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Article: Effect of Processing Parameters on Bonding Performance of a Carbon Fiber/Polyetheretherketone Thermoplastic Composite Prepared by Induction Welding.

Choi, Bo-Kyung / Kang, Chang-Soo / Yoo, Myeong-Han / Seo, Min-Kang

2023 Volume 16, Issue 11

Abstract: Among the various welding techniques used to bond thermoplastic composites, induction welding stands out as a fast, clean, and contact-free process that shortens the welding time and prevents the weight increase of mechanical fastening, such as rivets ... ...

Abstract	Among the various welding techniques used to bond thermoplastic composites, induction welding stands out as a fast, clean, and contact-free process that shortens the welding time and prevents the weight increase of mechanical fastening, such as rivets and bolts. In this study, we manufactured polyetheretherketone (PEEK)-resin-based thermoplastic carbon fiber (CF) composite materials at different automated fiber placement laser powers (3569, 4576, and 5034 W) and investigated their bonding and mechanical characteristics after induction welding. The quality of the composite was evaluating using various techniques, including optical microscopy, C-scanning, and mechanical strength measurements, and a thermal imaging camera was used to monitor the surface temperature of the specimen during its processing. The results revealed that the preparation conditions of the polymer/carbon fiber composites, such as the laser power and surface temperature, significantly affect the quality and performance of the induction-welding-bonded composites. A lower laser power during preparation resulted in weaker bonding between components of the composite and yielded samples with a lower shear stress.
Language	English
Publishing date	2023-05-25
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma16113954
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Manufacturing of Carbon Fibers/Polyphenylene Sulfide Composites via Induction-Heating Molding: Morphology, Mechanical Properties, and Flammability.

Kang, Chang-Soo / Shin, Hyun-Kyu / Chung, Yong-Sik / Seo, Min-Kang / Choi, Bo-Kyung

Polymers

2022 Volume 14, Issue 21

Abstract: Conventional thermosetting composites exhibit advantageous mechanical properties owing to the use of an autoclave; however, their wide usage is limited by high production costs and long molding times. In contrast, the fabrication of thermoplastic ... ...

Abstract	Conventional thermosetting composites exhibit advantageous mechanical properties owing to the use of an autoclave; however, their wide usage is limited by high production costs and long molding times. In contrast, the fabrication of thermoplastic composites involves out-of-autoclave processes that use press equipment. In particular, induction-heating molding facilitates a quicker thermal cycle, reduced processing time, and improved durability of the thermoplastic polymers; thus, the process cost and production time can be reduced. In this study, carbon fiber/polyphenylene sulfide thermoplastic composites were manufactured using induction-heating molding, and the relationships among the process, structure, and mechanical properties were investigated. The composites were characterized using optical and scanning electron microscopy, an ultrasonic C-scan, and X-ray computed tomography. In addition, the composites were subjected to flammability tests. This study provides novel insights into the optimization of thermoplastic composite manufacturing and thermoset composite curing processes.
Language	English
Publishing date	2022-10-28
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym14214587
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Article ; Online: Author Correction: Optimal view detection for ultrasound-guided supraclavicular block using deep learning approaches.

Jo, Yumin / Lee, Dongheon / Baek, Donghyeon / Choi, Bo Kyung / Aryal, Nisan / Jung, Jinsik / Shin, Yong Sup / Hong, Boohwi

Scientific reports

2023 Volume 13, Issue 1, Page(s) 19648

Language	English
Publishing date	2023-11-10
Publishing country	England
Document type	Published Erratum
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-46973-5
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Article ; Online: Optimal view detection for ultrasound-guided supraclavicular block using deep learning approaches.

