• Elastomers and Composites
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• 제29권5호
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• pp.444-452
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• 1994

Emulsion graft copolymerizations of vinyl monomers, butyl acrylate(BA), methyl methacrylate(MMA), 2-ethylhexyl acrylate (EHA), glycidyl methacrylate (GMA), 2-hydroxyethyl methacrylate(HEMA), methacrylonitrile(MAN), dimethylaminoethyl methacrylate(DAMA) or 2-vinyl pyridine(VP), onto carboxyl-terminated SBR latex were carried out under different experimental conditions. In case of synthesizing SBR-g-poly(butyl acrylate), the degree of grafting was increased with increasing the amount of emulsifier, polymerization temperature and the amount of initiator. Pull-out strength of resorcinol-formaldehyde-latex(RFL) adhesives formulated with modified latexes was very higher than that of RFL adhesive formulated with ungrafted latex. When the modified latexes with GMA, HEMA, MAN, DAMA or VP were used, the break occurred at cords. Peel strength of RFL adhesives formulated with SBR-g-poly(GMA), SBR-g-poly(HEMA) or SBR-g-poly(VP) was higher by about 1.3 times than that of RFL adhesives formulated with unmodified SBR against nylon cord and was higher by about 2.0 times against polyester cord.

• Elastomers and Composites
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• 제31권2호
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• pp.104-110
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• 1996

The polyurethane was synthesized by the reaction of polycaprolactone diol(Mw 2000), 4,4'-diphenylmethane diisocyanate and 1,4-butanediol as the chain extender. Also, the modified polyurethane polymers based on liquid polybutadiene as a part of soft segment and dimethylolpropionic acid as a chain extender, giving polyurethane with various polarity, were synthesized. The thermal, mechanical, adhesion properties and water contact angles of the polyurethanes were examined. From the result of the water contact angle, the polarity of the acid modified PU containing 6% acid content was unchanged but mechanical and adhesion properties were improved. The water contact angles on polybutadiene modified PU films were increased with increasing polybutadiene content. The mechanical properties of the polybutadiene modified PU were higher than that of acid modified PU. However, the mechanical properties were reduced as polybutadiene content increased. The result is presumably due to phase separation between hard segment and soft segment. The peel strength of the polyurethane introduced with 5wt% polybutadiene was improved about 150% than that of unmodified PU. The same as the mechanical properties, the more polybutadiene was introduced, the lower peel strength was obtained.

• Elastomers and Composites
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• 제56권4호
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• pp.201-208
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• 2021

In this study, the effect of petroleum resin on the mechanical strength, morphology, and vibration damping characteristics of natural rubber (NR) composites was observed. The NR composites plasticized by adding petroleum resin showed decreased hardness and mechanical properties. A morphology analysis indicated that as the amount of petroleum resin increased, carbon black aggregates (or agglomerates) observed at the fracture surface decreased, resulting in an improvement in the dispersibility. In addition, as 20 phr of petroleum resin was added, the effective damping temperature range increased by approximately 11.4%, the hysteresis loss rate increased by 15.2%, and the resilience decreased by 36.6%. Therefore, it was confirmed that the vibration damping characteristics improved with the addition of petroleum resin. This was because the rubber-filler interaction between the NR molecular chain of the NR composite and the carbon black particles improved by the addition of petroleum resin.

• 한국의류산업학회지
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• 제22권2호
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• pp.202-208
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• 2020

This study is to help produce highly comfortable and wearable and footwear based on the establishment of basic data for manufacturing elderly footwear patterns and products. For this, a survey of 207 women in their 20s and 60-70s was conducted to identify the wearing of shoes, inconvenience areas, purchase practices and footwear preferences by age group. The results are as follows. First, the average age of the young female group was 22.5 years old, the elderly female group was 68.8 years old, and the average shoe size was 236.3 mm for the young female group and 238.3 mm for the elderly female group. Second, young women wore shoes for a longer time than elderly women, resulting in swollen and numb legs, hardened soles, uncomfortable toes and sore heels. However, elderly women felt more uncomfortable wearing footwear than young women. They suffered pain in the joint area, heal and toe areas as well as had more toe deformations due to aging. Third, all age groups preferred athletic shoes and loafers as well as purchases from footwear brand stores and department stores. The elderly spent more money on shoes, longer time to buy and valued the feeling of wearing, whereas the young considered design first. Fourth, both age groups prefer low-heels and natural leather, the young preferred to wear various types of shoes; however, the elderly are found to desire shoes that are comfortable and stable in both form and wearing.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 춘계학술대회 논문집
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• pp.56-56
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• 2002

