• Journal of Korea Multimedia Society
• /
• v.15 no.6
• /
• pp.805-813
• /
• 2012

In this paper, we have designed and developed a middleware for an effectively approaching database to the existed brain disease clinical research system. The brain disease clinical research system was consisted of two parts i.e., a register and an analyzer. Since the register collects the registration data the analyzer yields a statistical data which based on the diverse variables. The middleware has designed to database management and a large data query processing of clients. By separating the function of each feature as a module, the module which was weakened connectivity between functionalities has been implemented the re-use module. And image data module used a new compression method from image to text for an effective management and storage in database. We tested the middleware system using 700 actual clinical medical data. As a result, the total data transmission time was improved maximum 115 times faster than the existing one. Through the improved module structures, it is possible to provide a robust and reliable system operation and enhanced security functionality. In the future, these middleware importances should be increased to the large medical database constructions.

• ETRI Journal
• /
• v.8 no.3
• /
• pp.89-96
• /
• 1986

TDX-1의 원격교환장치(RSS)는 본체의 가입자 rack을 원격지에서 동작될수 있도록 하기 위해 정합부분을 추가하여 개발한 것이다. 본체와 RSS간의 데이터링크는 본체의 T-bus와 RSS내의 T-bus를 가상 연결시켜 IPC통신을 수행할 수 있도록 하는 기능이다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.33 no.1
• /
• pp.45-52
• /
• 2015

The interoperability of multi-source data has become more important due to various digital maps, produced from public institutions and enterprises. In this study, the automatic matching algorithm of multi-source building data using hierarchical matching was proposed. At first, we divide digital maps into blocks and perform the primary geometric registration of buildings with the ICP algorithm. Then, corresponding building pairs were determined by evaluating the similarity of overlap area, and the matching threshold value of similarity was automatically derived by the Otsu binary thresholding. After the first matching, we extracted error matching candidates buildings which are similar with threshold value to conduct the secondary ICP matching and to make a matching decision using turning angle function analysis. For the evaluation, the proposed method was applied to representative public digital maps, road name address map and digital topographic map 2.0. As a result, the F measures of matching and non-matching buildings increased by 2% and 17%, respectively. Therefore, the proposed method is efficient for the matching of building polygons from multi-source digital maps.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.10a
• /
• pp.797-800
• /
• 2001

영상 압축 분야에서 데이터의 압축이 필수적인데, 이때 가장 많은 중복성을 가지고 있는 시간적 중복성은 이전 프레임의 데이터를 이용하여 움직임 추정과 움직임 보상을 수행하고 추정된 움직임 벡터에 의해서 보상된 영상과 원 영상과의 차 신호를 부호화하여 데이터를 압축한다. 움직임 추정과 움직임 보상 기법은 비디오 영상압축에서 중요한 역할을 하지만 많은 계산량으로 인하여 실시간 응용 및 고해상도 응용에 많은 어려움을 가지고 있다. 만일 움직임 추정을 하기 전에 블록의 움직임을 예측할 수 있다면 이를 바탕으로 탐색 영역에서 초기 탐색점의 위치 및 탐색 패턴을 결정찬 수 있다. 본 논문에서는 움직임의 높은 시간적 상관성을 이용하여 초기 탐색점의 위치와 탐색 패턴을 결정함으로써 적응적으로 움직임 추정하는 새로운 기법을 제안하고 성능을 평가한다. 실험을 통하여 제안된 알고리즘은 계산량의 감소에 있어서 높은 성능 향상을 보였다.

• Annual Conference on Human and Language Technology
• /
• 2007.10a
• /
• pp.107-113
• /
• 2007

본 연구는 시맨틱 데이터 정합성 검사와 RDF 트리플 생성 기능을 가진 URI 서버 내 DB 스키마의 자동 생성 방안을 기술한다. URI 서버는 시맨틱 웹 기술 기반 프레임워크 구성에 필요한 핵심 엔진으로서 인스턴스 생성 관리기, 검색 엔진, 추론 엔진 등과의 상호 작용을 통해 시맨틱 데이터를 서비스한다. 도메인이 바뀌거나 서비스가 변경되는 경우 DB 스키마를 전문가에 의해 수작업으로 생성함으로써 서비스 환경 변화에 즉각 대응하지 못하는 문제점을 가진 기존 URI 서버를, 적재되는 온톨로지에 따라 DB 스키마를 동적으로 자동 생성하는 방식으로 변경함으로써 다양한 응용 분야와 도메인에의 높은 이식성(Portability)을 보장할 수 있도록 한다. 기반정보 온톨로지, 응용 온톨로지, 개인화 온톨로지 등 3개 온톨로지 스키마와 11만 건 이상의 Citeseer Open Access Metadata로부터 추출된 인스턴스를 대상으로 한 실험을 통해 URI 서버 내 DB 스키마 자동 생성 가능성을 실증하였다.

