• 항공우주정책ㆍ법학회지
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• 제26권2호
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• pp.239-258
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• 2011

Space debris mitigation has become an international custom for international space activities. IADC and COPUOS adopted a Guideline on Space Debris Mitigation. Two Guidelines provided that member states or international organization shall establish a national mechanism to mitigate space debris. China has made progress in legislation on space debris mitigation and management system. It establised a fundamental framework on the legislative mechanism on space debris mitigation and managemental mechanism on space debris mitigation. In order to further improve the national mechanism on space debris mitigation, it is essential for China to strenghen legislation on space activities and specify the duties of management administrates.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.302-311
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• 2008

There have been repetitive landslides and debris flows on natural terrain induced by intensive rainfalls which have never been experienced during the last a few decades in Korea. Frequencies and magnitudes of landslides and debris flows are steeply increased after 2000 resulting in huge damages of human beings and facilities. According to a statistical data from NEMA, the human deaths induced by landslides and slope hazards occupies 22.3% of the total human deaths by all the natural hazards in Korea during the last 30 years. Among the human deaths by landslides and slope hazards, 85% of the damages were caused by landslides and debris flows on natural hazards. Therefore, this paper summarizes important events of landslides and debris flows, their characteristics, and suggests some methods of damage mitigation.

• 해양환경안전학회지
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• 제27권3호
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• pp.439-446
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• 2021

Environmental damage caused by marine plastic debris occurs and has become a major contributor to marine pollution. This study analyzed the current state of marine plastic debris pollution and proposed essential strategies to reduce damage. To assess the current state of pollution arising from marine plastic debris, this study investigated the properties of plastic debris, reviewed case studies of ecological impacts, and examined the inflow and distribution of marine plastic debris. The results of this study indicate that the major deleterious effects of marine plastics are entanglement and ingestion. In addition, the amount of plastic waste entering the sea was estimated to be 230 Mt in 2015 and may increase to 554 Mt in 2050. In this study, three key strategies were proposed to reduce damage and preserve the ecosystem, including: 1) removing plastic debris in the marine environment, 2) limiting the release of plastic debris to the marine environment, and 3) preventing damage to humans and marine life from plastic debris. To minimize the environmental damage caused by marine plastic debris, the proposed response strategies should be implemented in parallel.

• 한국방재학회 논문집
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• 제10권1호
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• pp.49-55
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• 2010

본 연구에서는 토석류를 비압축성의 불안정한 유체로 가정하여 토석류의 피해범위를 시뮬레이션하는 GIS 기반의 프로그램의 개발에 대해 다루고 있다. 개발된 Debris Flow Analyzer 프로그램은 입력된 DEM을 완만하게 재정리한 후, 대상지역에 대한 경사, 토석류 이동 방향, 계곡을 추출한 결과와 토석 부피, 물 부피, 속도, 유효 점도, 동적 마찰계수를 취합하여 유한차분법을 적용하여 시간에 따른 토석류 이동 형태를 시뮬레이션하게 된다. 또한 이러한 시뮬레이션 결과를 Google Earth에 표현하여 토석류 재해지도의 활용성을 개선하고자 하였다.

• 한국항공우주학회지
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• 제43권9호
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• pp.845-857
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• 2015

최근 우주쓰레기로 인한 우주환경 악화에 대한 국제적인 관심이 높아지고 있으며, 미국, 프랑스, 일본 등 우주개발 선진국들을 중심으로 우주파편 경감을 위한 가이드라인을 제정하여 준수하고자 노력하고 있는 추세이다. 이러한 노력과 더불어 우주파편을 직접 제거함으로써 그 숫자를 경감하고자 하는 기술을 '우주파편 능동제거 기술'이라고 한다. 본 논문에서는 우주파편 경감을 위한 해외 기관들의 연구동향과 배경들을 살펴보고 관련 기술개발 사례 및 특허들을 분석하였다. 또한, 이를 바탕으로 우주파편 능동제거시스템 개발을 위한 소요기술들을 분석해봄으로써 우리나라에서도 관련 연구에 관심을 가지고 본격적으로 시작하고자 하는 연구자들에게 선행연구 분석 자료로써 유용하게 활용될 수 있도록 하였다.

