• 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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.491-493
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• 2006

We introduce Location PDA Program which is a mobile system to display current location on PDA. The current location is calculated based on collecting location through each fixed node. Each fixed node sends location information of mobile node to Cell Manager system. And then, Cell Manager calculates final location based on related information and sends it to every mobile system which is connected to server and displays current location.

• 전자공학회논문지CI
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• 제48권3호
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• pp.27-35
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• 2011

사용자간 상호작용과 협업 기능을 바탕으로 한 소셜 네트워크 서비스 발달에 따라 이를 교수-학습에 활용하면서 개인 체험 중심의 구성주의와 접목되어 소셜 러닝으로 발전하고 있다. 이를 보다 잘 활용하기 위해서는 N-Screen웹, 스마트폰, IPTV)을 지원하는 커뮤니케이션 모델이 필요하다. 커뮤니케이션 모델은 학습자-교수자-시스템간의 상호작용을 지원하는 것이다. 하지만, 지금까지는 웹기반 이러닝 시스템 커뮤니케이션에 대한 연구가 주를 이루고 있다. 이에 본 연구에서는 소셜 러닝을 위한 서비스 환경을 N-Screen으로 확대하고, 끊김 없는 서비스를 위해 개인의 위치정보를 학습 활동에 활용할 수 있도록 지원하기 위한 커뮤니케이션 매니저를 설계하고 구현하고자 한다. 커뮤니케이션 매니저는 N-Screen 서비스를 위한 학습자의 유스케이스 도출 및 요구 기능을 정의하고, 이를 바탕으로, 커뮤니케이션 기능을 설계한다. 또한, 단말 각각의 서비스 특성을 고려하여, 개인화 위치정보를 반영 할 수 있도록 한다.

• ETRI Journal
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• 제37권2호
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• pp.262-272
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• 2015

In particular, for a practical mobile robot team to perform such a task as that of carrying out a search and rescue mission in a disaster area, the network connectivity and localization have to be guaranteed even in an environment where the network infrastructure is destroyed or a Global Positioning System is unavailable. This paper proposes the new collective intelligence network management architecture of multiple mobile robots supporting seamless network connectivity and cooperative localization. The proposed architecture includes a resource manager that makes the robots move around and not disconnect from the network link by considering the strength of the network signal and link quality. The location manager in the architecture supports localizing robots seamlessly by finding the relative locations of the robots as they move from a global outdoor environment to a local indoor position. The proposed schemes assuring network connectivity and localization were validated through numerical simulations and applied to a search and rescue robot team.

• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.65-72
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• 2016

Vehicle and marine navigation which are currently being commercialized provide route guidance service by specifying a fixed position as a destination. In the route guidance service of existing navigation, if the destination has to be changed in the middle, a new destination must be designated again to obtain the navigation service. However, if the destination can't be designated, it is difficult to clearly use it. In this paper, in order to overcome the difficulties of directions in the existing navigation, a new navigation specifying moving targets as the destination has been developed to get the directions. A proposed system is that a group is made and a group manager is appointed as a destination and then a user can get the route guidance based on location of the group manager. In the service way, relationship between the group manager and user is one-to-many and relationship between the user and group manager is one-to-one. The proposed technology is able to provide services that the user can easily find the moving targets such as the positioning surrogate drivers, tracking routes and location among travelers and finding children.

• 한국컴퓨터정보학회논문지
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• 제21권10호
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• pp.69-76
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• 2016

In this paper, we propose a real-time remote logging model for development of android applications using LBS(Location based Service). The model has two major parts: Mobile Log Management Service and Remote Log Server. Mobile Log Management Service consists of the log collector and the remote log manager. The log collector is an aspect of AOP which can collect logs from the target application without modifications of source codes. The remote log manager has a background service component so that it can receive logs whenever the log collector captures logs from the target application. Remote Log Server communicates with Mobile Log Management Service by socket interface. Therefore, Remote Log Server can show logs in real-time. To validate the efficiency of the proposed model, we show a case study, and compare the model with other models.

• 정보처리학회논문지C
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• 제13C권5호
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• pp.659-668
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• 2006

차세대 네트워크에서 이동성 지원을 위해 다양한 방식이 제시되고 있으나 이들의 성능이 상대적으로 비교된 바는 없다. 따라서, 본 논문에서는 MIPv6, IP2, QMMF, IMS 방식의 위치 등록 과정과 핸드오버 절차를 분석하고, 성능 분석을 위한 파라미터 및 시뮬레이션 방법을 이용하여 각각의 절차에 대한 등록 및 핸드오버 지연 시간과 비용 측면에서 성능을 비교 분석하였다. 결과적으로 위치관리자(Location Manager)가 코어 네트워크 상의 중심에 위치한 IP2가 다른 메커니즘들에 비해 가장 좋은 성능을 보임을 확인하였다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (C)
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• pp.445-447
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• 2003

본 논문에서는 PDA(Personal Digital Assistants)를 이용한 차세대 위치기반서비스를 위한 분산 DB 제어기(DB Scheduler)와 XML interpreter 및 UI Manager를 개발하고 구현하였다. 분산 DB 제어기에서는 지리적으로 뜯어져있는 많은 분산 DB의 데이터에 대해 실시간으로 지능적 수집 및 변경 등이 가능하도록 하는 DB 제어기술을 개발하였으며, XML Interpreter 및 UI Manager에서는 하나의 단말기로 다양한 환경 및 서비스 수용이 가능하도록 하는 클라이언트용 기능 개발을 하였으며 단말기를 서비스 및 목적에 맞게 customize 할 수 있도록 단말기 기종별 개발 언어 등 세부 규격을 분석하고 가능한 국제 표준을 따라 설계서를 작성하였다.

• Journal of the Korean Data and Information Science Society
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• 제18권4호
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• pp.1157-1170
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• 2007

LBS must manage various context data and make the best use of this data for application service in ubiquitous environment. Conventional mobile object data management architecture did not consider process of context data. Therefore a new mobile data management framework is needed to process location context data. In this paper, we design a new context management framework for a location based application service. A suggestion framework is consisted of context collector, context manager, rule base, inference engine, and mobile object context database. It describes a form of rule base and a movement process of inference engine that are based on location based application scenario. It also presents an embodiment instance of interface which suggested framework is applied to location context interference of mobile object.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.111-116
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• 2002

The types of service using location Information are being various and extending it's domain as wireless internet technology is developing and it's application part is widespread, so it is prospected that LBS (Location-Based Services) will be killer application in wireless internet services. This location information is basic and high value-added information, and this information services make prior GIS (Geography Information System) to be useful to anybody. The acquisition of this location information from moving object is very important part for these LBS. After this, when LBS is familiar to everybody, we can predict that LBS system load is so heavy for the acquisition of so many subscribers and vehicles. Moving object database (MODB) system manages objects like subscribes and vehicles that are moving and have telecommunication terminal checked one's location. MODB is consists of 4 part, moving object location acquisition part, moving object location storage part, moving object query processing part, and moving object application p art. In this MODB system, acquisition of moving object location part must provide guarantee location information as well as reduce telecommunication overhead. In this paper, we study of problems in acquisition a huge number o f moving objects location and design some acquisition strategies to reduce telecommunication overhead. And after implementation these strategies, we estimate performance of this system and quality of information.