• 한국터널지하공간학회 논문집
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• 제20권6호
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• pp.917-930
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• 2018

도로터널의 방재시설 설계에 화재 위험을 정량적으로 평가하기 위한 정량적 위험도 평가기법이 소방시설물에 대한 성능위주 설계의 일환으로 도입되어 전차종이 통과하는 대단면 터널에 대한 방재시설의 적정성을 평가하는데 활용되고 있다. 그러나 현재 도로 터널에 도입하고 있는 정량적 위험도 평가기법은 대단면 터널에만 적용이 가능하기 때문에 최근 건설이나 계획이 증가하는 소형차 전용 도로터널에 대한 정량적 위험도 평가기법의 개발 필요성이 대두되게 되었다. 이에 본 연구에서는 기존의 터널에 대한 정량적 위험도 평가기법을 기반으로 하여 소형차 전용 도로터널에 적합한 화재발생 시나리오를 제시하고 소형차 전용의 모델터널에 대해서 피난연결통로 간격에 따른 위험도를 분석하고 적용성을 검토하였다. 그 결과로 소형차 전용도로터널의 경우, 현행 사회적 위험도 평가기준을 만족하기 위한 피난연결통로의 적정 간격은 200 m로 평가되었다. 또한 소형차 전용터널에 대한 제배연방식에 따른 위험도를 비교한 결과, 제트팬에 의해서 기류제어가 가능한 대배기구방식이 피난안전확보에 효과적인 것으로 분석되었다.

• 한국가스학회지
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• 제11권4호
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• pp.23-28
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• 2007

정량적 원인분석이 가능한 위험기반검사(KS-RBI) 프로그램을 사용하여 화학설비의 사고 피해범위를 산출하고, 일반적인 정량적 위험성 평가를 수행하는 프로그램인 K-CARM에서 얻은 결과와 비교하였다. 그 결과, KS-RBI 프로그램에 의해 산출한 사고피해 크기는 K-CARM의 결과와 비교적 잘 일치하여 KS-RBI 프로그램이 정량적 위험성 평가에 적극 활용할 수 있을 것으로 기대된다. 또한 사업장에서는 가중평균에 의한 사고 피해영역을 활용함으로써 현실성 있는 피해완화조치와 비상조치계획을 수립할 수 있을 것으로 생각된다.

• 대한안전경영과학회지
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• 제5권2호
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• pp.11-26
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• 2003

While a number of Korean companies have undergone ceaseless restructuring to survive today's rapidly changing global economy, the brick and mortar industry has been exerting their efforts to enhance the productivity through the development of new products, quality improvement, cost reduction measures. At present, various risk-evaluation measures have been taken in the fields at the discretion of an enterpriser, though, the effective methods enabling quantitative analysis are insufficient. Accordingly, this study is intended to contribute to the synthetic safety manage -ment in the factory fields and to suggest the quantitative -risk-analysis system by introducing such safety-estimation steps as assortment of processes, pre-assessment of risk factors, decision of risks, counter measures against studied risks, establishment of remedies.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.1205-1210
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• 2005

The behavior of rock mass and solute(e.g. groundwater, radioactivity) flow in fractured rock can be directly influenced by joint roughness. The characteristics of joint roughness is also a main factor for the rock classification(e.g. RMR, Q system) which is usually used in tunnel design. Nevertheless, most of JRC estimation has been carried out only by the examination with the naked eye. This JRC estimation has a lack of objectivity because each investigator judges JRC by his subjective opinion. Therefore, it will be desirable that the assessment of JRC is performed by a numerical analysis which can give a quantitative value corresponding to the characteristics of a roughness curve. Meanwhile, roughness curves for joint surfaces which are observed in drill cores have been obtained only along linear profiles. Although roughness curves are measured in the same joint surface, they can frequently show diverse aspects in a standpoint of roughness characteristics. If roughness curves can be measured along the elliptical circumferences of joint surfaces from core scanning images or Televiewer images, they will certainly be more comprehensive than those measured along linear profiles for roughness characteristics of joint surfaces. This study is focus on dealing with (1) extracting automatically roughness curves from core scan image or Televiewer image, (2) improving the accuracy of quantitative assessment of JRC using fractal dimension concept.

• KIEAE Journal
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• 제14권1호
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• pp.49-57
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• 2014

Global warming has become a major issue all over the world. Noting the carbon dioxide emissions as a main contributor to global warming, we studied on the methods to reduce the life cycle building carbon emissions. Green Building Certification Criteria(GBCC) has been implemented since 2002 in Korea, but it doesn't estimate the quantities of the $CO_2$ emissions. Therefore, we studied the ways to implement the $CO_2$ emissions in quantity to GBCC. We select a government building which was rated excellent by the GBCC. This office building was regarded to excellent building by GBCC but not good for energy consumption. It was found energy glutton buildings for research by the Ministry of Public Administration and Security in 2010. This part of GBCC is need to be improved.. Also LCA (Life Cycle assessment) was carried out to estimate on carbon footprint on this office building. So we need to implementing quantitative evaluation on the amount of carbon emissions by GBCC. And it is possible to implementing quantitative evaluation on the amount of carbon emissions. Through this study, we expect that quantitative assessment of life cycle carbon emissions of buildings by the GBCC. Also expect to reduce the carbon emissions of the building by improving the GBCC.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제37권
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• pp.13.1-13.7
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• 2015

