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Influence of potassium pyrophosphate in electrolyte on coated layer of AZ91 Mg alloy formed by plasma electrolytic oxidation

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中国有色金属学会会刊：英文版 2009年第4期19卷 824-828页

作者： Jin-Young CHO Duck-Young hwang Dong-H eon LEE Bongyoung YOO Dong-Hyuk SHIN Department of Metallurgy and Materials Scienc e Hanyang University

The effect of potassium pyrophosphate in the electrolyte on plasma electrolytic oxidation(PEO) process for AZ91 Mg alloy was *** morphologies and chemical compositions of the coating layer on the AZ91 Mg alloy were evaluated and corrosion resistance was also estimated by potentiodynamic polarization *** coating layer on AZ91 Mg alloy coated from the Bath 2 containing 0.03 mol/L of potassium pyrophosphate for 360 s exhibited considerably dense structure and contained 11%-18%(mass fraction) of *** higher content of phosphorous of coating layer coated from Bath 2 could be detected at the bottom of oxide layer,which strongly implied that the phosphorous ion might be concentrated at the barrier *** potential of coating layer of AZ91 Mg alloy increased and corrosion current density decreased with increasing the concentration of potassium *** polarization resistance(Rp) of coating layer of AZ91 Mg alloy coated from Bath 2 was 4.65×107 Ω/cm2,which was higher than that(Rp=3.56×104 Ω/cm2) of the sample coated from electrolyte without potassium *** coating layer coated from Bath 2 containing 0.03 mol/L potassium pyrophosphate exhibited the best corrosion resistance.

关键词： AZ91镁合金合金涂层焦磷酸钾电解氧化等离子体电解质腐蚀电流密度耐腐蚀性

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Effect of vitamin D3 on production of progesterone in porcine granulosa cells by regulation of steroidogenic enzymes

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The Journal of Biomedical Research 2016年第3期30卷 203-208页

作者： So-Hye Hong Jae-eon Lee Hong Sung Kim Young-Jin Jung DaeYoun hwang Jae Ho Lee Seung Yun Yang Seung-Chul Kim Seong-Keun Cho Beum-Soo An Department of Biomaterials Science College of Natural Resources & Life Science Pusan National University Miryang 50463 Korea Department of Obstetrics and Gynecology Biomedical Research Institute Pusan National University School of Medicine Busan 46269 Korea Department of Animal Science College of Natural Resources & Life Science Pusan National UniversityMiryang 50463 Korea

1,25-dihydroxyvitamin D3 （VD3）, an active form of Vitamin D, is photosynthesized in the skin of vertebrates in response to solar ultraviolet B radiation （UV-B）. VD3 deficiency can cause health problems such as immune disease, metabolic disease, and bone disorders. It has also been demonstrated that VD3 is involved in reproductive functions. Female sex hormones such as estrogen and progesterone are biosynthesized mainly in ovarian granulosa cells as the ovarian follicle develops. The functions of sex hormones include regulation of the estrus cycle and puberty as well as maintenance of pregnancy in females. In this study, we isolated granulosa cells from porcine ovaries and cultured them for experiments. To examine the effects of VD3 on ovarian granulosa cells, the mRNA and protein levels of genes were analyzed by Real-time PCR and Western blotting assay. Production of progesterone from granulosa cells was also measured by ELISA assay. As a result, transcriptional and translational regulation of progesterone biosynthesis-related genes in granulosa cells was significantly altered by VD3. Furthermore, progesterone concen- trations in porcine granulosa cell-cultured media decreased in response to VD3. These results show that VD3 was a strong regulator of sex steroid hormone production in porcine granulosa cells, suggesting that vitamin D deficiency may result in inappropriate sexual development of industrial animals and eventually economic loss.

关键词： Vitamin D3 steroidogenesis progesterone granulosa cell pig

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Isolated MicroGrid’s Voltage and Frequency Characteristic with Induction Generator Based Wind Turbine

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Smart Grid and Renewable Energy 2014年第7期5卷 180-192页

作者： Woo-Kyu Chae Hak-Ju Lee Sung-Wook hwang Il-Keun Song Jae-eon Kim Chungbuk National University Chungbuk Korea Research Institute Korea Electric Power Corporation Daejeon-si Korea

To save on the island area's power supply cost and protect the clean environment, the Isolated MicroGrid is being duly considered. Consisting of the Wind Turbine Generator (WT), photovoltaic generator, battery system, back-up diesel generator, etc., Isolated MicroGrid, which usually uses the inverter to maintain voltage and frequency of the system, is very weak in terms of voltage and frequency stability compared to the large-scale electrical power system. If wind turbine generator is applied to this weak power system, it could experience many problems in terms of maintaining its voltage and frequency. In this paper, the measurement result of voltage and frequency is presented for MicroGrid, which consists of the Wind Turbine Generator adopting the induction generator and the battery system. MicroGrid’s voltage waveform distortion and Wind Turbine Generator’s output oscillation problems are analyzed using PSCAD/EMTDC. Based on the analyzed result, the importance of type and capacity choice has been suggested in case the Wind Turbine Generator is applied to the Isolated MicroGrid.

关键词： MicroGrid Wind Turbine Induction Generator Battery Voltage Frequency PSCAD/EMTDC

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Pre-operative factors that can predict neoplastic polypoid lesions of the gallbladder

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World Journal of Gastroenterology 2011年第17期17卷 2216-2222页

作者： Byung Hyo Cha Jin-Hyeok hwang Sang Hyub Lee Jang eon Kim Jai Young Cho Haeryoung Kim So Yeon Kim Department of Internal Medicine Cheju Halla General HospitalCheju-siCheju-do 690-766South Korea Departments of Internal Medicine Seoul National University College of Medicine Seoul National University Bundang Hospital Seongnam-siGeonggi-do 463-707South Korea Department of Surgery Seoul National University College of Medicine Department of Pathology Seoul National University College of Medicine Department of Radiology Seoul National University College of Medicine

AIM:To investigate the preoperative factors that can predict neoplastic polypoid lesions of the gallbladder(PLGs) as well as malignant ***:A retrospective analysis was conducted on the 210 consecutively enrolled patients who underwent cholecystectomy due to a PLG larger than 10 mm,as was determined by preoperative trans-abdominal ultrasonography or endoscopic *** ana-lyzed the medical,laboratory,radiologic data and the pathologic ***:In 210 cases,146 had non-neoplastic polyps(69.5%) and 64 cases were neoplastic polyps(30.5%).An older age(≥ 65 years),the presence of diabetes mellitus(DM) and the size of polyp(≥ 15 mm) were revealed to be independent predictive variables for neoplastic polyps with odd ratios(OR) of 2.27(P = 0.044),2.64(P = 0.021) and 4.94(P < 0.01),*** the neoplastic PLGs,an older age(≥ 65 years),the presence of DM and polyp size(≥ 15 mm) were associated with malignancy with ORs of 4.97(P = 0.005),6.13(P = 0.001) and 20.55(P < 0.001),***:Among patients with PLGs larger than 10 mm in size,higher risk groups such as elderly patients more than 65 years old,those with DM or a large polyp size(≥ 15 mm) should be managed by cholecystectomy.

关键词： Gallbladder Polyp Neoplastic Cholecystectomy Diabetes Pre-operative factors

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