• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.32 no.6
• /
• pp.477-482
• /
• 2019

This study investigated the influence of the viscoelastic property of slag when producing glass fiber, MFS631 with 60% of manganese slag, 30% of steel slag, and 10% of silica stone. To fabricate the MFS631 glass bulk, slag materials were placed in an alumina crucible, melted at $1,550^{\circ}C$ for 2 h, and then annealed at $600^{\circ}C$ for 2 h. It was found that glass is non-crystalline through X-ray diffraction analysis. MFS631 fiber was produced at speed in the range of 100~300 rpm at $1,150^{\circ}C$. The loss modulus (G") and storage modulus (G') of the produced glass fiber were evaluated at high temperatures. G' and G" of MFS631 were greater than $893^{\circ}C$, and the modulus value was 136,860 pa. This is similar to the results of a general E-glass fiber graph. Therefore, it was concluded that its spinnability is similar to that of E-glass fiber; therefore, it can be commercialized.

• Journal of Digital Convergence
• /
• v.16 no.3
• /
• pp.457-468
• /
• 2018

The purpose of this study was to investigate the effect of yoga self-help management program on the health status and depression of patients with fibromyalgia syndrome. The subjects who participated in the study were patients diagnosed with fibromyalgia syndrome at a university hospital in G city. The total number of participants was 43, 21 in the experimental group and 22 in the control group. For the experimental group, a total of 16 yoga self-help management programs were held twice a week for eight weeks at the yoga center, and yoga DVDs, photographs, and educational booklets developed for the home were provided. The control group was subjected to pre - test and post - test without intervention. Data were analyzed using SPSS/WIN 18.0 program. As a result of the study, it was found that the experimental group had significantly improved health status(Tender point, FIQ) and the depression was lower than the control group, which was effective in the intervention strategy of the fibromyalgia syndrome patients.

• Smart Media Journal
• /
• v.10 no.4
• /
• pp.28-34
• /
• 2021

Drape is one of the factors that determine the shape of clothes and is one of the very important factors in the textile and fashion industry. At a time when non-face-to-face transactions are being activated due to the impact of the coronavirus, more and more companies are asking for drape value. However, in the case of small and medium-sized enterprises (SMEs), it is difficult to measure the drape, because they feel the burden of time and money for measuring the drape. Therefore, this study aimed to generate a drape image for the material property value input using a conditional adversarial neural network through 3D simulation images generated by measuring digital properties. A drape image was created through the existing 736 digital property values, and this was used for model training. Then, the drape value was calculated for the image samples obtained through the generative model. As a result of comparing the actual drape experimental value and the generated drape value, it was confirmed that the error of the peak number was 0.75, and the average error of the drape value was 7.875

• Korean Journal of Materials Research
• /
• v.34 no.3
• /
• pp.175-183
• /
• 2024

Geopolymer, also known as alkali aluminum silicate, is used as a substitute for Portland cement, and it is also used as a binder because of its good adhesive properties and heat resistance. Since Davidovits developed Geopolymer matrix composites (GMCs) based on the binder properties of geopolymer, they have been utilized as flame exhaust ducts and aircraft fire protection materials. Geopolymer structures are formed through hydrolysis and dehydration reactions, and their physical properties can be influenced by reaction conditions such as concentration, reaction time, and temperature. The aim of this study is to examine the effects of silica size and aging time on the mechanical properties of composites. Commercial water glass and kaolin were used to synthesize geopolymers, and two types of silica powder were added to increase the silicon content. Using carbon fiber mats, a fiber-reinforced composite material was fabricated using the hand lay-up method. Spectroscopy was used to confirm polymerization, aging effects, and heat treatment, and composite materials were used to measure flexural strength. As a result, it was confirmed that the longer time aging and use of nano-sized silica particles were helpful in improving the mechanical properties of the geopolymer matrix composite.

• Proceedings of the CALSEC Conference
• /
• 2001.02a
• /
• pp.477-486
• /
• 2001

⊙ '99. 12 - '00. 8 : 전자 4사 중심 표준화 추진 ㆍ 부품표준화 ㆍ EDI ㆍ 공개구매 및 전자입찰 ⊙ '00. 8. 30: 부품 및 EDI 표준(안) 공청회 및 W/G Kick Off 실시 ㆍ 내역 - 부품분류체계 및 특성항목 ; Level 1(59), Level 2(287), Level 3(361), Level 4(105) - 20종 EDI; 견적 4종, 주문 4종, 납품 5종, 입고 4종, 세금계산서 3종 - 22품종 W/G 발족 ㆍ 장소; 강남 섬유센터(10:30-16:00) ㆍ 참석업체 ; LG전자, 삼성전기외 65여 업체, 107명 참석, ⊙ '00. 9-'00.9 : e-Catalogue 부품표준화 추진 (22품종) ⊙ '00. 10-'00.12 : e-Catalogue 추진 범위 확대 ⊙ '00. 12. 19 : 1차 대상품종 e-Catalogue 표준 확정 ⊙ '01. 1 - : 2차 대상품종 e-Catalogue 표준화 추진(12품종)(중략)

