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김무승(Moo Seung Kim),손정호(Jung Ho Son),최익흥(Ick Hung Choe) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In the structural design of LNG and LPG carriers which transport low-temperature cargo, highly reliable design criteria considering the serious effects in case of structural failure are needed. Thermal stresses caused during loading and unloading processes and the effect of embrittlement caused by low temperature environment should be evaluated for the structural safty of ships. Therefore, heat transfer analysis which predicts the temperature of closed spaces and steel plates is required for the proper determination of steel grade to ensure enough toughness under the temperature conditions. In this study, a steady-state heat transfer analysis program for the complicated hull structures has been developed, which accounts for the heat balance of closed spaces and provides applicable heat transfer coefficients for thermal stress analysis. Application results for various types of liquified gas carriers are presented and discussed.
김무승(Moo Seung Kim),김판영(Pan Young Kim),박진수(Jinsoo Park),백쌍재(Ssang Jae Baek) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A fatigue design system for backhoe attachment of excavator is presented, which evaluates systematically the fatigue strength of arm and boom structures in the initial design stage of excavator. The system enables designers to carry out fatigue analysis promptly and conveniently following the procedure of fatigue life assessment including fatigue design load generation, transferring to FE model and fatigue life calculation. Correlation between the bending moments applied on the attachment and hot spot stresses at fatigue concerned areas is reviewed through full scale field measurement in order to verify the compatibility of bending moment as the fatigue design load. Maximum and minimum bending moments for excavating and dumping work is determined and transferred to analysis model automatically in the system and fatigue life is calculated from the results of FE analysis. The system is applicable to the optimum design of attachment in view of structural size, thickness and joint location.
UAV 탑재용 5G 기반 RTK 개발을 위한 Network-RTK 정확도 비교 분석
김건우(Geonwoo Kim),김무승(Moo-seung Kim) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.3
위성 항법 시스템인 GNSS를 기반으로 인공위성에서 제공하는 GPS 신호를 이용하여 실시간으로 이동체(UAV: Unmanned Ariel Vehicle)의 위치 정보 측정과 활용이 다양한 분야에서 늘어나고 있다. 이동체에 대한 정확도가 높은 측위 데이터를 얻기 위해 이동체에서 RTK 방식을 기반으로 측정한 위치 정보 데이터를 5G 통신을 이용하여 위치 정보를 보정하기 위한 알고리즘이 탑재된 오차 보정 엔진 서버로 위치 정보 데이터를 전송한다. 국토정보지리원에서 제공하는 GPS 오차 보정 데이터를 기반으로 한 Network-RTK 기법을 적용하여 이동체의 동일 위치에 대한 위치 정보 데이터를 획득하여 오차 보정 엔진 서버로 전송된 측정 위치 정보 데이터에 대한 오차 보정 과정을 엔진 서버의 알고리즘을 통해 수행한다. RTK 장비를 이용하여 측정한 이동체의 위치 정보와 Network-RTK 기법을 적용하여 보정한 위치 정보를 상호 비교하여 보정된 위치 정보 데이터에 대한 정확도를 분석한 결과 Network-RTK 기법과 오차 보정 알고리즘을 적용하여 위치 정보 데이터 보정 시 상대적으로 오차율이 낮은 결과를 보였다. Measurement and utilization of location information of a mobile vehicle (UAV: Unmanned Ariel Vehicle) in real-time using a GPS signal provided by a satellite is increasing in various fields. This setup is based on the GNSS satellite navigation system. The location information data measured based on the RTK method from the mobile object is transmitted using 5G communication to the error correction engine server equipped with an algorithm for correcting the location information. This error correction ensures high accuracy positioning data for the moving object. The location information data of the moving object is acquired by applying the Network-RTK technique based on the GPS error correction data provided by the National Geographic Information Institute. Subsequently, the error correction process is performed for the measurement location information data transmitted to the error correction engine server. In particular, the error correction is achieved through the algorithm of the engine server. The accuracy of the corrected position information data is analyzed by comparing the position information of the moving object measured using the RTK equipment and the one corrected by applying the Network-RTK method. The Network-RTK method and the error correction algorithm were applied sufficiently based on the feedback from this analysis. Altogether, the error rate was relatively low when correcting the location information data.