소아 장중첩중에 대한 임상적 고찰

박혜덕,김인구 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.2

This paper is a retrospective study of 48 cases of intussusception in infants and childern admitted to the pediatric surgical division of Chungam National University Hospital from Jan 1982 to Sep. 1986. and the results were as follows; 1. The intussusception was commonly occurred under 6th to 12th month of age(66.6%) and the patient age ranged from 3 month old to 5 years. 2. The ratio of male to female was 2:1. 3. The clinical symptoms and signs were as follows; currant jelly stool(100%), abdominal pain (93.8%), vomiting (91.7%), abdominal mass (79.2%) and abdominal distention(20.8%) in order of frequency. 4. The percentile of body weight of patients was as follows: 97%(8.3%), 90%(29.2%) 75%(18.7%), 50%(18.7%), 25%(16.7%), 10%(6.3%) and 3%(2%). The patient within above 50% was 75%, so relatively, the children in good nutritional state and well growing were more affected. 5. The 17 cases(35.4%) of intussusception visited our hospital within 12-24hours after onset of symptoms. In the treatment of 48 cases of intussusception, barium enema reduction was performed in 33 cases (68.8%), manual reduction, 14 cases(31.2%) and ileal segmental resection, 1 case(2.1%) 6. The reduction rate of barium enema according to Oct. 1984 was as follows: barium reduction rate(42.8%), manual reduction rate(57.2%) in 82, 83 and 84 year. Barium reduction rate(89%), manual reduction rate(11.1%) in 85 and 86 year. 7. The reduction rate of barium enema was decreased in the younger patients, and the results were as follows; 2-3 year old(100%), 1-2year old (66.7%), over 3 year old (66.7%) and under 6 month old (55.6%). 8. The anatomical types of intussusception were ileocolic (52.1%), ileocecal (39.6%), ileoileal (6.2%) and colocolic (2.1%). The reduction rate of barium enema according to the type of intussuscdtion were ileocolic (80%), ileocecal (63.2%), colocolic (100%) and ileoileal type, 3 cases (100%) were all failed.

Retinoids에 의한 전립선 암세포의 침윤성 및 Prostate Specitic Antigen의 조절

박혜덕 최신의학사 1993 最新醫學 Vol.36 No.5

SrTiO₃첨가에 따른 (x)BaTiO₃-(1-x)SrTiO₃의 유전적, 전기적 특성

정해덕,장동환,김덕근,홍경진,최창주 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-

In this paper, a ferroelectric material BaTiO3 was added to SrTiO3, then (x)BaTiO3-(1-x)SrTiO3(0.7≤x≤1) ceramics were fabricated with stable electrical properties in high voltage. Microstructures and electrical properties were investigated according to mixing conditions of addition material SrTiO3. As a result of the investigation of all experiments, the shrinkage was excellent in 0.9BaTioO3-0.1SrTiO3. The grain size was increased, the curie temperature was shifted low temperature. The 0.9BaTiO3-0.1SrTiO3 was appeared stable property in temperature vs. permittivity. Also, 0.9BaTiO3-0.1SrTiO3 was showed stable dielectric properties at 25~85[C]. V-I properties of specimen were observed in the temperature range of 21~143[C], were divided into three regions. the region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.

