• Proceedings of the Korean Nuclear Society Conference
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• 1995.05b
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• pp.937-941
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• 1995

한국원자력연구소는, 지금까지 연구로 1호(250 ㎾)는 33년째, 연구로 2호(2 ㎿)는 23년째 운전하고 있다 그러나 이들 연구로는 노후하였고, 새로운 연구로 하나로(30 ㎿)가 금년 4월에 준공하였으며, 현재의 연구로 1, 2호가 있는 부지와 건물은 한국전력공사의 소유물이라는 이유로, 금년 말까지 연구로 1, 2호는 폐로할 계획으로 있다 이 논문에는 연구로 1,2호기에 대한 1)폐로 계획의 배경, 2)연구로의 이력, 3)폐로 계획 등을 기술하고 있다.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.440-442
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• 2008

한국전력공사는 강진변전소에 FACTS 설비인 80MVA UPFC를 (주)효성과 공동으로 개발하여 2003. 5월 준공하였다. 강진 UPFC는 40MVA 병렬인버터와 40MVA 직렬인버터로 구성되어 있으며, 대용량 인버터 핵심기술은 지멘스와의 기술제휴로 개발되었다. 한국전력공사는 UPFC 운영을 통하여 확보된 기술을 기반으로 제어기술을 국산화하고 있으며, 현재 유지보수용으로 GTO 밸브 시험 장비를 개발하였다. 본 설비는 기존 수작업에 의한 GTO 밸브의 건전성 시험을 자동화하고, 자료를 체계적으로 이력 관리함으로써, UPFC 설비의 신뢰성 향상에 도움을 줄 것으로 기대된다.

• The Journal of the Convergence on Culture Technology
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• v.5 no.1
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• pp.389-394
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• 2019

In case of damaged timber sleepers, maintenance is carried out according to the track inspection standard. However, it is difficult to detect the extent of damage on the bridge, and maintenance is depended on inspector's judgment. In this study, we propose to improve the evaluation criterion of timber sleepers for the ballast-less tracks on serviced urban railway bridge. The timber sleepers on railway bridge was classified according to degree of damage, and damage scores were calculated for each damage grade. Also we have improved the maintenance system of the timber sleepers through the history management system of the individual timber sleepers on railway bridge. As a results, it was judged that systematic management of timber sleepers could be possible during maintenance.

• Land and Housing Review
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• v.3 no.4
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• pp.407-413
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• 2012

In this study, the possibility of applying the damping devices to shear-wall dominant apartment buildings(SDA) was examined. In order to achieve research objectives, ASCE/SEI 7-10 design procedure for structures with damping systems applied to four representative apartment buildings which are under design or previously designed with the shear-wall dominant system, and the performances of damping devices were investigated. It is shown that in order to secure the seismic performance of SDA by using dampers, the stiffness of the dampers should be very large because of the effects of shear walls with the high elastic stiffness. But since this large stiffness is highly difficult to implement in reality, prudent decisions have to be made in designing the SDA with damping system and friction dampers with the high initial stiffness are more effective than hysteretic steel dampers.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.5
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• pp.391-395
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• 2008

KEPCO 80MVA UPFC has been operated in Gangjin Substation since May 2003. This UPFC is composed of 40MVA shunt inverter and 40MVA series inverter, and developed in technical cooperation between Hyosung and Siemens. KEPCO has tried to localize UPFC control technique after its installation and developed GTO Thyristor Valve Test Equipment for annual maintenance test. The development of this equipment make it possible to process GTO Thyristor module test automatically and manage historic data systematically, which could improve UPFC reliability.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.268-269
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• 2017

Apartment building, which has been accompanied by economic growth in Korea, is a home of life and has the value overlapping as housing and assets. The improvement of consumer's eye level and development of related technology and related service development have positive function that enriches society and creates economic wealth. On the other hand, the clash and conflict between stakeholders increase social unrest and waste our competitiveness by economic loss. The term of warranty liability of apartment building is an important issue of defect lawsuits and is only a few quantitative standards. However, in this study, we examined the revision history of the law and ordinances for the reinforced concrete construction. As a result, establishing and revising the relevant standard, there is no definite basis system to support it. To improve this, the efforts to provide the standard for term of warranty liability and quantitative and objective basis to support it should be accompanied continuously.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.11
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• pp.208-216
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• 2019

