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Daeyoung Lim
Human Convergence Technology R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Korea

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Journal article
Published: 13 July 2021 in Processes
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This study aimed to establish an automatic sewing process for garment production according to textile properties. An automatic feeding system and a self-made template were introduced to an industrial sewing machine. Two types of stitches were performed on fabrics with various physical properties and surface roughness using this automatic sewing machine. The appearance, stitch length and width, seam strength, and seam efficiency were evaluated according to the sewing conditions, such as presser height and sewing speed. In addition, the correlation between textile properties, sewing conditions, and sewability was analyzed to derive a regression equation for sewability. The evaluation showed no difference in the lock stitch condition. On the other hand, under the zigzag stitch condition, the stitch width differed according to the presser height, which also affected the seam structure. The optimal presser height for each fabric was derived from the experimental results. In terms of the sewing speed, however, the seam strength was the best at 200 RPM in the lock stitch and 400 RPM in the zigzag stitch. The moderating effect of the presser height between textile properties and sewability in the lock stitch condition was confirmed. This result can be used as basic data for establishing an automatic sewing process for smart factories.

ACS Style

Suhyun Lee; Soohyeon Rho; Daeyoung Lim; Wonyoung Jeong. A Basic Study on Establishing the Automatic Sewing Process According to Textile Properties. Processes 2021, 9, 1206 .

AMA Style

Suhyun Lee, Soohyeon Rho, Daeyoung Lim, Wonyoung Jeong. A Basic Study on Establishing the Automatic Sewing Process According to Textile Properties. Processes. 2021; 9 (7):1206.

Chicago/Turabian Style

Suhyun Lee; Soohyeon Rho; Daeyoung Lim; Wonyoung Jeong. 2021. "A Basic Study on Establishing the Automatic Sewing Process According to Textile Properties." Processes 9, no. 7: 1206.

Article
Published: 20 May 2021 in Fibers and Polymers
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Polymer foam, a core material in the foam-cored carbon fiber reinforced polymer (CFRP) sandwich composites, is a low-strength material with porous characteristics and mechanical properties different from those of CFRP. Consequently, the accurate measurement of the material properties, such as the interfacial bonding force between the foam and CFRP of the foam-cored CFRP sandwich composite is difficult. This is because the foam becomes compressed and deformed if fixed by applying pressure, as in the case of the regular method. To mitigate this shortcoming, this study developed a novel test fixture for the measurement of the interfacial bonding force of foam-cored sandwich composites. Furthermore, a forming fixture was devised to uniformly fabricate samples used in the developed test fixture. Using the developed fixture of interfacial bonding force for foam-cored sandwich composites, the interfacial bonding force of CFRP sandwich composites was measured with respect to polymethacrylimide (PMI) foam (thermosetting polymer) and polyethylene terephthalate (PET) foam (thermoplastic polymer). The measured interfacial bonding strength between the PET foam and the CFRP was larger than the tensile strength of the PET foam. In contrast, the interfacial bonding force of PMI foam and CFRP was at the level 20% of the tensile strength of the PMI foam. The microstructures were analyzed using an optical microscope and scanning electron microscope to investigate the cause. According to the results, the bonding area between the PMI foam and the CRFP resin was relatively small compared to that between the PET foam and the CFRP resin. The interfacial bonding force of foam-cored sandwich composites can be measured more accurately using the measurement fixture of the interfacial bonding force and the forming fixture developed in this study.

ACS Style

Jae-Chul Lee; Seongil Yu; Hyun-Seok Jung; Ki-Young Kim; Dae Young Lim. Measurement of Interfacial Bonding Force between Foam and CFRP in Foam-Cored CFRP Sandwich Composites. Fibers and Polymers 2021, 22, 1934 -1939.

AMA Style

Jae-Chul Lee, Seongil Yu, Hyun-Seok Jung, Ki-Young Kim, Dae Young Lim. Measurement of Interfacial Bonding Force between Foam and CFRP in Foam-Cored CFRP Sandwich Composites. Fibers and Polymers. 2021; 22 (7):1934-1939.

