Self-powered flexible touch sensors based on PZT thin films using laser lift-off

Noh, M.S.,Kim, S.,Hwang, D.K.,Kang, C.Y. Elsevier Sequoia 2017 Sensors and actuators. A Physical Vol.261 No.-

<P>Touch screens have become an inherent part of the user interface in many electronics applications such as smartphones. The two types of developed touch sensors, the resistive and capacitive sensing devices, may face several difficulties when applied to flexible device applications such as touch signals arising from bending motions. In this study, we assess the feasibility of flexible touch sensors based on piezoelectric PbZr0.52Ti0.48O3 (PZT) thin films. Piezoelectric ceramic based flexible touch sensors possess unique advantages including scalable fabrication, fast response time, durability, and being self-powered. A demonstration device has been fabricated with a sandwich structure consisting of Pt electrode/functional PZT/Pt electrode/flexible substrate structure using laser lift-off (LLO) method. In order to anneal the functional PZT layer at high temperature (600 degrees C), the device was first fabricated on the sapphire substrate and transferred via melting sacrificial PZT layer with an excimer laser. We demonstrate the detection of x- and y-axis touch location via piezoelectric materials and confirm that the flexible piezoelectric touch sensors can distinguish between touch-induced and bending-induced signals via signal location, signal shape, and duration time. A notable feature of this fabrication technique involves its possibility to be fabricated in high resolution. This device may potentially achieve high resolution with suitable fabrication techniques, thus, providing the possibility for the next generation touch sensors. (C) 2017 Elsevier B.V. All rights reserved.</P>

여중생의 외모만족도와 정신건강의 관계

노희경,문소현,박세은,서재은,이수현,이현영,임영신,정유리,황유리 이화여자대학교 간호과학대학 2013 이화간호학회지 Vol.- No.47

Purpose: The purpose of this study was to identify the relationship between satisfaction toward appearance and the level of mental health among female middle school students. Methods: The total study sample was 432 consisting of 3rd year female students who attended co-educational or girls’ middle schools in Korea. Data were collected from August 8 to August 16, 2012. Statistical analyses were conducted using t-test and Pearson’s Correlation Coefficient with SPSS18.0Windows software. Results: There was correlation between appearance satisfaction and mental health, especially with personal sensitivity (r= -.447, p= .000) and depression (r= -.350, p= .000). The level of mental health significantly differed according to type of school (t= -2.668, p= .008). However, appearance satisfaction did not differ according to type of school. Conclusion: The results of this study implied the importance of appropriate education and nursing intervention which would improve satisfaction toward the appearance of female middle school students.

Atomic layer deposition of Y2O3 films using heteroleptic liquid (iPrCp)2Y(iPr-amd) precursor

Park, I. S.,ChanJung, Y.,Seong, S.,Ahn, J.,Kang, J.,Noh, W.,Lansalot-Matras, C. Royal Society of Chemistry 2014 Journal of materials chemistry. C, Materials for o Vol.2 No.43

간호 대학생의 간호정보역량과 문제해결능력 연구

권현지,김송이,김지홍,노유진,박수아,손엄지,엄민지,윤정혜,Man Ngaih Cing,김미영,김지연 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50

Purpose: The purpose of the study was to investigate the relationship between nursing students' nursing informatics competencies and problem solving skills. Methods: Data were collected from a convenient sample of 181 nursing students at 14 universities in Korea from September 20th, 2015 to February 25th, 2015. Data were analyzed by descriptive statistics, t-test, ANOVA and Pearson’s correlation coefficient. Results: The mean score for nursing informatics competencies and problem solving skills were respectively 3.57±0.74 and 3.35±0.65. Relationship of nursing informatics competencies to problem solving skills was statistically significant(r=.785, p<.01). Conclusion: The result of this study suggests that nursing informatics competencies is significantly related to problem solving skills of the nursing students. Therefore, nursing informatics education program for the nursing students would be a helpful intervention for problem solving skills of the nursing students. And further studies are required with more sample sizes and more systematic data collecting methods to confirm these results.

Lactobacillus reuteri의 Bacillus anthracis Sterne 34 F2 대한 항균효과

권남훈,김소현,배원기,김지연,임지연,노경민,김준만,안종삼,허진,박용호 한국수의공중보건학회 2001 예방수의학회지 Vol.25 No.4

Antimicrobial activities of three different Lactobacillus strains (Lactobacillus reuteri, L. bulgaricus, and L. casei) against Bacillus anthracis were determined on the Mueller Hinton Agar containing each culture supernatant obtained from 3 different growth conditions (MRS without glycerol, MRS with 0.5 M glycerol and 0.25 M glycerol solution).Though antimicrobial activity of L. reuteri in the first two conditions was not better than the others', the activity was significantly higher than those of others in 0.25 M glycerol solution. This prominent effect might be attributable to reuterin, produced by L. reuteri using glycerol. We could detect the presence of reuterin in the supernatant of 0.25 M glycerol solution with 500 MHz Nuclear Magnetic Resonance (NMR). The result of minimum bactericidal concentration (dilution fold) against spore of B. anthracis has revealed that reuterin had strong effect against anthrax spores. To examine any changes of antimicrobial activities of the probiotics, the probiotics were treated with different pH concentration, pepsin or trypsin digestion. The study has revealed that antimicrobial activities of L. bulgaricus and L. casei were significantly decreased, but reuterin activity was not entirely affected by any of these treatments.

