동맥경화에 의한 하지 허혈증 환자에서 Subintimal Angioplasty의 효과 : 단기 추적 결과를중심으로

윤상섭,허윤정,최승혜,박종경,이성,송경섭 대한혈관외과학회 2003 Vascular Specialist International Vol.19 No.2

인터넷을 통해서 본 미국 고등학교의 생물교육 내용 분석

윤한선,김종균,김현섭 공주대학교 사범대학 과학교육연구소 1999 과학교육연구 Vol.30 No.1

컴퓨터 통신과 인터넷에 힘입어 앞으로의 교육은 온라인 교육이 보편화될 것이다. 생물 교육에도 온라인 교육이 교육의 한 형태로 자리매김할 것으로 예상되므로 인터넷상의 학습 정보가 어느 정도인가를 파악하는 것은 매우 의미있는 일이라 생각된다. 따라서, 본 연구는 우리 나라보다 인터넷이 먼저 도입되고 또 많은 정보가 실려 있는 미국 고등학교 홈페이지의 생물 교과 내용을 조사 및 분석하여 우리 나라 고등학교의 생물 교과 온라인 교육 자료 제작에 참고할 수 있도록 함으로써 생물 교과의 수업에 조금이나마 도움을 주는 데 목적을 두고 수행되었다. 생물 교과 내용이 우수한 고등학교를 선정하기 위해서 미국에서 일반적으로 많이 적용하고 있는 4개의 홈페이지에 실린 19개 Topic을 기준으로 삼았다. 미국의 고등학교 홈페이지에 실린 내용이 그 기준에 어느 정도 접근하였는지를 조사하여, 접근률이 가장 큰 것에서부터 10개의 홈페이지를 선정, 그 내용을 분석하였다. 그 결과는 다음과 같다. 1. 미국 고등학교 훔페이지에는 학생들이 스스로 공부할 수 있는 생물 교과 내용이 충분히 있었고, 각 Topic에는 관련 사이트들이 많이 연결되어 있어서 각자의 능력에 맞는 내용을 선택하여 이용할 수 있게 되어 있었다. 2. 또한 전자우편을 통하여 질문과 답변뿐만 아니라 시험문항에 대한 답을 교환할 수도 있었다. 3. 표준으로 삼은 4개의 홈페이지와 상위 10개 홈페이지에 주로 소개되는 Topic은 Classical Genetics, The Cell, Biological Evolution, Chemistry of Life, Plants, Molecular Basis of Heredity, Energy, Diversity of Organisms, Behavior of Organisms, Cellular Respiration의 순서로 나타났는데, 이들 내용은 우리 나라 고등학교의 생물 교과 온라인 수업에 이용될 내용을 선정하는 데 참고로 삼을 만하였다. The continuous development of internet makes us not only use many types of information such as letters, pictures, sounds, animations and video-visions synthetically, but ?? communicate with each other. In a short time, we will make use of the computer with multimedia instead of the blackboard in education. And the on-line education will be world-wide by the help of telecommunication and internet. Naturally, it also will be applied to biology education. The purpose of this study is to analyze the homepages of the United States high school in order to help building up the data-base for high school biology curriculum of our country. For this study, we first investigated the references. Next, we classified and standardized the curriculums of the United States high school. After that, we searched for the high school home pages in the registered engine. Finally, we selected and analyzed the home pages close to the standard biology curriculum of them. The analyzed results were as follows. 1. The homepages of the United States high school were contained much biology related contents, and linked to various related topic sites including many animations to stimulate interest of students. It means that United States high school make good use of internet for the biology learning. 2. The homepags of the United States high school were also contained the teaching plan, the informations and questions for examination so that students may catch the way of learning. 3. It may be possible that students self-study using them. because the homepages were composed of the simple and systematic structure.

