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        • KCI등재

          하구에 있어서의 밀도유적 수리조건

          이문옥,이삼노 한국해안해양공학회 1990 한국해안해양공학회 논문집 Vol.2 No.2

          밀도류에 대한 하구에서의 수리조건을 수리모형실험을 통하여 조사하였다. 정상염수쐐기가 존재하는 하구에서의 유하방향의 계면현상은 하구에서의 밀도 Froude수가 커짐에 따라 그 기울기가 증대하였다. 적층 두께는 하도내에서는 거의 일정하였으나, 하도내를 벗어나면서 급격히 증대하였으며, Overall Richardson number가 커짐에 따라 감소하였다. 하구에서의 밀도 Froude 수는 반드시 1.0은 아니며, 상층수량에 따라 변화를 나타내었다. 하구에서의 수위는 상대밀도차가 커짐에 따라 증가하는 경향을 보였다. 섬진강 하구에서의 현상관측결과, 하천수와 외양수와의 사이에 강한 밀도전선이 형성되어 있었다. Experimental studies oil the density currents were made in order to investigate their hydraulic conditions in the estuary. Interfacial forms in the flow direction became sharply with increasing densimetric Froude number in the estuary which arrested saline wedge exists. Interfacial thicknesses were almost constant in the open channel, while they abruptly increased out of channel and they also decreased as overall Richardson number increases. Densimetric Froude number of river mouth showed that it was not necessarily 1.0 and varies with the upper layer thickness. On the other hand, water level there tended to increase with increasing relative densities. It is observed in the Sumjin River Estuary that a strong density front has been formed between freshwater and ocean waters.

        • KCI등재

          하구에 있어서의 밀도유적 수리조건

          이문옥,이삼노 한국해안해양공학회 1990 한국해안해양공학회 논문집 Vol.2 No.1

          밀도류에 대한 하구에서의 수리조건을 수리모형실험을 통하여 조사하였다. 정상염수쐐기가 존재하는 하구에서의 유하방향의 계면현상은 하구에서의 밀도 Froude수가 커짐에 따라 그 기울기가 증대하였다. 적층 두께는 하도내에서는 거의 일정하였으나, 하도내를 벗어나면서 급격히 증대하였으며, Overall Richardson number가 커짐에 따라 감소하였다. 하구에서의 밀도 Froude 수는 반드시 1.0은 아니며, 상층수량에 따라 변화를 나타내었다. 하구에서의 수위는 상대밀도차가 커짐에 따라 증가하는 경향을 보였다. 섬진강 하구에서의 현상관측결과, 하천수와 외양수와의 사이에 강한 밀도전선이 형성되어 있었다. Experimental studies oil the density currents were made in order to investigate their hydraulic conditions in the estuary. Interfacial forms in the flow direction became sharply with increasing densimetric Froude number in the estuary which arrested saline wedge exists. Interfacial thicknesses were almost constant in the open channel, while they abruptly increased out of channel and they also decreased as overall Richardson number increases. Densimetric Froude number of river mouth showed that it was not necessarily 1.0 and varies with the upper layer thickness. On the other hand, water level there tended to increase with increasing relative densities. It is observed in the Sumjin River Estuary that a strong density front has been formed between freshwater and ocean waters.

        • 진해만 적조발생의 물리적 기구 I

          이문옥 전남대학교 수산과학연구소 1994 수산과학연구소논문집 Vol.3 No.-

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          The physical conditions of the red tide outbreak in Jinhae Bay were examined using currents, sea water temperature and sali띠ty measurement data during the summer. Masan Bay, Kohyun Bay and Wonmun Bay, in which the red tide have been frequently occurred fcπ the last decade, has kept g∞d physical condition for the increase of the red tide organisms. Therefore in these small inner bays the red tide could occur at anytime by the upwelling of oxygen deficient water masses due to a strong wind action. The red tide was more likely to occur in Masan Bay during the n않p tide than during the spring tide because the h아izontal dispersion coefficient at the n않p tide was less than the critical dispersion c∞fficient. Masan Bay and the western part of Jinhae Bay are believed to hold the possibility of the red tide occurring if only the north or east wind blows strongly. It is supported by the fact that when a strong north wind blew, the red tide was occuπed in Changsungpo Bay, and then the upwelling was observed by Kim(1994b) in the northern p따t of Jinhae Bay. 까le dimensionl않s quantity of 2h!Ri*ι (analogous to Wedderbum number) in Wonmun Bay was 0‘016, which was less than 12 of the critical value for the upwelling of oxygen deficient water masses by Yoon(1994).

