A Numerical Simulation of Hydrodynamic Interactions Between Two Moored Barges with Regular Waves

이상도,배병덕,김대해,Lee, Sang-Do,Bae, Byung-Deug,Kim, Dae-Hae The Korean Society of Marine Environment and safet 2016 해양환경안전학회지 Vol.22 No.6

본 연구는 해상에서 근접하여 계류된 직사각형 박스 형상의 두 바지선을 대상으로 유체역학적 상호작용으로 인한 선체운동 응답특성을 분석하기 위하여 수치시뮬레이션을 실시하였다. 이 수치시뮬레이션 실험에서는 DNV-GL의 SESAM 수치해석솔루션을 사용하여 결합된 강성 메트릭스항(coupled stiffness matrix terms)을 다중물체 모드(multiple body modes)의 surge 방향에 추가하였고, 실험에 적용한 바지선 모델의 1차 방사 및 산란 영향을 계산하기 위하여 퍼텐셜 이론을 적용하였다. 실험 결과, 두 바지선의 횡간격 20 m, 횡파 실험조건 경우에 1.3 rad/s에서 실험선의 피난효과(sheltering effect)가 나타나지 않았다. 실험 모델 상호간 횡간격의 영향은 종파와 천수역 실험 조건에서 분명하게 나타났지만, sway force는 횡파일 경우에 두 실험 모델선과의 접근거리 간격에 영향을 받았다. 실험모델의 횡간격이 좁아지면 종파와 사파의 경우에 sway, heave 운동과 sway force의 피크는 높은 주파수대로 이동하였다. 수심이 10 m일 때 풍하측 바지선의 sway 운동은 횡파와 사파의 경우에 0.2-0.8 rad/s 주파수대에서 큰 차이를 보였으며, 입사파의 방향이 달라져도 sway force의 피크는 보다 낮은 주파수대에서 나타났다. In this study, two rectangular barges in close proximity were simulated to analyze the characteristics of motion responses due to hydrodynamic interactions. Using a numerical solution from DNV-GL SESAM, coupled stiffness matrix terms for these same FEM models were added to the multiple body modes in the surge direction. Potential theory was used to calculate the first order radiation and diffraction effects on the simulated barge models. In the results, the sheltering effect of the barges was not shown at 1.3 rad/s with hull separation of 20 m in transverse waves. The separation effect between the barges was more clear with longitudinal waves and a shallow water depth. However, sway forces were influenced by hull separation with transverse waves. The peaks for sway and heave motion and sway force occurred at higher frequencies as hull separation narrowed with longitudinal and transverse waves. Given a depth of 10 m, the sway motion on the lee side of a coupled barge made a significant difference in the range of 0.2-0.8 rad/s with transverse and oblique waves. Also, the peaks for sway force were situated at lower frequencies, even when incident waves changed.

어린이집,유치원교사의 직무스트레스 및 대처방식

이상복 ( Sang Bok Lee ),도명애 ( Myung Ae Do ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2010 정서ㆍ행동장애연구 Vol.26 No.4

이 연구는 어린이집·유치원의 일반학급과 통합학급을 담당하고 있는 어린이집·유치원교사의 직무스트레스를 구체적으로 비교하는 데 목적이 있다. 연구의 대상은 부산시, 대구시, 울산시, 경북, 경남지역을 중심으로 420개 기관의 어린이집·유치원교사 800명을 대상으로 하였다. 어린이집·유치원교사의 직무스트레스 정도는 모든 교사에게 평균 이상으로 높게 나타났다. 직무스트레스를 비교 분석하면 학부모와의 관계에서 가장 높은 스트레스 수준을 보이고, 교사 자신의 내적 갈등, 스트레스의 신체적 증상, 영·유아 행동, 시간 관리상의 어려움, 행정적 관리자와의 관계, 스트레스의 심리/정서적 증상, 교사 상호간의 관계 순으로 나타났다. The purpose of this study is to specifically compare the job stress of the teachers in the child day care centers and kindergartens who take charge of the regular and the integrated classes in the child care centers and the kindergartens. The subjects of the study were 800 teachers from the 420 early childhood educational facilities in the cities of Busan, Daegu, Ulsan and the Provinces of Kyungbuk and Kyungnam. The study, identifying teachers` job stress and their coping strategies particularly, was proceeded focusing on the analysis of correlations between the two. The conclusions of the study are as follows. The job stress level of the teachers in the child day care centers and kindergartens is above the average in general. According to the analysis, the job stress from the relationship with the parents of kids shows the highest level, following self-conflict of the teachers themselves, physical symptoms from the stress, child`s behavior, hardship in time management, relationship with managerial administrator, symptoms of psychological/emotional stress out, and the mutual relations among the teachers.

