• Title/Summary/Keyword: Barrier Test

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Optical Properties of $TiO_2/M/Ag/M/TiO_2$ Films with Different Diffusion Barrier Layers (확산방지막에 따른 $TiO_2/M/Ag/M/TiO_2$ 투명 열절연 박막의 광학적 성질)

  • 이경준;이진구;박주동;김진현;김영환;오태성
    • Journal of the Korean Vacuum Society
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    • v.5 no.2
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    • pp.147-155
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    • 1996
  • Optical properties of $TiO_2/M/Ag/M/TiO_2$ films have been changed with the diffusion barrier metal M. Optimum opticla properties of $TiO_2/M/Ag/M/TiO_2$ as the transparent heat mirror film, could be obtained with Ti among diffusion barrier metals of Ti, Cu, Zr and Al. $TiO_2/M/Ag/M/TiO_2$ film, which was fabricated by sputtering of 18 nm-thick $TiO_2$ and Ag, and 4nm-thick Ti, showed maximum transimittance of 89% at visible wavelength and infrared reflectance of 97% at wavelength of 3000 nm. Optical properties of this film was not degraded by Xenon-sunshine weather test for 240 hours. For specimens with barrier layers of Cu, Zr, and Al, degradation of optical properties by weather test was increased in a sequence of films with Cu, Zr, and Al barrier layers.

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Reduced Scale Model Test for Reinforcement of Noise Barrier with Wood (축척모형실험에 의한 방음벽 보강용 수림 효과 연구)

  • 정성수;김용태;조승일;신수현
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.1193-1196
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    • 2003
  • Noise reduction effect of a pine tree which was used to reinforce a noise barrier was studied by using reduced scale model test. The result show that the pine tree itself was less effective but the combination of pine tree and noise barrier was good for reducing the noise and sight.

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Compatibility for Proposed R.94 PDB Test (PDB 시험에 대한 충돌 상호 안전성)

  • Jang, Eun-Ji;Kim, Joseph;Beom, Hyen-Kyun;Kwon, Sung-Eun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.3
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    • pp.149-155
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    • 2010
  • Currently various safety tests are being performed in many countries with growing interest in vehicle safety. However the vehicles which have good safety performance in these tests could not secure the good performance in real car to car accident. So new test protocol using progressive deformable barrier (PDB) was proposed by EEVC in Europe, NHTSA in USA and some vehicle manufacturers, etc. The target of PDB test is to control partner protection in addition to self-protection on the same test. The proposal is to update current ECE R.94 frontal ODB test. So barrier, impact speed, overlap are changed to avoid bottoming-out in the test configuration. In this paper 3 different tests (R.94, EuroNCAP and PDB test) were carried out using current production vehicles with same structure. The results of these tests were compared to understand PDB test. As a result PDB test shows the highest vehicle deceleration and dummy injury because PDB offers a progressive increase in stiffness in depth and height. However vehicle intrusion was affected with rather test velocity than stiffness of deformable barrier. PDB deformation data is used for partner protection assessment using PDB software and it shows that the test vehicle is rather not aggressive.

A Study on Vehicle Crash Characteristics with RCAR Crash Test in Compliance with the New Test Condition (동일 승용차량에 대한 RCAR 신.구 충돌시험을 통한 차체 충돌특성에 관한 연구)

  • Lim, Jong-Hun;Park, In-Song;Heo, Seung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.190-194
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    • 2006
  • This research investigates vehicle structure acceleration and vehicle deformation with RCAR crash test. To investigate vehicle damage characteristics in an individual case, it is possible to RCAR low speed crash test. In this study, two tests were conducted to evaluate difference between RCAR new condition and RCAR old condition. A two large vehicles were subjected to a frontal crash test at a speed of 15km/h with an offset of 40% $10^{\circ}$ angle barrier and flat barrier. The results of the 15km/h with an offset of 40% $10^{\circ}$ angle barrier revealed high acceleration value on the vehicle structure and high repair cost compared to the RCAR 15km/h with an offset of 40% flat barrier. So in order to improve damage characteristics in low speed crash of vehicle structure and body component of the monocoque type passenger vehicles, the end of front side member and front back beam should be designed with optimum level and to supply the end of front side member as a partial condition approx 300mm.

A Study on Acoustic Emission Characteristics through the Cyclic Thermal Test of Thermal Barrier Coating by Plasma Spray Process (플라즈마 용사법에 의한 열차폐 코팅의 열피로에 따른 AE신호 특성 연구)

  • Park J.H.;Lee K.H.;Ye K.H.;Kim S.T.;Jeon C.H.;Kim J.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1349-1352
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    • 2005
  • This paper is to investigate a defect for thermal barrier coating layers by acoustic emission method in 4-point bending test. The two-layer thermal barrier coating is composed of $150\mu{m}\;CoNiCrAlY\;bond\;coating\;by\;vacuum\;plasma\;spray(VPS)\;process\;and\;250\mu{m}\;ZrO_2-8wt%Y_2O_3$ ceramic coating layer by air plasma spray(APS) process on Inconel-718. The specimen prepared by cyclic thermal test(500, 1000, 2000cycle) at $1050^{\circ}C$ The AE monitoring system is composed of PICO type sensor, a wide band pre-amplifier(40dB), PC and AE DSP(16/32 PAC) board. The AE event, amplitude, Cumulative energy and count of coating specimens is evaluated according to cyclic thermal test.