• Smart Structures and Systems
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• 제15권6호
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• pp.1583-1600
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• 2015

When natural disasters occur, including earthquakes, tsunamis, and debris flows, they are often accompanied by various types of damages such as the collapse of buildings, broken bridges and roads, and the destruction of natural scenery. Natural disaster detection and warning is an important issue which could help to reduce the incidence of serious damage to life and property as well as provide information for search and rescue afterwards. In this study, we propose a novel computer vision technique for debris flow detection which is feature-based that can be used to construct a debris flow event warning system. The landscape is composed of various elements, including trees, rocks, and buildings which are characterized by their features, shapes, positions, and colors. Unlike the traditional methods, our analysis relies on changes in the natural scenery which influence changes to the features. The "background module" and "monitoring module" procedures are designed and used to detect debris flows and construct an event warning system. The multi-criteria decision-making method used to construct an event warring system includes gradient information and the percentage of variation of the features. To prove the feasibility of the proposed method for detecting debris flows, some real cases of debris flows are analyzed. The natural environment is simulated and an event warning system is constructed to warn of debris flows. Debris flows are successfully detected using these two procedures, by analyzing the variation in the detected features and the matched feature. The feasibility of the event warning system is proven using the simulation method. Therefore, the feature based method is found to be useful for detecting debris flows and the event warning system is triggered when debris flows occur.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.707-710
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• 2008

Recently, a rivers' bridge that locate on among the mountains area is destroyed by debris accumulation and debris flow, because of frequent occurrence of typhoon and a localized torrential downpour. therefore a river make a part of dam's effect. Actually, this situation gives damages like inundation of a bridge upper stream area's. Generally, It the main cause of the occurrence route of the debris accumulation is that outbreaks of driftwood and debris flow because of landslide, that occurred by severe rain storm. Also, a lot of debris are occurred when big flood come up during long period at this time, this kind of debris accumulation remove to other place, in several, and specially, debris accumlation move to the place where the depth of water is deep and velocity is fast river center. According to these kind of fact, this research put in effect and analyze that movement characteristic's numerical simulations of debris accumulation at flood according to a domestic outside literature investigation, on-site monitoring survey and parameter scenario which comes out through the hydraulic modeling analysis.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.530-533
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• 2007

Our country occurs yearly damage, because of every year in the summer season characteristic localized torrential downpour. Therefor, we will research damage instance and natural calamity reduction effective plan through research against a landslide relation Debris Barrier, And the Debris Barrier decide suitability of Mountains among the Kangwon.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.815-829
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• 2008

Debris flows are a natural hazard which looks like a combination of flood, land and rock slide. Large rainfall in July 2006 produced several large scale debris flows and many small debris flows that resulted in loss of life and considerable property and railway damage, as was widely reported in the national media. The hazard "debris flow" is still insufficiently researched. Furthermore debris flows are very hard to predict. Flexible Ring net barriers are multi-functional mitigation devices commonly applied to rock fall or floating wood protection in floods, snow avalanches and also mud flows or granular debris flows, if properly dimensioned for the process or processes for which they are intended. Overtopping of the barriers by debris flows and sediment transport is possible, supporting the design concept that a series of barriers may be used to stop volumes of debris larger than are possible using only one barrier. The future for these barrier concepts looks promising because these barriers represent the state of art for such applications and are superior to many other available options.

• 기술발표회
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• 통권2006호
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• pp.220-231
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• 2006

Debris flows are a natural hazard which looks like a combination of flood, land and rock slide. Large rainfall in July 2006 produced several large scale debris flows and many small debris flows that resulted in loss of life and considerable property and highway damage, as was widely reported in the national media. The hazard "debris flow" is still insufficiently researched Furthermore debris flows are very hard to predict. In this paper, a general over view of the debris flow problems along the highway, a generic way for the design and dimensioning of flexible barrier systems will be presented. A brief description of the various unique barrier types will be provided, too. The future for these barrier concepts looks promising because these barriers represent the state of art for such applications and are superior to many other available options.