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VLC4WoT : Visible Light Communication for Web of Things
( Mahmut Durgun ),( Levent Gökrem ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.4
Recently, new devices have been developed for the Internet of Things concept. The devices commonly use RF (Radio Frequency) based wireless communication. With the increase in the number of devices, the space allocated for the radio frequency band in wireless communication fills rapidly. Visible Light Communication (VLC) is an alternative, secure and economical communication technology that uses light instead of radio frequencies. While Web of Things (WoT) is the adaptation of the experience and knowledge acquired from the web into the internet of things ecosystems. By combining these two technologies, the development of the Visible Light Communication for Web of Things (VLC4WoT) system, which can use VLC and WoT technologies, has been our motivation. In our study, microcontroller control circuit was created for VLC4WoT system. Control of the circuits over the internet was performed. VLC based receiver and transmitter units have been developed for wireless communication. Web based interface was created for control. The test apparatus consisting of four objects with four outputs and a transfer unit was carried out. In this test, communication was achieved successfully. It was presented in the study that VLC can be used in the web of things architecture. In the future, it is envisaged to use this system as a safe and economical system in indoor environments.
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Ahmet Kilic,Mahmut Ulusoy,Emine Aytar,Mustafa Durgun 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
The synthesis and characterization of the mono- and multinuclear cobaloxime and organocobaloxime complexes bearing bidentate dimethyl glyoxime ligands are presented. All mono- and multinuclear cobaloxime and organocobaloxime complexes are used as catalysts for the cycloaddition of CO2 to various epoxides, especially epichlorohydrin, in the presence of 4-dimethylamino pyridine (DMAP) as a cocatalyst. In the catalytic applications, DMAP was a more active base with higher yield compared to other Lewis bases. Complexes (1) and (3), which have two dimethyl glyoxime per cobalt center (mononuclear complexes), are better catalytic systems than the corresponding multinuclear cobaloxime and organocobaloxime complexes (2–5) and (7–10) with two dimethyl glyoxime per cobalt center and one linked ligands per copper center. In addition, the organocobaloxime complex (6) showed the highest activity for the cycloaddition of CO2 with epichlorohydrin in the presence of 4-dimethylamino pyridine (DMAP) as cocatalyst. The used as catalysts mono- and multinuclear cobaloxime and organocobaloxime complexes were characterized by 1H and 13C NMR spectra, FT-IR spectra, UV–vis spectra, LC-MS spectra, molar conductivity measurements, melting point measurements and magnetic susceptibility measurements.
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