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Mark Douglas Whitaker,신건철(Geon-Cheol Shin) 한국APEC학회 2020 Journal of APEC Studies Vol.12 No.2
The Commodity Ecology Mobile (CEM) platform is an online platform to enfranchise the world in its sustainable development. This is a review of the three major design decisions in this platform to reach cheaply and durably (1) all people, (2) all regions, and (3) all material uses to aid a clean circular economy. Respectively, it does this by (1) creating a long-term civic deliberation space taking advantage of the existing network value of over 5 billion mobile phones, (2) by using 867 ecoregions as a global yet detailed geographic space in which to debate and build such regional sustainable development, and (3) by using the Commodity Ecology model which is the most detailed framework of a circular economy with 130 different social uses of materials. The platform is recognized by the United Nations Academic Impact Office (UNAI) as an excellent way to achieve Sustainable Development Goal 12 (Encourage Sustainable Production and Consumption). The 17 Sustainable Development Goals (SDGs) will not be achieved by 2030 without a world strategy to enfranchise billions in their development. Mobile-accessible platforms and virtual communities can build real geographic community participation toward sustainable goals worldwide. Moreover, a strategy to achieve SDG 12 first uniquely catalyzes action on all other SDG goals. A conclusion discusses the technical and social plans of the project for the future.
Bandwidth enhancement of electro-optic sensing using high-even-order harmonic sidebands.
Lee, Dong-Joon,Whitaker, John F Optical Society of America 2009 Optics express Vol.17 No.17
<P>We demonstrate that the bandwidth of an electro-optic sensing system can be significantly enhanced by the use of even-order harmonic sidebands (order > 2) produced on an optical-carrier probe beam with two cascaded electro-optic modulators. The sensing frequency range may be routinely expanded by at least four times, with respect to the use of fundamental-harmonic sidebands, by enhancing the nonlinearity of high-order-harmonic electro-optic modulation. The creation of harmonic modulation sidebands up to the sixth order of the drive frequency on a laser-diode output is described analytically, as is photonic heterodyne down-conversion of microwave signals using these high-order even harmonics within an electro-optic sensor crystal. The nonlinear harmonics serve as beneficial local-oscillator modulations for broadband electro-optic detection of microwave fields without nonlinear distortion. Transverse near-field distributions from an 18.5 GHz patch antenna are extracted using the fourth- (sixth-) order-harmonic sidebands at the output of the cascaded electro-optic modulators driven with a 4.6- (3.1-) GHz continuous-wave input.</P>
Optimization of sideband modulation in optical-heterodyne-downmixed electro-optic sensing
Lee, Dong-Joon,Whitaker, John F. The Optical Society 2009 Applied Optics Vol.48 No.8
<P>Enhancements of the modulation depth in an electro-optic sensing application, through optimization of the modulation sidebands in both an electro-optic modulator and a microcavity electro-optic probe, have been investigated. The principles and methods of optimizing the operational bias points for the devices are described from the point of view of both an electro-optic modulator and probe, and their different optimum characteristics for signal-modulation depth, due to their huge scale gap, are presented. We use an optical-heterodyne receiver employing a fast modulator along with the electro-optic sensing technique to achieve high-frequency microwave electric field mapping. The practical limitations to sensitivity enhancement, solutions for compensating distortion, and combined optimization conditions for both electro-optic modulation and sensing are presented by exploring the evolution of field-mapping distributions.</P>