원자력발전소 케이블관통부 충전시스템 평가용 소프트웨어 개발 Ⅰ

윤종필,권성필,조재규,윤인섭 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

본 논문은 원자력발전소 방화벽에 설치된 케이블관통부 충전시스템(CPFS: Cable Penetration Fire Stop)안에서 일어나는 동적 열전달 현상을 해석하기 위해 수행된 실험을 다루고 있다. Dow Coming사의 내화성 충전물에 대해서 내화실험이 수행되었으며, 본 실험을 통해 준비된 CPFS 시험체가 성능위주 시험방법인 ASTM I-81처 F-rating과 I-rating을 동시에 만족시킬 수 있는지를 알아보았다. 그리고 여기서 얻어진 실험결과는 CPFS시스템 내화성능 평가용 소프트웨어를 개발하기 위해 사용되었다. CPFS 시스템 내에서의 열전도 현상은 주어진 초기조건과 경계조건하에서 Parabolic PDE(Partial differential equation)로 수식화 되었으며, 이렇게 수식화된 PDE는 다시 연속과완화법(SOR: Sequential over-relaxation)과 Galerkin 유한요소법(FEM: Finite element method)로 구성된 혼합알고리즘에 따라 풀 수 있었다. PDE을 풀기 위해 널리 사용되고 있는 상응소프트웨어 Femlab을 이용하여 방화시스템 내에서의 온도분포를 계산하여 3차원 그래픽으로 나타내었다. 특히 CPFS시스템 내에서의 시간의 경과에 따른 온도분포의 변화에 대한 실험과 수치해석을 병행함으로써 결과에 대한 신뢰성을 높일 수 있었다. In this work the dynamic heat transfer occurring in a cable penetration fire stop system built in the firewall of nuclear power plants is three-dimensionally investigated to develop a test-simulator that can be used to verify effectiveness of the sealants. Here was carried out an experiment to observe the heat transfer in the cable penetration fire stop system made of DOW CORNING products. The dynamic heat transfer occurring in the fire stop system is formulated in a parabolic partial differential equation subjected to a set of initial and boundary conditions. And it was modeled. simulated, and analyzed. The simulation results were illustrated in three-dimensional graphics and were compared with experimental data. Through the simulations, it was shown clearly that the temperature distribution was influenced very much by the number, position, and temperature of the cable streams. It also was found that the dynamic heat transfer through the cable streams was one of the most dominant factors, and the feature of heat conduction could be understood as an unsteady-state process. It is certain that these numerical results are useful for making a performance-based design for the cable penetration fire stop system.

발생원별에 따른 PAHs 배출특성

박찬구,윤중섭,김민영,손종열,모세영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The results of individual PAH source profiles that can be applied to receptor model are as follows. The sum of 16 PAH concentrations was 391.41 ng/S㎥ in a tunnel. Phenanthrene was the most abundant compound among 16 PAH, and then pyrene, fIuoranthene, anthracene, and naphthalene can be seen in elevated contents. 11,056.61 ng/S㎥ of 16 PAH concentrations in BC oil boiler was two times higher than 6,582.57 ng/S㎥ of those in LNG boiler. Naphthalene was the most abundant compound in both facilities. Phenanthrene, anthracene. and acenaphthylene were the second dominant compound group in order from both facilities. BC oil boiler had relatively high concentration of pyrene compared to LNG boiler that had high concentration of fluorene and did not detect pyrene. The sum of 16 PAH concentrations emitted from MSW incinerators after APCD (air pollution control device) was three times higher than those from MSW incinerators bcfore APCD. However, the concentrations of more than 4-ring PAH compounds (e.g., benzo (a)anthracene) before APCD were higher than those after APCD. This fact implies that PAHs generated by combustion process are eliminated in APCD and they are continuously produced in stack or atmosphere by PAHs precursors.

