• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.252-253
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• 2013

Many businesses, government offices, educational institutions, according to the characteristics of each business and information system is used. However, prevalence of smart phones and a wide range of mobile devices with services, which requires users with mobility, according to the latest mobile services and in many places, and is under development. Interworking between existing systems and mobile systems to be set aside for the development cost and time, a waste of human resources is getting worse. Also, in many places to provide mobile services to existing systems need to fix the problem is coming. In this paper, to solve the problem of interworking between existing systems and mobile systems for the data transfer and processing of existing server, web services server, and mobile systems has been developed between the library.

• The KIPS Transactions:PartD
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• v.13D no.6 s.109
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• pp.847-856
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• 2006

In this paper, we suggested a mobile collaboration framework for supporting mobile services among mobile devices, and designed and implemented on this environment. The suggested framework has three elements; groups of sensors and mobile devices(Fixed and Moving-typed PDAs) and a home server. We designed interfaces for interactions with each other in collaboration environment with three elements described above. The information collected by sensors can be share and exchanged by mobile devices or a home server in accordance with Push and Pull methods. This framework is based on the distributed object group framework(DOGF) we implemented before. Therefore the DOGF provides functions of object group management, storing information and security services to our mobile collaboration framework via application interfaces defined. The information collected by sensors is arranged according to user's security 'demands. And user profile information is used for checking authority of each service object. Each component for executing functions of mobile devices and a home server is implemented by TMO scheme. And we used the TMOSM for interactions between distributed components. Finally, we showed via GUI the executablity of a given healthcare application scenario on our mobile collaboration framework.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.1-6
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• 2014

This paper proposes a mobile content curation service to collect various online/offline publications. The company publishes one-time topic information to a broker server in advance and customer curates topic information on a mobile device by requesting it. The main characteristics of the proposed service are: it is based on request/response model rather than existing publish/subscribe model, can easily specify topic information by input string without QR code or audio recognition, and retrieves all of topic information anywhere anytime by storing it on mobile device. This service can be used for second screen campaign for TV and various online/offline events.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.11
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• pp.2261-2270
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• 2015

GIS(Geographic Information System) based Positioning technique uses geographic information to predict which satellites are visible or invisible. GPS positioning has poor positioning accuracy in dense urban area where tall buildings block the satellite signals. In this paper, we proposed GIS based Advanced Positioning technique of Mobile GPS to resolve this problem. Particularly, this technique improves positioning accuracy in dense urban area. It is consist of ephemeris and GIS server. We will inversely estimate pseudorange by using NMEA-0183 output data of mobile GPS. After that, we can find more accurate position by using ephemeris and GIS information.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.452-458
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• 2002

Although the reuse of the cached data for scrolling the map reduces the amount of passed data between client and server, it needs the conversions of data coordinates, selertive deletion of objects and cache compaction at client. The conversion is time intensive operation due to limited resources of mobile phones such as low computing power, small memory. Therefore, for the efficient map control in the vector map service based mobile phone, it is necessary to study the method for reducing wireless network bandwidth and for overwhelming the limited resources of mobile phone as well. This paper proposes the methods for racking pre-received spatial objects in client-server systems for mobile CIS. We also analyze the strengths and drawbacks between the reuse of cached data and transmission of raw data respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.173-176
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• 2013

This paper's questions, and an automatic scoring system written in HTML, and XML-based system that is at issue, the issue questions in a convenient offline automatically how to register, Easy to manage questions of issues, questions and problems of merging the PC and the mobile device in a place that can be obtained without taking the test system study. Server systems, and real-time registration questions merging problem, such as difficulty adjusting to the test required to build the system. Clients communicate with the server using the mobile device and the PC is required to take the exam in the View application, and responses are sent for treatment research.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.118-120
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• 2019

