현행 중등학교 과학 실험 , 실습 교육 실태 조사 및 그 운영 진단 (Ⅱ) : 고등학교 과학 실험 , 실습 교육을 중심으로

김영호,이윤종,정원우,강용희,양승영,윤성효,안병호,윤일희,권용주,임성규,오철한,기우항,전명남,김중욱 한국과학교육학회 1998 한국과학교육학회지 Vol.18 No.3

본 연구는 96년도에 실시한 우리 나라 중학교 과학 실험·실습 교육의 실태 조사 연구에 따른 계속 연구의 일환으로 고등학교 과학 실험·실습 교육의 실태를 조사하기 위한 것이다. 연구내용은 고등학교 과학 교과서의 분석, 실험·실습 실시 현황 분석, 현행 실험·실습 교육의 문제점 분석, 현행 학교 구성원들의 실험·실습 교육 운영 실태 조사 및 현행 실험·실습 교육의 개선을 위한 연구과제 도출을 주요 연구내용으로 다루었다. 연구방법은 전국의 고등학교 80개교를 대상으로 이들 학교의 학생 1,977명, 교사 165명, 학교장 80명에게 적용하였다. 본 연구에서 밝혀진 결과를 중심으로 우리 나라 고등학교 과학 실험 실습 교육의 정상화를 위한 실험 내적인 연구과제를 제시하면 다음과 같다. (1)교재 개발에 대한 연구, (2)실험 킷트 개발에 대한 연구, (3)교사교육 및 재교육 프로그램 개발에 대한 연구, (4)교실 밖 실험·실습 활동 프로그램 개발에 대한 연구, (5)과학 실험·실습 소재의 개발에 대한 연구. This study was accomplished to analysis and survey on the experimental and practical science education of high school in korea for the consecutive study of the an analysis and survey on the experimental and practical science education of middle school in korea(Lee, Yoon-Jong et al., 1997). The status of facilities, management for the experiment, practices, teaching methods in high schools have been investigated. The present status and reasonable management of the high school science education have been grasped from the questionaires. To do this 165 high school science teachers, 1977 students and 80 principals of high schools in Korea are administered questionaires of Science Education Research Institute of Kyungpook National University(1997). The results of this study are as follows : The reasonable management for experiments and practices of science education were scanty in the high school around the urban and rural school owing to the shortage of facilities and equipments, crowded class, excessive class works for teacher, excessive contents of present textbooks and insufficiency of the administrative supports etc. The current teaching method of high school science has emphasized knowledge. This fact does not satisfy the objective of learning due to lack of the teaching method. Desirable directions for the improvement of present status of high school science education were proposed in this paper.

교사들의 공통과학 실험 · 실습 선호도 조사 분석

정원우,이윤종,강용희,윤일희,이우붕,손종경,김중욱,강동진,권용주 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

The purpose of this study is to investigate the status of the experimental and practical education in high school general science. The present status and reasonable management of the experimental and practical education in high school general science were evaluated by the questionaires. To do this, 146 science teachers in Korea are administered questionaires. The frequency of the experimental and practical items in the seven kind of general science text books were investigated. The problems and the reasonable management for experimental and practical education were proposed in this paper.

6K21-T4 알루미늄 합금 레이저 용접부의 기계적 성질에 미치는 필러 와이어의 영향

윤종원,강준일 동의대학교 산업기술개발연구소 2006 産業技術硏究誌 Vol.20 No.-

6xxx(Al-Mg-Si) alloy is candidate material for eco-friendly car (lightweight car body structure and panels) due to their good combination of strength and formability. 6K21 aluminum alloy sheet of 1㎜ and 2㎜ thickness were TB(tailored blank) welded using continuous wave Nd:YAG laser with and without 4043 filler wire. The effect of filler wire on the weldability of 6K21 alloy was investigated. The weld metal composition was changed by feeding the 4043 filler wire containing 5wt.% Si. Solidification cracking in the weld metal was substantially reduced when the filler wire was used. Tensile strength and formability of the welds were improved compared to those of welds made without filler wires. It was revealed by EPMA analysis and image mapping that the abundant amount of Al-Si eutectic existed particularly at the interdendritic sites or grain boundaries and thus the eutectic prevented the solidification cracking in the weld metal.

