• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.637-638
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• 2007

모바일 장치는 제한된 화면과 인터페이스를 가지고 있는 특징이 있다. 따라서 기존의 웹페이지를 수정 없이 이용하는 것은 어려우며, 모바일 장치에 특화된 웹페이지를 제공해야 한다. RSS 는 웹사이트의 갱신정보를 전달하는 포맷 이므로, 다양한 특성을 가지는 가지는 모바일 장치에서 쉽게 이용이 가능하다. 본 논문에서는, 이동통신사에서 서비스 가능한 모바일 RSS 리더를 개발하기 위한 요구조건 및 실제 구현 사항을 제시하고 있다.

• Journal of Korea Society of Industrial Information Systems
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• v.7 no.3
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• pp.62-67
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• 2002

From the view point of VLSI implementation, a new teaming algorithm suited for network with quantized connection weights is desired. This paper presents a new teaming algorithm for the DBM(deterministic Boltzmann machine) network with quantized connection weight. The performance of proposed algorithm is tested with the 2-input XOR problem and the 3-input parity problem through computer simulations. The simulation results show that our algorithm is efficient for quantized connection neural networks.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.4
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• pp.505-510
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• 2005

The RPO(randomized policy optimizer) algorithm, which utilizes probabilistic policy for the action selection, is a recently developed tool in the area of reinforcement learning, and has been shown to be very successful in several application problems. In this paper, we propose a modified RPO algorithm, whose critic network is adapted via RLS(Recursive Least Square) algorithm. In order to illustrate the applicability of the modified RPO method, we applied the modified algorithm to Kimura's robot and observed very good performance. We also developed a MATLAB-based animation program, by which the effectiveness of the training algorithms on the acceleration or the robot movement were observed.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.3
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• pp.193-204
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• 2006

In most existing distributed Web systems, incoming requests are distributed to servers via Domain Name System (DNS). Although such systems are simple to implement, the address caching mechanism easily results in load unbalancing among servers. Moreover, modification of the DNS is necessary to load considering the server's state. In this paper, we propose a new dynamic load balancing method using dynamic DNS update and round-robin mechanism. The proposed method performs effective load balancing without modification of the DNS. In this method, a server can dynamically be added to or removed from the DNS list according to the server's load. By removing the overloaded server from the DNS list, the response time becomes faster. For dynamic scheduling, we propose a scheduling algorithm that considers the CPU, memory, and network usage. We can select a scheduling policy based on resources usage. The proposed system can easily be managed by a GUI-based management tool. Experiments show that modules implemented in this paper have low impact on the proposed system. Furthermore, experiments show that both the response time and the file transfer rate of the proposed system are faster than those of a pure Round-Robin DNS.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.1
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• pp.77-88
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• 2005

Direct Georeferencing (DG) is based on the direct measurement of the projection centers and rotation angle of sensor through loading the GPS and INS in aircraft. The methods can offer us to acquire the exterior orientation parameters with only minimum GCPs, even the ground control process could be completely skipped. In this study, a CCD camera is simultaneously used in GPS/INS, and acquired CCD image through Direct Georeferencing produce digital orthoimage. In this process, methods of combining sensor and digital orthoimage are examined and estimated. For the comparison of the positioning accuracy digital orthoimage through Direct Georeferencing, GCPs determined by GPS surveying are used. Two digital orthoimage are produced; one with a few GCP and the other without them. The produced maps can be used to correct or revised 1:1,000 or 1:5,000 scale maps accordingly.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.20 no.1
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• pp.47-57
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• 2002

The intention of this study is to construct the spatial database and to extract attribute data which are able to complete the omitted data in the topographical map or completion map of construction using the image data of various form such as artificial satellite images, aerial photographs, terrestrial photographs and so on. This study used the single frame images only for the raw image data, supposing the case of rigorous photogrammetric method is not available or rapid acquisition of information is need. The extracted spatial and attribute data from the images are used for modifying and updating the database, and for providing visual effect useful for guide and management of the facilities. This study intended to develop the technique able to apply in the case where comparative high accuracy is not required or rapid modification is necessary, and to verify the possibility of editing and updating the digital map using the photographs or video images remained as old data. Many of previous research on the management system for university facility has been accomplished focusing on the design and construction of database itself. Otherwise, this study aimed for the construction of guide and management system based on compiling the digital map of present state using multi-imagery, and the more applicability was intended too.

