• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.131-131
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• 2019

최근 기후변화와 여름철 고온 등으로 인한 녹조현상, 각종 사고로 인한 화학물질 및 유류 유출 등 수질오염과 관련된 사회적 관심이 높아지고 있다. 특히, 화학사고로 인한 유해화학물질 유출은 접촉시 인체에 악영향을 끼치며, 대기 수질 토양을 오염시키고 주변 농작물의 변색이나 괴사를 유발하는 등 발생 시 적절한 조치와 대응이 필요하다. 환경부에서는 유해화학물질 유출사고로 인한 국민건강 및 환경상의 위해를 예방하기 위해 화학물질관리법과 화학물질 등록 및 평가에 관한 법률을 제정하여 유해화학물질을 관리하고 사고에 대응하고 있다. 그러나, 화학사고 발생 시 현장인력에 의존해 공장 인근의 먼지, 악취 등을 감시하거나 화학물질의 유출이 우려되는 곳에 제한적으로 검출센서를 설치해 사고를 감시하고 있으나 미설치 지역에 대한 능동적 탐지가 어렵고, 공간적 분포 탐지가 불가능하여 초동 대응에 한계가 있다. 한편 최근 초분광 영상을 활용하여 물질 고유의 특성을 분석함으로써 토지피복, 식생, 수질 등의 식별에 활용되고 있어 화학물질 감지 가능성도 보여주고 있다. 하지만, 초분광 센서를 활용한 하천의 화학물질 감지를 위한 연구는 아직 미비한 실정이다. 이에 본 연구에서는 우선 유해화학물질의 일종인 황산, 염화티오닐, 톨루엔을 대상으로 지점 분광복사계로 촬영하여 각각의 화학물질이 갖는 분광특성을 수집하여 초분광 영상으로 상호 구분이 가능한 지 확인하고자 하였다. 이상치 검출 및 신뢰도 높은 자료를 구축하기 위해 다회 반복촬영하였으며 반사도의 표준화를 위해 백색판을 동시에 측정하고 이를 정규화하여 분광 라이브러리를 구축한 결과, 대상 화학물질 별 식별이 가능하다는 결과를 도출하였다. 이러한 가능성에 기반하여 추가적인 유해화학물질 분광 라이브러리 데이터베이스를 구축하면, 사고물질의 식별 및 농도를 즉각적으로 확인하고 실시간 모니터링에 적용하여 신속하게 화학사고 발생여부 감지 및 대응에 활용될 것으로 기대한다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.6
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• pp.218-225
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• 2021

The purpose of this study is to present a rational analytical method for predicting the behavioral characteristics from crack occurrence to fracture for a one-way CFRP grid reinforced concrete slab specimen. A total of four specimens were selected by Zhang et al.(2004) as the main experimental variables for CFRP grid amount, material properties and loading method. Analysis was performed through the Nonlinear Finite Element analysis program(RCAHEST), which applied the newly modified constitutive relational equations by the author. The mean and coefficient of variation for maximum moment from the experiment and analysis results was predicted 1.38 and 7 %. The mean and coefficient of variation for displacement corresponding maximum moment from the experiment and analysis results was predicted 1.41and 9.8 %. The prediction results for the behavioral characteristics from crack occurrence to fracture were verified and evaluated. It is judged that additional research is needed to secure various experimental results and to develop a more reliable analytical method.

• Journal of the Society of Disaster Information
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• v.17 no.3
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• pp.556-567
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• 2021

Purpose: In this study, various methods of deep learning-based automatic damage analysis technology were reviewed based on images taken through Unmanned Aerial Vehicle to more efficiently and reliably inspect the exterior inspection and inspection of railway bridges using Unmanned Aerial Vehicle. Method: A deep learning analysis model was created by defining damage items based on the acquired images and extracting deep learning data. In addition, the model that learned the damage images for cracks, concrete and paint scaling·spalling, leakage, and Reinforcement exposure among damage of railway bridges was applied and tested with the results of automatic damage analysis. Result: As a result of the analysis, a method with an average detection recall of 95% or more was confirmed. This analysis technology enables more objective and accurate damage detection compared to the existing visual inspection results. Conclusion: through the developed technology in this study, it is expected that it will be possible to analysis more accurate results, shorter time and reduce costs by using the automatic damage analysis technology using Unmanned Aerial Vehicle in railway maintenance.

