Yonghee You

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Steganography is a technique to hide secret information in some other data (we call it a vessel) without leaving any apparent evidence of data alteration. All of the traditional steganographic techniques have limited information-hiding capacity. In this paper, we proposed a new method of the adaptive steganography using complexity on bit planes of color(More)
Haptic collaboration virtual environment (HCVE) is an enhanced virtual reality space with haptic interface support. HCVE users are connected together over the network and are able to work together by using sense of touch, i.e. haptics as well as audio and visual interfaces. In HCVE, the communication of haptic data is challenging because of time-varying(More)
Haptic Collaboration Virtual Environment (HCVE) is an enhanced virtual reality space that supports sense of touch, which is called " haptic ". In HCVE, remote users connected over networks are able to collaborate by sharing touching experiences in addition to well-established audio and visual interfaces. The success of HCVE largely depends on timely(More)
The mobile mapping system using the vehicle equipped the GPS, IMU, CCD Camera is the effective system for the management of the road facilities, update of the digital map, and etc. If the geographic information which is acquired by the mobile mapping system can be transmitted in real-time, users can process what they want using latest data. We have(More)
The adoption of vibration interfaces in the games and the virtual reality is increasing since they improve the user experience. The principle of existing vibrating devices is to vibrate when detecting the presence of particular frequency bands. However such frequency-based scheme, according to our survey, cannot meet the user expectation; they vibrate too(More)
This paper discusses the design and implementation of a geocomputing platform for the development of location-based services(LBS) focusing mobile mapping. During the analysis, design, and implementation of the geocomputing platform, an effective method was identified for the real-time processing of geographic information acquired by a camera attached to a(More)
In this paper, we mainly present the analysis on the haptic data transmission over real network conditions in a networked haptic collaboration environment. Since haptic data are produced at the rate of 1khz, the transmission of haptic data is extremely sensitive to packet loss, and time variation. We took some experiments for transferring haptic data under(More)
In this paper, we present the tactile effects of a sound-specific vibration interface. The sound-specific vibration interface generates vibration patterns with varying frequencies of sound by activating 16 oscillators in a 4times4 array within a set time frame. The main purpose of this paper is to analyze the effectiveness of this vibration interface(More)
The tactile effects of a sound-specific vibration interface is presented in this paper. The sound-specific vibration interface generates a vibration according to a sound stream using 16 oscillators arranged in 4 times 4 array. By setting time frame, we were able to generate various patterns of vibrations. So, the main purpose of this paper is to analyze the(More)