구강 악성 흑색종에서 PCNA 발현에 관한 면역조직화학적 연구

황경균,남윤우,이재일,이종호,심광섭,김명진 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6

Malignant melanoma arising from the mucosa of head and neck region was rare and showed poor prognosis. Some of malignant melanoma were transformed from benign melanotic lesion. Malignant melanoma had high cellular proliferation and rapid growth. The percentage of PCNA-positive cell (labeling index) is high in many malignant tumor. So we compared the pattern of PCNA expression in the melanotic lesion. We performed the immunohistochemical study in malignant melanoma(19 cases), benign melanotic macule(24 cases) and normal mucosa(20 cases) were diagnosed in Seoul National University Dental Hospital between 1980 and 2000. Positive PCNA staining was found mainly in malignant melanoma. The mean PCNA expression in malignant melanoma, melanotic macule, normal tissue were 29.2%, 1.4%, 0%, respectively. Significant differences in PCNA expression were noted between malignant melanoma and melanotic macule(p<0.01), normal mucosa(p<0.01). These result suggested that the PCNA expression seems to be used as a diagnostic indicator for malignancy in malignant melanoma and melanotic lesion.

人文·社會科學 系列의 大學 敎課科目에서 地域硏究로서의 「美國學」이 차지하는 그 內容과 範圍에 대한 하나의 分析的 評價硏究

柳盛根,梁琮懿,宋玄州,尹瑾燮,黃明澤 全北大學校 商科大學 附設 産業開發硏究所 1975 상과대학論文集 Vol.5 No.-

하계 실내 및 실외환경의 공기 중 휘발성 유기화합물 농도 및 개인노출

양원호,손부순,박종안,장봉기,박완모,김윤신,어수미,윤중섭,류인철 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9

Volatile organic compounds (VOCs) are present in essentially all natural and synthetic materials from petrol to flowers. In this study, indoor and outdoor VOCs concentrations of houses, offices and internet-cafes were measured and compared simultaneously with personal exposures of each 50 participants in Asan and Seoul, respectively. Also, factors that influence personal VOCs exposure were statistically analyzed using questionnaires in relation to house characteristics, time activities, and health effects. All VOCs concentrations were measured by OVM passive samplers (3M) and analyzed with GC/MS. Target pollutants among VOCs were Toluene, o-Xylene, m/p-Xylene, Ethylbenzene, MIBK, n-Octane, Styrene, Trichloroethylene, and 1,2-Dichlorobenzene. Indoor and outdoor VOCs concentrations measured in Seoul were significantly higher than those in Asan except Ethylbenzene. Residential indoor/outdoor (I/O) ratios for all target compounds ranged from 0.94 to 1.51 and I/O ratios of Asan were a little higher than those of Seoul. Relationship between personal VOCs exposure, and indoor and outdoor VOCs concentrations suggested that time-activity pattern could affect the high exposure to air pollutant. Factors that influence indoor VOCs level and personal exposure with regard to house characteristics in houses were building age, inside smoking and house type. In addition insecticide and cosmetics interestingly affected the VOCs personal exposure. Higher exposure to VOCs might be caused to be exciting increase and memory reduction, considering the relationship between measured VOCs concentrations and questionnaire (p<0.05).

분뇨처리장의 공정개선에 의한 처리효율 향상에 관한 연구

이찬원,김승현,김창수,문성원,전홍표,윤종섭 한국환경과학회 2004 한국환경과학회지 Vol.13 No.6

There is a need to improve the efficiency of the existing sanitary treatment facilities, because the effluent standard becomes more stricter and septic sludge increased. Thus, operating processes of sanitary treatment system in M city changed with installation of additional facilities. Process modifications were as follows: Dilution water was added to the next process after primary aeration tank. Some secondary sedimentation sludge was recycled to primary aerator so that most of the organics were stabilized in primary aeration tank under automatic control of dissolved oxygen. The line of effluent from dewatering process flowing to the activated sludge tank was changed to the primary aerator. The primary sedimentation sludge line was linked to a thickener. Polymer was added to the activated sludge tank. The effluent of primary aerator and aerobic digester was recycled from the 5th to the 1st sector. As consequencies of above process modifications, the improvement of removal efficiency was achieved as BOD 54%, COD 42%, SS 61%, T-N 39%, and T-P 12%, respectively.

