근위부 요도하열 59예의 치료성적

최원호,신기용,우영남 대한감염학회 1982 감염 Vol.38 No.8

마찰교반점접합한 5454-O 알루미늄합금 판재의 접합부 거시조직 및 기계적 특성에 미치는 접합인자의 영향

최원호,권용재,윤성욱,강명수,임창용,서종덕,홍성태,박동환,이광학,Choi, Won-Ho,Kwon, Yong-Jai,Yoon, Sung-Ook,Kang, Myoung-Soo,Lim, Chang-Yong,Seo, Jong-Dock,Hong, Sung-Tae,Park, Dong-Hwan,Lee, Kwang-Hak 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.6

Friction stir spot welding between 5454 aluminum alloy sheets with the different thicknesses of 1.4 and 1.0 mm was performed. In the welding process, the tool for welding was rotated ranging from 500 to 2500, and plunged to the depth of 1.8 mm under a constant tool plunge speed of 100 mm/min. And then, the rotating tool was maintained at the plunge depth during the dwell time ranging from 0 to 7 sec. The pull-out speed of the rotating tool was 100 mm/min. The increase of tool rotation speed resulted in the change of the macrostructure of friction-stir-spot-welded zone, especially the geometry of welding interface. The results of the tensile shear test showed that the total displacement and toughness of the welds were increased with the increase of the tool rotation speed, although the maximum tensile shear load was decreased. However, the change in the dwell time at the plunge depth of the tool did not produce the remarkable variation in the macrostructure and mechanical properties of the welds. In all cases, the average hardness in friction-stir-spot-welded zone was higher than that of the base metal zone. By the friction stir spot welding technique, the welds with the excellent mechanical properties than the mechanically-clinched joints could be obtained.

FRP 보강 원형 CFT 기둥의 구조성능 실험평가

최원호,신쟁연,류재용,박용필,최성모 한국복합신소재구조학회 2019 복합신소재구조학회논문집 Vol.10 No.2

Concrete filled steel tubes are widely used as columns in many structural systems and suffer local buckling problems by yielding the steel and reducing the confining effect. To overcome these drawbacks, we propose a method to delay local buckling by reinforcing steel with FRP. This paper focuses on the compression performance of the FRP reinforced CFT under cyclic compression. Two types of FRP(Aramid FRP, SRF Polyester Belt) are reinforced, analyzed and discussed outside the CFT with a variety of reinforcement thicknesses and reinforcement layers. In addition, we will evaluate the experimental values of the test body based on the proposed formula used in CFRP and determine whether it can be used. 콘크리트로 채워진 강관기둥은 많은 구조 시스템에서 기둥으로 널리 사용되며 강재가 항복하고 구속효과가 감소하여 국부 좌굴이 발생한다. 이러한 단점을 극복하기 위해 FRP를 보강하여 국부 좌굴을 지연시키는 방법을 제안한다. 이 논문은 반 복 압축하에서 FRP로 보강된 CFT의 압축성능에 관한 것이다. 두 가지 유형의 FRP (Aramid FRP, SRF Polyester Belt)가 다양한 보강두께와 류겹수로 CFT 외부에서 보강하여 비교 분석된다. 또한, CFRP에서 제안 및 사용된 공식에 기초하여 시험 기관의 실험 값을 평가하고 그것이 사용될 수 있는지를 결정할 것이다.

대장암 절제 후 이차수술로서 확인된 Krukenberg 종양

최원호,전시열 대한대장항문학회 2008 Annals of Coloproctolgy Vol.24 No.4

Purpose: We performed this study to evaluate the clinical presentation of, as well as the surgical intervention for, ovarian metastasis from colorectal cancers identified during postoperative follow-up. Methods: Twelve cases (2.4%) of ovarian metastasis were observed among retrospective chart review of 493 females patients who underwent a resection of colorectal cancer between 1981 and 2006. The covariates used for the survival analysis were patient age at the time of ovarian relapse, size of the tumor, initial TMN stage of the colon cancer, the interval to metastasis, and the presence of gross residual disease after treatment for a Krukenberg tumor. The cumulative survival curves for the patient groups were calculated with the Kaplan-Meier method and were compared by means of the Log-Rank test. Results: The average age of the patients was 48.9 years, ranging from 24 to 71 years, and the average survival time of the 12 patients was 19.6 months (estimated 3-year survival rate was 16.7%), with a range of 3 to 59 months after the diagnosis of a Krukenberg tumor. The survival rate for patients without gross residual disease was longer than that of patients with gross residual disease (P=0.0003). In contrast, patient age, size of the ovarian tumor, initial stage of the colon adenocarcinoma, and interval to metastasis were not prognostic indicators for survival after the development of ovarian metastasis. Conclusions: Our results suggest that, in general, most cases with ovarian metastasis have poor prognosis and that the absence of residual disease after treatment is a favorable prognostic factor in cases of a Krukenberg tumor of colon origin.

切削條件이 被削材 材質에 미치는 動的成分의 影響

崔元浩 忠州大學校 1987 한국교통대학교 논문집 Vol.21 No.-

In this paper I studied on the dyanamic comprenent in cutting force that has been indistinct the results are as follows. 1. characterisics of tool system have great effect on dynamic component of cutting force, and the effect depends on work material. 2. In any work material chip formation has great significance to dynamic component of cutting force. 3. The maximum amplitude of the dynamic compenent of cutting forces is proportional to the cutting area the ratio between the dynamic and statir components is this almost constant, though the value of ratio itself changes depending on the cutting speed and work material.