작업자의 손목비와 수근관증후군 위험도

김덕수,정해관,권용욱 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.3

목적 : 손목의 반복적 동작을 해야하는 사업장에서 근무하는 근로자군에서 수근관증후군 유병률과 위험요인을 알아보고, 손목 형태와 수근관증후군과의 관련성을 알아보고자 하였다. 또한 손목 측정치가 수근관증후군 발생에 미치는 예측 정도를 확인하여 수근관증후군 예방에 도움을 주고자 본 연구를 수행하였다. 방법 : K시에 위치한 자동차 방음제를 생산하는 사업장의 근로자 남성 45명, 여성 16명, 총 61명을 대상으로 2000년 4월 설문 조사, 이학적 검사, 근전도 검사를 통하여 다음과 같은 결과를 얻었다. 결과 : 수근관증후군의 유병률은 100명당 26.2명이었다. 수근관증후군 위험요인 단변량 분석에서 연령이 증가할수록, 학력이 낮을수록 교차비가 증가하는 소견을 보였다(p<0.01). 사무직에 비하여 생산직에 근무할수록, 특히 진공작업에 근무할수록 교차비가 유의하게 높게 나타났다(p<0.01). 손목비가 0.74 이상인 군에서 0.74 미만인 군에 비하여 교차비가 유의하게 높았다(p<0.05). 수근관증후군과 관련있는 변수를 알아보기 위하여 로지스틱 회귀분석한 결과 사무직에 비하여 생산직 I (시상작업), 생산직 II (진공작업)에 근무할수록 교차비가 유의하게 높았다(p<0.01). 작업부서를 통계변수로 한 근전도 검사결과와 손목비의 편상관계수 분석에서 여성의 정중 및 척골 감각신경 전도검사의 원위잠시 차이와 손목비와는 유의한 양의 상관 관계를 보였다(p<0.05). 결론 : 손목비는 수근관증후군의 발생과 연관설이 있는 것으로 나타났으나 예측력이 높지 않아 감수성의 예측지표로 직접 이용하는 것은 무리가 있다. 이러한 문제점을 보완한 측정 방법과 예측력이 높은 지표를 개발해야 할 것이다. Objectives : To evaluate the risk factors of the cabal tunnel syndrome (CTS) and the impad of the wrist ratio on the prevalence of CTS in workers on repetitive work over a long term. Methods : Study subjects consisted of 45 mail and 15 female workers in a company that produces soundproof material in Gyeongju. We conducted a physical examination, a self-reported questionnaire survey and a nerve conduction study. CTS cases were defined as those subjects that had a positive finding in both the nerve conduction study and the physical examination done by a doctor specializing in rehabilitation medicine. Results : Prevalence of CTS among the study subjects was 26.2/100 persons. The prevalence of CTS was positively associated with increasing age (p<0.01, usiug the chi square test for trend) and female gender (OR=6.98, 95% CI=1.66-31.0), but was negatively associated with the educational level (p<0.01 by the chi-square for trend). Workers in the production area had a higher prevalence of CTS compared to those in the clerical area (OR=10.8 in the frame manufacturing process, OR=32.2 in the vacuum molding process). Patients with CTS had a narrower mean wrist width and a shorter mean hand and palm length, compared to those that had no disease (p<0.01 by the Student's t-test). The number of subjects who had a wrist ratio of 0.74 or more was significantly higher in cases of CTS (OR=4.0, 95% CI=1.01-16.3). However, a multiple logistic regression analysis showed only that the type of work was a significant variable after adjusting for the other variables. Conclusions : The writs ratio, a surrogate of carpal tunnel configuration, can represent individual susceptibility to CTS. However this study shows that the use of the wrist ratio for predicting CTS risk is not adequate. The development of a new carpal tunnel configuration index based on more direct measurements of the tunnel shape will provide a better predictor of individual susceptibility to CTS.

일개 자동차 부품공장 근로자에서 초음파로 측정한 수근관 형태와 수근관증후군 위험도

김덕수,정해관,임현술,권용욱,이종민,조대현,최대섭 大韓産業醫學會 2002 대한직업환경의학회지 Vol.14 No.3

목적 : 일개 사업장의 생산직 근로자를 대상으로 손목 계측치 및 초음파를 이용한 수근관 계측치의 상관성 분석을 통하여 수근관증후군 발생에 관여하는 개인의 감수성 및 위험요인을 파악하여 생산직 근로자들의 수근관증후군 예방에 활용하고자 본 연구를 수행하였다. 방법 : 경주시에 위치한 자동차 방음재를 생산하는 사업장에 생산직 근로자 남자 24명, 여자 11명 등 총 35명을 대상으로 2000녀 4월과 2000년 10월 반드시 각 설문조사, 이학적검사, 전기진단검사를 실시하였으며, 2000년 10월에는 초음파를 이용한 수근관계측도 실시하였다. 결과 : 수근관증후군의 신체계측 요인에 따른 분석에서는 수근관 전치/폭 비가 0.17 미만인 군에 비하여 0.17 이상인 군에서 통계적으로 유의하게 높았다(p<0.05). 총 수근관 면적(두께×폭)은 300 ㎟이상인 군에 비하여 300㎟ 미만인 군에서 통계적으로 유의하게 높았다(p<0.05). 성별을 통제변수로 처리한 신체 계측치간 상간 분석에서는 수근관폭은 전기진단 검사와 음의 상관성을 보였으며, 수근관 두께는 전기진단 검사와 양의 상관성을 보였다. 수근관 두께/폭 비는 전기진단 검사와 양이 상관성을 보였으며, 수근관비 전치/두께 비는 전기진단 검사 결과와 음의 상관성을 보였다. 하부 수근관 면적[폭×(두께-전치)]은 전기진단 검사와 양의 상관성을 보였으며, 상부 수근관 면적(폭×전치)은 전기진단 검사와 음의 상관성을 보였다. 또한 수근관 전치의 상대적 비가 클수록 수근관증후군의 회복이 유의하게 좋았다. 결론 : 수근관증후군은 수근관 폭이 좁을수록, 수근관 두께가 두꺼울수록, 수근관 전치가 작을수록 수근관증후군 위험도가 증가한다. 저자들은 초음파를 이용한 수근관 형태의 측정은 수근관증후군의 발생의 내적 요인에 대한 중요한 정보를 제공하면 수근관증후군 발생 및 회복의 개별적 위험요인을 예측하는데 중요한 근거를 제공하는 것으로 판단하였다. Objectives: This study was conducted to evaluate individual susceptibility to carpal tunnel syndrome (CTS) by ultrasonographic measurement of the carpal tunnel configuration in workers doing repetitive work. Methods: The study subjects consisted of 24 male and 11 female workers in a soundproof material manufacturing company in Gyeongju. We conducted a self-reported questionnaire survey, a physical examination and an electrodiagnostic study (EDS) in April 2000. After the examination, jobs were rearranged for workers with CTS. A follow up physical examination. EDS, and measurement of the carpal tunnel by ultrasonography was done six monsths later. Results: Of those studied. prevalence or CTS was 63.6/100 persons among women and 29.2/100 persons among men. Mean depth and width of wrist was shorter in those with CTS compareal to the controls (p<0.05). The risk of CTS was higher in workers whose carpal tunnel ratio (displacement/width) was 0.17 or higher (OR 7.13, 95% confidence interval 1.18-43.1), and in workers whose carpal tunnel area was less than 300 ㎟ (OR 8.00, 95% confidence interval 1.18-68.5). Carpal tunnel depth and depth/width ratio had a positive correlation with motor latency of the median nerve and median-ulnar sensory latency difference (p<0.05). whereas the carpal tunnel width. displacement/depth ratio, and area (width×displacement) had a negative correlation with median nerve latencies after adjusting for gender. Workers who showed an improvement in the clinical stage of CTS after job rearrangement had a significantly lower carpal tunnel displacement/width ratio and displacement/depth ratio. They also had smaller upper carpal tunnel area (width×displacement) and larger upper carpal tunner\l area [(depth-displacement)×width] than the controls (p<0.05). Conclusions:Ultrasonographic measurement of the carpal tunnel is a good predictor of susceptibility and prognosis of CTS in workers doing repetivive work.

