• Natural Product Sciences
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• 제19권3호
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• pp.251-257
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• 2013

We investigated the antithrombotic effect of Acorus gramineus Soland (A. gramineus) from Korea and Acorus tatarinowii Schott (A. tatarinowii) from China in a rat model of arterial thrombosis induced by ferric chloride ($FeCl_3$). Thirty minutes prior to a 35% $FeCl_3$ application, Sprague Dawley rats were intraperitoneally injected with saline, A. gramineus and A. tatarinowii (100 mg/kg), respectively. Occlusion time of rats injected with A. gramineus was delayed significantly compared to that of the vehicle and A. tatarinowii. Thrombus weight was meaningfully decreased in rats injected with A. gramineus compared to the vehicle. Additionally, A. gramineus inhibited collagen fiber damage in vessel compared to the vehicle, but A. tatarinowii did not show a significant effect. Our results show that A. gramineus and A. tatarinowii from the same genus have different antithrombotic effects, and especially A. gramineus has a better antithrombotic effect than A. tatarinowii.

• 복식
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• 제51권5호
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• pp.17-28
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• 2001

The purposes of this study were to arrange and analyze the Oriental Mode in 20th century fashion and to clarify that Oriental dress and its ornaments appearing as the main subject of Occident fashion gradually The results were as follows : First, Oriental Mode in 1900-1950s was prescribed as the 'Orientalism' to be expressed Occidental imperialistic viewpoint. Therefore, the Orient was used as the simple recording mark of the imperialism product or commercial motive and it was reflected in fashion. Second, it was explained in 1960-1970s as the 'Folklore Orientalism' that focus was moved into the folklore costume of Orient. Third, in 1980s, 'Ethnic' was conspicuous that reflected the traditional costume in the area of non-christianity. Especially, it was the decade that the Middle East attracted attention. Fourth, Oriental Mode in 1990s appeared as the 'Fusion' that Oriental and Occidental elements were mixed and compromised on equal terms. Fifth, it was expressed as a word 'Zen' that had natural fiber, moderate color and silhouette to be most basic and concise about human body at the end of 1990s. This study could confirm that the center of fashion was being converted into the Orient gradually. This may be understood as the pluralistic culture phenomenon. Namely, eclectic principle to recognize mutual style and individualistic nature and to utilize and mix was made, and this brought the conversion into Oriental sense of value.

• Composites Research
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• 제27권6호
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• pp.231-235
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• 2014

오토클레이브 성형은 성형제품의 품질은 우수하나 생산비용이 비싸다는 단점이 있다. 생산비용 중에서도 큰 비중을 차지하는 것이 성형툴의 제작공정이다. 따라서 본 연구에서는 생산비용 절감을 위한 선행 연구로서 성형툴의 재질 및 표면상태에 따라 L-shape 제품의 성형후 Spring-in을 Abaqus user subroutine을 이용하여 계산하였고, 열팽창계수와 마찰계수에 따른 결과를 나타내었다. 또한 성형툴 제작시 재질 및 표면상태의 기준점을 제시하여 생산비용을 줄이는데 기여하고자 한다.

• 한국화재소방학회논문지
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• 제15권2호
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• pp.53-58
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• 2001

본 연구에서는 조선 및 화학공장 등 산업현장에서 용접·용단작업 공정에서 비산 되는 불티에 의한 화재 예방을 위하여 불티 차단막에 관한 방염 및 난연 성능 평가를 실시하였다. 방염성능 실험결과 기존제품의 용접불티 차단막 6종 모두 충분한 방염성능을 갖고 있었다. 그러나, 용접·용단 불꽃에 의한 난연성 실험 결과 섬유유리에 수지코팅한 제품 2종은 용접·용단 불티에 대한 화재예방성능이 부족한 것으로 나타났다. 용접 불티 차단막의 최소산소지수의 국내기준은 30이상으로 고려하는 것이 좋을 것으로 사료된다. 용접 불티 차단막의 성능향상을 위한 제속적인 연구가 필요하며, 방염 및 난연성능 기술지침 개발의 기초자료로서 활용될 수 있을 것으로 사료된다.

• 펄프종이기술
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• 제40권4호
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• pp.66-73
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• 2008

When coated paperboard is printed, pressed into a groove with a creasing rule and folded, white line cracking occurs along the crease due to intensive mechanical pressure. The cracking will deteriorates product quality and waste resources. Effects of creasing pressure and ink dosage on the foldability of coated board were investigated. It was shown that applying an optimum pressure is important during creasing. When the pressure was too low, the crease formed was not sufficiently deep enough to enable precise folding. When an excess pressure was applied, fiber bonding was destroyed, resulted in unsatisfactory cracking. When the coated board was folded in machine direction (MD), long cracks were formed along MD. When it folded in cross direction (CD), the cracks were shorter and formed perpendicular to CD. Printing promoted cracking due to the decrease in flexibility of coated board. In addition, uneven ink film layer on the coating layer caused worse cracking.

