was observed in B. Further, in the change of serum total protein and A/G ratio, serum total protein content was decreased after slightly increase on the 3rd day in A, and they were decreased after increase until on the 7th day in B and C, respectively. As for the change of A/G ratio, different pattern increasing tendency was shown in A, B and C.
황성남,박관,김영백,민병국,석종식,최덕영 대한신경외과학회 1993 Journal of Korean neurosurgical society Vol.22 No.6
Intraoperative aneurysmal rupture can be defined as aneurysmal rupture that takes place during any procedure from the induction of anesthesia to the closing of the wound and may result in a disastrous surgical outcome if not managed properly. The author experienced 11 cases of intraoperative aneurysmal rupture among 134 cases of aneurysm surgeries over the past 7 years at Yong-San hospital. The intraoperative rupture rate was 8% and there was statistically significant higher incidence of rupture in the early operated group. Rupture occured during dissection in 5 cases and during the clipping procedure in 6. The early and late mortality was 27 %, which included one case that could also be attributed to the direct effect of subarachnoid hemorrhage.
경추치상돌기 골절후 나타난 지연성척수병 2예 : Report of Two Cases
김영백,황성남,최덕영 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.8
We reported two cases of delayed myelopathy associated with odontoid fracture due to a nonunion and the resultant instability of the atlantoaxial joint. Both of two cases showed marked compression of cervical cord at C1 level by displaced odontoid process and overgrown fibrous tissue. We performed laminectomy of atals and posterior fusion from occiput to axis with autogenous iliac bone. We also reviewd the reported cases in the literature and surgical consideration.
경추부 후종인대골화증의 전방경유수술법 : 증례보고 Case Report
김영백,황성남,최덕영 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.9
The authors describe a case of a 41-year-old woman who developed clumsiness and decreased sensation of both hands due to ossification of the posterior longitudinal ligament (OPLL) of the cervical spine. The central part of the vertebral body and ossified area of the posterior longitudinal ligament was removed and the defect was filled with iliac bone graft. The operative result was excellent and the brief review about OPLL was made.
뇌의 미만성 축삭 손상 정도, 지능 지수 그리고 예후와의 상호관계
양승민,김영백,권정택,박승원,황성남,최덕영 중앙대학교 의과대학 의과학연구소 2001 中央醫大誌 Vol.26 No.2
Diffuse axonal injury (DAI) is defined as posttraumatic coma for over 24 hours without intracranial mass lesion. the purpose of this study was to examine the neurologic state of the patient and to evaluate the psychiatric sequela after DAI by psychometric analysis.Twenty eight patients with DAI were analyzed by a psychoanalyzer. Electroencephalography and magnetic resonance(MR) imaging were performed on eighteen patients. The ratio of male to female was about 6 to 1 and the major cause was traffic accident followed by fall down. Radiologic abnormality in MR image was predictors of poor outcome and early neurologic state was one of the most significant prognostic factor. Psychometric anlysis revealed that lntelligence Quotient was correlated with outcomes and most of patients with DAI were in normal range of lntelligence Quotient(67.9%) but they have suffered from variable psychologic problems, such as depression, anziety, phobia and dementia. Previous studies in DAI have been based principally on the prognostic factors and treatment without a systemic apporach to their meurologic and psychologic problems. Psychometric analysis can reveal psychologic symptom in the patients with DAI and appropriate management of their psychiatric problems may carry important implications for management of patients with moderate or servere DAI and improve rehabilitation outcomes.
박종혁,석종식,목진호,박관,김영백,민병국,황성남,최덕영 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.6
In rare occasions in which aneurysmal neck clipping is nearly impossible, coating is employed. During the period from 1985 to 1992, 312 patients with aneurysm underwent surgery ; aneurysmal neck clipping were performed in 284 cases while coating only in 28. The reasons that coating was required were ; wide and broad neck in 13, perforators arising from the neck in 4, neck tearing during dissection in 3, very friable neck in 2, severe adhesion with surrounding structures in 3, and small aneurysm without enough room for clipping in 3. In twenty-three cases, cotton wisp and bioglue were used as coating materials. In another five cases, the aneurysmal wall was reinforced using Surgicel or Gelfoam. Patients were followed for 24 months on average of all the patients. Four had last contact Six died(4 due to rebleeding and 2 due to pneumonia). Fourteen were good and 4 were moderately disabled. There were no rebleeding incidences during first three months' follow-up after coating. We thus concluded that coating an aneurysm offers some protection from rebleeding, particularly when the rebleeding risk period is over.