• 정보기술과데이타베이스저널
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• 제7권2호
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• pp.17-32
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• 2000

As XML emerging as the Internet electronic document language standard of the next generation, the number of XML documents which contain vast amount of Information is increasing substantially through the transformation of existing documents to XML documents or the appearance of new XML documents. Consequently, XML document retrieval system becomes extremely essential for searching through a large quantity of XML documents that are storied in and managed by DBMS. In this paper we describe the design and implementation of BADA-IV/XML query processor that supports content-based, structure-based and attribute-based retrieval. We design XML query language based upon XQL (XML Query Language) of W3C and tightly-coupled with OQL (a query language for object-oriented database). XML document is stored and maintained in BADA-IV, which is an object-oriented database management system developed by ETRI (Electronics and Telecommunications Research Institute) The storage data model is based on DOM (Document Object Model), therefore the retrieval of XML documents is executed basically using DOM tree traversal. We improve the search performance using Node ID which represents node's hierarchy information in an XML document. Assuming that DOW tree is a complete k-ary tree, we show that Node ID technique is superior to DOM tree traversal from the viewpoint of node fetch counts.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.163-167
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• 2002

Recently, owing to performance elevation of telecommunication technology, increase of wireless internet's subscriber and diffusion of wireless device, Interest about LBS (Location Based Service) which take advantage of user's location information and can receive information in concerning with user's location is increasing rapidly. So, MOMS (Moving Object Management System) that manage user's location information is required compulsorily to provide location base service. LBS of childhood such as service to find a friend need only current location, but to provide high-quality service in connection with Data Mining, CRM, We must be able to manage location information of past. In this paper, we design distributed manage system to insert and search Moving Object in a large amount. It has been consisted of CLIM (Current Location Information Manager), PLIM (Past-Location Information Manager) and BLIM (Distributed Location Information Manager). CLIM and PLIM prove performance of searching data by using spatiotemporal-index. DLIM distribute an enormous amount of location data to various database. Thus it keeps load-balance, regulates overload and manage a huge number of location information efficiently.

• 인터넷정보학회논문지
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• 제9권5호
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• pp.175-183
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• 2008

WiFi는 엑세스 포인트(AP)를 발견하고 링크 층 핸드오프를 위해 스테이션과 AP간의 인증 및 새로운 BSS나 ESS로의 접속에 관한 절차를 정의한다 WiFi 핫스폿 서비스의 주요 문제점 중 하나는 "통과-이동체(Passing Object)"에 관한 것이다. WiFi는 BSS나 ESS에서 이웃하는 두 AP들 간의 메시지 교환을 기술하고 있다. 만일 링크 층 핸드오프를 완료하기 전에 이동체가 이웃 AP를 그대로 통과한다면 터널링된 패킷이 전달되어야 하는 목적지를 잃게 될 수 있다. 이 논문에서, 우리는 고속 이동체를 추적하기 위해 서비스 도메인에 "위치 관리 엔티티(Positioning Entity)"를 정의하고 기존 방법과의 이동 성능을 비교하였다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제37권11호
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• pp.866-870
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• 2010

본 논문에서는 근접 에지라는 새로운 에너지 항을 추가한 개선된 스네이크 알고리즘을 제안한다. 제안된 알고리즘은 스네이크 셀 주위에 근접하는 에지가 있을 경우 이 에지와 스네이크 셀 간의 거리를 에너지로 나타내고, 이 에너지를 전체 에너지 함수에 포함시킴으로써 물체의 윤곽선 탐색을 보다 효과적으로 수행한다. 근접 에지 기반의 스네이크 알고리즘은 셀이 물체의 오목한 경계 부분으로 탐색하는 것을 가능하게 하며, 에너지 항 사이에 실험적인 가중치 조정을 거치지 않고도 복잡한 물체의 윤곽선을 강인하게 검출할 수 있다. 제안된 방법의 성능 평가를 위한 실험에서는 개선된 스네이크 알고리즘이 속도를 크게 저하시키지 않으면서 윤곽선 추출의 정확도를 보다 개선하였음을 확인할 수 있었다.

• 한국초등과학교육학회지:초등과학교육
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• 제19권1호
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• pp.145-156
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• 2000

Elementary school teachers' understandings about buoyancy were investigated through the questionnaire method. The questionnaire was composed of 4 questions on hydraulic pressure and 8 questions on buoyancy. The questions on buoyancy asked about the correlation of buoyancy with following basic concepts, density of liquid, volume of submerged object and so forth. 295 teachers on the 22 elementary schools in Busan, Yangsan and Gimhae were selected through random sampling method. The results of this study were summarized as follows: On the correlation of the magnitude and direction of hydraulic pressure with the depth of water, a large portion of the respondents had a scientific conception. But on the correlation of hydraulic pressure with density, the relatively small portion of them appeared to have a scientific conception. The respondents, on the whole, had a scientific conception about the correlation of buoyancy with density of liquid. But they seemed to have naive conceptions about the correlation of buoyancy with the volume of a submerged object and with the depth of water, the amount of water in container and the reduced amount of water by the object from container. We found that the respondents were context dependent and tended to search for solutions for the questions of buoyancy using the concept of pressure in the water. From above results, we suggested that in the would-be revised elementary science text book, the contents of pressure in the water should be introduced after the concept of weight in the water was gained.

