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Dong Gyu Kim
Department of Mechanical and Shipbuilding Convergence Engineering, Pukyong National University, Busan 48547, Korea

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Journal article
Published: 25 December 2020 in New & Renewable Energy
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ACS Style

Changhee Lee; Donggyu Kim; Byeoungseok Yu; Booil Kim. Study on the Performance Evaluation of Smart Heating and Cooling Heat Pump System in a Balancing Well Cross-Conditioned Ground Heat Exchanger. New & Renewable Energy 2020, 16, 41 -48.

AMA Style

Changhee Lee, Donggyu Kim, Byeoungseok Yu, Booil Kim. Study on the Performance Evaluation of Smart Heating and Cooling Heat Pump System in a Balancing Well Cross-Conditioned Ground Heat Exchanger. New & Renewable Energy. 2020; 16 (4):41-48.

Chicago/Turabian Style

Changhee Lee; Donggyu Kim; Byeoungseok Yu; Booil Kim. 2020. "Study on the Performance Evaluation of Smart Heating and Cooling Heat Pump System in a Balancing Well Cross-Conditioned Ground Heat Exchanger." New & Renewable Energy 16, no. 4: 41-48.

Journal article
Published: 29 October 2020 in Applied Sciences
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Standing column well (SCW) geothermal heat exchanger permits a bleeding discharge of less than 20% in the event of a maximum load, which is an inappropriate method of using underground water. In this study, the existing operational method of two adjacent SCW geothermal heat exchangers, each with a single well, was modified. This technology aims to improve the coefficient of performance (COP) of the geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger. To curb the bleed water discharge, two balancing wells of cross-mixing methods were employed. The result of the cooling and heating operations with the existing SCW heat exchange system and the balancing well cross-combined heat exchange system showed that the measured COP increases by 23% and 12% during the cooling and heating operations, respectively. When operating with a balanced well cross-mixed heat exchange system, the initial temperature of the underground was constant with a small standard deviation of 0.08–0.12 °C.

ACS Style

Donggyu Kim; Myungkwan Lim; Byeongseok Yu; Changhee Lee. Smart Heating and Cooling Heat Pump System by Standing Column Well and Cross-Mixing Balancing Well Heat Exchangers. Applied Sciences 2020, 10, 7643 .

AMA Style

Donggyu Kim, Myungkwan Lim, Byeongseok Yu, Changhee Lee. Smart Heating and Cooling Heat Pump System by Standing Column Well and Cross-Mixing Balancing Well Heat Exchangers. Applied Sciences. 2020; 10 (21):7643.

Chicago/Turabian Style

Donggyu Kim; Myungkwan Lim; Byeongseok Yu; Changhee Lee. 2020. "Smart Heating and Cooling Heat Pump System by Standing Column Well and Cross-Mixing Balancing Well Heat Exchangers." Applied Sciences 10, no. 21: 7643.

Original article
Published: 27 February 2020 in Transactions of the Indian Institute of Metals
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The joining of Alloy 718 using conventional welding techniques is not feasible due to the micro-fissuring and heat-affected zone cracking. There are very few joining methods available to produce successful joints without defects. In this study, friction welding was applied to obtain high-quality joints for Inconel 718. Two major welding parameters were identified to obtain the highest tensile strength and elongation. Post-weld heat treatment technique was used to enhance joints strength. The obtained consequences showed that the strength and axial shortening increased with the increase of heating pressure and heating time. The individual effect of heating pressure on tensile strength and heating time on the axial shortening was higher than other parameters. The joints strength improved after heat treatment over as-welded and base metal tensile strength. The microstructure of the joints significantly changed due to heat treatment and showed the homogeneous metallurgical properties compared to the as-welded microstructure.

ACS Style

Yu-Sik Kong; Muralimohan Cheepu; Dong-Gyu Kim. Microstructure and Mechanical Properties of Friction-Welded and Post-Heat-Treated Inconel 718. Transactions of the Indian Institute of Metals 2020, 73, 1449 -1453.

AMA Style

Yu-Sik Kong, Muralimohan Cheepu, Dong-Gyu Kim. Microstructure and Mechanical Properties of Friction-Welded and Post-Heat-Treated Inconel 718. Transactions of the Indian Institute of Metals. 2020; 73 (6):1449-1453.

Chicago/Turabian Style

Yu-Sik Kong; Muralimohan Cheepu; Dong-Gyu Kim. 2020. "Microstructure and Mechanical Properties of Friction-Welded and Post-Heat-Treated Inconel 718." Transactions of the Indian Institute of Metals 73, no. 6: 1449-1453.