Jo, Yumin / Lee, Dongheon / Baek, Donghyeon / Choi, Bo Kyung / Aryal, Nisan / Jung, Jinsik / Shin, Yong Sup / Hong, Boohwi

Scientific reports

2023 Volume 13, Issue 1, Page(s) 17209

Abstract: Successful ultrasound-guided supraclavicular block (SCB) requires the understanding of sonoanatomy and identification of the optimal view. Segmentation using a convolutional neural network (CNN) is limited in clearly determining the optimal view. The ... ...

Abstract	Successful ultrasound-guided supraclavicular block (SCB) requires the understanding of sonoanatomy and identification of the optimal view. Segmentation using a convolutional neural network (CNN) is limited in clearly determining the optimal view. The present study describes the development of a computer-aided diagnosis (CADx) system using a CNN that can determine the optimal view for complete SCB in real time. The aim of this study was the development of computer-aided diagnosis system that aid non-expert to determine the optimal view for complete supraclavicular block in real time. Ultrasound videos were retrospectively collected from 881 patients to develop the CADx system (600 to the training and validation set and 281 to the test set). The CADx system included classification and segmentation approaches, with Residual neural network (ResNet) and U-Net, respectively, applied as backbone networks. In the classification approach, an ablation study was performed to determine the optimal architecture and improve the performance of the model. In the segmentation approach, a cascade structure, in which U-Net is connected to ResNet, was implemented. The performance of the two approaches was evaluated based on a confusion matrix. Using the classification approach, ResNet34 and gated recurrent units with augmentation showed the highest performance, with average accuracy 0.901, precision 0.613, recall 0.757, f1-score 0.677 and AUROC 0.936. Using the segmentation approach, U-Net combined with ResNet34 and augmentation showed poorer performance than the classification approach. The CADx system described in this study showed high performance in determining the optimal view for SCB. This system could be expanded to include many anatomical regions and may have potential to aid clinicians in real-time settings.Trial registration The protocol was registered with the Clinical Trial Registry of Korea (KCT0005822, https://cris.nih.go.kr ).
MeSH term(s)	Humans ; Deep Learning ; Retrospective Studies ; Neural Networks, Computer ; Diagnosis, Computer-Assisted ; Ultrasonography, Interventional ; Image Processing, Computer-Assisted/methods
Language	English
Publishing date	2023-10-11
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-44170-y
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Article ; Online: Hydrothermal Preparation of Ag/TiO₂/GO Nanocomposites with Ammonia-Treated Graphene Oxide for Enhanced Conductivity.

Choi, Bo-Kyung / Choi, Woong-Ki / Park, Jong-Hyun / Park, Soo-Jin / Seo, Min-Kang

Journal of nanoscience and nanotechnology

2020 Volume 20, Issue 11, Page(s) 6698–6702

Abstract: In this study, Ag/TiO₂/GO nanocomposites were successfully fabricated by a facile hydrothermal method. Nitrogen-doped GO was prepared using ammonia treatment to improve its conductivity. The Ag/TiO₂/GO nanocomposites were characterized by scanning ... ...

Abstract	In this study, Ag/TiO₂/GO nanocomposites were successfully fabricated by a facile hydrothermal method. Nitrogen-doped GO was prepared using ammonia treatment to improve its conductivity. The Ag/TiO₂/GO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), zeta potential, and photoluminescence spectroscopy (PL). A homogeneous dispersion of Ag/TiO₂ nanoparticles was shown on the surface of GO. Increasing the nitrogen doping concentration increased hydrophilicity, thereby improving the conductivity of Ag/TiO₂/GO nanocomposites.
Language	English
Publishing date	2020-06-30
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1533-4899
ISSN (online)	1533-4899
DOI	10.1166/jnn.2020.18802
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Article: One-Pot Synthesis of Ag-TiO₂/Nitrogen-Doped Graphene Oxide Nanocomposites and Its Photocatalytic Degradation of Methylene Blue.