미세채널 구조물 상부의 초정밀 연마 기술 연구

강정일,이윤호,안병운,윤종학 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

Micro-Channel ultra-precision polishing is a new technology used in magnetic field-assisted polishing. In this paper, an electromagnet or the jig of test system was designed and manufactured. A size of magnetic abrasive is used on 25~75μm and for the polish a micro-channel upper part. A surface of channel which is not even is manufactured using magnetic abrasive finishing at upper surface of micro-channel. As a result, the surface roughness rose by 80% after upper surface of micro- channel was polished up 8 minutes by polishing.

韓國産 미꾸리에 關한 育種·繁殖學的 硏究 : Ⅵ. Histological Changes of Pituitary Gland and Oocytes from March to May Ⅵ. 계절에 따른 암컷의 腦下垂體와 卵母細胞의 組織學的 變化

姜京來,盧淳昌,尹鍾萬,朴弘陽,李相鎬 건국대학교 동물자원연구센터 1993 動物資源硏究誌 Vol.18 No.-

1992년 3월부터 1992년 5월까지 자연적인 채광상태에서 溫度를 유지시킨 후 채취된 미꾸리 암컷의 腦下垂體, 肝 및 卵巢 組織의 번식주기에 일어나는 미세구조의 변화를 광학 및 투과형 전자현미경을 이용하여 살펴보고, 이것들의 相互 聯關性을 알기 위하여 본 연구를 실시하였다. 본 연구에서 얻어진 결과는 다음과 같다. 성숙된 개체의 뇌하수체는 수많은 작은 분비과립과 커다란 분비구 및 불규칙한 형태의 과립들이 관찰되었다. 핵소체가 핵막 주변에 위치헤 있는 후기 단계(LMO)의 난모세포가 난황이 축적되는 성숙초기 단계(EMO)의 난모세포로 변형되는 시기를 난황의 형성이 개시되는 시기로 본다. 난모세포가 성장함에 따라 핵소체의 크기와 난황과립의 수가 증가하게 된다. 난황과립은 결정상의 과립으로 난세포질에 치밀하지 않은 상태로 축적된다. 성숙초기(EMO) 및 말기단계(LMO)에 난소는 커지고 투명하며 과립형태로서 색깔이 연노란색을 나타낸다. 따라서 난 내부를 쉽게 관찰할 수 있다. 방사대(ZR)는 성숙초기단계(EMO)에 단층으로부터 입방형태로 변화된다. 과립막 세포와 난모세포로 부터 유래된 미세융모는 난황형성이 진행되는 동안에 성장하게 되며, 방사대의 pore canals의 구멍을 통해서 서로 연결되어 있다. 따라서 외부로부터 물질의 이동이 있게 된다. 난모세포가 완전하게 성숙되어 방사대가 단단해 지면 미세융모는 그 기능이 상실된다. This study was undertaken to understand the development stages of pituitary gland, liver and ovary of Korean loach(Misgurnus anguillicaudatus) under natural circumstances from March to May 1922. Expecially, the light microscopic and ultrastructural changes of ooplasm and follicular membranes of oocytes, were observed by light and transmission electron microscope during the reproductive cycle. In pituitary gland of mature individuals, there were observed a number of secretory granules,large globules, and irregular masses.The vitellogenic phase began as these late perinucleolus oocytes became transformed into early maturing oocytes through the accumulation of yolk. The size of the nucleoli and number of the yolk granules increased as the oocyte growed. Yolk granules were loosely deposited in the oocyte as crystalline granules. Due to the presence of early and late maturing oocytes, their ovaries were enlarged transparent, granular and yellowish in color. Zona radiata change a squamous into cuboid shape in EMO stage. Microvilli from the granulosa cells and from the oocyte grow and make contact with each other in the pore canals of the zona radiata during vitellogenesis, but are withdrawn as the zona radiata becomes more compact during oocyte maturation.

