• 원예과학기술지
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• 제31권1호
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• pp.117-122
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• 2013

본 실험은 경실 종자인 잇꽃의 종자구조와 발아특성을 밝히고자 수행하였다. 잇꽃 종자의 외형적 특징은 단단한 종피 표면에 제(hilum)와 주공(micropyle)이 있으며, 제는 종자의 발달과정에서 태좌와 연결되어 있었고, 주공은 암술대와 연결되어 있었던 부분이다. 종자 침종 후 2-3시간 후에 제의 표면이 열렸으며, 발아 시 유아(embryo)가 제를 뚫고 돌출되었다. 잇꽃 종자의 흡습 전에 제와 주공에 파라핀을 처리하여 밀봉한 결과, 제 부위를 밀봉한 처리에서 종자의 발아가 이루어지지 않아 잇꽃 종자의 수분과 산소 교환이 제를 통하여 이루어진다는 것을 확인하였다. 잇꽃 종자의 제가 물에 잠기도록 수분을 공급한 발아실험(top of paper method)에서는 $15^{\circ}C$에서 31.3%, $20^{\circ}C$에서 15.7%, 그리고 $25^{\circ}C$에서 6.0%가 발아하였으며, between-paper method에 의한 실험에서는 $15^{\circ}C$에서 45.5%, $20^{\circ}C$에서 30.0%, $25^{\circ}C$ 14.0%로 발아율이 나타났고, 토양에 파종한 종자는 온도에 관계 없이 80% 내외의 발아율을 보여, 잇꽃 종자의 발아에 수분공급 조건과 온도가 밀접하게 연관되어 있었다. 제(hilum)의 내부 구조를 SEM(scanning electron microscope)을 이용하여 관찰한 결과 도관요소를 구성하는 세포로 이루어져 있었다. 이러한 결과로 볼 때, 잇꽃 종자의 제(hilum)는 발아과정에서 수분흡수와 가스교환 통로가 되는 것으로 판단된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.160-161
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• 2021

To prepare polyurethane coatings for top coatings of automobiles, acrylic resins containing 75% of solids were synthesized by a radical polymerization. The viscosity of the acrylic resins was increased with increasing OH values. Crosslinked acrylic-urethane clear coatings were obtained by curing reaction between the synthesized acrylic resins and hexamethylene diisocyanate(HDI) trimer(Desmodur N-3600). The physical properties from the following studies were carried out : viscosity(Zahn cup #2), adhesion, pensil hardness, and 60° specular gloss. Various properties of the acrylic-urethane clear coatings as top coatings of mobile coat were evaluated on the coating specimens. Adhesion property to a substrate, 60° specular gloss, and pencil hardness of prepared paint showed quite good properties.

• 복식문화연구
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• 제14권5호
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• pp.813-827
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• 2006

In this investigation, the following study was carried out for an experimental proposal of the knit item lists which were not actualized due to lack of studies. First of all, we have put the knit item titles that have been used through the document investigation, into the lists in order to clarify the original item list. Furthermore, we have pointed out the problems and the areas to be developed in the original item lists, and proposed twenty new knit item lists. By defining the design traits of each item, we have established item list which could be classified more systematically. As a result, the knit item titles of twenty newly proposed item titles are knit pull over, knit pull over top, knit top, knit t shirt, knit shirt, knit polo shirt, knit blouse, knit vest, knit hood, knit jumper, knit jacket, knit coat, knit cardigan, knit ensemble, knit cape, knit shawl, knit bikini, knit one-piece, knit pants, and knit skirt. Secondly, in order to investigate the possibility of practical use of twenty knit item lists proposed by this study, we have applied anova with repeated measurement for foreign fashion collection knit item trends of the past 10 years based on the proposed item lists. As a result, four items classified as top, shirt, cardigan, and pants had similar changes in the trend for last 10 years in S/S season while eleven items classified as pull over, pull over top, blouse, vest, jacket, coat, cardigan, ensemble, cape, shawl, and one-piece had similar trend changes for F/W season. The first significance of this study is on the experimental proposal of knit item list which could be used in the actual clothing industry and academic field. Furthermore, by defining the design traits of each knit item, it sublated the confusions brought by vocabularies in design of knit products and distribution in the industry perspective, and it made it possible to categorize the knit items correctly in knit design analysis and knit design education in academic field. The second significance shows that this study brought about positive results in the possibility of industrial academic practical use of proposed list by indicating that most of the knit designs appeared in the foreign collections in the past ten years could be correctly classified through investigational analysis.

