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Vibrational and Electronic Spectroscopic Characterizations of Amino Acid-Metal Complexes
Jaehong Han,Yong Seok Chi 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
For vibrational and electronic spectroscopic characterizations of α-amino acid mineral chelates, nine water-soluble α-amino acids of Ala, Asn, Gln, His, Ile, Lys, Pro, Thr, and Val were used to prepare metal complexes with Fe(II), Fe(III), Cu(II), and Zn(II) ions. The α-amino acid-metal complexes were characterized by FT-IR and UV-Vis spectrometers to determine the complex formation. The vibrational energy changes of the ammonium and carboxylate groups by FT-IR spectroscopy were characteristic features in the amino acid-metal complex formation. The electronic transition energy changes determined by UV-Vis spectrometer were also characteristic to the Fe(II), Fe(III), and Cu(II) complexes. The amino acid-Zn(II) complexes did not show these changes, because there was no absorption band due to d-d transitions.
Hanseniaspora thailandica BC9 β-Glucosidase for the Production of β-D-Hexyl Glucoside
( Sujittra Phongprathet ),( Kanit Vichitphan ),( Jaehong Han ),( Sukanda Vichitphan ),( Jutaporn Sawaengkaew ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.4
For biotechnological production of high-valued β-D-hexyl glucoside, the catalytic properties of Hanseniaspora thailandica BC9 β-glucosidase purified from the periplasmic fraction were studied, and the transglycosylation activity for the production of β-D-hexyl glucoside was optimized. The constitutive BC9 β-glucosidase exhibited maximum specific activity at pH 6.0 and 40ºC, and the activity of BC9 β-glucosidase was not significantly inhibited by various metal ions. BC9 β-glucosidase did not show a significant activity of cellobiose hydrolysis, but the activity was rather enhanced in the presence of sucrose and medium-chain alcohols. BC9 β-glucosidase exhibited enhanced production of β-D-hexyl glucoside in the presence of DMSO, and 62% of β-D-hexyl glucoside conversion was recorded in 4 h in the presence of 5% 1-hexanol and 15% DMSO.
Lim Han Hyuk,Kim Yoo Mi,Lee Gyung Min,Yu Jaehong,Han Heon-Seok,Yu Jeesuk 대한의학회 2022 Journal of Korean medical science Vol.37 No.11
Background: The study aimed to compare the growth responses to 3 years of growth hormone (GH) treatment in children and adolescents with GH deficiency (GHD) according to idiopathic, organic, isolated (IGHD), and multiple pituitary hormone deficiency (MPHD). Methods: Total 163 patients aged 2–18 years (100 males and 63 females; 131 idiopathic and 32 organic GHD; 129 IGHD and 34 MPHD) were included from data obtained from the LG Growth Study. Parameters of growth responses and biochemical results were compared during the 3-year GH treatment. Results: The baseline age, bone age (BA), height (Ht) standard deviation score (SDS), weight SDS, mid-parental Ht SDS, predicted adult Ht (PAH) SDS, and insulin like growth factor-1 (IGF-1) SDS were significantly higher in the organic GHD patients than in the idiopathic GHD patients, but peak GH on the GH-stimulation test, baseline GH dose, and mean 3-year-GH dosage were higher in the idiopathic GHD patients than in the organic GHD patients. The prevalence of MPHD was higher in the organic GHD patients than in the idiopathic GHD patients. Idiopathic MPHD subgroup showed the largest increase for the ΔHt SDS and ΔPAH SDS during GH treatment, and organic MPHD subgroup had the smallest mean increase after GH treatment, depending on ΔIGF-1 SDS and ΔIGF binding protein-3 (IGFBP-3) SDS. The growth velocity and the parental-adjusted Ht gain were greater in the idiopathic GHD patients than the organic GHD patients during the 3-year GH treatment, which may have been related to the different GH dose, ΔIGF-1 SDS, and ΔIGFBP-3 SDS between two groups. Multiple linear regression analysis revealed that baseline IGF-1 SDS, BA, and MPH SDS in idiopathic group and baseline HT SDS in organic group are the most predictable parameters for favorable 3-year-GH treatment. Conclusion: The 3-year-GH treatment was effective in both idiopathic and organic GHD patients regardless of the presence of MPHD or underlying causes, but their growth outcomes were not constant with each other. Close monitoring along with appropriate dosage of GH and annual growth responses, not specific at baseline, are more important in children and adolescents with GHD for long-term treatment.