        • KCI등재
        • KCI우수등재

          여자만 해양환경의 특징 -선행연구를 중심으로-

          이문옥,김종규,김병국 한국해양환경·에너지학회 2020 한국해양환경·에너지학회지 Vol.23 No.4

          We analyzed the marine environmental characteristics of Yeoja Bay, Korea, with comprehensive data of more than 80 articles and publications issued from 1983 to 2020 in relation to Suncheon and Yeoja bays. As a result, Studies of Yeoja Bay appeared to have been poorly conducted, compared to those of Jinhae and Gamak bays, and even Suncheon Bay. In addition, Yeoja Bay has not nearly experienced harmful algal blooms, oxygen-deficient water masses, and shellfish toxicities, although it is similar to Jinhae and Gamak bays in aspects of their physical environment. That was deduced because Suncheon bay plays a role as a buffer for purification of water quality as well as sediments. In a word, we can say marine environments of Yeoja Bay is dependent on how to well manage Suncheon Bay in a sustainable way. Therefore, we need to study Yeoja Bay in connection with Suncheon Bay in the future, although most of the previous studies have been independently conducted. With this, it is judged that we can elucidate a mechanism of Suncheon Bay not only to contribute to the marine environment of Yeoja Bay, in terms of salt marsh and inhabitants, but also to more explain the marine environmental characteristics of Yeoja Bay. 본 연구에서는 여자만의 해양환경연구와 관련하여 1983년부터 2020년까지 발표된 80여편의 학술논문과 기타 학위논문, 연구기관에서 발행된 조사 자료 등을 바탕으로 여자만 해양환경의 특성을 분석하였다. 그 결과, 여자만은 순천만은 물론 진해만이나 가막만 등 타 해역에 비해 연구 분야의 다양성이나 양적인 면에서 현저히 적었다. 또한 진해만이나 가막만 등과 서로 유사한 물리 환경적 조건임에도 불구하고, 적조는 물론, 빈산소수괴의 발생, 양식장에서의 패류 독성 등 특별한 환경문제가 거의 발생하지 않은 것으로 나타났다. 그것은 여자만의 북부에 위치한 순천만의 염습지와 서식생물이 여자만의 수질과 저질을 정화해 주는 완충장치와 같은 역할을 하고 있기 때문으로 판단되었다. 다시 말해, 여자만의 해양환경 문제는 바로 순천만을 얼마만큼 지속적으로 잘 관리하느냐에 달려 있다고 생각된다. 따라서 지금까지 여자만과 순천만 연구는 각각 서로 다른 관점에서 독자적으로 수행되어 왔으나, 앞으로는 여자만의 연구는 순천만과 연계하여 수행될 필요가 있다고 생각된다. 이를 통해 순천만의 염습지나 서식생물이 여자만의 해양환경에 기여하는 기작의 해명은 물론 여자만의 해양환경적 특성도 보다 더 명확해 질 것으로 판단된다.

        • KCI등재

          유아의 읽기 쓰기발달에 영향을 미치는 가정환경의 특성

          이문옥 한국유아교육학회 1994 유아교육연구 Vol.14 No.2

          The development of literacy occurs in a sociocultural context and, therefore, many researchers believe that what children do at home and in their natural environment is very important for early literacy deveiopment. Children's literacy development is greatly influenced by what they get from the environment, what they do with print, and how they interact with other people in literacy activities, as well as by their own maturation. Researchers have collected information on various characteristics of early environments that are related to young children's literacy development. The purpose of tnis study is to examine the relationships between home literacy environments and children's literacy development through literature review. The findings of the study are as follows: First, studies show that children's literacy development can benefit from being read to by their parents or by other literate per sons. Second, different social backgrounds can have different effects on children's literacy development. Studies show that children from middle-class families tend to read and write better than those from a lower socioeconomic background. However, some studies show children who are from a low socioeconomic background read and write well. Third, parents or other literate persons can play an important role in children's literacy development. Children see their parents or siblings reading and writing in various situations and for various purposes and come to realize that reading and writing are important and can be enjoyable. Fourth, many reading and writing materials which are readily available for them can stimulate their interest in learning to read and write. Fifth, how parents or others respond to children when they interact with their children can have significant effects on children's literacy development.

        • 교각건설로 인한 나로도 협수로 부근해역에서의 조류변화 수치모형실험

          이문옥 전남대학교 수산과학연구소 1993 수산과학연구소논문집 Vol.2 No.-

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          The field observation and numericaJ experiments with a two-dimensionaJ depthintegrated model have been undertaken in order to investigate some impacts on the flow structure resulting from the construction of a bridge connecting Kohung Peninsula and the Narodo Islands on the southem coast of Korea. TidaJ currents passing through the straits between the Narodo Islands showed that, aJthough the phase lagged one hour behind that passing through the strait between Kohung Peninsula and Naenarodo Island, it st피 kept strong flows of more than 8Ocm/sec near the bottom. The horizontal distributions of seawater temperature and salinity within the study area seemed to be higher southward but uniform vertically. The results of the drogue experiments in the straits between the Narodo Islands showed that the drogues moved northward of Sayangdo 피 the early part of the flood tide, but southward in the late part of the flood tide and finally stopped when they reached a mile from the east coast of Surakdo. On the other hand, the numerical computation showed that the flow structures after construction of bridge piers were basically in line with those before construction of bridge piers except for the slight variations of velocities in the vicinity of the bridge piers. A large scale clockwise circulation has been confumed in the south area of Namsungri of Kohung Peninsula from the computational results of tide-induced residual 야rrents. Referring to these computationaJ results, the impact category on the flow structures due to the bridge piers construction has been estimated to be within around 2km. 까le results were in good agreement with the field observations.

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