• 비파괴검사학회지
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• 제36권4호
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• pp.259-265
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• 2016

This paper presents a study on the use of pulsed phase thermography in the measurement of thermal barrier coating thickness with a numerical simulation. A multilayer heat transfer model was ussed to analyze the surface temperature response acquired from one-sided pulsed thermal imaging. The test sample comprised four layers: the metal substrate, bond coat, thermally grown oxide and the top coat. The finite element software, ANSYS, was used to model and predict the temperature distribution in the test sample under an imposed heat flux on the exterior of the TBC. The phase image was computed with the use of the software MATLAB and Thermofit Pro using a Fourier transform. The relationship between the coating thickness and the corresponding phase angle was then established with the coating thickness being expressed as a function of the phase angle. The method is successfully applied to measure the coating thickness that varied from 0.25 mm to 1.5 mm.

• 대한기계학회논문집A
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• 제31권6호
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• pp.665-670
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• 2007

Alpha-phase alumina TGO(Thermally Grown Oxide) forms on the interface between zirconia top coat and bond coat of thermal barrier coating system for superalloys during exposure to high temperature over $1000^{\circ}C$. It is known to provide a good protection against hot corrosion and to cause surface failure such as rumpling and cracking due to difference in thermal expansion coefficient from the substrate metal and the lateral growth. Consequently, mechanical properties of the alumina TGO at the high temperature are the key parameters determining the integrity of TBC system. In this work, by using Fecralloy foils as the alumina forming substrate, creep tests and tensile tests have been performed with various TGO thicknesses$(h=0{\sim}4{\mu}m)$ and yttrium contents(0, 200ppm) at $1200^{\circ}C$. Displacement-time curves and load-displacement curves for each TGO thickness(h=1,2,..) were measured from the creep and tensile tests, respectively, and compared with the curves without TGO thickness(h=0). As the result, the intrinsic tensile and creep properties of TGO itself were determined.

• Journal of the Korean Wood Science and Technology
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• 제27권3호
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• pp.31-38
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• 1999

본 연구는 재면이 약한 낙엽송재의 교실용 마루판으로의 재질개량의 일환으로 경도와 내마모성 등 표면성능의 개선을 도모하기 위한 표면강화처리기술을 개발하기 위하여 수행되었다. 낙엽송 마루판의 밑칠을 폴리우레탄 우드실러, 중간칠을 폴리우레탄 샌딩실러도료로 도장한 다음, 마감칠로써 자외선 (UV) 경화형 에폭시아크릴레이트수지도료와 우레탄아크릴레이트수지도료를 이용한 표면강화처리에 의해 경도, 내마모성, 부착성, 내충격성이 향상되었다. 이 처리에 의해 브리넬경도가 1.75에서 2.25~2.27로 개선되어 2.38의 참나무재와 유사한 경도치를 나타내었으며, 약 2배의 내마모성 증대효과가 나타났다. 외부충격에 의한 도막의 갈라짐은 거의 발생하지 않았으며, 에폭시아크릴레이트가 우레탄아크릴레이트에 비해 충격에 의한 크랙의 발생율이 적었다.

• 복식
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• 제19권
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• pp.209-240
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• 1992