Chicago/Turabian Style

Jae-Chul Lee; Seongil Yu; Hyun-Seok Jung; Ki-Young Kim; Dae Young Lim. 2021. "Measurement of Interfacial Bonding Force between Foam and CFRP in Foam-Cored CFRP Sandwich Composites." Fibers and Polymers 22, no. 7: 1934-1939.

Journal article
Published: 02 March 2021 in Sustainability
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According to recent trends, smart clothing products that can receive electromyography (EMG) signals during the wearer’s muscle activity are being developed and commercialized. On the other hand, there is a lack of knowledge on the way to specify the electrode locations on the clothing pattern. Accurately located EMG electrodes in the clothing support the reliability and usefulness of the products. Moreover, a systematic process to construct anatomically validated smart clothing digitally should be performed to facilitate the application of a mass-customized manufacturing system. The current study explored the EMG measurement locations of nine muscles and analyzed them in association with various anthropometric points and even postures based on the 3D body scan data. The results suggest that several line segments of the patterns can be substituted by size-dependent equations for the electrodes in place. As a final step, a customized pattern of a smart EMG suit was developed virtually. The current study proposes a methodology to develop body-size dependent equations and patterns of a smart EMG suit with well-located electrodes using 3D scan data. These results suggest ways to produce smart EMG suits in response to impending automation and mass customization of the clothing manufacturing system.

ACS Style

Sojung Lee; Siyeon Kim; Daeyoung Lim; Dong-Eun Kim; Wonyoung Jeong. Analysis of EMG Electrode Locations Using 3D Body Scanning for Digital Pattern Construction of a Smart EMG Suit. Sustainability 2021, 13, 2654 .

AMA Style

Sojung Lee, Siyeon Kim, Daeyoung Lim, Dong-Eun Kim, Wonyoung Jeong. Analysis of EMG Electrode Locations Using 3D Body Scanning for Digital Pattern Construction of a Smart EMG Suit. Sustainability. 2021; 13 (5):2654.

Chicago/Turabian Style

Sojung Lee; Siyeon Kim; Daeyoung Lim; Dong-Eun Kim; Wonyoung Jeong. 2021. "Analysis of EMG Electrode Locations Using 3D Body Scanning for Digital Pattern Construction of a Smart EMG Suit." Sustainability 13, no. 5: 2654.

Journal article
Published: 02 February 2021 in Processes
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The garment manufacturing industry is a labor-intensive industry, with one of the slowest transitions to automation. Hence, it is essential to build a smart factory based on automated systems to improve productivity and allow responsive production in the market. In this study, the manufacturing processes for a smart sports bra were established and optimized using various automated machines. For this system, computer-based 3D virtual design software, a technical embroidery machine, an automatic cutting machine, an industrial robot arm with gripper, and an industrial pattern sewing machine were used. The design and materials of the sports bra were selected considering embroidery, cutting, robot gripping, and sewing processes. In addition, conductive thread and light-emitting diode (LED) sequences were used to implement smart functions to the sports bra. Transport of intermediate materials, work orders, and process conditions were optimized to improve the flexible connection of each process and the quality of the final product. This study suggests the concept of the automated manufacturing system that minimizes human intervention by connecting the processes needed to produce a smart sports bra using various automation equipment and programs already used in the industry.

ACS Style

Suhyun Lee; Soo Rho; Sojung Lee; Jiwoong Lee; Sang Lee; Daeyoung Lim; Wonyoung Jeong. Implementation of an Automated Manufacturing Process for Smart Clothing: The Case Study of a Smart Sports Bra. Processes 2021, 9, 289 .

AMA Style

Suhyun Lee, Soo Rho, Sojung Lee, Jiwoong Lee, Sang Lee, Daeyoung Lim, Wonyoung Jeong. Implementation of an Automated Manufacturing Process for Smart Clothing: The Case Study of a Smart Sports Bra. Processes. 2021; 9 (2):289.