갑상선 수술의 해부학적 지표로서의 Zuckerkandl 결절의 중요성

윤지섭,정종주<SUP>1<,SUP>,이용상<SUP>1<,SUP>,남기현<SUP>1<,SUP>,정웅윤<SUP>1<,SUP>,장항석<SUP>1<,SUP>,박정수<SUP>1<,SUP>,Ji-Sup Yun,Jong Ju Jeong,<SUP>1<,SUP>,Yong Sang Lee,<SUP>1<,SUP>,Kee Hyun Nam,<SUP>1<,SUP>,Woong You 대한갑상선-내분비외과학회 2007 The Koreran journal of Endocrine Surgery Vol.7 No.4

Purpose: Zuckerkandl's tubercle (ZT) of the thyroid gland is a well-documented anatomical structure. This study evaluated the anatomical relationship of the ZT in terms of the recurrent laryngeal nerve (RLN) and the superior parathyroid gland (SP). Methods: The study included 325 patients (ten patients with benign tumors and 315 patients with malignancies) who underwent thyroid surgery between February and June 2007. Tubercles were classified according to size: Grade 0 (unrecognizable), Grade I (≤ 5 mm), Grade II (6∼10 mm) and Grade III (>10 mm). The incidence and size of the ZT and its positional relationship to the RLN and SP were investigated during thyroid surgery. Results: ZTs were identified in most patients (right thyroid 89.3%, left thyroid 85.6%). The percentageof tubercles according to grade and location was as follows: Grade 0, right thyroid 10.7% and left thyroid 14.4%; Grade I, right thyroid 7.9% and left thyroid 11.1%; Grade II, right thyroid 43.5% and left thyroid 38.5%; Grade III, right thyroid 37.9% and left thyroid 35.9%. The most common RLN course was in a groove between the ZT and the main body of the thyroid. Most of the SPs are situated cranial to the ZTs and were located at the 1 or 2 o'clock position (96.1%) in the left thyroid and at the 10 or 11 o'clock position (95.2%) in the right thyroid. A greater distance between the ZT and the SP was seen with a decreasing size of the ZT. Conclusion: The ZT was identified during most thyroidectomies, and there was a constant relationship between the ZT and either the RLN or SP. Therefore, identification of the ZT and an understanding of the relationship between the ZT and either the RLN or SP are essential for the performance of safe thyroid surgery. (Korean J Endocrine Surg 2007;7:237-241)

Effect of Surrogate Aggregates on the Thermal Conductivity of Concrete at Ambient and Elevated Temperatures

Yun, Tae Sup,Jeong, Yeon Jong,Youm, Kwang-Soo Scientific World, Inc 2014 The Scientific World Journal Vol.2014 No.-

<P> The accurate assessment of the thermal conductivity of concretes is an important part of building design in terms of thermal efficiency and thermal performance of materials at various temperatures. We present an experimental assessment of the thermal conductivity of five thermally insulated concrete specimens made using lightweight aggregates and glass bubbles in place of normal aggregates. Four different measurement methods are used to assess the reliability of the thermal data and to evaluate the effects of the various sensor types. The concrete specimens are also assessed at every 100°C during heating to ~800°C. Normal concrete is shown to have a thermal conductivity of ~2.25Wm<SUP>-1</SUP> K<SUP>-1</SUP>. The surrogate aggregates effectively reduce the conductivity to ~1.25Wm<SUP>-1</SUP> K<SUP>-1</SUP> at room temperature. The aggregate size is shown not to affect thermal conduction: fine and coarse aggregates each lead to similar results. Surface contact methods of assessment tend to underestimate thermal conductivity, presumably owing to high thermal resistance between the transducers and the specimens. Thermogravimetric analysis shows that the stages of mass loss of the cement paste correspond to the evolution of thermal conductivity upon heating. </P>