• Nuclear industry
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• v.37 no.1
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• pp.7-14
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• 2017

작년 경주 지진으로 원자력 안전에 대한 시민들의 촉각이 예민해져 있는 가운데 최근 대전 지역에서 원자력연구원의 하나로 원자로 건물 외벽 내진 보강 공사 방식에 대한 검증을 요구하는 여론이 일고 있다. 그 동안 원자력연구원에서 진행한 하나로 건물 내진 보강 공사 배경과 주요 일정, 설계 개념, 구조 성능 검증 실험, 공사 현황, 건물 성능 점검, 안전 관리, 정보 공개 및 검증, 향후 계획 등을 정리하여 종합했다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.5
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• pp.161-170
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• 2022

The maintenance of bridges installed in rivers is carried out through facility safety inspection and repair & reinforcement procedures according to the results. Many studies have been so far conducted on the safety check of the bridge upperstructure because of the ease of access. However as it is impossible to directly investigate whether the pier foundation installed in the river has been scoured. Management of underwater foundations has remained based on theory. In this study, the scour of the bridge foundation installed in such a river was realized in 3D form by using an echo sounder and VRS. This made it possible to predict the scour pattern through comparison and analysis with the ground height of the riverbed at the time of the bridge installation. Based on these results, if the pier foundation is used as an initial data to determine whether or not local scour is present and to predict long-term scouring, bridge collapse due to foundation scour can be prevented.

• Journal of the Society of Disaster Information
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• v.17 no.3
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• pp.608-616
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• 2021

Purpose: Safety inspections by existing personnel have been limited in evaluation and data securing due to concerns about the safety of technicians or difficulty in accessing them, and are becoming a bigger problem as the number of maintenance targets increases due to the aging of facilities. As drone technology develops, it is possible to ensure the safety of personnel, secure visual data, and diagnose quickly, and use it is increasing as safety inspection of facilities by drones was introduced recently. In order to further enhance utilization, it is considered necessary to base a consideration standard for facility appearance investigation by drones, and in this paper, research was conducted on dams. Method: To calculate the quality, existing domestic safety inspection and drone-related consideration standards were investigated, and procedures related to safety inspection using drones were compared and analyzed to review work procedures and construction types. In addition, empirical data were collected through drone photography and elevation image production for the actual dam. Result: Work types for safety inspection of facilities using drones were derived, and empirical survey results were collected for two dams according to work types. The existing guidelines were applied for the adjustment ratios for each structural type and standard of the facility, and if a meteorological reference point survey was necessary, the unmanned aerial vehicle survey of the construction work standard was applied. Conclusion: The finer the GSD in appearance investigation using drones, the greater the number of photographs taken, and the concept of adjustment cost was applied as a correction to calculate the consideration standard. In addition, it was found that the problem of maximum GSD indicating limitations should be considered in order to maintain the safe distance.

• Magazine of the Korea Institute for Structural Maintenance and Inspection
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• v.18 no.3
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• pp.100-104
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• 2014

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.36-43
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• 2021

Because bridges are major national infrastructure, regular safety inspections or diagnoses for bridges have been conducted in accordance with the "Special Act on the Safety and Maintenance of Facilities." Accordingly, the condition and safety assessments of the bridge are conducted to derive the condition and safety rating, respectively. A lower result is determined to be the safety grade of the bridge. In this study, the relationship between the condition rating and safety rating, which are the core of the bridge safety grade, was analyzed by the representative superstructure types of bridges, such as RC slab, PSCI girder, Steel box girder, Rhamen, and Preflex girder, to identify the correlation status and range between each rating. A reasonable improvement direction for establishing existing maintenance policies was suggested by proposing an alternative plan to change the proper implementation cycle of the inspection and diagnosis of bridge superstructure types. As a result of the research, it is necessary to adjust the inspection and diagnosis cycle according to the superstructure type and safety grade. In addition, maintenance policies need to be improved through detailed research on more diverse bridge types in the future.

• Journal of the Korea institute for structural maintenance and inspection
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• v.27 no.5
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• pp.67-74
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• 2023

A large number of concrete structures are built and used around the world. To ensure their safe and continuous use, these structures require constant inspection and maintenance. While man-powered inspection and maintenance techniques are efficient, they can only provide intermittent status checks at the time of on-site inspection. Therefore, there is a growing need for a system that can continuously monitor the condition of the structure. A study was conducted to detect cracks and damage by installing a conductive coating on the surface of a concrete structure. A parallel resistance pattern that can monitor the occurrence and progression of cracks was developed by reflecting the structural characteristics of concrete structure. An empirical study was conducted to veryfy the application of the proposed method. The crack detection pattern was installed on the reinforced concrete beams, and the crack monitoring method was verified through applying a load on the beams.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.6
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• pp.121-130
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• 2021

Recently, the need for new approaches and recognition of safety and maintenance has been raised for small vulnerable facilities in Korea due to the acceleration of aging facilities, various safety accidents, and increased frequency of use. In particular, small vulnerable facilities(SVF), including most social welfare facilities, are facilities used by many of the vulnerable groups, and safety management is very important. Therefore, this study investigated various statuses based on safety inspection results (31,114 cases) conducted over the past 13 years (2008-2020) for small vulnerable facilities in Korea, and evaluated the characteristics of each field and safety and maintenance performance level. This aims to present policy directions for strengthening safety management of facilities for the vulnerable by using basic data such as improvement of safety standards and maintenance strategies for small vulnerable facilities in Korea in the future.

• Journal of Korean Society of Disaster and Security
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• v.16 no.4
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• pp.123-128
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• 2023

This paper presents the results of an analysis of the discrimination accuracy of a bridge load carrying capacity estimation model based on data from inspection reports. The load carrying rate estimation model was derived using statistical methods through the collection of 2,161 inspection reports. By entering the bridge specifications and maintenance information, you can check the estimated load carrying capacity of the bridge. In order to verify the discrimination accuracy of the estimated load carrying rate model, the estimated load carrying rate was compared with the load carrying rate in the inspection and diagnosis report for 164 public bridges for which data was available. Although there are differences depending on the bridge type, the results were obtained with an accuracy of over 80% in determining the estimated load carrying capacity.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2002.10a
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• pp.445-452
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• 2002

토목 및 건축구조물에 대한 합리적이고 정확한 설계, 시공은 물론 구조물 시공후의 안전 점검, 보수ㆍ보강 등을 위한 계측은 구조물의 사용성을 항상 최적의 상태로 유지하고 구조물의 공용수명을 연장시키는데 있어 매우 중요하다. 일반적으로 사용단계의 구조물은 시간이 경과함에 따라 초기의 설계, 시공상 오류에 의한 초기결함, 반복하중 그리고 취약한 환경 등 외부 조건에 노출될 경우에는 구조물 본연의 성능을 점차 상실하게 되어 심지어는 인명과 재산권을 위협하는 대형 붕괴사고를 일으키기도 한다. (중략)

• Information and Communications Magazine
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• v.34 no.3
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• pp.47-55
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• 2017

오늘날 스마트폰 앱을 통해 다양한 핀테크 서비스를 이용할 수 있게 되었고, 안전한 금융거래를 위하여 앱 보안은 반드시 고려되어야 하는 상황이다. 따라서 본 고에서는 안드로이드 환경에서 핀테크 서비스를 제공하는 앱의 보안을 점검하기 위하여 안드로이드 앱의 구조를 소개하고, 디컴파일 도구를 이용한 정적 분석 방법과 디버깅, 네트워크 패킷 분석과 같은 동적분석 방법을 제공하고자 한다.