Yong-Seok Kim

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In this paper, a noninvasive and accurate on-line estimation method for IGBT junction temperature is proposed. To optimize the heat management of IGBTs, it provides accurate information about junction temperature. The proposed method requires a few additional passive circuit components for the estimation and it can be easily incorporated into the(More)
In this paper, an efficient scheduling scheme is proposed to increase the available capacity of VoIP services over Evolved UTRA uplink. On top of the advantages of persistent scheduling, the proposed scheme adaptively share the resources of two VoIP users to get early-termination gain of dynamic scheduler. Through system-level simulations, the performance(More)
In this paper, we evaluate the capacity of voice over internet protocol (VoIP) services on high-speed downlink packet access (HSDPA), in which frame-bundling is incorporated to reduce the effect of relatively large headers in the IP/UDP/RTP layers. Also, the capacity of VoIP service on HSDPA is considered in a mixed voice and best-effort traffic scenarios.(More)
Despite the importance of seamless connectivity in ubiquitous computing, research for seamless connectivity is not considered properly. To provide seamless connectivity, this paper proposes intelligent contextaware handoff management scheme and middleware architecture. In this paper, we defined our own profiles about various contexts like user intentions as(More)
Abstract: In this paper, a novel anti-sway control system that uses an inclinometer as a sway sensor is investigated. The inclinometer, when compared with a vision system, is very cheap, durable, and easy to maintain, while providing almost the same performance. A number of observers to estimate the angular velocity of the load and the trolley velocity are(More)
In this paper, we evaluate the capacity of voice over internet protocol (VoIP) services over high-speed downlink packet access (HSDPA), in which frame-bundling (FB) is incorporated to reduce the effect of relatively large headers in the IP/UDP/RTP layers. Also, a modified proportional pair (PF) packet scheduler design supporting for VoIP service is(More)
SWCM aims to mitigate the adverse effects of interference at the physical layer by tracking the optimal maximum likelihood decoding performance with low-complexity decoding and minimal coordination overhead. This article reviews the basic structure of the SWCM scheme built on the principles of network information theory, and discusses how it can be extended(More)
This paper proposes a new vision-sensorless anti-sway control scheme, where the sway angle of the load is estimated with a simple acceleration sensor, which can be equipped on the trolley. The sway of the suspended load is suppressed by adding the damping factor, which is calculated with the estimated sway angle. While conventional electric anti-sway(More)