폐흡충증의 임상상 및 효소면역측정법의 진단적 가치

이상도(Sang Do Lee),유철규(Chul Gyu Yoo),한성구(Sung Koo Han),심영수(Young Soo Shim),김건열(Keun Youl Kim),한용철(Yong Chol Han),김영환(Young Whan Kim),조승열(Seung Yull Cho) 대한내과학회 1989 대한내과학회지 Vol.37 No.1

N/A Pulmonary paragonimiasis is a chronic lung disease caused by trematodes of the genus Paragonimus. It was highly endemic in Korea until the late 1960s; thereafter the prevalence has been markedly decreased. However, human paragonimiasis is still occurring and is one of the lung disease which needs differential diagnosis. This study was undertaken to renew our knowledge of the recent characteristics of pulmonary paragonimiasis in Korea by reviewing 76 patients diagnosed during the past 10 years (1979-1988) at Seoul National University Hospital (SNUH). The final diagnosis was based on either egg detection or positive serologic test by ELISA for Paragonimus-specific antibody (IgG) in serum. Chronic cough, blood-tinged sputum, dyspnea and chest pain are major presenting symptoms. In 6 patients, however, no subjective respiratory symptoms were shown; they were found during a routine chest X-ray examination. In half of all patients it took more than 6 months to obtain the correct diagnosis. The majority of previous misdiagnosis was pulmonary tuberculosis, but lung cancer, acute bronchitis, eosinophilic granuloma, etc were also suspected. When the results of egg detection and ELISA were compared, the sensitivity of the serologic test was 92%. The antibody titer by ELISA tended to return to its normal range in 6 months to 1 year after praziquantel treatment. This result warrants the differentiation of old cured paragonimiasis from the active disease which is frequently impossible by the intradermal test. Probably because we adopted ELISA results in the final diagnosis, pleural involvement constitutes a higher percentage (71%) in our series than in previous reports. It was found that paragonimiasis should be ruled out in patients with simultaneous bilateral hydropneumothorax. By praziquantel treatment, immediate improvement of the presenting symptoms was obtained in all but 4 patients in whom relapse reguired retreatment. Improvement in the findings on chest X-ray was delayed. The above results show that suspicion of paragonimiasis is very important for correct etiologic diagnosis as with other uncommon infectious diaeases which need specific chemotherapy.

급성 폐동맥색전증과 성인성호흡곤란증후군에서 산소운반과 산소섭취의 상관관계

이상도 ( Lee Sang Do ),한성구 ( Han Seong Gu ),심영수 ( Sim Yeong Su ),김건열 ( Kim Geon Yeol ),한용철 ( Han Yong Cheol ) 대한내과학회 1993 대한내과학회지 Vol.44 No.4

