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학교 신축 공사장 화재원인과 대책
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대규모 건물군의 사설지역방재센터
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지방자치단체의 청년 정책개발 사례연구: 광주광역시 동구를 중심으로
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낙동강(洛東江) 중류수계(中流水系)의 수질조사(水質調査) 연구(硏究)$(1978{\sim}80$년(年))
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- 저자 : 李東璨 (검색결과 387 건)
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이동찬,조승현,양현익,Sang-kwon Na,김창완 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3
The present study conducted an analysis of waves and wind on the west coast of Jeju Island in South Korea to derive the loads for a structural analysis under operational, extreme, and survival conditions and then evaluated the structural strength of the DeepCwind semi-submersible platform of NREL for 5 MW wind turbine. As a floating structure is exposed to wind and wave loads in a highly changeable marine environment and consists of tubular joints with slender-element members, a load analysis is necessary for strength evaluation and design of the structure. The wave scatter diagrams based on KORDI’s 24-year measurements of sea states and the annual mean wind speeds were used as the operational conditions. A sea state with a period that is very likely to cause the resonance of a floating structure was applied as the extreme condition. Another sea state during the Bolaven, a typhoon passing west of Jeju Island in 2000, is adopted as the survival condition. The surface pressure distribution of DeepCwind calculate through hydrodynamic analysis was applied to a structural analysis model based on a hydrodynamicstructure interaction analysis. The evaluation of the structural strength is performed in accordance with the provisions of DNV-OS-C201 and API-2A-WSD under operational, extreme, and survival conditions.
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이동찬,강철구,Lee, Dong-chan,Kang, Chul-Goo 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.9
The hardware-in-the-loop simulation (HILS) of a railway vehicle is crucial for overcoming the limitation of field tests of a railway vehicle. A brake HILS system for a railway vehicle was previously not able to test the performance of a speed-sensing system of a railway vehicle, since wheelset speeds were generated only by computer simulations. In this paper, we present a novel wheelset speed implementation of a brake HILS system for a railway vehicle. Four wheelset speeds of a brake HILS system for a car of a railway vehicle are implemented using four small-sized servomotors, whereas the speed sensors and pole wheels used in the brake HILS system are the actual ones of the railway vehicle. According to the simulated speeds of four wheelsets in the dynamic equations of motion, four servomotors generate wheel speeds in real time, and then the measured wheelset speeds are fed back to the computer simulation model. Moreover, in this paper, we improve the performance of wheelset speed measurement via the T method instead of the M method presently used in the field. The performances of wheelset speed implementation and speed-sensor operation are demonstrated by experimental works using a HILS system.
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기업특성요인과 활동기준원가관리시스템이 기업내부고객의 만족도에 미치는 영향
이동찬,이창수 한국산업경제학회 2008 산업경제연구 Vol.21 No.6
본 연구는 기업특성변수가 시스템과 ABCM ABCM에 의해 산출·제공되는 원가정보, 품질관리정보, 시간관리정보, 성과측정정보 및 의사결정정보가 기업내부고객의 만족도에 어떤 영향을 미치는가를 검정하여 전략적 관리회계시스템으로써 ABCM의 유효성을 검정하는데 주된 연구의 목적을 두고 있다. 실증분석결과 첫째, ABCM 시스템을 도입한 기업은 그렇지 않은 기업에 비해 기업내부고객의 만족도는 향상되었다. 둘째, ABCM 시스템을 도입한 기업은 도입전보다 도입후에 ABCM에 의해 산출·제공되는 정보에 대한 만족도가 더 높았다. 이러한 결과에 의할 때, 기업경쟁력을 이루는 주요소에 대해 ABCM 시스템이 그 역할을 충분히 수행하고 있음을 알 수 있다. 셋째, ABCM의 도입기업과 미도입 기업 간에 기업특성이 차이가 있는지 검정한 결과, 자동화 정도에만 차이가 있었다. 즉 자동화비율이 높을수록 ABCM을 도입하려는 경향이 강하다고 할 수 있다. 기업에서 ABCM 시스템 도입여부를 결정할 때 기업내부고객의 정보욕구에 대한 만족도를 높임으로써 기업의 경쟁우위를 확보하는데 본 연구의 결과를 활용해 볼 수 있을 것이다. This paper attempts to investigate impacts of firm characteristic factors and activity-based cost management system on internal customers satisfaction. Therefore this paper use the Korean manufacturing listed firms as a research sample. We have contacted the activity-based cost management system controller to obtain permission into the study. Once the firm agreed to participate, we have visited activity-based cost management system divisional managers within the firm to administer the questionnaires. The questionnaires are primarily designed to collect information about the independent and dependent variables. However, an opportunity to interview many of the leading authorities in activity-based cost management system also provided an excellent opportunity to gather additional insight into the activity-based cost management system. A total of 1,100 questionnaires were sent out. 236 valid responses have been collected. The null hypothesis was formulated on the basis of the previous study. To test hypothesized relationships between the dependent and independent variables, we assume other variables are held constant. This paper findings can suggest for activity-based cost management system strategies setting as followings. The results of this paper help enhance the firms to become aligned and focused on improving the competitive strategies of activity-based cost management system.
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