检索结果-南通市图书馆

Is effect of transcranial direct current stimulation on visuomotor coordination dependent on task difficulty?

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第3期10卷 463-466页

作者： Yong Hyun Kwon kyung woo kang Sung Min Son Na kyung Lee Department of Physical Therapy Yeungnam University College Department of Physical Therapy College of Rehabilitation ScienceDaegu University Department of Physical Therapy College of Health Science Cheongju University

Transcranial direct current stimulation （tDCS）, an emerging technique for non-invasive brain stimulation, is increasingly used to induce changes in cortical excitability and modulate motor behavior, especially for upper limbs. The purpose of this study was to investigate the effects of tDCS of the primary motor cortex on visuomotor coordination based on three levels of task difficulty in healthy subjects. Thirty-eight healthy participants underwent real tDCS or sham tDCS. Using a single-blind, sham-controlled crossover design, tDCS was applied to the primary motor cortex. For real tDCS conditions, tDCS intensity was 1 mA while stimulation was applied for 15 minutes. For the sham tDCS, electrodes were placed in the same position, but the stimu- lator was turned off after 5 seconds. Visuomotor tracking task, consisting of three levels （levels 1, 2, 3） of difficulty with higher level indicating greater difficulty, was performed before and after tDCS application. At level 2, real tDCS of the primary motor cortex improved the accurate index compared to the sham tDCS. However, at levels 1 and 3, the accurate index was not significantly increased after real tDCS compared to the sham tDCS. These findings suggest that tasks of mod- erate difficulty may improve visuomotor coordination in healthy subjects when tDCS is applied compared with easier or more difficult tasks.

关键词： neural regeneration transcranial direct current stimulation visuomotor coordination task difficulty primary motor area motor learning neural regeneration

Effective parameters on diameter of carbon nanotubes by plasma enhanced chemical vapor deposition

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2012年第S3期22卷 712-716页

作者： kang Young JEONG Hyun kyung JUNG Hyung woo LEE National Core Research Center for Hybrid Materials Solution Hybrid Graduate SchoolPusan National University Department of Diagnostic Radiology Inje University College of MedicineHaeundae Paik Hospital

The effective parameters on the diameter of carbon nanotubes (CNTs) by plasma enhanced chemical vapor deposition (PECVD) were *** lots of influential parameters,the effects of the catalytic film thickness and the pretreatment plasma power on the growth of CNTs were *** results show that the size of catalytic islands increases by increasing the thickness of catalytic layer,but the density of CNTs *** pretreatment duration time of 30 s is the optimal condition for growing CNTs with about 50 nm in *** increasing the pretreatment plasma power,the diameter of CNTs decreases ***,the diameter of CNTs does not change drastically from 80 to 120 *** uniformly grown CNTs with the diameter of 50 nm are obtained at the pretreatment plasma power of 100 W.

关键词： carbon nanotubes catalytic film thickness pretreatment plasma power plasma enhanced chemical vapor deposition

Production of high-purity Mg metal from dolomite through novel molten salt electrolysis and vacuum distillation

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第4期11卷 1308-1320页

作者： Hyeong-Jun Jeoung Tae-Hyuk Lee Jin-Young Lee kyung-woo Yi Jungshin kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132Republic of Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113Republic of Korea School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 46241Republic of Korea

In this study,a novel Mg production process for producing high-purity Mg metal from dolomite was *** the electrolysis of calcined dolomite was conducted using Cu cathode and C anode in MgF_(2)–LiF molten salt at 1083–1173 K by applying an average current of 1.42–1.46 A for 9.50–21.0 h,the current efficiency of 66.4–88.6%was *** produced Mg alloys consisted of MgCu_(2)and Cu(Mg)or MgCu_(2)and CuMg_(2)phases,depending on the Mg concentration in the Mg *** the electrolysis of calcined dolomite was conducted in MgF_(2)–LiF–CaF_(2)molten salt at 1083 K,the current efficiency was 40.9–71.4%,owing to undesired reactions such as electroreduction of Ca^(2+)or/and CO_(3)^(2−)***,the current efficiency increased from 40.9%to 63.2%by utilizing a Pt anode,because the occurrence of CO_(3)^(2−)ions in the molten salt was *** vacuum distillation of the obtained Mg alloys at 1300 K for 10 h,Mg metal with a purity of 99.9996–99.9998%was ***,the feasibility of this novel process for the production of high-purity Mg metal from dolomite was demonstrated.

关键词： High-purity magnesium Dolomite Magnesium oxide Electrolytic process Copper metal cathode Vacuum distillation

Beneficial Effect of Berberis amurensis Rupr. on Penile Erection

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2018年第6期24卷 448-454页

作者： Rui Tan Yun Jung Lee kyung woo Cho Dae Gill kang Ho Sub Lee College of Oriental Medicine and Professional Graduate School of Oriental Medicine Wonkwang University Hanbang CardioRenal Syndrome Research Center Wonkwang University Brain Korea 21 Plus Team Professional Graduate School of Oriental MedicineWonkwang University