Cu_0.28Ag_0.72InSe_1.4S_0.6 薄膜에 關한 硏究

鄭海德,朴桂春 木浦大學校 工業技術硏究所 1991 工業技術硏究誌 Vol.1 No.-

The polycrystalline Cu_0.28Ag_0.72InSe_1.4S_0.6 thin films are prepared by vacuum heat treatment of layer, which is deposited by direct resisting vacuum evaporation. From optical absorption spetra, the optical band gap energy is determined to be 1.5[eV] at room temperature. From electrical method, hole concentration, resistivity and mobility are 9.3*10^18[㎝^-3], 6*10^-2[Ωㆍ㎝], 11.2[㎠/V.sec] respectively at room temperature.

PC를 이용한 브러시리스 直流電動機 파라미터의 測定

鄭海德,李進,張永學 木浦大學校 工業技術硏究所 1991 工業技術硏究誌 Vol.1 No.-

This paper describes an effort to develop a microcomputer-based parameter identification system for a brushless D.C.motor driven by three phase trapezoidal current. It is found that Pasek’s equation is valid for the brushless DC motor driven by three phase trapezoidal current. Back EMF equation is derived from back EMF waveform of brushless DC motor driven by three phase trapezoidal current and it is verified that the voltage constant obtained by back EMF equation and the torque constant are equal, in the pure SI metric system. To minimize errors due to the ripple component in the measured armature current, digital averaging filter is employed. The algorithm is implemented on IBM-PC/AT using C language. In the proposed method, the measured current is in excellent agreement with the calculated current. And this close agreement conform the validity of this technique.

OSAM 객체 지향 데이타 모델에서의 질의어 처리

吳廉德,林海喆 弘益大學校 科學技術硏究所 1991 科學技術硏究論文集 Vol.1 No.-

We have introduced a query model for Object-Oriented Databases. An object class in Object-Oriented Databases consists of a specification part(Semantic property) and an implementation part. The specification part consists of the representation of semantics, associations, operations, rules and constraints, method, and inheritance. The implementation part of a class consists of procedures and functions. A Query in our query model returns subdatabases and derived attributes whose structure consist of some selected classes of objects and their semantic associations, i.e., it has the same structural characteristics as those of the original databases. The result of a query which is modeled by the same data model of the original databases in represented using Generalized relation and Statement structure. The G-relation provides a tabular representation of instances of a class, the used rule and constraints, the association type of the class, and the type of the instances of a class. The statement structure provides the association type of among the classes which consists of the resulting query.

PCB조립 라인의 준비 시간 단축 및 재고품 감소를 위한 스케줄링 전략

이영해,김덕한,전성진 한국경영과학회 1997 韓國經營科學會誌 Vol.22 No.1

Printed circuit board (PCB) assembly line configuration is characterized by very long set-up times and high work in process(WIP) inventory level. The scheduling method can significantly reduce the set-up times and WIP inventory level. Greedy sequence dependent scheduling (GSDS) method is proposed based on the current methods. The proposed method is compared with the current method in terms of three performance measures: line throughput, average WIP inventory level, and implementation complexity.

객체지향 데이타 베이스에서 질의처리를 위한 신뢰도 규칙

林海喆,吳兼德 弘益大學校 科學技術硏究所 1992 科學技術硏究論文集 Vol.2 No.-

We incorporate the concept of incomplete information in object oriented database and introduce rules to be applied. We deal with only indefinite information and numerical interval of various types of incomplete information. In addition, to represent the degree of incompleteness, we suggest incomplete information with certainty factor. An extended object-oriented data model is proposed for capturing incomplete information. A query model is also proposed to efficiently process incomplete information. Hence, we expect information processing to be more closely related to the real world. To process incomplete information, deductive works as processed in real world are required. We solve this issue using rules based on fuzzy theory and various semantic association provided by OSAM*, an object-oriented data model.