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        검색결과 2,487

        1721.
        1996.01 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study aims to investigate theoretically and experimentally second-order water level variation. The simple method obtaining second-order water surface elevation and mean water level applicable to both progressive and diffraction wave, mean water level set-down, as well as set-up occurs and it is shown to be in good agreement with the experimental results.
        4,000원
        1722.
        1996.01 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        TiO2/Ag 계 적층형 투명 열절연 박막의 최적 제작조건 설정을 위한 기초 연구로써, 스퍼터조건에 따른 결정구조 및 광학특성 변화거동을 관찰하였다. 반응성 스퍼터링에 의한 TiO2박막 제작조건에 따른 결정구조 및 광학특성 변화거동을 관찰하였다. 반응성 스퍼터링에 의한 TiO2 박막 제작시 Po2/PAr≤0.2에서는 α-TiO2 의 결정구조였으나, Po2/PAr≤0.2에서는 기판 온도(RT-370˚C) 및 열처리 온도(100-800˚C)에 관계없이 non-stoichiometric 화합물로 판명되어, 산소 분압비가 TiO2 의 조성제어에 가장 중요한 변수로 나타났다. TiO2 박막은 열처리 온도의 증가(100-800˚C)에 따라 굴절률이 증가(2.19-2.37)하는 경향이었는데, 이는 박막의 밀도증가에서 기인하는 것으로 판단된다. Ag 박막은(111)면과 (200)면이 우세한 결정립으로, 기판 온도(RT-370˚C) 및 열처리(100-800˚C)에 따라 등축상의 결정립 성장을 관찰할 수 있었다.
        4,000원
        1725.
        1995.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study was performed to investigate the nutritional knowledge and dietary patterns of 450 high school girls in some areas of Seoul. The survey conducted from September 20 to 25, 1993. The results obtained were summarized as follows ; The average height and weight of the subjects were 160.2±5.0cm and 52.3±6.7kg respectively. The average obesity index of the subjects was 96.8±11.7%. Menarche was at 13 years of age in 35.6% of the subjects and at after 14 years of age in 37.3% of them. The average score of nutritional knowledge was 60.04±14.49 and the average score of perceived nutritional knowledge was 83.9±14.44. The mean score of nutritional knowledge was 49.61±13.45. 35.6% of subjects ranked lecture of score as their primary sources of nutritional information. Major dietary problems of subjects were eating rapidly, skipping breakfast, unbalanced diet and choice of snacks according taste. Underweight group showed significantly higher than other groups in unbalanced diet(P<0.01) and showed significantly higher than other groups in taking a medicine(P<0.001). Obese group showed significantly lower than other groups in remaining meals and unbalanced diet(P<0.05) and showed significantly higher than other groups in voereating.
        4,500원
        1727.
        1995.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        서울, 충청도 및 강원도 지역의 김장김치 담금방법을 알고자 203개 가정에서 설문조사를 한 결과 3지역에서 김장김치류중 배추김치는 95%이상 남았는데 배추선택시 결구도를 가장 중요시 하였다. 배추는 천일염을 주로 사용하여(66∼78%)소금물에 적신 후 다시 소금을 뿌려 약 7∼10시간 동안 절였다. 김치숙성시 서울과 충청도는 배추상태가, 강원도는 양념이 가장 큰 영향을 미치는 것으로 인식되었으며 김치보관은 70%이상이 김치 항아리를 이용하였는데 김치보관용기와 주거형태(단독 및 아파트)간에는 x^2=49.87(P<0.000)로 유의적인 관계가 있는 것으로 밝혀졌다.
        3,000원
        1728.
        1995.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The purpose of this study was to investigate the effectiveness of mental practice in increasing accuracy of performance during motor task. Forty healthy students aged 17 years were randomly assigned to two groups. The experimental group(n=20) performed mental practice; the control group(n=20) performed nothing. The task was dotting. No significant change was seen between pre and post test subtest results following mental practice sessions(p>0.05). The experimental group's accuracy improved a little but this was not valuable statistically(p>0.05). We could not prove that mental practice was effective in increasing accuracy of motor task performance.
        4,000원
        1731.
