• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.309-312
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• 2005

The need for LBS (Loc,ation Based Services) is increasing due to the wnespread of mobile computing devices and positioning technologies~ In LBS, there are many applications that need to manage moving objects (e.g. taxies, persons). The moving object join operation is to make pairs with spatio-temporal attribute for two sets in the moving object database system. It is import and complicated operation. And processing time increases by geometric progression with numbers of moving objects. Therefore efficient methods of spatio-temporal join is essential to moving object database system. In this paper, we apply spatial join methods to moving objects join. We propose two kind of join methods with TB- Tree that preserves trajectories of moving objects. One is depth first traversal spatio-temporaljoin and another is breadth-first traversal spatio-temporal join. We show results of performance test with sample data sets which are created by moving object ,generator tool.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.229-232
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• 2004

This paper developed a web service system providing hydrographic information encoded by GML rules. In order to achieve the goal, every data included in an ENC, which is following the rules of the S-57 and S-52 from the IHO, is transformed into a data structure form of OLE/COM from the OOC. In the system, hydrographic information can be provided through a data provider, and then it can be encoded into GML format for web services. This paper also implemented a web client that requests hydrographic information to the server and renders result data which is a GML format following the rules of S-57.

• Journal of information and communication convergence engineering
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• 제10권2호
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• pp.181-186
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• 2012

Telematics services include automatic location tracking for emergency rescue, which is available for use in case of a car accident due to falling off roadways. This paper presents a simulation study on how far a car will fall before it hits the ground if it drops off of a roadway due to an accident or a natural disaster. The greatest horizontal distance the falling car can travel is presented in this paper, based on the assumption that air resistance as well as the direction and degree of acceleration due to gravity is negligible. This paper also presents the depth of the dent caused by the car sinking into the ground, the time it took for the car to fall free, and the velocity at which it travelled and horizontal distance it traveled. In this paper, the damage done to cars that crash into the ground and the dangers thereof are graphically represented.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.105-108
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• 2003

In the next generation backbone networks based on dense-wavelength division multiplexing (DWDM), the routing and wavelength assignment with quality-of-service (QoS) recovery is essentially needed to support a wide range of communication-intensive and real-time multimedia services. This paper proposes a new dpmic routing method called as MW-MIPR (MultiWavelength-Minimum Interference Path Routing), which chooses a route that does not interfere too much with many potential future connection requests. This paper also proposes a differentiated RWA mechanisms combined with MW-MIPR algorithm to provide QoS recovery for various multimedia applications in the next generation backbone networks based on DWDM.

• 한국문헌정보학회지
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• 제24권
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• pp.263-288
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• 1993

The use of telematics, or of data communications, for the information services is a much debated issue currently in the information science. The purpose' of this study is to gain a general overview of the use of data communications in specialized information centers in order to find out the direction of development in furture. In this study, the state of the specialized information services by data communications in Korea was analysed from the following points of view: (1) What kind of role play the liberalization of telecommunication to help develope the specialized information services? (2) Which problems have happend to the specialized information services using data communications? (3) How are technical, economical, and methodical problems handled for the new services? The background research stems from interview with managers and researchers in 5 specialized information centers.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.725-727
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• 2006

The development of GIS and Location-Based Services requires a high-level database that will be able to allow real-time access to moving objects for spatial and temporal operations. MODB.MM is able to meet these requirements quite adequately, providing operations with the abilities of acquiring, storing, and querying large-scale moving objects. It enables a dynamic and diverse query mechanism, including searches by region, trajectory, and temporal location of a large number of moving objects that may change their locations with time variation. Furthermore, MODB.MM is designed to allow for performance upon main memory and the system supports the migration on out-of-date data from main memory to disk. We define the particular query for truncation of moving objects data and design two migration methods so as to operate the main memory moving objects database system and file-based location storage system with.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.748-751
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• 2005

본 논문에서는 지상파 DMB(T-DMB)를 텔레매틱스 무선통신 방식으로 활용하기 위한 테스트베드 구축방안을 조사하였다. 텔레매틱스 무선통신 테스트베드는 실내 테스트베드와 실외 테스트베드로 구성된다. 연구 결과로 텔레매틱스 요소기술에 대한 개별 기능 시험을 위한 실내 시험과 실제 도로와 같은 환경에서 주행 중에 행하는 성능 시험 등의 실외 시험을 수행할 수 있는 테스트베드 구축 방안을 도출하였다. 아울러 T-DMB를 텔레매틱스에 활용하기 위해 필요한 양방향성을 지원하기 위한 리턴 채널 구성 방안을 제시하였다.

• 한국IT서비스학회지
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• 제11권1호
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• pp.125-139
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• 2012

Machine-to-Machine(M2M) refers to technologies allowing both wireless and wired systems to communicate with other devices. The enhancement of wireless technologies and the reduced cost of wireless connection have contributed toward the development of M2M market. M2M market currently focuses on public sector services, As M2M can offer scalable and flexible services, M2M services are expected to be applied in various fields. However there are still some doubts on whether the demand for M2M services will be increased. This study investigates the feasibility of M2M services from the perspective of operators. Operators evaluate that M2M services will show high marketability but low profitability in general. In addition, operators predict that M2M services will show both marketability and profitability in the area of car maintenance, insurance, telematics, home and office security, shop floor maintenance, and real-time locating services for children protection. This study may offer some ideas of M2M business models based on empirical feasibility studies.

• 대한전자공학회논문지TC
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• 제43권9호
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• pp.14-24
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• 2006

초기 지상파DMB(T-DMB)는 단방향 방송 서비스만을 제공하였으나, 최근에는 이동통신의 리턴채널을 이용한 양방향 데이터 서비스까지 제공한다 T-DMB는 텔레매틱스, RFID 등과 같은 이질적인 응용서비스와 통합된 서비스를 제공하는 형태로 진화될 것으로 예측된다. 이러한 관점에서 T-DMB 플랫폼에서 다양한 텔레매틱스 및 RFID 응용들을 지원할 수 있는 프레임 워크가 정의되어야 한다. 본 논문에서는 T-DMB가 양방향 인터렉티브 통신을 제공하는 환경에서, 교통정보 서비스, 콘텐츠 서비스와 같은 REID 응용서비스를 제공할 수 있는 통합 서비스 모델을 제안하였다. 실현을 위해 서비스 시나리오, 네트워크 참조 모델, 각 엔티티의 기능, 데이터 전송 방법, 메시지, 코딩 규칙을 설계하였다. 제안한 모델은 RFID 리더 기능이 없는 T-DMB 단말상에서, FRID 응용서비스를 동일하게 제공받을 수 있다. 또한, TPEG-Location 응용을 이용하므로 사용자의 위치를 기준으로 교통 및 여행자 정보(TTI) 서비스뿐만 아니라 주변에서 제공하는 모든 RFID 응용서비스를 이용할 수 있다. 메시지 구조는 TPEG 표준을 따라 설계하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.256-259
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• 2004

Recently, Location-based services(LBS) allow consumers to receive services based on their geographic location data. Users want to take services based location information with portable devices. And Point of Interest(POI) information's usage is increasing with mobile device's development and user's interest. And this paper shows that we connect the multimedia POI database(DB), provide the multimedia services through the portable devices and search POI using location and direction information. The multimedia POI is consisted of sound, image, moving image and animation with location information. When we search POI, we find POI in DB using the area zone and direction information.[l]