Construction projects generate a massive amount of diverse information. It takes at least five years to more than 10 years to complete, so it is important to manage the information on a project's history, including processes and costs. Furthermore, it is necessary to determine if construction projects have been carried out according to the planned goals, and to convert a construction information management system (CALS) into a virtuous cycle. It is easy to ensure integrated information management in private construction projects because constructors can take care of the whole process (from planning to completion), whereas it is difficult for public construction projects because various agencies are involved in the projects. A CALS manages the project information of public road construction, but that information is managed according to CALS subsystems, resulting in disconnected information among the subsystems, and making it impossible to monitor integrated information. Thus, this study proposes integrated information management measures to ensure comprehensive management of the information generated during the construction life cycle. To that end, a CALS is improved by standardizing and integrating the system database, integrating the individually managed user information, and connecting the system with the Dbrain tool, which collectively builds artificial intelligence, to ensure information management based on the project budget.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.358-361
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• 2004

The objective of establishing IETM (Interactive Electronic Technical Manual) is not the just making into on-1 me system of technical manuals such as specifications. It is to produce construction standard documents in an electronic manual system to turn technical contents such as construction methods in technical manuals into multimedia information. Also, it is to maximize real-time information delivery by using visual data of construction sites. IETM enables to check not only design standards in the design but also applied situation of a construction method based on proper design standards and historical construction data on a real time basis. This study suggests a modeling method of IETM applicable to design and construction phase. The study includes a framework and a scenario for developing design IETM for construction project.

• Journal of the Korea Institute of Building Construction
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• v.24 no.1
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• pp.157-168
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• 2024

The frequent occurrence of structural failures at building construction sites in Korea has underscored the critical role of rigorous oversight in the inspection and management of construction projects. As mandated by prevailing regulations and standards, onsite supervision by designated supervisors encompasses thorough documentation of construction quality, material standards, and the history of any reconstructions, among other factors. These reports, predominantly consisting of unstructured data, constitute approximately 80% of the data amassed at construction sites and serve as a comprehensive repository of quality-related information. This research introduces the SL-QPA model, which employs text mining techniques to preprocess supervision reports and establish a sentiment dictionary, thereby enabling the quantification of quality performance. The study's findings, demonstrating a statistically significant Pearson correlation between the quality performance scores derived from the SL-QPA model and various legally defined indicators, were substantiated through a one-way analysis of variance of the correlation coefficients. The SL-QPA model, as developed in this study, offers a supplementary approach to evaluating the quality performance of building construction projects. It holds the promise of enhancing quality inspection and management practices by harnessing the wealth of unstructured data generated throughout the lifecycle of construction projects.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.777-785
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• 2021

Many utility lines are buried underground to provide various functions of the city. Because historical records are not managed systematically, damage has occurred during excavation. In addition, the demand for an underground facility management system is increasing as the aerial underground project is progressing. By attaching an electronic recognition sensor to an underground facility, such as pipelines, the management history and site conditions can be carefully managed. Therefore, in this study, electronic recognition sensors, such as BLE Beacon, UHF RFID, geomagnetic sensor, and commercial marker, were tested to analyze the strengths, weaknesses, and field applicability through a pilot project. According to the limited research results collected through two pilot projects, the installation depth is most important to demonstrate the performance of the electronic reader. In addition, because it should be used in urban areas, the influence of environmental interference should be minimized, and there should be no performance degradation over time. In the case of the geomagnetic recognizer, the effect of environmental interference was large, and performance degradation occurred over time using the BLE Beacon. In the field situation, where the installation depth can be controlled to less than 40cm, the utility of the battery-free UHF RFID was the best.