• 한국의상디자인학회지
• /
• 제19권3호
• /
• pp.63-74
• /
• 2017

This study aims to contribute to the development of male incontinence underwear with an anti-aging effect that meets customer requirements by examining the types, sorts, sizes and specifications of male incontinence underwear currently sold on the market. The results of an analysis of a total of eight commercial products are as follows. 1) Among the samples, six types of incontinence underwear were of a pull-on style like regular underwear; two types were of a pad insertion style. With respect to the underwear design, four (50%) types of incontinence underwear were brief style. The rest were drawers (3, 37.5%). Only one was of a trunk (12.5%) style. 2) With respect to size, the percentage of Size 3 was 50%, followed by Size 4 (50%). Most of the size of the underwear uses hip measurement whereas Japanese products (3, 37.5 %) use waist circumference. 3) With respect to the materials of the incontinence underwear, natural fibers such as cotton were mostly used and a polyurethane or polyester was mixed to enhance the wearing sensation and stretchability of the underwear. Finally, for the structure of the pad area, a napping finish was the largest (3, 37.5%), single knit 2(25%), twill weave 2(25%), and rib weave 1.

• 센서학회지
• /
• 제22권6호
• /
• pp.400-403
• /
• 2013

The piezoelectric composite film of ferroelectric PZT ceramic ($PbZr_xTi_{1-x}O_3$) and polymer (PDMS, Polydimethylsiloxane) was prepared to improve the flexibility of piezoelectric material. The bar coating method was applied to fabricate flexible nanocomposite film with large surface area by low cost process. In the case of using metal electrode on the composite film, although there is no problem by bending process, the electrode is usually broken away from the film by stretching process. However, the well-attached, flexible CNT electrode on PZT/PDMS film improved flexibility, especially stretchability. PZT particles was usually settled down into polymer matrix due to gravity of the weighty particle, so to improve the dispersion of PZT powder in polymer matrix, small amount of additives (CNT powder, Carbon nanotube powder) was physically mixed with the matrix. By stretching the film, an output voltage of PZT(70 wt%)/PDMS with CNT (0.5 wt%) was measured.

• 한국의류학회지
• /
• 제31권1호
• /
• pp.77-84
• /
• 2007

The purpose of this study was to investigate and to compare the performances of silicone laminated materials sold for swimming cap in market, to get the basic data for product development. We selected 4 specimens and tested their air permeability, waterproofness and breathability. We also tested the physical and mechanical properties of the specimens using KES system. Silicone-laminated material was not bursted on high hydraulic pressure since silicone membrane gave waterproofness while PU/Polyester substrate gave elasticity. It didn't have air permeability and breathability at all. Any toxic materials such as Formaldehyde, Deldrin, PCP, Amin, TDBPP were not detected in silicone-laminated material and other materials. Silicone-laminated material had higher stretchability with the low force but it had lower elastic recovery and shape stability comparing to PU laminated material. It had lower flexibility than PU laminated material. It had lower unrecoverable amount in shearing direction. Friction coefficient was higher in silicone-laminated material than PU laminated material due to its surface stickiness. It was compressed easily and its compression resiliency was higher with compared to PU laminated material.

• 한국전기전자재료학회논문지
• /
• 제36권5호
• /
• pp.525-530
• /
• 2023

Stretchable piezoelectric energy harvester (S-PEHs) based on composite materials are considered one of the potential candidates for realizing wearable self-powered devices for smart clothing and electronic skin. However, low energy conversion performance and expensive stretchable electrodes are major bottlenecks hindering the development and application of S-PEHs. Here, we fabricated the S-PEH by adopting the piezoelectric composites with enhanced stress transfer properties and kirigami-patterned textile electrodes. The optimum contents of piezoelectric BaTiO₃ nanoparticles inside the carbon nanotube/ecoflex composite were selected as 30 wt% considering the trade-off between stretchability and energy harvesting performance of the device. The final S-PEH shows an output voltage and mechanical stability of ~5 V and ~3,000 cycles under repeated 150% of tensile strain, respectively. This work presents a cost-effective and scalable way to fabricate stretchable piezoelectric devices for self-powered wearable electronic systems.

• 한국생활과학회지
• /
• 제22권4호
• /
• pp.637-650
• /
• 2013

The purpose of this study was to examine the consumers' image and factors of wear comfort, expectation and satisfaction levels of wear comfort of hiking gear in order to investigate the consumer perception of wear comfort of hiking gear. The questionnaires were distributed to 400 people in their 40s and 50s and, 260 of which were used to data analysis. The questionnaires were comprised of questions about the image, factors, expectation and satisfaction levels of wear comfort of hiking gear, and demographic characteristics. Data were analyzed by frequency analysis, factor analysis, reliability analysis, correlation analysis, ANOVA, Duncan test, T-test with SPSS 19.0 IBM for Windows. In demographic characteristics, 43.5% of respondents were male and people under 45 years of age were at 17.7%, those between 46 and 50 with 46.5%, those between 51 and 55 with 28.9%, those between 56 and 60 with 6.9%. The results of this study are as follows. Responses of male and female consumers to image of wear comfort were similar and ten or more mentioned reponses by men were well-being and freedom from pain, stretchability, light weight, absorption of sweat, softness. Wear comfort of hiking gear was shown to include mobility/pressure factors, moisture factor, psychological factor, tactile/keeping body temperature factors. It was shown that the expectation and satisfaction levels of wear comfort of hiking gear were relatively high and were not influenced by consumer's sex and age, but were affected by the objective of mountaineering.

