원위 대퇴골의 고립성 골연골종에서 발생한 속발성 연골 육종 1례 보고

정필현,황장수,강석,김용민,오형호,채동주,김종필 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

연골육종은 비교적 서서히 자라며 늦게 전이하는 악성 연골 종양으로 알려져 있다. 골 연골종에서 발생한 속발성 연골육종은 발생빈도는 드물며 타부위로의 전이가 적고 악성도가 낮은 경우가 많아 적합한 수술적 치료로서 좋은 예후를 보이는 것으로 보고되고 있다. 본 동국대학교 정형외과학 교실에서는 우측 대퇴골 원위부 골간단부에 생긴 고립성 골 연골종에서 이차적으로 발생한 연골육종을 치험한 바 문헌고찰과 함께 보고하는 바이다. A case of Secondary Chondrosarcoma Arising from Solitary Osteochondroma of the Distal Femur Department of Orthopaedic Surgery, College of Medicine, DongGuk University Phil Hyun Chung M.D., Jung Su Hwang M.D., Suk Kang M.D., Yang Mln Kim M.D., Hyung Ho Oh M.D., Dong Ju Chae M.D., Jong Pil Kim M.D. Chondrpsarcoma is a malignant cartilage-forming tumor that grows slowly and metastasis of this tumor occurs in late stage. Secondary chondrosarcomas arising from a solitary osteocartilaginous exostosis are rare and those have a better prognosis than other chondrosarcomas, and they rarely metastasize. We present our experience with a case of secondary chondrpsarcoma arising in solitary osteochondroma of distal metaphysis of right femur with clinical details.

서울시 소음공해 현황과 이에 대한 주민의 인식정도

정인희,이효수,김동수,김흥식 한국환경과학회 1997 한국환경과학회지 Vol.6 No.6

Nine districts in Seoul were chosen randomly and a questionnaire containing 23 questions was distributed to survey the perception of noise pollution by the citizens. The results were primarily analyzed to understand the perception of Seoul citizen as a whole, and then analyzed according to 4 demographic variables -district area, age, gender and occupation -to see if there were any possible relation between nonnoise variables and noise annoyance. Actual noise level data measured by the city government were used to compare quantified noise level with the surveyed people's perception. It was found that people consider road traffic noise to be the main source of noise pollution in Seoul and that most people have experienced annoyance in everyday life. Also it was verified that the responsibility for noise control should be on both city government and the individuals, but it was generally considered that very little effort is actually put into solving noise pollution from both groups. From the survey, it could be analyzed that demographic variables do affect people in the awareness of noise pollution, and that one's sensitivity and annoyance due to noise increase as one ages. From the study, it was concluded that noise pollution is not considered currently as a hazardous problem to most Seoul citizens, however specific noise reduction policies, especially regarding road traffic noise, should be put into practice in the near future.

반복하중을 받는 철근의 부착 응력도에 관한 실험적 연구

정란,박현수,조동철 단국대학교 신소재기술연구소 1991 신소재 Vol.1 No.-

지진하중에 대한 철근콘크리트 구조물의 거동을 예측하기 위해 지금까지 진행하였던 많은 실험들이 단순증가 반복하중을 작용시키고 있다. 그러나 실제 지진에 의해 발생되는 하중은 불규칙 반복하중으로써 이전까지 관례적으로 행해졌던 규칙적인 단순증가 반복하중에 의한 실험결과가 얼마만큼 신빙성이 있는가를 검토할 필요가 있다. 본 연구에서는 지진하중에 대한 실험에서는 어떠한 하중을 가져야 실제 거동과 근사한 결과를 얻을 수 있는가를 예측하기 위하여 철근콤크리트 구조물의 구조적 취약부분인 보-기둥 접합부에 규칙적인 단순증가 반복하중과 불규칙 반복하중을 작용시켜 접합부의 부착응력도의 분포를 비교 분석하였다. The prediction and estimation of R/C structure behavlor subjected to earthquake type loading is partly based on the experimental results of the monotonically increased cyclic loading, rather than that of the irregularly increased cyclic loading. However, actual earthquake is typical random vibration. In this respect, comparing and analysing experimental test results of R/C specimens subjected to monotonically increased cyclic loading and irrcgularly increased cyclic loading, this study proposes the research direction of irregularly increased cyclic loading during earthquake.

