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Preparation of Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]O_2 powders for cathode material in secondary battery by solid-state method

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Rare Metals 2006年第Z2期25卷 184-188页

作者： park sook Hee KANG Chan Hyoung Department of Advanced Materials Engineering Korea Polytechnic University Shihung Kyonggi-do 429-793 Korea

Employing Li2CO3, NiO, Co3O4, and MnCO3 powders as starting materials, Li[Ni1/3Co1/3Mn1/3]O2 was synthesized by solid-state reaction method. Various grinding aids were applied during milling in order to optimize the synthesis process. After successive heat treatments at 650 and 950 ℃, the prepared powders were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy, and transmission electron microscopy. The powders prepared by adding salt (NaCl) as grinding aid exhibit a clear R3m layer structure. The powders by other grinding aids like heptane show some impurity peaks in the XRD pattern. The former powders show a uniform particle size distribution of less than 1 μm average size while the latter shows a wide distribution ranging from 1 to 10 μm. Energy dispersive X-ray (EDX) analysiss show that the ratio of Ni, Co, and Mn content in the powder is approximately 1/3, 1/3, and 1/3, respecively. The EDX data indicate no incorporation of sodium or chlorine into the powders. Charge-discharge tests gave an initial discharge capacity of 160 mAh·g-1 for the powders with NaCl addition while 70 mAh·g-1 for the powders with heptane.

关键词： lithium ion battery cathode materials layered structure solid-state method discharge density

Environmental influence in the forested area toward human health: incorporating the ecological environment into art psychotherapy

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Journal of Mountain Science 2020年第4期17卷 992-1000页

作者： Ju-hyoung LEE Ji-sook park Sunnam CHOI Department of Forest Resources and Landscape Architecture Yeungnam UniversityGyeongsan 38541South Korea Department of Art Therapy Yeungnam UniversityGyeongsan 38541South Korea

This study on the development of a psychotherapy program based on the relationship between forests and human health focused on actively considering the natural ecological environment. This study categorized and compared an art psychotherapy program that simply moved to an outdoor space and a forest-art therapy program that actively utilized the forest environment as a medium. The characteristics of the natural environment, such as openness, change, and diversity, shortened the amount of time participants took to develop a rapport and open up and played a vital role in recovering mental health. After a bold attempt at integrating forest environment and art psychotherapy by going beyond outdoor art therapy, there were significant results pertaining to improvements in mental disorders in today’s society, including stress vulnerabilities, depression, anxiety, and aggression. The research results verified that the developed forest-art therapy method had greater efficacy in relation to both the Stress Vulnerability-Interpersonal Sensitivity Scale and the Stress Vulnerability-Self-Regulation Scale.

关键词： Forest therapy Human health Healing forest Art therapy Forest environment

Seroprevalence of Helicobacter pylori in female Vietnamese immigrants to Korea

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World Journal of Gastroenterology 2012年第6期18卷 517-521页

作者： Su Jung Baik Sun Young Yi Hye sook park Bo Hyun park Department of Internal Medicine Ewha Medical Research InstituteSchool of MedicineEwha Womans University911-1 MokdongSeoul 158-710South Korea Department of Preventive Medicine Ewha Medical Research InstituteSchool of MedicineEwha Womans University911-1 MokdongSeoul 158-710South Korea

AIM： To investigate the seroprevalence of Helicobacter pylori （H. pylorl） and its relationship to nutritional fac- tors in female Vietnamese immigrants to Korea. METHODS： A total of 390 female immigrants from Vietnam and 206 Korean male spouses participated in the study. Blood samples from 321 female immigrants and 201 Korean male spouses were analyzed for H. py- Iori antibodies. Data on age, sex, alcohol consumption, smoking status, dietary nutritional factors and gastro- intestinal symptoms were collected using question- naires. The daily intakes of the following nutrients were estimated： energy, protein, niacin, lipid, fiber, calcium, iron, sodium, potassium, zinc, folate, cholesterol, and vitamins A, B1, B2, B6, C and E. RESULTS： The prevalence of H. py/ori positivity was lower in the immigrants than in age-matched Koreanfemales （55.7% vs 71.4%, respectively; P 〈 0.0001） and the domestic population of Vietnam. The preva- lence of H. pylori positivity among married couples was 31.7% for both spouses. There were no statistically sig- nificant differences in the incidence of smoking, amount of alcohol consumed, or nutritional factors between the H. pylori-positive and negative groups. CONCLUSION： The prevalence of H. pylori positivity was lower among female Vietnamese immigrants than among Korean females. Nutritional factors did not differ between the H. pylori-positive and negative groups.

