• 한국환경과학회지
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• 제25권7호
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• pp.989-998
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• 2016

In this study, we analyzed the content and compensation factors of 337 cases of national environmental disputes from five recent years (2000~2014). Causes of damage were noise-vibration in 234 cases (69%), sunlight in 48 cases (14%), air pollution in 19 cases (6%), water pollution in 15 cases (4%), odor in 13 cases (4%), and others factors in 8 cases (3%). Sources of damage were construction in 224 cases (66%), structures in 36 cases (11%), vehicle on road in 31 cases (9%), industry in 18 cases (5%), environmental facility in 11 cases (3%), livestock facility in 6 cases (2%), and other sources in 11 cases (3%). From the results of logistic regression analysis, important factors associated with compensation were found to be damage amount, damage distance, zoning districts, source, and administrative disposition.

• Tribology and Lubricants
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• 제17권1호
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• pp.16-21
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• 2001

The wear particles is released from the moving surfaces in gear systems of transmission and its morphology is directly related to the damage and failure to gear system from which the particles originated. It is the effective method for damage condition estimation of automobile transmission gear to observe wear debris in gear oil. We tested with new transmission and took out gear oil according to driving distance. To be applied to damage condition of gear system in transmission of automobile,4 shape parameters of wear particles in gear oil were calculated and wear volume were presumed with the image processing system.

• 시큐리티연구
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• 제2호
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• pp.83-98
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• 1999

The LPG station's explosion at Bucheon city was a major accident which with rare frequency of occurrence but large damage effect. Therefore, to prevent similar accident in the future from LPG chargings stations which located at inner urban area, it needs to identify the damage effects of such facilities by comparing theoretically quantities risks-PHAST. The BLEVE effects from the accident showed similar level in case of heat flux, however, the over pressure level reflected at reduced distance. The structure damage to the nearby area showed comparatively large reduction of concrete strength and shape changes through by heat effect while the overpressure effect was small.

• 한국BIM학회 논문집
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• 제13권4호
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• pp.64-73
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• 2023

This study introduces a method of estimating the 3D coordinates of structural damage from the detection results of visual inspection provided in 2D image coordinates using sensing data of UAV and 3D shape information of BIM. This estimation process takes place in a virtual space and utilizes the BIM model, so it is possible to immediately identify which member of the structure the estimated location corresponds to. Difference from conventional structural damage localization methods that require 3D scanning or additional sensor attachment, it is a method that can be applied locally and rapidly. Measurement accuracy was calculated through the distance difference between the measured position measured by TLS (Terrestrial Laser Scanner) and the estimated position calculated by the method proposed in this study, which can determine the applicability of this study and the direction of future research.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.599-607
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• 2017

본 논문은 2015년 화학물질관리법 시행에 따라 일정 수량 이상 화학물질을 취급함으로써 장외영향평가서와 위해관리계획서를 제출할 의무가 있는 영세 및 중소기업들을 대상으로 행정 경제적인 부담을 줄이고자 위험성 평가에 대한 실질적인 피해 영향범위를 판단한 것이다. 사고대비물질 중 액체상 물질인 질산, 메탄올, 아세트산에 대하여 독성 누출 시 피해 영향범위를 산정하였고, 저장 및 누출량에 따른 독성피해 영향범위를 판단할 수 있는 상관관계식을 도출하였다. 본 연구의 상관관계식으로 산정된 독성 누출시 피해 영향범위 결과와 실제 사업장의 사고 시나리오에 따른 KORA(장외영향평가서, 위해관리계획서 작성 지원 범용프로그램) 결과를 비교하여 적용 및 검증을 실시하였다. 따라서 본 연구의 물질별 상관관계식은 도로 혹은 사업장에서 사고대비물질 누출사고가 발생했을 경우, 독성피해 영향범위를 빠르게 판단함으로써 비상조치계획의 수립과 비상상황에 신속하게 대응할 수 있을 것이다. 또한, 영세 및 중소기업 사업장은 화학물질관리법에 따른 장외영향평가와 위해관리계획서를 제출할 때 위험성평가 활용이 가능하며, 저장 및 누출량에 따라 예상되는 독성피해 영향범위를 간단하게 확인 및 평가할 수 있을 것이다.

