• Information Systems Review
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• v.15 no.2
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• pp.91-110
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• 2013

Due to the intense competition and low switching cost, to find out which factors will significantly impact on user's continuance intention is very important for mobile instant messaging (IM) practitioners. In this study, we adopted network externalities and perceived service quality as independent variables based on the definition of mobile IM service. Network externalities also include direct externalities (referent network size) and indirect externalities (perceived complementarity). The result of this study shows that referent network size has a critical influence on perceived usefulness and perceived complementarity has a critical influence on perceived enjoyment; perceived service quality, as we expected, has significantly impact on not only customer's satisfaction but also perceived usefulness and perceived enjoyment. Meanwhile, both perceived usefulness and perceived enjoyment have directly critical influences on customer's continuance intention.

• Journal of KIISE:Information Networking
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• v.33 no.3
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• pp.257-268
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• 2006

In this paper, we have designed and implemented mobile instant messenger which has extensible presence service capability. Most previous work on instant messaging system has some limitation with regard to interoperability and extensibility. To solve these problems, we have employed the presence service architecture of IETF. In order to provide extensible presence capability in the wireless mobile communication, we have employed the presence service attributes which are defined in OMA's IMPS architecture. In particular, we have designed and implemented the presence service libraries for manipulating the presence information in response to user's requirement. finally, we have developed the wireless E-mail service, employing the presence service architecture, to verity the extensibility.

• 정보화사회
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• s.182
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• pp.42-43
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• 2006

먼 미지의 얘기로만 들리던 림의 '블랙베리' 서비스, 해외 출장을 다녀왔거나 외신을 자주 접하는 사람들 입에서 입으로 전해지던 것이 블랙베리였다. 휴대폰과 비슷하게 생겼지만 휴대폰은 아니고, 메일 확인을 목적으로 GSM방식으로 만 제공된다고 여겨지던 것이 블랙베리였던 것. 그러나 최근 국내 시장에도 이 서비스가 상륙했다. KT파워텔이 도입을 했다. 차이나모바일도 노키아와 손잡고 자국 시장에 블랙베리 서비스를 받아들였다. 대만과 일본도 하반기 도입을 예정하고 있다.

• Journal of Korea Multimedia Society
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• v.12 no.8
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• pp.1142-1154
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• 2009

The brand new type of mobile terminal services are kept being introduced in accordance with the development of mobile communication technology. Among many kinds of mobile application services, the PoC application standard which is using instant messaging service and group calls method with the existing walkie-talkie technology has been finished as the version 1.0 after tremendously active discussion and is being continued to be confirmed as 2.0 and 2.1. The PoC Box, which is discussed for replacing the PoC client and intermediate object as a voice messaging box, is currently being introduced and the biggest issues for PoC Box technology topics include the part of saved informations' processing and effective multimedia contents' transmission in the PoC Box system. In this research, we propose that the PaC client could effectively transmit the media to the end-user by specifying the playback location or range, focusing on the contents and the methods of dynamic controlling for saved media in PoC Box. This paper deals with the way of dynamic controlling method using the RTSP which is appropriate for PoC Box and the effective method for generation, expression, processing of various multimedia contents including audio and video objects.