关键词： Vietnam Immigration South Korea Helico-bacter pylori Diet

Precise control of surface oxygen vacancies in ZnO nanoparticles for extremely high acetone sensing response

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Journal of Advanced Ceramics 2022年第5期11卷 769-783页

作者： Jihyun LEE Youngmoon CHOI Byoung Joon park Jeong Woo HAN Hyun-sook LEE Jong Hyeok park Wooyoung LEE Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biological Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea

ZnO has been studied intensely for chemical sensors due to its high sensitivity and fast ***,we present a simple approach to precisely control oxygen vacancy contents to provide significantly enhanced acetone sensing performance of commercial ZnO nanopowders.A combination of H_(2)O_(2)treatment and thermal annealing produces optimal surface defects with oxygen vacancies on the ZnO nanoparticles(NPs).The highest response of~27,562 was achieved for 10 ppm acetone in 0.125 MH_(2)O_(2)treated/annealed ZnO NPs at the optimal working temperature of 400℃,which is significantly higher than that of reported so far in various acetone sensors based on metal oxide semiconductors(MOSs).Furthermore,first-principles calculations indicate that pre-adsorbed O formed on the surface of H_(2)O_(2)treated ZnO NPs can provide favorable adsorption energy,especially for acetone detection,due to strong bidentate bonding between carbonyl C atom of acetone molecules and pre-adsorbed O on the ZnO *** study demonstrates that controlling surface oxygen vacancies by H_(2)O_(2)treatment and re-annealing at optimal temperature is an effective method to improve the sensing properties of commercial MOS materials.

关键词： gas sensors acetone metal oxide semiconductors(MOSs) ZnO nanoparticles(NPs) H_(2)O_(2)treatment

Molecular diagnosis and treatment of drug-resistant hepatitis B virus

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World Journal of Gastroenterology 2014年第19期20卷 5708-5720页

作者： Jeong Han Kim Yong Kwang park Eun-sook park Kyun-Hwan Kim Digestive Disease Center Department of Internal MedicineSchool of MedicineKonkuk UniversitySeoul 143-729South Korea Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine IBSTSchool of MedicineKonkuk UniversitySeoul 143-729South Korea Institute of Functional Genomics Konkuk UniversitySeoul 143-729South Korea

Oral antiviral agents have been developed in the last two decades for the treatment of chronic hepatitis B(CHB).However,antiviral resistance remains an important challenge for long-term CHB *** of the clinically available oral antiviral agents are nucleoside or nucleotide analogues that target the activity of viral reverse transcriptase(RT),and all are reported to have resistant *** the hepatitis B virus(HBV)RT,like other viral polymerases,lacks proofreading activity,the emergence of drug-resistance occurs readily under selective pressure from the administration of antiviral *** molecular diagnosis of drug-resistant HBV is based on sequence variations,and current diagnostic methods include sequencing,restriction fragment polymorphism analysis,and ***,we will discuss the currently available molecular diagnosis tools,in vitro phenotypic assays for validation of drug-resistant HBV,and treatment options for drug-resistant HBV.

关键词： Hepatitis B virus Drug-resistance Molecular diagnosis Antiviral treatment Chronic hepatitis B

Retrieval of Outgoing Longwave Radiation from COMS Narrowband Infrared Imagery

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Advances in Atmospheric Sciences 2015年第3期32卷 375-388页

作者： Myung-sook park Chang-Hoi HO Heeje CHO Yong-Sang CHOI School of Earth and Environmental Sciences Seoul National UniversitySeoul Korea School of Urban and Environmental Engineering Ulsan National Institute of Science & TechnologyUlsan Korea Computational Science and Technology Seoul National UniversitySeoul Korea Computational Science and Technology Seoul National UniversitySeoul Korea Department of Environmental Science and Engineering Ewha Womans UniversitySeoul Korea

Hourly outgoing longwave radiation （OLR） from the geostationary satellite Communication Oceanography Meteorological Satellite （COMS） has been retrieved since June *** COMS OLR retrieval algorithms are based on regression analyses of radiative transfer simulations for spectral functions of COMS infrared *** study documents the accuracies of OLRs for future climate applications by making an intercomparison of four OLRs from one single-channel algorithm （OLR12.0 using the 12.0 μm channel） and three multiple-channel algorithms （OLR10.8＋12.0 using the 10.8 and 12.0 pm channels; OLR6.7＋10.8 using the 6.7 and 10.8 μm channels; and OLRAll using the 6.7,10.8,and 12.0 μm channels）.The COMS OLRs from these algorithms were validated with direct measurements of OLR from a broadband radiometer of the Clouds and Earth＇s Radiant Energy System （CERES） over the full COMS field of view [roughly （50°S-50°N,70°-170°E）] during April *** results show that the root-mean-square errors of COMS OLRs are 5-7 W m-2,which indicates good agreement with CERES OLR over the vast ***6.7＋10.8 and OLRAll have much smaller errors （～ 6 W m-2） than OLR12.0 and OLR10.8＋12.0 （～ 8 W m-2）.Moreover,the small errors of OLR6.7＋10.8 and OLRAll are systematic and can be readily reduced through additional mean bias correction and/or radiance *** results indicate a noteworthy role of the 6.7 μm water vapor absorption channel in improving the accuracy of the *** dependence of the accuracy of COMS OLRs on various surface,atmospheric,and observational conditions is also discussed.

