• Journal of KIISE:Software and Applications
• /
• v.36 no.3
• /
• pp.200-207
• /
• 2009

U-Healthcare is more efficient as a solving method for health problems rather than visiting the hospital. Recently, systems have been studied to offer appropriate service to user, which gather and analyze biological signals of a user and context information around the user from a variety of sensors. The existing systems for U-Healthcare are based on domain specific service so it is difficult to expand and link to other systems. Also, they lack services focusing on the specific quality of the user, because they offer a general service which targets a lot of users. To address this problem, we expand an extensibility of system using the context-awareness agent based on multi-agents. Also, we provide the suitable services which match with the context information of user to each user using the modeling toolkit JaUCE based on GUI. We design and implement U-Silvercare service to demonstrate the effectiveness of the proposed context-awareness agent and modeling toolkit.

• The Journal of the Korea Contents Association
• /
• v.22 no.2
• /
• pp.1-9
• /
• 2022

To provide real-time traffic conditions, crowd sourcing based traffic information services in which users directly report and share traffic conditions are being developed. However, the existing traffic information service provides limited traffic conditions because it only shares information reported by specific service participants. In this paper, we design and develop a crowd sourcing based traffic information service that provides real-time traffic conditions by collecting direct reports from users and public traffic conditions. The proposed service allows users to directly report traffic conditions by voice and text, and collects and integrates traffic conditions published by external organizations. The collected traffic conditions are provided in real time through a push service, and new traffic conditions are transmitted when the user's location changes. The proposed service can report traffic conditions and share real-time traffic conditions through an Android app.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2009.01a
• /
• pp.433-436
• /
• 2009

유비쿼터스 컴퓨팅 환경으로 진화하면서 사용자의 상황정보를 이해하고 사용자의 상황에 적합한 서비스를 제공하고자 하는 연구들이 다양하게 진행되고 있다. 이러한 상황정보 서비스에 사용자의 의도를 반영함으로써 정확한 서비스 제공을 가능하게 하면서도 사용자가 서비스의 내용을 알 수 있도록 하기 위하여 Public Code라는 개념을 정의한다. 이를 이용하여 사용자의 의도를 해석하여 서비스를 시작하고, 의미 있는 서비스 제공을 위하여 사용자의 상황정보를 조합하여 이용함으로써 사용자 입장에서 직관적이면서도 편리한 서비스를 제공하기 위한 서비스를 제안한다.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2010.04a
• /
• pp.609-612
• /
• 2010

유비쿼터스 IT시대에 우리사회가 적절하게 대응하여 국민의 삶의 질을 향상시킴은 물론 새로운 성장 동력을 마련하는데 도움을 줄 수 있도록 u-City 서비스 개발에 대한 움직임이 강하게 일고 있다. 이에 본 논문에서는 u-City 내에서 발생할 수 있는 교통돌발상황에 대하여 시민들에게 편의를 제공 할 수 있도록 교통 돌발상황 대응조치 서비스에 관한 정의서를 작성 하였다. u-교통 돌발상황 대응조치 서비스의 주요 특징, 프로세스, 서비스 주요 기능을 정의하고, 비즈니스 모델 및 R&R, 시스템 구성을 분석 정의 하였다. 이 정의서를 통하여, u-Ctiy 내의 새로운 서비스 모델을 적용하고자 한다.

• Journal of Internet Computing and Services
• /
• v.7 no.5
• /
• pp.123-134
• /
• 2006

In this research paper, We have proposed an interpretation structure concerned with context-awareness which is essential to provide intelligent service. The proposed model has an interpretation structure that integrated information of both external and internal context, and been designed to keep independency between context information and application service. To verify the interpretation structure that proposed, we established a test bed (Ubi-Class) in which the concept of context awareness has been introduced to the existing class room, and constituted a scenario, and tested whether intelligent service is performed according to context interpretation.

• Journal of the Korea Society of Computer and Information
• /
• v.11 no.5 s.43
• /
• pp.105-114
• /
• 2006

Context-Awareness is a important technology to support optimized services automatically by recognizing various context informations in ubiquitous environments. Previous middlewares which supports ubiquitous environments used a centralized storage and DBMS to store and manage context informations and service contents. Centralized management of context informations and service contents sometimes hinders the autonomy of moving node and interoperability between difference middlewares. In this paper, we design the systems which stores context informations in moving node by distributed form and shares service contents between middlewares in distributed ubiquitous environments. And it provides Context-Aware scripts to supports the definition of context informations reasoning and execution of services. It verifies the usefulness of the designed systems by applying the scenario of music playing service based on context awareness

• Journal of Intelligence and Information Systems
• /
• v.13 no.1
• /
• pp.29-47
• /
• 2007

Acquiring context data in a timely and correct way is now regarded as one of the crucial characteristics of the proactive service which runs on ubiquitous computing environment. Moreover, context model should be well designed to provide a solid context-aware system. Since the ubiquitous computing systems aim to provide context-aware services everywhere with any available devices, legacy services which uses context models assuming single or limited domain should be extended enough to be useful even for multi-domain muli-services. This leads us to a motivation to build a generic context model with an appropriate type of model. Hence, the purpose of this paper is to propose a generic context model by assessing a variety of model types with a sort of evaluation measures.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.31 no.10A
• /
• pp.960-967
• /
• 2006

Mobile communication is evolving toward next generation system that is capable to provide ubiquitous human-centric services with giving no restriction on time and location. In particular, context-awareness will be realized using various sensors and devices and related technologies under the ubiquitous Next Generation (NG) mobile communications environment where user's demand and surrounding context are changing dynamically. By such context awareness, context aware service which provides best suitable services for a user by analyzing user's needs and situational information, will be one of the promising NG mobile services. In this article, we propose NG mobile service environment with focusing on generic service traffic flows supported by the NG service platform which gives various means of connecting users and service providers. Then, we propose evolutional phases of context-aware services based on ranges of context information and evolutional trend of telecommunication technologies and networking environment in NG mobile service environment.

• The KIPS Transactions:PartA
• /
• v.12A no.6 s.96
• /
• pp.485-492
• /
• 2005

Currently workflows in business processes and distributed computing environments have provided service automation by connecting many tasks with rules and/or orderings. The services in ubiquitous computing environments have to automatically provide users with adaptive services according to dynamically changing contort information, which is obtained from both the users and their environment. To adapt these workflows to ubiquitous computing, we must specify the situation information on the transition conditions. In this paper, we propose uWDL, Ubiquitous Workflow Description Language, based on Web Services to use the situation information on the transition constraints of workflow's services. uWDL can select adaptive services according to contexts, profiles, and events information, which are situation information. Furthermore, we verified the execution of a scenario document described with uWDL using the parser and the context handler for uWDL. The scenario developers can use the uWDL scenario editor for a design of scenarios, and they can easily specify the transition condition of the services according the situation information of ubiquitous environments using the uWDL.

• Journal of KIISE:Software and Applications
• /
• v.36 no.4
• /
• pp.283-290
• /
• 2009

Context-awareness is one of the key features of ubiquitous paradigm. A methodology that is specifying the relationships between the contexts and services needs to be developed to intelligently and sensitively deal with dynamic environment. The existing models on context-aware modeling are difficult to verify the correctness of models with respect to timeliness. In this paper we propose an approach which includes timing constraint in the relations of the context model, and verify its effectiveness using colored Petri-Net. Moreover, a context-modeling toolkit including context-awareness engine and simulator is developed to support agent-based context-aware service. The effectiveness of the proposed methodology is demonstrated using an example of Usilvercare.