• 한국의류학회지
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• 제41권4호
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• pp.771-781
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• 2017

The helmet is an imperative personal protective equipment. This protective device must be able to guard the human head against potential risks. Helmets are classified according into the purpose of use; therefore, the required performance and specifications depend on the type of products. Military helmets are intended to protect the wearer's head from bullets and shrapnel. Generally, lightweight super fibers and fiber reinforced composite materials are used as helmet shell materials, and NIJ STD of U.S. Department of Justice is most widely used as international standard related to bulletproof helmets. Safety helmets are widely used for industrial application and sports leisure. In general, the performance of shock absorption must be ensured, and various lining systems are applied in material, design, and combination methods. Evaluation standards have also been classified and strictly controlled for each purpose; therefore, it is difficult to certify with the existing standards such as the recently developed convergence helmets. However, it is possible to launch the product through a separate national integrated certification procedure.

• 한국생활과학회지
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• 제24권5호
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• pp.677-686
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• 2015

This study is to survey the concept of ultralight down jumpers examine customers' knowledge about ultralight down jumpers, factor effect when purchasing them, and satisfaction level. The research method is to examine a survey of consumer evaluation about ultralight down jumpers using a questionnaire targeting 240 men and women in their 30s and 40s. The results of the study are as follows. The knowledge Customers have about ultralight down jumpers appeared low scores in most items; 62.1%9(2.28)) answered 'does not know' in the item of 'knows about the mixed composition rate of filler', 54.6%(2.49) answered 'does not know' in the item of 'knows about ultralight materials', and 52.5%(2.56) answered 'does not know' in the item of 'knows about filling rate'. The important factors to consider when purchasing were 'size and pattern'(4.34), 'color'(4.32), 'design and price'(4.30). About satisfaction, 66.7%(3.69) answered 'most satisfied' in the item of 'well-fitting(wearing) sensation' and 60.0%(3.63) answers 'satisfied' in the item of 'activity and easy-to-wear'.

• 한국기계가공학회지
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• 제16권6호
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• pp.133-138
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• 2017

Recently, CFRP composites are widely used as lightweight materials have with excellent mechanical properties and can beare widely used in various fields. In general, thermosetting resins are used for CFRP. However, in recent years, studies have been carried out using thermoplastic resins have been actively carried out to overcome the disadvantages of thermosetting resins. The LFT-D system is a molding method in which a fiber is directly cut to a the desired length while being impregnated with a thermoplastic resin to produce a compound and that is then press-molding molded to form the product. In this paper, before the production of the trailing arm, the compression molding analysis was carried out in order to grasp the problems that may occur during production. Through cCompression molding analysis was applied to calculate of the minimum press pressure and to compare and analysis analyze the molding conditions characteristic required to formfor forming the trailing arm.

• Earthquakes and Structures
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• 제9권5호
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• pp.1069-1089
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• 2015

This paper investigates the limits and efficacies of the Fiber Reinforced Polymer (FRP) material for strengthening mid-rise RC buildings against seismic actions. Turkey, the region of the highest seismic risk in Europe, is chosen as the case-study country, the building stock of which consists in its vast majority of mid-rise RC residential and/or commercial buildings. Strengthening with traditional methods is usually applied in most projects, as ordinary construction materials and no specialized workmanship are required. However, in cases of tight time constraints, architectural limitations, durability issues or higher demand for ductile performance, FRP material is often opted for since the most recent Turkish Earthquake Code allows engineers to employ this advanced-technology product to overcome issues of inadequate ductility or shear capacity of existing RC buildings. The paper compares strengthening of a characteristically typical mid-rise Turkish RC building by two methods, i.e., traditional column jacketing and FRP strengthening, evaluating their effectiveness with respect to the requirements of the Turkish Earthquake Code. The effect of FRP confinement is explicitly taken into account in the numerical model, unlike the common procedure followed according to which the demand on un-strengthened members is established and then mere section analyses are employed to meet the additional demands.

• Applied Microscopy
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• 제28권4호
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• pp.539-549
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• 1998

The silk glands of the spiders are of several types. Among the several types of spider's silk glands, the principal fibers used in constructing the eggcase are products of the tubuliform glands (TBG), which are present only in females. Development of these glands parallels maturations of the ovaries and fat bodies. In order to understand the mechanism of eggcase-silk production, this paper has examined the fine structural changes of the TBG during the period of egg maturation in the garden spider, Argiope aurentia. Between the two kinds of secretory granules observed in the glandular epithelium of the mature TBG, the electron-dense granules which have paracrystalline structure are revealed to be the precursors of the eggcase silk fibers. During the production of eggcase, rapid release of the secretory product occurs at apical surface by the mechanism of apocrine secretion. Moreover, secondary lysosomes appear due to the rapid disorganization of cellular components during the eggcase formation. Examinations of formed fibers indicate a multicomponent internal structure, and electron micrographs reveal each fiber contains numerous electron lucent fibrils embedded in an amorphous electron dense matrix. The secretory precursors are produced as separated vesicles via well-oriented rER, and no Golgi complex has been found in the glandular epithelial cells.