• Journal of Information Technology Services
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• v.19 no.5
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• pp.107-124
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• 2020

Due to spread of covid-19, which began in December 2019, the usage of online distance learning has expanded within colleges. However, because of the lack of readiness for running online distance learning, professors and students had to experience a lot of inconvenience. In the near future, the usage of online distance learnig is expected to more expand, thus, it seems that there should be a strategies for sustainable online learning operations. This study aims to investigate which factors have impact on the continuance intention to usage of online distance learning of airline department students, focused on Post-Acceptance Model. For the empirical analysis, this study utilized a structural equation model after collecting 136 survey data. The results is as follow; First, user interface has positive impact on confirmation and confirmation has positive impact on satisfaction of online distance learning. Seconds, confirmation has positive impact on perceived usefulness, flow and social presence. Third, social presence has positive impact on satisfaction of online distance learning, but perceived usefulness and flow didn't have statistically meaningful impact on satisfaction. Finally, statisfaction of online distance learning has huge positive impact on continuance intention to usage. It is expected that the implications of this study enable colleges effectively to run online distance learning in preparation for the post-covid 19 era.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.145-151
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• 2014

If RCS-e subscribers and SMS subscribers want to exchange instant messages between each other, RCS-e app should know the presence information of the SMS subscribers. However, a RCS-e specification does not have the way to identify the information. This paper propose a software framework that makes RCS-e app can identify the information without having to modify RCS-e app. It describes the call flows between network equipments to manage the information. Also, it defines RCS-e service tags and service tuple for SMS subscribers. Performance evaluation proves that the proposed framework does not add loads to the existing network.

• Journal of Korea Technology Innovation Society
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• v.9 no.4
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• pp.740-758
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• 2006

This paper is related to the optimal pricing of Internet Backbone Services that are differentiated according to the size of the bandwidth required for applications with different quality sensitivities, Itdiscusses IBP (Internet Backbone Provider) optimal nonlinear pricing process in the presence of a congestion externality in addition to strategic behavior by users. In this scenario, the quality of service provided may reach its socially optimal level irrespective of strategic behavior by users and may be independent of the characteristics of the applications delivered over the Internet.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.16-20
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• 2007

SIP 기반 프레즌스 서비스는 향후 유비쿼터스 시대의 상황인지형 서비스를 비롯한 다양한 곳에 응용될 수 있는 핵심서비스이다. 또한 프레즌스 서비스는 개인의 프라이버시 문제를 다루기 때문에, 권한관리를 위해 draft로 제시되어 있는 XCAP 기반 기술이 주요 이슈로 대두되고 있다. 그러나, 현재 프레즌스 기반 구조를 활용한 응용서비스 모델이 제시되어 있지 않으며, XCAP 기반 권한관리 기술이 적용된 사례가 나와있지 않다. 본 논문에서는 VoIP에 적용 가능한 프레즌스 서비스 모델을 선정하고, 서비스 개발을 위한 프레즌스 기반구조의 적용방법, XCAP 기반 권한관리 기술의 적용방안을 설계하였다. 본 논문을 통해 중요한 서비스로 인식되면서도 마땅한 서비스가 발굴되지 않은 현실에서, 프레즌스 기반 서비스 개발 및 XCAP 기반 권한관리 기술개발을 위한 참조모델로 활용할 수 있다. 특히, 보안에 민감한 프라이버시 정보를 다루는 프레즌스 서비스 보호를 위해 XCAP 기반기술은 반드시 필요하며, 임의의 응용서비스에 독립적으로 적용할 수 있는 XCAP 기반기술의 특징을 고려하면 더욱 큰 의미를 지닌다.

• The Journal of the Korea Contents Association
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• v.4 no.1
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• pp.83-89
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• 2004

Instant messaging(IM) service is one of the useful communication means in the Intemet for exchanging simple messages between users. Usually, IM service is coupled with Presence service which provides status information of users. In this case, instant messages are sent and received directly between on-line users. Therefore, messages could not be exchanged when users are in off-line state. In this paper, We have implemented SIP based Instant Messaging System which includes message server that can store and manage instant messages. With this message server, messages could be exchanged legalness of user states. Furthermore, our system includes message waiting indication event package which provides useful informations about messages in the message server. And this system also includes the Caller Preference capabilities.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.582-584
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• 2005

폭발적인 인터넷 사용자 수의 증가와 더불어 다양한 서비스들이 생겨나고 있으며, 인스턴트 메시징과 프레즌스 서비스는 대다수의 인터넷 사용자들이 사용하고 있는 서비스일 것이다. 대부분의 인스턴트 메시징과 프레즌스 서비스는 독자적인 프로토콜을 사용하여 구현되어 왔기 때문에 서비스 간의 연동이 매우 어려운 실정이다. 본 논문에서는 이러한 문제를 해결하기 위하여 IETF(Internet Engineering Task Force)에서 개발된 표준 기술에 대하여 살펴보고, 이를 바탕으로 구현된 SIP 기반 IMPP 사용자 에이전트를 소개한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.539-541
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• 2005

인터넷 서비스 보급이 대중화됨에 따라 인터넷을 이용한 다양한 부가 서비스들이 창출되고 있다. 대부분의 인터넷 사용자들은 항상 누군가로부터의 관심을 갈구하기 마련이다. 메신저의 대화명이나, 미니 홈피 등을 통해 수시로 자신의 현재 심리상태를 표현하는것은 그 좋은 예라 할수 있다. 향후, 개발될 새로운 부가서비스는 이러한 사용자들의 현재 상태를 표현하기 위한 프레즌스 서비스와 통합된 형태로 발전해 나갈것으로 여겨진다. 본고에서는 현재 IETF를 중삼으로 진행되고 있는 SIP 기반 프레즌스 및 인스턴스 메시징 서비스에 대한 소개와, 사용자의 프레즌스 정보를 다양하게 기술하기 위한 프레즌스 고급 기능 표준기술도 함께 소개하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.77-82
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• 2016

Web developers have had difficulties in using Rich Communication Service-e(RCS-e) on their applications because of complicated protocols and closed interfaces. In order to vitalize the use of RCS-e, we need a RCS Application Program Interface(API) which has simple protocols and can be accessed easily. This paper presents the web-based Open API Framework for the RCS-e presence feature. A system architecture for the framework is defined. Call flows for the presence feature between the framework and other nodes are defined. Also, one of the call flows is illustrated to explain how to convert web-based requests to RCS-e requests. Finally, performance evaluation proves that the framework does not add any loads to the existing network infrastructure.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.25 no.3
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• pp.263-293
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• 2014

In this study, the operation condition of the U-library services is identified, and after confirming if there is any difference in the recognition from librarians, based on the results, the U-library services explore ways improvement plan to be operated reasonably. This study selected 10 local governments supported of the Ministry of Culture was performed in U-library services as a subject of study. Whether is any difference in the perception of librarians were measured according to demographic factors of librarians, presence or absence of work independency, employment pattern difference of librarians mainly operating U-library service as U-library services operating difference. For this study, united research methods (survey, visit, phone call) were used.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.951-954
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• 2005

IMPP service has been a promising technology as Internet grows fast and the requirements are increasing. IETF standardize requirements, model and data format for IMPP service via IMPP WG and SIMPLE WG. In this paper, we analysis SIMPLE WG in IETF and design consideration of XCAP server for IMPP services based on SIP.