Effects of Humidity on the Microstructure and the Ferroelectric Properties of Sol-Gel grown P(VDF-TrFE) Films

Young Joon Ko,진다운,Dae Sol Kong,Jong Hoon Jung 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.4

We report the microstructure and the ferroelectric properties of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films grown under various humidity conditions and synthesis times by using a sol-gel method. When the synthesis time under a humid condition was short (approximately 30 min), the moisture in the environment affected only the surface morphology without any loss of ferroelectricity for the P(VDF-TrFE) films. In contrast, when the synthesis time was long (approximately 90 min), the moisture strongly affected the microstructure and the ferroelectric properties of P(VDF-TrFE). The transparent P(VDF-TrFE) film became opaque at high humidity. Scanning electron microscopy revealed numerous pores on the surface of and inside the film. The pores reduced the Young's modulus considerably from 4.15 to 0.97 GPa for the films grown at 20 and 80% relative humidity, respectively. In addition, the ferroelectric hysteresis loop disappeared at humidities above 60%. This work provides upper limits for the humidity and the synthesis time for the growth of high-quality P(VDF-TrFE) films by using a sol-gel method.

Localization of Antigenic Sites at the Amino-terminus of Rinderpest Virus N Protein Using Deleted N Mutants and Monoclonal Antibody

Kang-seuk Choi,Jin-ju Nah,Young-joon Ko,Shien-young Kang,Yi-seol Joo 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

of Antigenic Sites at the Amino-terminus of Rinderpest Virus N Protein Using Deleted N Mutants and Monoclonal AntibodyKang-seuk Choi*, Jin-ju Nah, Young-joon Ko, Shien-young Kang1 and Yi-seok JooNational Veterinary Research and Quarantine service, Ministry of Agriculture and Forestry, 480 Anyang, Gyounggi 430-824, Korea1Research Institute of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University, 48 Gaeshin-dong, Heungduk-gu, Cheongju, Chungbuk 361-763, KoreaReceived April 2, 2003 / Accept July 10, 2003J. Vet. Sci. (2003), 4(2), 167-173JOURNAL OFVeterinaryScience*Corresponding author: Kang-seuk Choi National Veterinary Research and Quarantine service, Ministry of Agriculture and Forestry, 480 Anyang, Gyounggi 430-824, Korea Tel: +82-31-467-1860, Fax: +82-31-449-5882 E-mail: choiks@nvrqs.go.kr

Assessment of Alcohol Level in Inebriated Victims of Sexual Assault using Ethyl Glucuronide

Young?Hoon Jo,Mia Kwon,Joon-Bae Lee,Jeong A Ko 한국분석과학회 2022 학술대회논문집 Vol.2022 No.5

디지틀 QAM시스템과 아날로그 FM시스템간의 干涉影響

고봉진,강영흥,조성준 한국항공대학교 1989 論文集 Vol.27 No.-

본 논문에서는 DIV시스템에서의 디지틀 QAM 시스템과 아날로그 FM시스템 상호간의 간섭 영향에 대해 고찰하였다. 먼저 아날로그 FM 시스템과 디지틀 QAM시스템 상호간의 간섭환경하에서 디지틀 QAM신호의 오율식과 아날로그 FM신호의 기저대역에서의 신호대 간섭잡음 전력비(SNR)에 대한 일반식을 유도하여 그의 계산결과를 반송파 대 잡음 전력비(CNR), 반송파 대 간섭파 전력비(CIR), 정규화 반송파 주파수차(X)를 함수로 하여 그래프에 나타내었다. 같은 무선주파수 대역내에서 디지틀 QAM시스템과 아날로그 FM 시스템이 공존하기 위한 각 함수의 수치값을 그래프로부터 구할 수 있었다. The mutual interference effects between analog FM system and digital QAM system have been analyzed and discussed under DIV system. At first, the error rate equation of digital QAM signal and the baseband signal to interference noise ratio(SNR) equation for analog FM signal have been derived in environment of noise and mutual interference. And the numerically calculated results are shown in graphs as functions of carrier to interference ratio(CIR), carrier to noise ratio(CNR), normalized carrier frequency separation(X). From the graphs, numerical value of each function can be obtained for the coexistance of analog FM system and digital QAM system in a same radio frequency band.