• 마이크로전자및패키징학회지
• /
• 제24권3호
• /
• pp.19-26
• /
• 2017

Polydimethylsiloxane (PDMS) 기판과 금속박막 사이의 중간층으로 parylene F를 사용한 신축패키지 구조에서 Au, Pt, Cu 박막의 신축변형에 따른 저항변화를 분석하였다. Parylene F 중간층을 코팅한 PDMS 기판에 스퍼터링한 150 nm 두께의 Au 박막과 Pt 박막은 각기 $1.56{\Omega}$ 및 $5.53{\Omega}$의 초기저항을 나타내었으며, 30% 인장변형률에서 각 박막의 저항증가비 ${\Delta}R/R_o$은 각기 7 및 18로 측정되었다. Cu 박막은 $18.71{\Omega}$의 높은 초기저항을 나타내었으며 인장변형에 따라 저항이 급격히 증가하다 5% 인장변형률에서 open 되어, Au 박막과 Pt 박막에 비해 매우 열등한 신축 특성을 나타내었다.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
• /
• pp.389.2-389.2
• /
• 2014

Polydimethylsiloxane (PDMS) based electronic devices are widely used for various applications in large area electronics, biomedical wearable interfaces and implantable circuitry where flexibility and/or stretchability are required. A few fabrication methods of electronic devices directly on PDMS substrate have been reported. However, it is well known that micro-cracks appear in the metal layer and in the lithography pattern on a PDMS substrate. To solve the above problems, a few studies for fabrication of stiff platform on PDMS substrate have been reported. Thin-film islands of a stiff region are fabricated on an elastomeric substrate, and electronic devices are fabricated on these stiff islands. When the substrate is stretched, the deformation is mainly accommodated by the substrate, and the stiff islands and electronic devices experience relatively small strains. Here, we report a new method to achieve stiff islands structures on an elastomeric substrate at a various thickness, as the platform for stretchable electronic devices. The stiff islands were defined by conventional photolithography on a stress-free elastomeric substrate. This technique can provide a practical strategy for realizing large-area stretchable electronic circuits, for various applications such as stretchable display or wearable electronic systems.

• 한국식품영양과학회지
• /
• 제46권7호
• /
• pp.841-847
• /
• 2017

본 연구에서는 새싹보리를 첨가하여(1, 2%) 스트링치즈를 제조하고 품질 특성을 검토하였다. pH는 새싹보리를 첨가한 스트링치즈에서 낮은 값을 보였으며 첨가 농도에 따른 유의적 차이는 보이지 않았다. 아미노산 함량은 새싹보리를 첨가함에 따라 threonine, cysteine, tyrosine, arginine, alanine, proline, lysine, isoleucine, leucine, glutamic acid 등의 함량이 비례적으로 증가하였고, 총 아미노산 함량도 대조구에 비하여 새싹보리 2% 첨가 치즈에서 높았다. 색도는 L*(명도)와 a*(적색도)에서 새싹보리 첨가량이 증가함에 따라서 낮아지는 경향을 보였으며, b*(황색도)는 증가하는 경향을 보였다. 물성의 경우 새싹보리 첨가량이 증가할수록 경도와 검성, 씸힙성은 유의적으로 높게 나타났으며, 반대로 응집성은 낮아지는 경향을 보였다. 또한, 신전성 측정 결과 새싹보리를 첨가하지 않은 스트링치즈보다 새싹보리 첨가 스트링치즈의 신전성이 증가함을 확인하였다. 총 페놀 함량은 새싹보리 2% 첨가 치즈에서 유의적으로 높은 값을 보였으며, 총 플라보노이드와 DPPH 라디칼 소거능은 유의적 차이를 보이지 않았다.

• 자연과학논문집
• /
• 제8권1호
• /
• pp.145-151
• /
• 1995

건열일축연신법에 의한 합성섬유의 연신은 높은 유리전이온도 때문에 대략 $150^{\circ}C$이상의 온도에서 행하여 지고 있다. 그러나, 팽윤습열연신법은 유기용매를 팽윤제로 사용하여 미세구조를 변화시키기 때문에 낮은 온도에서 연신 할 수 있는 특징을 갖고 있다. 본 연구에서는 비교적 낮은 온도인 $70^{\circ}C$에서 팽윤습열 일축연신에 의한 100% 아크릴섬유의 고강도화에 대하여 연구하였다. 연신능력은 연신일에 의하여 계상하였으며, 이 연신일은 연신응력과 변형 그리고 초기영율에 의하여 좌우됨을 알 수 있었다. 연신은 아크릴 섬유의 고강도를 위해 필요한 요인임을 확인할 수 있었다. 또한, 아크릴 섬유의 고강도화를 위한 분자배향도 및 결정화도 증가에 따른 연신조건의 효과와 물성 변화에 대하여 비교. 검토하였다.

• 소성∙가공
• /
• 제19권6호
• /
• pp.337-343
• /
• 2010

Current need of weight reduction in automotive part increases the application for high strength steel (HSS). The various types of high strength steels have been used to produce chassis part, control arms and trailing arms for weight reduction and increasing of fatigue durability such as dual phase steel (DP) and ferrite bainite steel (FB). But, DP and FB steels have proven to show inferiority in durability as well as press formability. Edge cracking occurred often in flange forming and hole expansion processes is the major failure encountered. This paper discussed the behavior of edge stretchability of high strength steel of DP and FB steels. Experimental works have been conducted to study the effect of punch clearance and burr direction on hole expansion ratio (HER). Also finite element simulation (FEM) has been preformed to clarify the mechanism of flange crack and support the experimental results on HER of DP and FB steels. It was simulated the whole process of blanking process following by hole expansion process and ductile fracture criterion named the modified Cockcroft-Latham model which was used to capture the fracture initiation. From the hole expansion tests and FEM simulation studies it was concluded that ferrite bainite steel showed better stretch-flangeability than dual phase steel. It was attributed to the lower work hardening rate of ferrite bainite steel than dual phase steel at the sheared edge.