• Journal of Broadcast Engineering
• /
• v.13 no.2
• /
• pp.236-244
• /
• 2008

We propose a new building detection and description algorithm for Lidar data and photogrammetric imagery using color segmentation, line segments matching, perceptual grouping. Our algorithm consists of two steps. In the first step, from the initial building regions extracted from Lidar data and the color segmentation results from the photogrammetric imagery, we extract coarse building boundaries based on the Lidar results with split and merge technique from aerial imagery. In the secondstep, we extract precise building boundaries based on coarse building boundaries and edges from aerial imagery using line segments matching and perceptual grouping. The contribution of this algorithm is that color information in photogrammetric imagery is used to complement collapsed building boundaries obtained by Lidar. Moreover, linearity of the edges and construction of closed roof form are used to reflect the characteristic of man-made object. Experimental results on multisensor data demonstrate that the proposed algorithm produces more accurate and reliable results than Lidar sensor.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.11
• /
• pp.123-135
• /
• 2011

The domestic market of database in Korea is estimated to be over 3.663 trillion won. The data migration is getting to be more important along with the continuous growth of the database industry. g-CRM and private recommending function are examples of the service that can be given through coupling among customer database, product database, geographic information database, and others. The core infrastructure is also the database which is integrated, perfect, and reliable. There are not enough researches on efficient way of data migration and integrating process and investigation of migrated data though trends of database in IT environment as above. In connection with this issue, we have made a model for data migration on scientific and technological contents and suggest the result of data migration process adapting that model. In addition, we verified migration's exhaustiveness, migration's consistency, and migration's coherence for investigation of migrated data and database. From the result, we conclude data migration based on proper model has a significant influence on the database consistency and the data values correctness and is essential to maintain high qualified database.

• Information and Communications Magazine
• /
• v.31 no.12
• /
• pp.89-96
• /
• 2014

본고에서는 사용자의 콘텐츠 이용 방법 및 선호 요소를 능동적으로 수용하고 반영하는 접근성 메타데이터 서술 및 그들의 정합을 실현하는 접근성 플랫폼 구성 개요와 모형을 제시하고 그것의 개발과 서비스에 적용될 표준화 가능 항목과 범위를 제안한다. 본 제안은 사용자 개인화 및 접근성이 제공되는 전자책, 사이버 가정학습, 디지털 교과서의 표준에 따른 제작에 기여할 것으로 생각한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.9 no.3
• /
• pp.305-316
• /
• 1998

The impedance matching network with the simplfied real frequency technique (SRFT) is proposed as a method for bandwidth enhancement of microstrip antenna. The validity of the technique is based on the relative frequency insensitivity of the radiation pattern and gain characteristics as compared to the resonant behaviour of the input impedance. The most significant feature of this technique is that there is no need to find any analytical description of the antenna and generator, and it only utilizes directly real frequency generator and load data over the prescribed frequency band. Furthermore, it is not necessary to invent an analytic form of the system transfer function to assume a matching network topology in advance. In this paper, the transmission line model is used to investigate the rectangular microstrip antenna, and based on the Fano's bandwidth-enlargement theory, the SRFT is introduced to design the matching networks of microstrip antennas in order to obtain a constant gain over the frequency band of interest. Two representative microstrip antnnas with different structure are fabricated and tested. From these procedures, it is obtained that the proposed impedance matching networks of microstrip antenna improve the impedance bandwidth nearly three times compared to the antenna without them.

• The Journal of the Korea Contents Association
• /
• v.18 no.5
• /
• pp.256-264
• /
• 2018

This study performed statistical matching using population census microdata and financial panel data. It generated the national basic data for simulation including income and property. Using this data the basic old-age pension, which is one of the biggest benefits, simulation was performed by applying the micro simulation methodology. In addition, we verified the coherence of the analysis results by comparing simulation basic data and financial panel data, basic old-age pension pilot simulation analysis results and basic old&-age pension actual beneficiary data.