Chih-Yuan Cheng

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In this paper, we propose a novel design of a GA-based output-feedback direct adaptive fuzzy-neural controller (GODAF controller) for uncertain nonlinear dynamical systems. The weighting factors of the direct adaptive fuzzy-neural controller can successfully be tuned online via a GA approach. Because of the capability of genetic algorithms (GAs) in directed(More)
This paper presents the design of a multimedia storage system for on-demand playback. The design stresses effective utilization of disk bandwidth with minimal data buffer to minimize overall system costs. The design procedure is most distinctive in the following two aspects: 1. It bases on a tight upper bound of the lumped disk seek time for the Scan disk(More)
This paper proposes a disk and file system design scheme that achieves effective utilization of disk bandwidth for retrieving MPEG-2 programs in a video-on-demand server. The scheme is based on a general two-level disk array architecture that exploits both parallelism and concurrency offered by fine-grain and coarse-grain disk array structures. This paper(More)
IEEE 802.16e devices may enter sleep mode to conserve energy. There has been some work studying how to schedule device's packet transmissions to maximize the device's sleep period while meeting associated QoS (quality of service) requirements. This paper proposes two schemes that attempt to save more energy by further reducing the frequency of transitions(More)
Follicular dendritic cell (FDC) sarcoma is rare and is classified either as conventional type or inflammatory pseudotumor (IPT)-like variant. Extranodal presentation is uncommon and nearly all gastrointestinal FDC tumors are of the conventional type. IPT-like variant tumors occur almost exclusively in the liver and spleen and are consistently associated(More)
This paper discusses disk system design that supports VCR-like interactive video-on-demand(VOD) with a good quality-of-service (QoS) guarantee. The guarantee of QoS is based on a practice that requires no higher data bandwidth to support a stream switching from the normal playback mode to a fast search mode while providing VCR-like visual feeling. The main(More)
This paper proposes a design procedure that exploits storage devices with diierent cost/bandwidth and cost/capacity ratios to build a hierarchical storage system for video-on-demand with minimum cost. The storage system is assumed to have two levels of hierarchy. The level-1 storage devices feature a low cost/bandwidth ratio and a high cost/capacity ratio.(More)
In this paper, we propose the so-called generalized relay mechanism to exploit semiconductor memory to upgrade the service capacity of video-on-demand servers. The design of the generalized relay mechanism is aimed at optimizing allocation and tradeoo of the memory resource and the disk bandwidth resource. It is expected that exploiting semiconductor memory(More)
IEEE 802.16e devices may enter sleep mode to conserve energy. There has been some work studying how to schedule device’s packet transmissions to maximize the device’s sleep period while meeting associated QoS (quality of service) requirements. This paper proposes two schemes that attempt to save more energy for a given sleep schedule by accelerating or(More)