• Journal of the Semiconductor & Display Technology
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• v.15 no.4
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• pp.73-78
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• 2016

Contact pressure distribution between PVA brush and semiconductor wafer was measured by developing a test setup which could simulates the post CMP cleaning process. The test set-up used thin film type pressure sensor which could measure the pressure distribution of contact area with the resolution of $15.5ea/cm^2$. As the experimental results, it was verified that there had been severe contact pressure non-uniformity along the axis of the brush and between the adjacent projections on the brush's surface. These results should be considered when developing post CMP cleaning stage or designing the PVA brush.

• Polymer(Korea)
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• v.24 no.4
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• pp.488-498
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• 2000

Molecular bottle-brush was prepared by hydrogen-bonding between poly(4-vinylpyridine)(P4VP) as main chain and 3-pentadecylphenol (PDP) as amphiphilic side chain. Variation of long period ( $L_{p}$), order-disorder transition temperature ( $T_{ODT}$) and mesomorphic structure of bottle-brush were investigated by changing various mole ratio (x) of pyridine group in P4VP and PDP and molecular weight of P4VP. Upper critical solution temperature (UCST) behaviour was observed. For x 0.8-0.9, maximum critical temperature was found. As molecular weight of P4VP was increased, phase transition occurred at higher temperature. It was found that phase behaviour of the bottle-brush was affected by mobility of P4VP as well as size and regularity of lamellar structure. The $L_{p}$ determined from analysis of crystal structure was in the range of 35 $\AA$ and 40 $\AA$ and was more affected by the molecular weight of P4VP than by mole ratio (x). However, if the molecular weight of P4VP was high, LP value was little affected.ted.d.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2000.06a
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• pp.187-193
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• 2000

Friction characteristics and electrical resistance of sliding contacts in slipring-brush assembly were investigated. Four brush materials containing relative amounts of copper and graphite were studied. The result showed that a copper-graphite brush at a particular graphite content exhibited the most stable frictional and electrical behaviour suggesting an optimum amount of solid lubricant in metal-graphite brush system. Microscopic observation and the surface analysis showed good agreement with this phenomena.

• The Journal of the Korean dental association
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• v.55 no.2
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• pp.166-171
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• 2017

Periodontitis is the major concern of oral disease to human, and begins in the interdental area. The aim of this study is to discuss the clinical application method and the meaning of interdental brush. It is very difficult to change oral health behaviors, because patients believe that it is enough that the reason of tooth brushing is to remove food debris, not dental biofilm. Moreover, there are several barriers for using interdental brush. For the better oral health and maintenance of dental prosthesis, it is very important to motivate the use of the interdental brush well, and teach the desirable design of the interdental brush and the clinical meaning to patients.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.2
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• pp.36-43
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• 2004

In this paper, the frequency spectra from respective mechanical noise signals detected using ultrasonic wave and AE(Acoustic Emission) sensor were analysed to under spark generation between brush and commutator side with arbitrarily 15$^{\circ}$ rotation for brush from the DC motor in operation. Also, the frequency spectra from respective magnetizing noise signals detected using ultrasonic wave and AE sensor were analysed to under neutral point for brush from the DC motor in normal operation. And the analyses and comparison between the mechanical noise signal and magnetizing noise signal of ultrasonic wave with brush location change from the DC motor in operation. As the experimental results, tile mechanical noise signal of ultrasonic wave under spark generation between brush and commutator side with brush location change from the DC motor in operation were increased about 2.5∼3.0 times than magnetizing noise signal of ultrasonic wave form the DC motor in normal operation. Also, the main frequency band for mechanical noise signals of AE under spark generation between brush and commutator side with brush location change from the DC motor in operation, appeared about 1.3[MHz]∼l.5[MHz] by the fast fourier transform.

• Journal of Korean Biological Nursing Science
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• v.9 no.2
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• pp.118-124
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• 2007

Purpose: The purpose of this study was to compare three surgical scrub methods-4% chlorhexidine gluconate(CHG) with brush, 4% CHG without brush, and waterless scrub using 1% CHG and 61% ethanol combination(alcohol-based agent)-for antimicrobial efficacy. Method: "Glove-juice technique" was used to evaluate microbial hand counts before surgical scrubs, 1 min and 3 hr after surgical scrubs. Result: Waterless scrub using CHG and ethanol combination resulted in a 4.8-log reduction at 1 min and 4.0-log reduction at 3 hr. CHG without brush resulted in a 4.7-log reduction at 1 min and 3.3-log reduction at 3 hr. The traditional scrub using CHG with brush resulted in a 3.6-log reduction at 1 min and 0.8-log reduction at 3 hr. The waterless scrub and CHG without brush showed significantly higher log reduction(p<.05) than CHG with brush at 1 min and 3 hr after surgical scrub. Waterless scrub showed greater log reductions than CHG without brush, but there was no statistical difference between the two groups. Conclusion: Waterless scrub using alcohol-based agent showed more persistent and immediate antimicrobial efficacy than either CHG with brush or CHG without brush.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.17 no.3
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• pp.146-154
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• 2024

