Do-Hyung Kim

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This paper describes the vertical handover architecture with low latency handover for mobile terminals which supports interworking between heterogeneous networks. The vertical handover architecture defines handover-related modules for mobile terminal and the handover switching flows among them. We adapt low latency handover method to mobile IP for reducing(More)
In this paper, an algorithm for human head detection over a distance exceeding 2.5 m between a camera and an object is described. This algorithm is used for the control of a robot, which has the additional limits of a moving camera, moving objects, various face orientations, and unfixed illuminations. With these circumstances, only the assumption that human(More)
This paper describes a new robot photographer system which can interact with people. The goal of this research is to make the system act like a human photographer. This system is based on a mobile robot having capabilities of wireless communication and stereo vision. It recognizes waving hands of people, moves toward them, and takes pictures with designated(More)
The field emission behavior of base-model well-aligned carbon nanotubes (Base-CNTs), curled carbon nanotubes (Curled-CNTs), and tip-model well-aligned CNTs (Tip-CNTs) was examined. The nanotubes were fabricated by means of direct current plasma-enhanced chemical vapor deposition using different ammonia (NH 3) pre-treatment plasma currents. The turn-on(More)
The user authentication problem is discussed in the context of robot environments. Although authentication is indispensable for useful robot services, the traditional approaches that have been applied in strictly regulated environments cannot be applied as they are when both the robot and humans are freely moving around. In this paper, a new authentication(More)
This paper is based on our extensive surveys on human-robot interaction function methodologies and implementations, which are currently used in robotic products and research project in Japan and Korea. This specification defines a framework that can handle messages and data exchanged between human-robot interaction service components and service(More)
We propose the WLAN/HSDPA interworking architecture that enables us to interwork between HSDPA and WLAN. The WLAN/HSDPA interworking architecture defines the handover-related modules for mobile terminal and the handover switching flows among them. The proposed interworking architecture can be easily extended to support more than two heterogeneous networks.(More)