• Journal of Conservation Science
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• v.8 no.1 s.11
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• pp.1-9
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• 1999

The present aspect of the Seoggulam is the result of natural weathering of the rocks and influences by mankind. The rocks constituting the Seoggulam is granodiorite of medium and coarse grains which show brown to dark brown weathered surface resulted mainly from chemical weathering of feldspars. It also shows partly milky white or black colors due to influences by weathering products of cement used in the concrete dome and cracks. There are cracks and crack zones with very small cracks which may be formed by strong weathering and influences of shocks during operations of reconstitution and repair. However, for the better conservation, it must be considered to maintain the balances of temperature and moisture, especially relative moisture in places within the room, structural stability, and the influences of vibration made up by some reasons.

• Journal of the Korean Data and Information Science Society
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• v.27 no.3
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• pp.711-724
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• 2016

Under variable complex operating environment, various factors can affect the lifetimes of systems. In this research, we study bivariate reliability models having multiple dynamic competing risks. As competing risks, in addition to the natural failure, we consider the increased stress caused by the failure of one component, external shocks, and the level of stress of the working environment at the same time. Considering two reliability models which take into account all of these competing risks, we derive bivariate life distributions. Furthermore, we compare these two models and also compare the distributions of maximum and minimum statistics in the two models.

• Korean Journal of Ecology and Environment
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• v.49 no.1
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• pp.1-10
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• 2016

The increases of industrial and technological development and human activities have disturbed the balance of natural nitrogen (N) circulation. These phenomena have induced that large amounts of N are to be present in excess in air, soil and water environment. We investigated the effects of excess of reactive nitrogen ($N_r$) compounds on soil and water environment ecosystems through literature and case studies, and suggested the strategy of mitigating the acidification in soil and water ecosystems. $N_r$ moves to air, soil and water media, can be converted to different types, and interacts with other chemical compounds. As an efficient N management plan, the evaluation (application of monitoring and safety index) and the chemical restoration (research and development) of the acidification in soil and water environment ecosystems are required to minimize the effects of $N_r$ as well as policies to regulate the various emission sources and amounts of $N_r$.

• Korean Journal of Ichthyology
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• v.26 no.4
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• pp.322-330
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• 2014

The fish species and groups were investigated at the four streams in Goseong from September 2011 to August 2012. During the survey period, 17 species from Goseong stream, 18 species from Maam stream, 20 species from Guman stream, and 15 species from Baedun stream of fish were collected. Four creek downstreams were classified into 2 groups which were categorized by the effects of seawater. Group A is Guman and Maam streams with no estuary barrage, with the exchange of freshwater and seawater. On the other hand, group B is Goseong and Beadun streams which was blocked by the estuary barrage and submerged weir. The former group was mainly consisted of peripheral freshwater fish species such as Tridentiger brevispinis, Gymnogobius castaneus, Mugli cephalus, and Acanthogobius flavimanus. The latter one was composed of primary freshwater fish species such as Zacco koreanus, Squalidus gracilis majimae, and Pseudorasbora parva. These results suggest that estuary barrage and submerged weir in the stream could change the natural flow of seawater and freshwater, resulting in change of fish species and groups.

• Korean Journal of Environment and Ecology
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• v.22 no.2
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• pp.128-137
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• 2008

The purpose of this study is to analyze the effect of hiking trails on forest landscape's fragmentation, based on which also to assess the landscape-ecology-based integrity by small drainage area by selecting Bukhansan National Park as a survey target. The results of effect analysis are as follow; size of forest patch decreased; the density of patch and edge increased; patch shape became complicated; the dimensions of core area noticeably decreased and proximity degree between patch increased after trail-building. In addotion, the assessment results of overall landscape ecology-based integrity by small drainage basin showed that the Bukhansan catchment area was highest making 3.7 point, while Gugi catchment area was rated the lowest making 1.6 point. Putting the above results together, it is necessary to prohibit the opening up of unnecessary trails and to make room for ecological restoration of damaged and disturbance area to their original state as nature goes for landscape-ecology-based conservation and management of forests.

• The Journal of Engineering Geology
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• v.33 no.3
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• pp.489-502
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• 2023

Urban floods pose significant challenges to cities worldwide, driven by the interplay between urbanization and climate change. This review examines recent studies of urban floods to understand their causes, impacts, and potential mitigation strategies. Urbanization, with its increase in impermeable surfaces and altered drainage patterns, disrupts natural water flow, exacerbating surface runoff during intense rainfall events. The impacts of urban floods are far-reaching, affecting lives, infrastructure, the economy, and the environment. Loss of life, property damage, disruptions to critical services, and environmental consequences underscore the urgency of effective urban flood management. To mitigate urban floods, integrated flood management strategies are crucial. Sustainable urban planning, green infrastructure, and improved drainage systems play pivotal roles in reducing flood vulnerabilities. Early warning systems, emergency response planning, and community engagement are essential components of flood preparedness and resilience. Looking to the future, climate change projections indicate increased flood risks, necessitating resilience and adaptation measures. Advances in research, data collection, and modeling techniques will enable more accurate flood predictions, thus guiding decision-making. In conclusion, urban flooding demands urgent attention and comprehensive strategies to protect lives, infrastructure, and the economy.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.12 no.1
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• pp.43-49
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• 2007

