http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
구자석(J.S. Koo),이연규(Y.G Lee),최재석(J.S. Choi),주동국(D.G. Choo),신소영(S.Y.Shin),이태희(T.H. Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An automated system for the structural analysis of chassis module are developed. The system can evaluate the deformation, strength and stiffness of the chassis module, when a heavy loads is applied at the wheel center or tire patch of the module. Part library, project model, and load files in the system are realized in the form of xml and are stored in a database for reuse. The system is actively being used in the vehicle developing process.
한국형 표준원전의 방사선감시계통 및 공정제어계통 전원공급 국산화 개발
노재희(J. H. Roh),권영기(Y. G. Kwon),장동식(D. S. Jang),오치윤(C. Y. Oh),이찬호(C. H. Lee),김영국(Y. K. Kim),주동식(D. S. Ju),조형민(H. M. Cho),박욱기(W. .G Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
현재 가동 중인 원자력발전소 계측제어설비의 전원공급기를 살펴보면 인버터 또는 별도의 교류를 입력전원으로 사용한다. 직류 전원공급기들은 설비의 중요도에 따라 이중화로 구성된 설비도 있고 그렇지 않은 기기나 설비도 있다. 이중화로 구성된 전원공급기라 해도 교류 입력전원이 동일하다면 교류 입력이 상실될 때 이중화로 구성된 직류전원도 상실되어 관련계통의 가동이 정지된다. 이러한 문제점을 해결하기 위해서는 각기 다른 교류입력전원으로 동작되는 이중화전원공급기로 구성되는 것이 가장 바람직하다. 본 연구개발의 목적은 두종류의 설비에 소요되는 3종의 직류전원 공급기를 원자력 안정성등급으로 국산화하는 연구이다. 기존 제품들은 3종 모두 리니어 방식의 제품이지만, 방사선감시계통 현장제어기의 5V로직 전원공급기와 공정제어계통 전원공급기는 전력변환효율이 높고 소형, 경량화가 가능한 SMPS(Switched Mαel Power Supply) 방식으로 개발하였다. 방사선감시계통 현장제어기의 PCA(Printed Circuit Assembly) 저전압공급기는 다양한 종류의 출력전압과 저 전류형이므로 안정성 면에서 동일한 형식의 리니어 방식으로 개발하였으며 3종류 모두 출력용량을 20% 이상 향상시켰다. 또한, 논문을 통해 SMPS 방식의 전원공급기의 핵심 부품인 Control Module을 Hybrid IC형으로 자체 설계하여 성능이 우수한 제품을 지속적으로 생산할 수 있는 기틀을 마련하고자 한다.
교차가새형 선행 안전난간을 적용한 시스템비계의 구조 성능 평가
박주동,이현섭,신우승,권용준,박순응,양승수,정기효,Park, J.D.,Lee, H.S.,Shin, W.S.,Kwon, Y.J.,Park, S.E.,Yang, S.S.,Jung, K. 한국안전학회 2020 한국안전학회지 Vol.35 No.5
In domestic construction sites, when installing steel pipe scaffolding and system scaffolding, the guardrails are installed after the installation of the work platforms. This conventional guardrail system (CGS) is always exposed to the risk of falls because the safety railing is installed later. In order to prevent fall disasters during erecting and dismantling scaffolds, it is necessary to introduce the advanced guardrail system (AGS) which installs railings in advance of climbing onto a work platform. For the introduction of the AGS, the structural performance of the system scaffolding applying the CGS and the AGS was compared and evaluated. The structural analysis of the system scaffold (height: 31 m and width: 27.4 m) with AGS confirmed that structural safety was ensured because the maximum stress of each element of the system scaffolding satisfies the allowable stress of each element. As a result of performance comparison of CGS and AGS for each element, the combined stress ratio of vertical posts in AGS was 6.4% lower than that of CGS. In addition, in the case of ledger and transom, the combined stress ratios of AGS and CGS were almost the same. The compression test of the assembled system scaffolding (three-storied, 1 bay) showed that the AGS had better performance than the CGS by 9.7% (8.91 kN). The cross bracing exceeds the limit on slenderness ratio of codes for structural steel design. But the safety factor for the compressive load of the cross bracing was evaluated as meeting the design criteria by securing 3 or more. In actual experiments, it was confirmed that brace buckling did not occur even though the overall scaffold was buckled. Therefore, in the case of temporary structures, it was proposed to revise the standards for limiting on slenderness ratio of secondary or auxiliary elements to recommendations. This study can be used as basic data for the introduction of AGS for installing guardrails in advance at domestic construction sites.
비계작업의 추락재해예방을 위한 선행 안전난간 공법의 도입 타당성 분석
박주동,문성오,이현섭,정성춘,권용준,정기효,Park, J.D.,Moon, S.O.,Lee, H.S.,Jeong, S.C.,Kwon, Y.J.,Jung, K. 한국안전학회 2020 한국안전학회지 Vol.35 No.4
In the construction sector, there were 99 fatalities from falls associated with steel tube and system scaffolds for three years from 2016 to 2018 and out of which 27.3 percent (27 workers) were found to have occurred during installing and dismantling procedure. To erect scaffolding which is installed for the work at height, the work platforms are generally installed first and the safety guardrails are installed and vice versa to dismantle. As a result, workers are exposed to the risk of falling because they erect and dismantle scaffolding without guardrails. To minimize the risk of falling, it is necessary to study a new construction method that can erect or dismantle scaffolding while guardrails are installed (called advanced guardrail system). This study analyzed advanced guardrail system in terms of safety regulation, workability and economic efficiency by investigating the domestic situation on the use of scaffolding, reviewing domestic and foreign standards for guardrails and conducting economic feasibility study. The results of this study is expected to greatly contribute to preventing falls in scaffolding installation and dismantlement procedure. As a follow-up study, empirical research is required including physical test of scaffolding with advanced guardrail system and effectiveness analysis after trial applications.