Chicago/Turabian Style

Suhyun Lee; Soo Rho; Sojung Lee; Jiwoong Lee; Sang Lee; Daeyoung Lim; Wonyoung Jeong. 2021. "Implementation of an Automated Manufacturing Process for Smart Clothing: The Case Study of a Smart Sports Bra." Processes 9, no. 2: 289.

Journal article
Published: 22 October 2020 in Polymers
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To produce flame retardant poly(acrylonitrile-co-vinylidene chloride) (PANVDC) fibers with limiting oxygen index (LOI) values above 28%, flame retardants are added to fibers. Because antimony trioxide (ATO) used widely for PANVDC is suspected as a carcinogen, non-toxic zinc hydroxystannate (ZHS) could be the alternative for reduction of ATO usage. Moreover, a flame retardant efficiency of the combination of ATO with ZHS could be expected because it was reported that ATO resists flame in the gas phase, whereas ZHS reacts in the condensed phase. Therefore, this study discussed the flame retardant mechanisms of ATO and ZHS in PANVDC, and evaluated the efficiency of the combination. PANVDC fibers with ATO and ZHS in 15 phr were produced by wet spinning. When ZHS was added, a more cyclized structure was detected (e.g., 1-methylnaphthalene) through pyrolysis−gas chromatography-mass spectrometry (Py-GC/MS). As a result of SEM-EDX analysis, Sb and Cl hardly remained in char layers of PANVDC-ATO; meanwhile, Zn, Sn, and Cl remained in that of PANVDC-ZHS. This implied that SbCl3 from reaction of ATO and HCl reacts in the gas phase, whereas ZnCl2 and SnCl2 from ZHS and HCl promotes the cyclization reaction of PANVDC in the condensed phase. The LOI values of PANVDC, PANVDC-ATO, and PANVDC-ZHS were 26.4%, 29.0%, and 33.5%, respectively. This suggests that ZHS is a highly effective for PANVDC. Meanwhile, the LOI of PANVDC containing ATO-ZHS mixture is 31.0%. The combination of ATO and ZHS exhibited no efficiency. The addition of ATO and ZHS slightly reduced the tenacities of the fibers, respectively, 3.11 and 3.75 from 4.42 g/den.

ACS Style

Ji Su Kim; Ji Eun Song; Daeyoung Lim; Heejoon Ahn; Wonyoung Jeong. Flame-Retardant Mechanism and Mechanical Properties of Wet-Spun Poly(acrylonitrile-co-vinylidene chloride) Fibers with Antimony Trioxide and Zinc Hydroxystannate. Polymers 2020, 12, 2442 .

AMA Style

Ji Su Kim, Ji Eun Song, Daeyoung Lim, Heejoon Ahn, Wonyoung Jeong. Flame-Retardant Mechanism and Mechanical Properties of Wet-Spun Poly(acrylonitrile-co-vinylidene chloride) Fibers with Antimony Trioxide and Zinc Hydroxystannate. Polymers. 2020; 12 (11):2442.

Chicago/Turabian Style

Ji Su Kim; Ji Eun Song; Daeyoung Lim; Heejoon Ahn; Wonyoung Jeong. 2020. "Flame-Retardant Mechanism and Mechanical Properties of Wet-Spun Poly(acrylonitrile-co-vinylidene chloride) Fibers with Antimony Trioxide and Zinc Hydroxystannate." Polymers 12, no. 11: 2442.

Journal article
Published: 17 June 2020 in Polymers
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In this study, zinc hydroxystannate ([ZnSn(OH)6], ZHS) was coated with aluminum phosphate (AlPO4, ALP) to prepare the ZHS-ALP composite. During the coating process, the reaction conditions, such as the ALP to ZHS molar ratio, were controlled, and the morphology of the products was characterized by scanning electron microscopy (SEM). The prepared composites were introduced into poly(acrylonitrile-co-vinylidene chloride) (PANVDC), and the change in compatibility between ZHS and the polymer matrix was characterized. The results showed that ALP-ZHS (1:1), which was prepared by ALP-ZHS composite molar ratio of 1:1, could improve the dispersion and compatibility of ZHS in the polymer matrix and decrease the hydrophilicity and viscosity. Moreover, the ALP-ZHS composite had a better flame-retardant effect on PANVDC than ZHS alone. PANVDC could pass the V-0 rating in UL94, particularly the highest limiting oxygen index (LOI) value of 33.2% obtained when the ALP-ZHS (1:1) composite was added to PANVDC.

