• Title/Summary/Keyword: Finishing Process

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Prediction of Carbonation Progress Using Diffusion Coefficient of $CO_2$ in the Atmosphere ($CO_2$ 산계수를 이용한 일반 대기환경에서의 중성화진행예측)

  • Kang, Suk-Pyo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.1
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    • pp.141-147
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    • 2010
  • The rate of carbonation is usually low in the natural environment due to the low $CO_2$ concentration in the atmosphere. Therefore, investigation of carbonation is usually conducted under accelerated testing conditions so as to speed up the process. This study is to predict carbonation progress by mathematical model, based on the diffusions of $CO_2$ and its reaction with $Ca(OH)_2$ in carbonation progressing region, in the atmosphere. To predict of carbonation progress in the atmosphere, we adopted a diffusion coefficient of $CO_2$ that agreed well the experimental value obtained by the accelerated carbonation test. Consequently the model can predict the rate of carbonation of concrete exposed in the atmosphere regardless of finishing materials.

Analysis of Radon Reduction Effect Using Coffee Waste Mixture (커피 찌꺼기 혼합물을 활용한 라돈 저감 효과 분석)

  • Je, Jae-Yong;Kim, Gyeong-Min;Kim, Yul-Min;Lee, Hyun-Woo;Park, Ji-Woo
    • Journal of the Korean Society of Radiology
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    • v.15 no.6
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    • pp.855-860
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    • 2021
  • Coffee is a popular beverage not only in Korea but also around the world, and its consumption is on the rise. As coffee consumption increases, coffee waste are also increasing, and recycling is attempted in various fields. However, these recycling methods require complex recycling processes and specialized skills. However, in this study coffee waste, agar powder, and powdered glue were mixed in an appropriate ratio and used as a cement building finishing material. This recycling method has a simple manufacturing method and was shown to improve indoor air quality by delaying radon emitted from cement walls for 2.5 hours with one application and 3.9 hours with two applications. In addition, it was shown that after applying the coffee waste mixture, it was applied twice to close the cracks that occurred during the drying process, thereby prevent the coffee waste from falling off the wall for aesthetic perfection.

The study on the view of death in the Buddhism for well dying's culture formation (웰다잉(well dying) 문화 형성을 위한 불교의 죽음관 연구)

  • Yun, Young-ho
    • Journal of Korean Philosophical Society
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    • v.130
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    • pp.161-186
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    • 2014
  • Recently, the social concerns on well dying come to the fore as important discourse on dignity of human death, which detonation by the problem of euthanasia. Well dying means 'good death' the meaning of a word, and it means 'prepared death', 'decented death' 'beautiful death' by extention of sematic context like this as a general rule. In this paper the writter have considered that how the view of Buddhism's death contribute to the discourse on well dying, which regarding death as the starting point, death conquest as the finishing point of the theory. The Buddhism's discourse on the attitude interpretation conquest process of death contributed to formation of abundant discourse on well dying, especially the view of Buddhism is able to contribute to conquest of death anxiety and death education, that death conquest interpret to spiritual psychological phenomenon not physical physiological eternal life (or immortality) and conquer death through enlightenment on reality of things by spiritual psychological change.

Surface Characteristics, Antimicrobial and Photodegradation Effect of Cotton Fibers Coated with TiO2 Nanoparticles and 3-Mercaptopropyltrimethoxysilane(3-MPTMS) (TiO2 나노입자와 3-MPTMS로 코팅 처리한 면섬유의 표면 특성과 항균성 및 광분해효과)

  • Park, Sujin;Lee, Jaewoong;Kim, Sam Soo;Lee, Sang Oh
    • Textile Coloration and Finishing
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    • v.30 no.4
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    • pp.245-255
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    • 2018
  • In this study, cotton fabrics were coated with $TiO_2$ nanoparticles using 3-mercaptopropyltrimethoxysilane(3-MPTMS), which is highly reactive to cotton fabrics, as a medium, and the characteristics, antimicrobial properties, and photodegradation properties of the fibers were measured. The manufacturing process is as follows. (1) 3-MPTMS was added to isopropanol, and $TiO_2$ colloid was added to the mixture to prepare a solution. (2) Cellulose fibers were immersed in the prepared $3-MPTMS/TiO_2$ solution, stirred for 90 minutes at $45^{\circ}C$ in a constant temperature water bath, and dried thereafter. In order to identify the morphology of the cellulose fibers coated with $TiO_2$ nanoparticles, the surface was observed with a scanning electron microscope(SEM), and SEM-EDS was measured to identify the adhesion of $TiO_2$ nanoparticles. The SEM images showed $TiO_2$ nanoparticle and 3-MPTMS coated layers on the fibers and it was identified that $TiO_2$ nanoparticles were attached to the cellulose fibers. The antimicrobial activity of $3-MPTMS/TiO_2$-treated cotton fabrics was measured using a bacterial reduction method. $3-MPTMS/TiO_2$ cellulose fibers which was irradiated by ultra violet light, showed antimicrobial activity against Escherichia coli(ATCC 43895) and Staphylococcus aureus(ATCCBAA-1707) unlike unirradiated fibers. The cellulose fibers were stained with methylene blue and the photodegradation performance of the stained fabrics was analyzed. The stained fabrics showed high degradation performance with photolytic reactions of $TiO_2$ nanoparticles.