In this paper, we present a convenient liquid crystal (LC) molecular alignment method using brush hairs as an alternative to the rubbing process in the LC display industry. Titanium strontium yttrium zirconium oxide (TiSrYZrO) solution was prepared using a sol-gel process, and the TiSrYZrO alignment film production and LC molecular alignment were integrated through a one-step brush coating process. As the curing temperature increased, the LC molecule alignment of the LC cell improved, and the formation of a physical surface anisotropic structure due to the shear stress caused by the movement of the brush hairs on the coating surface led to uniform alignment of the LC molecules. Uniform and homogeneous LC molecular alignment was confirmed through polarizing optical microscopy and pretilt angle measurement. Through thermal oxidation using X-ray photoelectron spectroscopy, the TiSrYZrO thin film well formed of metal oxide was confirmed and verified to have excellent optical transparency. From these results, it is expected that a convenient LC molecular alignment method using brush hairs as an alternative to the rubbing process will be a viable next-generation technology.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.595-595
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• 2013

본 연구에서는 brush painting공법을 이용하여 인쇄형 유기태양전지에 적용이 가능한 ITO nanoparticle/Ag nanowire/ITO nanoparticle (Nano IAI) 다층 하이브리드 투명 전극의 전기적, 광학적, 구조적 특성을 연구하였다. 평균 25 nm 사이즈의 ITO 나노 입자로 구성된 ITO 나노 잉크와 직경 20~25 nm의 Ag nanowire 잉크를 기반으로 Brush painting 기술을 적용해 상온, 상압에서 낮은 면저항과 높은 투과도를 가지는 Nano IAI 하이브리드 투명 전극을 제작하였다. Nano IAI 투명 전극 제작 시 일정한 두께에서 Ag nanowire 코팅을 위한 brush painting 횟수를 변수로 하여 최적화 공정을 진행하였으며, Ag nanowire가 2번 brush painting 된 Nano IAI 다층 하이브리드 투명전극은 $3.4{\times}10^{-3}$ ohm-cm의 비저항과 52.33 ohm/square의 낮은 면저항을 나타내었다. 이를 통해 효과적으로Ag nanowire를 ITO nanoparticle 사이에 삽입할 경우, 고온의 열처리 공정을 통하지 않고 낮은 면저항을 가지는 인쇄형 투명 전극을 구현할 수 있음을 확인할 수 있었다. 특히 Nano IAI 다층 하이브리드 전극은 83.83%의 높은 투과도를 나타내는데 이는 삽입된 Ag Nanowire의 폭과 길이가 나노 사이즈이기 때문에 입사되는 빛이 흡수되기보다 대부분 투과하기 때문으로 사료된다. 또한, XRD 분석과 HRTEM 분석을 통해 Nano IAI 다층 하이브리드 투명전극의 전도 메커니즘을 설명하였다. 이와 같은 우수한 전기적, 광학적 특성은 brush painting 기법으로 제작된 Nano IAI 다층 하이브리드 투명 전극의 인쇄형 유기태양전지 적용 가능성을 나타낸다.

• Journal of Korean society of Dental Hygiene
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• v.10 no.3
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• pp.441-448
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• 2010

Objectives : This study was conducted in order to investigate the percentage of adolescents who brush their teeth after lunch and its related factors using raw data from the Fourth Korea National Health and Nutrition Examination Survey. Methods : In order to extract adolescents to be subjected to this study, 300 adolescents between the age of 12 to 18 who are currently attending junior and senior high school were chosen out of a total of 4,594 subjects. The results from the health surveys and the oral checkup results from the medical examination conducted on these adolescents were analyzed. Results : 1. The percentage of adolescents who brush their teeth after lunch was 33.9%. 2. The percentage of the adolescents who brush their teeth after lunch differed significantly according to the gender (p<0.001), age (p<0.05), the time of their recent visit to the dentist (p<0.05), and whether they had suffered from permanent tooth caries (p<0.05). 3. The factors which affect whether the adolescents brush their teeth after lunch was their gender, the total number of the times they brush their teeth per day, and their age. Conclusions : Effective oral health education methods should be reinforced in order to increase the percentage of the adolescents who brush their teeth after lunch.

• Journal of The Korean Society of Grassland and Forage Science
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• v.16 no.3
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• pp.235-244
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• 1996

This experiment was carried out to evaluate the effect of pasture type on behavior pattern, change of body type and daily gain of Korean native goat at the College of Natural Science of Kon-KuK University in Chungju. The results are summarized as follows : Relative coverage of native herbage at the pasture area was 62% in initial grazing period and that final grazing period decreased by 36%. while pasture plants increased from 17 to 42%. In brush area, Quercus serrata. Quercus dentutu, Prunus surgenrii and Rhus vemicrflua of high palatability decreased with increase in grazing period. but Rhododendron mucronulatum and Rhodendrorl schlippenbachii of low palatability tended to increase. Average crude protein content at the pasture area(12.3Q) during grazing period was higher than that at the brush area(10.2). However, ADF and NDF content was lower than brush area. Ca, Mg and Na of mineral content showed highly at the brush area during the grazing period. but Na showed highly at the pasture area. Eating time Korean native goat was not different between pasture area(369 min.) and brush area(361 min.), but ruminating time showed highly at the pasture area(441 min.). Average ratio of GTlRT at the pasture and brush area was not different m 0.88 and 0.87, respectively. All body type(withers height, body length, shin circum, hip height, hip width and chest girth) showed highly that pasture area compared to brush area during the grazing periods. The daily liveweight gain showed 60.6 and 48.98 at the pasture and brush area, respectively.