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수치사진측량기법을 이용한 문화재의 3차원 모델링에 관한 연구
박운용,김진수,백기석 東亞大學校 建設技術硏究所 2004 硏究論文集 Vol.27 No.2
Digital high resolution cameras are widely available. and are increasingly use in digital close-range photogrammetry. And photogrammetry instruments are developing rapidly and the precision is improving continuously. The building of 3D terrains of high precision are possible and the calculation of the areas or the earthwork volumes have high precision due to the development of the technique of the spatial information system using computer. Using the digital camera which has capacity of keeping numerical value by itself and easy carrying. we analyze the positioning error according to various change of photographing condition. Also we try to find a effective method of acquiring basis data for 3D monitoring of high-accuracy in pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation and 3D embodiment of tumulus. In the study is about to efficient analysis of digital information data for conservation of cultural properties.
박운용,한웅,김동규,안계혁,김병주 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Carbon fiber reinforced plastic (CFRP) has been widely used in many engineering fields because of its high specific strength and stiffness. However, thermoplastic does not adhere well with carbon fibers because it has a low free surface energy. In addition, high viscosity in the melted phase causes poor impregnation. In this study, electrochemical oxidation and silane coupling agent treatment were performed to improve the interfacial strength between carbon fiber and polarized-polypropylene. The changes of interfacial properties were analyzed by using field emission scanning electron microscopy (FE-SEM), fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Mechanical interfacial properties of the carbon fiber/ polarized-polypropylene composites were investigated by using interfacial shear strength (IFSS) measurement.
클럭 표류 영향을 고려한 양방향 거리 인지 기반의 TOA/TDOA 추정 방안
박운용,박철웅,최성수,이원철,Park, Woon-Yong,Park, Cheol-Ung,Choi, Sung-Soo,Lee, Won-Cheol 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.7c
일반적으로 양방향 전송을 통한 TOA(Time Of Arrival) 정보는 두 디바이스간의 정확한 RTT(Round Trip Time) 정보로부터 도출되지만 디바이스간의 서로 다른 클럭 표류의 영향으로 인하여 RTT 측정 시 요구되는 응답 시간이 길 경우 매우 심각한 TOA 오차를 야기 시키게 된다. 이를 해결하기 위해서 본 논문에서는 비동기 시스템에서 클럭 표류의 영향을 줄이면서 TOA와 TDOA(Time Difference Of Arrival) 정보를 획득하는 방안을 제안한다. 이를 검증하기 위해서 IEEE 802.15.4a Task Group에서 제시한 단방향 전송을 통한 측위 방안과 비교하였으며 제안된 방안이 기존 방법들보다 개선된 성능을 보임을 확인하였다. Generally time of arrival (TOA) information via two way communications can be derived by accurate round trip time (RTT) between two devices. However, response time demanded in RTT measurement is long, a serious TOA error is caused by each different clock drift between two devices. In order to solve this problem, we propose the TOA and time difference of arrival (TDOA) estimation scheme with mitigating clock drift effect. To verify the performance of proposed method, we compared the proposed scheme with one way based TDOA acquisition method introduced by IEEE 802.15.4a Task Group and then we could conclude that the proposed method has better performance over other methods.
박운용,안상준,나종기 동아대학교 건설기술연구소 2002 硏究報告 Vol.26 No.1
Remote sensing is the science and of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under investigation. In this study, we presents methods by which the geometric detail in an image may be modified and enhanced. The specific techniques covered are applied to the image data directly and could be called image domain techniques. This use of spatial masks themselves are called spatial filters, In this study, we consider to image enhancement for Sobel filter, Prewitt filter, Laplacian filter and etc.
RTK GPS 측량에 의한 토공량 산정과 DTM생성에 관한 연구
박운용,송연경,배경호 동아대학교 건설기술연구소 2003 硏究報告 Vol.27 No.1
This paper deals with the calculation of earth volume in combination with RTK GPS and TS in the development district of residential land. It is the interpolation methods, the height , and the formula of volume calculation that the earth volume is calculated to compare with RTK and TS. As a result of comparing RTK with TS in the horizontal and vertical positions, the differences is 0.02m, 0.032m, and 0.100m at X, Y, and h. Through this results, the accuracy of RTK was confirmed, and took the average cut minus fill. The result was that TS has a lot of cut volume, and RTK has a lot of fill volume. and The cut and fill volume with RTK is much similar to that with TS, so it is applicable to the calculation of earth-volume. It is expected that RTK is applicable to a job site in no time and is the basis on the construction of DTM(Digital Terrain Model), the geometric correction of satellite imagery, and the construction of GIS database.
박운용,김천영 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2
Real-time Kinematic GPS enables high accuracy positioning by real time. If ambiguity use an integer solution, can obtain accuracy of several "mm", and can obtain accuracy of tens "cm" if use real solution. In this study, we accomplish surveying by existent traditional surveying techniques (Total Station), Static GPS techniques and new technology RTK –GPS techniques by Field Calibration about uniformity measuring point and then compared and analyzed each techniques positioning accuracy etc ., Result that achieve by Static-GPS in Plane area, about all measuring points, expressed error fewer than 3cm. Result that achieve RTK-GPS Surveying by Field Calibration in Plane area, could know that RTK-GPS techniques by Field Calibration is available in Plane area because expressing errors fewer than all 6cm, except case that do not get fixed solution of ambiguity. RTK-GPS by Field Calibration could know economically than existent conventional type measurement and existent GPS's measurement techniques that efficiency is very high.
지형공간정보체계를 이용한 상수도 관로의 종합적인 운영관리에 관한 연구
박운용,신상철,김정동 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2
The urban expansion and the modernization of the urban infrastructure need a new technology to message water service. GSIS gears an efficient management of manpower, saving of time and cost for data accumulation, by processing and managing in the form of unified data. As various types of data accumulated in relation to the construction of the infrastructure facilities, which comes out after the rapid urbanization of the areas, we need a rational GSIS to avoid the duplication and confusion of data and data system. In this study, I intend to suggest a scheme for the efficient administration of the urban infrastructure facilities, based on GSIS for the efficiency of the acquisition and utilization of data. Also, I propose a program to manage the urban-related information more efficiently and to establish a more advanced system of database, by drawing up Digital Map using standard type to set up database.