• Journal of Korean Society for Geospatial Information Science
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• v.10 no.1 s.19
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• pp.91-100
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• 2002

Recently, many studies on the construction of management system for road facility have been accomplished, and in its process the digital map is used as the essential data for spatial database. But in case where the existing topographical map or completion map of construction data is not sufficient for Data Base construction, the compilation, modification or renewal of digital map should be conflicted with large obstacles. This study intended to extract the road facility information using the image data of various form such as aerial photographs, terrestrial photographs and so on. The terrestrial photographic images are taken by hand-held camera, digital camera and video camera which are widely used and of low price in general. This study used the single frame images only for the raw image data, and the extracted spatial and attribute data from the images are used for modifying and updating the database. In addition, the creating possibility of the digital map in the relative scale using the spatial data extracted from the single images was tried.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.4 s.34
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• pp.11-17
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• 2005

This study is to improve the modification of survey data and efficiency of update using digital map based on PDA_based surveying mapping system. This object is achieved by developing wireless communication module of PDA which is adaptable to Totalstation, and contents for its usage. It is achieved by drawing up transformation module of dxf file to editing the text file and the drawing. And it is achieved by drawing up modification module to layer control. This system will be efficiently used to surveying parts of spatial location information for real time mapping ind point positioning in field work.

• Journal of KIISE:Databases
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• v.28 no.1
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• pp.1-14
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• 2001

중대한 산업용 소프트웨어가 동작하는 공유된 객체지향 데이터베이스를 안전하게 변경하기 위해서는, 그 공유 데이터베이스를 변경할 동안 데이터베이스 위에서 작동하는 기존의 응용 프로그램이 지속적으로 작동되어야 한다. 데이터베이스 변경을 필요로 하는 새로운 요구사항은 새 응용 프로그램의 추가, 기존 응용 프로그램의 기능 확장, 초기 디자인 에러 수정 등으로 인하여 발생할 수 있다. 우리는 한 사람의 사용자가 다른 사용자에게 악영향을 주지 않고 데이터베이스 스키마를 변경할 수 있게 하여 이 문제를 해결하는 투명한 스키마 진화(TSE: Transparent Schema Evolution) 방법론을 소개한다. 이 방법론은 기존의 스키마를 직접 변경하는 대신 스키마 변경 연산의 의미를 반영하는 데이터베이스 큐를 공유 객체지향 데이터베이스 상에 생성하여 투명한 진화를 달성한다. 데이터베이스의 용량을 증가시키지 못하는 뷰 메카니즘의 한계를 극복하기 위하여 이 방법론은 데이터베이스 용량 증가 연산에 대하여 다음의 새 단계로 정렬된다. (1) 기저의 베이스 스키마는 데이터베이스 용량 증가를 위해 물리적으로 변호한다. (2) 데이터베이스 변경의 의미를 달성하는 목표 뷰가 위의 변화된 베이스 스키마로부터 생성된다. (3) 변화 이전의 베이스 스키마는 데이터베이스 뷰로서 재 구축된다. 이로써 기존의 다른 사용자가 정의한 데이터 인터페이스가 보존된다. 우리는 객체-지향 뷰 기술을 이용하여 스키마 변화 연산을 구현함으로써 TSE 방법론의 구현가능성(feasibility)을 확인하였다. 표준적인 객체-지향 뷰 모델이 정의되고 상용 객체-지향 데이터베이스인 잼스톤(Gemstone) 위에 구현되었다. 그 뷰 모델은 갱신 의미(semantic) 정의를 그 뷰가 베이스 스키마의 갱신 의미를 보존하도록 정의하였다. 그러한 뷰는 사용자가 그들이 실제로는 베이스 스키마가 아니라 뷰에서 작업하고 있다는 사실을 모르게 하기 위하여 TSE에서 필요하다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.26 no.2
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• pp.149-156
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• 2008

In this paper, we propose a method aiming at updating the building information of the digital maps using single high resolution satellite image and digital map. Firstly we produced a digital orthoimage through the automatic co-registration of QuickBird image and 1:1,000 digital map. Secondly we extracted building height information through the template matching of digital map's building vector data and the image's edges obtained by Canny operator. Finally we refined the shape of some buildings by using the result from template matching as the seed polygon of the greedy snake algorithm. In order to evaluate the proposed method's effectiveness, we estimated accuracy of the extracted building information using LiDAR DSM and 1:1,000 digital map. The evaluation results showed the proposed method has a good potential for extraction and revision of building information.