문제만들기(problem posing)활동을 통한 수학의 학습 지도

정동권,박정수 仁川敎育大學校 科學敎育硏究所 1998 과학교육논총 Vol.10 No.-

In the mathematics education, problem posing has been noticed as a method to achieve the various objects of curriculum and as an object itself. That is, it is has been regarded as an efficient step to develop the ability of mathematical thinking and of problem solving. However, up to now teachers didn't take several advantages of problem posing in the mathematics classroom since they made mostly children solve the ready made and given problems in accordance with the fixed algorithm. In this study we have aimed to improve such a realistic circumstances of our mathematics education, and hence instructed children in the division of fractions by utilizing positively their problem posing activity. Subsequently we analyzed the result of the instruction, and made some overtures.

중공유리구에 고정화된 광촉매를 이용한 남조류의 증식억제

강민수,정익상,우승희,김성우,이동근 경상대학교 환경보전연구소 2001 環境保全硏究所報 Vol.9 No.-

Photocatalytic inactivation of Microcystisaeruginosa was carried out with the TiO₂-coated pyrex hollow glass beads under the illumination of UV light(370㎚ wavelength). After being irradiated with UV light in the presence of the TiO₂-coated pyrex glass beads, Microcystis aeruginosa, known as typical cyanobacteria, lost their photosynthetic activity, and the colonies of Microcystis cells were completely separated into individual spherical one. Complete photocatalytic inactivation of Microcystis aeruginosa was obtained in about 30min. Photosynthesis activity of the cyanobacteria could be inhibited effectively after being reacted photocatalytically with TiO₂ immobilized hollow glass ball.

건물내장재(석고보드,합판)의 화재성능평가

김충환,김종훈,김운형,하동명,이수경 한국화재소방학회 2001 한국화재소방학회논문지 Vol.15 No.3

본 연구는 국내와 외국의 건물 내장재 화재성능평가방법을 고찰하고 국내에는 도입되지 않은 실대 화재 실험인 Room Corner Test를 국내 내장재중 석고보드와 합판을 대상으로 그 적용성을 위한 실험을 진행하였다. 현재 국내 내장재의 평가규정은 Bench-Scale Test에 의존하고 있으나, 미국, 일본 유럽등에서는 Room Corner Test를 적용한 실질적인 재료의 화재성능평가를 시행하고 있다. 실험 결과, NFPA 265에 의한 석고보드 및 ISO 9705에 의한 합판의 성능은 양호한 것으로 판단되었다. 현재 국내 내장재에 적용되는 등급분류의 평가방법은 재료의 실제 화재성능 평가에 한계가 있으므로 향후 Room Corner Test의 적용과 더불어 Bench-Scale Test 결과를 토대로 화재성능을 예측하는 화재모델을 이용하는 평가 방법의 도입이 필요하다. The fire performance evaluation methods in Korea and overseas for interior finish materials were analysed and tested with gypsum board and plywood by using room corner test not adopted by domestic code until now. The results of gypsum board (thickness: 8 mm) and plywood (thickness: 4 mm) applying NFPA 265 and ISO 9705 test respectively are satisfied the assessment criteria. To assess a actual fire performance and classify fore hazard levels for interior finish materials, room-corner test and flame spread models should be adopted in building code and fire code to overcome limitations of current bench-scale test method. Keywords : Fire performance evaluation, Room corner test, Gypsum board, Plywood

미생물 성장 특성에 기초한 독립영양탈질의 화학양론식 연구

이수원,김규동,최영균,김동한,정태학 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2

It is necessary to supply external carbon source for enhancement of biological nitrogen removal from domestic wastewater with low influent C/N ratio. Sulfide was chosen as a cost effective electron donor and reaction stoichiometry for autotrophic denitrification was investigated by conducting bench-scale experiments in this study. Higher sulfur to nitrogen (S/N) ratio than the calculated value from theoretical reaction stoichiometry was required when the anoxic reactor was operated at open condition because dissolved oxygen introduced by surface aeration reacted with sulfide with ease. In addition, higher sulfate production and lower yield of microorganism could be observed under the same condition. It was possible to obtain reliable reaction stoichiometry for autotrophic denitrification by establishing pure anoxic condition. Linear relationship between bacterial growth and consumption of nitrate, sulfide, alkalinity, and sulfate production enabled to derive a relatively correct reaction stoichiometry for autotrophic denitrification when sulfide was used as an electron donor.

