• 한국건설관리학회논문집
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• 제18권4호
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• pp.48-56
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• 2017

건설사업은 목적물의 특성, 사업규모, 계약방식 등에 따라 다양한 사업주체가 참여하고 그로인해 복잡한 의사소통 구조를 가지고 있기 때문에 이해관계의 대립으로 인한 클레임 및 분쟁이 지속적으로 발생하고 있다. 그런데 분쟁의 사례를 살펴보면 상당수가 시공사와 발주자 사이에서 발생하고, 발주자의 우월적 지위에 따른 불공정 관행이 원인이 되어 분쟁이 제기되고 있다. 이에 본 연구는 상대적으로 계약적 약자인 시공사를 정보 활용 주체로 설정하고 대한상사중재원의 중재판정 사례를 바탕으로 분쟁 발생 유형 및 원인별 분석뿐만 아니라 보상비용 등에 관한 분석을 수행하여 시공사의 분쟁에 따른 시간적, 경제적 손실을 최소화하고자 하였다. 이를 통해 공사 수행 중 발생 가능한 분쟁 대응전략을 수립하는데 도움을 줌으로 써 원활한 합의 유도 및 공사의 완성도를 높이는데 기여할 수 있을 것으로 기대한다.

• 한국화재소방학회논문지
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• 제25권3호
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• pp.1-7
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• 2011

본 논문은 부산 실내사격장 화재와 관련하여 불과 수 초 이내에 급격하게 연소 확대된 원인에 대하여 연구하였다. 급속한 연소 확대 원인 분석을 위하여 실내사격장에 광범위하게 사용되는 스펀지형 흡음재의 연소실험을 수행하였다. 흡음재 연소 실험결과, 일반형의 경우, 착화와 동시에 급속히 연소되는 특징을 나타내었다. 난연 처리된 흡음재는 착화와 동시에 자체 소화되는 특성을 나타내었으나, 화약잔사를 난연 흡음재에 부착시키는 경우, 착화와 동시에 급격히 연소되는 결과를 나타내었다. 발화원인에 대한 분석을 위하여 총기사용 과정에서 발생되는 유탄의 비산거리 및 크기를 실측하였으며, 화약잔사에 대한 충격 강도 실험 결과를 바탕으로 최소 착화 에너지를 계산하였다. 유탄의 충격 후, 탄속 감소 및 유탄의 크기에 따른 운동에너지 계산을 통하여 유탄이 화약잔사에 충격하는 경우, 충분한 발화 가능성이 있음을 확인하였다.

• 한국산학기술학회논문지
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• 제22권1호
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• pp.305-312
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• 2021

본 연구는 미세조직 분석을 통한 잠수함 탈출 트렁크 해치 스프링 파손부 개선에 관한 내용으로 잠수함 건조 중 발생한 탈출 트렁크 파손에 대한 발생원인 및 개선방안에 대해서 검토 하였다. 탈출 트렁크 스프링 파괴에 대한 원인 규명을 위해서 파손된 제품에서 시편을 채취하여 형광분석기를 이용한 재질의 화학성분을 비교 분석 하였고, 기계적 특성 변화를 검토하기 위해 파손부 주위로 비커스 경도를 측정 하였다. 특히, 스프링 파손부는 광학현미경 및 주사전자현미경을 이용하여 파면을 심층적으로 관찰하여 균열의 시작점 및 전파 경로를 확인하여 파괴에 대한 원인을 규명하고자 하였다. 최종적으로는 스프링 파손 원인 규명을 통한 스프링 형상 설계 방안을 제시하였고, 추가적으로 내부식성 및 내마모성이 우수한 나일론 도장을 도포하여 신규로 개선된 스프링을 제작 하였다. 실제 건조중인 잠수함 트렁크 해치에 부착하여 시험한 결과 기존 제품에 비해 해치 여닫음 시 스프링 간 접촉에 의한 도장 벗겨짐 현상이 감소하여 개선의 효과를 확인 하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.806-811
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• 2007

