Taewoong Kim

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This paper addresses the problem of scheduling periodic messages in demand priority network standardized by IEEE 802.12 Committee. As regards the real-time property of the demand priority network, unnecessary blocking time due to its round-robin-based MAC protocol may cause periodic messages to miss their hard deadlines and result in low schedulability of(More)
In real-time control system, output jitter of a task is important when feedback control loops are implemented as execution of periodic tasks. Output jitter refers to the variation of response time of a periodic task. For the stability of the control system, output jitter should be reduced. This paper aims to reduce the output jitter of real-time tasks under(More)
In distributed real-time systems, a task activated periodically by the completion of its preceding task can be modeled as a periodic task with activation jitter. An activation jitter of a task is defined as the difference between the worst case and best case response times of its preceding task. Because current approaches assume that the best case response(More)
The amount of immutable files, such as images, video clips, audio files, and e-mail messages, is expected to grow significantly, as users actively generate, distribute, share, and re-use digital contents. In this paper, we present BeanFS, a distributed file system for a large number of immutable files. A key features of BeanFS include (1) the volume-based(More)
We propose a novel approach to recognize positive or negative emotions from acoustic signals in movies by extracting musical components such as tempo, loudness and melody and then by applying ANFIS Model with fuzzy clustering. In order to extract emotional features in acoustic signals, we first transform the sound into a spectrogram. The spectrogram(More)
In IEEE 802.12 network, a repeater arbitrates the network access contentions among the nodes on round robin basis. The node having received a grant from the repeater, can transmit a frame. The burst mode, a newly approved feature in IEEE 802.12 network, allows a node to transmit multiple frames per grant. This paper proposes a bandwidth allocation scheme(More)