The costume of any nation is an attribute of a culture. This study concerns chinese and Mongolian costume's 'collar' form according to the observation of some reports about import folk materials and the pictures of the genuine objects, the author has investigated and rearranged them focusing on 13th Century's. 1. Traditional OverCoat or National costume on the poing of won dynasty in china such as Jacket, Coat, Mantle for making classical matching color, lacing, pearl pieces, and all costume shall be properly decorated and disigned. The example, Chinese Women's Gown and Double Jacket, on top of alignment of plaid, focus shall be placed on chinese classical form and color-matching, such as flowers and bireds, butterflies, made wishing ornaments, which shall be either hand painted or embroidered on collars, fronts, sleeves openings, and lower portion of gown. 2. Mongolian Costume, the stone status of a person, are seen at the territory of the Republic of Mongolia was a powerful country of Asia. So during the Mongolian Empire a lot of Missions from many countries came to kharakorom for establishing official relations between Mongolia and a country represented by mission. In particularly, the costume of mongols on the point of Chinggis khan Empire which the upper clothes in cluded ; a several kinds of the Caftan as compared with in Korea as to material (Silk caftan, Cotton Caftan, Fur Caftan) with closing to the right due to overlapping and Stand-up-Shawl Collars will pancho style & Round or V Neckline. 3. As compared with in Korea it is said that this a sort of Simui was brought in prior to the middle of Koryeo dynasty. Korean Simui system was complied with chinese system through confucian domestic behaviour. This was respected for court dress of confucian scholars, as it was, Chumri can ordinary dress of schloars) and Hakchangui ( a uniform of confucian student). Generally its form or shape of the outer lapels of Korean jacket were used together Squar-Tray-Collar. In late Yi-dynasty the inside collar length was longer than the outside collar length and the width of the collar was gradually narrow. And so the Traditional costume's outer collar of Jacket and OverCoat became small while the width and length of breast-tie became large. The same thing as the form of the collar on these days had been appeared by the design method or adjust one's dress. Therefore the form of collar in the china and Mongolian Traditional OverCoat & National Costume is fix arranged according to Stand up Collar, Without Collar, Clothing to the Right, Central opening, Horizontal Row of Button with Round or V Neckline and so on.

• 한국세라믹학회지
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• 제55권6호
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• pp.608-617
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• 2018

The effects of the purity and monoclinic phase of feedstock powder on the thermal durability of thermal barrier coatings (TBC) were investigated through cyclic thermal exposure. Bond and top coats were deposited by high velocity oxygen fuel method using Ni-Co based feedstock powder and air plasma spray method using three kinds of yttria-stabilized zirconia with different purity and monoclinic phase content, respectively. Furnace cyclic thermal fatigue test was performed to investigate the thermal fatigue behavior and thermal durability of TBCs. TBCs with high purity powder showed better sintering resistance and less thickness in the thermally grown oxide layer. The thermal durability was found to strongly depend on the content of monoclinic phase and the porosity in the top coat; the best thermal fatigue behavior and thermal durability were in the TBC prepared with high purity powder without monoclinic phase.

• 열처리공학회지
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• 제20권4호
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• pp.195-202
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• 2007

Corrosion resistance and torque of M10 bolt coated with Magni 565 were investigated. Corrosion protection mechanism were also studied with the microstructure of coating film. The bolts with the optimum conditions showed around $10{\mu}m$ layer thickness, a great corrosion resistance in salt spray test and a proper torque in torque/tension test. But torque coefficient k increased with the number of bolting and clamping force of M10 bolt showed significantly lower than that of specified value 28.3kN. It was thought that the repeated bolting made the coating film peel off and powdery. The sample coated with optimum coating conditions showed more higher polarization resistance and corrosion potential than the specimens of top and base coat only. The base coating film was composed of lamellar zinc flakes, which provides a large sacrificial cathodic protection. Meanwhile, the top coating film was composed of organic aluminium pigments layer, which provides barrier protection to the corrosion circumstances.

• 한국표면공학회지
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• 제46권6호
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• pp.258-263
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• 2013

4 mol% Yttria-stabilized zirconia (4YSZ) coatings are fabricated by Air Plasma Spray (APS) and Electron Beam Physical Vapor Deposition (EB-PVD) with top coating of thermal barrier coating (TBC). NiCrAlY based bond coat is prepared as 150 ${\mu}m$ thickness by conventional APS (Air Plasma Spray) method on the NiCrCoAl alloy substrate before deposition of top coating. Each 4YSZ top coating shows different tribological behaviors based on the inherent layer structures. 4YSZ by APS which has splat-stacked structure shows lower friction coefficient but higher wear rate than 4YSZ by EB-PVD which has columnar structure. For 4YSZ by APS, such results are expected due to the sliding wear accompanied with local delamination of splats.