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The Effect of Consumer’s Switching Barrier Perception on Store Loyalty in Apparel Product Purchasing (의류제품 구매시 소비자의 전환장벽지각이 점포충성도에 미치는 영향)

  • 김수진;정명선
    • Journal of the Korean Society of Clothing and Textiles
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    • v.25 no.8
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    • pp.1512-1523
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    • 2001
  • The purposes of this study were to examine the effect of switching barrier perception on store loyalty in apparel product purchasing to classify the factors of switching barrier perception, and additionally ot identify differences of store loyalty and switching barrier perception according to demographic characteristics. The questionnaire was administered to 300 women shopped in a department store in Gwang-ju city during February 10-23, 2001. Data collected from 261 women were analyzed by using frequency, factor analysis, ANOVA, Duncan-test, regression analysis by SPSS for windows PC program. The results were as follows; 1. The consumer’s perceived switching barrier was composed of three factors; economic psychological, time factor. 2. There was significant difference in store loyalty according to consumer’s age, occupation, education level. and income. 3. There was significant differences in economic. time switching barrier perception according to consumers’age, occupation education level, and income. There was significant difference in psychological switching barrier perception according to consumers’ occupation education level, and income. 4. The swiching barrier perception significantly infulenced on the store loyalty.

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Clinical comparison of resorbable and nonresorbable Barrier in guided tissue regeneration of human intrabony defects (흡수성 차폐막을 이용한 조직유도재생술의 임상적 효과)

  • Hur, Yin-Shik;Kwon, Young-Hyuk;Lee, Man-Sup;Park, Joon-Bong;Herr, Yeek
    • Journal of Periodontal and Implant Science
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    • v.29 no.1
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    • pp.193-207
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    • 1999
  • The purpose of this study was to compare the clinical results of guided tissue regeneration(GTR) using a resorbable barrier manufactured from an copolymer of polylactic acid (PLA) and polylaetic-glycolic acid(PLGA) with those of nonresorbable ePTFE barrier. Thirty two patients(25 to 59 years old) with one radiographically evident intrabony lesion of probing depth ${\geq}$6mm participated in a 6-month controlled clinical trial. The subjects were randomly divided into three independent groups. The first group(n=8) received a ePTFE barrier. The second group (n=12) received a resorbable PLA/PLGA barrier. The third group (n=12) received a resorbable PLA/PLGA barrier combined with an alloplastic bone graft. Plaque index (PI), gingival index(GI), probing depth(PD), gingival recession, clinical attachment level(CAL), and tooth mobility were recorded prior to surgery and at 3, 6 months postsurgery, Statistical tests used to analyze these data included independent t-test, paired t-test, one-way ANOVA. The results were as follows : 1. Probing depth was significantly reduced in all groups at 3, 6 months postsurgery and there were not significant differences between groups. 2. Clinical attachment level was significantly increased in all groups at 3, 6 months postsurgery and there were not significant differences between groups. 3. There were not significant differences in probing depth, clinical attachment level, gingival recession, tooth mobility between second group (PLA/PLGA barrier) and third group (PLA/PLGA barrier combined with alloplastic bone graft) 4. Tooth mobility was not significantly increased in all groups at 3, 6 months postsurgery and there were not significant differences between groups. In conclusion, PLA/PLGA resorbable barrier has similar clinical potential to eP'IFE barrier in GTR procedure of intrabony pockets under the present protocol.

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Application of Horizontal Barrier on a Rack to Reduce Fire Spread (화재확산 저감을 위한 랙크 내 수평차단막 적용에 관한 연구)

  • Yeo, In-Hwan;Cho, Gyu-Hwan
    • Fire Science and Engineering
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    • v.31 no.4
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    • pp.71-79
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    • 2017
  • A rack warehouse with a vertically loading type and high loading density has severe risks and damage during its fire. In this regard, US and Japan strive to minimize the fire spread by applying in-rack sprinkler, horizontal barriers, etc. corresponding to their own rack warehouse but there is no study and policy in Korea. Therefore, a model scale fire test was carried out targeting the standard rack incorporating the national rack warehouse in order to check fire characteristics in ignition points and installation distances of horizontal barriers in this study. As a result of the test, vertical fire spread of about 30% was inhibited by narrowing its installation distance from 2-layer to 1-layer in an ignition condition of the flue space. In addition, as a result of the measurement of the temperature in the upper and lower parts of the horizontal barrier, the temperature distribution showed about 2~4 higher in a condition with an installation of the barrier than that in the condition without the barrier. Consequently, it is likely that the horizontal barrier will help the initial operation of in-rack sprinkler.

A Basic Study for the Noise Barrier Standard of Railway (철도방음벽 표준규격을 위한 기초 연구)

  • 조준호;이덕희;정우성;이규진
    • Proceedings of the KSR Conference
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    • 2002.05a
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    • pp.584-589
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    • 2002
  • Recently, in various industrial field standardization and performance improvement are actively on going. Noise barrier is generally used to reduce railway noise. But the effectiveness of its use is low because of low level of technology development. In this basic study, test item and its specification are suggested for standardization of railway noise barrier.

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