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Characterization of a Fe-Based Soft Magnetic Alloy System with High Saturation Magnetization
Han, Bo Kyeong,Kim, Sumin,Choi-Yim, Haein American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>The ratios of Fe/Co and Fe/B in a ferromagnetic alloy system, Fe(87-x-y) Co-x Ti-7 Zr-6 By (x = 20, 30, and 40 at% and y = 2 and 4 at%), which was produced by the melt-spinning technique in the form of thin ribbons, were investigated to improve the saturation magnetization. The thermal properties T-x were in the range of 792.0 K to 838.0 K, and it decreased by decreasing Fe/Co ratio. In the as-spun amorphous ribbons, the saturation magnetization and coercivity ranged from 137.5 emu/g to 164.2 emu/g and from 0.027 Oe to 1.245 Oe, respectively. The optimum Fe/Co ratio for the Fe(83-x) Co-x Ti-7 Zr-6 B-4 system was determined to be 64:36. In other words, the optimum system was Fe-60 Co-25 Ti-7 Zr-6 B-2, which exhibited robust soft magnetic properties, such as a low coercivity of 0.252 Oe, and high saturation magnetization of 164.2 emu/g (1.55 T). Also, in this system, magnetic properties such as the saturation magnetization and coercivity increased with decreasing Fe/Co ratio.</P>
Bo-Kyeong Han,Hye-in Jo,Jin Kyu Lee,Ki Buem Kim,Haein Yim 한국자기학회 2013 Journal of Magnetics Vol.18 No.4
The metallic glass ribbons of [(FexCo1-x)0.75B0.2Si0.05]96Mo₄ (x = 0, 0.3, 0.6, 0.9 at.%) and [(FexCo1-x)0.75B0.2Si0.05]96Nb₄ (x = 0, 0.3, 0.6, 0.9 at.%) were obtained by melt spinning with 25-30 μm thickness. The thermal stability, mechanical properties and magnetic properties of Fe-Co-B-Si based systems were investigated. The values of thermal stability were measured using differential scanning calorimetry (DSC), including glass transition temperature (Tg), crystallization temperature (Tx) and supercooled liquid region (ΔTx=Tx?Tg). These amorphous ribbons were identified as fully amorphous, using X-ray diffraction (XRD). The mechanical properties of Febased samples were measured by nano-indentation. Magnetic properties of the amorphous ribbons were measured by a vibrating sample magnetometer (VSM). The amorphous ribbons of [(FexCo1-x)0.75B0.2Si0.05]96Mo₄ (x = 0, 0.3, 0.6, 0.9 at.%) and [(FexCo1-x)0.75B0.2Si0.05]96Nb₄ (x = 0, 0.3, 0.6, 0.9 at.%) exhibited soft magnetic properties with low coercive force (Hc) and high saturation magnetization (Ms).
An effect of thermo-stimulation of lower abdomen on autonomic nervous system: An experimental study
Kim, Kyeong Han,Kim, Jong Uk,Kim, Bo Hyun,Shin, Jin Hyeon,Hong, Seong Jin,Lee, Sang Ryong,Yook, Tae-han KOREAN PHARMACOPUNCTURE INSTITUTE 2018 Journal of pharmacopuncture Vol.21 No.2
Objective: DIt is need to evaluate he changes of the bio-signals through the hot-cold stimulation in the CV4. Methods: The 30 healthy participants were enrolled and randomly allocated, to one of three groups(10 participants for each group): the hot stone therapy(HST) group, or the cold stone therapy(CST) group or no treatment group(NT). All the participants took a rest for 10 minutes for stability before the test. And additional 10 minute rest after measurements of skin test and sEMG. After that two group received hot or cold stone therapy for 30 minutes and one group treated nothing with HRV test. Results: HRV LF value showed a significant increase over time in all three groups, but there was no significant difference between groups but HRV HF value did not show any significant difference with time in all three groups and there was no significant difference between groups. sEMG value showed a significant increase in the left side of the masseter muscle of the HST group and sebum levels was a significant decreased in HST group but no significant meaning was found. Conclusion: There was no objective evidence that hot-cold stimulation produced bio-signals changes in comparison to the control group, but additional studies are needed as the subjects were limited.
Chon-Sik Kang,Kyeong-Hoon Kim,Young-Keun Cheong,Jae-Han Son,Jong-Chul Park,Kyong-Ho Kim,Kwang-Geun Park,Ouk-Kyu Han,Gi-Heung Hong,Jin-Kyeong Choi,Seong-Tae Lee,Jeong-Suk Bae,Bo-Kyeong Kim,Chulsoo Park 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
“Jojoong”, a winter wheat(Triticum aestivum L.) cultivar was developed by the National Institute of Crop Science, RDA. It was derived from the cross “Suwon272/Olgeuru//Keumkang/Suwon252” during 2002. “Jojoong” was evaluated as “Iksan360” in advance yield trial test in 2011. It was tested in the regional yield trial test between 2012 and 2014. “Jojoong” is an awned, semi-dwarf and hard winter wheat, similar to “Keumkang” (check cultivar). The heading and maturing date of “Jojoong” were earlier to “Keumkang”. “Jojoong” had lower test weight (799 g/L) and 1,000-grain weigh (35.6g) than “Keumkang” (816 g/L and 45.5g, respectively). “Jojoong” showed resistance to winter hardiness and pre-harvest sprouting, which lower withering rate on the high ridge (10.5%) and rate of pre-harvest sprouting (10.5%) than “Keumkang” (31.7 and 21.4%, respectively). “Jojoong” showed similar protein content (12.5%), SDS-sedimentation volume (43.5ml) and gluten content (8.6%) to “Keumkang” (12.9%, 58.5ml and 8.5%, respectively). It showed higher lightness (93.17) in flour color than “Keumkang” (91.95, respectively). “Jojoong” showed higher lightness (81.50) of noodle dough sheet than “Keumkang” (80.95). “Jojoong” exhibited similar hardness (3.84N) and higher springiness and cohesiveness of cooked noodles (0.94 and 0.66) compared to “Keumkang” (3.88N, 0.90, and 0.62, respectively). Average yield of “Jojoong” in the regional adaptation yield trial test was 5.09 MT/ha in upland and 5.35 MT/ha in paddy field, which was 9% and 8% higher than those of “Keumkang” (4.67 MT/ha and 4.92 MT/ha, respectively).