Al-Zn-Mg계 합금조성이 용접 열 영향 부의 시효거동에 미치는 영향에 관한 연구

崔元浩 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.1

Aging behaviors of the heat-affected zones in Al-2~4.5% Zn-1.2~4% Mg alloys welds were examined by means of hardness measurements an X-ray small angle scattering methods. The heat-affected zones in all the Al-Zn-Mg alloys welds are regions in the allots which have been heated at 100℃ or above by weld thermal cycles, where dissolution reversion or partial reversion occurs. A re-solution treated or reverted area in the heat-affected zone is extended in the alloys containing more of Zn. Recovery rate of hardness in the heat-affected zone also increases with increase in Zn content except for the alloys containing small amounts of Mn. Cr, Zr, Cu and Fe. Softened areas are formed in the heat-affected zones of all the Al-Zn-Mg alloys welds during post-weld aging at room temperature. It is wider and remains longer in the Al-Zn-Mg alloys containing more of Mg.

전문 대학생이 지각한 가족 체계 유형과 진로 태도 성숙 및 진로 결정 효능감의 관계

최원호,이태정 한영신학대학교 2003 敎授論文集 Vol.7 No.-

Kymene 557과 Acramine SLN에 의한 羊毛 TOP의 방축가공

최원호 혜전대학 1983 論文集 Vol.1 No.-

羊毛top(60's Merino 羊毛, 평균섬유장 75㎜)의 축융수축현상을 방지하기 위하여 polyamide-epichlorohydrin계 수지인 Kymene 557과 polyacrylate계 수지인 Acramine SLN을 수용액상태로 羊毛top에 처리하였다. Curing에 관계하는 온도, 시간을 측정하여 최적조건을 구하였고 고분자수지용액의 PH 및 처리온도변화에 따른 수축율(%)을 구하여 비교, 검토한 후 Kymene 557과 Acramine SLN의 최적처리조건을 고찰해 보았다. Acramine SLN의 경우 Kymene 557에 비해 낮은 온도에서 비교적 장시간 처리를 하여야 축융수축현상이 감소함을 알았다. 그리고 이들 고분자수지와 羊毛top사이에는 이미 알려진 結合力 외에도 전기적인 結合力이 잠재하고 있다는 사실을 추정할 수 있었다.

오인의 주체를 향한 사신(私信)으로서의 디지털 영상

최원호 한국영상학회 2014 한국영상학회 논문집 Vol.12 No.2

인류는 태초부터 이미지에 매혹되었다. 따라서 이미지의 역사는 사실적 이미지를 재현하기 위한 역사이기도 했다. 사진과 영화의 등장으로 사실적 재현의 목표가 실현되었지만, 디지털의 등장은 재현의 패러다임을 바꾸었다. 무엇보다도 가상의 이미지에 대한 생생한 재현이 가능해진 것이다. 본 연구에서는 실재보다 더 실재 같이 다가오는 디지털 영상에 매료되는 원인에 대한 새로운 담론을 제시해보고자 한다. 이를 위해 루이 알튀세르와 라캉의 이론을 토대로 무의식의 주체가 환상의 이미지를 사신(私信)으로 받아들임으로서 디지털 영상에 호명될 수밖에 없음을 주장하고자 한다.

고등학교 과학 동아리 활동 경험이 학생들의 진로선택에 영향을 준 사례 연구

최원호,우규환,박현주 한국과학교육학회 2004 한국과학교육학회지 Vol.24 No.6

학교밖 과학교육과 과학 동아리 활동에 적극적으로 참여한 경험을 가지고 있는 이공계 전공 대학생과 과학동아리 지도교사를 대상으로 과학 동아리 활동과 활동에 대한 인식을 조사하였다. 과학에 흥미와 재능을 가지고 있는 학생들이 1)직업적 역할 모델로서의 열정 있는 교사의 지도를 받으며, 2)직접적 체험을 경험하며, 3)오랜 기간 동안 과학실험을 준비하여, 4)비슷한 재능과 흥미를 가진 또래의 과학 동아리들 앞에서 발표하는 경험은 학생들을 과학관련 진로로 격려하는 좋은 요인임을 알았다. 또한 연구 참여자들은 과학 동아리 활동이 인생의 진로를 선택해야하는 중요한 시기에 과학에 대한 긍정적인 태도 형성에 영향을 주었고, 자신들의 학문적 진로를 결정하는데 중요한 영향을 주었다고 믿었다. This study is the analysis of interview with science major student about the effect of science club experience on career decision. The special interview was planned and arranged to meet students as well as their teacher. Both of the student whose background had experience in the science club activity, field science education during their high school days are majoring in physics and biology. In Summary : 1) science teacher's guidance deeply impressed the student that they respect the teacher as a occupational role model. 2) they really enjoyed the hands-on activities joyful. 3) their experience lasted so long time to keep them to stay in science field. 4) they had an experience of speaking before peer science club students who had similar interest and talent. We found the above four factors were really influential to encourage the subject to major in science career.