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전자선 가속기에 의해 방사선 처리한 양이온교환막을 이용한 전해-전기투석에 의한 HIx용액으로부터 HI의 농축
Gab-Jin Hwang,Jeong-Keun Kim,Sang-Ho Lee,Ho-Sang Choi 한국막학회 2007 멤브레인 Vol.17 No.4
HI몰랄리티가 9.5 mol/kg-H2O인 HI의 전해-전기투석을 시판의 양이온교환막(CMB)을 이용하여 요오드의 존재하에 실험을 진행하였다. 수소이온 투과의 선택성을 증가시키기 위해, 막은 전자선 가속기를 이용하여 방사선 처리하였다. 방사선 처리한 막의 막특성(막 저항, 이온교환용량, 함수율)을 측정하였다. 각각의 방사선량에서 처리한 막의 2 mol/dm3의 KCl 용액에서 막저항, 이온교환용량과 함수율은 처리하지 않은 막과 거의 동등의 값을 가졌다. HI몰랄리티가 9.5 mol/kg-H2O인 HI의 전해-전투기투석을 75℃, 9.6 A/dm2에서 진행하였다. 전자선 가속기에 의해 방사선 처리한 양이온교환막은 처리하지 않은 막과 비교하여 고분자의 가교구조와 함께 수소이온투과의 높은 선택성을 가졌다. Electro-electrodialysis of hydriodic acid with HI molality of ca. 9.5 mol/kg-H2O was examined in the presence of iodine using a commercial cation exchange membrane, CMB, as a separator. For the increase of the selectivity of proton permeation, the membrane was radiation-treated by accelerated electron radiation. The membrane properties (area resistance, ion exchange capacity, water content) of the radiation-treated membranes were measured. The area resistance in 2 mol/dm3 KCl solution, ion exchange capacity and water content of the radiation-treated membranes at each dose rate dad almost the same value as that of the non-treated membrane (original of CMB membrane). Electro-electrodialysis of hydriodic acid with HI molality of ca. 9.5 mol/kg-H2O was examined at 75℃ with 9.6 A/dm2. The radiation-treated cation exchange membrane by accelerated electron radiation had higher selectivity of the proton permeation by cross-linking structure of polymer than that of the non-treated membrane.
General Response for Lateral-Torsional Buckling of Short 1 -Beams under Repeated 1ρadings
Lee Sang Gab,Keith D. Hjelmstad 한국전산구조공학회 1992 한국전산구조공학회논문집 Vol.5 No.1
反復혜重올 받는 짧은 I 보 (Beam) 의 慣-비틀림 座때(Lateral-Torsional Buckling) 에 대한 흩윌뼈한 Parametric Study 를 逢行하여 보의 座맴現象올 좀 더 깊이 考흉하고자 한다. 有限한 비틀림햇形의 뒤틀림 (Warping) 이외에 m 少한 맺톨JTft形의 뒤틀립도 고려한 幾何學적 (完全) 非綠形의 一次7ê 보를 껴¥析的 모델 로 사용하고, 또한 金!홉의 周期的뺑性(Cyclic Plasticity) 쌓:tJJ을 보다 잘 나타내기 위해 多빼 週期的뿔性 모 덴올 Consistent Return Mapping Algorithm과 결합시켜 遭用한다. :한ì.ffI때 단방에서 아래와 갇은 여러가지 Parameter Study를 끊行함으로써 反復휴重을 받는 짧은 I 보의 함 -비블립 座며의 -압的 應홈을 ι~.흉한다 : 材料의 降ik~옳度, 降ik플래토 (Yield Plateau) , 뿔形率硬化,U-:tJJ 硬化(Kinematic Hardening) , 웰留應力, 作用倚重의 f.1端中心에 대 한 {f,í ι、率, 作用倚훌의 보 톰面에 대 한 높 이, 作用혜훨의 보 김이방향의 位置, 보 뻐f 面의 置f!{, 作用倚重으로 부터 멀리 떨어진 支持端의 固定度. The objective of this study is to perform extensive pa때netric studies of the lateral-torsional buckling of short I-beams under repeated loadings, and to gain a further insight into the lateal-torsional beam buckling problem. A one갑imensional geometrically (fully) nonlinear beam model is used, which includes superposed infinitesirnal transverse warping deforrnation in addition to finite torsional warping deforrnation. A multiaxial cyclic plasticity model is also implemented to better represent cyclic metal plasticity in conjunction with a consistent return rnapping algorithm The general respon않 for the lateral-torsional buckling of short I.beams under repeated loadings is examined through several parametric stud.ies around the standard case: the rnaterial yield strength, the yield plateau, the strain hardening, the kinernatic hardening, the residual stresses, the load eccentrκity with respect to the shear center, the height of the load with res야ct to the cross-section of the beam, the location of the load along the length of the beam, the dimesions of the cross-section of the beam and the fixity of the supported end remote from the load.