연구배경 : 성인성 호흡곤란증후군에서 PEEP을 적용할 때 산소운반을 최대로 하려는 노력은 결국 조직에서의 산소섭취를 최대로 하기 위해서이며, 이는 조직의 산소섭취가 산소운반에 비례한다는 가정에 근거하나 이에 대해서는 아직 이견이 많다. 한편 성인성 호흡곤란증후군과는 호흡부전의 기전이 다른 급성 폐동맥색전증에서 산소운반과 산소섭취의 상관관계에 대해서는 아직 알려진 바 없다. 방법 : 성인성 호흡곤란증후군과 급성 폐동맥색전증에서 산수운반과 산소섭취의 상관관계를 밝히고자 한국산 잡견 14마리중 7마리에는 oleic acid를 정주해 성인성호흡곤란증후군을 유발하고 나머지 7마리에는 자가혈병을 이용해 급성 폐동맥색전증을 유발한 후 PEEP 수준을 변화시키며 환기 및 혈류역학의 제지표를 측정해 다음과 같은 결과를 얻었다. 결과 : 1) 산소운반과 산소섭취 : ARDS군은 12~28ml/min/kg 의 산소운반 범위에서 산소운반의 감소에 따른 산소섭취의 감소를 관찰할 수 있었고, 산소운반의 변화와 산소섭취의 변화사이에는 유의한 상관관계가 있었다(r=0.55, p<0.05). 산소추출률(oxygen extraction ratio)과 산소운반 사이에는 유의한 상관관계가 없었다. 급성 폐동맥색전증군에서 역시 7~29ml/min/kg의 산소운반 범위에서 산소운반의 감소에 따른 산소섭취의 감소를 관찰할 수 있었고, 산소운반의 변화와 산소섭취의 변화 사이에 유의한 상관관계가 있었다(r=0.57, p<0.05). 산소추추률과 산소운반 사이에는 유의한 상관관계가 없었다. 2) 혼합정맥혈 산소분압 : ARDS군에서 산소운반의 변화와 혼합정맥혈 산소분압의 변화 사이에는 유의한 상관관계가 있었고 (r=0.79, p<0.05), 혼합정맥혈 산소분압의 변화와 심박출량의 변화사이에도 유의한 상관관계가 있었다(r=0.75, p<0.05). 급성 폐동맥색전증군에서 역시 산소운반의 변화와 혼합정맥혈 산소분압의 변화 사이에는 유의한 상관관계가 있었고(r=0.83, p<0.05), 혼합정맥혈 산소분압의 변화와 심박출량의 변화사이에도 유의한 상관관계가 있었다(r=0.72, p<0.05). 결론 : 이상의 결과로 산소공급에 대한 조직에서 산소 섭취의 의존성은 성인성 호흡곤란증후군에 국한된 현상이 아니고 급성 폐동맥색전증에서도 관찰되며, 혼합정맥혈 산소분압은 이 두 질환에서 조직에의 산소공급의 변화를 예견할 수 있는 유용한 지표로 생각된다. Background: In adult repiratory distress syndrome(ARDS) the pathologi supply dependence of oxygen consumption, whoch provide the basis for `best PEEP`, is suggested, but which is still in controversy. And in acute pulmonary embolism little is known about the relationship betwen oxygen transport and oxygen consumption. Methods: To evaluate the relationship betwen oxygen transport and oxygen consumption in ARDS and acute pulmonary embolism, experimental ARDS was induced in 7 mongrel doges with oleic acid and acute pulmonary emblism in 7 dogs with autologous blood clot. Then hemodynamic and gas exchange parameters were measured with serial increment of PEEP. Results: In ARDS group, blow the oxygen transport of 28 ml/min/kg, the change of oxygen consumption was linearly related to the change of oxygen transport(r=0.55, p<0.05). Oxygen extraction ratio didn`t correlate with oxygen transport. In acute pulmonary embolism group, below the oxygen transpot of 29ml/min/kg, change of oxygen consumption was linearly relatred to change of oxygen transport(r=0.57, p<0.05). Oxygen extraction ratio didn`t correlate with oxygen transport. In ARDS group there was a significant correlation between the change of oxygen tension (r=0.79, p<0.05). In acute pulmonary embolism group there was a significant correlation between the change of oxygen transport and change of mixed venous oxygen tension (r=0.83, p<0.05). Conclusion: These data suggest that a linear relationship between oxygen consumption and oxygen transport is not unique to ARDS. Mixed venous oxygen tension seems to be sensitive predictor of oxygen transport in both ARDS and acute pulmonary embolism.

