• 한국군사과학기술학회지
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• 제18권2호
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• pp.146-153
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• 2015

An unmanned aerial photography method by using an unmanned helicopter is useful method for measuring of the water-entry traces of small falling objects into the sea. Pixel sizes on the aerial photograph may be too large due to a limit of camcorder resolution and a wide shooting area. If the pixel size is too large, identification of water-entry trace is impossible. Thus an accurate prediction of water-entry trace size is required. The traces of water-entry could be classified into three types such as splash, water column, and bubble. Diameters of each trace are predicted by water-entry impact pressure theories, cavity theories, and trial test results. The results are verified by drop tests using an unmanned helicopter at two water-entry speeds. As a result, prediction and test results showed sufficient similarity to evaluate the identifiability of water-entry trace.

• 환경영향평가
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• 제1권1호
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• pp.21-30
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• 1992

Environmental Impact Assessment(EIA) is developing as a tool for environmentally sound and sustainable development in Korea. For more effective implementation of it, we try to apply Environmental Information System (EIS) to EIA process. EIS is composed of geographic and attribute data related to environment and Geographic Information System(GIS), and it will be applied to scoping, prediction, and alternative assessment, etc. in EIA. This study focuses on application of geographic data using GIS in suitability analysis of alternative assessment. We use TIN, buffering, and overlaying in GIS functions.

• Computers and Concrete
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• 제30권1호
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• pp.19-32
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• 2022

This paper presents an investigation into the failure of RC columns under impact loadings. A numerical simulation of 19 identical RC columns subjected to single and repeated impact loadings was performed. A free-falling hammer was dropped at midspan with the same total kinetic energy input but varying mass and momentum. The specimens under the repeated impact test were struck two times at the same location. The colliding index, defined as the impact energy-momentum ratio, was proposed to explain the different impact responses under equal-energy impacts. The increase of colliding index from low to high indicates the transition of the impact response from static to dynamic and failure mode from flexure to shear. This phenomenon was more evident when the column had a greater axial load and was impacted with a high colliding index. The existence of the axial load had an inhibitory effect on the crack development and increased the shear resistance. The second impact changes the failure mode from flexural to brittle shear as found in the specimen with 20% axial load subjected to high a colliding index. Moreover, a deflection prediction equation based on the impact energy and force was limited to the low colliding index impact.

• 환경영향평가
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• 제29권5호
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• pp.391-402
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• 2020

국내 법적 근거를 가진 건강영향평가(Health Impact Assessment)는 환경영향평가 항목 중 위생공중보건 항목에서 작성 수행되고 있다. 택지개발 등 주거지 개발사업들은 「환경보건법」 제13조에 따른 건강 영향평가 대상사업은 아니다. 하지만 환경영향평가협의회 단계에서 인근 산업단지 등 오염원에서 배출되는 물질 중 건강영향평가 대상물질을 확인하여 위해도(발암·비발암 포함)를 산정하여 제시하라는 심의내용에 근거하여 부분적인 건강영향평가로 수행하고 있다. 주거지 개발사업은 특정대기유해물질 등 오염물질 배출시설 계획이 없지만 주변 산업단지와 같은 대기오염 발생원에서 배출되는 오염물질에 의해 향후 입주하는 계획지구 주민들에게 건강영향을 미칠 수가 있다. 본 연구에서는 실제 도시개발사업 사례를 분석하여 미래에 입주하는 계획지구 입주민들에게 미치는 영향을 검토하고자 하였다. 미래에 영향 검토 시 주변지역에 대한 문헌을 통한 예측 case1, 대기확산모델(AERMOD)을 이용한 발암성물질 노출농도예측과 기여도 분석 case2를 하였다. 본 연구를 통해 계획지구 인근 산업단지 등의 오염원에 대한 수용체를 고려한 건강영향평가 방법으로는 현황조사와 대기확산모델(AERMOD)을 이용한 노출농도예측 및 기여도분석을 상호 보완적으로 적용하여 평가하는 것이 효용성이 높은 것으로 판단되었다.

• 한국안전학회지
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• 제29권1호
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• pp.15-20
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• 2014

The silicon as the hyper-elastic material was used to design the shock programmer and dynamic characteristic of the shock programmer was studied. The shock programmer was a structure part that was mounted between the impactor and the test bed. The role of the shock programmer was to generate the acceleration time history by the objective of various impact tests. The effective elastic modulus of the silicon was varied under the velocity of the impactor. The effective elastic modulus of the silicon was estimated by the comparison with results between test and simulation.

• 환경영향평가
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• 제33권2호
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• pp.64-73
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• 2024

개발사업으로 인한 서식지 파괴의 심각성이 대두되면서 생물다양성을 보전하기 위해 환경영향평가(EIA)의 중요성은 커지고 있다. 경관스케일에서 개발 요인과 주변 환경요인에 따른 생물다양성 영향을 정량적으로 평가하기 위해 선행연구들이 진행되고 있으나, 개발사업을 기준으로 생물다양성 감소에 영향을 미치는 요인에 대한 연구는 미흡한 실정이다. 본 연구는 선행연구를 통해 유효하다고 밝혀진 독립변수(사업 면적, 사업 유형, 고도, 생태·자연도, 녹지와의 이격거리, 보호구역과의 이격거리)들을 다중클래스 로지스틱 회귀분석, T-test, 사업 유형 검토분석을 통해 종풍부도 변화에 유의미한 영향을 미치는지를 검토하였다. 연구 결과, 토지 피복 단위에서 생물다양성에 영향을 끼치는 것으로 밝혀진 요인 중 사업 규모와 환경영향평가 시 종풍부도 값만이 p-value=0.05 이하의 값을 보였다. 그리고 사업 유형의 경우, 체육시설의 설치, 에너지 개발, 산업입지 및 산업단지의 조성에서 조류의 생물다양성 감소가 크게 변화하는 것을 확인하였다. 본 연구를 통해 분석 규모에 따라 영향을 끼치는 변수에서의 차이가 발생할 수 있음을 확인하였기에, 환경영향평가에서 생물다양성 변화를 분석하기 위해서는 개발사업 단위에서의 지표 활용에 연구가 추가로 필요할 것이며, 타 생물종으로의 일반화를 위해 추가적인 연구가 필요할 것으로 사료된다.