Journal article
Published: 15 March 2019 in Journal of Marine Science and Engineering
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Many researchers have conducted experiments on the position and nozzle conditions in the exhaust pipe of a stage/swirl mixer, as well as the injection position required to satisfy the International Maritime Organisation (IMO) regulations. In this study, an SCR (Selective catalytic reduction) system was designed through basic and detailed designs. The performance of the components was verified through a single-component performance test for the detailed design components, and the total nitrogen oxide (NOx) reduction efficiency was predicted using the proven system. Subsequently, the system was applied to an actual engine, and the performance was verified according to the engine operating conditions using the experimental variables. The NOx reduction rate and NH3 slip characteristics in relation to MCR (Maximum Continuous Rating) conditions using the optimised SCR system indicate that the NOx reduction rate exceeds 80% in all MCR conditions. Finally, the SCR system developed in this study proves that the performance of the SCR system satisfies the IMO regulatory requirements.

ACS Style

Dongkyu Kim; Changhee Lee. SCR Performance Evaluations in Relation to Experimental Parameters in a Marine Generator Engine. Journal of Marine Science and Engineering 2019, 7, 67 .

AMA Style

Dongkyu Kim, Changhee Lee. SCR Performance Evaluations in Relation to Experimental Parameters in a Marine Generator Engine. Journal of Marine Science and Engineering. 2019; 7 (3):67.

Chicago/Turabian Style

Dongkyu Kim; Changhee Lee. 2019. "SCR Performance Evaluations in Relation to Experimental Parameters in a Marine Generator Engine." Journal of Marine Science and Engineering 7, no. 3: 67.

Journals
Published: 05 May 2017 in RSC Advances
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G-COS was compared with COS for its influence on the proliferation of AGS human gastric cancer cells, showing an increase in the accumulation of cells in the sub-G1 phase and early apoptosis.

ACS Style

BoMi Ryu; So-Yeon Kim; Thanh-Sang Vo; Won-Suk Kim; Dong Gyu Kim; Se-Kwon Kim. Characterization of the in vitro effects of gallic acid-grafted-chitooligosaccharides in the suppression of AGS human gastric cancer cell proliferation. RSC Advances 2017, 7, 24561 -24568.

AMA Style

BoMi Ryu, So-Yeon Kim, Thanh-Sang Vo, Won-Suk Kim, Dong Gyu Kim, Se-Kwon Kim. Characterization of the in vitro effects of gallic acid-grafted-chitooligosaccharides in the suppression of AGS human gastric cancer cell proliferation. RSC Advances. 2017; 7 (39):24561-24568.

Chicago/Turabian Style

BoMi Ryu; So-Yeon Kim; Thanh-Sang Vo; Won-Suk Kim; Dong Gyu Kim; Se-Kwon Kim. 2017. "Characterization of the in vitro effects of gallic acid-grafted-chitooligosaccharides in the suppression of AGS human gastric cancer cell proliferation." RSC Advances 7, no. 39: 24561-24568.

Journal article
Published: 29 January 2017 in International Journal of Biological Macromolecules
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The main aim of this study was to obtain porous antimicrobial composites consisting of chitosan, alginate, and biosynthesized silver nanoparticles (AgNPs). Chitosan and alginate were used owing to their pore-forming capacity, while AgNPs were used for their antimicrobial property. The developed porous composites of chitosan-alginate-AgNPs were characterized using Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy, X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM). The FT-IR results revealed the presence of a strong chemical interaction between chitosan and alginate due to polyelectrolyte complex; whereas, the XRD results confirmed the presence of AgNPs in the composites. The dispersion of AgNPs in the porous membrane was uniform with a pore size of 50–500 μm. Antimicrobial activity of the composites was checked with Escherichia coli and Staphylococcus aureus. The developed composites resulted in the formation of a zone of inhibition of 11 ± 1 mm for the Escherichia coli, and 10 ± 1 mm for Staphylococcus aureus. The bacterial filtration efficiency of chitosan-alginate-AgNPs was 1.5-times higher than that of the chitosan-alginate composite. The breast cancer cell line MDA-MB–231 was used to test the anticancer activity of the composites. The IC50 value of chitosan-alginate-AgNPs on MDA-MB–231 was 4.6 mg. The developed chitosan-alginate-AgNPs composite showed a huge potential for its applications in antimicrobial filtration and cancer treatment.

