• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.488-494
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• 2013

For the activeness and autonomy of a sensor network, the efficient migration method of a mobile agent and the consistent naming services are the required components of a sensor network. Accordingly, this paper presented the implementation of backward migration of an active rule mobile agent applying the naming method based on RMI that used the meta_table including the informations about the components of a sensor network. This study implemented based on the extension of the forward migration[12], and the results of the various experiments present the efficacy of mobile agent middleware system and the possibility of constructing efficient sensor network application environment. And, the results of this study are able to enhance the adaptability on dynamic changes of environment in sensor network application development.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.121-123
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• 2003

무선 이동 통신은 눈에 띄는 성장을 해왔고 이에 발맞춰 새롭게 네트워크와 그에 따른 기술에 접근하고 있다 이러한 성향에 따라 사용자의 이동성을 지원하고 투명하게 서비스의 이동성을 지원하는 새로운 기술이 요구되어지고 있다 본 논문에서는 무선통신 네트워크상에서의 효율적인 서비스의 이동을 보장하는 새로운 메커니즘을 제안한다. 이러한 메커니즘은 서비스 이동성을 위한 컴포넌트 기반의 서버측 모델과 사용자의 이동성을 제공하는 센서 네트워크 상에서의 모바일 IP 기술로 구성된다.

• The KIPS Transactions:PartD
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• v.12D no.2 s.98
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• pp.289-302
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• 2005

The mobile agent has very various performance according to the element of communication number of times between hosts, quantity of transmission data agent's size, network state etc. specially, migration method is caused much effect in whole performance of distributed system. Most existing migration methods have simplicity structure that it moves doing to accumulate continuously result after achieving task by visiting host in the fixed order. Therefore, in case there are situation such as fault, obstacle, and service absence etc. This can be inefficient due to mobile agent increased network required time. In this paper, we design and implementation Multicast Migration Model for minimizing network required time by solving this problems. Multicast Migration Model includes components such as mobile agent including call module and naming agent, which provides object replication information and distributed server's location transparence. And we evaluate and compare with existing migration method applying prototype system to verify implemented migration model.

• Journal of the Korean Geographical Society
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• v.47 no.2
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• pp.268-281
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• 2012

In spite of the usefulness of migration statistics in spatially understanding social processes and identifying social effects of spatial processes, services and analyses of the statistics have been restricted due to the complexity of their data structure. In addition, flow mapping functionality which is a useful method to explore and visualize the migration statistics has yet to be fully represented in modern GIS applications. Given this, the purpose of this research is to demonstrate the possibility of flow mapping and the exploratory spatial analysis of the migration statistics in a Web GIS environment. For this, the characteristics of the statistics were examined from database, GIS, and cartographic perspectives. Then, O-D structure of the migration statistics was converted to spatial data appropriate to f low mapping based on the characteristics. The interface of Web GIS is specialized the migration statistics and provides exploratory visualization by allowing dynamic interactions such as spatial focusing and attribute filtering.

• Journal of Korea Multimedia Society
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• v.15 no.4
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• pp.540-551
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• 2012

Recently, the W3C has developed the HTML5 standard which gives the basis for providing various web applications on the web environments. Because of the advent of the smart devices and the broadband wireless network, users can accesse the web applications on the smart devices at anytime and anywhere. In addition, the demand on the multiscreen services, which enables users to use the appropriate device to their situation, has increased, since users have various smart devices. In this paper, we propose the grouping mechanism of web objects on the HTML5 based web platform, the extraction mechanism of the web object information which is used to create the web object on other devices, and the web object creation mechanism based on the received web object information. In addition, we propose the web service migration architecture between devices on the open web platform and implement the grouping, extraction and creation mechanism of the web objects on the test web document and generic web document with Chrome extension. Finally, we implement the delivery mechanism of the web object information between devices using the node.js and the WebSocket technologies.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1129-1131
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• 2011

