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유압벌지실험을 이용한 순 티탄늄 판재의 소성유동곡선 평가(제2보)
김영석(Kim, Young-Suk),김진재(Kim, Jin-Jae) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.4
본논문에서는대형 선박의 판형열교환기등에 널리 이용되고있는 순 티타늄판재의소성변형을 유한요소해석하기 위한 기초 데이터로서 순 티타늄 판재의 유동곡선을 평가하였다. 순 티타늄 판재의 프레스 가공 시에 판재에는 국부적으로 큰 소성변형이 발생하고 있다. 그러나 기존의 단축 인장실험에서 얻을 수 있는 소성변형률이 낮아서 티타늄 판재의 가공공정 설계를 위한 유한요소해석의 정밀도를 떨어뜨리는 경우가 있다. 본 연구에서는 큰 소성변형률 까지 안정적으로 성형이 가능한 유압벌지실험을 수행하여 재료의 소성변형에서 가공경화특성을 나타내는 유동곡선으로써 진응력-진변형률 선도를 구하였고 그 결과를 인장실험 결과와 비교하였다. 순 티타늄 판재의 유압벌지실험에서 재료의 변형률은 3D 디지털 영상 상관법을 이용한 ARAMIS 시스템으로 실시간 측정된다. 이 유압벌지실험으로부터는 소성 변형률이 0.65 이상 까지도 안정적으로 재료의 소성유동곡선을 얻을 수 있었으며 그 결과는 Kim-Tuan 이 문헌 17[Y.S. Kim, J.H. In, Korean Acadmia-Ind. Coop. Soc.,(be in print), 2016] 의 연구에서 제안한 가공경화식으로 잘 핏팅됨을 알 수 있었다. In this study, the plastic flow curve of commercially pure titanium sheet (CP Ti) actively used in the plate heat exchanger etc., was evaluated. The plastic flow curve known as hardening curve is a key factor needed in conducting finite element analyses (FEA) for the forming process of a sheet material. A hydraulic bulge test was performed on the CP Ti sheet and the strain in this test was measured using the DIC method and ARAMIS system. The measured true stress-true strain curve from the hydraulic bulge test (HBT) was compared with that from the tensile test. The measured true stress-true strain curve from the hydraulic bulge test showed stable plastic flow curve over the strain range of 0.7 which cannot be obtained in the case of the uniaxial tensile test. The measured true stress-true strain curve from the hydraulic bulge test can be fitted well by the hardening equation known as the Kim-Tuan model.
Immobilization with Ketamine HCI and Tiletamine-Zolazepam in Cynomolgus Monkeys
Myung-cheol Kim,Sung-hyeok Hong,Soo-jin Lee,Young-suk Kim,Jae-il Lee 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2
with Ketamine HCl and Tiletamine-Zolazepam in Cynomolgus MonkeysJae-il Lee, Sung-hyeok Hong, Soo-jin Lee, Young-suk Kim and Myung-cheol Kim*Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, KoreaReceived March 4, 2003 / Accepted July 2, 2003J. Vet. Sci. (2003), 4(2), 187-191JOURNAL OFVeterinaryScience*Corresponding author: Myung-cheol Kim Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Korea Tel: +82-42-821-6757, Fax: +82-42-822-4216 E-mail: mckim@cnu.ac.kr
김훈,임재석,최성원,김호겸,권종진,최미숙,김성문 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.1
There are various defects caused by trauma or resection of maignant tumor in the orofacial region, which can be reconstructed with various regional and pararegional flaps. Among these defects, it is very difficult to reconstruct palatal and midfacial defects after maxillectomy and patients have problems in speaking and swallowing of food. Therefore it is very important for surgeons to reconstruct these defects functionally and esthetically and to return the patients to the normal social activity. These defects are usually obturated with prosthodontic appliances to assist the phonation and swallowing. But nowadays surgical reconstruction by various flaps was considered and performed for better rehabilitation. For this purpose the forehead flap, the nasolabial flap, the tongue flap, the sternocleidomastoideous flap, the temporal flap, the latissimus dorsi flap, the scapular flap etc. are used. We reconstructed small-sized plalatal defects with tongue flap, medium-sized palatal and maxillary defects after maxillectomy with temporal myofascial flap and large midfacial defects including eyeball exenteration with latissimus dorsi myocutaneous flaps. Here we are to report 5 cases of these flaps used for the reconstruction of palatal and midfacial defects and consider the versatility, reliability and limitation in use of these flaps.