• 한국안전학회지
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• 제14권2호
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• pp.109-115
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• 1999

The release of gas from the LPG storage tank by the rupture or leakage can occure explosion and this causes serious damage to people and structures. In this study, the explosion effect and damaging distance were measured for the LPG cloud explosion to perform the quantitative risk assessment for the PSM, and the effective parameters on the explosion were found. The gas dispersion and mass contaminant in the explosion limits were calculated by using DEGADIS, and it was converted to TNT equivalency and damaging distance. As a result, the wind speed was the most effective parameter on the diffusion rate and TNT equivalency, and the damaging distance were increased with decrease of wind speed and surface roughness.

• Journal of information and communication convergence engineering
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• 제10권2호
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• pp.181-186
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• 2012

Telematics services include automatic location tracking for emergency rescue, which is available for use in case of a car accident due to falling off roadways. This paper presents a simulation study on how far a car will fall before it hits the ground if it drops off of a roadway due to an accident or a natural disaster. The greatest horizontal distance the falling car can travel is presented in this paper, based on the assumption that air resistance as well as the direction and degree of acceleration due to gravity is negligible. This paper also presents the depth of the dent caused by the car sinking into the ground, the time it took for the car to fall free, and the velocity at which it travelled and horizontal distance it traveled. In this paper, the damage done to cars that crash into the ground and the dangers thereof are graphically represented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.62-64
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• 2005

Indium Tim Oxide(ITO) thin film was prepared for TOLEDs by Facing Targets Sputtering(FTS) apparatus which can suppress the damage of organic layer due to the collisions of high energetic particles. In particular, ITO thin film was prepared with changing the distance between two targets for reduced the bombardment by high energetic particles such as ${\gamma}-electron$ or negative oxygen ions. The electrical and optical properties of ITO thin films as a function of distance of between two targets were measured. Additionally, the ITO thin films were prepared on the cell (cell : MgAg/LiF/EML/HTL/ bottom electrode) with distance of between two targets. And the I-V characteristics of ITO/cell was investigated.

• Structural Engineering and Mechanics
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• 제67권5호
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• pp.427-437
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• 2018

Structural pounding is commonly observed phenomenon during major ground motion, which can cause both structural and architectural damages. To reduce the amount of damage from pounding, the best and effective way is to increase the separation distance. Generally, existing design procedures for determining the separation distance between adjacent buildings subjected to structural pounding are based on approximations of the buildings' peak relative displacement. These procedures are based on unknown safety levels. The aim of this research is to estimate probabilistic separation distance between adjacent structures by considering the variability in the system and uncertainties in the earthquakes characteristics through comprehensive numerical simulations. A large number of models were generated using a robust Monte-Carlo simulation. In total, 6.54 million time-history analyses were performed over the adopted models using an ensemble of 25 ground motions as seismic input within OpenSees software. The results show that a gap size of 50%, 70% and 100% of the considered design code for the structural periods in the range of 0.1-0.5 s, leads to have the probability of pounding about 41.5%, 18% and 5.8%, respectively. Finally, based on the results, two equations are developed for probabilistic determination of needed structural separation distance.

• 한국해안해양공학회지
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• 제19권2호
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• pp.113-127
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• 2007

본 연구에서는 직립 방파제 케이슨의 활동에 따른 복구비용, 과도한 케이슨 활동 발생시 항만 폐쇄에 따른 경제적 피해 비용 그리고 월파에 의한 일시적 작업 중단에 따른 경제적 피해 비용을 동시에 고려하는 기대 총 건설비 산정 모델을 수립하였다. 발생시점이 서로 다른 피해 비용을 일정한 기준으로 산정하기 위해 할인율을 적용하였다. 케이슨의 최적 단면은 방파제 수명 동안의 기대 활동량의 허용범위 내에서 기대 총 건설비용이 최소가 되는 단면으로 정의되며, 그 기대 활동량의 허용치는 0.3 m와 0.1 m 두 가지 경우에 대해 살펴보았다. 과도한 케이슨 활동에 의한 항만 폐쇄에 따른 경제적 피해 비용과 그 산정 기준이 케이슨 복구비용이나 월파에 의한 작업 중단에 따른 경제적 피해 비용보다 최적 단면 결정에 더 중요한 요인임을 확인하였고, 항만 폐쇄에 대한 케이슨 활동량의 임계 칼이 커질수록 케이슨의 최적 단면은 기대 총 건설비의 최소점보다 기대 활동량의 허용치에 의해 결정되는 것으로 나타났다.