ERP 시스템 내에는 각 업종별로 특성에 맞는 업무 프로세스가 구현되어 있어야 함은 필수 불가결한 요소이다. 그러나, 범용 ERP 시스템은 거의 대부된 OEM 생산방식에 의존하고 있는 국내 중소 신발업체의 생산관리 방식과는 맞지 않는 부분이 너무 많다. 그러므로 신발제조회사의 현황에 맞는 ERP 시스템의 개발이 절실하다. 이를 위해서 첫째, 시스템 개발을 위한 신발생산용 업무 프로세스가 표준화되어야 하고 둘째, 프로그램 작성을 위한 표준업무 프로세스에 기초한 통합시스템 프로세스의 모형이 설계되어야 한다. 본 논문에서는 국내 신발제조업체들의 생산관리방식에 적합하고 신발생산 전용의 자원관리 시스템의 개발과 도입을 위한 기초로서 BPR의 수행과 표준 업무 프로세스를 구축하는 방법을 제안하였다. 그리고 이에 따른 신발생산 자원관리 시스템의 프로세스 모형을 제시하였다. 이 연구는 ERP 시스템 중 생산 자원계획을 위한 통합 프로세스 모형의 구축에 초점이 맞추어져 있으며 통합 프로세스 모형은 13개 모듈로 구성되었다.

• 한국염색가공학회지
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• 제32권3호
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• pp.167-175
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• 2020

In this study, the optimum conditions for manufacturing PVDF nano web according to various electrospinning conditions such as solution concentration and applied voltage conditions were confirmed. The optimum spinning conditions were studied by analyzing the changes in the radioactivity of PVDF/TiO₂ nano web according to the TiO₂ content and the content of β-phase closely related to the piezoelectric properties under established conditions. As a result, it was confirmed that the concentration of the spinning solution was 20 wt%, the applied voltage was 25 kV, and the TiO₂ content was 5 phr. PVDF nano web and PVDF/TiO₂ nano web were observed morphologies through Scanning Electron Microscope(SEM) analysis. Formation of β-phase by electrospinning was confirmed by Fourier transform infrared spectroscopy(FT-IR) and X-ray Diffractometer(XRD), and the effect of the trapped nano web structure on the piezoelectric properties was investigated.

• 대한가정학회지
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• 제28권1호
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• pp.21-41
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• 1990

All the cultures are enriched and developed themselves through the contact with another culture, which propagate and transplant its new cultural elements to a time-honoured tradition. Therefore, the investigation of the origin of each culture means to find out the all the elements of each culture itself in the end. In Korean Costume, we can find both the Costume of frizid jone and that of temperate jone togther, effected by the influence of typical continental climate. Accordingly, we can also realize that both Lee, of southern tribe and Haw, of northern tribe suitable for the protection of cold weather, existed in Korea. Even Lee and Hwa were used together, Hwa had been appeared earlier than Lee along with the Skitai Costume and we can find its origin in the line of Skitai costume. In Central Asia, Tadjhik was the only race tracing their ancestry from ancient Iranic genuinely and they had been keeping the culture of Skitai origin continuously. The purpose of this thesis is to examine Korean's own culture of the footwear through the investigation of Tadjhik's culture of costume, specially through the culture of Tadjhik footware. To reach the conclusion of this thesis, the comparision and investigation between Korea and Tadjhik was made carefully for the followings, culture of life and costume, forms and materials of footwear. 1. The treasers and boots made by leather and felt was the origin of costume culture of Central Asia and aboves were appeared in persian costumn for the first time. We can consider that those had connection with Korean culture of costume. 2. Form of Tadjhik footwear can be devided by hwa and Lee, and there was a big difference in form between that of mountain area and plain area. We can find more rariety in footwear of mountain area. 3. If we compare the form of Hwa and Lee of Tadjhik with our own footwear, we can find out many things in common and there are lots of similarities particularly in form and material. 4. We can say that the difference of Tadjhik and Korean was the preference of Hwa for Tadjhik and Lee for Korean, aboves came from the different totography, climate condition and life style. 5. The form of male and female footwear of tadjhik was almost similar, but female footwear had various and beautiful decorations for the ornament. 6. The materials of Tadjhik footwear was mostly leather, and Hwa was used particularly for labour purposes. 7. We can expect that Tadjhik of Central Asia and Korea had a similar orgin and style on the footwear. It can be expected that we can find out many common things in further investigation of the study of Tadjhik costume and will exert the examination continuously.

