• 한국정밀공학회지
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• 제34권3호
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• pp.167-172
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• 2017

This study proposes a method for identifying correlations between tension and drop height for sessile droplets in a roll-to-roll processing system. The effect of tension and drop height on the contact angle of a sessile droplet is presented. Design of experiment (DOE) methodology and statistical analysis are used to define a correlation between the process parameters. The contact angle is decreased while increasing tension and drop height. The influence of the tension is less significant on the contact angle compared with the effect of the drop height. However, tension should be considered as a major parameter because it is not easy to fix with roll eccentricity and compensating speed of the driven roll. The results of this study show that the effect of tension on the contact angle of a sessile droplet is more important than drop height because the drop height is fixed when the process systems are determined.

• 설비공학논문집
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• 제12권1호
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• pp.95-101
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• 2000

The effect of surface contact angle on the behavior of frost formation in a fin-tube heat exchanger is investigated experimentally. It is shown that both heat exchangers with hydrophilic and hydrophobic surfaces appear to have a better thermal performance than bare aluminium heat exchanger, but the improvements are very small. There is a little increase in the amount of the frost deposited onto the heat exchanger with both hydrophilic and hydrophobic surface. However, the effect of contact angle on the frost density is observed ; the frost with high density forms on the heat exchanger with hydrophilic surface ; and the frost with low density is deposited onto the heat exchanger with hydrophobic surface when compared with the frost deposited onto the heat exchanger with bare aluminium surface. This may be attributed to the fact that the shape of water droplets which condense on the surface of heat exchanger at the early stage of frosting varies with contact angle, and thus makes a difference on the structure of frost formation. From the experiments with different relative humidity of inlet air, it is shown that the variations of operating parameter make no influence on the effect of surface contact angle on the frosting behavior in the heat exchanger.

• 대한의용생체공학회:의공학회지
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• 제39권2호
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• pp.103-108
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• 2018

This study reviews the common-mode noise model of indirect-contact ECG measurement which uses capacitive electrode and capacitive ground, and shows the reason of the large common-mode noise in indirect-contact ECG. And then, this study shows driven-right-leg ground in indirect-contact ECG measurement, and reviews how the driven-right-leg ground reduces the common-mode noise. This study then analyzes the relation between the effective area of the indirect-contact ground and the gain of the driven-right-leg circuit. This study introduces the output voltage saturation of the driven-right-leg circuit, which occurs frequently in indirect-contact ECG measurement with the condition of the high ground impedance. This study then shows the effect of the driven-right-leg circuit saturation on the common-mode noise.

• 한국의류학회지
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• 제15권4호
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• pp.437-445
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• 1991

The effect of diameter of rods or fibers on contact angle was studied in a vertical rod configuration. A contact angle measuring device described in the previous paper was optimized for the measurement of small-diameter fibers. It was shown that contact angles of water and hexadecane on nylon 6 monofilsments and glass rods increased with decrease of diameter below a critical diameter, which varied from one system to another. Beyond the critical value, contact angle of the liquid on the vertical glass rod reached to an equilibrium value which is equal to the unique value of the contact angle of the liquid drop on the horizontal glass plate.

• 한국엔터테인먼트산업학회논문지
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• 제13권8호
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• pp.345-356
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• 2019

본 연구는 미디어스포츠를 통하여 직접적인 스포츠 참여를 유도하기 위하여 미디어스포츠 접촉동기가 직접적인 스포츠 참가에 어떠한 영향이 있는지를 연구하고, 이러한 관계에서 소비자의 운동몰입과 운동지속이 어떠한 효과가 있는지를 연구함으로써 미디어스포츠와 스포츠 참가의 기초자료를 제공하고자 하였다. 2019년 4월 1일부터 4월 31일 까지 G광역시와 J도에 거주하며 스포츠에 참가한 경험이 있고, 미디어스포츠를 접촉한 경험이 있는 성인 남·여를 대상으로 모집단을 선정하여 300명을 대상으로 설문조사를 실시하였다. 스포츠 접촉동기, 운동몰입, 운동지속, 스포츠참가에 대한 관계를 규명하기 위하여 IBM사의 SPSS Ver. 21.0과 AMOS Ver. 21.0의 통계 프로그램을 이용하여 분석하였고, 연구의 결과는 다음과 같다. 첫째, 접촉동기, 운동몰입, 운동지속, 스포츠참가에 대한 직접적은 효과를 살펴보면, 미디어스포츠 접촉동기는 운동몰입에 직접적인 영향이 있는 것으로 나타났고, 운동지속에도 직접적인 영향이 있는 것으로 나타났으며, 스포츠참가에도 직접적인 영향이 있는 것으로 나타났다. 또한, 운동몰입은 운동지속에 직접적인 영향이 있는 것으로 나타났고, 운동지속은 스포츠참가에 직접적인 영향이 있는 것으로 타났다. 둘째, 접촉동기, 운동몰입, 운동지속, 스포츠참가에 대한 매개효과를 살펴보면, 미디어스포츠 접촉동기와 스포츠참가의 관계에서 운동지속은 매개효과가 있는 것으로 나타났다. 또한 미디어스포츠 접촉동기와 운동지속의 관계에서 운동몰입은 매개효과가 있는 것으로 나타났고, 운동몰입과 스포츠참가의 관계에서 운동지속은 매개효과가 있는 것으로 나타났다. 셋째, 미디어스포츠 접촉동기는 스포츠참가에 직접적인 영향이 없는 것으로 나타났다. 또한, 미디어스포츠 접촉동기와 스포츠참가의 관계에서 운동몰입은 매개효과가 없는 것으로 나타났다. 하지만, 미디어스포츠 접촉동기와 스포츠참가의 관계에서 운동몰입과 운동지속은 이중매개효과가 있는 것으로 나타났다.