ACS Style

Jayachandran Venkatesan; Jin-Young Lee; Dong Seop Kang; Sukumaran Anil; Se-Kwon Kim; Min Suk Shim; Dong Gyu Kim. Antimicrobial and anticancer activities of porous chitosan-alginate biosynthesized silver nanoparticles. International Journal of Biological Macromolecules 2017, 98, 515 -525.

AMA Style

Jayachandran Venkatesan, Jin-Young Lee, Dong Seop Kang, Sukumaran Anil, Se-Kwon Kim, Min Suk Shim, Dong Gyu Kim. Antimicrobial and anticancer activities of porous chitosan-alginate biosynthesized silver nanoparticles. International Journal of Biological Macromolecules. 2017; 98 ():515-525.

Chicago/Turabian Style

Jayachandran Venkatesan; Jin-Young Lee; Dong Seop Kang; Sukumaran Anil; Se-Kwon Kim; Min Suk Shim; Dong Gyu Kim. 2017. "Antimicrobial and anticancer activities of porous chitosan-alginate biosynthesized silver nanoparticles." International Journal of Biological Macromolecules 98, no. : 515-525.

Short communication
Published: 16 January 2017 in Carbohydrate Research
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Positive charges of chitooligomer (COS) enable COS to interact with negatively charged anionic groups on the cell surface resulting in an improvement in the biological activity of COS and its derivatives. In this study, 4-hydroxybenzaldehyde-COS (HB-COS) was synthesized and investigated for its abilities against H2O2-induced oxidative stress in microglia BV-2 cells. Under oxidative stress, HB-COS significantly attenuated reactive oxygen species (ROS) generation and DNA oxidation, and upregulated the protein levels of antioxidative enzymes. HB-COS is therefore proposed as a potential protective agent against neuronal damage.

ACS Style

Sea-Hun Oh; BoMi Ryu; Dai-Hung Ngo; Won-Suk Kim; Dong Gyu Kim; Se-Kwon Kim. 4-hydroxybenzaldehyde-chitooligomers suppresses H 2 O 2 -induced oxidative damage in microglia BV-2 cells. Carbohydrate Research 2017, 440-441, 32 -37.

AMA Style

Sea-Hun Oh, BoMi Ryu, Dai-Hung Ngo, Won-Suk Kim, Dong Gyu Kim, Se-Kwon Kim. 4-hydroxybenzaldehyde-chitooligomers suppresses H 2 O 2 -induced oxidative damage in microglia BV-2 cells. Carbohydrate Research. 2017; 440-441 ():32-37.

Chicago/Turabian Style

Sea-Hun Oh; BoMi Ryu; Dai-Hung Ngo; Won-Suk Kim; Dong Gyu Kim; Se-Kwon Kim. 2017. "4-hydroxybenzaldehyde-chitooligomers suppresses H 2 O 2 -induced oxidative damage in microglia BV-2 cells." Carbohydrate Research 440-441, no. : 32-37.

Journal article
Published: 31 December 2016 in Journal of Chitin and Chitosan
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There have been extensive studies on naturally occurring polymers such as chitosan. Chitosan have been studied as primary carrier of several therapeutic drugs and other biomolecules. The use of chitosan in this area of biomedical research is favored by its biocompatible, biodegradable, hemostatic maintenance, anti-microbial, anticancerogenic, and anticholesteremic properties. The use of chitosan nanoparticles have favored encapsulation of therapeutic anti-tumor drugs producing control and sustained release profiles. In this review we examined the roles chitosan nanoparticles in controlled and sustain release mechanisms and how they are co-conjugated with other materials for enhanced target delivery of drug in cancer cells.

ACS Style

Baboucarr Lowe; Kwan-Young Chang; Jae-Ho Hwang; Jayachandran Venkatesan; Dong Gyu Kim; Se-Kwon Kim. Role of Chitosan nanoparticles in drug delivery. Journal of Chitin and Chitosan 2016, 21, 229 -235.

AMA Style

Baboucarr Lowe, Kwan-Young Chang, Jae-Ho Hwang, Jayachandran Venkatesan, Dong Gyu Kim, Se-Kwon Kim. Role of Chitosan nanoparticles in drug delivery. Journal of Chitin and Chitosan. 2016; 21 (4):229-235.

Chicago/Turabian Style

Baboucarr Lowe; Kwan-Young Chang; Jae-Ho Hwang; Jayachandran Venkatesan; Dong Gyu Kim; Se-Kwon Kim. 2016. "Role of Chitosan nanoparticles in drug delivery." Journal of Chitin and Chitosan 21, no. 4: 229-235.