커넥티드카는 네트워크에 연결된 자동차가 다른 자동차 및 도로 인프라뿐만 아니라 스마트 디바이스와 통신하고 여러 소스로부터 실시간 데이터를 수집하여 다양한 서비스를 제공하는 것이다. 커넥티드카의 등장으로 인해서 자동차와 클라우드 서비스의 결합이 빠르게 진행되고 있으나 자동차 데이터 중 실시간 처리가 필수인 데이터가 많다는 특성이 있다. 그러므로 멀리 떨어진 중앙 집중식 서버에서 컴퓨팅을 하는 클라우드 컴퓨팅보다 최근 이슈가 되고 있는 디바이스와 가까운 가장자리에 위치한 서버에서 컴퓨팅을 하는 엣지 컴퓨팅이 커넥티드카의 실시간성을 보장하는 기술로 많은 관심을 받고 있다. 본 논문에서는 기존의 엣지 컴퓨팅과는 달리, 이동성이 있는 모바일 엣지 컴퓨팅(MEC) 환경에서 실시간 처리를 저해하는 요소를 찾아 원인을 분석하고 평가해 문제점을 해결하고자 한다. 먼저, MEC 환경을 구축한 후 오픈 소스 시뮬레이터인 Edge Cloudsim 에 적용시켜 시뮬레이션을 한다. 실험 결과 MEC 환경에서 실시간 처리를 저해하는 원인은 모바일 디바이스의 태스크가 오프로딩 되거나 응답을 받기 전 WLAN 의 범위를 벗어났을 때 Task Failure가 발생하기 때문임이 증명되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.370-372
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• 2014

This study questions, and an automatic scoring system written in HTML, and XML-based system that is at issue, the issue questions in a convenient offline automatically how to register, Easy to manage questions of issues, questions and problems of merging the PC and the mobile device in a place that can be obtained without taking the test system study. Server systems, and real-time registration questions merging problem, such as difficulty adjusting to the test required to build the system. Clients communicate with the server using the mobile device and the PC is required to take the exam in the View application, and responses are sent for treatment research.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.343-345
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• 2004

최근 무선 기기 사용자가 급증하고 있다. 이에 따라 교통제어 시스템과 같은 모니터링 및 제어 응용이 무선 기기에서 활발히 사용될 것으로 예상된다. 본 논문에서는 모바일 응용 중 M/VC(Model/View Controller) 응용의 신속한 작성을 지원하는 모바일 M/VC 응용 프레임워크를 소개한다. 모바일 M/VC 응용 프레임워크는 무선 통신 환경에서 클라이언트와 서버 객체의 상호작용을 자동 처리하기 위해, Java의 관찰자/피관찰자(Observer/Observable)를 확장한 모바일 관찰자/피관찰자 패턴과 Multiplexer, Demultiplexer 클래스들을 지원한다. 개발자는 이 프레임워크를 이용하여 Observable과 MobileObserver 클래스들로부터 필요한 객체를 생성한 후, 이들을 Multiplexer와 Demultiplexer 클래스가 생성한 객체에 구성적으로 상호 연결하여 응용을 생성한다. 즉, 개발자는 무선 환경을 고려하지 않고 모바일 M/VC 응용 프레임워크가 제공하는 Multiplexer나 Demultiplexer 클래스의 객체에 무선 관찰자/피관찰자 객체들을 조립식으로 연결함으로써 피관찰자의 상태 변화가 관찰자에게 전달되고, 관찰자를 통한 사용자의 입력이 피관찰자에게 전달되어 반영되는 모바일 응용을 신속하게 생성할 수 있다. 따라서, 모바일 M/VC 응용 프레임워크는 무선 통신 환경하의 컴포넌트 재사용성을 개선하고, 모바일 M/VC 응용의 생산성을 향상시킨다.

• Journal of Korea Spatial Information System Society
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• v.6 no.2 s.12
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• pp.39-49
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• 2004

An increasing number of distributed applications will be achieved with mobile technology. These applications face temporary loss of network connectivity when they move. They need to discover other hosts in an ad-hoc manner, and they are likely to have scarce resources including CPU speed, memory and battery power. Software engineers building mobile applications need to use a suitable middleware that resolves these problems and offers appropriate support for developing mobile applications. In this paper, we describe the meta-server building for middleware that addresses reflective context awareness and present usability with demonstration. Metadata is consist of user configuration, device configuration, user context, device context and dynamic image metadata. When middleware send a saving or retrieval request to meta-server, it returns messages to middleware after the verification of the request. This meta-server has the application for multimedia stream services with context awareness.