In this study, we propose a more systematic design process for the structure-borne noise. The proposed way consists of 4 steps: Problem definition, Cause analysis, Development of counter-measure and Validation. Especially, we improved the second step: Cause analysis. According to the PCA(Panel Contribution Analysis), a reduction in vibration of the panels of which panel contribution is positive and larger, results in a reduction in structure-borne noise. We have, however, met the case in which the concept of PCA is no valid in a few vehicle tests. In order to understand this phenomenon, we compared the major panels selected by PCA with the one chosen by DSA(Design Sensitivity Analysis). After investigating the difference between the two results, a more improved process is suggested. The proposed one for the second step in the design process consists of not only the previous way: PCA with deformation analysis results but also DSA. It is finally validated that the proposed design process decreases the sound pressure of the concerned noise transfer function more than 3.5 dB.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.141-147
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• 2005

Usually, processing whole project or a part of frame work delays due to acceleration, changing orders, management, characters of project. overtime, worker crowding, early occupation in the field of construction. Through a whole project, these factors cause decreasing construction labor-productivity which is the most dependent in business of construction. These kind of decreasing of construction labor-productivity cause many negative effects, just as extension of time, increasing cost in project of construction. Regardless of characters of construction or decreasing labor-productivity, extension of time is a incident which needs acceleration, also it cause a high possibility of claim and dispute. The productivity has just a broad meaning in business of construction. That's why it's difficult to apply in the field of construction. Especially, factors increasing or decreasing labor-productivity is defined by analysis of working as qualitative and outlined evaluation. However, study of the each factor decreasing construction labor-productivity analysis has not researched, because of difficulty of systematic measurement and management. The existed studies about management of productivity are just focused on estimation of productivity, not on evaluation of productivity. It was true that I couldn't examine clearly about the analysis of how much important per each the factor which have influence on labor-productivity because of the characteristic as qualitative that the labor productivity have On this study, i tried to get the factors decreasing of labor- productivity with gathering opinions of panels of expert's studies about the factors decreasing of labor-productivity on project of construction through Delphi method and i evaluated the result factors as quantitatively and subjectively about importance of factors decreasing construction labor-productivity Analysis, using AHP Method by Saaty. Also, using Delphi and AHP method, 1 suggest substantiated method qualitative factors are measured by quantitative criteria.

• 조명전기설비학회논문지
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• 제18권3호
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• pp.142-148
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• 2004

최근 전자계-열계 해석 소프트웨어의 발전에 힘입어 전자계-열계 해석 이론을 바탕으로 컴퓨터 시뮬레이션에 의한 전기화재의 정확한 원인분석과 조사가 체계적으로 연구되고 있으나, 매우 미흡한 실정이다. 따라서 본 논문에서는 비닐 평형 코드(600 V, VFF, $2C{\times}$1.25mm^2)을 모델로 하여 과전류시 전류크기에 따른 전선의 온도분포 및 이격거리에 따른 도체 상호간의 힘을 컴퓨터 시뮬레이션(Flux2D)을 통하여 계산하며, 또한 직접 제작한 대전류 공급장치(형명 : EHT_EFAD, Korea)을 사용하여 과전류시 전류크기와 공급시간에 따른 도체 상호간의 이격거리에 대하여 실험함으로써 과전류로 인한 전기화재 원인분석 방법에 대하여 제안하고자 한다.

• Design & Manufacturing
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• 제10권1호
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• pp.19-25
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• 2016

Connectors are very important components that transmit electric signals to different parts. It must maintain intensity of the connector to prevent defects from impact and maintain contact to transmit electric signals. Most of the external parts of the connector, which act as the main framework, are formed by injection molding. However, bend deformation occurs for injection molded products due to the residual stress left inside the product after product molding. When the bend deformation is large, it does not come into complete contact when being assembled with other parts, which leads to connector contact intensity not being properly maintained. In result, the main role of the connector, which is to transmit electric signals, cannot be performed. In order to address this problem, this study conducted bend deformation cause analysis through bend deformation analysis to predict and prevent bend deformation of housings and wafers, which are injection molded products of pressure welded connectors that are normally applied in compact mobile and display products. Bend deformation analysis was carried out by checking the charging time, pressure distribution and temperature distribution through wire to board connector wafer and housing injection molding analysis. Based on the results of the bend deformation analysis results, the cause of the bend deformation was analyzed through deformation resulting from disproportional cooling, deformation resulting from disproportional contraction, and deformation resulting from ingredient orientation. In result, it was judged that the effects for bend deformation were biggest due to disproportional contraction for both the pressure welded connector wafer and housing.

