• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1340-1343
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• 2008

최근 인터넷기반의 멀티미디어 서비스의 발전에 힘입어 기존의 IP망을 코어 네트워크로 사용하는 이종망간의 통합서비스가 주를 이루고 있다. 이에 따른 사용자들의 요구로 고품질 멀티미디어 데이터 서비스 지원의 QoS와 멀티미디어 서비스를 끊김없는 이동성(Seamless Mobility)에 대해서 지원할 수 있는 핸드오버기법이 필수적이게 되었다. 이중 끊김없는 이동성 지원하기 위해 MIP(Mobile IP)기법이 제안되었고, 이를 향상시킨 FMIP(Fast Handover for. MIP), HMIP(Hierarchical MIP) 그리고 PMIP(Proxy MIP)까지 제안되었다. 본 논문에서는 IMS망의 P-CSCF의 SIP프로토콜과 PMIP핸드오버 기법을 연동하는 PTSA(PMIP To SIP Agent)를 두어 IMS망에서 적용할 수 있는 향상된 PMIP 핸드오버 기법을 제안한다.

• Review of KIISC
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• v.26 no.3
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• pp.22-29
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• 2016

최근 다양한 모바일 기기의 보급과 함께 향상된 모바일 컴퓨팅 환경으로 인해 게임서비스의 트렌드가 빠르게 모바일 환경으로 변화하고 있다. 그러나 모바일 게임서비스의 그 역사가 아직까지 길지 않아 보안 수준평가를 위한 점검항목들이 충분히 개발되지 못하였다. 이에 기존에 알려진 모바일 게임 관련 보안 취약점을 분석하여 게임 내 보안수준을 평가하기 위한 사전 점검항목을 열거해보도록 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.230-232
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• 2012

M2M 서비스는 센서 네트워크의 데이터 수집 및 제어를 넘어서는 새로운 타입의 서비스이다. M2M 서비스는 홈 네트워크 디바이스, 사용자의 스마트 디바이스, 개인 컴퓨터 등을 이용하여 스마트 환경의 감시, 관리, 그리고 제어 등을 제공하는 새로운 서비스 타입이다. 오늘날 M2M 서비스를 제공하기 위한 연구들이 진행되고 있는데, 이를 제공하기 위한 플랫폼 연구는 아직 많이 부족한 현실이다. 따라서 본 논문은 서비스 오버레이 네트워크를 이용하여 M2M 서비스를 제공하기 위한 플랫폼 구조를 제안한다. 또한 다양한 M2M 서비스들을 조합하여 새로운 서비스를 사용자에게 제공할 수 있는 서비스 컴포지션 방법 및 절차를 제안한다. 서비스 오버레이 네트워크 플랫폼을 이용한 M2M 서비스 플랫폼은 사용자에게 향상된 서비스 기능, 범용성, 호환성, 그리고 지능화 및 능동적 기능을 제공할 수 있다.

• Proceedings of the KHMA Conference
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• 2010.11a
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• pp.279-279
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• 2010

• 한국IT서비스학회:학술대회논문집
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• 2005.05a
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• pp.418-426
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• 2005

• The Journal of the Korea Contents Association
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• v.11 no.7
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• pp.21-29
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• 2011

U-health care services have been attracted to effectively solve some problems in promoting health and preparing aging society. Although the recent U-health care services have been developed to treat diseases, it requires environment information related to health for preventing fundamental diseases and for promoting health. In this study, a U-health environment service that reflects context recognition information is proposed. The proposed service draws environment information using local weather and healthcare information in users' residential areas. In the context recognition based U-health environment services, various services are provided to users not only health, living weather based menu, and exercise services but user location based warning messages for dangerous regions and remote emergency services. That is, based on such context recognition, some events that are to be occurred to users are detected and then it will provide proper services. Thus, it improves the satisfaction of U-health services and its service qualities.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.7 no.3
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• pp.89-97
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• 2012

The purpose of this study is to examine service quality elements in China Bank Industry and influence on service value, customer satisfaction and reuse intention. This study is composed one parallel comparison of documentary and evidential researches. To verify research model, the survey about medical institution and hospital services were conducted in Daqing of Heilongjiang Province, in China. Collected data was analyzed and the results are introduced in this paper. The findings ar as followed. This study has modified three-dimensional model of service quality: "interaction quality", "outcome quality" and "physical environment quality". Research was focused on investigating the direct effect of every service quality dimension on customer satisfaction. But "outcome quality "has only direct effect on service value, "interaction quality" and "physical environment quality" have not direct effect on service value in this study. Service value has direct effect on customer satisfaction and reuse intention. And customer satisfaction was the significant mediating role in the relationship of the service value and reuse intention.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.12
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• pp.907-917
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• 2006

In this paper, we propose a strategy to improve fault-tolerance and scalability of replicated services in mobile agent systems by applying an appropriate passive replication protocol for each replicated service according to whether the service is deterministic or non-deterministic. For this purpose, two passive replication protocols, PRPNS and PRPDS, are designed for non-deterministic and deterministic services respectively. They both allow visiting mobile agents to be forwarded to and execute their tasks on any node performing a service agent, not necessarily the primary agent. Especially, in the protocol PRPDS, after a backup service agent has received each mobile agent request and obtained its delivery sequence number from the primary service agent, the backup is responsible for processing the request and coordinating with the other replica service agents. Therefore, our strategy using the two proposed protocols can promise high scalability of replicated services a large number of mobile agents attempt to access in mobile agent systems. Our simulation results show that the proposed strategy performs much better than the one using only the traditional passive replication protocol.

• Journal of Digital Convergence
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• v.17 no.6
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• pp.159-167
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• 2019

This study was done to analyze the effect of logistics services, corporate image, product reliability and customer service on consumer satisfaction and repurchase intention that e-commerce users perceive. The survey was divided into "logistics services, corporate image, product reliability, customer services, customer satisfaction, repurchase intention". As a study result, independent variables such as corporate image, product reliability and customer services were found to affect customer satisfaction. Consumer Satisfaction had an effect on repurchase intention in mediated and dependent variable. In conclusion, in order to increase the repurchase intention in companies that introduced SCM, it was necessary to improve the corporate image, product reliability and customer service to satisfy consumers. Logistics services had not been adopted as an impact on customer satisfaction. We should strive to improve customer satisfaction and repurchase intention by creating a higher level logistics services.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2002.04a
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• pp.119-127
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• 2002

위치기반서비스(LBS: Location Based Service)는 점차 확대되어 가는 무선정보통신 환경을 통해서 지리정보와 특정목적의 컨텐츠를 결합, 제공하는 서비스이다. 이 글에서는 현재 국내에서 상용화되어 있는 서비스 사례와 함께 위치기반서비스의 기본적인 구성과 무선측위기술, 그리고 최근 기술동향을 정리하였고 기술발전과 함께 진행되고 있는 국내, 국제표준화기구의 표준화방안과 무선측위기술의 위치정확도 향상방안을 제시하였다.