설계제작된 원판틀형 RO 모듈의 분리성능에 관한 연구

노상호,김응석,배성렬 漢陽大學校 環境科學硏究所 2002 環境科學論文集 Vol.23 No.-

역삼투를 이용한 막분리 공정에서 공정상에 따르는 농도분극화 현상과 막오염현상(fouling)을 최소화하기 위해 원판틀형 모듈의 장애판(baffle)을 각기 달리 제작하여 역삼투 시스템에 대한 분리성능을 평가하였다. 공급수는 NaCl, sucrose, caprolactam 수용액을 사용하였고, 온도는 25C로 유지시켰다. 각 수용액의 농도는 1 wt%, 2 wt%, 3 wt%로 변화시켰으며, 압력은 10bar에서 35bar까지 2.5bar씩 증가시키면서 실험을 행하였다. 장애판의 배열이 서로 다른 두 모듈의 분리성능에 대한 실험 결과에 따르면 유체가 와류로 흐르려는 경향이 보다 큰 type #2의 모듈이 막표면에 용질이 축적되는 농도 분극화 현상을 감소시켜 type #1의 모듈보다 낮은 투과 유속을 보였고, 두 모듈에서의 제거율은 큰 차이가 없었다. 공급수의 농도를 증가시킴에 따라 막의 투과 유속과 제거율은 점차 감소하였으며, NaCl 수용액은 농도 분극화에 따른 삼투압의 영향을 크게 받았으나, sucrose 수용액의 경우는 크게 영향을 받지 않았다. 또한, 막과 모듈의 갯수를 적층시켜가며 실험한 결과, 각각의 모듈에서 유입농도가 순차적으로 증가하여 투과 유속은 점차 감소하였으며 막을 통해 투과된 생산수의 양은 누적되어 많은 양을 얻을 수 있었다. In order to minimize the problems of concentration polarization and fouling that may arise in the course of membrane separation by reverse osmosis (RO), two kinds of baffle arrangements in disc plate and frame RO modules were made and their separation performance was evaluated. The experiment was performed with solutions of NaCl, sucrose, and caprolactam at a constant temperature of 25C. Concentrations of each test solution were 1,2, and 3%(wt), and the pressure was changed from 10 to 35bar with an increment of 2.5bar. Results showed that the separation performance of type #2 module allowing turbulent flow was better than type #1 module, due to the decrease in concentration polarization at the membrane surface. As the concentration of feed solutions increased, the flux of NaCl solutions were influenced by osmotic pressure resulting from the concentration polarization, but the sucrose solutions were not. Also, results from the experiments with gradual increase of numbers of membranes and modules showed that the amount of products permeated through the membrane increased, whereas the permeation flux decreased as the feed solutions gradually concentrated at each module.

FLUENT를 이용한 날개끝 보오텍스 해석

노영학,이동연,현범수 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.1

FLUENT를 이용하여 사각 수중익 (Rectangular Hydrofoil)의 날개 끝에서 발생하여 전개되는 날개끝 보오텍스 (Tip Vortex)가 날개의 받음각과 위치에 따라 어떻게 전개되는지를 조사하였다. 해석된 결과를 검증하기 위하여 회류수조에서 입자영상유속계 (PIV)를 이용하여 구한 유속계측결과와 비교하고 그 물리적 타당성을 분석하였다. 또한 Vortex Core를 정의하는 방법을 제안하고 그 형상의 대칭성 여부, 받음각에 따른 크기의 변화여부를 면밀히 분석하고자 하였다.

보행형 인발식 마늘수확기 개발

노광모,장영창,박준걸,용상호 한국농업기계학회 2002 바이오시스템공학 Vol.27 No.6

Membrane Module내 Baffle에 의한 물질전달 현상에 관한 연구

노상호,김태석,배성렬 漢陽大學校 環境科學硏究所 2002 環境科學論文集 Vol.23 No.-

본 연구에서는 원판틀형 모듈(module)에서 비압축성 2차원 난류흐름을 고려하였다. 막 모듈(Membrane module)에 대한 2차원 공정모사를 하는데 중요한 변수로 사용된 것은 장애판(baffle)간의 간격과 장애판 높이를 포함한 채널(channel)의 형태와 유체의 유입속도이었다. 장애판 높이는 채널 높이의 1/2일때와 유체의 유입속도가 1.2m/s일 경우가 농도분극을 감소시키는데 가장 큰 효과를 나타내었다. 유체의 유입속도가 커질수록 막 표면의 용질농도는 감소하지만 채널 입구의 압력강하는 커지기 때문에, 에너지 절약 측면과 농도분극 방지측면을 고려한다면, 1.0m/s가 가장 적당하였다. 결과적으로 채널의 형태와 유체의 유입속도는 용질의 물질전달에 많은 영향을 미친다. The incompressible two-dimensional turbulent flow in a disk and plate type module was studied under the steady state. Important parameters in a two-dimensional process design of membrane module used were the channel configuration including the width between baffles and the height of baffle, and the flow rate of feed. The height of baffle was most effective in reducing CP at the membrane surface when the height was 1/2 of the height of channel and the flow rate of fluid was 1/2m/s. As the flow rate of feed fluid increases, the solute concentration at the membrane surface decreases but the pressure drop at the channel inlet increases. Considering the aspects of energy savings and CP reduction, the optimal flow rate was found 1.0m/s. Results showed that the channel configuration and the flow rate of feed fluid had a significant influence on the mass transfer of the solute.

대두의 광학적 선별장치 개발을 위한 선별 인자 구명

노상하,김현룡,황인근 한국농업기계학회 1998 바이오시스템공학 Vol.23 No.4