Won-Jun Jang

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The Open Directory Project (ODP) is a large scale, high quality and publicly available web directory utilized in many studies and real-world applications. In this paper, we explore training data expansion techniques for text classification as one of the possible directions to deal with the sparse characteristic of the ODP dataset. We propose a dozen(More)
Recently, the number of Internet banking transactions and e-financial services based on the public authentication certificate of smart-phones has rapidly increased. When using e-financial services by using the Android OS-based smart-phones, it is possible to experience the kind of problem related to the easy exposure of the user's personal information saved(More)
Mobile VoIP(mVoIP) Service on Smart work device provides both wide-area (cellular) access and local-area technology for Voice over IP services with a smart phone. Therefore, we should analyze the service security threat to solve security vulnerability of the SIP base mVoIP service in a wireless smart work environment. However, new problems and service(More)
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