• 한국콘텐츠학회논문지
• /
• 제14권7호
• /
• pp.29-44
• /
• 2014

상황인지 서비스 제공을 위해서는 센서를 이용하여 사용자의 상황, 정황, 상태 정보를 추적하여야 한다. 하지만 센서에서 수집된 데이터는 시스템, 문법, 구조, 의미적인 측면에서 이질성을 가지고 있어 다양한 서비스에 재사용이 어렵다. 이를 위해 센서 데이터는 이와 같은 이질성을 제거하고 상황인지 서비스 제공에 용이한 컨텍스트 정보 형태로 처리 되어야 한다. 또한 기존의 상황인지형 서비스 정의 환경은 상황을 정의하기 위해 필요한 센서의 종류나 상황정보의 기준, 서비스 정의를 위한 프로그래밍 능력 등을 필요로 하여 일반적인 사용자의 이용이 어려운 실정이다. 따라서 본 논문에서는 IoT 패러다임을 통해 습득된 데이터를 이용하여 상황을 인지하고 사용자가 원하는 서비스를 제공하는 상황인지 IoT 서비스의 제공을 위한 온톨로지 기반 사용자 친화적 서비스 환경을 제안한다. 제안하는 환경은 센서 데이터를 컨텍스트 정보로 처리하는 온톨로지 기반 시멘틱 센서 데이터 처리 메커니즘과 사용자 친화적 서비스 정의 환경으로 구성된다.

• ETRI Journal
• /
• 제29권2호
• /
• pp.169-178
• /
• 2007

With the advent of ubiquitous computing environments, it has become increasingly important for applications to take full advantage of contextual information, such as the user's location, to offer greater services to the user without any explicit requests. In this paper, we propose context-aware active services based on context-aware middleware for URC systems (CAMUS). The CAMUS is a middleware that provides context-aware applications with a development and execution methodology. Accordingly, the applications based on CAMUS respond in a timely fashion to contextual information. This paper presents the system architecture of CAMUS and illustrates the content recommendation and control service agents with the properties, operations, and tasks for context-aware active services. To evaluate CAMUS, we apply the proposed active services to a TV application domain. We implement and experiment with a TV content recommendation service agent, a control service agent, and TV tasks based on CAMUS. The implemented content recommendation service agent divides the user's preferences into common and specific models to apply other recommendations and applications easily, including the TV content recommendations.

• 산업공학
• /
• 제21권1호
• /
• pp.65-74
• /
• 2008

In the future, the ubiquitous computing environment will provide users with context-aware services, intelligently interacting with omnipresent resources and surrounding environments at any location and time. Therefore, the ubiquitous computing environment requires context-aware applications in order to gather and analyze context information in various situations. However, existing context-aware applications have mainly focused on providing services and adapting themselves to users based on user related contexts. But this environment requires not only user related contexts but also Quality-of-Service (QoS) related contexts. In this paper we propose a frame-work for supporting user-oriented QoS in ubiquitous environments. The proposed approach adopts a semantic ontology and a neural network algorithm in order to reason about explicit and uncertain contexts. We also show the possibility of applying the framework to real environments such as collaborative engineering service, automobile maintenance service and ubiquitous home service.

• 대한산업공학회지
• /
• 제35권1호
• /
• pp.51-57
• /
• 2009

There are a variety of users and devices in a context-aware computing environment. In this environment, the service provided to a user may be the composition of diverse services rather than one independent service. Before user's devices provide the composite service to the user, they should perceive user's needs by gathering related information segments from other surrounding devices and/or sensors. We consider a context-aware computing environment providing composite and adapted service to users and propose an information processing model that characterizes the device where the collected data should be processed through services and/or applications. Based on this model, we provide an analytical tool to obtain some performance measures of the context-aware computing environment.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제4권2호
• /
• pp.174-190
• /
• 2010

In ubiquitous computing, invisible devices and software are connected to one another to provide convenient services to users [1][2]. Users hope to obtain a personalized service which is composed of customized devices among sharable devices in a ubiquitous smart space (which is called USS in this paper). However, the situations of each user are different and user preferences also are various. Although users request the same service in the same USS, the most suitable devices for composing the service are different for each user. For these user requirements, this paper proposes a device recommender system which infers and recommends customized devices for composing a user required service. The objective of this paper is the development of the systems for recommending devices through context-aware inference in peer-to-peer environments. For this goal, this paper considers the context and user preference. Also I implement a prototype system and test performance on the real ubiquitous mobile object (UMO).

