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9.5/65/35 PLZT를 이용한 Color filtering 특성에 관한 연구
宋埈泰,余東勳,李範熙 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.1
In this study 9.5/65/35 PLZT was selected which has the excellent quadratic electro-optic property and slim-loop. It was fabricated by the methods of vacuum hot-pressing and sintering. The electrode of color filter was evaporated using the interdigital type masks. They had the ratio of electrode gaps and the specimen thickness which were 1 : 1, 1.5 : 1, 2 : 1, and 2.5 : 1. Its color filtering characteristics were measured in the range of wavelength 380 to 780[nm] and electric field 0 to 15[kV/cm]. The results shows the relationship between the thickness of specimen, the electrode gap and the maximum RGB transmittance.
류동목,박기범,이상철,김여갑 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4
Ossifying fibroma is a neoplasm representing one of the benign fibro-osseous lesions of the jaw. ossifying fibroma has been designated as a demarcated, occasionally encapsulated lesion consisting of fibrous tissue that contains variable amounts of mineralized material resembling abnormal bone or cementum-like tissue. most of them are solitary and show slow, often expansile growth centrally within the jaws and characteristrically behave in a benign fashion. But, rarely they occur as a multiple and in a gigantic form exhibiting an aggressive nature. We has a case of multiple ossifying fibroma showing rapid-growing behavior and sequential occurrence in all four jaw quadrants resulting in severe facial deformity and orbital compression. therefore such a rare case is reported here.
Effect of Hydride Reorientation on Delayed Hydride Cracking In Zr-2.5Nb Tubes
Yun Yeo Bum,Kim Young Suk,Im Kyung Soo,Cheong Yong Moo,Kim Sung Soo Korean Nuclear Society 2003 Nuclear Engineering and Technology Vol.35 No.6
The objective of this study is to investigate the reorientation of hydrides with applied stress intensity factor, the peak temperature and the time when to apply the stress intensity factor in a Zr-2.5Nb pressure tube during its thermal cycle treatment. Cantilever beam (CB) specimens with a notch of 0.5 mm in depth made from the Zr-2.5Nb tube were subjected to electrolytic hydrogen charging to contain 60 ppm H and then to a thermal cycle involving heating to the peak temperature of either 310 or $380^{\circ}C$, holding there for 50 h and then cooling to the test temperature of $250^{\circ}C$. The stress intensity factor of either 6.13 or $18.4\;MPa\sqrt{m}$ was applied at the beginning of the thermal cycle, at the end of the hold at the peak temperatures and after cooling to the test temperature, respectively. The reorientation of hydrides in the Zr-2.5Nb tube was enhanced with the increased peak temperature and applied stress intensity factor. Furthermore, when the CB specimens were subjected to $18.4\;MPa\sqrt{m}$ from the beginning of the thermal cycle, the reoriented hydrides occurred almost all over the Zr-2.5Nb tube, surprisingly suppressing the growth of a DHC crack. In contrast, when the CB specimens were subjected to the stress intensity factor at the test temperature, little reorientation of hydrides was observed except the notch region, leading the Zr-2.5Nb to grow a large DHC crack. Based on the correlation between the reorientation of hydrides and the DHC crack growth, a governing factor for DHC is discussed along with the feasibility of the Kim's DHC model.
CANDU Zr-2.5Nb 압력관에서 수소화물 재석출 거동
윤여범(Yeo-Bum Yun),김영석(Young-Suk Kim),정현철(Hyeon-Cheol Jeong),임경수(Kyung-Soo Im),김성수(Sung-Soo Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to investigate the reorientation of zirconium-hydrides in the water-quenched and furnace-cooled Zr-2.5Nb tubes with different peak temperatures and applied stress. To this end, cantilever beam (CB) specimens containing 60 ppm hydrogen were subjected to a thermal cycle treatment where the peak temperature changed from 310 to 380 ℃ and stresses were applied at the test temperature of 250 ℃approached by cooling from the peak temperature. The water-quenched CB specimens with a fine distribution of smaller hydrides had an enhanced reorientation of hydrides from the circumferential direction to the radial direction compared to the furnace-cooled CB. Further, the number of reoriented hydride increased remarkably with increasing peak temperature from 310℃ to 380℃. The reoriented hydrides increased with increased applied stress during the thermal cycle. The reorientation behavior of the hydrides ahead of the crack tip is discussed in terms of plastic deformation caused by changing when to apply stress to the CB specimens subjected to a thermal cycle.
Profiles of Spinal Cord Tumors Removed through a Unilateral Hemilaminectomy
Yeo, Dong-Kyu,Im, Soo-Bin,Park, Kwan-Woong,Shin, Dong-Seong,Kim, Bum-Tae,Shin, Won-Han The Korean Neurosurgical Society 2011 Journal of Korean neurosurgical society Vol.50 No.3
Objective : To present the profiles of spinal cord tumors that can be removed through a unilateral hemilaminectomy and to demonstrate its usefulness for benign spinal cord tumors that significantly occupy the spinal canal. Methods : From June 2004 to October 2010, 25 spinal cord tumors were approached with unilateral hemilaminectomy. We calculated the cross-sectional occupying ratio (CSOR) of tumor to spinal canal before and after the operations. Results : The locations of the tumors were intradural extramedullary in 20 cases, extradural in 2, and intramedullary in 3. The levels of the tumors were lumbar in 12, thoracic 9, and cervical 4. In all cases, the tumor was removed grossly and totally without damaging spinal cord or roots. The mean height and width of the lesions we195re 17.64 mm (3-47.5) and 12.62 mm (4-32.7), respectively. The mean CSOR was 69.40% (range, 27.8-96.9%). Postoperative neurological status showed improvement in all patients except one whose neurologic deficit remained unchanged. Postoperative spinal stability was preserved during the follow-up period (mean, 21.5 months) in all cases. Tumor recurrence did not develop during the follow-up period. Conclusion : Unilateral hemilaminectomy combined with microsurgical technique provides sufficient space for the removal of diverse spinal cord tumors. The basic profiles of the spinal cord tumors which can be removed through the unilateral hemilaminectomy demonstrate its role for the surgery of the benign spinal cord tumors in various sizes.
Yeo, In Hwan,Cho, Bum Yean,An, Jae Hong,Min, Byung Youl Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.905 No.-
<P>Since the column members in buildings deal with both vertical and horizontal loads, appropriated amount of load should be estimated in order to evaluate the fire resistance performance of the columns under loaded condition. However, according to the ISO 834, the international standard for the evaluation of structural members, the fire resistance performance evaluation of column members is only based on the displacement and displacement rate under loaded condition in a standard fire. The purpose of this study is to suggest appropriate axial load ratios for the evaluation of fire resistance performance. The test conducted in this study produced appropriate axial load ratios for different slenderness ratios. They are expected to contribute to more accurate estimation of fire resistance performance and more efficient and cost-effective structural design.</P>