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각종 간질환에서 Tc - 99m pertechnetate 경직장 문맥신티그라피를 이용한 문맥 순환의 평가
김관우 ( Kwan Woo Kim ),김종순 ( Chong Soon Kim ),김학산 ( Hak San Kim ),박원 ( Won Park ),이범우 ( Bum Woo Lee ),서관식 ( Kwan Sik Suh ),이봉휘 ( Bong Hwi Lee ),김광일 ( Kang Il Kim ) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.4
N/A Portal circultion in patients with various liver diseases was evaluated by Tc-99m pertechnetate per-rectal scintigraphy. 10mCi of pertechnetate was instilled into the upper rectum, and serial scintigrams were taken. Time-activity curves for the liver and heart were recorded sequentially. Through analysis of these curves, the per-rectal portal shunt indices were calculated for 15 norrnal controls, 12 with acute hepatitis (AH), 28 with chronic hepatitis, 51 with liver cirrhosis, 1 with falminant hepatic failure (FHF ). 5 with hepatic congestion (I-IC) due to congestive heart failure (CHF). The results obtained were as follows: 1) 15 normal controls and the patients with acute and chronic hepatitis all had 'Pattern II' scintigrams, and the patients with liver cirrhosis (LC) and hepatic congestion had 'Pattern II' scintigrams. One patient with FHF showed 'Pattern II' scintigram. 2) The shunt index (SI) in the normal controls was l.32±1.30%, in AH 10.9±5.7%, in CPH 5.4±2.3%, in CAH 11.8±4.2%, in LC 72.4±21.6%, in HC 39.9±27.2%, and in one FHF 75.4%. 3) Patients with various liver diseases had the significantly higher SI than the normal controls (p < 0.001). Also, the SI in pts. with liver cirrhosis was significantly higher than that of all the other groups (p < 0.001). 4) The mean SI was significantly higher for chronic liver diseases, that were more severe, increasing in the order of CPH, CAH and liver cirrhosis (p<0.001). Also, pts. With AH and CAH showed the significantly higher SI than pts. With CPH (p<0.001), and there was no significant difference in the SI between pts. With AH and CAH (p>0.05). 5) The mean SI was significantly higher in the cirrhotic pts. With varices, encephalopathy, splenomegaly or ascites than in such patient without them (p<0.005). 6) The mean SI in the cirrhotic pts, was calculated according to the modified Child's classification, of which results were that the SI was increased significantly in the order of Grade A, B and C (p< 0.001). 7) In one patient with LC, SI was much decreased from 39.5% before surgery to 7.1% after surgery. The above results suggest that per-rectal portal scintigraphy can be used to evaluate the portal circulation non-invasively and diagnose the portal hypertension in various liver diseases. Also, it can be used to express the degree of any portal hypertension not only by images but also quantitatively, using shunt index, and it is considered useful for the observation of the course of liver diseases and eva]uation of effectiveness of therapy.
원형 커버의 펄스 레이저 용접 후 부품 잔류변형 개선에 관한 유한요소해석
김관우(Kwan-Woo Kim),조해용(Hae-Yong Cho) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.6
Molten zone shape of pulse laser welding is affected by welding conditions such as beam power, beam speed, irradiation time, pulse frequency, etc. and is divided into conduction type and keyhole type. It is necessary to design heat source model for irradiation of laser beam in the pulse laser welding. Shape variables and the maximum energy density value of the heat source model are different depending on the molten zone shape. In this paper, pulse laser welding simulation for joining of cylindrical part and circular cover was carried out. The heat source model for pulse laser beam with circular path was applied to the heat input boundary condition, radiative and conductive heat transfer were considered for the thermal boundary condition. For each phase, thermal and mechanical properties according to temperature were also applied to analysis. Analytical results were in good agreement with the molten zone size of specimen under the same welding conditions. So, the reliability of the welding simulation was verified. Finally, the improvements for reducing residual deformation after cover welding could be reviewed analytically.