• International Area Studies Review
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• v.21 no.2
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• pp.171-196
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• 2017

This study employed the Analytical Hierarchy Process (AHP) methodology with the enhancement of the competitiveness of Vietnamese commercial banks set as the overall goal of the model. Analysis of the survey questionnaire based on pair-wise comparisons and collected from experts in the field of banking led to three significant findings. First, banking safety is the most important evaluation criteria for the competitiveness of local commercial banks in Vietnam, followed by operating efficiency, intangible values and large scale. Second, in order to achieve the overall goal of enhancing competitiveness for local banks, securing healthy financial conditions should be made the priority. Effective management systems, strategic human resource planning and high-quality products and services all show strong connections to achieving the evaluation criteria. Third, the study found that bad debt settlement is essential in obtaining healthy financial conditions. In order to introduce effective management systems as well as high-quality products and services, technological advances are very important. Improving the quality of executives and staff is imperative for strategic human resource planning purposes.

• Journal of Internet Computing and Services
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• v.23 no.3
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• pp.137-145
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• 2022

The logistics of ammunition stored in the underground ammunition warehouse has more difficulties than the logistics of ammunition stored on the ground due to the nature of the storage space. This study was conducted to solve the logistics of underground ammunition warehouse by improving these problems. And six items such as guard, safety, environment, supply system, equipment, facilities, and life management were selected for the improvement of logistics. And AHP was analyzed by Expert Choice program by conducting a survey to experts. As a result of the analysis, it was confirmed that the importance was high in the order of safety, guard, life management, equipment facilities, supply system, and environment. Based on the selected items and the results of the survey, a plan to build a network-based integrated platform that can improve logistics in an underground ammunition warehouse was presented. This study will be used as a basis for the establishment of an integrated platform when constructing an underground ammunition warehouse in the future. This study can be applied to storage facilities that store other materials in the military, and it is expected to be applied to large commercial storage facilities.

• Journal of Korea Society of Industrial Information Systems
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• v.27 no.4
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• pp.65-79
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• 2022

This study identified smart manufacturing technologies using patent and topic modeling, and compared the technology development trends in countries such as the United States, Japan, Germany, China, and South Korea. To this purpose, this study collected patents in the United States and Europe between 1991 and 2020, processed patent abstracts, and identified topics by applying latent Dirichlet allocation model to the data. As a result, technologies related to smart manufacturing are divided into seven categories. At a global level, it was found that the proportion of patents in 'data processing system' and 'thermal/fluid management' technologies is increasing. Considering the fact that South Korea has relative competitiveness in thermal/fluid management technologies related to smart manufacturing, it would be a successful strategy for South Korea to promote smart manufacturing in heavy and chemical industry. This study is significant in that it overcomes the limitations of quantitative technology level evaluation proposed a new methodology that applies text mining.

• Journal of the Korean Association of Geographic Information Studies
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• v.26 no.4
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• pp.200-217
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• 2023

The purpose of this study is to analyze the urban spatial network of Busan in a time-series manner to examine the planning role of centeral area change and spatial management. The analysis method used the ASA(Angular Segment Analysis) technique of the space syntax theory, and the analysis period was divided into three periods from 1937 to 2022, when the Busan urban planning was established. As the result, the center area formed in Nampo-dong and Gwangbok-dong were differentiated and moved to Seomyeon, and then the process of redifferentiated into Yeonsan was confirmed in Seomyeon. It is also room for the center area to move to the western region in the future, and it was possible to identify the center area formed by the policy-set and amenity elements. In addition, we examined the system of urban spatial structure through the intelligibility analysis of space syntax theory, and found that the qualitative interpretation of existing studies and the interpretation from the perspective of space syntax theory were consistent with each other. Through this, it was possible to confirm that the role of the plan for space management.

