• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.160-162
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• 2001

최근들어 모바일 환경에서 네트워크 자원을 효율적으로 이용하기 위한 에이전트 기술에 대한 연구가 활발치 진행되고 있으며 이미 많은 분야에서 모바일 에이전트 기술이 사용되고 있다. 그러나, 전자상거래와 같이 데이터 베이스 기능이 필수적인 분야에는 응용에 적합한 데이터베이스 프레임워크가 부족한 실정이다. 본 논문에서는 모바일 환경의 특성인 잦은 접속 해제, 부족한 배터리 용량, 낮은 통신 대역폭, 작은 저장공간 등과 같은 문제 기인한 데이터베이스 어플리케이션의 문제점을 알아보고, 이러한 단점으로 인해 발생되는 모바일 데이터베이스의 트랜잭션 문제의 해결책을 제안한다. Proxync는 분산 환경에서 유용한 프록시(Proxy)를 기반으로 하는 무선 데이터베이스 시스템으로 무선 데이터 동기화를 위해 SyncML이라는 언어를 사용한다. 프록시의 데이터 케쉬 기능을 이용해서 모바일 디바이스의 저장공간 문제를 해결하고 SyncML을 이용해서 접속이 끊어질 때 생길 수 있는 트랜잭션 문제를 해결 할 수 있도록 하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.33-42
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• 2012

Rapid evolution of wired and wireless technologies results in various types of embedded systems, and the software to be embedded into those devices now needs the flexibility rather than the fixedness which was well-known property for the embedded software in the past. Mobile agent is one of the useful distributed technologies of reducing network load and latency because of its disconnected operations and high asynchrony. In this paper, a component-based mobile agent framework, called EmHUMAN, is designed and implemented for structural embedding into the devices showing different functions and resource constraints. It consists of 3 layers of components. Based on those components, a structural embedding, considering resource constraints of required functions, amount of storage space, computing power, network bandwidth, ${\ldots} $ etc can be performed. The components in each layer can be extended with addition of new components, removing some components and modifying components. EmHUMAN plays the role of a framework for developing mobile agent based distributed systems. It is also a mobile agent system by itself. EmHUMAN provides several utilities as built-in API's, and thus high effectiveness in programming mobile agents can be achieved.

• The Journal of Korean Association of Computer Education
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• v.15 no.1
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• pp.55-64
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• 2012

The purpose of this study is to identify how realism of pedagogical agent can have impacts on persona effect and cognitive load factors. Eighty-two college students participated, and the independent variables of this study were the degree of image details and presence of gesture. The degree of image details were picture, illustration, and line-drawing. The $3{\times}2$ factorial design was applied. There was a significant interaction effect on the engaging of agent persona instrument. When the learners were under the condition of line-drawing agent without gesture, they showed the highest score on engaging of the agent persona instrument. Regarding the cognitive load factors, when learners under the condition of line-drawing showed the highest score of self-evaluation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.4
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• pp.658-667
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• 2009

NEMO (Network Mobility) introduces the concept of mobile router in order to supply users with group mobility over wireless and mobile networks. This paper investigates the advantages and disadvantages of NEMO in terms of the overhead of group mobility management. This paper proposes the additional requirements to enhance NEMO performance. Moreover, we analyze the main communication paths, CN-HA, HA-MR, and MR-MNN, in the real NEMO testbed.

• The KIPS Transactions:PartA
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• v.16A no.5
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• pp.339-346
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• 2009

In order to connect web services, clients generally should use heavy frameworks such as .Net framework and Java run-time environment, which require high performance hardware resources like a personal computer. Therefore, it is impossible for sensor nodes to handle web services due to their limited resources. In this paper, a client agent framework is proposed for dynamically connecting web services in the client node with limited resources. A client agent, which is managed by the framework in other server, has full capability for connecting web services, while a real client has a simple connection module with the client agent. In this framework, a client agent is dynamically generated using the WSDL in the web service server. By using the framework, sensor nodes or mobile devices can enhance their functionalities and services by accessing web services with minimum resources.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.280-283
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• 2014

최근 높은 성능을 갖춘 스마트 모바일 기기가 널리 보급되고 활발하게 사용되면서 다양한 지능적인 서비스에 대한 요구도 증대되고 있으며 그 가능성도 높아지고 있다. 하지만 이동 통신망의 통신 트래픽 과부하 문제는 해결해야 하는 문제점들 중 하나이다. 단말 간 직접 통신(D2D)은 기지국과 같은 기반 시설과의 트래픽을 분산시킬 수 있는 기술로 주목받고 있다. 본 논문에서는 스마트 에이전트 시스템을 통한 D2D 기반의 협력 프로토콜을 위해 에이전트의 기능을 효율적으로 기술할 수 있는 서비스 온톨로지를 설계한다. 제안한 서비스 온톨로지는 요구되는 서비스를 실시간의 상황에 따라 적합한 모바일 기기에 바인딩할 수 있는 근거가 됨으로써 기기 간의 효율적인 협력을 가능케 한다.

• Korea Information Processing Society Review
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• v.8 no.5
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• pp.111-118
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• 2001

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.4
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• pp.809-816
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• 2010

This paper proposed about a load-balanced multi-agent model in mobile distribution environment to monitor moving patients and to deal with a situation of emergency. This model was designed to have a structure based on distribution framework by expanding a mobile system, and provides healthcare services based on real time situational information on moving patients. In order to overcome the limitation of middleware when we design system, we provided an abstract layer between applications and their base network infrastructure so that balance between QoS requests and network life can be maintained. In addition, clustering was used in cells for the efficient load distribution among multi-agents. By using Clustering FCM, we got optimal resources and had solve about transmission delay.

• Journal of Convergence for Information Technology
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• v.9 no.2
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• pp.108-114
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• 2019

In this paper, we propose an intelligent vocabulary recommendation agent that automatically provides vocabulary corresponding to game-based learners' needs and requirements in the mobile education augmented reality game environment. The proposed agent reflects the characteristics of mobile technology and augmented reality technology as much as possible. In addition, this agent includes a vocabulary reasoning module, a single game vocabulary recommendation module, a battle game vocabulary recommendation module, a learning vocabulary list Module, and a thesaurus module. As a result, game-based learners' are generally satisfied. The precision of context vocabulary reasoning and thesaurus is 4.01 and 4.11, respectively, which shows that vocabulary related to situation of game-based learner is extracted. However, In the case of satisfaction, battle game vocabulary(3.86) is relatively low compared to single game vocabulary(3.94) because it recommends vocabulary that can be used jointly among recommendation vocabulary of individual learners.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.552-558
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• 2010

This is an example of ABSTRACT format. This study proposes a hypertension management system that implements a signal collision avoidance algorithm for RFID tags and enables accurate medical services for hypertension patients. The proposed system enables the mobile RFID reader to accurately recognize the RFID tag signals emitted from the patient by using OR logic. Moreover, the system adopts a multi-agent approach to provide and manage information on patient condition and automated medical service in a mobile environment.