Jaehong Lee(이재홍),Seung-Hoon Um(엄승훈),Min-Young Na(나민영),Hye-Jung Chang(장혜정),Hyung-Seop Han(한형섭),Yu-Chan Kim(김유찬),Hojeong Jeon(전호정) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Ti alloy, which be commonly used in medical implants for hard tissue, has high corrosion resistance from body fluid. Nevertheless, Ti alloy has been considered as a bio-inert material which might form fibrous tissue and have low osseointegration because of Ti oxide film formed naturally in oxygen environment. To improve the osseointegration, surface roughness and structure modification of bio-inert Ti alloy has been attempted. And currently, the surface modification by laser has been developed for laser induced periodic surface structure (LIPSS) to provide nano/micro scale cell favor morphology to bone cells. However, the bio-inert property inherently cannot be changed to bio-active. In this study, using LIPSS, we coated hydroxyapatite on surface of Ti6Al4V to provide nano/micro scale bio-active morphology to bone cells. The hydroxyapatite coatings on LIPSS were observed and analyzed by SEM, EDX, XRD and TEM. Additionally, the improved cell attachment was showed on LIPSS coated with hydroxyapatite.
History and Trends of Data Education in Korea - KISTI Data Education Based on 2001-2019 Statistics
( Jaehong Min ),( Sunggeun Han ),( Bu-young Ahn ) 한국인터넷정보학회 2020 인터넷정보학회논문지 Vol.21 No.6
Big data, artificial intelligence (AI), and machine learning are keywords that represent the Fourth industrial Revolution. In addition, as the development of science and technology, the Korean government, public institutions and industries want professionals who can collect, analyze, utilize and predict data. This means that data analysis and utilization education become more important. Education on data analysis and utilization is increasing with trends in other academy. However, it is true that not many academy run long-term and systematic education. Korea Institute of Science and Technology Information (KISTI) is a data ecosystem hub and one of its performance missions has been providing data utilization and analysis education to meet the needs of industries, institutions and governments since 1966. In this study, KISTI’s data education was analyzed using the number of curriculum trainees per year from 2001 to 2019. With this data, the change of interest in education in information and data field was analyzed by reflecting social and historical situations. And we identified the characteristics of KISTI and trainees. It means that the identity, characteristics, infrastructure, and resources of the institution have a greater impact on the trainees’ interest of data-use education.In particular, KISTI, as a research institute, conducts research in various fields, including bio, weather, traffic, disaster and so on. And it has various research data in science and technology field. The purpose of this study can provide direction forthe establishment of new curriculum using data that can represent KISTI's strengths and identity. One of the conclusions of this paper would be KISTI's greatest advantages if it could be used in education to analyze and visualize many research data. Finally, through this study, it can expect that KISTI will be able to present a new direction for designing data curricula with quality education that can fulfill its role and responsibilities and highlight its strengths.
Formation of Ni silicide from atomic layer deposited Ni
Jaehong Yoon,Soohyeon Kim,김한길,김수현,김형준,Han-Bo-Ram Lee 한국물리학회 2016 Current Applied Physics Vol.16 No.7
The silicidation of Ni deposited by plasma-enhanced atomic layer deposition with NH3 plasma and thermal atomic layer deposition using NH3 gas were comparatively studied. A SiNx interlayer was formed between the Ni deposited by plasma-enhanced atomic layer deposition and the Si substrate due to the direct exposure of the substrate to plasma, while no interlayer was observed when using thermal atomic layer deposition. In the plasma-enhanced atomic layer deposition, the diffusion of Ni was suppressed by the SiNx interlayer, so no Ni2Si phase was formed and its formation temperature increased. Ni formed by thermal atomic layer deposition showed sequential phase transformations to Ni2Si, NiSi, and NiSi2 with increased annealing temperatures. In the nanosized contact holes, a large amount of NiSi2 was formed due to the limited supply of Ni. These results provide important information for the fabrication of silicide in nanoscale 3D devices.
High efficiency AZO-InP nanopillar-based heterojunction solar cells
Jaehong Yoon,Soohyeon Kim,김한길,김수현,Hyungjun Kim,Han-Bo-Ram Lee 한국물리학회 2016 Current Applied Physics Vol.16 No.7
This paper reports heterojunction solar cells consisting of InP nanopillars and aluminum-doped zinc oxide (AZO). The AZO layer sputtered on an InP surface is used not only as a transparent electrode, but also as an excellent rectifying junction with InP. More importantly, the wide-bandgap-AZO functions as a window layer of solar cells, thereby suppressing carrier recombination loss at the AZO-InP heterointerface. The InP nanopillar array reduces the light reflectance and increases the optical path length of the solar cells. The AZO-InP nanopillar-based heterojunction solar cells exhibited an open-circuit voltage, short-circuit current density, fill-factor, and power-conversion efficiency of 0.68 V, 36.8 mA/cm2, 68%, and 17.1%, respectively, under air-mass 1.5 simulated solar illumination (100 mW/cm2).