• Journal of the Korea institute for structural maintenance and inspection
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• v.10 no.1
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• pp.165-172
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• 2006

A variety of techniques for strengthening have been developed, including pate bonding, external prestressing and overslabbing. Expecially, a strengthening technique for reinforced concrete beams using external unbonded reinforcement offers advantages in speed and simplicity of installation. The purpose of this paper is to investigate the capabilities of a new retrofitting technique, namely external prestressing(out-cable), for flexural strengthening of beams. Results of 2 physical tests (external Post-tension and out-cable system specimen) on strengthened reinforced concrete continuous beams are reported and compared. It is shown that the out-cable system can provide strength enhancement.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.05a
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• pp.414-417
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• 2003

유역의 경사가 비교적 급하고, 소규모 축산농가의 미처리된 축산폐수 및 농경지 배수, 산재된 마을하수 등 비점오염원의 유출이 강우시 집중적으로 이루어지는 중산간 농업용 저수지의 수질개선을 위한 공법으로 부영양화된 충남 아산 마산저수지의 유입부에 조성한 저류지를 이용한 수질개선효과 및 물질분해자로서 미생물학적 특성을 2000년부터 2002년까지 3년간 연구함으로서 향후 유사한 농업용저수지의 수질개선 방안으로 실용화 가능성을 모색하고자 하였다. 그 결과 수질정화효과는 총질소와 총인 등 영양염류의 정화효과가 비교적 우수하게 나타났으며, 유기오염물질로서 BOD, COD, SS 등은 평균 수질정화효과는 (-)의 값을 보여주었으나, 강우기에는 정화효율이 높게 나타났다 또한, 저류지의 물질 침전기능 외 오염물질의 활발한 분해작용을 살펴보고자 세균 분포 특성을 조사한 결과 유입수와 저류지, 저수지 각각의 수체에서 조사된 총세균수 및 총세균수에 대한 진정세균수의 비율이 유입수<저류지<유출수의 순으로 나타나 저류지의 유기물질 분해 활성이 높음을 보여주고 있다. 따라서 저수지 유입부에 조성한 저류지의 수질개선효과는 강우시 입자성 유기물질의 효과적 제거 뿐만아니라 영양염류의 제거효과, 특히 질소의 제거효과가 높은 정화기구로서 설치비용이 적고, 유지관리가 간단한 특성을 살려 유사한 중규모 농업용저수지의 수질개선 기법으로 널리 활용할 가치가 있음으로 사료된다.

• Proceedings of The Korean Society of Health Promotion Conference
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• 2009.05a
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• pp.83-83
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• 2009

본 연구는 한국인 노년층이 대표적으로 섭취하는 강도별 음식을 조사하고 각 음식별로 씹어 먹을 수 있는 음식들이 무엇인지를 조사하여 자신이 보유하고 있는 자연치아수와의 상관관계를 알아보아 자연치아의 건강도를 유지, 관리, 예방하는데 하나의 지표로 사용하고 더 나아가 국민구강건강향상에 이바지 하고자 실시되었다. 전국의 60세 남 녀 586명을 대상으로 치과의사와 치과위생사가 구강검사와 면접법으로 설문내용을 기록하는 방식으로 진행하였다. 수집된 자료는 SPSS WIN 14.0 프로그램을 이용하여 분석하였다. 분석기법으로는 잔존치아수와 저작능력간의 관계를 상관계수와 회귀분석으로 분석 검증을 실시하여 다음과 같은 결과를 얻었다. 1. 저작능력과 구강상태와는 치석, 동요도, 충전점수, 우식경험점수, 발거치아수, 임플란트 수, 자연치아수와 나이, 고혈압, 당뇨병, 기타질환, 흡연이 유의한 것으로 나타났다(p<0.05). 2. 회귀분석 결과 나이가 높을수록 저작능력이 감소하며, 자연치아수가 많을수록 저작능력이 높은 것으로 나타났으며 회귀방정식은 저작능력=79.417-(연령$\times$0.281)+3.813$\times$치아수와 같았다(p<0.05). 3. 회귀분석결과 저작능력점수와 자연치아수와의 관계가 가장 높은 것으로 나타났고 회귀방정식은 저작능력=3.817$\times$자연치아+58.694와 같았다(p<0.05). 4. 자연치아로 식사를 하기 위해서는 한국 노인의 주식인 밥과 김치정도를 잘 씹어 먹으려면 잔존 자연치아수가 18개 정도는 있어야 아주 잘 씹어 먹을 수 있고, 잘 먹으려면 12개의 자연치아가 있어야 하며, 육류를 잘 먹기 위해서는 최소한 18개는 있어야 잘 먹을 수 있고, 25개가 있으면 아주 잘 씹어 먹을 수 있다는 연구결과가 나왔다.