ACS Style

Ji Eun Song; Ji Su Kim; Daeyoung Lim; Wonyoung Jeong. Preparation and Characterization of Zinc Hydroxystannate Coated by Aluminum Phosphate and Its Application in Poly(acrylonitrile-co-vinylidene chloride). Polymers 2020, 12, 1365 .

AMA Style

Ji Eun Song, Ji Su Kim, Daeyoung Lim, Wonyoung Jeong. Preparation and Characterization of Zinc Hydroxystannate Coated by Aluminum Phosphate and Its Application in Poly(acrylonitrile-co-vinylidene chloride). Polymers. 2020; 12 (6):1365.

Chicago/Turabian Style

Ji Eun Song; Ji Su Kim; Daeyoung Lim; Wonyoung Jeong. 2020. "Preparation and Characterization of Zinc Hydroxystannate Coated by Aluminum Phosphate and Its Application in Poly(acrylonitrile-co-vinylidene chloride)." Polymers 12, no. 6: 1365.

Article
Published: 30 January 2020 in Fibers and Polymers
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In general, foam cored sandwich composites, wherein a polymer foam for structural materials is disposed at the center and a heterogeneous material such as CFRP or GFRP is bonded to one or both sides of the polymer foam, are excellent with regard to their volume-to-weight and vibration damping characteristics. For this reason, foam cored sandwich composites are mainly used in the transportation field and has applications across various fields. This study aims to apply a foam cored CFRP sandwich composite to an automotive rear spoiler. To reduce the weight compared to conventional rear spoiler with ABS/PC, we did the lamination design of the carbon weave of the foam cored CFRP sandwich composite. Then, the PMI foam cored CFRP sandwich composite spoiler was compared with the conventional ABS/PC spoiler and CFRP spoiler for mechanical behavior through finite element analysis. The results demonstrated that our PMI foam cored CFRP sandwich composite spoiler was 7.81 times more secure and 43.6 % lighter than the ABS/PC spoiler.

ACS Style

Jae-Chul Lee; Do-Hyung Park; Hyun-Seok Jung; Seung Hynu Lee; Won Young Jeong; Ki-Young Kim; Dae Young Lim. Design for Carbon Fiber Lamination of PMI Foam Cored CFRP Sandwich Composite Applied to Automotive Rear Spoiler. Fibers and Polymers 2020, 21, 156 -161.

AMA Style

Jae-Chul Lee, Do-Hyung Park, Hyun-Seok Jung, Seung Hynu Lee, Won Young Jeong, Ki-Young Kim, Dae Young Lim. Design for Carbon Fiber Lamination of PMI Foam Cored CFRP Sandwich Composite Applied to Automotive Rear Spoiler. Fibers and Polymers. 2020; 21 (1):156-161.

Chicago/Turabian Style

Jae-Chul Lee; Do-Hyung Park; Hyun-Seok Jung; Seung Hynu Lee; Won Young Jeong; Ki-Young Kim; Dae Young Lim. 2020. "Design for Carbon Fiber Lamination of PMI Foam Cored CFRP Sandwich Composite Applied to Automotive Rear Spoiler." Fibers and Polymers 21, no. 1: 156-161.

