The practical applications of piezoelectric ceramics are applied not only under low electric field environment. Therefore, an examination for characteristics of PZT ceramics under the high electric field condition can contribute to reducing the susceptibility of multifarious applications and to facilitating production of control circuits. These contributions can lead to the expansion of industrial applications. In this research, we fabricated disk-type PZT ceramic samples using conventional methods, measured the resonance characteristics of these samples under from low to high voltage conditions and calculated the PZT constants.

Recently, people's sensitivity to industrialization, external fine dust, and real life dust has increased substantially. As a result, the time during which people stay indoors using air cleaners has been gradually increasing. Therefore, systems to monitor dust concentrations and atmospheric environments in indoor environments where people reside are necessary. In this respect, in the present study, a system was developed that can monitor comprehensive indoor atmospheric environments by acquiring fine dust concentrations, temperatures, and humidity so that general users can easily identify the results. In addition, as kitchen utensils and electrical machinery and apparatuses are used indoors for long periods of time, the importance of fire-watching has been increasing. Therefore, in the present study, real time fire-watching was enabled by installing fire-watching and monitoring systems in indoor sections where fire may occur. Dust sensors, temperature and humidity sensors were used to determine dust concentrations and indoor air quality, Arduino microcontrollers were used to enable data acquisition and monitoring, and Raspberry Pi microcontrollers and image sensors were combined to implement fire-watching and monitoring systems.fire detection sensors. Diverse compound sensors were used to check atmospheric environments and Internet access was enabled through the mainboard of the fire-watching and monitoring system. The transmission of the dust concentration and atmospheric environment information measured through the foregoing and the transmission of fire images to the outside were also enabled so that IoT based fire-watching and home monitoring systems can be implemented.

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