• 대한전자공학회논문지
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• 제24권6호
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• pp.969-974
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• 1987

High value sheet resistance (Rs, 350 \ulcorner/ -80 K \ulcorner/ ) borom implanted polysilicon resistors were fabricated under process condition compatible with bipolar integrated circuits fabrication. This paper includes the effect of contact ion implantation on Rs and the effect of electron gun(e-gun) deosition vs. non e-gun evaporated metal contacts on the Rs. From results, we observed that the contact ion implanted samples showed higher Rs value than those without contact ion implantation. Also, it was shown that there is noticeable amount of Rs degradation for e-gun samples, while sputtered samples expressed little Rs degradation after PtSi was formed.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.168-168
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• 2012

본 연구에서는 Molybdenum oxide (MoOx)-doped 4,4',4"-tris[2-naphthyl(amino)] triphenylamine(2-TNATA)의 P-doping에 의한 hole ohmic contact과 fullerene (C60)/lithium (LiF)의 electron ohmic contact에 의한 All Ohmic contact를 이용한 유기 발광 다이오드 (OLEDs)의 광저항 특성의 향상을 설명한다. 이 소자의 성능은 MoOx-doped 2-TNATA의 두께와 도핑농도에 큰 영향을 받는다. glass/ITO/MoOx-doped 2-TNATA (100 nm)/Al 구조의 소자에서 MoOx-doped 2-TNATA 도핑 농도가 25%에서 75%로 증가할수록 hole only device의 hole ohmic 특성이 향상됐다. 그 이유는 p-type doping effect 때문이다. 또한 photoemission spectra 분석결과, p-type doping effect는 hole-injecting barrier 높이는 낮추고, hole conductivity는 향상되었다. 이것은 2-TNATA에 도핑된 MoOx의 전하전송 콤플렉스의 형성으로 hole carrier의 수가 증가하여 발생되었다. MoOx-doped 2-TNATA의 hole ohmic contact과 fullerene (C60)/lithium fluoride (LiF)의 electron ohmic contact 으로 구성된 glass/ITO/MoOx-doped 2-TNATA (75%, 60 nm)/NPB (10 nm)/Alq3 (35 nm)/C60 (5 nm)/LiF (1 nm)/Al (150 nm)의 소자구조는 6,4V에서 127,600 cd/m2 최대 휘도와 약 1,000 cd/m2에서 4.7 lm/W의 높은 전력 효율을 보여준다.

• Asian Journal for Public Opinion Research
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• 제10권4호
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• pp.293-315
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• 2022

Health care has become a rapidly growing industry where the role of nurses as a group of emotional labor employees is central and prone to burnout. The purpose of this study was to examine the role of supervision in moderating burnout caused by the effect of work intensity, customer contact, and self-efficacy, where the moderating role of supervision on burnout with its various predictors is still unstable. This quantitative study was based on research samples collected through questionnaires from 131 hospital nurses spread over two different locations. The questionnaire asked about supervision, work intensity, customer contact, self-efficacy and burnout used a Likert scale, which was then analyzed using SEM-PLS. The results indicated that work intensity and self-efficacy had a significant effect on burnout, while customer contact had no significant effect on burnout. Supervision as a moderator only significantly moderates the effect of work intensity on burnout, while supervision is not significant as a moderating variable on the effect of customer contact and self-efficacy on burnout. This study can contribute to the development of theories about burnout and practically can be used as a reference by policy makers in enhancing the role of supervision for nurses in hospitals.

• Tribology and Lubricants
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• 제12권4호
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• pp.52-59
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• 1996

The results of the electrical contact conductivity of multi-contact spots accounting the surface roughness and the non-conductive films of different origins such as air, water, cutting oil, and machining oil are presented. The array of metal spheres compressed between two flat plates has been used for simulation of the contact behavior of multiple contact of solids, under normal loading. Measurement of electrical contact resistance has been made using the equipment providing the adequate accuracy in the range of micro Ohms. The data on electrical contact resistance have been compared with theoretical predictions using the multiple contact model of constriction resistance. The effect of single spot number and array on conductivity of contact has been evaluated. The results of the experiments show that the contact resistance are closely related to the number of loading cycles, form of surface roughness, and presence of non-conductive films that reduce the size of the real electrical contact spots.

• Tribology and Lubricants
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• 제35권1호
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• pp.16-23
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• 2019

In this study, we aim to analyze the effects of both contact layer properties and surface roughness on contact resistance. The contact has a great influence on performance in terms of electrical conduction and heat transfer. The two biggest factors determining contact resistance are the presence of surface roughness and the surface layer. For this reason we calculated the contact resistance by considering both factors simultaneously. The model of this study to calculate contact resistance is as follows. First, the three representative surface parameters for the GW model are obtained by Nayak's random process. Then, the apparent contact area, real contact area, and contact number of asperities are calculated using the GW model with the surface parameters. The contact resistance of a single surface layer is calculated using Mikic's constriction equation. The total contact resistance is approximated by the parallel connection between the same asperity contact resistances. The results of this study are as follows. The appropriate thickness with reduction effect for contact resistance is determined according to the difference in conductivity between the base layer and surface layer. It was confirmed that the standard deviation of surface roughness has the greatest influence on surface roughness parameters. The results of this study will be useful for selecting the surface material and surface roughness when the design considering the contact resistance is needed.