요구르트가 여자대학생의 변비에 미치는 임상적 연구

이서래,김화영,최삼섭,승정자,오명숙,김동재 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-

In order to study the prevalence of constipation among female college students in Korea and the effect of yogurt, 3,243 students in Seoul area were surveyed by questionnaires for the status of stool evacuation and 197 students with possible constipation were sample and fed apple yogurt II from Pasteur Dairy Company for 3-weeks period. Students of constipation amounted to a high ratio of 53.4%, which consisted of 13.4% in heavy constipation(1-2 times evacuation per week)and 40.0% in mild constipation(3-4 times evacuation per week)during the past one-year period. To 90 of heavy constipation and 107 of mild constipation students were fed 290ml of yogurt every morning for 3-weeks period and examined for the status of stool evacuation by subsequent questionnaires. Frequency of stool evacuation was significantly improved in 51.3% of the students after 1 week, 57.9% after 2 weeks and 60.4% after 3 weeks(p<0.05). The effect of improvement in stool frequency was greater in heavy group than in mild group through the 3-weeks period. The number of students who experienced the disappearance of inconvenience in evacuation after drinking the yogurt was 52.3% after 1 week, 72.1% after 2 weeks and 76.1% after 3 weeks. Discomfort such as stomach disorder and mild diarrhea during the drinking period was observed in 24% students and it appeared that a longer drinking period was needed for adaptation of digestive tracts. The number of students maintaining the improved stool frequency was 38.7% after 1 week and 37.6% after 1 month since discontinuing yogurt drinking. The number of students reverted to the previous habit of evacuation after discontinuing was 51.6% after 1 week and 63.5% after 1 month, which were not significantly different between heavy and mild groups(p>0.05).

중공유리구에 고정화된 TiO_2 광촉매를 이용한 수중 조류(藻類)의 광합성억제

강민수,정익상,조인철,김성우,이동근 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-

TiO_2 was coated on the surface of the hollow pyrex glass beads through a sol-gel method. The TiO_2-coated hollow glass bead was employed as a photocatalyst to inactivate the algae under the illumination of UV light. TiO_2 could successfully be immobilized as a film on the surface of the glass bead. The TiO_2 film had anatase form and the average thickness of the film was estimated to be 0.3㎛. Two species of algae. Anabaena, and Microcystis were taken for the inactivation experiments. They are commonly found in algal blooms in eutrophic waters. When irradiated by UV light in the presence of the TiO_2-coated glass beads. Anabaena cells and Microcystis cells were lost their photosynthetic activity. Complete photocatalytic inactivation of Anabaena and Microcystis was obtained in about 30min.

농촌지역 오수처리시설의 성능평가 및 개선방안

박충환,박희동,이창균,임봉수 大田大學校 環境問題硏究所 2002 환경문제연구소 논문집 Vol.6 No.-

This study was carried out to evaluate performance of sewage treatment facility in rural area. Average effluent concentration was 7.6㎎/1 BOD. 10.3㎎/1 COD, 4.7㎎/1 SS, 19.140㎎/1 TN, and 1,631㎎/1 TP, within discharge quality standard. The removal efficiency rate of BOD, COD and SS was good as 89.8%. 78.5% and 90.1%, respectively. But that of TN, TP was very low as 25.0% and 31.4% respectvely. Average sewage flow rate was investigated by about 1.1㎥/d per household, 398ℓ pcd. In rainfall period, the removal efficiency rate of BOD. TN and TP was very low as 15%, 22% and 28%, respectively because of inflow and infiltration into sewer. In flowing concentration of sewage was diluted as rain is inserted into sewer and submerged facility was not operated at normal condition. Therefore it is required that the sewer will have to repair and hydraulic design for facility will have to be check. So it is necessary to support systematical, administrative measures for responsible management.