Choi, Bo-Kyung / Choi, Woong-Ki / Park, Soo-Jin / Seo, Min-Kang

Journal of nanoscience and nanotechnology

2018 Volume 18, Issue 9, Page(s) 6075–6080

Abstract: In this study, we report Ag-TiO2/graphene oxide (GO) nanocomposites prepared by a simple one-pot synthesis using TiO2, AgNO3, and N-doped graphene (NDG). The NDG was synthesized using a microwave-assisted hydrothermal (MHT) method as a function of MHT ... ...

Abstract	In this study, we report Ag-TiO2/graphene oxide (GO) nanocomposites prepared by a simple one-pot synthesis using TiO2, AgNO3, and N-doped graphene (NDG). The NDG was synthesized using a microwave-assisted hydrothermal (MHT) method as a function of MHT time. The morphology and structure of Ag-TiO2/GO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman, and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic activity of Ag-TiO2/GO nanocomposites in visible light was explored using the degradation, of methylene blue (MB) dye under the ultraviolet (UV) light. The result showed that Ag-TiO2/GO-3 was very efficient for the degradation of MB with nitrogen doping time. The degradation efficiency of the photocatalytic nanoparticles after 6 h of irradiation was about 80%. Increasing the N-doping time increased their hydrophilicity, thereby improving the photocatalytic performance of Ag-TiO2/GO nanocomposites.
Language	English
Publishing date	2018-02-14
Publishing country	United States
Document type	Journal Article
ISSN	1533-4880
ISSN	1533-4880
DOI	10.1166/jnn.2018.15616
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Article: Comparative seed morphology of Boronia and related genera (Boroniinae: Rutaceae) and its systematic implications

Choi, Bo‐Kyung / Duretto, Marco F / Hong, Suk‐Pyo

Nordic journal of botany. 2012 Apr., v. 30, no. 2

2012

Abstract: Comparative seed morphology of Boronia Sm., Boronella Baill., Neobyrnesia J. A. Armstr. and Zieria Sm., 31 taxa in total, in Rutaceae is studied. The seeds are ventrally ellipsoid to ovoid (0.93–4.42 × 0.50–2.31 × 0.95–2.70 mm). Colour is brown to black. ...

Abstract	Comparative seed morphology of Boronia Sm., Boronella Baill., Neobyrnesia J. A. Armstr. and Zieria Sm., 31 taxa in total, in Rutaceae is studied. The seeds are ventrally ellipsoid to ovoid (0.93–4.42 × 0.50–2.31 × 0.95–2.70 mm). Colour is brown to black. An elaiosome which is related to myrmechocory was observed in Boronella, Boronia, Neobyrnesia and Zieria. Six testa surface pattern types are identified: Type I (Boronia sect. Boronia) – smooth, and cells not barely discernable; Type II (Boronella) – smooth and cells more or less rectangular and often cells elongated; Type III (Boronia sects. Boronia, Cyanothamnus, Imbricatae and Valvatae, Neobyrnesia) – colliculate with four subtypes by presence, absence of ridges or ridge characters; Type IV (Boronia sect. Alatae) – digit form; Type V (Boronia sect. Algidae) – alveolate; Type VI (Zieria) – ridged, the interridge area formed by both cells that form the ridges and cells that do not form the ridges. Seed morphology, especially testa surface patterns, was partially congruent with the current classification of Boronia, with most sections having apomorphies, and provided additional support for the placement of Boronella near Boronia sect. Boronia. Hilum (surrounded by labiose margin or not) and elaiosome shape also offer useful diagnostic characters for Boronia at infrageneric levels. Neobyrnesia and Zieria both had unique testa surface patterns. The seed morphological data contribute to our understanding of systematic relationship in the subtribe Boroniinae.
Keywords	Boronia ; Zieria ; color ; seeds ; testa
Language	English
Dates of publication	2012-04
Size	p. 241-256.
Publishing place	Blackwell Publishing Ltd
Document type	Article
ZDB-ID	2406507-9
ISSN	1756-1051 ; 0107-055X
ISSN (online)	1756-1051
ISSN	0107-055X
DOI	10.1111/j.1756-1051.2011.01251.x
Database	NAL-Catalogue (AGRICOLA)

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Article: Development of Analytical Method and Monitoring of Veterinary Drug Residues in Korean Animal Products.

