• Transactions of the Korean hydrogen and new energy society
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• v.25 no.2
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• pp.145-150
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• 2014

This study investigates the preparation of anti-reflective (AR) coating film to improve the efficiency of solar cell. The AR coating film was successfully obtained by dip-coating with AR coatings prepared by sol-gel method. Fluoroalkylsilane was additionally introduced into the coatings to give the self-cleaning effect of AR coating film. We performed the abrasion test, pencil scratch hardness test and cross-cut test to identify the mechanical strength of AR coating film. As the results, the transmittance of AR coating films with 9.07, 18.13 and 27.20 of IPA/MTMS molar ratios were 93.1, 93.6 and 95.3%, respectively. The water contact angle and transmittance of AR coating film increased by the introduction of hydrophobicity. The prepared AR coating film shows the high level of abrasion, hardness and adhesion. The IPA/MTMS molar ratio of 27.20 and the withdrawing speed range of 0.20 ~ 0.28cm/sec are the optimal coating condition in terms of the transmittance and mechanical strength of AR coating film.

• Water for future
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• v.23 no.1
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• pp.99-107
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• 1990

The statistical analysis based on the past hydrologic data required to set up the water resources development plan and design the hydraulic structres rationally. Because hydrologic events have random factors implied, the sotchastic analysis is necessary. In this paper, same order of stochastic models of monthly runoff data(multivariate AR(1) and AR(2) models, univariate AR(1) and AR(2) models) are applied to compare the statistical characteristics. The other purpose of this paper is to compare the monthly series, which is generated by univariate and multivariate models. By comparing and estimating of each simulated series, it is known that the multivariate models, including the time and spatial colinearity, are better in prediction than univariate models in the analysis of monthly flow at south Han river basin.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.05a
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• pp.281-284
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• 2004

Mean energy of electrons in $SF_6-Ar$ Mixtures Gas used by MCS-BEq algorithm has been analysed over the E/N range $30{\sim}300[Td]$ by a two term Boltzmann equation and by a Monte Carlo Simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2[%] and 0.5[%] $SF_6-Ar$, 0.1[%] and 5.0[%], $SF_6-Ar$ mixtures were measured by time-of-flight(TOF) method. The transport Coefficients for electrons in (100[%])$SF_6$. (100[%])Ar, (0.2[%])$SF_6-Ar$ and (0.5[%]) $SF_6-Ar$, (5.0[%]) $SF_6-Ar$, (0.1[%])$SF_6-Ar$ mixtures were measured by time-of-flight method, and the electron energy distribution function and the parameters of the velocity and the diffusion were determined by the variation of the collision cross-sections with energy. The results obtained from Boltzmann equation method and Monte Carlo simulation have been compared with present and previously obtained data and respective set of electron collision cross sections of the molecules.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.15 no.5
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• pp.388-392
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• 2002

In this work, the etching of $CeO_2$ thin films has been performed in an inductively coupled $Ar/CF_4/Cl_2$ plasma. The highest etch rate of the $CeO_2$ thin film ws 250 ${\AA}/min$ and the selectivity of CeO$_2$to SBT was 0.4 at a 10% additive $Cl_2$ into Ar/($Ar+CF_4$)gas mixing ratio of 0.8. From result of X-ray photoelectron spectroscopy (XPS) analysis, there are Ce-Cl and Ce-F bonding by chemical reaction between Cl, F and Ce. During the etching of $CeO_2$ thin films in $Ar/CF_4/Cl_2$ plama, Ce-Cl and Ce-F bond is formed, and these prodcuts can be removed by the physical bombardment of Ar ions. The 10% additive $Cl_2$ into the Ar/($Ar+CF_4$)gas mixing ratio of 0.8 could enhance the reaction between Cl, F and Ce.

• Journal of the Semiconductor & Display Technology
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• v.8 no.2
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• pp.11-14
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• 2009

The $Sr_{0.7}Bi_{2.3}Nb_2O_9$(SBN) thin films are deposited on Pt-coated electrode(Pt/Ti/$SiO_2$/Si) using RF sputtering method at various $Ar/O_2$ ratio. We investigated the effect of deposition condition(specially $Ar/O_2$ ratio) on the structural properties of SBN thin film. As $Ar/O_2$ ratio was increased, the peaks in the XRD pattern became more sharp. Also, the peaks(008)(115)(220) in 80/20 of $Ar/O_2$ ratio were suddenly appeared. The optimum of the rougness showed about 4.33 nm in 70/30 of $Ar/O_2$ ratio. The crystallinity of SBN thin films were increased with the increase of $Ar/O_2$ ratio. Also, Deposition rate of SBN thin films was about 4.17 nm/min in 70/30 of $Ar/O_2$ ratio. The capacitance of SBN thin films were increased with the increase of $Ar/O_2$ ratio.