Study on the Mechanical Properties of Hybridized Carbon Fiber Composite According to Stacking Structure (하이브리드 탄소섬유 적층구조에 따른 복합재료의 기계적 특성 연구)

  • Koo, Seon Woong;Oh, Woo Jin;Won, Jong Sung;Lee, Ha Ram;Youn, Ju Young;Lee, Seung Goo
    • Textile Coloration and Finishing
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    • v.30 no.4
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    • pp.313-320
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    • 2018
  • As carbon fiber reinforced composites(CFRP) are widely used in aerospace, automobile, marine, and sports goods applications, they have been studied extensively by various researchers. However, CFRP have been pointed out because of machining problems such as delamination and burr phenomenons. Especially, hole machining process, drilling, has non-smooth features on inlet and outlet surfaces of drilled hole. This kind of machining problem can be controlled to some extent by using high modulus pitch-CF, which has considerable effects on fracture behavior of composite compared with only PAN CF composite. Therefore, PAN and pitch hybridized CF composites were prepared having high strength and modulus. The results demonstrate that the hybrid CFRP specimens with pitch CF offer the good potential to enhance modulus as well as strength properties. Dynamic mechanical, flexural, and impact properties were measured and analyzed. Morphological surface of the composites were also observed by IFS-28, canon after hole machining.

Optimum Design of a Wind Power Tower to Augment Performance of Vertical Axis Wind Turbine (수직축 풍력터빈 성능향상을 위한 풍력타워 최적설계에 관한 연구)

  • Cho, Soo-Yong;Rim, Chae Hwan;Cho, Chong-Hyun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.47 no.3
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    • pp.177-186
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    • 2019
  • Wind power tower has been used to augment the performance of VAWT (Vertical Axis Wind Turbine). However, inappropriately designed wind power tower could reduce the performance of VAWT. Hence, an optimization study was conducted on a wind power tower. Six design variables were selected, such as the outer radius and the inner radius of the guide wall, the adoption of the splitter, the inner radius of the splitter, the number of the guide wall and the circumferential angle. For the objective function, the periodic averaged torque obtained at the VAWT was selected. In the optimization, Design of Experiment (DOE), Genetic Algorithm (GA), and Artificial Neural Network (ANN) have been applied in order to avoid a localized optimized result. The ANN has been continuously improved after finishing the optimization process at each generation. The performance of the VAWT was improved more than twice when it operated within the optimized wind power tower compared to that obtained at a standalone.

Comparative Study of Mechanical and VOC Properties According to Manufacturing Conditions of Glass Fiber/Bamboo Fiber/PP Composites (유리섬유/대나무섬유/PP 복합재의 제조 조건에 따른 기계적 및 VOC 특성 비교 연구)

  • Lee, Su-kyoung;Park, Tae-sung;An, Seung-kook
    • Textile Coloration and Finishing
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    • v.33 no.3
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    • pp.153-160
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    • 2021
  • In this study, composite materials were prepared by varying the content of glass fiber and bamboo fiber in PP/glass fiber/bamboo fiber. Experiments were conducted to confirm the mechanical properties(tensile, impact and burst strength) and volatile organic compound content of the bamboo fiber composite prepared under these conditions. An improvement in the main properties was observed at a fiber content of 30wt%. When the fiber fraction was increased above 30wt%, the mechanical properties tended to decrease due to the agglomeration of fibers at higher load fractions. In addition, the content of volatile organic compounds increased as the content of bamboo fibers increased, which is thought to be due to the volatile organic compounds generated during the manufacturing process of the composite material being present in the composite material without escaping from the pores of the bamboo fibers and volatilizing at a certain temperature. As a result of confirming the physical properties of the composite, it is considered that the optimal mixing condition is 30wt% of bamboo fiber for the composite produced by varying the amount of bamboo fiber composite. In the future, it is thought that follow-up experiments to confirm and improve the pre-treatment conditions for reducing the content of volatile organic compounds in the manufactured composite material are possible.