Lee, Sang-Gab,Lee, Jae-Seok,Chung, Hyun,Na, Yangsup,Park, Kyung-Hoon The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
Air gun shock systems are commonly used as alternative explosion energy sources for underwater explosion (UNDEX) shock tests owing to their low cost and environmental impact. The airbag inflator of automotive airbag systems is also very useful to generate extremely rapid underwater gas release in labscale tests. To overcome the restrictions on the very small computational time step owing to the very fine fluid mesh around the nozzle hole in the explicit integration algorithm, and also the absence of a commercial solver and software for gas UNDEX of airbag inflator, an idealized airbag inflator and fluid mesh modeling technique was developed using nozzle holes of relatively large size and several small TNT charges instead of gas inside the airbag inflator. The objective of this study is to validate the results of an UNDEX response analysis of one and two idealized airbag inflators by comparison with the results of shock tests in a small water tank. This comparison was performed using the multi-material Arbitrary Lagrangian-Eulerian formulation and fluid-structure interaction algorithm. The number, size, vertical distance from the nozzle outlet, detonation velocity, and lighting times of small TNT charges were determined. Through mesh size convergence tests, the UNDEX response analysis and idealized airbag inflator modeling were validated.
Giant Cell Tumor of Upper Thoracic Spine
Lee, Chul Gab,Kim, Sung Hoon,Kim, Dong Min,Kim, Seok Won The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.55 No.3
Giant cell tumor (GCT) of the spine is a rare benign tumor, but can be aggressive and can exhibit a high local recurrence rate. Furthermore, GCT of the upper thoracic spine may pose diagnostic and management difficulties. Here, we report a rare case of GCT of the upper thoracic spine with soft tissue extension to the spinal canal. The patient was managed by decompressive laminectomy and posterolateral fusion followed by an injection of polymethylmethacrylate into the vertebral lesion. The patient recovered clinically and showed radiological improvement after surgical treatment without tumor recurrence at his last follow-up of postoperative 7 years. We present this unusual case of GCT and include a review of the literature.
( Sang Gyune Kim ),( Jeong-ju Yoo ),( Young Seok Kim ),( Bora Lee ),( Soung Won Jeong ),( Jae Young Jang ),( Sae Hwan Lee ),( Hong Soo Kim ),( Young Don Kim ),( Gab Jin Cheon ),( Boo Sung Kim ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: To date, there is no acceptable criteria of spleen size for the clinical diagnosis of liver cirrhosis even though the recent Baveno consensus states splenomegaly is an adjunctive finding to define liver cirrhosis. We evaluated how relevant spleen volume (SV) measured by ultrasonography is to liver fibrosis stage and investigated the optimal cut-off of SV for liver cirrhosis. Methods: Total 431 patients whose SV was measured by ultrasonography (length x height x width x π/6) and got a liver biopsy for various reasons were included in this study. Spleen volume/body surface area (SV/BSA) in each patient was used for sensitivity analysis. Fibroscan score (kPa) was compared to SV for the relation with liver fibrosis stage. Clinical and laboratory findings were also collected. Results: The baseline characteristics of the patients were as follows: mean age (49.1±12.2), slightly male predominance (223/431, 51.7%), mean BSA (1.7±0.2 m2), most common etiology of liver disease is hepatitis B (190, 44.1%), mean MELD score (9.7±4.1), Child-Pugh class [(A/B/C, 339(78.7%)/75(17.4%)/17(3.9%)], fibrosis stage [F0/F1/F2/F3/F4, 35(8.1%)/40(9.3%)/69(16.0%)/56(12.99%)/231(53.6%)]. SV was significantly larger in young age (<40), male sex, viral hepatitis, high BSA, high MELD and Child-Pugh score. SV was also well correlated with fibroscan score (r=0.509, p<0.001). Mean SV (ml) according to fibrosis stage was F0 (169±59), F1 (189±99), F2 (198±82), F3 (236±79), F4 (457±283). AUROCs of SV and SV/SBA for predicting cirrhosis were 0.891 (95% confidence interval, 0.862-0.921), 0.905 (95% CI, 0.878-0.932). Optimal cut-off of SV and SV/SBA for the diagnosis of cirrhosis were 268ml, 161ml respectively. Conclusions: SV measured by ultrasonography was closely associated with severity of liver disease and fibrosis stage. SV measurement using ultrasonography is useful as a supplementary method for the diagnosis of liver cirrhosis.
Sang Chull Lee(李相喆),Yeo Gab Kim(金麗甲),Seon Sik Kong(孔宣植),Hyun Chull Kim(金賢哲),Jong Tae Lee(李宗泰) 대한구강악안면외과학회 1984 대한구강악안면외과학회지 Vol.10 No.2
We had presented a case of benign cementoblastoma of left mandibular body area of 16 year old female patient. The benign cementoblastoma, as defined by the W.H.O., is a neoplasm characterized by the formation of sheets of cementum-like tissue which may contain a very large number of reversal lines and be unmineralized at the periphery of the mass or in the more active growth area. The patient was admitted to Department of Oral & Maxillofacial Surgery, Kyung Hee University Medical Center with chief complaint of painless swelling on the left mandibular body area. We were certained of benign cementoblastoma through clinical and radiographic feature, and then performed surgical enucleation of tumor including removal of involved teeth. After 9 months follow up check, we noticed the bony replacement of operation site and no recurrence and so patient had an temporary removable partial denture.