关键词： outgoing longwave radiation Communication Oceanography and Meteorological Satellite Cloud and Earth's Radiant Energy System

Congenital retinal macrovessel with intracranial venous malformation in a pediatric patient: a case report

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International Journal of Ophthalmology(English edition) 2022年第7期15卷 1214-1216页

作者： Hyeon Jin park sook Hyun Yoon sook Young Kim Donghun Lee Department of Ophthalmology Daegu Catholic University School of MedicineDaegu 42472Republic of Korea

Dear Editor,Congenital retinal macrovessel (CRM) is defined as an abnormal large retinal vessel that encircles the foveal avascular zone (FAZ).Since the first description of a large aberrant vessel crossing the macula by Mauthnerin 1868,there have been several case reports about *** recently,Pichi et alreported clinical manifestations and multimodal retinal imaging of 49 eyes with *** their study,they had identified an association between macrovessel in the retina and venous anomalies of the brain and they emphasized the importance of systemic workups including brain magnetic resonance imaging (MRI).

关键词： venous Congenital malformation

Sexual dimorphism and sex-differential migration of Little Buntings(Emberiza pusilla)at an East Asian stopover site

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Avian Research 2022年第1期13卷 87-93页

作者： sook-Young Cho Hyun-Young Nam Se-Young park Chang-Yong Choi Bird Research Center Korea National Park Research InstituteJeonnam58863Republic of Korea Division of Zoology Honam National Institute of Biological ResourcesMokpo58762Republic of Korea School of Biological Sciences College of Natural SciencesSeoul National UniversitySeoul08826Republic of Korea Department of Agriculture Forestry and BioresourcesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul08826Republic of Korea

Sex differences in morphology provide key information for understanding a species'morphological adaptations in relation to the evolution of sexual *** migratory birds,morphological traits have adapted to long-distance travel,and sexual dimorphism is typically related to sex-differential migration *** Buntings(Emberiza pusilla)have one of the longest migrations and are the least dichromatic species among the Emberiza *** this study,we measured sexual size dimorphism and sexual dichromatism of Little Buntings in relation to the spring arrival dates at a stopover site in *** length was the most important predictor for identifying sex;the wings of males were longer than those of *** also had a significantly stronger chestnut color of the head feathers than females,but this color difference was more prominent in the spring than in the *** arrived earlier than females by four *** dates correlated with both size and color,but unlike other bunting species previously studied in the same area,there was no clear sex-differential trend in the relationship between arrival date and morphological *** differences in the degree of sexual dichromatism suggest that chestnut plumage coloration can be used as a social or sexual signal of males in the breeding *** correlation of size and color to early arrival regardless of sex may indicate that a preference for assortative mating exists or that a sex-differential migration strategy is not clearly defined in the early stages of northward *** findings on the sexual dimorphism of Little Buntings provide insight into the evolution of the sex-differential migration of buntings in the East Asian Flyway.

关键词： Digital photography Emberiza pusilla Little Bunting Protandrous migration Sexual dichromatism Sexual dimorphism

Clinical and ABCB11 profiles in Korean infants with progressive familial intrahepatic cholestasis

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World Journal of Gastroenterology 2016年第20期22卷 4901-4907页

作者： Ji sook park Jae Sung Ko Jeong Kee Seo Jin Soo Moon Sung Sup park Department of Pediatrics Seoul National University College of Medicine Department of Pediatrics Gyeongsang National University School of Medicine Department of Laboratory Medicine Seoul National University College of Medicine

AIM: To investigate clinical profiles and mutations of ABCB11 in Koreans with progressive familial intrahepatic cholestasis 2 and review the differences between Koreans and ***: Of 47 patients with neonatal cholestasis, five infants had chronic intrahepatic cholestasis with normal γ-glutamyl transpeptidase. Direct sequencing analyses of ABCB11, including exons and introns, were performed from peripheral ***: Living donor-liver transplantation was performed in four patients because of rapidly progressive hepatic failure and hepatocellular carcinoma. Three missense mutations were found in two patients: compound heterozygous 677C>T(S226L)/3007G>A(G1003R) and heterozygous 2296G>A(G766R). The mutations were located near and in the transmembranous space. CONCLUSION: Alterations in the transmembrane of the bile salt export pump in the Korean infants were different from those previously reported in Chinese, Japanease, Taiwan Residents, and European patients.

关键词： Hepatocellular carcinoma Progressive familial intrahepatic cholestasis ABCB11 Bile salt export pump