Background: This study evaluated Somatosensory evoked potentials (SEP), Quantitative sensory testing (QST), and thermography as diagnostic methods for nerve injury. Methods: From 2006 through 2011, 17 patients (mean age: 50.1 years) from ${\bigcirc}{\bigcirc}{\bigcirc}{\bigcirc}$ Hospital who sought care for altered sensation after dental implant treatment were identified. The mean time of objective assessment was 15.2 months after onset. Results: SEP of Inferior alveolar nerve(IAN) was $15.87{\pm}0.87ms$ on the normal side and $16.18{\pm}0.73ms$ on the abnormal side. There was delayed N20 latency on the abnormal side, but the difference was not statistically significant. In QST, the abnormal side showed significantly higher scores of the current perception threshold at 2 KHz, 250 Hz, and 5 Hz. The absolute temperature difference was $0.55^{\circ}C$ without statistically significance. Conclusion: These results indicate that QST is valuable as an objective method for assessment of nerve injury.

• 대한공간정보학회지
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• 제17권3호
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• pp.33-40
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• 2009

본 연구에서는 모자이크 영상에 대하여 정량적인 품질평가지수에 대한 적용 가능성을 제시하였다. 우선, 영상 품질평가를 위해 접합영상의 접합선을 이용한 연속성 평가와 색상을 이용한 유사성(similarity) 및 대비(contrast)를 이용하여 품질평가지수를 산정하였다. 선정된 품질평가 항목을 기반으로 최종적인 품질평가지수를 산정하여 실험자에 의한 주관적 평가와의 비교, 검증을 수행하였다. 그 결과 정량적 품질평가지수가 주관적 평가지수와 유사한 결과를 나타냄으로써 제시한 영상 품질평가지수를 이용하여 제작된 모자이크 영상에 대한 정량적이고 객관적인 모자이크 영상의 품질평가가 가능하다는 것을 보여주었다.

• 한국가스학회지
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• 제2권2호
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• pp.12-17
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• 1998

급속한 도시가스 보급률의 증가로 인해 국내 도시가스시설에서는 많은 사고가 일어났었다. 이러한 도시가스 사고에 대한 예방 대책으로 여러 관련기관에서는 도시가스의 물성치등 안전 관련 자료들과 도시가스시설에 대한 정보들을 부분적으로 구축$\cdot$관리하고 있다. 하지만 각 기관들이 구축한 정보들을 공유하고 있지 않기 때문에 정보들을 중복되게 구축$\cdot$관리하고 있어 이에 대한 효율성이 결여되어 있다. 따라서 정보 관리와 공유를 효과적으로 할 수 있으며, 정보들을 이용하여 정량적 위험성 평가 및 방재 계획을 지원할 수 있는 지리정보시스템에 관한 연구를 하였다.

• Journal of Information Technology Applications and Management
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• 제28권4호
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• pp.79-101
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• 2021

The purpose of this research is to define detailed technologies of smart city based on excellent patents through patent analysis related to major technologies of smart city, and to use quantitative indicators to classify relatively high technology importance and identify related technologies. To achieve the purpose of the study, patent collection is conducted by reflecting literature research and expert opinions based on information related to the smart city Internet of Things/Internet of Things communication core technology. Also, DEA were used to determine the relatively high technology. The inputs and outputs used in the study used quantitative indicators to determine technical value and made up of impact assessment, performance assessment and value assessment. As a result of the analysis, various technology groups were classified into smart city-related platform technologies, information sharing technologies, and network-related technologies, and based on the results of this research, it is expected that it will be able to apply technology patents related to smart cities to research and development strategies through key detailed technologies by major technologies of Smart City.

• Geomechanics and Engineering
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• 제24권3호
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• pp.281-293
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• 2021

Uncertainties in geomechanical input parameters which mainly related to inappropriate data acquisition and estimation due to lack of sufficient calibration information, have led wellbore instability not yet to be fully understood or addressed. This paper demonstrates a workflow of employing Quantitative Risk Assessment technique, considering these uncertainties in terms of rock properties, pore pressure and in-situ stresses to makes it possible to survey not just the likelihood of accomplishing a desired level of wellbore stability at a specific mud pressure, but also the influence of the uncertainty in each input parameter on the wellbore stability. This probabilistic methodology in conjunction with Monte Carlo numerical modeling techniques was applied to a case study of a well. The response surfaces analysis provides a measure of the effects of uncertainties in each input parameter on the predicted mud pressure from three widely used failure criteria, thereby provides a key measurement for data acquisition in the future wells to reduce the uncertainty. The results pointed out that the mud pressure is tremendously sensitive to UCS and SHmax which emphasize the significance of reliable determinations of these two parameters for safe drilling. On the other hand, the predicted safe mud window from Mogi-Coulomb is the widest while the Hoek-Brown is the narrowest and comparing the anticipated collapse failures from the failure criteria and breakouts observations from caliper data, indicates that Hoek-Brown overestimate the minimum mud weight to avoid breakouts while Mogi-Coulomb criterion give better forecast according to real observations.