Kwangwoo Lee

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The online office is one of web application. We can easily use the online office through a web browser with internet connected PC. The online office has the advantage of using environment regardless of location or time. When users want to use the online office, they access the online office server and use their content. However, recently developed and(More)
Chien et al. (2009) proposed an e-will system on the Internet using an identity-based cryptosystem. They claimed that their e-will system was secure enough to be used in practice since their system conforms to R.O.C. (Taiwan) Civil Law. However, we found several problems of Chien et al.'s scheme. First, the Trust Authority knows or can easily compute the(More)
Indoor mobile robots are utilized more and more in modern lives. In order to effectively manipulate their activity, it is important to localize their position precisely. Although a number of different ways using several ultrasonic beacons were developed, these methods are restricted to a relatively small area because all the beacons should be localized(More)
In order to effectively manipulate indoor mobile robots, it is important to localize their positions precisely. Although a number of different ways using ultrasonic beacons have been developed, these methods are restricted to a relatively small area because all the beacons should be localized before any actual measurement. In this paper, a new methodology(More)
This paper investigates rainfall-induced landslides on partially saturated soil slopes using the 2011 Umyeonsan landslides at the center of Seoul, Korea. An integrated analysis of rainfall-induced landslide was carried out through laboratory tests, field tests, and numerical analysis. The results of comprehensive investigations in the Umyeonsan region(More)
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