• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.3
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• pp.117-124
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• 2002

A high speed data link capability is one of the critical factors in determining the performance of the spaceborne SAR system with high resolution because of the strict requirement for the real-time data transmission of the massive SAR data in a limited time of mission. In this paper, based on the data link model characterized by the spaceborne small SAR system, the high rate multi-channel data link module is designed including link storage, link processor, transmitter, and wide-angle antenna. The design results are presented with the performance analysis on the data link budget as well as the multi-mode data rate in association with the SAR imaging mode of operation from high resolution to the wide swath. The designed data link module can be effectively used for the spaceborne and airborne applications which requires to expand the high speed data link capability.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.11a
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• pp.312-315
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• 2007

운전자의 변의와 안전을 위한 장치로 센서를 차량에 많이 부착하게 되었다. 레이더도 그런 센서 중의 하나로 다른 센서들 보다 정확하게 주변상황을 인식하게 해 준다. 하지만 그런 레이더 데이터에는 차량의 정보들 뿐만 아니라 주변의 장애물, 건물 동의 원하지 않는 데이터가 같이 들어 오며 이런 물체들은 뒤에 있는 물체들을 가리기 까지 한다. 이 논문에서는 RLS(Recursive Least Square)를 사용하여 이런 가려지는 물체들의 데이터들을 버리지 않고 사용할 수 있는 알고리즘을 제안한다.

• Annual Conference of KIPS
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• 2007.11a
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• pp.171-174
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• 2007

최근에 인간과 컴퓨터의 상호작용을 위한 입력장치 중 테이블-탑 디스플레이라는 멀티터치 입력장치가 활발히 연구되고 있다. 본 논문에서는 테이블-탑 디스플레이라는 환경에서 인간에게 가장 직관적인 도구인 손을 사용하여 입력된 온라인 필기 숫자를 전처리하는 방법을 제안한다. 테이블-탑 디스플레이 환경에 적합한 전처리 기법으로 대표점 추출을 위한 거리 필터링과 획 구분 및 잡음제거 등을 사용하였고, 데이터를 16방향 체인코드로 변환하였다. 이는 실제 필기운동 시의 궤적을 크게 왜곡 시키지 않으면서 테이블-탑 디스플레이가 갖는 환경에 기인한 잡음을 없애고, 데이터양을 줄일 수 있는 장점이 있다. 총450개의 필기 숫자 데이터를 사용하여 실험한 결과, 잡음이 제거되고 데이터양이 줄어들었으며 인식에 용이한 체인코드를 형성해 내었다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.5
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• pp.441-448
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• 2011

Lately, digital restitution was became common using digital aerial photos. Therefore, we can obtain three-dimensional data. As a plotting-maker is checked by naked eye, plotting original data is very useful for making reliable three-dimensional data including contour and elevation point layers. In this study, we want to make precise and accurate digital elevation model using plotting original data. Contour and elevation point layers was extracted in digital map and break line was extracted in plotting original data. And then, compared both of results. For comparison, we selected slight slope and complex topography area like a residence area, mountain and agricultural land. We extracted break line deleting layer until obtaining ideal digital elevation model. As the results, We could extract contour, elevation points, eight road and two boundary layers using break lines. And We could obtain precise elevation model. Editing break lines, the distortion of digital elevation model could be minimized in the complex and sharp slope area.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.6
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• pp.1055-1060
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• 2020

This study is a study on the analysis and measurement of the radar cross-sectional area of a miniature aircraft. Radar cross-sectional area for miniature aircraft in advance were analyzed using an electromagnetic analysis tool, and an actual miniature aircraft was manufactured and measured in an anechoic chamber. When measuring, the old model was used as reference data for RCS(radar cross section) characteristics and applied to the test result data of the actual reduced model. The measurement method improved the accuracy of the measurement by applying time gating to remove the influence on the components scattered inside the anechoic chamber. The RCS test results of the reduced model showed relatively high RCS characteristics in the microwave band, as the previous analysis results. In the future, we plan to utilize the method of RCS analysis and measurement for the target of the radar in the VHF(Very High Frequency)/UHF(Ultra High Frequency) band with a relatively large wavelength.