• 농촌계획
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• 제25권2호
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• pp.99-117
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• 2019

Environmental impact assessment (EIA), which predicts, evaluates, and manages the influences on natural landscape, plays a role of monitoring natural resources for systematic management of natural landscape. However, the function of verification and correction of the system is still insufficient and feed-back, one of the most important features of EIA follow-up, has not been introduced in Korea's EIA system yet. As a procedure, it is required to check if the opinions of the evaluators are properly reflected to the outcomes of the project through a reviewing process after assessing environmental impacts of a development project. In reality, despite the awareness about the importance of follow-up inspection of the conformity with, the system mainly focuses on the agreement during the planning stage of the development project and fails to continuously manage after its completion. There have been various preceding studies related to prediction, evaluation, and management of environmental impacts on natural landscape for better management. They primarily dealt with the problems in the EIA process and suggested improvement measures, including directions for institutional development, step-by-step goals, and operation methods, to address the problems which arise in the EIA follow-up process. However, suggested measures are not actively applied with the focus only put on institutional operation, there are virtually no standardized methods to predict and assess landscape changes due to the development project and to manage landscape after the project. Against this backdrop, this study aims to explore the existing methods to analyze the impacts natural landscape and to establish a system where landscape management is continued after the development project. To this end, we will suggest reducing methods according to the predicted changes in landscape for post-project management of natural landscape. Characteristics of reduction methods by project type were examined through reviewing the guide to natural landscape rating and the importance of development project impacts on natural landscape by type of reduction was evaluated through questionnaire for experts. Evaluated types of reduction are classified and presented by characteristics of each development project and content of reduction type.

• 한국환경복원기술학회지
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• 제19권2호
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• pp.109-119
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• 2016

In South Korea the need of sustainably managing development on forest lands has required to develop a new approach to estimating environmental impacts on forest surrounding development sites in a scientific manner. As for forest-related development, two types of development were selected: golf courses and industrial complexes. Using Fragstats 4.2, the fragmentation effects and patterns of each type by forest area within project sites and buffer zones ranging from the outside of project sites up to 2,000 meters were analyzed. As a result, golf courses were strongly related to a group of fragmentation indexes: CA, NP, PD, TE, LSI, TCA, NDCA and CONNECT, whereas industrial complexes were associated with CA, NP, PD, TE, LSI and CONNECT. Among them, NP, LSI, TCA and NDCA of golf courses were considered as representative indexes reflecting the average impact ranges of each sub-group by forest area, and focussing on the size of core areas. In the case of industrial complexes, PD, TE and LSI were the representatives, vulnerable to the composition of given landscape. For two case studies, one for golf courses and the other for industrial complexes, they showed there existed a difference between the average of a group and the individual results. Therefore, to minimize the variations in impact range within a group, it is needed to analyze more individual cases. This study proved there was a distinction between project types in terms of the range of environmental impact. To effectively and comprehensively manage forest development, further research on analyzing other development types related to forests with more cases is needed.

• 한국군사과학기술학회지
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• 제18권3호
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• pp.234-243
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• 2015

It is required to have the capability to predict the impact point of the ballistic target in order to assign the firing unit with high engagement possibility for the interception in the ballistic target defense systems. In this paper, a novel method is proposed to predict the impact point of the ballistic target using a flight phase discrimination algorithm given the insufficient measurements on the partial trajectory. The flight of a ballistic target is composed of a boost phase and a ballistic phase with different dynamics. The flight phase is discriminated by using the normalized innovation distance between measurements and a priori estimated measurements. The threshold and tolerance in the flight phase discrimination are determined from the probabilistic characteristics of the estimation error. Monte Carlo simulations are performed to verify the proposed method.

• 환경영향평가
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• 제15권3호
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• pp.165-178
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• 2006

Environmental Impact Assessment (EIA) and Environmental Management Systems (EMS) are perceived by many to be separate environmental tools. EIA serves as a systematic and predictive tool for assessing the potentially significant impacts of developments on the environment. An EMS, on the other hand, is used to consider the key impacts of operational businesses on the environment. The main difference to note is that during the EIA process impacts on developments are predicted. A proposed development has yet to be built and therefore an element of uncertainty is associated with these assessments. With an EMS, the business or organization's processes are already in operation. Even though there is also an element of prediction involved, it is a comparatively easier task to investigate what the environmental impacts of these processes are. However, in contrast with the orientation of EIA to further development actions, EMS involves the review, assessment and incremental improvement of an existing organization's environmental effects. EMS can thus be regarded as a continuation of EIA principles into the operational stage of a policy, plan, program and project. EIA may be carried out without fully supporting necessary informations to EMS.