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A GIS-Based Analysis of Potential Sewer Choke in Western Sydney Region
임삼성,Fadhillah Norzahari,이형석 대한토목학회 2010 KSCE JOURNAL OF CIVIL ENGINEERING Vol.14 No.4
Geographical Information System (GIS) is used to assist Sydney Water, a state owned water utility, in their decision-making process to reduce the number of chokes occurring within their jurisdiction. The use of GIS enables Sydney Water to obtain easier visual interpretation of otherwise complicated and detailed raw data. GIS in this sewer choke analysis is found to be useful as it allows the spatial data to be correlated and helpful information e.g. the characteristics of the pipes to be symbolised accordingly. GIS can also be used to compute the extent of the area affected by concentrating on chokes occurring per region or on a grid basis. This let Sydney Water identify areas with high or low concentrations of sewer choke problems easily. Furthermore, queries can be run and data can be selected according to the user’s preferences. For example, users are able to query for data on chokes occurring due to a specific cause, such as tree roots ingression into the pipes, blockage by grease or debris, or pipe breakage. This study will hopefully assist Sydney Water in making quick and effective decisions for potential chokes according to the risk that they impose on the environment and population.
임삼성,조성준 한국항행학회 2003 韓國航行學會論文誌 Vol.7 No.2
본 연구에서는 저가형 GPS 수신기와 자이로 및 속도계를 결합한 혼합항법시스템을 개발하여 그 정확도를 실험하였다. 본 혼합항법시스템에서는 기존의 강결합 방식이나 연결합 방식과 달리 변형된 결합방식을 채택하여 GPS 수신기나 자이로 혹은 속도계를 자유롭게 선택할 수 있도록 하였다. 실험 결과, 본 혼합항법시스템은 기존의 항법 시스템보다 정확도가 향상되었으며 다중 경로오차를 상당히 제거할 수 있음이 밝혀졌다. 또한 본 항법시스템은 후처리 지리정보자료획득의 측면에서 유리한 것으로 나타났다. In this study, a hybrid navigation system with a low-cost GPS Receiver plus Gyro and Odometer is developed and tested. This hybrid navigation system adopted a modified coupling method which can be distinguished from tightly coupled method or loosely coupled method, so that GPS receivers or Gyros or Odometers can be chosen arbitrary. Comparing to the existing hybrid navigation system, the test results show that this navigation system enhances the accuracy and is robust against the multipath error. It is also proven that this system has an advantage of acquiring GIS data for post processing.
임삼성(Sam Sung Lim) 한국항행학회 2000 韓國航行學會論文誌 Vol.4 No.1
A GPS measurement solution, in general, is obtained as a least squares solution since the measurement includes errors such as clock errors, ionospheric and tropospheric delays, multipath effect etc. Because of the nonlinearity of the measurement equation, we utilize the nonlinear Newton algorithm to obtain a least squares solution, or mostly, use its linearized algorithm which is more convenient and effective. In this study we developed a fixed point algorithm and proved its availability to replace the nonlinear Newton algorithm and the linearized algorithm. A nonlinear Newton algorithm and a linearized algorithm have the advantage of fast convergence, while their initial values have to be near the unknown solution. On the contrary, the fixed point algorithm provides more reliable but slower convergence even if the initial values are quite far from the solution. Therefore, two types of algorithms, may be combined to achieve better performance.
임삼성(Sam Sung Lim),변수윤(Soo Yoon Byun) 대한공간정보학회 2000 한국공간정보시스템학회 논문지 Vol.2 No.2
GPS/GIS Related Information Technology evolves drastically and a great quantity of spatial information is available to users who require highly qualitative spatial information services. Hence the development of GIS tools that can improve position accuracy and maintenance efficiency is required. To meet various requirements from users, we developed a GPS data processing component based on OLE/COM by utilizing GDK which is a unique domestic GIS product. Also we developed an application package that includes the GPS data processing component to implement GPS into GIS. The development of GPS data processing component will contribute toward the expansion of component-wise GIS softwares.