• The Journal of Society for e-Business Studies
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• v.9 no.3
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• pp.79-94
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• 2004

W3C has developed the RDF standard for utilizing ontology in Web applications. This paper presents extracting, storing, and applying ontology on product data. The management and document information included in DWG files is focused as an example. By analyzing the relationship among the drawing data, the RDF schema is designed frist. Based on the schema ontology is extracted and stored in XML files. As an application of the stored ontology, we the schema ontology is extracted and stored in XML files. As an application of the stored ontology, we can reconfigure the sitemap of drawing data repositories. In this example, the users can select the view that he or she is interested in (e.g., designer, document, project). With such various views of an drawing data repository, the users can access the specific data more effectively.

• Journal of Internet Computing and Services
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• v.21 no.2
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• pp.121-130
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• 2020

This paper suggests evaluating the military closed network data as an image which is generated by Generative Adversarial Network (GAN), applying an image evaluation method such as the InceptionV3 model-based Inception Score (IS) and Frechet Inception Distance (FID). We employed the famous image classification models instead of the InceptionV3, added layers to those models, and converted the network data to an image in diverse ways. Experimental results show that the Densenet121 model with one added Dense Layer achieves the best performance in data converted using the arctangent algorithm and 8 * 8 size of the image.

• The KIPS Transactions:PartC
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• v.15C no.4
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• pp.281-288
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• 2008

Recently, the advance of multimedia hardware has fostered the development of wireless multimedia sensor network which is able to ubiquitously obtain multimedia content such as image or audio from the environment. The multimedia data which has several characteristics such as large size and correlation between the data requires reliability in transmission. However, the existing solution which take the focus on the efficiency of network mainly, is not appropriate to transmit the multimedia data. In the paper, we proposes a reliable asynchronous image transfer protocol, RAIT. RAIT applies double sliding window method in node-to-node image tansfer to prevent the packet loss caused by network congestion. The double sliding window consists of one sliding window for the receiving queue, which is used for prevention of packet loss caused by communication failure between nodes and the other sliding window for the sending queue which prevents the packet loss caused by network congestion. the routing node prevents the packet loss and guarantees the fairness between the nodes by scheduling the packets based on the image non-preemptively. The RAIT implements the double sliding window method by cross layer design between RAIT layer, routing layer, and queue layer. The experiment shows that RAIT guarantees the reliability of image transmission compared with the existing protocol.

• Journal of the Korean Society for information Management
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• v.28 no.4
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• pp.141-160
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• 2011

This study examined perceptions of 109 professors at doctorate-granting universities in the U.S. who have self-archived in Institutional Repositories(IRs), predicated on the Diffusion of Innovations Theory. The majority of the faculty learned about IRs through the contact from IR staff or their presentations. Relating to five characteristics of an innovation, digital preservation and usage statistics of an IR were considered to be its relative advantage. The principle of Open Access(OA) was found to have compatibility with the values that professors ultimately pursued. The trialability of an IR was determined by the fact that IRs were adopted by faculty through the participation of pilot projects. Professors who gained positive and visible results from IR adoption seemed more strongly support the repository. In addition, it is necessary for IRs to provide stable and effective services that support the continued adoption of IRs.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.427-429
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• 2006

데이터 그리드는 분산 데이터베이스 환경에서 상호간 데이터의 공유 및 교환을 통하여 분산 데이터를 효율적으로 사용하기 위한 기술이다. 최근에는 레거시 시스템간의 협업을 하기 위해 상호 연결의 필요성이 강조되고 있으며 많은 연구가 진행되고 있다. 독립주인 레거시 시스템을 상호 연결하기 위해서는 노드간의 회선 점유율이 증가하고, 데이터의 이질적인 문제가 발생한다. 이러한 문제점을 해결하기 위해 본 논문에서는 XMDR 기반의 데이터 그리드 시스템을 제안한다. 본 논문의 데이터 그리드 미들웨어는 ISO/IEC11179에서 제안한 정보 공유 및 교환을 위한 표준인 MDR과 정보의 효율적인 이용을 위한 온톨로지를 포함하여 확장한 개념인 XMDR(eXtended Metadata Registry)에 기반을 두었으며 분산 플랫폼으로부터 독립적이고 자유로운 이동성을 가지고 있는 이동 에이전트 기술을 사용하였다.