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초전형 적외선 센서용 P(VDF/TrFE) 막의 분극에 따른 유전특성의 변화
권성렬,김영우,배승춘,박성근,김기완 한국센서학회 2000 센서학회지 Vol.9 No.1
Dielectric characteristics of P(VDF/TrFE) film manufactured using spin coating technique have been investigated. To improve the crystallinity and quality of film, the film was three step annealed. Simple etching process and conditions for P(VDF/TrFE) film were established using top electrode as a mask. Poling is performed by several steps. 1.87 ㎛ thick P(VDF/TrFE) films were obtained with conditions such that the solution of 10 wt% concentration was spun at 3000 rpm for 30 seconds. Before poling, dielectric constant and dielectric loss of P(VDF/TrFE) film were 13.5 and 0.042, respectively. After poling, dielectric constant and dielectric loss of P(VDF/TrFE) film were 11.5 and 0.037, respectively.
권성렬,이현창,이규대,Kwon, Sung-Yeol,Lee, Hyun-Chang,Lee, Kyu-Tae 한국인터넷방송통신학회 2018 한국인터넷방송통신학회 논문지 Vol.18 No.3
본 논문에서는 센서 신호를 전류형태로 수신할 때 유리한 노튼 증폭기에서 전류 입력 시 발생하는 문제점을 분석하고 이를 개선하기 위한 회로를 제시하였다. 출력전압이 일정하게 유지되는 특성을 지닌 연산 증폭기로 구성된 버퍼회로의 출력을 전류의 입력단으로 활용하고, 이 때 버퍼회로에 흐르는 전원전류를 감지해 전류 입력단에서 유입되는 전류를 추출하도록 구성하였다. 제시한 회로의 성능을 확인하기 위해 회로를 구성하고 실험용 전류를 입력했을 때 나타나는 결과를 확인하였으며, 동일한 조건을 노튼 증폭기에 적용했을 때의 결과와 비교하였다. 비교 결과 기존의 노튼 증폭기에서 문제가 되었던 입력 오프셋 전압이 제시한 회로에서는 0V로서 제거되었고, 입력전류에 대한 출력전압의 평균오차는 무려 4.755%로 크게 줄어드는 등 전체적인 특성이 크게 향상되었음을 확인하였다. In this paper, an improved Norton amplifier is proposed and the problems caused by the current input in the Norton amplifier, which has advantages in current transmission, are analyzed. The output of the voltage follower consisting of an operational-amplifier with constant output voltage characteristics is used as an input terminal of the proposed circuit. It is configured to detect the power supply current passing through the voltage follower and extract the current from the input terminal. The performance of the improved Norton amplifier is verified at experiment according to the input current. The results are compared with conventional Norton amplifier. Consequently, the input offset voltage, which is a problem in the conventional Norton amplifier, was removed in the proposed circuit. In addition, the average error of the output voltage with respect to the input current was reduced to 4.755%. It is verified that the characteristics of the proposed circuit are improved.
TFELD 절연층을 위해 ITO glass 위에 증착시킨(Ba0.5,Sr0.5)TiO3 박막의 특성
권성렬,배승춘,박성근,김기완,김정환,최병진,남기홍 한국센서학회 2000 센서학회지 Vol.9 No.1
BST thin films were deposited on the ITO coated glass for using TFELD insulating layer by rf magnetron sputtering method: O₂/(Ar+O₂) mixing ratio was 10 %, substrate temperature was changed from R.T. to 500 ℃, and working pressure was changed from 5 mTorr to 30 mTorr. BST thin films deposited with various conditions were investigated electrical, optical, structural properties, and stoichiometry. The result of investigation was achieved good fabrication condition that substrate temperature of 400 ℃, and working pressure of 30 mTorr. Relative dielectric constant of 254 at 1 kHz, leakage current density was below 3.3 X 10^(-7) A/㎠ at 5 MV/cm applied electric field, and transmittance was over 82 % at visible range.
The Epidemiology and Treatment of Ankylosing Spondylitis in Korea
권성렬,김태환,김태종,박원,심승철 대한류마티스학회 2022 대한류마티스학회지 Vol.29 No.4
Ankylosing spondylitis is a chronic inflammatory disorder characterized by inflammation of the axial skeleton and sacroiliac joints and to a lesser extent by peripheral arthritis and the involvement of some extra-articular organs. It is paramount for the provision of effective health care delivery to be familiar with the epidemiologic studies on prevalence, mortality, and disability. Furthermore, there is no systematic arrangement of studies related to the treatment of ankylosing spondylitis in Korea. In this review, we addressed Korean ankylosing spondylitis epidemiological studies related to prevalence, genetic factor especially human leucocyte antigen-B27, extra-articular manifestations, infections, mortality, radiologic progression, child-birth, and quality of life. Furthermore, we reviewed Korean ankylosing spondylitis treatment researches about treatment trend, patients’ registration program called The KOrean College of Rheumatology BIOlogics and targeted therapy (KOBIO) registry project, biologics and biosimiliars, complications especially infections, and issues about bony progression. There would be value to further studying the epidemiology and treatment of Korean ankylosing spondylitis.
고주파 마그네트론 스펏터링법으로 제작한 ITO 박막의 특성
권성렬,김영진,최병진,박경빈,김기완 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Indium Tin Oxide(ITO) thin films have been fabricated by rf magnetron sputtering with a target of a mixture In_(2)O_(3) (90 wt%) and SnO_(2) (10 wt%). We prepared ITO films with substrate temperature of 30 to 300 ℃, and working pressure of 1 to under 0.1 m Torr. We analyzed electrical properties, X-ray diffraction patterns, SEM photographs and transmission spectra.
P ( VDF / TrFE ) 필름을 이용한 초전형 적외선 센서의 제작 및 특성
권성렬(Sung Yeol Kwon),김기완(Ki Wan Kim) 한국센서학회 1999 센서학회지 Vol.8 No.3
Pyroelectric infrared sensors have been fabricated using P(VDF/TrFE) film with pyroelectric effect. The weight percent and thickness of the poled P(VDF/TrFE) film are 75/25 percent and 25 fan respectively. For easier fabrication and connection method new top and bottom electrodes design was adapted for human body detecting pyroelectric infrared sensor. An aluminum infrared absorption electrode and bottom electrode were deposited by thermal evaporator. And the device was mounted in TO-5 housing to detect infrared light of 5.5 - 14 um wavelength. The responsibility, NEP (noise equivalent power) and specific detectivity D` of the device were 9.62 X 105 V/W, 3.95 X 10` W and 5.06 X 10?cm/W under emission energy of 13 ~ W/cmz respectively