Journal article
Published: 01 December 2015 in Journal of Functional Foods
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Floridoside [α-D-galactopyranosyl-(1-2)-L-glycerol] from marine red algae Laurencia undulata (L. undulata) has received considerable attention as a bioactive compound especially for its beneficial effects on human health. This study aimed to evaluate the effect of floridoside in the process of osteogenic differentiation in murine bone marrow mesenchymal (D1) cells and elucidate the mechanism underlying the effect. Under the osteogenic differentiation condition in D1 cells, floridoside showed up-regulation of the sequential markers such as alkaline phosphate (ALP), type I collagen, osteocalcin/osteopontin and mineralisation in the progression. In addition, mRNA levels of Runx-2 and Osterix with floridoside showed remarkable increase at days 14 and 21 compared to the control cells with only ODM media. Thus, our results suggest that floridoside can promote osteogenic differentiation via controlling the sequential markers at the early and late stages of osteogenic differentiation in D1 cells, and it may be a potential therapeutic agent for bone formation.

ACS Style

BoMi Ryu; Yong-Xin Li; Kyong-Hwa Kang; Se-Kwon Kim; Dong Gyu Kim. Floridoside from Laurencia undulata promotes osteogenic differentiation in murine bone marrow mesenchymal cells. Journal of Functional Foods 2015, 19, 505 -511.

AMA Style

BoMi Ryu, Yong-Xin Li, Kyong-Hwa Kang, Se-Kwon Kim, Dong Gyu Kim. Floridoside from Laurencia undulata promotes osteogenic differentiation in murine bone marrow mesenchymal cells. Journal of Functional Foods. 2015; 19 ():505-511.

Chicago/Turabian Style

BoMi Ryu; Yong-Xin Li; Kyong-Hwa Kang; Se-Kwon Kim; Dong Gyu Kim. 2015. "Floridoside from Laurencia undulata promotes osteogenic differentiation in murine bone marrow mesenchymal cells." Journal of Functional Foods 19, no. : 505-511.

Journal article
Published: 01 December 2015 in Journal of Photochemistry and Photobiology B: Biology
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Although ultraviolet B (UVB) has a low level of skin penetration, it readily results in epidermal sunburn of keratinocytes that are destined to apoptosis after sun expose, and leads to DNA damage. Dioxinodehydroeckol (DHE), a phlorotannin from Ecklonia cava has been explored for its preventive activity against UVB-induced apoptosis in human keratinocyte (HaCaT) cells; however, the protective effects of treatment with low doses of DHE on UVB-damaged cells post-UVB exposure and their underlying mechanisms still remain unclear. The HaCaT cells were exposed to 20 mJ cm− 2 of UVB irradiation which is the minimal erythema dose (MED) for individuals to be able to tan, and the expression levels of Bax/Bcl-2 and caspase-3,-8, -9 which are associated genes with apoptosis were investigated when we either treated cells with DHE doses after UVB irradiation or exposed them to UVB only. Our results suggest insight into proposed mechanistic pathway of protective activity of DHE on the HaCaT cells from UVB-induced apoptosis, indicating the benefit of DHE as a repair agent for skin damage against UVB.

ACS Style

BoMi Ryu; Byul-Nim Ahn; Kyong-Hwa Kang; Young-Sang Kim; Yong-Xin Li; Chang-Suk Kong; Se-Kwon Kim; Dong Gyu Kim. Dioxinodehydroeckol protects human keratinocyte cells from UVB-induced apoptosis modulated by related genes Bax/Bcl-2 and caspase pathway. Journal of Photochemistry and Photobiology B: Biology 2015, 153, 352 -357.

AMA Style

BoMi Ryu, Byul-Nim Ahn, Kyong-Hwa Kang, Young-Sang Kim, Yong-Xin Li, Chang-Suk Kong, Se-Kwon Kim, Dong Gyu Kim. Dioxinodehydroeckol protects human keratinocyte cells from UVB-induced apoptosis modulated by related genes Bax/Bcl-2 and caspase pathway. Journal of Photochemistry and Photobiology B: Biology. 2015; 153 ():352-357.

Chicago/Turabian Style

BoMi Ryu; Byul-Nim Ahn; Kyong-Hwa Kang; Young-Sang Kim; Yong-Xin Li; Chang-Suk Kong; Se-Kwon Kim; Dong Gyu Kim. 2015. "Dioxinodehydroeckol protects human keratinocyte cells from UVB-induced apoptosis modulated by related genes Bax/Bcl-2 and caspase pathway." Journal of Photochemistry and Photobiology B: Biology 153, no. : 352-357.

