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방광 측정을 위한 웨어러블 2-D 초음파 트랜스듀서 어레이 설계
정도영(Do Yeong Joung),조형근(Hyeong Geun Jo),편주영(Joo Young Pyun),박범훈(Bum Hun Park),박관규(Kwan Kyu Park) 한국비파괴검사학회 2021 한국비파괴검사학회지 Vol.41 No.1
본 논문에서는 의료용으로 사용되는 초음파 진단기에서 방광을 진단하기 어려운 환자들을 위해 착용이 가능한 형태로 진단기에 사용할 수 있는 트랜스듀서 설계를 다룬다. 넓은 영역을 조사하면서도 저가의 이미징 시스템에 적용하기 위해, 70 mm × 60 mm의 크기에 5 × 5 형태의 트랜스듀서를 제안하였다. 각 채널은 2 MHz의 중심주파수를 가지며, 주파수 특성을 이용한 해석을 통하여 이론 결과와 시뮬레이션 결과를 비교하였다. 해당 트랜스듀서는 PZT계의 압전소자를 사용하며, 좁은 대역폭을 갖고 있기 때문에 전, 후방에 정합층과 흡음층을 적용하여 대역폭을 증가시켰다. 같은 모델을 가지고 시간 영역 특성으로 분석한 결과를 주파수 특성과 비교하여 일치하는 것을 확인하였으며, 시뮬레이션을 통해 설계된 모델을 가지고 실제 제작한 진단기를 이용한 초음파 검사 시 실시간으로 환자들의 방광을 측정할 수 있는 가능성을 보여주었다. This paper presents the transducer design of diagnostic devices worn on patients with difficulty in bladder diagnosis using an ultrasound diagnostic device for medical purposes. A 5 × 5 transducer of 70 mm × 60 mm was fabricated to investigate a large area and apply it to an inexpensive imaging system. Each channel had a center frequency of 2 MHz, and the theoretical and simulation results were compared through analysis using the frequency characteristics. The transducer uses a PZT-based piezoelectric element and has a narrow bandwidth; thus, the bandwidth is increased by applying a matching layer and a backing layer at the front and back, respectively. The analysis results of the time domain characteristics of the same model were compared with those of the frequency characteristics. The model designed through simulation showed the possibility of measuring a patient"s bladder in real time through an ultrasonic examination using an actual diagnostic device.
김중선(Joong-Seon Kim),조형근(Hyeong-Geun Jo),왕덕현(Duck-Hyun Wang) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Force is a crucial element to be measured in various industries, especially the machine tool industry. Mega units of force are required in fields such as the heavy and ship industries. Micro/nano units of force are required for microparticles. The detection of force generates a physical transformation due to the force imposed from the outside, atlrnd electrical voltage signals are obtained from the system. For the detection of force, an octagonal ring load cell based on circular ring theory is designed and produced. To design the octagonal strain ring, theoretical values with data from the ANSYS program are compared to determine the size of the octagonal strain ring. An octagonal strain ring of the chosen size is made with the SCM415 material. The strain gauges are attached to the octagonal strain ring, designed to construct a full Wheatstone bridge. The LabVIEW program is used to measure the data, and strain values are found. With the octagonal ring load cell completed in this way, experiments are conducted by imposing forces on the tangential axis and radial axis. Experiments are performed to verify if the octagonal ring load cell conducts measurements properly, and theoretical values are analyzed to find any differences. The data will later be used in further research to develop a machine-tool dynamometer.
알루미늄 합금 6061에 대한 저항 점용접성에 미치는 전극 페이스 두께의 영향
김동철(Dong-Cheol Kim),조형근(Hyeong-geun Jo),김영민(Young-Min Kim),강문진(Moon-Jin Kang),황인성(Insung Hwang) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.1
Aluminium alloy sheets are being utilized in automotive parts such as hood, trunk, and tailgate. However, the spot welding of aluminium alloy has many problems, such as electrode sticking and expulsion, and therefore research on the resistance spot welding of aluminium alloy sheets is necessary. In this study, we evaluated the effects of electrode face thickness on the resistance spot weldability of aluminium alloy 6061. The two electrode face thickness conditions were compared, and the electrode face thickness was determined to be an important process variable that affected the spot weldability of aluminium alloy 6061.