• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.139-141
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• 2004

사용자를 중심으로 하는 주변환경과 사용자간 흑은 사용자와 장치간의 상호 운용성을 지능적, 자동적으로 선택하여 지원해 줌으로써 사용자로 하여금 정보 획득 및 실행을 보다 용이하게 하는 상황인식 기술은 유비쿼터스 컴퓨팅 환경에서 가장 중요한 핵심 기술이다. 따라서, 본 논문에서는 유비쿼터스 컴퓨팅을 위한 상황인식 기반의 미들웨어 및 컨텍스트 서버를 설계 및 구현한다. 먼저 미들웨어는 블루투스 (Bluetooth) 무선 통신 기술을 이용하여 이동성을 지닌 이동 노드를 발견하고, 컨텍스트 서버에 등록하여 해당 컨텍스트에 적합한 실행 모듈을 서비스하는 기능을 담당한다. 컨텍스트 서버는 주어진 원격 객체의 정보와 사용자의 현재 상태 물리적 환경의 상태 등의 상황 정보를 효율적으로 데이터베이스 서버에 저장하고 관리할 수 있는 기능을 수행한다. 마지막으로 응용 시스템을 통해 제안하는 미들웨어와 컨텍스트 서버의 유용성을 보인다.

• Journal of KIISE:Computing Practices and Letters
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• v.12 no.1
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• pp.31-42
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• 2006

Context-awareness is a technology to facilitate information acquisition and execution by supporting interoperability between users and devices based on users' context. It is one of the most important technologies in ubiquitous computing. In this paper, we propose a middleware and a context server for dealing with context-awareness in ubiquitous Computing and implement an application system using them. The middleware proposed in our work plays an important role in recognizing a moving node with mobility by using a Bluetooth wireless communication technology as well as in executing an appropriate execution module according to the context acquired from a context server. In addition, the proposed context server functions as a manager that efficiently stores into a database server context information, such as user's current status, physical environment, and resources of a computing system. Finally, our application system implemented in our work one which provides a music playing service based on context information, and it verifies the usefulness of both the middleware and the context server developed in our work.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.4
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• pp.479-485
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• 2005

Recently, computing technology requires intelligent system structures for context-awareness in ubiquitous computing environment. An intelligent system for context-awareness is based on agents, and need sensor information to recognize users and frames to support service. Therefore, this paper proposes the structure of 3-tier context-awareness processing server/client that can connect dynamically with each sensor and service, and support various context stably The structure of a proposal system is composed of a client class that recognizes uses' context information, a server class that processes realized context information by an application processing agent, and a management server that manages these two classes. Also, in this structure users information is composed of dynamic profile to support exquisite service.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.29-36
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• 2005

As computing environments are more rapidly developed, an adaptive and intelligent services using post PC such as PDA. Laptop, and Tablet PC in case of rounding and examining patients are highly demanded. The objective of this study is to design and implement a context-awareness support system based on voice service for medical environments. To achieve it, we propose a context middleware which plays an important role in recognizing a client with PDA by using a Bluetooth wireless communication technology as well as in executing an appropriate execution module, like delivery for diagnosis information of patients, according to the staff's context acquired from a context server. In addition, the context server functions as a manager that efficiently stores context information such as client's current status, physical environment, and device resources into a database server. Finally, for verifying the usefulness of the proposed system, we develop an application system which provides voice playing services for notification of other physicians through our context middleware.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.35-40
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• 2013

The messages on mobile terminal may contain context information such as user's location, time and preference. This paper proposes message forwarding system based on user's context. The server stores the predefined target addresses which may be mobile phone number, web server address and email address. On request for message transmission, the server tries to find a target address matching a user's context. Thus, a sender transmits messages to a representative address without knowing various receiver's addresses and a receiver can retrieve classified messages according to subject/location.