• Journal of the Korean Magnetics Society
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• v.4 no.1
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• pp.32-38
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• 1994

We have investigated the effects of sputtering Ar gas pressure on magnetic and magneto-optical properties in compositionally modulated Co/Pt superlattice thin films. The samples were prepared by dc magnetron sputtering. Sputtrering Ar gas pressure was varied from 2 to 30 mTorr. The microstructure of the samples was examined by scanning electron microscope and the x-ray diffractometry. The magnetization, the Kerr rotation angle, and the reflectivity of the samples were measured. The columnar structure was developed, and the coercivity was drasti- cally increased, when the sputtering Ar gas pressure was higher than 20 mTorr. We explained that the variation of the magnetization, the Kerr rotation angle, and the reflectivity was related with the microstructure influenced by the variation of the Ar gas pressure.

• The Journal of Korean Physical Therapy
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• v.31 no.3
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• pp.141-146
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• 2019

Purpose: To investigate the effect of an augmented reality (AR) system on muscle strength and function level of the paretic lower limb and the balance ability in the early rehabilitation program of acute stroke patients. Methods: The participants (30 or fewer days after stroke) were randomly assigned to receive intervention with an early rehabilitation program using an AR system (n=1) or an early rehabilitation program consisting of functional electrical stimulation and tilt table use (n=1). Patients in both subjects received interventions 4-5 times a week for 3 weeks. Results: In the paretic limb muscle strength, AR subject was increased from 15 to 39.6 Nm and Control subject was increased from 5 to 30.2 Nm. The paretic limb function of AR subject motor function was increased from 8 to 28 score and Control subject motor function was increased from 6 to 14 score. But sensory function was very little difference between the two subjects (AR subject: from 4 to 10 score, Control subject: from 3 to 10 score). In the balance ability, AR subject had more difference after intervention than control subject (AR subject: 33 score, Control subject: 22 score). Conclusion: The early rehabilitation program using the AR system showed a slightly higher improvement in the motor function of the paretic lower limb and balance ability measurement than the general early rehabilitation program. The AR system, which can provide more active, task-oriented, and motivational environment, may provide a meaningful environment for the initial rehabilitation process after stroke.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.379-386
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• 2021

The tourism industry and AR act as important factors to diversify the tourism industry by combining them with one another. Currently, the advent of mobile smartphones and AR interactive is expected to play a major role in improving tourists' experiences and promoting tourism. AR's high entertainment characteristics, realism and strong interaction can be actively used as a major advantage in promoting tourism. This paper presents some appropriate examples of how AR interactive design is used in tourism marketing through various use cases where AR interactive design is used in tourism. Furthermore, a detailed analysis of the Magical Gulangyu verifies the descriptions listed in the text and presents the direction of future research.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.7-8
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• 2017

증강현실(AR)의 기술력은 우리들의 생활속에 깊숙이 침투하여 혁신적인 변화를 가져오고 있다. 증강현실(AR)의 기술동향을 살펴보고, E-교과서 분야에 증강현실(AR)이 적용됐을 때 교육적 효과가 극대화 될 것으로 기대를 모으게 된다. 이에 증강현실(AR) 기술동향과 E-교과서 사례를 분석하여 증강현실(AR) 디자인 기술을 적용한 E-교과서 콘텐츠 기획에 관해 연구하고자 한다.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2001.07a
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• pp.110-113
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• 2001

ECR(electron cyclotron resonance) 플라즈마 식각 장비를 이용하여 SF$_{6}$/Ar과 Cl$_2$/Ar 플라즈마 가스에 대한 Platinum (이하 Pt) 박막의 식각 특성을 연구하였다. Pt 박막의 경우 Cl$_2$ 가스 혼합물에 대한 식각 특성은 많이 보고가 되어 왔으나 상대적으로 Fluorine 계열의 가스 혼합물에 의한 시각 연구는 미비하였다. 본 연구에서는 SF$_{6}$/Ar과 Cl$_2$/Ar 플라즈마 가스를 이용한 Pt 박막의 식각 특성을 비교 분석하고 각각의 가스와 Pt 박막과의 반응을 분석, 식각 특성을 개선하고자 하였다.