非均質土層에 대한 Fragment Method에 관한 硏究

韓相賢,梁禹植,白榮植 慶熙大學校 1988 論文集 Vol.17 No.-

A Study is made on the 2-dimensional seepage problems using the fragment method. The method of fragment is an approximate analytical method of solution for any confined flow system of finite depth. The original fragment method is extended to the inclined impervious boundary and computer program is developed to obtain the head loss, discharge, and exit gradient under the dam. Accordingly, the fragment method can be recommend with confidence for practical use. The result is programed and a few case studies are examined.

발치 후 교정력 적용 시기에 따른 치아 이동 양상

한성호,황현식 전남대학교 치과대학 1999 전남치대논문집 Vol.11 No.1

This study was performed to compare and analyze the mode of tooth movement according to the timing of orthodontic force application after extraction. The upper right and left third incisors were carefully extracted at three-week interval in four adult dogs. Both canines were used as an anchorage for the bodily movement of the upper second incisors. Orthodontic force of 100 gm was simultaneously applied at one week after extraction on one side and four weeks after extraction on the other side using NiTi closed coil spring. While orthodontic force was applied for twelve weeks, the amount of tooth movement was measured at every second week with digital calipers. The animals were sacrificed at twelve weeks and histologic examination was executed to reveal any difference between both sides. The results were obtained as follows; 1. The tooth movement was faster in four-week side than one week side for the first two weeks while faster in one-week side during next two weeks 2. The rate of tooth mevement was fastest during four to six weeks period, then decreased gradually. 3. The total amount of tooth movement tended to be larger in one-week side compared to four-week side. 4. Any damage to tooth and periodontal tissue could not be seen in the histologic section of one-week side. These results suggest that earlier application of orthodontic force is better than later after extraction in terms of the rate of tooth movement.

평판하 연기선단의 가시화

한용식,김명배,오광철,유상필 한국화재소방학회 2001 한국화재소방학회논문지 Vol.15 No.1

수평 평판과 충돌하는 제트에 의해 생성되는 연기유동을 관찰하기 위해 질소가스에 kerosene연기입자를 뛰워 유동장을 가시화하였다. 광원으로는 아르곤-이온 레이져 평면광이 사용되었다. Kerosene smoke의 산란 광에 의한 수직평면 상(image)과 수평평면 상을 고속 CCD 카메라와 비디오 카메라로 녹화하였으며, 얻어진 영상으로부터 연기 선단의 순간속도 및 평균속도를 측정하였다. The flow induced by a vertically impinging circular jet under a horizontal plate is investigated by visualization technique, using kerosene smoke in nitrogen gas to visualize the vortex flow and impinging flow. The light source was the sheet beam of Ar-Ion laser. The vertical and horizontal images scattering of kerosene smoke were recorded by the high speed CCD camera and the video camera. The instantaneous velocity of the smoke front were measured from the acquisited images.

재활용 폐페인트를 이용한 방청페인트 개발연구

한대상,정재헌,조홍식,조창제,이종무,장상목 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2

In this study, The method to produce anticorrosive paint using reproductive wastepaint was investigated. The liquid-phase resin, BHO-500 and powder-phase paint BHO-300 were produced through wastepaint reproductive process. BHO-500 and BHO-300 could be replaced respectively polyvinylchloride resin and filler, which are thr components of anticorrosive paint. The properties of the anticorrosive paint produced through this process were excellent in comparison with the existing anticorrosive paint.

대량의 각혈로 사망한 장티푸스 1예

한상우,유진홍,권순석,김성훈,박지찬,홍은정,최경성,박용완,장준희,안지원,박유경,강지영,박상미,신완식 대한감염학회 2004 감염과 화학요법 Vol.36 No.5

We experienced a 25 year-old male patient with typhoid fever complicated with massive hemoptysis. Pulmonary complication in typhoid fever is very rare and to our knowledge, there has been no report of hemoptysis as a main cause of death with this disease. We herein report a rare case of typhoid fever.

수근관 증후군에서의 무증상성 척골신경병증

문준식,이성수,이지용,한범기,권준범,양현덕,이성익 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

