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손정락(Sohn Jeong-Rak),김재준(Kim Jae-Jun) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.8
Construction industry is characteristic to require long periods for the completion of a project, and various functional units should be correlated in executing the project. It, therefore, is important that project manager should manage the functional work units effectively as a leader for the success of the project. In this study, the PMOM based on the matrix formation for project manager system is proposed to improve the inefficient current management system constituted by functional units with the decentralized responsibility in apartment construction project. When, especially, an active project management based on profitability and efficiency is introduced to the construction project, the proposed model of PMr type will reduce the inefficiency of current project management system, and contribute to a more efficient, practical management system.
공공기관의 사업관리조직 진단 및 CM수행능력 개선방안 -공동주택 건설사업 전문기관을 대상으로-
손정락(Sohn Jeong-Rak),김재준(Kim Jae-Jun) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.10
As a changing of construction environments and growing the need of efficient construction management, public authorities for public benefit need to have a point of view which avoids the existing project management system based on management of quantities and construction periods and adopts new project management system.<br/> Therefore, this study investigated the expected problems that can take place when the public authorities try to adopt CM services as a new project management system. These problems are made into problem-modeling through evaluating the existing project management system and CM services. Finally this study suggested a reasonable and applicable project management system. In the results of this study, the new project management system and the improving way of CM services, are expected to give a new change for developing of model into the roles of public authorities.
이정식(Lee Jeong-Seok),조건희(Cho Gun-Hee),전주영(Chun Chu-Young),손정락(Sohn Jeong-Rak),방종대(Bang Jong-Dae) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Recently, Korean cities have many problems such as decrease of a number of population and decline of a number of buildings and infrastructure quality. These problems are regarded as the urban regeneration in this study. As the respects of issue, this study should show analyzing on construction key technology and method of construction cost saving in affordable housing relation to has been establishing the urban regeneration. This study should suggest selection on the order of development priority factor of construction key technology for saving cost relation to apartment housing.
MW급 해상풍력발전기 나셀의 상태 감시를 위한 전력선 통신 성능 분석
손경락(Kyung-Rak Sohn),김경화(Kyoung-Hwa Kim),김현식(Seong-Uk Jeong),정성욱(Seung-Yun Nam),남승윤(Hyun-Sik Kim) 한국항해항만학회 2016 한국항해항만학회지 Vol.40 No.3
본 연구는 해상풍력발전기에 추가적인 통신전용선로를 확보하지 않고도 자체 전력선을 이용하여 나셀의 상태를 감시할 수 있는 시스템을 구현하는 것을 목표로 한다. MW 급 해상풍력발전기의 내부 전력선을 훼손하지 않고도 통신선로를 확보하기 위하여 유도성 결합기기반 비접촉식 무배선 통신시스템을 제안하고 성능시험 결과를 보고한다. 페라이트 복합물질을 이용하여 최대 500 A의 고 전류에도 동작할수 있는 전력선 통신용 유도성 결합기를 개발하였으며 제주도 풍력단지에서 실증시험을 진행하였다. iperf를 이용한 통신성능시험에서 풍력발전기 나셀부와 하단 기저부의 전력변환기간 100 m 길이의 전력선으로 최소 15 Mbps 이상의 통신 속도를 안정적으로 확보할 수 있음을 보였다. 이를 바탕으로 1 주일간의 연속적인 통신상태 시험을 수행하였으며 평균 20 Mbps의 데이터 전송률을 확인하였다. 시험기간 동안 단한번의 통신 불량도 발생하지 않았다. 다음으로 나셀 내부 온도 분포와 변화를 측정하기 위하여 적외선 카메라를 설치하였다. 카메라에서 획득한 실시간 열화상 이미지가 오류 없이 성공적으로 전송됨을 확인하였다. The goal of this study is to implement a communication system that can monitor the status of the nacelle using the power cable itself, without the dedicated communication lines such as an UTP cable and optical fiber for the offshore wind turbine . An inductive coupling powerline communication system for a MW class offshore wind turbine was proposed and its communication performance was demonstrated. The inductive couplers was designed for operation at up to 500 A using a ferrite composite materials. Field test was carried out on the wind farms of Jeju island. Using the iperf communication test program, we have obtained more than 15 Mbps data transmission rate through the 100 m power cable that was installed between the nacelle and the bottom of the power converter. In the data transmission stability test for a week, there was no failure ever. The minimum transmission rate was 15 Mbps and the average data rate was about 20 Mbps. Next, we have installed an infrared camera inside the nacelle in order to measure the temperature distribution and variation of the nacelle. The real-time thermal image taken by the camera was successfully sent to the monitoring system without error.