• Journal of Korean Society of Disaster and Security
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• v.16 no.4
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• pp.147-156
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• 2023

Because the behavior of cable bridges is dominated by dynamic response and is relatively complex, short- and long-term field monitoring are often required to evaluate the bridge condition. If a permanent SHMS (Structural Health Monitoring System) is not installed, a portable monitoring system is needed for the checking of bridge condition. In this case, it can be difficult to operate the portable monitoring system due to limited conditions such as power and communication according to the location and type of the bridge. In this study, the portable-based smart structural response monitoring system is developed that can be effectively used for short- and long-term monitoring of cable bridges in Korea and Southeast Asia. The developed system is a multi-channel portable data acquisition and analyzer that can be operated for a long time in the field using its own power supply system, and is included with the automated analysis algorithm for the dynamic characteristics of cable bridges using real-time data. In order to evaluate the field applicability of the developed system, field demonstration was conducted on cable bridges in Korea and Vietnam. Through the demonstration, the reliability and efficiency of field operation of the developed system were confirmed, and additionally, the possibility of application to overseas markets was confirmed in cable bridge monitoring field.

• Land and Housing Review
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• v.15 no.2
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• pp.125-137
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• 2024

A conventional Design for Safety (DfS), introduced to eliminate potential hazards in the design phase proactively, has encountered persistent challenges, such as perfunctory risk assessments and hazard identifications based on 2D drawings and inefficient workflow processes. This study proposes a BIM-based approach to Design for Safety (DfS) to address the limitations of conventional methods, aiming to enhance efficiency and achieve practical safety management benefits. The proposed workflow process for BIM-based DfS has been refined and validated for on-site applicability through various case studies, including risk assessments during the design phase and field applications for safety management activities during the construction phase. Specifically, the critical process of risk assessment within the DfS methodology has also been transitioned to a BIM-based approach. This BIM-based risk assessment process has been evaluated through case studies, encompassing safety reviews for structural design, construction equipment operation, and construction methodology with sequence in design projects. Additionally, the proposed BIM-based DfS has demonstrated exceptional on-site applicability and efficiency, as validated by the application of a BIM deliverable embedded in DfS information for CDE-based daily activity briefing, VR-based safety training, AR-based mitigation measures inspections, and other safety management activities in the construction phase.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.1
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• pp.1-8
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• 2006

Effective three dimensional modeling becomes essential in a wide range of drawings, such as construction, machinery and design. In particular, it has been developed as the tool enabling reverse design. Three dimensional modeling requires rapidity, accuracy and tangibility. Data acquisition methods for modeling including contact type coordinate measurement machine, LASER scanner, pattern scanner and digital photogrammetry. In this study, we try to analyze modeling techniques as well as introduce three dimensional modeling using pattern scanner. In addition, this study conducts three dimensional modeling using OPTO-Top pattern scanner with distinguished accuracy and rapidity, and then compare efficiency with digital photogrammetry. And, this study attempts to form environment that enables to turn around models on web in three dimensional ways.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2464-2472
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• 2011

Train runs on high speed and the concrete track is constructed. Rail fastening device needs to reduce elasticity, transferred load, noise, and vibration etc. Consequently, low elastic pad has a great impact of the durability and stability of the track. In this study, discussed in previous studies, static numerical analysis and real scale repeated loading test, followed by dynamic response analysis were implemented. The most distinctive characteristics of the model proposed is to simulate the real wheel behavior on rail. And the main analysis object is to evaluate and compare the deformation characteristics of the transition track while load reduction effect of transfer on roadbed assessed by various low elastic pad.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.2A
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• pp.51-58
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• 2011

The objective of this research aims at improving the structural and economical efficiency of small and medium-span reinforced concrete bridge slab with the Inverted-T girders (hereinafter, called as IT). This IT method has an advantage over minimizing the construction process which could cause environmental pollution and traffic congestion. Especially it is thought that this new composite bridge slab with IT girders has better aesthetic view and visibility than existing old bridges, and is also a good methodology to solve labor shortage problems due to coming aging society. Therefore, this IT method should be one of very effective construction technologies to improve the constructibility and to reduce the construction cost.

• 월간 기계설비
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• s.232
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• pp.50-70
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• 2009

