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      저자 : Chien-Hsing Liao (검색결과 3 건)
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      • Mitigation the Impact and Survive from Extreme Drought of Climate Change and Global Warming

        Chien-Hsing Chu,Ching-yuan Lu,Chung-Yan Li,Fang-Lin Liao,Yu-Chi Lee 한국방재학회 2016 Journal of Disaster Management Vol.1 No.2

        Tap Water is the lifeline of human existence. Due to the effect of the Climate Change, the world has experienced an uneven distribution of rainfall in recent years, cause of floods or droughts. A series drought broke out in Taipei city gave chance to protect our county and test our reliabilities to citizen. This developments but has also realize the agricultural water should cooperate effectively shift dial [2], active water conservation ordinance relaxed, provide valuable water resources. Water utilities in response to the challenges of extreme drought, should face the New thinking that the difference between the price of water upon request, considering distinguish the dry season and the rainy season in different water, and the water does not hike the basic livelihood of the people; to consider the idea of building “Our sponge cities sponge Taiwan”; avoid low tariff wasted water, or the use of reasonable price adjustments after yearly, water problems can be solved in Taipei area; contributed to the dry season to strengthen water conservation and carbon reduction to achieve the effect or open consumptive water use of large household[2] and strengthen told: the key to sustainable development of water resources, “NO WATER NO FUTURE”.

      • KCI등재

        Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems

        Ze-Shin Lee,Mu-King Tsay,Chien-Hsing Liao 한국전자통신연구원 2009 ETRI Journal Vol.31 No.2

        Rain attenuation and intercell interference are two crucial factors in the performance of broadband wireless access networks such as local multipoint distribution systems (LMDS) operating at frequencies above 20 GHz. Power control can enhance the performance of downlink CDMA-based LMDS systems by reducing intercell interference under clear sky conditions; however, it may damage system performance under rainy conditions. To ensure robust operation under both clear sky and rainy conditions, we propose a novel power-control scheme which applies an adaptive neuro-fuzzy inference system (ANFIS) for downlink CDMA-based LMDS systems. In the proposed system, the rain rate and the number of users are two inputs of the fuzzy inference system, and output is defined as channel quality, which is applied in the power control scheme to adjust the power control region. Moreover, ITU-R P.530 is employed to estimate the rain attenuation. The influence of the rain rate and the number of users on the distance-based power control (DBPC) scheme is included in the simulation model as the training database. Simulation results indicate that the proposed scheme improves the throughput of the DBPC scheme.

      • KCI등재

        Efficient Channel Assignment Scheme Based on Finite Projective Plane Theory

        ( Chi-chung Chen ),( Ing-jiunn Su ),( Chien-hsing Liao ),( Tai-kuo Woo ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.2

        This paper proposes a novel channel assignment scheme that is based on finite projective plane (FPP) theory. The proposed scheme involves using a Markov chain model to allocate N channels to N users through intermixed channel group arrangements, particularly when channel resources are idle because of inefficient use. The intermixed FPP-based channel group arrangements successfully related Markov chain modeling to punch through ratio formulations proposed in this study, ensuring fair resource use among users. The simulation results for the proposed FPP scheme clearly revealed that the defined throughput increased, particularly under light traffic load conditions. Nevertheless, if the proposed scheme is combined with successive interference cancellation techniques, considerably higher throughput is predicted, even under heavy traffic load conditions.

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