Atomic Force Microscopy를 이용한 Al0.5Ga0.5As/GaAs 다중 에피층 구조의 단면관찰에 관한 연구
김희진,김재성,김용,김무성,민석기 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
다중 에피층 구조(Al0.5Ga0.5As/GaAs)의 단면을 AFM(atomic force microscopy)으로 관찰하는데 성공하였다. AFM을 이용한 다중 에피층 구조의 단면 관찰은 0.1M HCl을 이용해서 이미 다른 그룹에서 관찰한 바가 있으나, 본 실험에서는 처음으로 5% NaClO용액을 사용하여 시료를 선택에칭(stain etching)처리하였고, 선택적 산화와 에칭으로 AlGaAs와 GaAs를 서로 구분해 내었다. 5% NaClO로 처리한 시료의 AFM 이미지는 3초 미만 에칭하여도 관찰이 가능했다. 층간 구분이 선명하였고, 심지어 NaClO에 의한 GaAs층의 에칭 morphology까지 확인했다. 10mm정도의 구조는 쉽게 AFM을 이용해서 관찰이 가능했다. 반대로 0.1M HCl용액으로 에칭한 AFM이미지는 상대적으로 좋지 못한 것을 확인했고, 이것으로 HCl용액의 에칭선택성이 5% NaClO에 비해서 좋지 못함을 알 수 있었다. 5% NaClO용액을 사용한 단면관찰은 간단한 시료준비와 짧은 측정시간으로 nanostructure연구에 많은 활용이 있을 것으로 기대된다. We investigate the cross-section of Al0.5Ga0.5As/GaAs multilayered epitaxial structure by an atomic force microscope to see the feasibility of the technique. For the first time, we employ 5% NaClO etchant to discern each layer and obtain well resolved AFM images of the layers whose thicknesses are about nanometer scale. In contrary, we get relatively poor AFM images by applying. HCl etchants and it is attributed to poor Al0.5Ga0.5As/GaAs etching selectivity of HCl solution compared to that of 5% NaClO solution.
콘크리트의 급속염화물침투시험에 의한 염화물이온 확산계수 평가에 관한 실험적 연구
김갑수,조봉석,장종호,김재환,김용로,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
Chloride ions are considered to be the major cause of steel corrosion in concrete structures exposed to seashore environments and also permeation of chloride is controlled by chloride diffusion. Therefore, the study on chloride diffusion of concrete have been done so far by many researchers. In this study, several factors such as capacity of voltage, time of an electric current, concentration of NaCl solution, water-cement ratio, and temperature of the solution were examined to grasp what influence they were on the chloride ion diffusion properties using the Rapid Chloride Penetration Test(RCPT) by electrophoresis. Also standing on the basis of the such result application possibility of Rapid Chloride Penetration Test(RCPT) used in this study will be evaluated and the basic data on the durability design for the chloride attack will be suggested.
PVA-ECC를 활용한 Half PC 복합체의 역학적 특성에 관한 실험적 연구
김재환,김영덕,김갑수,조봉석,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
ECC represents one particular class of HPFRCC, which are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This study is to provide the fundamental data for the development of hybrid construction method such as the half PC(Precast concrete) reinforced by PVA-ECC, the mechanical properties of half PC according to the alteration of properties of PVA-ECC in terms of the type of fiber, Vr, S/M, placing height of PVA-ECC, are experimentally investigated. As the results. it is found that the half PCs of PVA-ECC have very higher mechanical performance in terms of yield load, strain capacity beyond yield point and maximum flexural load than that of mortar. Also, flexural crack in the half PCs of PVA-ECC are not localized at first crack and are growed to many micro crack, especially multiple cracking in specimen of P(12)-30-0.1ㆍ3 occurred.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)
김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1
Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.
口眼渦斜 患者의 Gadolinium-DPTA enhanced MRI 所見에 대한 臨床的 考察
김재수,최우석,김용석,고형균,강성길,김창환 경희대학교 동서의학연구소 2001 東西醫學硏究所 論文集 Vol.2000 No.-
This study is designed to evaluate the clinical implications of Gd-DPTA (Gadolinium-diethyl - enetriamine pentacetic acid) enhanced MRI(Magnetic resonance imaging) in Bell's palsy and find it's usefulness in Oriental Medicine In this study, 25 outpatients with Bell's palsy were studied that MRI was performed. To evaluate degree of facial palsy, H-B(House-Brackmann) Grade was used. In Oriental Medical therapy, Acupuncture and Herbal medicine were treated. Subjective causes was divided into exposure to chill, fatigue, stress, mixed cases. Enhanced site was compared with symptoms which were disorder of eye, hearing, taste, and facial muscle palsy. Also, Relation between time which was performed MRI and enhancement was analyzed. The enhanced lesion in MRI was divided into five segments; Internal auditory canal, Labyrinthine segment, Geniculate ganglion, Tympanic segment, Mastoid segment. In Bell's palsy, 20 of 25 patients(80%) had abnormal contrast enhancement of the facial nerve. The H-B grade and interval performed MRI from onset were directly proportionate to enhancement. That is to say, Severe facial palsy short interval show high possibility of enhancement. There was no relation between subjective causes and enhanced site of facial nerve in MRI. Also Clinical symptoms didn't coincide with MRI findings.