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박운용,안상준,정순룡 동아대학교 건설기술연구소 2002 硏究報告 Vol.26 No.1
Currently, the management of Triangulation-station and Bench-Mark is conducted by National Geography Institute(NGI). In this study, we are measured the official products of First Order Bench Mark(FOBM) and calculated the residual errors which are differences between the official product and results by Static-GPS, TS and PL-1 for same points. Then, we are compared each leveling techniques and analyzed the leveling accuracy. For the result achieved by each measurements, first, we are defined that the PL-1 could obtain higher accuracy than the others but the efficiency is low for taking many time second, TS could obtain low accuracy. We defined that Static-GPS is more economical than TS, PL-1. The efficiency and the accuracy by static-GPS are very high. Particularly, the residual errors for all survey line of NO.3 point are out of allowable error. So, GPS is contributed to the leveling survey for the efficiency, time and cost.
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디지털 카메라의 자체검정을 위한 도심측정방법과 타원 피팅 방법의 정확도 분석
박운용,정공운,송연경 동아대학교 건설기술연구소 2002 硏究報告 Vol.26 No.1
Digital high-resolution consumer cameras are widely available, and are increasingly used in close-range photogrammetry. The mechanical construction of the cameras often do not meet photogrammetric requirements, thus they have to be modelled sufficiently. An approach for camera modelling is discussed that introduces image-variant parameters of interior orientation. In addition a correction model based on finite elements is integrated that provides the correction of remaining errors in the sensor apace. All functional parameters are estimated simultaneously in a bundle adjustment. Significant improvements of object accuracy have been achieved with respect to standard calibration techniques based on self-calibrating bundle adjustment.
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박운용 ( Woon Yong Park ),김원필 ( Won Pil Kim ) 한국지역사회발전학회(구 한국지역사회개발학회) 2012 地域社會開發硏究 Vol.37 No.2
노출 콘크리트 시공은 매우 어렵고 중요하다. 노출 콘크리트를 시공함에 있어 복합적인 결함과 문제점을 발생 시키고 있다. 이러한 결함과 문제점을 돌출하여 해결하기 위해 본 연구의 목적은 현장 사례를 비교하여 현단타설 콘크리트 재료특성을 고려한 노출 콘크리트 품질관리 방안을 제시 하는데 있다. 분석결과, 재료 및 유지관리 측면에서 레미콘 수급계획 타설시 속도 및 높이 조절 등 시공관리가 전반적으로 이루어지지 않았다. 시공 및 재료품질 관리·유지관리 측면에서 제시된 개선방안은 노출 콘크리트는 단 한번으로 끝나기 때문에 철저한 시공계획과 숙련된 기능공이 필요하다. 노출 콘크리트의 결함을 최소화 하고 발생을 억제하기 위해서는 시공에 앞서 시험배합 및 모형실험이 이루어 져야하며, 적정 품질확보를 위해 시공적 측면과 재료 및 유관리 측면에서의 면밀한 작업관리가 필요한 것으로 판단된다. Placing exposed concrete is difficult and often causes complicated defects and problems. For this purpose, this study intended to suggest quality control method of exposed concrete by considering the characteristics of concrete work in site through comparative analysis of cases in construction. Research findings showed that from the standpoint of material management such overall construction management as placing speed, control of pouring height of remicon(ready mixed concrete) were not performed. It was also contended that appropriate scheduling of placing concrete and skilled workmanship of technician were needed because the placement of concrete is finished one time. In order to prevent and minimize defects of exposed concrete, the study recommended pilot batch, simulation/experiment before placing concrete and careful quality control from the perspective of construction management and maintenance.
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LR-WPAN에서 비주기적 전송 패턴을 갖는 임펄스 기반의 TOA 추정 기법
박운용(Woon-Yong Park),박철웅(Cheol-Ung Park),홍윤기(Yun-Gi Hong),최성수(Sungsoo Choi),이원철(Won-Cheol Lee) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.4A
최근 IEEE (Institute of Electrical and Electronics Engineers) 802.15.4a TG (Task Group)에서는 저소비, 저전력 뿐만 아니라 다수개의 피코넷이 공존하는 즉, SOPs (simultaneously operating piconets) 환경하에서 거리 인지가 가능하도록 규정하고 있으며 거리인지 (ranging)의 서비스에 따라 Ternary 코드를 이용한 coherent/non-coherent 방안이 표준으로 채택되었다. 그러나 표준안에서 제시된 최소의 펄스 간 간격(Pulse Repetition Interval; PRI)은 채널의 최대 초과 지연(Maximum Excess Delay; MED) 보다 좁아 펄스 간 간섭 (Inter-Pulse Interference; IPI) 문제가 발생되어 DS(Direct Sequence) 기반의 추정기법으로는 부정확한 최초 도착 시간(Time Of Arrival; TOA)을 얻게 된다. 따라서 본 논문에서는 IPI을 줄이면서 고정밀 TOA를 추정하기 위한 비주기적 펄스 전송 (non-periodic transmission; NPT) 패턴 기법을 제안한다. 수신단은 저속 무선 개인 영역 네트워크의 모티브를 고려하여 에너지 검출을 이용한 non-coherent 기반의 수신 구조로 구성하였다. TOA 정보는 슬라이딩 상관처리 후 역 탐색 구간 (Search Back Window; SBW)을 두어 오차를 감소시키고 사전 정해진 임계치를 이용하여 얻기 된다. 제안된 펄스 패턴 기법에 대한 성능을 검증하기 위해서 IEEE 802.15.4a TG에서 제시한 두 가지 채널 모델을 적용하였고 시뮬레이션 결과로부터 제안된 기법이 다수개의 피코넷이 공존하는 다중 경로 환경에서 일반적인 기법보다 성능이 개선됨을 확인하였다. Recently Task Group (TG) 4 of the Institute of Electrical and Electronics Engineers (IEEE) 802.15a has been recommended a system with ranging capability in existence of multiple Simultaneous operating piconets (SOPs) as well as low-cost, low-power. According to the ranging service, coherent and non-coherent based ranging schemes using ternary code have been adopted as a standard. However it is hard to estimate an accurate time of arrival (TOA) in case of using direct sequence based TOA estimation method because pulse repetition interval (PRI) offered by TG is more limited than the maximum excess delay (MED) of channel. To mitigate inter pulse interference (IPI) problem, this paper proposes a non-coherent TOA estimation scheme using non-periodic transmission (NPT) pattern. The proposed receiver is based on a non-coherent energy detection considering with motivation of low rate wireless personal area network (LR-WPAN). TOA information is estimated via proper comparison with a prescribed threshold after the sliding correlation and search back window (SBW) process for reducing TOA error. To verify the performance of proposed ranging scheme, two distinct channel models approved by IEEE 802.15.4a TG are considered. According to the simulation results, we could conclude that the proposed scheme have performed better performance than the conventional method on the existence of multiple SOPs.
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박운용,김진수,정공운 동아대학교 건설기술연구소 2003 硏究報告 Vol.27 No.1
As state-of-the-art usually high-quality digital cameras are used for photogrammetric industrial metrology. Digital high-resolution consumer cameras are widely available. and are increasingly used in close-range photogrammetry. The mechanical construction of the cameras often do not meet photogrammetric requirements, thus they have to be modelled sufficiently. The close-range photogrammetry is a surveying technique the acquiring the 3D object from 2D geometric appearance shown in the image. Camera treatment is relatively so simple. Camera position refer to the object can be freely adjusted by locating the exposure station at any site. So it is used effectively a small area or object for survey. In this study, suing 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 effective method of acquiring basis data for 3D monitoring of high-accuracy in sub-pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation.
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