인터넷 활용을 통한 영어 습득 능력 향상 방안

이상도 ( Sang Do Lee ),정우섭 ( Woo Seop Jung ) 글로벌영어교육학회 2001 Studies in English education Vol.6 No.2

The growth of the Internet is bringing many changes to English education. There are many beneficial factors in teaching English through the Internet. The Internet allows students to use lots of information and resources with multiple sites networked. It can stimulate students` learning motivation and interest, and improve their problem solving ability. So, the Internet provides students and teachers with lots of opportunities in the field of English education. In using the Internet, there are also several disadvantages. First, students with a lack of computer skills might have technical problems. Second, English has become the main language of the Internet, so students with low reading and writing proficiency in English might find it difficult to be motivated in a class. Many researchers have proved that as we move into the 21st century, using the Internet is indispensable and become increasingly important in English education. Therefore, it is necessary that English teachers change their roles and attitudes in teaching English through the use of the Internet.

公務上祕密漏泄罪에 있어서 祕密의 意義

李相燾(Sang-Do Lee) 한국법학원 1997 저스티스 Vol.30 No.3

초음파를 이용한 이성분 고분자 용액의 상거동에 관한 연구

이상대(Sang Dai Lee),문경식(Kyoung Sik Moon),최형도(Hyoung Do Choi),윤호규(Ho Gyu Yoon),문탁진(Tak Jin Moon) 한국고분자학회 1997 폴리머 Vol.21 No.2

컨디셔닝 공정에 의한 연마 패드 형상 변화의 기구학 해석에 관한 연구

이상직(Sang-Jik Lee),서헌덕(Heon-Deok Seo),오지헌(Ji-Heon Oh),김형재(Hyoung-Jae Kim),정해도(Hae-Do Jeong) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-

The pad is one of the most important components in the polishing process. The mechanical properties of the pad determine the removal rate and the polishing characteristics. The asperities on the pad surface involve with the mechanical removal from the workpiece surface and the pad profile is affecting the flatness across the workpiece. However, as the polishing is going on, the pad asperities are gradually worn down and the glazed area increases. The removal rate is reduced and the polishing quality becomes poorer due to the pad surface degradation. Therefore, the pad conditioning process is necessary to regenerate the pad surface by breaking up the glazed. The most common conditioning method is to use a rotating disk coated one side with diamond abrasives. The pad surface is restored by the pad cutting of the diamond abrasives. The accumulation of these cutting by the diamond conditioning is unfortunately affecting the profile of the polishing pad, which results in the unstable polishing results. This paper describes the kinematical model for the pad wear and analyzes the effects of kinematical and geometrical parameters in the pad conditioning process using the diamond disk. The kinematical modeling results were correlated with the actual pad profile induced by the pad conditioning.

결장 및 직장에서 발생한 원발성 림프종

이상달(Sang Dal Lee),권도성(Do Seong Kwon),목영재(Young Jae Mok),최상용(Sang Yong Choi),문홍영(Hong Young Moon) 대한외과학회 1996 Annals of Surgical Treatment and Research Vol.51 No.2

Apple II P.C.를 이용한 Video Image Processing과 인체계측 및 동작분석에의 응용

이상도,정중선,이근부,Lee, Sang-Do,Jeong, Jung-Seon,Lee, Geun-Bu 대한인간공학회 1985 大韓人間工學會誌 Vol.4 No.1

The object of this research is to develop an Interactive Computerized Graphic Program for graphic output of velocity, acceleration and motion range of body-task reference point (e.g., C.O.G., joint location, etc.). Human motions can be reproduced by scanning (rate = 60Hz) the vidicon image, and the results are stored in an Apple II P.C. memory. The results of this study can be extended to simulation and reproduction of human motions for optimal task design.