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- 저자 : 박범근 ( Buem-keun Park ) (검색결과 5 건)
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캔틸레버형 모듈을 이용한 광대역 압전 하베스터 개발 및 평가
박범근 ( Buem-keun Park ),백종후 ( Jong-hoo Paik ) 한국센서학회 2020 센서학회지 Vol.29 No.4
In cantilever type piezoelectric energy harvester, the amount of power generation decreases rapidly when outside a certain frequency. The thickness and weight of the cantilever metal plate were modified to develop cantilevers that could produce high power over a wide frequency range. The thicker the cantilever, the higher the power in the higher frequency range. As the weight of the mass increased, the cantilever tended to generate higher power, and the frequency band decreased. A 0.6 mm metal plate cantilever that had a mass of 3.3 g generated power that exceeded 3 mW within the 91-102 Hz range, with average and output values of 9.484 mW and 20.748 mW, respectively, at 99 Hz.
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고온 가압 적층 소결에 의한 황화아연 세라믹스의 광학성 특성
박범근 ( Buem-keun Park ),백종후 ( Jong-hoo Paik ) 한국센서학회 2021 센서학회지 Vol.30 No.3
During the manufacture of a ZnS lens with excellent transmittance in the mid-infrared region (3-5 μm) by the hot-press process, a single-layer sintering method is used in which one lens is manufactured in one process. Additional research is required to improve this single-layer sintering method because of its low manufacturing efficiency. To solve this problem, the variation in optical properties of ZnS lenses with change in sintering temperature was investigated by introducing a Stack sintering method that can sinter multiple lenses simultaneously. A carbon paper was placed between the molded lenses and sintered into five layers. The average permeability of 67% at medium infrared wavelengths of 3-5 μm was excellent under the following sintering conditions: pressure of 50 MPa and temperature of 850℃. This value is 1% less than the average permeability in the case of single-layer sintering of the ZnS lens. It was confirmed that the stack sintering method developed in this study can be used to manufacture a large number of lenses with excellent characteristics in a single process.
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박범근 ( Buem-keun Park ),신정희 ( Jeong-hee Shin ),백종후 ( Jong-hoo Paik ),이영진 ( Young-jin Lee ) 한국센서학회 2021 센서학회지 Vol.30 No.1
In this study, we successfully developed a highly reliable ultrasonic sediment sensor to detect the sediment levels in sewer pipes in harsh environments. The ultrasonic transducer employed in the ultrasonic sediment sensor was designed so as to possess a simple structure. The developed sensor was carefully optimized by simulating the electromechanical characteristics, radiated sound wave pressures, and directivity via finite element analysis. It was also designed to possess a simple mounting structure minimizing the flow disturbance in a 400-mm sewer pipe; additionally, eight ultrasonic transducers were arranged in a four-channel mode, allowing for measurement of the sediment height in five easy steps. Through experimental evaluations, we verified the performance of the ultrasonic sediment-level sensor and its industrial applicability. The results suggested that although the precision value was notably low at 15mm, the sediment detection performance was adequate; therefore, the developed sensor can potentially be used in industrial applications.
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박범근 ( Buem Keun Park ),김성미 ( Sung Mi Kim ),이영진 ( Young-jin Lee ),백종후 ( Jong-hoo Paik ),신정희 ( Jeong Hee Shin ) 한국센서학회 2021 센서학회지 Vol.30 No.5
Biochemical oxygen demand (BOD) and chemical oxygen demand (COD) methods are conventional analytical methods to analyze water quality. Both of these methods are technically indirect measurement methods, require complicated preconditions, and are timeconsuming. On the other hand, the total organic carbon (TOC) method is a direct and fast measurement method which is more intuitive and accurate than the BOD and COD methods. However, general TOC analysis methods involve complicated processes and high power consumption owing to the process of phase transition from liquid to gas by a high-temperature heater. Furthermore, periodic consumables are also required for the removal of inorganic carbon (IC). Titanium dioxide (TiO<sub>2</sub>) is one of the most suitable photocatalysts for simple processes. Its usage involves low power consumption because it only reacts with the organic carbon (OC) without the requirement of any other reagents and extra processes. We investigated a TiO<sub>2</sub> photocatalyst-based TOC analysis for simple and affordable products. TiO<sub>2</sub>-coated fiber substrate maintained under carbon included water was exposed to ultraviolet (UV) radiation of wavelength 365 nm. This method is suitable for the real-time monitoring of water pollution because of its fast reaction time. Its linear property is also sufficient to match the real value.
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수열합성된 황화아연 나노입자의 소결 압력에 따른 중적외선향상에 관한 연구
여서영 ( Seo-yeong Yeo ),박범근 ( Buem-keun Park ),백종후 ( Jong-hoo Paik ) 한국센서학회 2020 센서학회지 Vol.29 No.1
This study investigated the influence of various sintering pressures of ZnS nanoparticles prepared by hydrothermal synthesis performed at 220 °C for 20 h. The hydrothermally synthesized ZnS nanoparticles formed a cubic phase. The ZnS nanoparticles were sintered using a hot-press process at 850 °C for 2 h under pressures of 10, 20, 30, 40, 50, 60, and 70 MPa. The ZnS ceramics indicate the cubic phase is the major phase and the hexagonal phase is the minor phase. In the ZnS ceramics, as the sintering pressure increased, a decrement in the hexagonal phase was confirmed. When the sintering pressure equaled or exceeded 30 MPa, the transmittance and density improved with reductions in porosity and hexagonal phase. A sintering pressure of 60 MPa delivered the highest transmittance (69.7%).
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