Role of Methacholine PC20 in FEF25-75% for the Diagnosis of Bronchial Asthma
( Kyeong Min Son ),( Seung Hun Jang ),( Hye Ryun Kang ),( Bo Ram Han ),( Joo Hee Kim ),( Hyun Sung Kim ),( Sung Hoon Park ),( Yong Il Hwang ),( Dong Gyu Kim ),( Ki Suck Jung ) 대한결핵 및 호흡기학회 2009 Tuberculosis and Respiratory Diseases Vol.67 No.4
Background: The methacholine bronchial provocation test is a useful tool for evaluating asthma in patients with normal or near normal baseline lung function. However, the sensitivity of this test is 82∼92% at most. The purpose of this study is to evaluate the clinical usefulness of FEF25-75% in identification of airway hyperresponsiveness in patients with suspected asthmatic symptoms. Methods: One hundred twenty-five patients who experienced cough and wheezing within one week prior to their visiting the clinic were enrolled. Results: Sixty-four subjects showed no significant reduction of FEV1 or FEF25-75% on the methacholine bronchial provocation test (Group I). In 24 patients, FEF25-75% fell more than 20% from baseline without a 20% fall of FEV1 during methacholine challenge (Group II). All patients who had more than 20% fall of FEV1 (n=37) also showed more than 20% of reduction in FEF25-75% (Group III). Baseline FEV1/FVC (%) and FEF25-75% (L) were higher in group II than group III (81.51±1.56% vs. 75.02±1.60%, p<0.001, 3.25±0.21 L vs. 2.45±0.21 L, p=0.013, respectively). Group II had greater reductions of both FEV1 and FEF25-75% than group I at 25 mg/mL of methacholine (p<0.001). The provocative concentration of methacholine causing a 20% fall in FEF25-75% in group II was about three-fold higher than that in group III. Conclusion: A 20% fall of FEF25-75% by methacholine provocation can be more sensitive indicator for detecting a milder form of airway hyperresponsiveness than FEV1 criteria.
Han, Songhee,Hanh Nguyen, Thi Thanh,Hur, Jaewon,Kim, Nahyun M.,Kim, Seong-Bo,Hwang, Kyeong-Hwan,Moon, Young-Hwan,Kang, Choongil,Chung, Byoungsang,Kim, Young-Min,Kim, Tae Sung,Park, Jun-Seong,Kim, Doma Elsevier 2017 Enzyme and microbial technology Vol.103 No.-
<P>Astragalin (kaempferol-3-O-beta-D-glucopyranoside, Ast) is a kind of flavonoid known to have anti-oxidant, anti-HIV, anti-allergic, and anti-inflammatory effects. It has low solubility in water. In this study, novel astragalin galactosides (Ast-Gals) were synthesized using beta-galactosidase from Bacillus circulans and reaction conditions were optimized to increase the conversion yield of astragallin. Purified Ast-Gal1 (11.6% of Ast used, w/w) and Ast-Gal2 (6.7% of Ast used, w/w) were obtained by medium pressure chromatography (MPLC) with silica C-18 column and open column packed with Sephadex LH-20. The structures of Ast-Gal1 and Ast-Gal2 were identified by nuclear magnetic resonance (NMR) to be kaempferol-3-O-beta-D-glucopyranosyl-(1 -> 6)-beta-D-galactopyranoside and kaempferol-3-O-beta-D-glucopyranosyl-(1 -> 6)-beta-D-galactopyranosyl-(1 -> 4)-beta-D-galactopyranoside, respectively. The water solubility of Ast, Ast-Gal1, and Ast-Gal2 were 28.2 +/- 1.2 mg/L, 38,300 +/- 3.5 mg/L, and 38,800 +/- 2.8 mg/L, respectively. The SC50 value (the concentration required to scavenge 50% of the ABTS.+) of Ast, Ast-Gal1, and Ast-Gal2 were 5.1 +/- 1.6 mu M, 6.5 +/- 0.4 mu M, and 4.9 +/- 1.1 mu M, respectively. The IC50 values (the half maximal inhibitory concentration) of Ast, Ast-Gal1, and Ast-Gal2 against angiotensin converting enzyme (ACE) were 171.0 +/- 1.2 mu M, 186.0 mu M, and 139.0 +/- 0.2 mu M, respectively.</P>