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무선 이동 애드 혹 네트워크를 위한 동적 그룹 소스 라우팅 프로토콜
곽운용(Woon Yong Kwak),오훈(Hoon Oh) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.11A
이동 애드 혹 네트워크에서는 노드의 이동성으로 인해 설정된 라우팅 경로를 안정적으로 유지하는 것이 어렵다. 본 논문에서는 사실상의 복수 경로를 의미하는 그룹경로를 사용하여 경로 안정성을 높인 그룹 소스 라우팅 프로토콜을 제안한다. 물리적으로 인접한 노드들끼리 클러스터 (혹은 그룹)를 형성하며, 각 클러스터는 모든 멤버들을 직접 연결하는 클러스터헤드와 클러스터를 유일하게 식별하기 위한 클러스터 레이블을 갖는다. 그룹경로는 소스에서 목적지까지 놓여있는 클러스터들의 레이블 시퀀스로 이루어진다. 그룹경로상의 각 클러스터에 속한 노드들은 클러스터들을 잇는 브릿지 노드들을 통해 그룹경로상의 다음 레이블을 갖는 클러스터의 노드로 패킷을 전달한다. 따라서, 그룹경로는 단일 링크 단절에 의해 쉽게 깨어지지 않고, 경로상의 인접한 그룹 간에 연결이 완전히 끊어지지 않는한 유효하다. 시뮬레이션을 통해 높은 이동성과 높은 트래픽 상황에서도 그룹 라우팅 프로토콜이 다른 주요 소스 라우팅 프로토콜들보다 안정성이 뛰어나다는 것을 입증하였다. It is very hard, but important to sustain path stability for a reliable communication in mobile ad hoc networks. We propose a novel source routing protocol that establishes a group path with virtual multiple paths to enable a robust communication. The entire mobile nodes form a disjoint set of clusters: Each has its clusterhead as a cluster leader and a unique cluster label to identify itself from other clusters. A group path is a sequence of cluster labels instead of nodes and the nodes with the same label collaborate to deliver packets to a node with next label on the group path. We prove by resorting to simulation that our proposed protocol outperforms the existing key routing protocols, even for a network with a high node mobility and a high traffic.
GPS를 이용한 항공삼각측량의 정확도 향상에 관한 연구
박운용,이동락,곽두호 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.1
This study deals with the airborne kinematic GPS position for aerotriangulation. It can decrease the cost which in necessary for the setting up and the preservation of the control points through the use of aerial control points, substitutes for ground control points which is required for the block adjustment with the exact determination of the camera exposure station at the instance of photo flight. This papers introduce the theory of GPS code and the additional parameters required to correct the sysnetic errors in the combined block adjustment. Also we intend to upgrade the reliability by the robust estimation method which can detect a few gross errors at a time. However, it is expected that aerotriangulation map production will be effective thanks to the fast improvement of C/A-code receiver and the development of observation method at the coastland which is difficult to set up the control points.
GPS/GLONASS 결합에 의한 차량의 이동궤적의 정확도 분석
박운용,이인수,곽두호,정성모 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.2
Satellite visibility, accuracy, and availability were increased by the combined GPS/GLONASS. But, there are some problems such as differences in the time frame, differences in the coordinate datum, and the problem of solving carrier phase ambiguities in the combined carrier frequency solutions due to different GLONASS frequency. Therefore, the author will access the accuracy analysis of positioning using the combined PGS/GLONASS, and intend to study the characteristics of the combined GPS/GLONASS with considered the rate of data acquisition according to satellite visibility, elevation mask angle and kinematic relative position at the combined GPS/GLONASS.
박운용,곽두호,정성모 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.2
This study deals with the derivation of coefficient of coordinate transformation suitable for TAEGU, KYUNG-SANG BUKDO to transform WGS-84 ellipsoid into Bessel ellipsoid according to the type of GPS network design and dimension. 2D + 1D and 3D results are shown similar through the dimensional analysis, and the accuracy of latitude, longitude using 3-parameters is less accurate than that of 2D + 1D and 3D, but height was more precise. But, overall accuracy was low. So, it is required that development of geoid model and complete check of reference control points is necessary to extract the coefficient of precise coordinate transformation using the result of GPS satellite surveying in small area.
LIS를 이용한 數値地圖와 數値地積圖의 重疊에 따른 正確度 分析에 관한 연구
박운용,곽두호,정성모,김정동 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1
The cadastral administration is centered around cadastral maps. It increasing that demand of the public for effective administration and higher quality of service through the development of application program of cadastral maps maintenance. Also, there has been much demands for the digital information of cadastral maps in other systems. Land Information System is the answer to meet with the public for effective administration and higher quality of service. In this study, The graphic and attribute data of cadastral maps were integrated on the same DBMS. Also, pointing out difficulties of database implementation and many experiences in the development of application program will be used effectively for further expansion of the automation of cadastral administration.
GPS를 이용한 항공삼각측량의 정확도 향상에 관한 연구
박운용,이동락,곽두호 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.1
This study deals with the airborne kinematic GPS position for aero triangulation. It can decrease the cost which in necessary for the setting up and the preservation of the control points through the use of aerial control points, substitutes for ground control points which is required for the block adjustment with the exact determination of the camera exposure station at the instance of photo flight. This papers introduce the theory of GPS code and the additional parameters required to correct the sysnetic errors in the combined block adjustment. Also we intend to upgrade the reliability by the robust estimation method which can detect a few gross errors at a time. However, it is expected that aero triangulation map production will be effective thanks to the fast improvement of C/A-code receiver and the development of observation method at the coastland which is difficult to set up the control points.