• Asia pacific journal of information systems
• /
• 제14권3호
• /
• pp.121-144
• /
• 2004

Developing a personalized system on a user's behalf which is working around the Internet-based marketplace is one of the challenging issues in intelligent e-business, especially mobile commenrce. It has been highly recommended that such a mobile personalized system has to perceive the user's needs a priori by tracking user's current context such as location with activity and then to identify the current needs dynamically and proactively. Automatically and unobtrusively getting user's context is an inevitable feature for the development of autonomous mobile commenrce. However, personalization methodologies and their feasible architectures for context-aware mobile commerce have been so far very rare. Hence, this paper aims to propose a context-aware mobile commerce development methodology by applying agent and semantic web technologies for personalized reminder system, which is one of the mobile commerce support system. We revisited associationism to understand a buyer's need identification process and adopt the process as 'purchase based on association' to implement a personalized reminder system. Based on this approach, we have showed how the agent-based semantic web service system can be used to realize need-aware reminder system. NAMA(Need-Aware Multi-Agent), a prototype system, has been implemented to show the feasibility of the methodology and framework under mobile setting proposed in this paper. NAMA embeds bluetooth-based location tracking module and identify what a user is currently looking at through her/his mobile device such as PDA. Based on these capabilities, NAMA considers the context, user profile with preferences, and information about currently available services, to aware user's current needs and then link her/him to a set of services, which are implemented as web services.

• 한국컴퓨터정보학회논문지
• /
• 제13권4호
• /
• pp.205-211
• /
• 2008

기존의 상황 인식 서비스 모델에서는 리소스에 대한 접근 권한을사용자의 인증으로만 리소스에 대한 접근을 허용하였으나, 사용자의 주변 상황 정보가 빈번하게 변화하는 유비쿼터스 환경에서는 상황 변화에 따른 리소스 접근제어가 제공될 필요가 있다. 본 논문에서는 사용자의 상황 정보가 변경되는 경우에 따라 리소스에 대한 접근 권한을 동적으로 제어하고자 한다. 접근 제어는 기존의 CASA(Context-Aware Security Architecture)를 기반으로 하지만 현재 서비스를 받고 있는 사용자라 할지라도 리소스 접근 권한을 제한할 수도 있다. 즉, 주위 환경 정보를 실시간으로 검사하여 주위 환경에 따라 동적으로 접근 권한을 달리 부여하여 기존의 상황 인식 서비스보다 리소스에 대한 강인한 보안 서비스를 제공한다.

• 한국정보기술응용학회:학술대회논문집
• /
• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
• /
• pp.225-228
• /
• 2005

A context-aware services platform supporting mobile agents consists of sensor nodes and a sensor coordinator. Sensor nodes collect environmental information and transmit the collected information to the sensor coordinator through wireless sensor networks. The sensor coordinator passes the information to the context-aware service module, and the mobile agent. The context-aware service module or the mobile agent performs services suitable for a user's situation based on the environmental information and a service actuation message is delivered to an actuation node through the sensor coordinator. In this paper, we present a context-aware services platform structure employed in our project, and describe context-aware services platform interfaces with a context-aware service module and mobile agents.

• 경영과학
• /
• 제21권3호
• /
• pp.23-38
• /
• 2004

Recently the usage of mobile devices which enable the accessibility to Internet has been dramatically increased. Most of the mobile services, however, so far tend to be simple such as infotainment service. In order to fully taking advantage of wireless network and corresponding technology, personalized web service based on user's context could be needed. Meanwhile, optimization techniques have been vitally incorporated for optimizing the development and administration of electronic commerce. However, applying context-aware optimization mechanism to personalized mobile services is still very few. Hence, the purpose of this paper is to propose a methodology to incorporate optimization techniques into personalization services. Multi agent-based web service approach is considered to realize the methodology. To show the feasibility of the methodology proposed in this paper, a prototype system, CAMA-myOPt(Context-Aware Multi-Agent system for my Optimization), was implemented and adopted in mobile comparative shopping.

• 전자공학회논문지CI
• /
• 제42권5호
• /
• pp.49-58
• /
• 2005

상황 인식 기반 편재형 컴퓨팅(Pervasive Computing) 환경의 다양한 응용에 관심이 증대되고 있으며, 개발자들이 상황인식 응용을 보다 쉽게 개발할 수 있도록 지원하는 개발환경들에 대한 연구가 활발하게 이루어지고 있다. 서비스 관리 시스템은 상황 인식 응용이 필요로 하는 서비스를 찾아서 제공해 주는 시스템으로 상황 인식 응용 개발환경에 필수적인 부분이다. 그러나, 기존 연구에서는 단순 구문 매칭이나 서비스 타입 등의 제한적인 온톨로지 기반 매칭을 사용하고 있으며 상황 정보에 대한 고려가 없다. 또한, 사용자가 원하는 서비스가 없는 경우 기존 서비스들을 조합해서 이용할 수 있도록 할 수 있어야 한다. 이 논문에서는 상황 정보 기반 서비스 관리 시스템을 제안한다. 제안하는 시스템은 온톨로지를 이용한 의미적 매칭 방법과 상황 정보를 고려함으로써 보다 정확한 검색이 가능하게 하고, 서비스 조합 기능을 제공함으로써 사용자가 원하는 서비스가 서비스 레지스트리에 없는 경우에는 기존 서비스들을 조합하는 서비스 리스트를 제공할 수 있다. 설계한 시스템을 평가하기 위해서 서비스 질의를 위한 프로토타입을 개발하였으며 이를 통해서 상황 정보 기반 검색과 서비스 조합이 적절하게 지원함을 보였다.