발치 후 교정력 적용 시기에 따른 치아 이동 양상

한성호,황현식 대한치과교정학회 2000 대한치과교정학회지 Vol.30 No.1

본 연구는 발치 후 인접치 이동을 위한 교정력 적용 시 적용 시기에 따른 치아이동 양상을 비교·분석하기 위하여 시행되었다. 성견을 실험대상으로 상악 좌우 제 3절치를 3주 간격으로 각각 발거하고, 양 견치를 고정 원으로 제 2절치의 치체이동을 위한 장치를 장착하였다. 100 gm의 지속적인 힘을 내는 견인 스프링을 사용하여 발치 후 4주와 1주부터 좌우 제 2절치를 각각 12주간 동시에 견인하였다. 2주 간격으로 디지털 캘리퍼스를 이용하여 이동거리를 측정·비교하고 실험에 사용된 좌우 제 2절치의 조직소견을 관찰하여 다음과 같은 결론을 얻었다. 1.교정력 적용 후 처음 2주간에는 발치 후 4주에 견인한 치아가, 그 다음 2주간에는 발치 후 1주에 견인한 치아가 빠르게 이동하는 양상을 보였다. 2.12주간의 실험기간 동안 견인 4주와 6주 사이에 가장 빠르게 이동하는 경향을, 이 후에는 이동 속도가 감소하는 양상을 보였다. 3.실험기간 동안 이동한 전체 거리는 발치 후 4주에 비해 1주에 견인한 경우에서 크게 나타나는 경향을 보였다. 4.발치 후 4주에 견인한 경우에 비하여 1주에 견인한 경우에서 유해한 조직소견이 나타나지 않았다. 이상의 결과는 발치 후 교정력 부여 시 조기 적용이 유리함을 시사하였다. This study was performed to compare and analyze the mode of tooth movement according to the timing of orthodontic force application after extraction. The upper right and left third incisors were carefully extracted at three-week interval in four adult dogs. Both canines were used as an anchorage for the bodily movement of the upper second incisors. Orthodontic force of 100 gm was simultaneously applied at one week after extraction on one side and four weeks after extraction on the other side using NiTi closed coil spring. While orthodontic force was applied for twelve weeks, the amount of tooth movement was measured at every second week with digital calipers. The animals were sacrificed at twelve weeks and histologic examination was executed to reveal any difference between both sides. The results were obtained as follows : 1.The tooth movement was likely to be faster in four-week side than one-week side for the first two weeks while faster in one-week side during next two weeks 2.The rate of tooth movement was fastest during four to six weeks period, then decreased gradually. 3.The total amount of tooth movement was likely to be larger in one-week side compared to four-week side. 4.Any damage to tooth and periodontal tissue could not be seen in the histologic section of one-week side. These results suggest that earlier application of orthodontic force is better than later after extraction in terms of the rate of tooth movement.

ESO 기법을 이용한 외팔보의 신뢰성 기반 위상최적설계

김상락,박재용,이원구,유진식,한석영 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

This paper presents a Reliability-Based Topology Optimization (RBTO) using the Evolutionary Structural Optimization (ESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. The Deterministic Topology Optimization (DTO) is obtained without considering of uncertainties related to the uncertainty parameters. However, the RBTO can consider the uncertainty variables because it has the probabilistic constraints, In order to determine whether the probabilistic constraint is satisfied or not, simulation techniques and approximation methods are developed, In this paper, the reliability index approach (RIA) is adopted to evaluate the probabilistic constraint, In order to apply the ESO method to the RBTO, a sensitivity number is defined as the change in the reliability index due to the removal of ith element. Numerical examples are presented to compare the DTO with the RBTO.

사후분해 시체에 대한 법의학적 접근

최영식,이상용,김유훈,조갑래,이봉우,양경무,정낙은,서중석,이한영,이원태,강현욱 大韓法醫學會 2000 대한법의학회지 Vol.24 No.2

Disposal of a homicide victim by dismemberment is rare, but individual cases are on record in most major medicolegal departments. Recognition of postmortem mutilation may be of importance in the interpretation of certain murders committed by sexual perverts and other mentally deranged individuals and sometimes performed for the sole reason of easier disposal of the body. Postmortem dismemberment is usually readily recognizable as such; The edges of the injuries are dry and lack evidence of bleeding. The joints may be disarticulated without fracture, or the use of an axe or saw may be evident from examination of bones. Parallel horizontal or oblique furrows in the bone surface are caused by skipping of the saw prior to establishing depth. Such patterns on the bone may assist in identifying the particular saw involved. So we report 25 dismembered corpses that autopsied in National Institute of Scientific Investigation. This paper can help in attempting to establish not only the first criminal investigation steps but also the medicolegal approach methods in unidentified and dismembered deaths.

자궁경부암에서 p53과 human papillomavirus의 분포에 관한 연구

김영식,김대중,김의한,강상균,양승하 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

Uterine cervical carcinoma is the most common malignant tumor of woman in Korea. Cervical lesions are associated with various subtypes of human papillomavirus(HPV), and recently there is many reports for interrelationship between p53 gene and HPV in development of cervical carcinoma. HPV is associated with condyloma acuminatum, flat condyloma, cervical intraepithelial neoplasm(CIN), and invasive carcinoma in uterine cervix. Among the subtypes of HPV, type 6b and 11 are reported as low risk group and type 16 and 18 are high risk group. p53 is an one of oncogene which control the cellular proliferation. The loss of p53 function by mutation and complex binding with HPV E6 could act an important role in developmental mechanism of cervical carcinoma. To observe the relationship between expression of p53 and HPV in CIN and invasive carcinoma, we analysed CIN 26 cases and invasive squamous cell carcinoma(SCC) 62 cases processed for immunohistochemical stain using monoclonal mouse anti-p53 and polyclonal anti-bovine papillomavirus. Then positivity of p53 and HPV was compared. The results are as followings: 1) The p53 in CIN showed positive reaction in twelve cases(46.2%) of twenty-six cases. Positive rates of CIN Ⅰ, CIN Ⅱ, and CIN Ⅲ are 33.3%, 42.9%, and 50% respectively. 2) The p53 in invasive squamous cell carcinoma showed positive reaction forty-four cases(71.0%) of sixty-two cases. Positive rates of microinvasive and invasive SCC are 53.8% and 75.5%, respectively. According to cell type, keratinizing type were eighteen cases(81.2%) of twenty-two cases and nonkeratinizing type were ninteen(70.4%) of twenty-seven cases. 3) Papillomavirus revealed low expression rate in CIN(26.9%) and invasive SCC (16.1%). 4) The p53 showed positive reaction in fourteen(82.4%) of papillomavirus-positive seventeen cases. Above results revealed higher positive rate of p53 according to progression of CIN and SCC, and in keratinizing type than in nonkeratinizing type of SCC. Positive rate of papillomavirus was very low, but high positive rate in p53 positive cases which suggest that p53 and HPV corelate in development of cervical carcinoma.