Song, Jae-Sang / Park, Su-Jeong / Choi, Jung-Yun / Kim, Jin-Sook / Kang, Myung-Hee / Choi, Bo-Kyung / Hur, Sun Jin

Korean journal for food science of animal resources

2016 Volume 36, Issue 3, Page(s) 319–325

Abstract: This study was conducted to determine the residual amount of veterinary drugs such as meloxicam, flunixin, and tulathromycin in animal products (beef, pork, horsemeat, and milk). Veterinary drugs have been widely used in the rearing of livestock to ... ...

Abstract	This study was conducted to determine the residual amount of veterinary drugs such as meloxicam, flunixin, and tulathromycin in animal products (beef, pork, horsemeat, and milk). Veterinary drugs have been widely used in the rearing of livestock to prevent and treat diseases. A total of 152 samples were purchased from markets located in major Korean cities (Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Ulsan and Jeju), including Jeju. Veterinary drugs were analyzed by liquid chromatography-tandem mass spectrometry according to the Korean Food Standards Code. The resulting data, which are located within 70-120% of recovery range and less than 20% of relative standard deviations, are in compliance with the criteria of CODEX. A total of five veterinary drugs were detected in 152 samples, giving a detection rate of approximately 3.3%; and no food source violated the guideline values. Our result indicated that most of the veterinary drug residues in animal products were below the maximum residue limits specified in Korea.
Language	English
Publishing date	2016-06-30
Publishing country	Korea (South)
Document type	Journal Article
ZDB-ID	2576747-1
ISSN	2234-246X ; 1225-8563 ; 1225-8563
ISSN (online)	2234-246X ; 1225-8563
ISSN	1225-8563
DOI	10.5851/kosfa.2016.36.3.319
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Article ; Online: Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic-aerobic MBRs.

Lee, Jung-Yeol / Choi, Bo-Kyung / Ahn, Kyu-Hong / Maeng, Sung Kyu / Song, Kyung-Guen

Bioprocess and biosystems engineering

2012 Volume 35, Issue 8, Page(s) 1389–1398

Abstract: Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional batch ... ...

Abstract	Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional batch filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m(2)/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.
MeSH term(s)	Bioreactors ; Filtration/instrumentation ; Filtration/methods ; Gels ; Membranes, Artificial
Chemical Substances	Gels ; Membranes, Artificial
Language	English
Publishing date	2012-10
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1476357-6
ISSN	1615-7605 ; 1432-0797 ; 1615-7591
ISSN (online)	1615-7605 ; 1432-0797
ISSN	1615-7591
DOI	10.1007/s00449-012-0727-z
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Article: Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic–aerobic MBRs

Lee, Jung-Yeol / Choi, Bo-Kyung / Ahn, Kyu-Hong / Maeng, Sung Kyu / Song, Kyung-Guen

Bioprocess and biosystems engineering. 2012 Oct., v. 35, no. 8

2012

Abstract	Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional batch filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m2/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.
Keywords	aerobic conditions ; anaerobic conditions ; bioprocessing ; bioreactors ; filters ; filtration ; fouling ; gels ; nitrogen ; nonwoven fabrics ; polyethylene ; polypropylenes ; pressure ; sludge ; suspensions
Language	English
Dates of publication	2012-10
Size	p. 1389-1398.
Publishing place	Springer-Verlag
Document type	Article
ZDB-ID	1476357-6
ISSN	1432-0797 ; 1615-7605 ; 1615-7591
ISSN (online)	1432-0797 ; 1615-7605
ISSN	1615-7591
DOI	10.1007/s00449-012-0727-z
Database	NAL-Catalogue (AGRICOLA)

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