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홍신표,이인원,박성현,이철민,전호환,임희창 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.3
An experimental study of the effect of mooring systems on the dynamics of a SPAR buoy-type floating offshore wind turbine is presented. The effects of the Center of Gravity (COG), mooring line spring constant, and fairlead location on the turbine’s motion in response to regular waves are investigated. Experimental results show that for a typical mooring system of a SPAR buoy-type Floating Offshore Wind Turbine (FOWT), the effect of mooring systems on the dynamics of the turbine can be considered negligible. However, the pitch decreases notably as the COG increases. The COG and spring constant of the mooring line have a negligible effect on the fairlead displacement. Numerical simulation and sensitivity analysis show that the wind turbine motion and its sensitivity to changes in the mooring system and COG are very large near resonant frequencies. The test results can be used to validate numerical simulation tools for FOWTs.
홍신표,조진래 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.6
This paper is concerned with the comparative numerical and experimental study on the natural behavior and the motion responses of a 1/75 moored scale model of a 2.5 MW spar-type floating offshore wind turbine subject to 1-D regular wave. Heave, pitch and surge motions and the mooring tensions are investigated and compared by numerical and experimental methods. The upper part of wind turbine which is composed of three rotor blades, hub and nacelle is modeled as a lumped mass and three mooring lines are pre-tensioned by means of linear springs. The numerical simulations are carried out by a coupled FEM-cable dynamics code, while the experiments are performed in a wave tank equipped with the specially-designed vision and data acquisition system. Using the both methods, the natural behavior and the motion responses in RAOs are compared and parametrically investigated to the fairlead position, the spring constant and the location of mass center of platform. It is confirmed, from the comparison, that both methods show a good agreement for all the test cases. And, it is observed that the mooring tension is influenced by all three parameters but the platform motion is dominated by the location of mass center. In addition, from the sensitivity analysis of RAOs, the coupling characteristic of platform motions and the sensitivities to the mooring parameters are investigated.
홍신표(Sinpyo Hong),정종원(Jong Won Jeong),이치원(Chi Won Lee),이호식(Ho Sik Lee),최한우(Han-Woo Choi),박인홍(In-Hong Park) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.2
Unmanned surface vehicles (USVs) conduct various mission while exchanging information with control centers. Maritime security, coastal surveillance, and sea surface and undersea inspections are included in the important missions of USVs. To carry out these missions, large amounts of information are required from sensors, such as cameras, radars, and sonars. High bandwidth wireless communication is necessary to send this information to the control center in real time. In general, USVs are mack using small boats. The motions of small boats are easily influenced by sea waves and the magnitude of changes in the attitude is large and the period of the changes is short in comparison with large ships. Thus, the direction of an antenna beam pattern for a wireless communication system in a USV can change rapidly, and with a large magnitude. In addition, since the reflection of electromagnetic waves on the sea surface is not negligible, the efftct of multipath noises on the wireless communication system must be considered carefully. There are also several other elements that negatively afftct wireless communication systems in USVs. This paper presents the wireless communication environment to be considered in the design and implementation of wide bandwidth communication systems for USVs. Short test results for wireless communication on the sea are also given.
홍신표(Sin-pyo Hong),이만형(Man-Hyung Lee),전호환(Ho-Hwan Chun),권순흥(Sun-Hong Kwon) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
This paper presents car test results to estimate alignment errors in the integration of a low-grade inertial measurement unit (IMU) with accurate Global Positioning System (GPS) measurement systems. Car tests were conducted with a low-cost IMU made with micro-electro-mechanical system (MEMS) technology and carrier-phase differential GPS measurement systems. Test results confirmed that the angular motion of the test car improves the estimation of the lever arm between the GPS antenna and IMU. They also showed that changes in acceleration improve the estimation of the relative attitude between the reference frames of a GPS antenna array and IMU. The lever arm was estimated with a ten-centimeter error. The relative attitude was estimated with a half-degree error. An iterative scheme was used to estimate the alignment errors during post-processing. The scheme was shown to be useful when the test car could not have sufficient changes in motion due to limitations in its path. With the given set of test data, the estimation error decreased as the number of iterations increased.<br/>
Kwon, Oh Yong,Hong, Shin Pyo 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.1
Uncoupling abents의 일종인 2,4-dinitrophenol과 peptidyl transfer reaction에서 단백질 합성을 억제하는 chloramphenicol를 처리하였을때의 종자의 發芽率과 各 發芽段階別 總窒素量의 量的 變化를 測定한 結果 다음과 같은 結論를 얻었다. 1. 20ppm 또는 50 ppm chloramphenicol과 2,4-dinitrophenol로 처리된 群의 發芽率은 무우, 콩. 당근 種子의 順으로 나타났다. 2. 당근 種子의 각 發芽段階에서 20 ppm chloramphenicol과 2,4-dinitrophenol의 영향은 무우, 콩, 당근 種子의 처리 群 가운데서도 가장 뚜렷하였다. 3. 당근 種子의 發芽에서 2,4-dinitrophenol의 영향은 chloramphenicol의 영향보다 더 큰 것이었다. Chloramphenicol과 2,4-dinitrophenol로 처리한 群사이에 절대적인 有意性은 없었다. 4. 각 種子發芽時 總窒素量의 급속한 감소율은 2,4-dinitrophenol의 影響은 떡잎이나 배젖의 저장 단백질의 분해 뿐만 아니라 胚의 단백질 합성에서 나타난다는 것을 示唆하는 것이다.