T.A.B란 공기조화설비에 대한 종합시험조정으로 시험, 조정 및 균형(Testing, Adjusting & Balancing)이라는 뜻이다. 이는 설계 목적에 부합되도록 모든 빌딩의 환경시스템을 검토하고, 조정하는 과정이다. 따라서 T.A.B기술은 공기 및 물이라는 유체의 흐름과 온 습도에 관련된 분야이기 때문에 시각적으로 그 성과를 알아보기 힘들고, T.A.B를 적용한 후 결과치를 정밀 분석해 판단할 수 있으며 T.A.B기술을 적용하지 않은 건물과 간접비교하는 방법으로 그 효과를 쉽게 알 수 있다. T.A.B기술을 적용할 경우 시공 중인 건물에 설계도서가 완료되기 전, 또는 장비의 구매발주 전에 T.A.B측면에서 모든 기술 도서를 면밀히 검토하게 된다. 그 중 일부에서 발견되는 문제점들 즉, 적정치 못한 용량 선정, 시스템 구성상 미비점, 불필요한 장비 선정, 누락 사항을 발견할 수 있다. 따라서 T.A.B 기술을 적용할 경우 향상된 품질의 시공이 가능해 준공 후 빈번히 대두되는 하자 문제가 현격히 줄게 되며 또한 운전경비 절감, 쾌적한 실내환경 조성, 장비수명 연장 등 효율적인 운전관리 효과를 얻을 수 있다. 우리나라 공기조화설비기술은 꾸준한 발전을 이루었고, 최근에는 도입 초기단계시 전혀 고려되지 않던 공조공간의 쾌적성 및 소음 방지 대책 등의 문제가 주요사항으로 부각되고 있다. 이에 따라 공조설비에 T.A.B실행의 표준화 정착과정에 있으며, 국내 학계 및 연구기관에서 공조설비에 대한 연구 및 T.A.B용역업체의 기술축적 등 T.A.B분야 발전을 위해 노력하고 있다. 본지는 T.A.B의 수행절차 및 수행계획, TAB 수행업체 등에 대해 알아본다.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1300-1304
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• 2006

최근 침투형 우수유출저감시설은 물 순환 및 초기우수관리 문제, 치수 목적으로 사용이 증대되고 있으며, 시설 확대를 위한 관련 법규나 기준이 강화되고 있는 실정이다. 본 연구에서는 호우사상에 대한 침투통의 저감효과를 분석하여 우수유출저감시설로써 적용성과 치수효과를 검증하는데 그 목적이 있으며, 연구방법으로는 실제 호우사상에 대해 침투통의 현장계측을 이용하여 유출 저감율을 측정하고, 수문해석에 의해 저감효과를 분석하였다. 현장계측을 실시한 전주지역의 2005년 8월 2일 호우사상은 290.5mm를 나타냈으며, 이 강우량은 $\ulcorner$한국확률강우량도(한국건설기술연구원, 2000)$\lrcorner$에 의한 전주관측소 50년 빈도 24시간 확률강우량 287.7mm를 초과하는 값으로 분석되었다. 이 때, 총유출저감율은 약 56%로 측정되었으며, 유역특성이 비슷한 지역에서는 해당 강우량에 대해 유사한 저감효과를 나타낼 것으로 판단된다. HEC-HMS와 단위침투설계법을 이용하여 수문해석을 실시하였으며, 동일한 호우사상 자료를 적용한 결과, 총유출저감량은 20.64%, 최대 첨두유량은 6%의 저감율을 나타냈다. 향후 지속적인 모니터링과 첨두유량에 대한 연구가 보완되고 호우사상에 대한 계측자료가 추가로 확보된다면 호우사상에 대한 침투통의 치수효과를 정량화할 수 있을 것으로 판단된다.

• The Journal of Information Technology
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• v.3 no.4
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• pp.55-72
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• 2000

The International Standby Practices (ISP98) has been carefully crafted for use with standby letters of credit. ISP98 is expected to become widely used for standby letters of credit commencing January 1, 1999. These new practices have been ratified and jointly published by the International Chamber of Commerce- the same organization that Provided us with the Uniform Customs and Practices for Documentary Credits, UCP500. The intention behind drafting ISP98 was to consolidate common and accepted practices applying to Standby Letters of Credit and to set a worldwide standard. ISP98 gives issuing organizations a set of practices that are free from the anomalies that arise when UCP500 is applied to Standby Letters of Credit This paper focuses on ISP98 provisions that may lead to changes in forms of standby letters of credit and reimbursement agreements, that may lead to changes in standby practices, that may alert parties to issues they had not previously focused upon, or that parties may wish to limit or vary, This Paper also focuses on differences between ISP98 and the Uniform Customs and Practice for Documentary Credits, 1993 revision, ICC Publication No. 500(UCP 500).

• Journal of the Korean Institute of Gas
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• v.10 no.4 s.33
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• pp.47-51
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• 2006

Safety issues for LNG(Liquified Natural Gas) terminal or LNG tank involve various concerns such as production/transportation at cryogenic temperature of $-160^{\circ}C$, large volume of handling, flammability and explosion risk. Hence, in designing an LNG terminal rigid safety criteria and mandatory requirements are unavoidable. Since known cases of LNG related accident are very few, careful study and root cause analysis of them are very important and provide precious information to increase safety level of the LNG terminal. In this paper most key accident cases were gathered and analysed to understand fundamental safety issues of LNG terminal to prevent further accident.

• Journal of the Korean Society of Safety
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• v.29 no.6
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• pp.94-98
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• 2014

This study was intend to develop the optimal design method of suspension bridge by the reliability analysis based on minimization of life cycle cost(LCC). The reliability analysis was performed considering aleatory uncertainties included in the result of numerical analysis. The optimal design was estimated based on life-cycle cost analysis depending on the result of reliability analysis. As the effect of epistemic uncertainty, the safety index (beta), failure probability (pf) and minimum life cycle cost were random variables. The high-level distributions were generated, from which the critical percentile values were obtained for a conservative bridge design through sensitivity assessment.