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조성비에 따른 Pb[(Zr,Sn)Ti]NbO<sub>3</sub> 박막의 강유전 특성
최우창,최혁환,이명교,권태하,Choi, Woo-Chang,Choi, Hyek-Hwan,Lee, Myoung-Kyo,Kwon, Tae-Ha 한국센서학회 2002 센서학회지 Vol.11 No.1
Ferroelectric $Pb_{0.99}[(Zr_{0.6}Sn_{0.4})_{1-x}Ti_x]_{0.98}Nb_{0.02}O_3$(PNZST) thin films were deposited by a RF magnetron sputtering on $(La_{0.5}Sr_{0.5})CoO_3$(LSCO)/Pt/Ti/$SiO_2$/Si substrate using a PNZST target with excess PbO of 10 mole%. The crystallinity and electrical properties of the thin films with various composition ratio were investigated. The thin films deposited at the substrate temperature of $500^{\circ}C$ and the power of 80 W were crystallized to a perovskite phase after rapid thermal annealing(RTA) at $650^{\circ}C$ for 10 seconds in air. A PNZST thin films with Ti of 10 mole% showed the good crystallinity and ferroelectric properties. The remanent polarization and coercive field of the PNZST capacitor were about $20\;{\mu}C/cm^2$ and 50 kV/cm, respectively. The reduction of the polarization after $2.2{\times}10^9$ switching cycles was less than 10%. 강유전 물질인 $Pb_{0.99}[(Zr_{0.6}Sn_{0.4})_{1-x}Ti_x]_{0.98}Nb_{0.02}O_3$(PNZST) 박막을 10 mole%의 과잉 PbO가 첨가된 타겟을 이용하여 $La_{0.5}Sr_{0.5}CoO_3$(LSCO)/Pt/Ti/$SiO_2$/Si 기판상에 RF 마그네트론 스퍼터링 방법으로 증착하였다. Ti의 조성비를 변화시키면서 증착된 박막에 대하여 그 결정성과 전기적 특성을 조사하였다. 80 W의 RF 전력, $500^{\circ}C$의 기판온도에서 증착한 후, $650^{\circ}C$, 공기중에서 10초 동안 급속 열처리된 박막이 가장 우수한 페로브스카이트상으로 결정화되었다. 또한. Ti의 조성비가 10 mole%를 가지는 PNZST이 가장 우수한 결정성과 강유전 특성을 나타내었다. 이러한 박막으로 제작된 PNZST 커패시터는 약 $20\;{\mu}C/cm^2$정도의 잔류분극과 약 50 kV/cm 정도의 항전계를 나타내었으며, $2.2{\times}10^9$의 스위칭 후에도 잔류분극의 감소는 10% 미만이었다.
최우창 ( Woo Chang Choi ),이헌수 ( Hun Soo Lee ),서복남 ( Bok Nam Seo ),강위창 ( Wee Chang Kang ),정인철 ( In Chul Jung ) 대한한방신경정신과학회 2014 동의신경정신과학회지 Vol.25 No.4
Objectives: The purpose of this study is to examine the test-retest reliability and to suggest methods to enhance reliability. Methods: Participants consisted of 145 patients with generalized anxiety disorder who were diagnosed by the Structured Clinical Interview for DSM-¥³ Axis ¥° Disorders. Participants were tested twice within one week. Results: The test-retest reliability of the Instrument of Pattern Identification for Jing Ji and Zheng Chong was examined in 145 patients and it was calculated as 0.3919. Internal Reliability of each part was calculated as 0.320~0.502. Reliability and concordance rate of symptoms are presented in the table. Frequency of symptoms and correlation between weight and frequency are also presented in the table. Conclusions: Based on these results, we have modified the Instrument of Pattern Identification for Jing Ji and Zheng Chong.
우울증상에 대한 심리척도의 유용성에 대한 기초연구-비우울증, 화병과의 비교를 중심으로-
최우창 ( Woo Chang Choi ),김나현 ( Na Hyun Kim ),최승원 ( Sung Won Choi ),정인철 ( In Chul Jung ) 대한한방신경정신과학회 2013 동의신경정신과학회지 Vol.24 No.4
Objectives: The purpose of this study is to investigate the usefulness of psychological measurements in depression symptoms as compared with non-depressions and hwabyung. Methods: A total of 21 patients, who were diagnosed with depression and hwabyung, were evaluated by using the SCL-90-R, BDI, STAI, STAXI, ISI, HRSD, 20-Item Alexithymia Scale, BSDS and NEO-PI. Thereafter, they were statistically analyzed. Results: 1) In the results of SCL-90-R, the PST score group of hwa-byung group without depression was significantly higher when compared to the score from the depression group without hwa-byung. 2) In the results of NEO-PI, the NEO-PI-O score of hwa-byung group without depression was significantly higher when compared to the score from the depression group without hwa-byung. 3) In the results of 20-Item Alexithymia Scale, the total score and score of difficulty for identifying feelings scale from the depression group was significantly higher when compared to the score of non depression group. Conclusions: The results found are expected to serve as a useful resource for future studies when developing the instruments of oriental medical evaluations for hwa-byung.
