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이성호,김광락,안도희,유재형,백승우,손종식,임성팔,정홍석 한국공업화학회 2001 응용화학 Vol.5 No.2
Hydrogen absorption experiments were carried out by the titanium(Ti) sponge for investigating the characteristics of hydrogen absorption. From experimental results, Ti sponges showed the high hydrogen absorption capacity inspite of low reaction temperature. The H/M which mean the capacity of hydrogen absorption was measured 2.0 for Ti sponge in the experimental condition of 25℃. The effects of the reaction temperature, activation conditions, and the presence of helium in the hydrogen were investigated.
Antimutagenic Activity of Chitosan Oligosaccharides
Shon, Yun-Hee,Ha, Young-Min,Nam, Kyung-Soo 동국대학교 자연과학연구원 2000 자연과학연구 논문집 Vol.5 No.-
The antimutagenic effects of chitosan oligosaccharide I and chitosan oligosaccharide Ⅱ were examined using the Ames/Salmonella test. No antimutagenic activity was found against the directly-acting mutagens, 4-nitro-o-phenylenediamine(NPD) using the tester strain TA 98 and sodium azide (NaN3) using the tester strain TA 100 in the absence of S9 mix. In contrast, chitosan oligosaccharide showed inhibitory effect on the mutagenicities of the indirectly-acting mutagens, 2-aminofluorene (2-AF) and 2-amino-3,8-dimethylimidazo[4,5-f] quinoxaline(MeIQx) using the tester strain TA 98 and benzo[a]pyrene (B[a]P) using the tester strain TA 100 in the presence of S9. These results suggested that chitosan oligosaccharide had antimutagenic properties and may play a role in the prevention of cancer.
Shon, Yuran,Kim, Hyun,Hwang, Hong Seop,Bae, Eun Sil,Eom, Taesik,Park, Eui Jung,Ahn, Wha-Seung,Wie, Jeong Jae,Shim, Bong Sup Elsevier 2017 Sensors and actuators. B Chemical Vol.244 No.-
<P><B>Abstract</B></P> <P>Thylakoids, on which complete sets of photosynthetic membrane proteins are contained, behave as soft nanoparticles of a few tens nm sizes. Thus, we separated the thylakoid extracts from spinach chloroplasts and densely organized them in a film with either insulating polyethyleneimine (PEI) or conducting polyaniline (PANI) by molecularly controlled layer-by-layer (LBL) assembly. The resulting nanostructured composite films demonstrated photoelectrochemical activities with thylakoids whose stabilities were significantly improved on the charge balanced LBL multilayers compared to one on a randomly deposited film or in solution. The thylakoid LBL films continuously generated photochemical electrons for longer than 130h with the 2,6-dichlorophenolindophenol (DCPIP) mediated photosynthetic energy conversion cycle while photoactivities of thylakoid moiety slowly decreased in the open circuit potential measurements throughout which the photosynthetic redox cycles were incomplete. As the photofunctional groups of the thylakoid films originated from a biotic system and the photofuctional thylakoids were exceptionally well preserved on the charge-balanced artificial structures, the developed thylakoid LBL film have shown inherent biocompatibility upon PC12 neural cell attachment and differentiation tests, which are essential qualities for emerging human-friendly electronic applications such as disposable electronics, artificial retina, and implantable neural interfacing meditronics as well as cell-free photosynthetic production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thylakoid complexes, extracted from spinach chloroplasts, were densely organized in a film with insulating polyethyleneimine (PEI) or conducting polyaniline (PANI) by layer-by-layer (LBL) assembly. </LI> <LI> The thylakoid LBL films continuously generated photochemical electrons for longer than 130h. </LI> <LI> The thylakoid LBL film has shown inherent biocompatibility upon PC12 neural cell attachment and differentiation tests. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Shon, I.J.,Lee, D.M.,Doh, J.M.,Yoon, J.K.,Ko, I.Y. Elsevier Sequoia 2011 Materials science & engineering. properties, micro Vol.528 No.3
A dense nanostructured MoSi<SUB>2</SUB>-SiC-Si<SUB>3</SUB>N<SUB>4</SUB> composite was sintered by the high frequency induction heating method within 2min from mechanically activated powder of Mo<SUB>2</SUB>N, Mo<SUB>2</SUB>C and Si. Highly dense MoSi<SUB>2</SUB>-SiC-Si<SUB>3</SUB>N<SUB>4</SUB> composite was produced under simultaneous application of a 80MPa pressure and the induced current. Mechanical properties and grain size of the composite were investigated. The average hardness and fracture toughness values obtained were 1420kg/mm<SUP>2</SUP> and 4.5MPam<SUP>½</SUP>, respectively.
Shon, Chae-Hwa,Yi, Sang-Hwa,Lee, Heun-Jin,Kang, Dong-Sik The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.6
The paper investigates three types of transfer function methods for detecting displacements of winding in a model transformer. To acquire these transfer functions, the measuring method of input voltage, current and its response is used in impulse method. The applied impulse voltages had three rising times, which were short rising time (less than 0.6 ${\mu}s$), medium rising time (about 0.8 ${\mu}s$) and long rising time (about 1 ${\mu}s$) in front waves. Every 10 measurements of voltage and current waves were averaged from 50 measurements of voltage and current waves. These transfer functions were tested in normal, 24mm elevated and 48mm elevated windings conditions and were analyzed with correlation coefficients and spectrum deviations. In the analysis, the results depend on the types of transfer functions and the rising times of input voltages.
Shon, In-Jin,Wang, Hee-Ji,Cho, Sung-Wook,Kim, Wonbaek The Japan Institute of Metals 2011 Materials transactions Vol.52 No.9
<P>Nano-powders of 1.5TiAl and Al<SUB>2</SUB>O<SUB>3</SUB> were synthesized from 1.5TiO<SUB>2</SUB> and 3.5Al powders by high energy ball milling. Nanocrystalline Al<SUB>2</SUB>O<SUB>3</SUB> reinforced composite was consolidated by high frequency induction heated sintering within 2 min from mechanochemically synthesized powders of Al<SUB>2</SUB>O<SUB>3</SUB> and 1.5TiAl. The relative density of the composite was 99%. The average hardness and fracture toughness values obtained were 1340 kg/mm<SUP>2</SUP> and 9 MPa·m<SUP>1⁄2</SUP>, respectively.</P>