• Journal of Adhesion and Interface
• /
• v.23 no.3
• /
• pp.59-69
• /
• 2022

In composite materials, the adhesion and interfacial properties were the most important factors to obtain high performance of mechanical properties. This review paper had been focused on the micromechanical evaluation methods for the interfacial property historically. The interfacial property of fiber-reinforced composites (FRC) could be evaluated using only a single fiber and matrix via various micromechanical testing methods. Self-sensing due to the fracture behavior of FRC could be determined and discussed more critically and clearly using electro-micromechanical evaluation. In this paper, the research trends for micro-mechanical evaluation of composites was summarized, and their practical applications would be suggested in the future.

• The Science & Technology
• /
• v.35 no.12 s.403
• /
• pp.94-95
• /
• 2002

창립 50주년 기념식 및 추계연구발표회 '대한조선학회'/방사선생명과학회 창립 총회 및 기념 심포지움 개최 '방사선생명과학회'/제3회 한림원상 수상자발표/국가기술지도 공청회 개최/"성장호르몬 분비를 촉진시켜 주는 섬유 등장" 원광대학교 의과대학 통합의학센터/중증 장애인, 집에서 정보화 교육 받는다/국토환경지도 최초 제작

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.25 no.6
• /
• pp.209-217
• /
• 2021

This paper investigates the effect of high strength hooked-end steel fiber content and aspect ratio on the compressive and flexural performance of concrete. A total of ten mixtures were prepared and tested. Concretes with specific compressive strength of 30 MPa were reinforced with three different aspect ratios (l/d) of steel fibers 64, 67, and 80 and three different percentages of steel fibers 0.25, 0.50, and 0.75% by volume of concrete. Tensile strengths of steel fibers with l/d of 64, 67, and 80 are 2,000, 2,400, and 2,100 MPa, respectively. The compressive and flexural properties of plain and steel fiber-reinforced concrete (SFRC) mixtures were evaluated and compared. The experimental results indicated that the incorporation of high-strength hooked-end steel fibers had significant effects on the compressive and flexural performance of concrete. With the increase of steel fiber content, compressive performances, such as Poisson's ratio and toughness, of concrete were improved. The steel fibers with the least l/d of 67 resulted in a larger enhancement of compressive performances. The residual flexural strength, that is, post-cracking flexural resistance and toughness, of concrete is mainly depended on the dosage and aspect ratio of steel fibers. The residual flexural strength at serviceability (SLS) and ultimate limit state (ULS) defined in fib Model Code 2010 (MC2010) is increased as the fiber content and aspect ratio increase.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.25 no.3
• /
• pp.40-47
• /
• 2021

This study investigates the influence of hooked-end steel fiber volume fraction and aspect ratio on the mechanical properties, such as compressive and flexural performance, of concrete with specified compressive strength of 30MPa. Three types of hooked-end steel fibers with aspect ratios of 64, 67 and 80 were selected. The flexural tests of steel fiber reinforced concrete (SFRC) prismatic specimens were conducted according to EN 14651. The compressive performance of SFRC with different volume fractions (0.25, 0.50 and 0.75%) were evaluated through standard compressive strength test method (KS F 2405). Experimental results indicated that the flexural strength, flexural toughness, fracture energy of concrete were improved as steel fiber volume fraction increases but there is no unique relationship between steel fiber volume fraction and compressive performance. The flexural and compressive properties of concrete incorporating hooked-end steel fiber with aspect ratio of 64 and 80 are a little better than those of SFRC with aspect ratio of 67. For each SFRC mixture used in the study, the residual flexural tensile strength ratio defined in Model Code 2010 was more than the limit value to be able to substitute rebar or welded mesh in structural members with the fiber reinforcement.

• Journal of Mushroom
• /
• v.20 no.1
• /
• pp.29-33
• /
• 2022

In this study, five different Lentinula edodes cultivar (Chamaram, Sanbaekhyang, Sanjo 713ho, Sanjo 715ho, Sanjo 718ho) were evaluated for their ability to decolorize Remazol Brilliant Blue R (RBBR) in MEB medium, respectively. Chamaram and Sanjo 713ho decolorized RBBR rapidly in MEB medium within 3 and 5 days. The activities of manganese peroxidase (MnP) and laccase were determined on the MEB medium with and without lignin. Sanjo 713ho resulted the highest ligninolytic enzyme activities on incubation day 1, indicating of 1,213 U/mg of MnP activity and 1,421 U/mg of laccase activity.