최근 스마트폰, 태블릿 PC, 스마트 TV 와 같이 디스플레이 크기, OS, H/W 성능이 다양한 특징을 갖는 인터넷 커넥트 단말의 종류가 증가하고 하고 있으며, 웹 서비스 업체들은 기존의 각종 콘텐츠와 서비스를 융합하여 새로운 웹 서비스를 제공하고 있다. 개인 소유의 단말과 서비스가 증가함에 따라 사용자 단말간에 융합된 서비스를 자유롭게 이동할 수 있는 기술이 요구되었다. 하지만 서로 다른 특징을 같은 단말간에 seamless 한 서비스 이동이 어렵기 때문에, 이를 극복하기 위해 단말 제조업체, 통신 사업자들은 자사의 단말 또는 플랫폼 기반의 N-Screen 서비스를 제공하고 있다. 본 논문은 단말간 웹 서비스 이동에 있어 이동 가능한 객체를 정의하였으며, 서로 다른 특징을 갖는 단말과 플랫폼 기반에 구애 받지 않고 웹 기반의 서비스 이동을 위해 HTML5 의 Websocket 기술을 활용하여 사용자 단말간 서비스 이동이 가능함을 보였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.11B
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• pp.758-771
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• 2005

Information systems in current corporations are managing and storing large data officially happened on individual and various databases. Corporations for migrating the stored data from these individual databases are adopting with technologies of EAI, MDR, DW etc.. However these technologies are not only required to expenses introduction charge and maintenance cost but also have problems of heterogeneous environment required per each vender In this paper, to solve problems of these current existing technologies, we propose to design our data migration system to migrate source data and semantic constraint condition between heterogeneous relation databases based on web service. As corporations use web services, they can reduce introduction expense and maintenance cost because of using current existent web environment. Each system can independently migrate XML based data against any platform, system environment, and Implementation language.

• KIPS Transactions on Computer and Communication Systems
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• v.10 no.12
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• pp.311-318
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• 2021

With the rapid development of the Internet of Things(IoT) technology recently, multi-access edge computing(MEC) is emerged as a next-generation technology for real-time and high-performance services. High mobility of users between MECs with limited service areas is considered one of the issues in the MEC environment. In this paper, we consider a vehicle edge computing(VEC) environment which has a high mobility, and propose a task migration algorithm to decide whether or not to migrate and where to migrate using DQN, as a reinforcement learning method. The objective of the proposed algorithm is to improve the system throughput while satisfying QoS(Quality of Service) requirements by minimizing the difference between queueing delays in vehicle edge computing servers(VECSs). The results show that compared to other algorithms, the proposed algorithm achieves approximately 14-49% better QoS satisfaction and approximately 14-38% lower service blocking rate.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.302-308
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• 2013

Internet is becoming more common with increasing cloud services have been spreading rapidly. A SLA is agreements between service providers and customers of service providers is how to ensure quality of service. SLA in cloud computing environments from the perspective of the IT service providers to customer satisfaction increase for service quality, it will need to differentiate between competing carriers QoS guarantees with SLA is a very important factor. However, the study of SLA in the cloud is staying in its infancy. In this paper, SLA indices for cloud services defining and use them SLA Management System for QoS guarantee has been implemented. The proposed system using monitoring-based migration policy an open source-based cloud computing platform which Cluster Nodes load distribution of virtual machines assigned to their availability, response time, throughput analysis of what affects and is compared with existing cloud.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.424-428
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• 2006

유비쿼터스 환경에서 사용자는 언제 어디서나 원하는 서비스를 제공받을 수 있어야 한다. 이를 위해, 사용자는 데스크탑, 노트북, 그리고 PDA와 같은 다양한 디바이스들을 이용하여, 사용자가 원하는 서비스를 특정 상황의 제약 없이 끊임없이 제공받을 수 있는 기술이 필요하다. 우리는 유비쿼터스 환경의 사용자에게 끊임없는 서비스를 제공하기 위하여 재구성 시스템과 시나리오를 설계 및 구현하였다. 재구성 시스템은 상황에 맞는 서비스를 제공하기 위한 최적의 디바이스를 선택할 수 있다. 또한 실행중인 서비스를 새로 선택한 최적의 디바이스에서 실행하는 서비스의 이동이 가능하다. 본 논문의 시나리오에서는 음악 서비스를 실행 중인 디바이스로부터 사용자가 지속적인 서비스를 제공받지 못할 경우, 변화된 상황에 따른 최적의 디바이스로 이동하여 사용자에게 기존의 음악 서비스를 지속적으로 제공할 수 있음을 보여준다.