• Journal of Korean Society for Geospatial Information Science
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• v.18 no.3
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• pp.67-74
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• 2010

The aim of this paper is to come up with a methodology of migration for current transportation digital map in order to construct NDRM, which is the most essential map data for car navigation system. The model suggested through our study is able to efficiently produce navigable service map for route finding and guidance as well as to make the best of general road network developed by KOTI.

• Journal of Korea Multimedia Society
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• v.16 no.3
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• pp.342-353
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• 2013

The Internet has become a part of our lives. As the number of devices with Internet accessibility increases, users can use web services with those devices anytime, anywhere. Web contents on the web page can be delivered to user in various forms for various devices and users want to use seamlessly the contents with an appropriate device. Web browser extension is function to add features that are not supported by default browser. All browsers support extensions that provide the same services for cross-browser. In this paper, We proposed object migration architecture between heterogeneous browsers by expanding our proposed mechanism that identifies objects and the information of those objects to be migrated in the web page, extracts the object and creates object after migration. For this purpose, we analyzed the extension architecture of representative browsers and investigated necessary files to develop objects migration extension. In addition, We investigated how to send and receive message among files in each browser extension and the interaction mechanism among those files. Finally, We implemented the object migration mechanisms between heterogeneous browsers.

• Journal of Korea Multimedia Society
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• v.11 no.1
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• pp.106-116
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• 2008

It is difficult to provide Web services on a mobile environment because of the intermittent disconnection of a wireless network and the frequent change of context information. To resolve this, Web services must be migrate to devices, which can provide services to users seamlessly. However, researches on hosting, migrating, and replicating Web services on mobile devices are still in an early stage. This paper presents a lightweight Web service framework and an efficient method for establishing a policy of migrating Web services. Based on the WS-Policy standard, the proposed method defines a policy schema, which provides constructs for describing various kinds of contextual information. Specifically, the schema is designed to be extensible enough for different service providers to use different vocabularies to describe their policies. To show the validity, the proposed method for establishing a migration policy has been applied to our mobile Web services framework, resulting in a seamless provisioning of services.

• KIISE Transactions on Computing Practices
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• v.22 no.6
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• pp.278-283
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• 2016

Due to explosive increase in the amount of data produced recently, cloud storage system is required to offer high and stable performance. However, VM (Virtual Machine) migration may result in lowered storage service performance. Especially, in an environment where the host-side flash cache is used in a cloud system, the existing warmed up cache is lost and the problematic cold start begins at a new cache due to a VM migration. In this paper, we first demonstrate and analyze the cold start problem and then propose Cachemior (Cache migrator) which enables efficient hot start of the flash cache.

• Journal of Information Technology Services
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• v.6 no.1
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• pp.141-149
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• 2007

Sensor node's mobility brings new challenges to data dissemination in large sensor networks. Frequent location updates of sensor nodes can lead to both excessive drain of sensor's limited battery supply and increased collisions in wireless transmissions. Conventional studies for routing protocols in wireless sensor networks are not enough to cover energy consumption and migration of sensor nodes. This study proposes a dynamic routing protocol based on the SPIN considering energy consumption and the migration, and also shows the effectiveness of the proposed routing protocol.

• Journal of Korea Multimedia Society
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• v.14 no.7
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• pp.905-916
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• 2011

Recently, the W3C has developed the HTML 5 standard to provide various multimedia services as well as a web based streaming. HTML5 based web browsers with the built-in video codecs can be used directly for streaming services, though previous web browsers should contain playback plug-in for streaming services. In addition, an adaptive streaming technology using HTTP/TCP has been standardized, since an Internet firewall does not support RTP/UDP streaming protocol but HTTP/TCP streaming protocol. In this paper, we propose the service migration mechanism among various devices in the HTML5-based adaptive HTTP streaming environments. The proposed algorithm and architecture were modeled for migrating media flows, media flow control, and session control and implemented using JavaScript. Finally, we showed that the proposed mechanism was effective to migrate HTTP streaming service among various devices by performing several experiments.

• Journal of Korea Multimedia Society
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• v.11 no.8
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• pp.1179-1193
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• 2008

Recently, mobile devices enabled with Web services are being considered as equal participants of the Web services environment. The frequent mobility of devices and the intermittent disconnection of wireless network require migrating or replicating Web services onto adjacent devices appropriately. This paper proposes an efficient method for migrating and replicating Web services among mobile devices through code splitting. Specifically, the proposed method split the source code of a Web service into sub-codes based on users' preference to its constituent operations. The sub-code with higher preference is migrated earlier than others. The proposed method also replicates a Web service to other devices to enhance its performance by considering context information such as network traffic or the parameter size of its operations.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.40-42
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• 2003

무선 이동 환경에서의 멀티미디어 서비스를 안정적으로 제공하기 위해서 CDN을 적용할 경우, 중간 경로에 많은 부하를 주거나 사용자 요구 수준을 저하시키는 등의 문제점이 발생할 수 있다. D­MCDN은 사용자의 이동으로 최적의 서버가 변경되었을 경우, 새로운 서버로 연결을 재설정하는 session migration을 통해 이러한 문제점을 해결한다. 본 논문은 주변 에지 사이트와의 네트워크 지연 시간과 서버의 부하를 참조하는 session migration 알고리즘을 제시하고, 시뮬레이션을 통해 D­MCDN의 성능을 평가한다.

• Korea journal of population studies
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• v.22 no.1
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• pp.153-173
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• 1999

광역도시내 대도시와 신도시는 경제적인 유기체임에도 불구하고 임의적인 행정구역으로 분할되어 있다. 이 결과 대도시는 신도시 주민들을 위하여 막대한 재원을 투자하여 도시기반시설을 건설하여야 하나, 상주인구의 감소로 재원부족이라는 어려움에 빠지게 된다. 본 연구는 1990년 미국 센서스 1% 자료를 이용하여 53개 광역도시내 인구이동을 분석하여 대도시가 도시기반시설에 투자를 하면 할수록 신도시로 대도시 인구가 빠져나가는 "신도시 주민의 대도시 찰취가설"을 입증하였다. 결국 광역도시내에 상이한 지방정부가 존재하는 경우 지방정부서비스 공급은 티부이론이 제시하는 효율성을 달성하지 못하기 때문에 광역도시내 정부 서비스의 공급은 사무엘슨 방식의 통합적 제공이 필요하다. 제공이 필요하다.

• Journal of Korean Society of Forest Science
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• v.112 no.2
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• pp.230-247
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• 2023

This study was conducted on migrants in 5 cities and counties near the Jirisan Dulle-gil Trail, designated as a National Forest Trail, to find out how the National Forest Trail affects the quality of life after migrants from urban to mountain villages. The group that used the Jirisan Dulle-gil Trail before and/or after the migration showed higher levels of impact on the migration decision, life satisfaction, and behavioral intention than the group that did not use the trail. The group that was affected by the Jirisan Dulle-gil Trail in deciding on the migration also showed higher usage satisfaction with the Jirisan Dulle-gil Trail, life satisfaction, satisfaction with the migration, and behavioral intention than the unaffected group. There were also significant differences in the quality of life according to the migration area, location satisfaction among the migration satisfaction levels, and behavioral intention. In conclusion, it was confirmed that the Jirisan Dulle-gil Trail plays an important role in the decision to migrate to mountain villages and the quality of life after the migration. The results of this study are expected to be used as basic data to present policies related to National Forest Trails that can contribute to the development of mountain villages and countermeasures against population extinction in mountain villages.