• Journal of Software Engineering Society
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• v.24 no.2
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• pp.47-54
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• 2011

Recently, smart phones are widely used and as the phone sensors are evolved, we can get more various kinds of data from them. Using the data, many researchers take an effort to aware user's situation and the context-awareness for smart phones are actively applied to the real-world applications. However, to make an advanced information from sensing data need complex processing and analyzing information. Some of these computing processes are fully handled on smart phone or some data are processed by transferring to server. In this paper, we proposed a method for reducing user's context data generated on smart phone and designed a context generator. As a result, we can reduce a transmission data size and save a communication cost.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1535-1538
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• 2002

본 논문에서는 컨텍스트 인식의 모바일 추천 시스템의 설계를 다룬다. 컨텍스트란 컴퓨터의 위치, 시각, 온도 등을 의미하며 컨텍스트 인식 컴퓨팅이란 이러한 정보들을 이용하는 컴퓨팅을 의미한다. 본 논문에서는 핸드폰이나 PDA와 같은 이동단말기에 GIS 센서가 부착되어 있다고 가정하고 이들 단말기를 통하여 위치정보를 수집한 후에 이를 이용하여 백화점과 같은 매장에서 고객에게 상품을 추천하여 주는 시스템을 설계하였다. 이동 단말기는 일정한 시간간격으로 자신의 위치를 서버로 전송하고 전송된 데이터는 데이터베이스에 저장된다. 저장된 데이터는 간단한 데이터 분석 알고리즘 통해서 단말기 사용자의 구매경향과 흥미도를 예측하여 이를 상품 추천 서버에 제공하고 상품 추천 서버는 이들을 바탕으로 사용자에게 최적의 상품을 추천하게 된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.355-358
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• 2010

모바일 환경이 발전하고 보편화됨에 따라 사용자의 상황정보를 인식하고 추론하여 서비스를 제공하는 상황인식 서비스에 대해 관심이 높아지고 있다. 상황인식 서비스는 사용자 및 주변 환경의 상황을 알아내고 공유하여 그에 맞는 서비스를 제공한다. 이를 위한 상황정보는 사용자의 요구와 주변 상황이 수시로 변화하는 이동통신 환경에서 중요하게 활용된다. 본 논문에서는 컨텍스트의 수집과 공유를 위해 안드로이드 기반의 컨텍스트폰 플랫폼과 컨텍스트 서버를 구현하여 사용자 상황 정보를 시각화 하고 서로 공유할 수 있게 하였다. 상황인식에 대한 연구에는 주로 위치 및 이동에 관한 연구가 많은 부분을 차지하고 있는데, 위치정보는 상황인식을 위해 반드시 필요한 정보이며 이를 통해 사용자의 현재 상황을 파악할 수 있는 중요한 정보로 활용되고 있다. 안드로이드 기반의 컨텍스트폰 플랫폼과 컨텍스트 서버, GPS를 이용하여 사용자의 위치를 추적하거나 찾아내어 실시간으로 상대방의 위치 정보와 사용자 간의 거리를 알아내어 공유하고 맵을 통해 사용자 위치를 파악하여 위치와 관련된 서비스를 제공하려 한다.

• Journal of Korea Multimedia Society
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• v.8 no.8
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• pp.1088-1098
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• 2005

Context-Aware is a one of the important researches in ubiquitous computing for providing optimal service to users by acquiring user's intentions and environmental information. Diverse researches are focused on the users and its environment facts for Context-Aware base and introduce a sensing based middleware which engages sever/sensor that operates identifier information to provide services. Context-Aware service which is limited by users and environment facts has the problem of overlapping sensing, unnecessary searching and anonymity of users. Also Server-Centric Context-Aware system requires very high cost to manage and operate the services. On this paper, We introduce Autogenous Context service model to simplify the Context-Aware process and design the middleware which performs decentralize management for Context-Aware information of user's portable devices to minimize problems which is occurred during the management and operation of existing Context-Aware system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.4B
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• pp.226-234
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• 2005

Context-Aware is the most important facts to reason a personalized and optimized service and to provide it to user. In the previous researches, user and surrounding environment were main facts of Context-Aware and middleware or center server has been proposed to support Context-Aware. In the daily space(for example, home, office, Car, etc), interactions between user and service can be a important facts of Context-Aware. In this paper, Context Autogenesis service model is introduced, simplified the Context-Aware process and designed the middleware which performs decentralize management for Context-Aware information of user's portable devices, so that problems occurred during the management and operation of existing Context-Aware system can be minimized and supporting user anonymity