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권용규(Kwon, Yong Kyu),김정현(Kim, Jeong Hyun),이지선(Lee, Jisun),권재현(Kwon, Jay Hyoun) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11
현재 측량장비 및 기술의 발달에 따라 작업규정의 개정이 진행되었다. 하지만 경사지 수준 측량 시 해당 작업규정을 적용하기에는 관측환경에 의한 한계가 존재하며 이는 왕복교차에 영향을 줄 수 있다. 이에 본 연구에서는 현재 도입되어 사용 중인 주요 디지털레벨을 조건별로 비교하여 경사지에서 최적의 수준측량 방법을 제시하고자 하였고, 그 결과 수준측량수행 시 고정점 설치를 최소화하는 경우 구간교차한계 및 전체오차한계 기준을 통과하는 결과를 확인할 수 있었다.
변동하중을 받는 Glass/Epoxy 복합재료의 피로수명 예측
권용규(Yong-Kyu Kwon),강기원(Ki-Weon Kang),김정규(Jung-Kyu Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
This paper presents the fatigue behavior of composite materials with impact-induced damage under constant amplitude and random loading. For this purpose, the fatigue tests under constant amplitude and random loading were performed on the impacted composite materials. The fatigue life of the impacted materials under the constant amplitude loading can be identified through the prediction model, based on the fatigue characteristics of virgin materials and residual strength due to impact damage. Also, the model for equivalent stress is proposed to estimated the fatigue life under random loading, based on the S-N curves under constant amplitude loading. The equivalent stress and corresponding fatigue life by the present model agrees well with the experimental results.
원전해체 시 콘크리트 구조물 절단을 위한 밀기형 절단장치 개발
이봉재,권용규,홍창동,이동원,민경남,Lee, Bong-Jae,Kwon, Yong-Kyu,Hong, Chang-Dong,Lee, Dong-Won,Min, Kyong-Nam 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.1
Pulling-type cutting devices, which use a diamond wire saw, have been used generally for cutting concrete structures. In this study, a pushing-type cutting device with a collection cover was developed by overcoming the disadvantages of pulling-type devices. In this device, dry or liquid methods can be selected to cool frictional heat. Operation and leakage tests of the dust generated during the dismantling of a concrete structure were carried out, confirming the suitable operation of the fabricated cutting device; the leakage rate was approximately 1.7%. For a conservative evaluation, the internal dose of workers was estimated in dismantling the core center part of biological shield concrete with a specific activity of 99.5 Bq·g<sup>-1</sup>. The committed effective dose per worker was 0.25 mSv. The developed cutting device contributed to reducing radioactive concrete waste and minimizing worker exposure due to its easy installation. Therefore, it can be utilized as a cutting apparatus for dismantling not only reinforced concrete structures but also radioactive biological shield concrete in nuclear power plant decommissioning efforts.