Journal article
Published: 30 September 2019 in Polymers
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In this study, carbon nanotubes (CNTs) were introduced into carbon fiber (CF) wet-laid composites as functional nano-fillers to fabricate multi-functional composites with improved mechanical, electrical, and thermal properties. It was considered that the wet-laid process was most suitable in order to introduce filler into brittle and rigid carbon fiber substrates, and we established the conditions of the process that could impart dispersibility and bonding between the fibers. We introduced polyamide 6 (PA6) short fiber, which is the same polymeric material as the stacking film, into carbon fiber and CNT mixture to enhance the binding interactions between carbon fiber and CNTs. Various types of CNT-reinforced carbon fiber wet-laid composites with PA6 short fibers were prepared, and the morphology, mechanical and electrical properties of the composites were estimated. As CNT was added to the carbon fiber nonwoven, the electrical conductivity increased by 500% but the tensile strength decreased slightly. By introducing short fibers of the same material as the matrix between CNT-CF wet-laid nonwovens, it was possible to find optimum conditions to increase the electrical conductivity while maintaining mechanical properties.

ACS Style

Suhyun Lee; Kwangduk Ko; Jiho Youk; Daeyoung Lim; Wonyoung Jeong. Preparation and Properties of Carbon Fiber/Carbon Nanotube Wet-Laid Composites. Polymers 2019, 11, 1597 .

AMA Style

Suhyun Lee, Kwangduk Ko, Jiho Youk, Daeyoung Lim, Wonyoung Jeong. Preparation and Properties of Carbon Fiber/Carbon Nanotube Wet-Laid Composites. Polymers. 2019; 11 (10):1597.

Chicago/Turabian Style

Suhyun Lee; Kwangduk Ko; Jiho Youk; Daeyoung Lim; Wonyoung Jeong. 2019. "Preparation and Properties of Carbon Fiber/Carbon Nanotube Wet-Laid Composites." Polymers 11, no. 10: 1597.

Review
Published: 23 April 2010 in Energies
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This paper describes the fabrication of novel modified polyethylene (PE) membranes using plasma technology to create high-performance and cost-effective separator membranes for practical applications in lithium-ion polymer batteries. The modified PE membrane via plasma modification process plays a critical role in improving wettability and electrolyte retention, interfacial adhesion between separators and electrodes, and cycle performance of lithium-ion polymer batteries. This paper suggests that the performance of lithium-ion polymer batteries can be greatly enhanced by the plasma modification of commercial separators with proper functional materials for targeted application.

ACS Style

Jun Young Kim; Dae Young Lim. Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery. Energies 2010, 3, 866 -885.

AMA Style

Jun Young Kim, Dae Young Lim. Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery. Energies. 2010; 3 (4):866-885.

Chicago/Turabian Style

Jun Young Kim; Dae Young Lim. 2010. "Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery." Energies 3, no. 4: 866-885.

Journal article
Published: 30 May 2009 in Electrochimica Acta
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The surface of polyethylene (PE) membranes as a separator for lithium-ion polymer battery was modified with acrylonitrile (AN) using the plasma technology. The plasma-induced acrylonitrile coated PE (PiAN-PE) membrane was characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and contact angle measurement. The electrochemical performance of the lithium-ion polymer cell fabricated with the PE and the PiAN-PE membranes were also analyzed. The surface characterization demonstrates that the enhanced adhesion of the PiAN-PE membrane resulted from the increased polar component of surface energy for the PiAN-PE membrane. The presence of the PiAN induced onto the surface of the membrane via the plasma modification plays a critical role in improving the wettability and electrolyte retention, the interfacial adhesion between the electrodes and the separator, the cycle performance of the resulting lithium-ion polymer cell assembly. The PiAN-PE membrane modified by the plasma treatment holds a great potential to be used as a high-performance and cost-effective separator for lithium-ion polymer battery.

ACS Style

Jun Young Kim; Yongbeom Lee; Dae Young Lim. Plasma-modified polyethylene membrane as a separator for lithium-ion polymer battery. Electrochimica Acta 2009, 54, 3714 -3719.

AMA Style

Jun Young Kim, Yongbeom Lee, Dae Young Lim. Plasma-modified polyethylene membrane as a separator for lithium-ion polymer battery. Electrochimica Acta. 2009; 54 (14):3714-3719.

Chicago/Turabian Style

Jun Young Kim; Yongbeom Lee; Dae Young Lim. 2009. "Plasma-modified polyethylene membrane as a separator for lithium-ion polymer battery." Electrochimica Acta 54, no. 14: 3714-3719.