The methods of physical oceanographic surveys to examine the effect of thermal discharge from nuclear power plants in Korea have been reviewed and a standard guide to the survey is proposed. It is desirable that in situ observation and numerical thermal diffusion modeling are conducted simultaneously to describe the variation in temperature distribution affected by thermal discharge from a power plant because any observation or numerical modeling alone has limits to do so quantitatively. It is suggested that the field observation must be based on the concept of heat budget modeling considering all artificial and natural heat sources/sinks around the power plant. Any results from numerical modeling must reach to a certain statistical significance level to use for a standard temperature distribution. In addition, the development of standard numerical codes is proposed to improve the problems shown in the past numerical circulation and diffusion modelling.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.10
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• pp.4047-4054
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• 2010

We studied the release characteristics of the marine sediment which could facilitate sea eutrophication through some lab-scale simulation experiments. Environmental indicators such as pH, ORP(oxidation reduction potential), nitrogens, and phosphates were measured in order to calculate the corresponding release rates. $CaO_2$, an oxygen releasing compound was used to determine how it would effect on the natural process of sedimental release. COD, ammonia nitrogen, phosphorous compounds were less released under the oxic environment caused by $CaO_2$. This basic data will help developing methodology for reducing marine eutrophication which may be initiated by the sedimental release.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1310-1314
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• 2008

수도권 지역의 신도시 개발에 따른 유역의 도시화와 인구 증가는 유역의 피복상태를 변화시키고, 생태계에 영향을 미치는 수문학적 과정과 하천수질의 변화를 초래하게 된다. 지표면의 침투, 침루 및 토양함수량을 변화시키고, 차단저류량과 요지저류량(depression storage) 등을 변화시킴으로서 유출량과 수질을 변화시키게 되는 것이다. 이와 같은 수문학적과정을 평가하기 위해서는 수문모형을 사용하는데 본 연구에서는 미국 농림부에서 개발한 SWAT모형을 이용하였다. SWAT-K모형은 SWAT(Soil and Water Assessment Tool) 모형에 인위적, 자연적인 물순환 구조변화와 지표수-지하수 연계 해석 등을 개선하여, 강우 증발산 토양수분 지표수 지하수 등의 시, 공간적 분포를 정량적으로 산정하는 장기유출 해석 모형이다. 또한, 본 모형의 적용을 위하여 GIS를 이용한 공간정보를 처리하여 수문모형의 매개변수를 결정하는 방법이 널리 사용되고 있는데, 본 연구에서는 ArcView GIS를 이용하여 입력자료를 구축하였다. 대상유역은 판교유역으로서 신도시 개발이 한창 진행되고 있는 지역으로서, 개발 과정에 따라 수문특성, 유출특성, 수질변화 특성 등이 계속하여 변화되고 있으며, 개발이 완전히 종료된 이후의 특성을 예측할 필요가 있는 유역이다. 본 연구에서는 SWAT-K모형을 이용하여 판교 신도시 개발에 따른 장기유출량을 예측하였고 모델의 매개변수를 최적화하였으며, 그 결과 본 모델이 장기 유출량 해석 및 판교유역의 수문변화를 평가하는데 유용하게 적용될 수 있을 것으로 판단되었다.

• Korean Journal of Child Studies
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• v.3
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• pp.17-33
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• 1982

본 연구는 아동의 탐색활동에 관한 연구에 지침이 되고 자극을 주고자, 또한 실제 지도에 있어 시사점을 발견하고자 이 분야에 관한 주요연구문헌을 고찰하였다. 그리하여 탐색활동을 놀이와 호기심과 비교하여 그 정의를 내리고 탐색활동의 기능과 특징, 그리고 이 활동에 영향을 주는 제 요인을 살펴보았다. 그 결과 아동의 탐색활동에 관한 연구자간의 의견차이를 보이는 것이나 연구공백이 있는 것이 여러부분이 됨이 드러났다. 즉 놀이와 탐색활동과의 구별, 탐색활동과 호기심과의 관계, 탐색활동의 동기, 상황에 따른 탐색활동의 유형변화, 탐색활동을 유발시키는 자극물의 특성-특히 공간적 특성, 탐색활동과 아동의 년령, 성별, 인지적 발달단계와의 관계, 그리고 탐색활동에 있어서의 개인차 등에 관해 더 많은 연구가 요구됨을 알 수 있었다. 특히, 아동의 탐색활동과 지적발달 또는 사회성 발달과의 관계나 아동의 발달과정에 따른 훈련이나 교육을 동한 탐색활동의 증진방안 등은 시사성 있는 중요한 연구테마로 보여진다. 또한 이 탐색활동에 관한 연구에서도 실험실에서 이루어진 연구가 자연적인 상황에 얼마나 일반화 될 수 있는지, 한 번의 관찰이나 실험이 계속적인 의미를 지닐 수 있는지에 대해 연구자들이 더욱 신중해야 할 필요성이 있음이 드러났다. 물론, 한 가지 이론이나 연구로서 탐색활동의 전부를 설명할 수는 없다. 유아교육자들이나 아동학자들은 아동이 그 자신의 환경에 적응하고, 사회적 유능성을 함양시키고, 진정한 의미에서의 지능발달에 중요한 것으로 드러난 이 아동의 탐색활동에 관해 더욱 관심을 가지고 여러 가지 이론과 연구를 빌어 연구나 실제 지도에 필요한 아이디어를 삼아야 할 것이다.