PCS 단말기용 유전체 공진기 대역 통과 필터의 설계 및 제작

고영준,김종현 광운대학교 신기술연구소 1998 신기술연구소논문집 Vol.27 No.-

본 논문에서는 유전체 공진기와 캐패시터 또는 인덕터를 사용하여 원하는 주파수 대역에서 감쇠극을 갖는 대역 통과 필터를 설계 및 제작하였다. 이때, λ/4 TEM mode 세라믹 유전체 공진기를 사용하였으며 필터 설계시 유전체 공진기는 종단이 단락된 전송선로로 해석하였다. 필터의 통과대역은 1800~1825 MHz 이고 측정결과 필터의 중심 주파수. 대역폭 및 감쇠극의 주파수가 설계치와 일치하였다. In this paper. a band pass filter with attenuation poles in the desired frequency range was realized using series capacitor or inductor and dielectric resonator. And ceramic dielectric resonator which modeled as a transmission line with a shorted termination was used. The measured center frequency. bandwidth and attenuation frequency values closely agree with the design values.

병원간호직 근무자의 근속성향 결정요인

서영준,고종욱 한국병원경영학회 1997 병원경영학회지 Vol.2 No.1

This study purports to investigate the determinants of propensity to stay among nursing staff working at Korean hospitals. The independent variables contains three groups of determinants : environmental variables(job opportunity, spouse support, and parent support), psychological variables(met expectations, work involvement, positive affectivity, and negative affectivity), and structural variables(job autonomy, work unit control, routinization, supervisor support, coworker support, role ambiguity, role conflict, workload, resource inadequacy, distributive justice, promotional chances, job security, job hazards, and pay). The sample used in this study consisted of 329 nurses and 175 nurse aides from two university hospitals in Seoul and its surburbs. Data were collected with self-administered questionnaires and analyzed using path analysis. The results of this study indicate that : (1) the following variables, listed in order of size, have significant positive effects on propensity to stay among hospital nursing staff : job satisfaction, met expectations, supervisor support, job security, and positive affectivity, (2) the following variables, listed in order of size, have significant negative total effects on propensity to stay among hospital nursing staff : job opportunity, negative affectivity, and rutinization, (3) the model explains 44.2 percent of the variance in propensity to stay among nursing staff working at two university hospitals, and (4) managerial support for improving the job autonomy, distributive justice, and promotional opportunity for nurse aides are needed.

훈련장소에 따른 혈중젖산농도, 심박수 및 혈압의 변화에 관한 연구

이창준,고영호 濟州大學敎 體育科學硏究所 1996 체육과학연구 Vol.2 No.-

The study was undertaken to investigate the influence of altitude training (1.300m) with middle-long athletes in sea-level, middle-altitude level, and high altitude level. The subjects recruited was composed of total 5 athlete, that's athletes(3). non-athlete majored physical education(2) and exercised t h e same weekly training program for 15 day in each training area. The contents analysedwas composed of blood lactate concentration & recovery ratio for anaerobocthreshold heart rate and systotic blood pressure. The conclusions obtained were as follows: 1. The blood lactate concentration showed not only significant differenceF(2.42)=22.15, P>0.0001 during recovery phase in altitude level and but alsoshowed significant difference in F(2.110)=4.58, P>0.012 during increasingdifference in altitude training area. 2. The heart rate showed significant difference in F(2.42)=6.47, P>0.003 during recovery phase but did show significant difference in F(2.110)=2.83, P>0.063 during increasing load phase in altitude training area. 3. The systolic blood pressure did not show significant difference in F(2.42)=22.15, P>0.9106 during recovery but did show significant difference in F(2.110)=3.15, P>0.0046 during increasing load phase.

직장 내 Probe 삽입이 내요도 괄약근 개방에 미치는 영향

고현윤,박병규,차영훈,박호준 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.6

韓國農村에 있어서의 蛔蟲感染相

李駿商,金光錄,高大警,成大林,李慈英,林漢鍾 한국농촌보건회 1980 농촌의학·지역보건 Vol.5 No.1

육상 · 수영 Sprinter의 점증적 부하기와 회복기에 혈중젖산농도 및 심박수 변화에 관한 연구

이창준,고영호 濟州大學敎 體育科學硏究所 1996 체육과학연구 Vol.2 No.-

The study was undertaken to analysis thee change of bloos lactate concentration and heart rate between inccreasing and recovery period after all-out condition with sprint of athletic(3) and swim.(3) teams F(2.18) =0.30. P)0.7477 in heart rate during increasing load phase. The conclusion obtained were as follows: 1. ANOVA result of diference blood lactate in athletic and swim team was F(2.18)=0.05. P>0.6141 F(2.18) =0.48. P>0.6253. and was F(2.18) =0.56. P>0.5790. F(2.18)=0.30, P>0.7477 in heart rate during increasing load phase. therefore difference beteen athletic and swim team did not show significaant. 1. ANOVA result of diference blood lactate in athletic and swim team was F(2.15) =6.60,P>0.0080. F(2,15) =3.04. P>0.0777 and was F(2.15)=0.12, P>0.0.8891, F(2.15)=0.75. P>0.4874 in heart rate during recovery phase. therefore difference in athletic team showed significant but and id'nt in sim team.