• 한국컴퓨터정보학회논문지
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• 제15권12호
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• pp.151-162
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• 2010

유비쿼터스 컴퓨팅 환경을 구축하기 위하여 자동 식별, 센서 네트워크, 홈 네트워크 등의 다양한 분야에 대한 연구가 진행되고 있다. EPCIS(EPC Information Services)는 RFID 용용 시스템 개발에 필요한 태그 정보를 관리하는 저장소와 관련하여 EPCglobal에서 제안된 표준이다. 본 논문에서는 일반적인 객체 인식과 환경 정보 변화에 의존하는 객체 검색을 가능하게 하기위해 EPCIS 저장소를 설계하고 개발 및 구현한다. 또한 위치를 기반으로 하고 지속적으로 변하는 대용량 자료라는 면에서 RFID 자료와 유사한 센서 데이터를 통합처리 관리하여 USN(Ubiquitous Sensor Network) 환경 변화에 따른 객체 인식 등의 융합 처리가 가능하도록 설계한다.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권9호
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• pp.439-446
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• 2001

This paper considers the design technique of the real-time control algorithm to implement the electronic interlocking system which is the most important station control system in railway signal field. The proposed technique consists of the structure design and the detail design which are based on the ROOM(Real-Time Object-Oriented Modeling). The structure design is designed with a modeling using the heuristic search technique which, at first, catch and make out the specific requested condition, and then, is designed on the requested condition. The detail design can be implemented if it may get the satisfying values through the repetitive modeling after comparing and examining the data obtained from the structure design in order for the more reliable and accurate system to be implemented. The technique proposed in this paper is implemented with C++ language which is easy to be transferred and compatible with the existing interfaces, and also the operating system is designed and simulated on the VRTX which is a real-time operating system. This proposed technique is applied to the typical station model in order to prove the validity as verifying the performance of the modeled station.

• 전자통신동향분석
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• 제37권4호
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• pp.70-80
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• 2022

With the rapid growth in media service platforms providing broadcast programs or content services, content production has become more important and competitive. As a strategy to meet the diverse needs of global consumers for a variety of content and to retain them as long-term repeat customers, global over-the-top service providers are increasing not only the number of content productions but also their production efficiency. Moreover, a considerable amount of scene composition in the flow of content production work appears to be combined with rendering technology from a game engine and converted to object-based computer programming, thereby enhancing the creativity, diversity, quality, and efficiency of content production. This study examines the latest technology trends in content production such as virtual studio technology, which has emerged as the center of content production, the use cases in various fields of artificial intelligence, and the metadata standards for content search or scene composition. This study also examines the possibility of using object-based computer programming as one of the future candidate technologies for content production.

• 드라이브 ㆍ 컨트롤
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• 제19권3호
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• pp.9-15
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• 2022

This paper proposes a method for constructing and verifying datasets used in deep learning technology, to prevent safety accidents in automated construction machinery or autonomous vehicles. Although open datasets for developing image recognition technologies are challenging to meet requirements desired by users, this study proposes the interface of virtual simulators to facilitate the creation of training datasets desired by users. The pixel-level training image dataset was verified by creating scenarios, including various road types and objects in a virtual environment. Detecting an object from an image may interfere with the accurate path determination due to occlusion areas covered by another object. Thus, we construct a database, for developing an occlusion area detection algorithm in a virtual environment. Additionally, we present the possibility of its use as a deep learning dataset to calculate a grid map, that enables path search considering occlusion areas. Custom datasets are built using the RDBMS system.

• 한국학교수학회논문집
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• 제10권2호
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• pp.263-288
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• 2007

본 연구는 수학 7-가, 수학 8-가 교과서의 함수단원 분석을 통해 지필환경의 제한점을 알아본 후 탐구용 소프트웨어인 엑셀이 학생들의 일차함수의 과정-대상관점 형성 과정에 어떠한 영향을 미치는지 알아보는 것이다. 엑셀을 활용한 교수 실험은 학습능력 수준이 다른 다섯 명의 학생을 선정하여 중학교에서 다루고 있는 함수관련 내용을 중심으로 실시하였다. 교수실험은 5차시로 이루어졌으며, 각 학생의 활동 과정을 녹화, 녹음한 내용과 학생과의 면담, 관찰, 활동지 등을 분석하였다. 교수실험 결과, 엑셀을 활용해 식과 표와 그래프를 다양하게 조작한 역동적 탐구활동은 일차함수의 과정관점과 대상관점을 형성하는 데 중요한 비계설정(scaffolding) 역할을 했다.