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Phongnawin Benprom,Chairat Pinthong,Somyot Kaitwanidvilai,Issarachai Ngamroo,Surachet Kanprachar 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Genetic algorithm (GA) has been shown to be an alternative for achieving suitable subcarriers in subcarrier multiplexing (SCM) on multimode fiber. Because of the relatively-flat frequency response at high frequency range of the multimode fiber, the suitable subcarriers can be determined by applying GA to many divided frequency ranges simultaneously; that is, Parallel GA. In this paper, parallel GA is adopted for searching suitable subcarriers in SCM on multimode fiber. Thirty suitable subcarriers, which are not located at any nulls in the frequency response of multimode fiber, are determined. These subcarriers are then used for transmitting many subcarrier signals through the high frequency bands of multimode fiber resulting in a total data rate of 15 times larger than the data rate obtaining from the 3-㏈ intermodal bandwidth.
Derivation of Zeros from Externally-loaded Feed-forward Element of Filter Network
Um, Keehong,Yoo, Sooyeup,Pinthong, Chairat The Institute of Internet 2014 International Journal of Internet, Broadcasting an Vol.6 No.1
We present a mathematical method for calculation of transmission zero locations, determining a filtering characteristics of two-port systems. By adjusting element values based on the zero locations, the frequency-selectivity is characterized. The characteristic polynomial of ladder networks in externally-loaded feed-forward systems is considered by adopting chain matrices for subsystems. This method can be extended to other types of lumped systems with cross-coupled sections. We find out the zeros by solving characteristics polynomials of closed-form expressions in terms of Laplace impedances of elements. The pairs of complex zeros are shown to be solely from the cross-coupled portion of the system.
Designing Flexible Thin Film Audio Systems Utilizing Polyvinylidene Fluoride
Um, Keehong,Lee, Dong-Soo,Pinthong, Chairat The Institute of Internet 2013 Journal of Advanced Smart Convergence Vol.2 No.2
In this paper, we develop a method to design a flexible thin film audio systems utilizing Polyvinylidene fluoride. The system we designed showed the properties of increased transparency and sound pressure levels. As an input terminal transparent oxide thin film is adopted. In order to provide dielectric insulation, a transparent insulating oxide thin film is coated to obtain double -layered structure. In the range of visible light, the output from the output of the system showed an increased and improved sound pressure level. The piezoelectric polymer film of polyvinylidene fluoride (PVDF) is used to produce mechanical vibration due to the applied electrical voltage signal. An analog electric voltage signal is transformed into sound waves in the audio system.
Designing Piezoelectric Audio Systems Using Polymer Polyvinylidene Fluoride
Um, Keehong,Lee, Dong-Soo,Pinthong, Chairat The Institute of Internet 2014 International Journal of Internet, Broadcasting an Vol.6 No.1
We develop a method to fabricate a flexible thin film audio systems using polyvinylidene fluoride(PVDF). The system we designed showed the properties of increased flexibility, transparency, and sound pressure levels. As an input port of two terminals, transparent oxide thin film with a low resistivity is adopted. In order to provide dielectric insulation, a transparent insulating oxide thin film is coated to obtain double-layered structure. In the range of visible light, the output from the output of the system showed a increased and improved sound pressure level. The piezoelectric polymer film of PVDF is used to produce mechanical vibration due to the applied electrical voltage signal. An analog electric voltage signal is transformed into sound waves in the audio system.