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마이크로 가공 기술을 이용한 강유전체 박막 초전형 적외선 센서
최준임 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.4
Pyoelectric infrared detectors based on La-modified PbTiO3 (PLT) thin films have been fabricated by RF magnetron sputtering and micromachining technology. The detectors form Pb$_{1-x}$ La$_{x}$Ti$_{1-x}$ O$_{3}$ (x=0.05) thin film ferroelectric capacitors epitaxially grown by RF magnetron sputtering on Pt/MgO (100) substrate. The sputtered PLT thin film exhibits highly c-axis oriented crystal struture that no poling trealization for sensing applications is required. This is an essential factor to increase the yield for realization of an infrared image sensor. Micromachining technology is used to lower the thermal mass of the detector by giving maximum sensor efficiency. Polyimide is coated on top of the sensing elements to support the fragile structure and the backside of the MgO substrate is selectively eteched to reduce the heat loss. The sensing element exhibited a very high detectivity D* of 8.5*10$^{8}$ cm..root.Hz/W at room temperature and it is about 100 times higher than the case of micromachining technology is not used. a sensing system that detects the position as well as the existence of a human body is realized using the array sensor.sor.
최준일 대한의사협회 2015 대한의사협회지 Vol.58 No.12
After the enactment of the laws for special medical devices, quality assurance for medical imaging devices such as computed tomography, magnetic resonance imaging, and mammography has been widely performed in Korea and the results of quality assurance tests for these imaging devices also have been markedly improved. However, this is not the end. The ultimate goal of quality assurance for medical imaging might be the overall quality improvement over the whole process of imaging studies in medical fields. From this point of view, quality assurance of medical imaging has a long way to go. In this review, we will look some future perspectives of the quality assurance of medical imaging.
Preparation of supercapacitor using polymer electrolyte
최준,조봉상,김기영 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Supercapacitors are electrical energy storage device, which provided low cost, high power density, high cycle-life, large capacitance, high power delivery, fast charge-discharge rate, and mechanical robustness. Supercapacitors are used in a wide range of applications such as the hybrid electric vehicle, pulse power, memory protection, and medical equipment. The supercapacitors store electrical charge in an electric double layer at the interface between a high-surface-area carbon electrode and electrolyte. We produced structural supercapacitor with mechanical robustness made from carbon fiber/epoxy prepreg and composite solid polymer electrolyte. We prepared composite solid polymer electrolytes composed of poly (ethylene glycol) monomethyl ether acrylate, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, and inorganic fillers. The effects of characteristics of inorganic fillers on the thermal and electrochemical properties of composite solid polymer electrolyte were investigated.
최준일 대한의사협회 2020 대한의사협회지 Vol.63 No.3
Due to technological advances and the establishment of evidence-based medicine, radiological examinations are playing a crucial role in modern medicine, as a result of which they have been steadily increasing, and the rate of increase has intensified in the 2000s. Although this is a global phenomenon, the increase of radiological examinations in Korea is also high due to the introduction of the National Health Insurance Coverage Expansion Policy, so-called Moon Jae-in Care, for ultrasonography and magnetic resonance imaging. For accurate and rapid diagnosis of diseases, it is necessary for doctors to order appropriate radiological studies. However, the increase in radiological examination has created many problems, such as increased medical costs, decreased diagnostic accuracy due to radiologist burnout, and increased patient exposure to radiation. To reduce unnecessary imaging studies, a number of measures could be deployed including the development of clinical guidelines to select appropriate radiological examinations for each clinical situation.