Jeong-Wook Kim

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With the development of VoIP (Voice over IP) service, new security threats are expected to be appeared. However, existing IP network security solutions can not detect new VoIP specified network threats because they can not reflect characteristics of VoIP. In this paper, we propose a novel system that can monitor VoIP service and detect VoIP network threats(More)
Distance education has become an important method of extending education to populations that otherwise might be educationally neglected. Distance education in the private sector provides learners with more educational opportunities and widens the range of innovative services with a one-stop educational solution. With distance education, learners can(More)
SIP is able to support MH mobility at the application level using a redirect server. SIP, however, performs signaling on the basis of an open network, the Internet. Thus, it is exposed to security threats that do not exist in a closed network such as PSTN. Although much research concerning SIP security threats have been conducted, studies regarding security(More)
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