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Design of Low Power All-Optical Networks with Dynamic Lightpath Establishment
Hirata, Kouji,Ito, Kohei,Fukuchi, Yutaka,Muraguchi, Masahiro The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
In multifiber all-optical networks, optical amplifiers are used for amplifying multiple optical signals with different wavelengths in fibers. An optical amplifier operates when any of lightpaths passes through it. Therefore, it should simultaneously amplify as many lightpaths as possible for efficiently utilizing its power. This paper proposes a dynamic lightpath establishment scheme considering the use efficiency of the optical amplifiers and the depletion of the wavelength resources in multifiber all-optical networks. The proposed scheme provides a routing and wavelength assignment strategy that reduces both the power consumption of the optical amplifiers and the blocking probability of the lightpath establishment. Through simulation experiments, we demonstrate the effectiveness of the proposed scheme.
Design of Low Power All-Optical Networks with Dynamic Lightpath Establishment
Kouji Hirata,Kohei Ito,Yutaka Fukuchi,Masahiro Muraguchi 한국통신학회 2016 Journal of communications and networks Vol.18 No.4
In multifiber all-optical networks, optical amplifiers areused for amplifying multiple optical signals with different wavelengthsin fibers. An optical amplifier operates when any of lightpathspasses through it. Therefore, it should simultaneously amplifyas many lightpaths as possible for efficiently utilizing itspower. This paper proposes a dynamic lightpath establishmentscheme considering the use efficiency of the optical amplifiers andthe depletion of the wavelength resources in multifiber all-opticalnetworks. The proposed scheme provides a routing and wavelengthassignment strategy that reduces both the power consumption ofthe optical amplifiers and the blocking probability of the lightpathestablishment. Through simulation experiments, we demonstratethe effectiveness of the proposed scheme.
Vibration Minimized Design of Trapezoidal Acceleration Input for Semiconductor Manufacturing Systems
Mitsuo Hirata,Tomohiro Harayama,Kouji Yoshida,Youzou Fukagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, we discuss about the design of the trapezoidal acceleration input which does not excite the mechanical vibration modes. We first obtain the spectrum of the trapezoidal acceleration input analytically, and the frequencies where the spectrum becomes zero are obtained. Since the zero spectrum frequencies are the function of the ramp-up and ramp-down time, they can be determined so as to coincide with the resonance frequencies of the mechanical vibration modes. The effectiveness of the proposed method is evaluated by simulations. The proposed method is very simple, and it is easy to apply not only to the stepper for semiconductor manufacturing systems but also to any other industrial systems that use trapezoidal acceleration input.