• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.108-110
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• 2008

최근 무선 통신 기술의 발달은 장비를 간편화 하고 편리화 시키게 되었다. 또한 다양한 서비스를 창출 할 수 있는 기반이 마련하였다. 하지만 무선 랜의 다양한 서비스와 접속성의 확대는 보안의 취약점을 야기 시켰다. 본 논문에서는 IEEE802.11 무선 랜 서비스를 통하여 PDA 상에서 AP의 정보를 받아 무선 랜 보안 서비스의 특성과 취약성을 살펴보고 PDA 기반 위치 추적 시스템을 구현을 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.703-705
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• 2009

기존 통합 프로토타이핑 시스템은 가상과 실물 프로토타이핑간의 단순 연결을 통하여 시뮬레이션만 하는 것이 한계였다. 본 논문에서는 그러한 통합 프로토타이핑 기술을 개량하여 GUI기반의 가상 프로토타이핑 개발도구에 컴포넌트형태로 넣어서 드래그엔드랍을 통한 통합 프로토타이핑 시스템 환경을 구축하는 것에 대해서 보이고 있다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.44 no.4 s.316
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• pp.27-34
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• 2007

In this paper device driver for camera capture in hand held mobile system is implemented based on microsoft windows CE operating system. We also study the storage device driver based on the FAT fie system by using NAND flash memory as a storage device. We use the MBA2440 PDA board for implementing the hardware for image capture by using CMOS camera module producted by PixelPlus company. This camera module has VGA $640{\times}480$ pixel resolution. We also make application program which can be cooperated with the device driver for testing its performance, for example image capture speed and quality of captured image. We check that the application can be cooperated well not only with the device driver for camera capture but also with the device driver for FAT file system designed especially for the NAND flash memory.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.336-339
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• 2000

산업의 급속한 발전은 많은 폐자원을 발생시킨다. 특히 연안 지역은 특성상 다양한 산업들에 의해 여러 종류의 폐자원이 배출된다. 본 논문에서는 이러한 연안역의 폐자원 데이터를 관리하고 활용하기 위한 데이터베이스를 구현하였다. 폐자원 및 폐자원 활용 데이터를 표현하기 위한 데이터 모델을 설계하고 구현하였다. 인터넷 환경에서 데이터수집미치검색을 효과적으로 지원할수 있도록 하였다.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.941-942
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• 2006

A depth measurement system to recognize 3D shape of objects using single camera, line laser and a rotating mirror has been investigated. The camera and the light source are fixed, facing the rotating mirror. The laser light is reflected by the mirror and projected to the scene objects whose locations are to be determined. The camera detects the laser light location on object surfaces through the same mirror. The scan over the area to be measured is done by mirror rotation. The Segmentation process of object recognition is performed using the depth data of restored 3D data. The Object recognition domain can be reduced by separating area of interest objects from complex background.

• Journal of Korea Multimedia Society
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• v.19 no.8
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• pp.1498-1504
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• 2016

The progress of mobile computing technology is bringing a large amount of multimedia contents such as image. Thus, we need an image retrieval system which searches semantically relevant image. In this paper, we propose a semantic image annotation and retrieval in mobile environments. Previous mobile-based annotation approaches cannot fully express the semantics of image due to the limitation of current form (i.e., keyword tagging). Our approach allows mobile devices to annotate the image automatically using the context-aware information such as temporal and spatial data. In addition, since we annotate the image using RDF(Resource Description Framework) model, we are able to query SPARQL for semantic image retrieval. Our system implemented in android environment shows that it can more fully represent the semantics of image and retrieve the images semantically comparing with other image annotation systems.

• Journal of Korea Society of Industrial Information Systems
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• v.14 no.5
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• pp.1-9
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• 2009

Relay-assisted multiple input technique has become a promising candidate for next generation broadband wireless communications. In this paper, we propose channel selective relay-based multiple input transmission system. In the proposed system, single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA) are adopted for uplink and downlink transmissions, respectively. The performance of relay-based system can be improved by using the subcarriers selectively based on the channel condition between relay station (RS) and mobile station, or between RS and base station. Simulation results show that the proposed relay-based system considerably outperforms the conventional relay-based system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.1
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• pp.38-43
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• 2004

We designed and implemented a medical image query system, including a relational database and DBMS (database management system), which can visualize image data and can achieve spatial, attribute, and mixed queries. Image data used in querying can be visualized in slice, MPR(multi-planner reformat), volume rendering, and overlapping on the query system. To reduce spatial cost and processing time in the system. brain images are spatially clustered, by an adaptive Hilbert curve filling, encoded, and stored to its database without loss for spatial query. Because the query is often applied to small image regions of interest(ROI's), the technique provides higher compression rate and less processing time in the cases.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.39-41
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• 2015

사물중의 하나라고 볼 수 없는 지하철의 각 좌석은 좌석에 대한 구분, 위치, 착좌 정보 등 구분할 수 있는 사물 정보가 있으며, 특히, 착좌 정보는 실시간으로 변경이 되어 지하철을 사용하는 사용자에게 유용한 정보를 제공할 수 있다. 본 논문에서는 지하철의 각 좌석에 센서를 부착하고, 각 좌석을 인터넷에 연결하여 실시간 지하철 좌석 정보를 제공하며, 이를 활용할 수 있는 모바일 어플리케이션을 포함한 지하철 좌석정보 시스템을 설계하고 개발하는 사물 인터넷 시스템을 설계하고 개발한다. 이를 통하여 다양한 지하철 정보를 수정하고 실시간 분석하고, 이를 활용할 수 있는 방안을 제시해보도록 한다.

• Journal of Korean Library and Information Science Society
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• v.39 no.4
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• pp.189-214
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• 2008

Objective of this research is to point out problems of geographic division structure in current Korean Decimal Classification System and provide solutions. For this purpose key classification methods were divided to decimal and non-decimal classification methods and analyzed for geographical division principles. In addition, national institutes regional division standards from Korea, USA and Japan were researched. Through these analysis, we provided suggestions to improve the table of geographical division in KDC4 including public institutions administrative district classification structure relations and consistency, and other regional divisional standards (proposal) instead of typical administrative district reflecting various geographical conditions.