        1995.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        북한산 국립공원 우이령계곡, 하루재계곡, 구기계곡, 송추계곡 도봉산계곡의 식물군집구조분석을 위하여 각 지역에 38, 40, 26, 28, 36개씩의 조사구(조사구면적 100m2)를 설치하고 식생조사를 실시하였으며, 조사된 자료를 종합하여 TWINSPAN에 의한classification과 DCA에 의한 ordination기법을 적용하였다. 전체 조사구는 TWINBPAN에 의하여 서어나무군집 (I), 신갈나무군집 (II), 소나무군집 (III), 신갈나무-소나무군집(IV), 신갈나무-졸참나무-산벚나무군집 (V), 신갈나무-굴참나무군집 (Ⅵ), 아까시나무-상수리나무군집 (Ⅶ), 리기다소나무-졸참나무군집(Ⅷ), 신갈나무-굴참나무-쪽동백나무군집(Ⅸ) 등 9개의 군집으로 분리되었다. 본 조사지의 천이계열은 자연림의 교목층에서는 소나무→신갈나무, 인공림에서는 아까시나무, 리기다소나무→상수리나무, 물푸레나무 순이었으며, 아교목층과 관목층에서는 바위말발도리, 개옻나무, 산철쭉, 참회나무→당단풍, 함박꽃나무, 생강나무 순이었다. 기왕의 연구와 비교하여 인간의 간섭과 대기오염으로 인한 토양산성화 등으로 인해 천이가 진행되지 못하는 것으로 추측되었다.
        4,800원
        1732.
        1995.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        대산공단과 군산공단의 대기오염에 의한 삼림피해현상을 연구하기 위하여 조사구를 각각 5개, 3개씩 설치하였다(1개 조사구 당 면적 500m2). 대산공단 삼림의 교목층 아교목층의 우점종은 소나무와 곰솔이었고 관목층에서는 진달래와 참나무류가 우점종이었다. 종다양도는 0.4859~0.9202 이었으며, 조사구간의 차이가 심하게 나타났다. 토양 pH는 4.67~5.12로 약산성이었다. 대산공단지역에서는 아직 대기오염에 의한 삼림의 피해가 심각하지 않은 것으로 나타났다. 군산공단삼림의 교목층 및 아교목층의 우점종은 곰솔과 소나무이었다. 종다양도는 0.8115~l.0983이었고 오염원과 가까운 조사구가 가장 낮게 나타났다. 토양 pH는 4.32~4.76으로 강산성이었다. 군산공단의 오염원 인근삼림은 울산공단과 유사한 피해양상으로 심각한 피해를 받고 있었다.
        4,600원
        1735.
        1995.05 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The purposes of this study were to produce cloned rabbit embryos and offsprings by nuclear transplantation(NT) using in vitro matured oocytes as nuclear recipient cytoplasm and to determine the effect of frozen nuclei donor embryos on the production efficiency of cloned embryos. The 8cell embryos were collected from the mated does by flushing oviducts with Dulbecco's phosphate buffered saline containing 10% fetal calf serum(FCS) at 40 hours after hGG injection. A portion of collected embryos were preserved at 4 for 24 hours and a portion of them were frozen by vitrification method. The embryos used for donor nuclei were synchronized in the phase of Gi /S transition. The in vitro matured oocytes were used as recipient cytoplasm following removing the nucleus and the first polar body. The synchronized blastomeres from fresh, cooled or frozen embryos were injected into the enucleated oocytes by micromanipulation and were electrofused by electrical stimulation of three pulses for 60 sec at 1.0 W /cm in 0.28 M mannitol solution. The fused oocytes were co-cultured with a monolayer of rabbit oviductal epithelial cells in M-199 solution containing 10% FCS for 120 hours at 39 in a 5% incubator. Following in vitro culture of the NT embryos to blastocyst stage, they were stained with Hoechst 33342 dye for counting the number of blastomeres by fluorescence microscopy. The nuclear transplant embryos developed in vitro to 2- to 4-cell stage were transferred into the oviducts of synchronized recipient does. The results obtained were summarized as follows: 1. The fusion rates of the blastomeres from fresh, cooled and frozen embryos with the in vitro matured and enucleated oocytes were 100, 95.8 and 64, 3%, respectively. 2. Development in vitro to blastocyst was significantly(p<0.05) different between the cloned embryos with the blastomeres from fresh, cooled or frozen embryos as 39.0, 20. 9 and 15.7%, respectively. 3. The mean numbers of cell cycle per day during in vitro culture of cloned embryos blastomeres from fresh, cooled or frozen embryos was 1.31, 1.29 and 1.16, respectively. 4. A total of 77 nuclear transplant embryos were transferred into 6 recipient does, of which two offsprings were produced from a foster mother 31 days after embryo transfer.
        4,000원
        1736.