말기신부전 환자에서 혈액투석 전후의 QT간격분산 비교

강대웅,정지용,윤나라,안치용,김종오,신병철,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Background: Some cases of QT interval, corrected QT interval (QTc), QT dispersion (QTd) and corrected QT dispersion (QTcd) have been reported in ESRD, but these results are variable and the influence of a hemodialysis is still controversial, In this study, we investigated the effect of hemodialysis on QT and QTc interval and QT and QTc dispersion in patients with ESRD 15 min before and 15 minute after each hemodialysis. Methods: Sixty-seven patients with ESRD (men 33 & women 34) on three-times stable hemodialysis (>3 months) were randomly enrolled. Fifty control subjects with a similar age and normal renal function were enrolled from this hospital. Routine biochemical studies were measured pre- and post dialysis, at the time of the ECG. Plasma Na+, K+, BUN, creatinine, ionized calcium and phosphate were checked. Twelve-lead electrocardiographs were performed at 10㎜/mv and 50㎜/s using a HewIett-Packard Pagewriter 100, before and after a single hemodialysis session.The QT interval was measured from the onset of the QRS complex to the end of the T wave. If the end of the T wave was not clear in a particular lead then it was excluded from analysis. When U waves were present, the end of the T wave was taken as the nadir between the T and U waves. Each QT interval was corrected for heart rate using Bazett's formula (QTc==QT/√(RR)) (ms). The difference between maximal and minimal QT interval duration was defined as QT dispersion (QTd) in each of the 12 leads. Result: This study demonstrates that QT, QTd, QTcd is higher in hemodialysis patients compared with control subjects, and QT and QTd rise postdialysis to levels comparable to those seen acutely following myocardial infarction, when patients are at greatly increased risk of potentially fatal ventricular arrhythmias, Conclusions: QT interval and QT dispersion, markers of risk for arrhythmias and sudden death, are elevated in hemodialysis patients, and rise postdialysis. QT interval and QT dispersion is an easily obtainable, noninvasive, simple, inexpensive, and widely available method of risk stratification in uremic patients receiving chronic dialysis. Additional studies are needed to clarity whether increased postdialysis QT dispersion results in an increased occurrence of arrhythmias.

떫은감 Carotenoid의 색소 안정성

강미정,윤경영,성종환,이광희,김광수 동아시아식생활학회 2004 동아시아식생활학회지 Vol.14 No.4

Studies on extraction and color stability of carotenoids from astringent persimmon(Diospyros kaki) were performed to provide the basic information for the utilization of persimmon pigment as a new source of natural food colorant. The major carotenoids in astringent persimmon were beta-cryptoxanthin, lycopene and beta-carotene. Beta-cryptoxanthin was the first major pigment and lycopene the next. Total carotenoid content in persimmon calculated as beta-carotene equivalent was 107.4 ㎍/g. The data indicated that the astringent persimmon was a good source of carotenoid pigment. The physical and chemical stabilities of carotenoid from astringent persimmon were investigated at various conditions of temperature, pH and antioxidant. The effects of oxygen and light on the stability of carotenoid pigment has been investigated. The factors that cause the discoloration were visible light, temperature above 60, pH below 5 and oxygen. Especially, the carotenoid pigment was very sensitive to light and oxygen. Carotenoid stability was much improved with increasing nitrogen concentration in the atmosphere. Persimmon pigments have been found to be most stable at 5~10. And tocopherol was the most effective inhibitor of the pigment discoloration.

다수의 냉동시스템에 의한 저온 저장고의 에너지 성능평가

강동언,김성만,운종호,이의준,박영하,현명택 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

The cool storage system(CSS) is a specific building that is required only cooling load without heating during the whole year. CSS uses a electric energy which is very expensive and is required much amount of energy due to temperature differences between interior and ambient temperatures. The purpose of this study is to assess the energy performance of the multi-unit cooler operating control system. For the prediction of its performance, two types of test (KIER). First cell is equiped with one .are installed a t Korea Institute of Energy Research large unit cooler. and second cell consists of two small unit coolers. According to the results of experiments using these cells. the multi-unit cooler operating control system is found to be effective in energy saving and beneficial for storage due to much less deviation of temperature.