이용자의 통행 특성을 고려한 개별 정보 콘텐츠의 편익에 관한 연구
김관우(Kwan-Woo Kim),성수련(Soo-Lyeon Sung),이병주(Byung-Joo Lee) 한국엔터테인먼트산업학회 2014 한국엔터테인먼트산업학회논문지 Vol.8 No.2
국민들의 사회적인 활동이 급속하게 변화하면서 개인들의 통행행동도 과거의 단순한 이동 개념에서 다양한 목적의 활동패턴 개념으로 변화하고 있다. 따라서 이용자 중심의 다양한 정보 제공 시스템을 구현하기 위해서는 정보 이용자들이 필요로 하는 정보 콘텐츠와 편익 가치를 명확하게 파악할 필요성이 있다. 이에 본 연구에서는 개별 정보 콘텐츠의 편익 가치를 평가하기 위하여 대중교통과 자가용 이용자들을 대상으로 통행 목적 및 시점별로 선호하는 정보 콘텐츠 및 상황별 지불의지액을 조사하였다. 그리고 개별 정보 콘텐츠에 대한 상황별 편익추정 모형을 구축하여 이용자들의 편익 가치를 평가한 결과, 대중교통의 정보 콘텐츠는 통근ㆍ통학시(통행 전과 통행 중)에 월 231원, 여행?관광시(통행 전)에 224원, 자가용의 정보 콘텐츠는 통근ㆍ통학시 통행 전 상황에 월 199원, 통행 중 상황에 월 200원, 여행?관광시(통행 전)에 203원의 편익 가치가있는 것으로 분석되었다. 이상의 결과를 종합해 볼 때 이용자들은 여러 활동 단계나 의사결정 과정에서 다양한 정보 콘텐츠를 요구하며, 주어진 상황에 따라 정보 콘텐츠에 대한 편익 가치를 다르게 평가하고 있어 정보 이용자들의 요구와 행동특성에 맞는 다양한 유형의 맞춤형 정보 콘텐츠를 개발하고 제공할 필요성이 있음을 알 수 있었다. Since social activities of the general public have changed dramatically in short time, the pattern of individual travel behavior has shifted. Accordingly, the trip purpose moves from traveling one place to another in the past to multiple activities. Considering all of changes, we should figure out the contents of information which users need and the present worth of benefits which the information provide in order to build a user-friendly information providing system. To this end, a survey of public transport users and car users was conducted on trip purpose, contents of most preferred information based on time frame, and ‘Willingness-to-pay’ for the information they use to figure out the benefits of individual information contents. The benefits were evaluated by using benefit-estimation model for individual information content. According to the survey, there are 231 won and 224 won of monthly benefit value in commutation(pre-trip and on-trip) and traveling respectively in case of public transportation and 199 won, 200 won and 203 won of monthly benefit value in commutation(on-trip, pre-trip) and traveling respectively in the other case. Based on results of the survey, it was found that users want various information during or before transit and the benefits that the benefits were varied following the conditions where the respondents were. Therefore, it is required to develop and provide numerous customized information contents that meet users" demands.
김관우(Kim Kwan Woo),김승재(Kim Seung Jae) 한국스포츠교육학회 2003 한국스포츠교육학회지 Vol.10 No.2
본 연구의 목적은 스포츠교육모형을 적용한 핸드볼 수업 후에 중학생들의 정의적 영역에 어떠한 변화가 있는지를 알아보고 체육 수업의 새로운 방향을 제시하는데 목적을 두고 시도하였다. 연구의 목적을 달성하기 위하여 연구자가 담당하고 있는 중학교 1학년생 106명을 대상으로 하였으며, 실험집단은 스포츠교육 모형을 비교집단은 전통적 수업모형을 적용하였다. 정의적 영역에 대한 검사는 설문지를 통하여 자료을 수집하였다. 연구절차는 실험처치 전 사전검사를 실시하였으며 4주(12시간)간 수업을 실시한 후 사후검사를 실시하였다. 사전·사후검사를 통해 나타난 결론은 다음과 같다. 첫째, 정의적 영역의 수업에 대한 기본적인 태도의 사후검사에서 스포츠교육모형 집단이 전통적 수업모형 집단에 비하여 높은 점수를 얻었으며, 이러한 결과는 스포츠교육모형의 적용이 학습자의 수업에 임하는 태도에 긍정적인 영향을 미친다는 것을 알 수 있다. 둘째, 정의적 영역의 심리적 측면에 대한 사후검사에서 스포츠교육모형 집단이 전통적 수업모형 집단에 비하여 높은 점수를 얻어 유의한 차이가 있는 것으로 나타났으며, 이러한 결과는 스포츠 교육모형의 적용이 학습자의 심리적 측면에 긍정적인 영향을 미친다는 것을 알 수 있다. 셋째, 정의적 영역의 사회적 측면에 대한 사후검사에서 스포츠교육모형 집단이 전통적 수업모형 집단에 비하여 높은 점수를 얻어 유의한 차이를 보였으며, 이러한 결과는 스포츠교육모형이 사회적 측면의 발달에 효과적임을 알 수 있다. The purpose of this study were to clarify what kind of changes were in the affective domain of the middle school students, to suggest the new direction of the physical education class by using the footage of the real-life games in teaching. To achieve these purposes, this study selected 106 students from the first grade of Ⅰ middle school in I county and divided them into two groups, which were the experimental group and comparison one. The former was subjected to the sports-education model and the latter the general teaching model. The conclusions which have been gained through the comparing and analyzing the result of the both tests are as followings. First, as for the post-test about the basic attitude toward the affective domain class, the sports education model group got higher mark in all items than the traditional teaching model and from this result we can see the application of the sports-education model have a positive effect on the attitude of the learners` preparing for the class. Second, as for the post-test about the psychological aspect of the affective domain, the sports education model group got higher mark in all items than the traditional teaching model, which proved to be a meaningful difference. This result represents the application of the sports education model have a positive effect on the psychological aspect. Third, as for the post-test about the social aspect of the affective domain, compared with the traditional teaching model, the sports education model group got high score in all, which proved to be a meaningful difference. This result means the sports education model is effective in developing the social aspect.