        1995.05 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In order to determine the optimum condition and timing for in vitro maturation of oocytes to metaphase of meiosis II (M II), the immatured follicular oocytes were recovered by puncturing the large(1.0~1.5 mm in diameter) and small(<1.0 mm in diameter) follicles in the ovaries of rabbits treated intramuscularly with a single dose of 100 TU PMSG 68 hours previously. The follicular oocytes were classified into three grades by the attachment of cumulus cells. The Grade I and II follicular oocytes from large follicles were cultured in BO-DM medium with 10% FCS, 35 g /nl of FSH, 10 g /ml of LH and 1 g /ml of estradiol-17 at 39t in a 5% incubator for 11 to 23 hours. In 3 hours interval during the culture period, the oocytes were harvested and their cumulus cells were removed with hyaluronidase. The denuded oocytes were stained with Hoechst 33342 dye and their meiotic status and extrusion of the first polar body (PB) were examined under a fluorescence microscope. Also the fragmentation of the first PB and the distance between the first PB and nucleus were examined. The results obtained were as follows: 1. The mean recovery rate of follicular oocytes from the large and small follicles was 59. 9 and 31.3%, respectively. The mean number of oocytes recovered per rabbit and the Grade I percentage were 14.6 and 94.4% in large follicles, but 2.1 and 61.1% in small follicles, respectively. All the parameters examined were different significantly (p<0.05) between both the folliclular size. 2. Most of the follicular oocytes(86.8%) were matured in vitro to M II phase in 14 hours in Grade I oocytes, but the significantly(p<0.05) less oocytes(45.5%) were matured in Grade II oocytes. 3. The first PB was extruded in most of the oocytes(94.7%) in 14 hours of culture with the fragmentation rate of 29.6%, but the fragmentation rate of the first PB increased significantly (p<0.05) as the culture period for maturation was longer to 20 hours(63.5%). 4. The distance between the first PB and nucleus was increased linearly (p<0.05) as the maturation time passed from 14(7.1rn) to 23 hours(58.4m). 5. From the above results it was concluded that the optimum time for in vitro maturation culture might be 14 hours in the follicular oocytes from rabbit primed with PMSG for 68 hours, expecially when these follicular oocytes were used for recipient cytoplasms in embryo cloning.
        4,000원
        1737.
        1995.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The variation of the urban water demand and the amount of water in the distribution reservoir was studied with time for a day. The city of Kwangju in Korea was selected as a study area. The population of Kwangju in the end of 1993 was more than one million and two hundred thousand peoples. The average of daily water use in 1993 was about three hundred and fifty thousand tons a day. One day was devided into 12 divisions with a 2 hour increment. The water use demand related to the amount of water in the distribution reservoir was observed for the given time interval of a day. The water use index was defind in percentage that indicates the ratio of the amount of water use for a time interval to the amount of water use for a day. The water use index with consideration of the water stored in the reservoir was found to be useful to manage and to operate the water supply systems in real time.
        4,000원
        1739.
        1995.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 연구는 주왕산국립공원내 주왕계곡의 식물군집구조를 밝히기 위하여 30개소에 조사구(1개 조사구당 100m2)를 설치하여 식생조사를 실시하였으며 군집구조분석에는 상대우점치, 흉고직경급 분포, 종다양도지수, DCA, CCA 및 TWINSPAN분석을 적용하였다. 30개 조사구의 우점수종은 소나무, 졸참나무, 신갈나무, 굴참나무이었으며 전체 조사구는 TWINSPAN에 의해 신갈나무-소나무-서어나무군집, 소나무-굴참나무군집, 졸참나무-굴참나무군집, 활엽수혼효림의 4개군집으로 분리되었다. 본 조사지의 종다양도는 1.17~l.32로 높게 나타났다. 천이계열은 교목상층에서 소나무→참나무류로의 천이가 진행될 것으로 예측되었다.
        4,600원
        1740.
        1995.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        주왕산국립공원 이전동 절터지역을 중심으로 삼림군집구조 분석을 실시하기 위해 24개소에 조사구(각 l0×10m)를 설치하고 식생조사를 실시하여 TWINSPAN과 ordination기법의 일종인 DCA를 적용하여 분석하였다. 전체 24개 조사구는 DCA에 의해 졸참나무-굴참나무군집 졸참나무-소나무군집, 신갈나무-생강나무군집, 까치 박달-당단풍군집, 그리고 고로쇠나무군집의 5개 군집으로 분리되었다. 삼림군집구조분석결과 추정되는 천이계열은 교목충에서 소나무→졸참나무, 굴참나무, 신갈나무→까치박달, 서어나무, 고로쇠나무로, 아교목층에서는 진달래, 철쭉→당단풍, 생강나무 순으로 예측되었다. 그러나 일부지역에서는 신갈나무가 토지극상으로 발전될 가능성을 보였다.
        4,600원