다수의 냉동시스템에 의한 저온 저장고의 에너지 성능평가

김성만,윤종호,박영하,이의준,강동언,현명택 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

The cool storage system(CSS) is a specific building that is required only cooling load without heating during the whole year. CSS uses a electric energy which is very expensive and is required much amount of energy due to temperature differences between interior and ambient temperatures. The purpose of this study is to assess the energy performance of the multi-unit cooler operating control system. For the prediction of its performance, two types of test cell are installed at Korea Institute of Energy Research (KIER). First cell is equiped with one large unit cooler, and second cell consists of two small unit coolers. According to the results of experiments using these cells, the multi-unit cooler operating control system is found to be effective in energy saving and beneficial for storage due to much less deviation of temperature.

인도메타신의 투여가 치아 맹출 시 기질금속단백분해 효소의 분포에 미치는 영향

강윤구,남종현,이기수 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.2

이 연구는 치낭과 그 주위 조직 세포에서 matrix metalloproteinase (MMP)-3과 -9의 발현에 대한 인도메타신의 영향을 관찰하여 인도메타신이 치아의 맹출에 미치는 영향의 일단을 규명하기 위해 시행되었다. 생후 10-12주된 10마리의 개를 실험군 8마리와 대조군 2마리로 나누고 실험군은 인도메타신을 체중에 대하여 통상적 복용량인 인도메타신 2㎎/㎏/day을 7일간 및 14일간 투여한 군과 과량의 8㎎/㎏/day을 7일간 및 14일간 투여한 군으로 나누고 대조군은 빈 캅셀을 placebo로 투여한 후 희생하고 맹출 중인 영구치 치배를 적출하여 조직 처리하고 H-E 염색 및 MMP-3과 -9에 대한 면역염색 시행 후 광학현미경으로 검경하였다. 관찰결과 대조군에서는 파골세포, 조골세포, 치주인대 세포, 법랑모세포 및 상아모세포에서 모두 MMP-3과 -9의 발현이 뚜렷하게 관찰되었다. 대조군에 비해 인도메타신 투여군에서 파골세포, 조골세포, 치주인대 세포는 MMP-3과 -9의 발현이 억제된 소견이 관찰되었으며 인도메타신의 투여기간이 길수록 투여량이 많을수록 더 뚜렷하게 관찰되었다. 법랑모세포와 상아모세포는 대조군과 실험군의 MMP-3과 -9의 발현의 차이가 관찰되지 않았다. 이상의 결과에 의하면 prostaglandin (PG) 생합성 억제제인 인도메타신은 치낭의 파골세포, 조골세포 및 치주인대 세포에서 MMP-3과 -9의 발현을 억제하였으며 이는 인도메타신 투여로 치아 맹출이 억제될 수 있음을 시사한다. Tooth eruption requires remodeling of surrounding tissues. This study was aimed to investigate the effect of indomethacin on the dental follicle and paradental tissues during tooth eruption by observing the distribution and expression of MMP by the immunohistochemical method. Ten mongrel dogs of ten to twelve weeks old were divided into 5 groups: four experimental groups administered indomethacin 2㎎/㎏/day 8㎎/㎏/day and orally 2 times a day for 14 days and 7 days respectively, and the control group was administered a placebo. Permanent teeth before eruption and their surrounding tissues were selected and excised. H & E staining and immunohistochemical stainings of MMP-3 and -9 were performed and examined under the light microscope. Osteoclasts, osteoblasts, periodontal ligament cells, ameloblasts and odontoblasts of the control group all expressed MMP-3 and -9. In the experimental group, osteoclasts, osteoblasts and periodontal ligament cells showed reduced expression of MMP-3 and -9. Magnitude of MMP reduction in the experimental group showed a time and dose of indomethacin administration dependent manner. These results show that indomethacin inhibited MMP-3 and -9 expression in the dental follicle and surrounding tissues and suggest that when indomethacin is administered for long periods, tooth eruption could be delayed.