ACM의 Sprague-Dawley Rat 경구 단회 투여 독성시험
최우창 ( Woo Chang Choi ),정인철 ( In Chul Jung ),임종순 ( Jong Soon Lim ),김승형 ( Seung Hyung Kim ),이상룡 ( Sang Ryong Lee ) 대한한방신경정신과학회 2012 동의신경정신과학회지 Vol.23 No.2
Objectives: This research investigates the single oral dose toxicity of ACM in SD rats. Methods: ACMs were administered to female and male SD rats, as an oral dose of 5000 ㎎/㎏. Animals were monitored for the mortality and changes in the body weight, clinical signs and gross observation during the 14 days after dosing, upon necropsy. Results: We could not find any mortality. Compared with the control group, significant weight change was not observed in the experimental group. First day after administration, compound-colored stool was observed in all rats. After the second day of administration, the more common symptoms were not observed. There were no gross abnormalities in all cases. [ED NOTE: highlight: given the context, this is very vague] Conclusions: The results obtained in this study suggest that the approximate lethal dose of ACM in both female and male rats were considered as over 5000㎎/㎏.
경호무도지도자의 리더십유형이 수련생의 운동 몰입 및 수업태도에 미치는 영향
최우창(Choi, Woo-Chang) 한국사회안전학회 2017 한국사회안전학회지 Vol.12 No.2
본 연구는 경호무도지도자의 리더십 유형이 수련생의 운동몰입, 수업태도에 구조적 관계를 규명함으로서 수련생의 운동몰입과 수업태도에 영향을 미치는지를 확인하는데 있다. 또한 연구의 결과를 바탕으로 경호무도를 활성화 할 수 있는 방안을 모색해보고자 한다. 본 연구에서는 2017년 서울, 경기, 인천지역에 거주중인 경호무도를 수련생 200명을 대상으로 경호무도 사회인구통계학적 특성 및 지도자의 리더십 유형, 수련생의 운동몰입, 수련생의 수업태도로 나누어진 연구 질문으로 하여 설문하였다. 설문지의 타당도 및 신뢰도를 검증하기 위해 전문가 회의를 거쳐 수정 · 보완한 후 SPSSWIN 20.0을 활용하여 요인 및 신뢰도 분석, 상관분석, 회귀분석 등을 수행하였고 최종적으로 다음과 같은 결론을 도출하였다. 첫째, 사회인구통계학적 특성은 리더십유형과 운동몰입 및 수업태도에 영향을 미친다. 둘째, 경호무도지도자의 리더십유형은 경호무도수련생의 운동몰입 및 수업태도에 영향을 미친다. 즉, 경호무도지도자의 리더십에 따라 경호무도 수련생들의 운동몰입과 수업태도가 높아진다고 볼 수 있다. This study aims to understand the effects of leadership types of security martial arts leaders on the excise flow and in-class attitude of trainees by investigating the structural relationships between them. It suggests how to invigorate security martial arts based on the result of the research. This study conducted a survey which consists of four sections: the demographic characteristics of security martial arts, a leader`s leadership type, a trainee`s excise flow, and a trainee`s in-class attitude. The questionnaires were distributed to 200 trainees of security martial arts in 2017 who resided in Seoul, Gyeonggi, or Incheon region. In order to verify the validity and reliability, the questionnaire was modified and improved through discussion with professionals. Factorial analysis, reliability analysis, correlation analysis, and regression analysis were conducted with SPSS WIN 20.0. From the result of the survey, this study concluded as follows. First, the demographic characteristics affect leadership types, excise flow, and in-class attitude. Second, the leadership types of security martial arts leaders influence excise flow and in-class attitude of security martial arts trainees. In short, the excise flow and in-class attitude of security martial arts trainees are enhanced by the type of a security martial arts leadership.
RF 마그네트론 스퍼터링 방법으로 제작된 Pb[(Zr,Sn)Ti]NbO3 박막의 결정구조와 전기적 특성
최우창(Woo Chang Choi),최용정(Yong Jung Choi),최혁환(Hyek Hwan Choi),이명교(Myoung Kyo Lee),권태하(Tae Ha Kwon) 한국센서학회 2000 센서학회지 Vol.9 No.3
N/A Pb_(0.99)(Zr_(0.6)Sn_(0.4)_(0.9)Ti_(0.1)]_(0.98)Nb_(0.02)O₃(PNZST) thin films were deposited by RF magnetron sputtering on (La_(0.5)Sr_(0.5))CoO₃(LSCO)/Pt/Ti/SiO₂/Si substrate using a PNZST target with excess PbO of 10 mole%. The thin films deposited at substrate temperature of 500 ℃, and at RF power of 80 W were crystallized to a perovskite phase after rapid thermal annealing(RTA). The thin films annealed at 650 ℃ for 10 seconds in air exhibited the good structures and electrical properties. The fabricated PNZST capacitor had a remanent polarization value of about 20 μC/㎠ and coercive field of about 50 kV/cm. The reduction of the polarization after 2.2 X 10^9 switching cycles was less than 10 %.