성악골 절제술후 발생한 중앙부및 구개 결손부의 재건

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.

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.

신경회로망에 의한 용접 결함 종류의 정량적인 자동인식 시스템 개발에 관한 연구

김재열,김영석,김병현,유신,김훈조,정진홍 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1

A neural network approach has been developed to determine the depth of a surface breaking crack in a steel plate from ultrasonic backscattering data. The network is trained by the use of feedforward three-layered network together with a back-scattering algorithm for error correction. The signal used for crack insonification is a mode converted 70˚ transverse wave. A numerical analysis of back scattered field is carried out based on elastic wave theory, by the use of the boundary element method. The numerical data are calibrated by comparison with experimental data. The numerical analysis provides synthetic data for the training of the network. The training data have been calculated for cracks with specified increments of the crack depth. The performance of the network has been tested on other synthetic data and experimental data which are different form the training data.

일부 의료서비스업 VDT작업자의 상지 근골격계 증상의 정도와 관련된 요인

김형렬,원종욱,송재석,김현수,김치년,노재훈 大韓産業醫學會 2003 대한직업환경의학회지 Vol.15 No.2

목적: 본 연구는 상지 근골격계 질환의 유병율이 높은 집단으로 알려진 VDT작업자를 대상으로 이들의 근골격계 통증을 정량화하고, 정량화된 통증점수를 종속변수로 하여, 이와 관련성을 갖는 작업요인, 사회심리적 요인을 파악하고자 하였다. 방법: 서울지역에 위치한 1500병상 규모의 대학병원에 근무하고 단말기 작업을 주로 수행한다고 알려진 부서에 대해 병원내 안전관리과와 협의를 거쳐 163명을 연구대상으로 선정하였다. 이중 138명이 설문에 참가하였고, 이들을 최종 연구대상으로 하였다. 설문지를 가지고 연구변수를 측정하여, 나이, 근무연수, 가사노동의 정도 등의 인구학적 변수와 직무스트레스 및 사회적지지, 근골격계 증상, 통증의 양상 등을 조사하였다. 분석방법은 일반적 특성 및 작업특성, 통증의 양상을 성별에 따라 파악하였고, 통증점수의 타당성을 검정하기 위해, 통증점수의 구성요소와 통증점수를 시각적 상사척도와 상관성 검정을 시행하였다. 통증점수를 종속변수로 하고 직무요구도, 직무재량도, 동료의지지, 상사의지지, 여러작업환경특성, 인구학적 특징 등을 독립변수로 하여 다중회귀분석을 시행하였다. 결과: 첫째 통증의 정량화를 위해 사용한 통증평정지수는 시각적 상사척도와의 상관관계가 높은 것으로 나타나, 어느 정도의 타당성을 지닌 방법으로 해석할 수 있었다. 둘째, 이 통증 점수를 종속변수로 하여, 관련요인 분석한 다중회귀분석에서 직무요구도가 높을수록 통증의 정도가 높고(p<0.01), 여성일수록 남성에 비해 높은 통증점수를 보였다(p<0.01). 결론: 근골격계 질환의 높은 유병율을 보이는 집단의 경우, 이들의 증상 유무만을 가지고 관련요인을 분석하는 방법을 사용하기 어렵다. 따라서 이런 경우, 통증을 정량화하여, 다양한 관련요인을 찾으려는 노력이 필요하며, 본 연구에서 사용한 통증평정지수는 타당성을 지닌 정량화 방법이라고 여겨진다. 또한 본 연구에서는 직무요구도가 높을수록, 여성일수록 높은 통증점수를 보였다. Objectives: This study was designed to quantify symptoms in the upper extremities and to identify the pain related factors among hospital workers using video display terminals. Methods: The subject-group consisted of 138 employees working at a hospital using video display terminals. A structured questionnaire was used to estimate the participants' general characteristics, and job contents. Job stress was measured using Karaseks JCQ(Job Content Questionnaire). Pain in the upper extremities was identified according to the NIOSH symptoms survey criteria. Quantification was measured using Kim Chul's method. Pearson's Correlation analysis was used to identify validity in quantification. VAS(visual analog scale) was used to compare with this method. Multiple regression analyses elucidated the relationship between quantified pain and various work factors, such as job stress. Data were analysed with SAS 6.12 program. Results: First, in quantification using Kim Chul's method, the correlation between modified PRS(pain rating score) and VAS was extremely high by 0.60(P<0.01), indicating the high validity of PRS. Second, the groups of high job demand, high job control, and females were related to an increased pain level. Conclusions: These results suggest that the self pain assessment method, PRS, is valuable and useful in analyzing occupational musculoskeletal symptoms. High demand, job control and gender may influence the levels of pain. Prospective studies about musculoskeletal disorder are required.

생쥐모델에서의 망막모세포종 안구 자기공명분광법과 병리소견 : 초기경험

김동훈,김일중,양재한,김정훈,유영석,이봉재 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

Purpose: To show various MR spectroscopy and correlated pathologic images of retinoblastoma in nude mouse with a new human retinoblastom cell line (SNUOT-Rbl) which innoculated into intravitreous cavity. Materials and Methods: The established cell line was innoculated into mtravitreous cavity of 14 eyeballs of 7 mice and a transplanted retinoblastoma was examed for 1 month. Tl-weighted image (T1WI), T2-weihgted image (T2WI), and MR spectroscopy were obtained with 1.5 Tesla MRI (Magnetom Vision, Siemens, Erlangen, Germany) and 4.7 Tesla MRI (Bruker, Medizintechnik GmbH, Karlsruhe-Ettlingen, Germany). After scanning, eyeballs were extracted and hematoxylin & eosin stained specimens were examined with the microscope. We compared MR spectroscopy with pathologic findings and evaluated characters of tumors. Results: Innoculated cells into eyeball of mice grew retinoblastoma (8/14, 57%). Eyeball with retinoblastoma protruded externally and showed focal hemorrhage. Tumors showed low (n=3), iso (n=4), high (n=1) signal intensity on TIWI, low (n=5), iso (n=1), high (n=2) signal intensity on T2WI, and well enhancement (n=8) with contrast, Involvement of optic nerve was suspected by MRI and confirmed by pathology (n=1). Conclusion: We could demonstrate MR spectroscopy of transplanted retinoblastoma by new tumor cell line in vivo. This imaging technique facilitate molecular imaging investigation of retinoblastoma.

Vibrio vulnificus에 의한 패혈증 3예

김신무,김유현,신상희,오재세,강숙희,윤여안,이화재,김영옥 대한임상병리사협회 1986 임상병리사회지 Vol.18 No.1

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.

원위부 신세뇨관성 산증에서 산-염기 운반체의 결손

김혜영,한진석,전은실,진호준,주권욱,나기영,정우경,오지은,김현리,이서진,이중건,김근호,엄재호,궁성수,김진,이정상 대한신장학회 2000 대한신장학회잡지 Vol.19 No.5

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.