• 품질경영학회지
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• 제46권2호
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• pp.327-338
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• 2018

Purpose: A risk evaluation procedure is proposed for common failure causes in FMEA(Failure Mode and Effects Analysis). The conventional FMEA does not provide a proper means to compare common failure causes with other failure causes. This research aims to develop a risk evaluation procedure in FMEA where common failure causes and other failure causes exist together. Methods: For each common failure cause, the effect of each combination of its resulting failures is recommended to be reevaluated considering their interactive worsening effect. And the probability that each combination of failures is incurred by the same common cause is also considered. Based on these two factors, the severity of each common cause is determined. Other procedures are similar to the conventional method. Results: The proposed procedure enables to compare and prioritize every failure cause. Thus, the common causes, each of which incurring two or more failures, and other causes, each of which is corresponding to one failure, can be fairly compared. Conclusion: A fair and proper way of comparing the common failure causes and other causes is provided. The procedure is somewhat complicated and requires more works to do. But it is worth to do.

• 보건행정학회지
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• 제21권2호
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• pp.329-348
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• 2011

This research analyzed 168,010 cases of death of the aged over 65 from 244,867cases of death excluding 7 unknown age cases from 244,874 all age cases of death by using the death data of the National Statistical Office for 2007 to figure out factors affecting the quality of causes of death statistics of the aged and to suggest the ways of improving the quality of death statistics of the aged in korea. This research tried to derive factors affecting ill-defined cause of death category in acordance with WHO's guidelines and to find causes of lowering the accuracy of causes of death statistics of the aged. This research identified the problems of causes of death statistics of the aged by using both demographic characteristics such as sex, age, marital status, educational attainment, residential region, region size and factors of death items as independent variable to find causes of ill-defined cause of death of the aged. Logistic regression analysis was executed to calculate the hazard ratio about the ill-defined causes of death of the aged and multiple regression analysis was conducted to derive factors affecting the ill-defined cause of death by regional groups through using these independent variables such as the component ratio of over age 65, female death rates, doctors insitutions rate, medical institutions rate, attaching rates of death certificate by neighborhood. As a results of this research, R-code was the highest of ill-defined causes of death, accounting for 82.1%, and senility death(R54) of R-code was the highest, accounting for 91.2%. through subdivided order distribution of the ill-defined causes of death of the aged. As ill-defined causes of death by regional groups, attaching rates of death certificate by neighborhood was the most important factor(p<0.05) and also showed regression model's description with 83.8% ($R^2$=83.8%). Furthermore, Jeon-nam was the highest in the regional groups and these regions such as Je-ju, Jeon-buk, Chung-nam were not only attaching the death certificate by neighborhood but also were high at the rate of ill-defined causes of death. Therefore, this research found that both reconsideration about death certificate by neighborhood and education for doctors who write death certificate were needed the most.

• 한국안전학회지
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• 제22권4호
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• pp.26-31
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• 2007

According to the statistical analysis on the electrical fire of 2005 years, most of electrical fire is generated from short circuit(4,985 cases), overcurrent(755 cases) leakage current(391 cases), poor contact(378 cases), disconnection(36 cases) on the electrical wiring device. The researches for the fire hazard about normal electric wiring have already been progressing in the advanced country such as USA and Japan, but Comparative study of the disconnection has not been conducted. Therefore, in this paper, we have simulated the thermal analysis for electrical wire according to deteriorating time in a normal state and disconnection with electrical wire using the electrical-thermal finite element method(Flux 3D). This paper acquire basis data of electricity fire signal by disconnection and wish to help for electrical fire cause diagnosis business.