Synthesis of Azo Based Disperse Dyes for Dyeing Polyester Fiber in Supercritical Carbon Dioxide (초임계 유체 염색용 아조계 분산염료 합성 및 PET 섬유에 대한 염색 특성 연구)

  • Shin, Seung-Rim;An, Kyoung-Lyong;Lee, Sunhye;Ko, Eunhee;Lee, In-Yeol;Kim, Changil;Jun, Kun
    • Textile Coloration and Finishing
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    • v.33 no.1
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    • pp.10-23
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    • 2021
  • In order to synthesize the dye suitable for supercritical carbon dioxide(ScCO2) dyeing, a series of azo based disperse dyes were prepared using various aniline derivatives as diazo components and indol derivatives as coupling components. Dyeing process in ScCO2 of the synthesized dyes was performed on PET fiber at 120℃ for 2 hrs under 250bar pressure with 0.5% o.w.f. of dye concentration. The absorption maxima varied from 400 to 580nm depending on the substituted groups in aniline derivatives and the indol derivatives. The dyes showed high molar extinction coefficients(ε) of 27,000~61,000M-1cm-1. Dyed PET fiber exhibited excellent brightness and good light, washing and perspiration(acid/alkali) fastness properties.

Effects of Chemical Composition of Ca(OH)2 and Precursors on the Properties of Fast-Curing Geopolymers (Ca(OH)2와 전구체의 화학 조성이 고속경화 지오폴리머의 물성에 미치는 영향)

  • Ko, Hyunseok;Noh, Jung Young;Lim, Hyung Mi
    • Korean Journal of Materials Research
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    • v.29 no.11
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    • pp.690-696
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    • 2019
  • Geopolymer is an alumina silicate-based ceramic material that has good heat-resistance and fire-resistance; it can be cured at room temperature, and thus its manufacturing process is simple. Geopolymer can be used as a reinforcement or floor finish for high-speed curing applications. In this manuscript, we investigate a high-speed curing geopolymer achieved by adding calcium to augment the curing rate. Metakaolin is used as the main raw material, and aqueous solutions of KOH and $K_2SiO_3$ are used as the activators. As a result of optimizing the high bending strength as a target factor for geopolymers with $SiO_2/Al_2O_3$ ratio of 4.1 ~ 4.8, the optimum ranges of the active agent are found to be $0.1{\leq}K_2O/SiO_2{\leq}0.4$ and $10{\leq}H_2O/K_2O{\leq}32.5$, and the optimum range of the curing accelerator is found to be $$0.82{\leq_-}Ca(OH)_2/Al_2O_3{\leq_-}2.87$$. The maximum flexural strength is found to be 1.35 MPa at $Ca(OH)_2/Al_2O_3=2.82$, $K_2O/SiO_2=0.3$, and $H_2O/K_2O=11.3$. The physical and thermal properties are analyzed to validate the applicability of these materials as industrial insulating parts or repairing finishing materials in construction.

A Study on the Effect of the Shape of the Exhaust Port on the Flow and Temperature Distribution in the Drying Part of the MRG(Mechanical Rubber Goods) Reinforcing Yarn Manufacturing System (MRG(Mechanical Rubber Goods) 보강사 제조시스템의 건조부에서의 배기구 형상이 유동 및 온도 분포에 미치는 영향에 관한 연구)

  • Kim, Hwan Kuk;Kwon, Hye In;Do, Kyu Hoi
    • Textile Coloration and Finishing
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    • v.34 no.2
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    • pp.109-116
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    • 2022
  • Tire codes are made of materials such as hemp, cotton, rayon, nylon, steel, polyester, glass, and aramid are fiber reinforcement materials that go inside rubber to increase durability, driveability, and stability of vehicle tires. The reinforcement of the tire cord may construct a composite material using tires such as automobiles, trucks, aircraft, bicycles, and fibrous materials such as electric belts and hoses as reinforcement materials. Therefore, it is essential to ensure that the adhesive force between the rubber and the reinforced fiber exhibits the desired physical properties in the rubber composite material made of a rubber matrix with reinforced fibers. This study is a study on the heat treatment conditions for improving the adhesion strength of the tire cord and the reinforced fiber for tires. The core technology of the drying process is a uniform drying technology, which has a great influence on the quality of the reinforcement. Therefore, the uniform airflow distribution is determined by the geometry and operating conditions of the dryer. Therefore, this study carried out a numerical analysis of the shape of a drying nozzle for improving the performance of hot air drying in a dryer used for drying the coated reinforced fibers. In addition, the flow characteristics were examined through numerical analysis of the study on the change in the shape of the chamber affecting drying.