Journal article
Published: 21 August 2015 in Materials
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Nano-Hydroxyapatite (nHA) was isolated from salmon bone by alkaline hydrolysis. The resulting nHA was characterized using several analytical tools, including thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), to determine the purity of the nHA sample. The removal of organic matter from the raw fish was confirmed by TGA. FT-IR confirmed the presence of a carbonated group and the similarities to synthetic Sigma HA. XRD revealed that the isolated nHA was amorphous. Microscopy demonstrated that the isolated nHA possessed a nanostructure with a size range of 6–37 nm. The obtained nHA interacted with mesenchymal stem cells (MSCs) and was non-toxic. Increased mineralization was observed for nHA treated MSCs compared to the control group. These results suggest that nHA derived from salmon is a promising biomaterial in the field of bone tissue engineering.

ACS Style

Jayachandran Venkatesan; Baboucarr Lowe; Panchanathan Manivasagan; Kyong-Hwa Kang; Elna P. Chalisserry; Sukumaran Anil; Dong Gyu Kim; Se-Kwon Kim. Isolation and Characterization of Nano-Hydroxyapatite from Salmon Fish Bone. Materials 2015, 8, 5426 -5439.

AMA Style

Jayachandran Venkatesan, Baboucarr Lowe, Panchanathan Manivasagan, Kyong-Hwa Kang, Elna P. Chalisserry, Sukumaran Anil, Dong Gyu Kim, Se-Kwon Kim. Isolation and Characterization of Nano-Hydroxyapatite from Salmon Fish Bone. Materials. 2015; 8 (8):5426-5439.

Chicago/Turabian Style

Jayachandran Venkatesan; Baboucarr Lowe; Panchanathan Manivasagan; Kyong-Hwa Kang; Elna P. Chalisserry; Sukumaran Anil; Dong Gyu Kim; Se-Kwon Kim. 2015. "Isolation and Characterization of Nano-Hydroxyapatite from Salmon Fish Bone." Materials 8, no. 8: 5426-5439.

Journal article
Published: 01 June 2015 in International Journal of Biological Macromolecules
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Polysaccharide-based bioflocculants have attracted considerable attention in recent years due to their biodegradable, harmless and negligible secondary pollution. Bioflocculants are organic macromolecular substances secreted by microorganisms. A simple, cost-effective and green method was developed for the biosynthesis of silver nanoparticles using polysaccharides as reducing and stabilizing agents. In this paper, we report on the production and optimization of polysaccharide-based bioflocculant for the green synthesis of silver nanoparticles by Streptomyces sp. MBRC-91. Medium composition and culture conditions for polysaccharide-based bioflocculants were statistically optimized by response surface methodology (RSM). The bioflocculant production was statistically optimized with most significant factors, namely palm jaggery (18.73g/L), yeast extract (2.07g/L), K2HPO4 (3.74g/L) and NaCl (0.38g/L), respectively. The biosynthesized silver nanoparticles were characterized by UV-vis spectroscopy, XRD, FTIR, FESEM, EDXA and HRTEM. The biosynthesized silver nanoparticles revealed strong antibacterial activity in sewage water and this result could make a new avenue in the wastewater treatment. Therefore, the biosynthesized silver nanoparticles can be extended as an alternative for the development of new bactericidal bionanomaterials for wastewater treatment and biotechnological applications.

ACS Style

Panchanathan Manivasagan; Kyong-Hwa Kang; Dong Gyu Kim; Se-Kwon Kim. Production of polysaccharide-based bioflocculant for the synthesis of silver nanoparticles by Streptomyces sp. International Journal of Biological Macromolecules 2015, 77, 159 -167.

AMA Style

Panchanathan Manivasagan, Kyong-Hwa Kang, Dong Gyu Kim, Se-Kwon Kim. Production of polysaccharide-based bioflocculant for the synthesis of silver nanoparticles by Streptomyces sp. International Journal of Biological Macromolecules. 2015; 77 ():159-167.

Chicago/Turabian Style

Panchanathan Manivasagan; Kyong-Hwa Kang; Dong Gyu Kim; Se-Kwon Kim. 2015. "Production of polysaccharide-based bioflocculant for the synthesis of silver nanoparticles by Streptomyces sp." International Journal of Biological Macromolecules 77, no. : 159-167.