• 분석과학
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• 제30권6호
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• pp.303-311
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• 2017

잠재지문 증강시약인 1,2-indandione (1,2-IND) 용액을 사용하여 종이에 유류된 족적의 형광을 얻는 방법을 연구하였다. 인쇄물이 출력된 A4 용지에 유류된 dry origin 및 wet origin 족적에 아미노산의 일종인 DL-alanine 용액과 아미노산 검출시약인 1,2-IND 용액을 뿌려서 DL-alanine-1,2-IND 이성분착물을 만들었다. 이 이성분착물은 족적에 있는 미량의 금속성분과 반응하여 광발광을 내는 삼성분착물을 형성함으로써 족적의 형광을 관찰할 수 있었다. 그러나 1,2-IND 용액 대신 5-methylthioninhydrin (5-MTN) 용액을 이용하면 처리 조건을 동일하게 유지해도 족적의 형광이 일정하게 관찰되지 않았다. DL-alanine 용액과 1,2-IND 용액으로 처리한 족적을 다양한 온도조건 (30, 40, $50^{\circ}C$)과 다양한 습도조건 (30, 40, 50, 60 % RH)에서 보관한 결과 온도와 습도가 높을수록 족적과 바탕면의 대조비가 감소하였다. DL-alanine 용액과 1,2-IND 용액으로 처리한 족적을 $30^{\circ}C$, 30 % RH에서 1 h 동안 보관하면 족적의 최적 형광을 얻을 수 있었다. 저자들이 개발한 방법의 감도를 black gelatin lifting, 2,2'-dipyridil 용액 처리 방법, 8-hydroxyquinoline 용액 처리방법의 감도와 비교하였다. 그 결과 저자가 개발한 방법의 감도는 gelatin lifting 방법보다는 떨어졌으나 2,2'-dipyridil 용액 혹은 8-hydroxyquinoline 용액 처리방법보다는 우수하였다.

• 디자인학연구
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• 제12권1호
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• pp.5-12
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• 1999

본 연구는 편형별 아파트의 신발장에 대한 실태를 조사하여 향후 아파트 분양 시 제공되는 신발장의 기초자료를 제공하고 디자인 제안을 하는데 목적을 두었다. 이를 위해 현재 아파트 신발장의 사용실태, 거주자 만족도, 실측을 통한 신발장의 규모 및 내부구성 등을 파악하였고, 이를 근거로 각 평형별 신발장을 제안하였다. 제안의 초점은 우선 각 수납물품의 종류에 따라 가구의 내부 구성을 달리한 유니트를 개발한 후 이를 모듈화 한다는 것이다. 모듈의 단위는 거주자들의 불만요인을 분석하는 한편 일반적인 신발외 길이, 폭, 높이에 의거하였으며 이를 가족의 수나 수납물품의 양 그리고 아파트 규모에 따라 자유롭게 선택할 수 있도록 하였다. 본 연구에서는 이에 대한 여로 각 평형에 따라 일반적인 신발장의 규모를 설정하고 필요한 유니트를 선택한 결과를 제시하였다.

• Elastomers and Composites
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• 제51권1호
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• pp.24-30
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• 2016

Sole in the footwear usually modified with foaming agent on the polymer resin to improve the lightweightness and crush-cushion effect. In this study, we investigated rheological properties for polymer resin filled with the different type and concentration of foaming agent, capsule type foaming agent and organo-chemical foaming agent, under the time sweep test. Curing times of each polymer resin with different kind of foaming agent are delayed than reference material (epoxy resin with curing agent). In case of adding capsule type foaming agent, however, there is appropriate concentration to reduce the curing time, relatively. When foaming agent is activated, foaming force inflates the sample in contrast to condensation force of curing and then axial normal force develop to the (+) direction. Interestingly, by increase concentration of foaming agent, there is a specific point to break down the axial normal force development. The reason for this phenomenon is that coalescence of foams induce the blocking of axial normal force development.