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    A novel versatile modulator circuit
    (2009-05-01)
    Tuwanut, Panwit
    ;
    Koseeyaporn, Jeerasuda
    ;
    Wardkein, Paramote
    A novel versatile modulator that can operate either as a delta modulator, a sigma-delta modulator, an amplitude modulator or a frequency modulator is presented. The proposed circuit mainly composes of a few components: which are three OTAs, one capacitor and two resistors. Among these components, two OTAs and two resistor construct a Schmitt trigger network whereas the other OTA and a capacitor compose an integrator. The advantage of this circuit is that the clock (carrier) signal employed for modulation is inherent in the circuit. No external clock is needed, only the modulating signal is required for an input. With the compactness of the circuit, it is thus suitable for IC realization. The computer simulation based on CMOS technology demonstrates that the results agree well with the theoretical analysis. © 2008 Elsevier GmbH. All rights reserved.
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    Antecedents of intention to adopt the web-based computer aided facility management system
    (2008-01-01)
    Saengratwatchara, Supornchai
    ;
    Elsworth, Jeffery D.
    Computer aided facility management (CAFM) is a computerized network system that connects graphic and non-graphic information in a central and comprehensive source of facilities information. Previous studies have revealed that facility management (FM) professionals have been reluctant to adopt the CAFM application. Drawing on diffusion of innovations theory, a model was developed describing the relationships between intention to adopt the CAFM application and five characteristics of an innovation shown to lead to the intention to adopt. The purpose of this study was to examine factors that influence individual FM professionals to adopt the CAFM application. Eight hypotheses used to examine the relationship were supported. Perceived trialability, perceived visibility, and perceived result demonstrability positively related to intention to adopt the CAFM system indirectly through perceived relative advantage and perceived complexity, and perceived advantage and perceived complexity had significant effects on FM professionals' intention to adopt the CAFM application. © 2008 American Association of Family and Consumer Sciences.
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    Item type:Publication,
    A novel versatile modulator circuit
    (2005-12-01)
    Tuwanut, Panwit
    ;
    Koseeyaporn, Jeerasuda
    ;
    Wardkein, Paramote
    In this paper, a novel versatile modulator that can function either as delta modulator, sigma-delta modulator, amplitude modulator and frequency modulator is proposed. The principle of the proposed scheme is based on schmitt-trigger circuit and composed of a few components: three OTAs, one capacitor and two resistors. The advantage of this circuit is that the clock (carrier) signal employed for modulation is inherent in the circuit. The modulating signal is therefore an external input requirement. Based on the compactness of the circuit, it is suitable for IC realization. The computer simulation demonstrates the results which agree well with the theoretical analysis. © 2005 IEEE.