Objective： To investigate whether the methanol extract of Berberis amurensis Rupr. （BAR） augments penile erection using in vitro and in vivo experiments. Methods： The ex vivo study used corpus cavemosum strips prepared from adult male New Zealand White rabbits. In in vivo studies for intracavernous pressure （ICP）, blood pressure, mean arterial pressure （MAP）, and increase of peak ICP were continuously monitored during electrical stimulation of Sprague-Dawley rats. Results： Preconstricted with phenylephrine （PE） in isolated endothelium- intact rabbit corus cavernosum, BAR relaxed penile smooth muscle in a dose-dependent manner, which was inhibited by pretreatment with NG-nitro-L-arginine methyl ester （L-NAME）, a nitric oxide synthase inhibitor, and 1H-[1,2,4]-oxadiazole-[4,3-α]-quinoxalin-l-one, a soluble guanylyl cclase inhibitor. BAR significantly relaxed penile smooth muscles dose-dependently in ex vivo, and this was inhibited by pretreatment with L-NAME 1H-[1,2,4]- oxadiazole-[4,3-α ]-quinoxalin-l-one. BAR-induced relaxation was significantly attenuated by pretreatment with tetraethylammonium （TEA, P〈0.01）, a nonselective K＋ channel blocker, 4-aminopyridine （4-AP, P〈0.01）, a voltage-dependent K＋ channel blocker, and charybdotoxin （P〈0.01）, a large and intermediate conductance Ca2. sensitive-K＋ channel blocker, respectively. BAR induced an increase in peak ICP, ICP/MAP ratio and area under the curve dose dependently. Conclusion： BAR augments penile erection via the nitric oxide/cyclic guanosine monophosphate system and Ca2. sensitive-K＋（BK＋ and IK＋） channels in the corpus cavemosum.

关键词： penile erection Berberis amurensis Rupr. nitric oxide cyclic guanosine monophosphate K+ channel

Germinant ZnO nanorods as a charge-selective layer in organic solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第20期52卷 89-94页

作者： Kunsik An Jaehoon Kim Mohammad Afsar Uddin Seunghyun Rhee Hyeok Kim kyung-Tae kang Han Young woo Changhee Lee Department of Electrical and Computer Engineering Seoul National UniversitySeoul 08826Republic of Korea Micro/Nano Process Group Korea Institute of Industrial Technology(KITECH)Sangnok-guAnsan-si 15588Republic of Korea Department of Chemistry College of ScienceKorea UniversitySeoul 02841Republic of Korea Department of Electrical Engineering Engineering Research Institute(ERI)Gyeongsang National UniversityJinju 52828Republic of Korea

A facile method was introduced and demonstrated to synthesize zinc oxide(ZnO) nanorods(NRs) as an electron transporting layer(ETL) for organic solar cells(OSCs).Hydrothermal synthesis of the NRs showed a constant growth rate of 5.5 nm min-1 from germination to sub-micrometer *** properties were characterized using scanning electron microscopy(SEM),transmission electron microscopy(TEM),absorption spectrophotometry and so *** on these measurements,the germinant growth mechanism and its corresponding orientation characteristics were *** an ETL of the OSCs,ZnO NRs enhance the charge extraction from the active layer due to their increased interfacial surface area,but there is an optimal length because of the shunt path formation and UV absorption of long ZnO *** a re sult,the OSC with the ZnO NRs as ETL shows power conversion efficiency(PCE) up to 6.2%.The J-V characteristics and incident photon-to-current conversion efficiency(IPCE) measurement also reveal that the efficiency enhancement is an assembly of individual results from optical,physical and electrical characteristic of the ZnO NRs.

关键词： ZnO nanorods Solar cells Self-assembly Oriented growth mechanism Hydrothermal synthesis

Use of various MgO resources for high-purity Mg metal production through molten salt electrolysis and vacuum distillation

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第2期11卷 562-579页

作者： Hyeong-Jun Jeoung Tae-Hyuk Lee Youngjae Kim Jin-Young Lee Young Min Kim Toru HOkabe kyung-woo Yi Jungshin kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132South Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113South Korea Korea Institute of Materials Science 797 Changwondae-roSeongsan-guChangwonGyeongnam 51508South Korea Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 44241South Korea

A green and effective electrolytic process was developed to produce high-purity Mg metal using primary and secondary resources containing Mg O as a feedstock. The electrolysis of various Mg O resources was conducted using a Cu cathode in MgF2– LiF – KCl molten salt at 1043 K by applying an average current of 1.44 A for 12.5 h. The electrolysis of calcined North Korean magnesite and seawater Mg O clinker yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 89.6–92.4%. The electrolysis of oxidized Mg O-C refractory brick, aged ferronickel slag, and ferronickel slag yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 59.3–92.3%. The vacuum distillation of Mg alloys obtained was conducted at 1300 K for 10 h to produce high-purity Mg metal. After vacuum distillation, Mg metal with a purity of above 99.994% was obtained. Therefore, this study demonstrates the feasibility of the production of high-purity Mg metal from various Mg O resources using a novel electrolytic process with a Cu cathode, followed by vacuum distillation.

关键词： High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation

Effect of Isothermal Annealing on Nano Ti-Carbides Precipitation

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 287-289页

作者： Cheol-ho Park woo-jin Kim Nam-hyun kang Hyung-hyup Do kyung-Mox Cho Department of Materials Science and Engineering Pusan National UniversityBusan 609-735Korea Technical Research Laboratories Hyundai steelsDangjinChungnam 343-711Korea

Transmission electron microscopy was used to investigate the effect of isothermal holding temperature and time on the nano Ti-precipitates.A holding temperature was varied systematically from 400℃ to 1200℃.The isothermal holding was continued for 30s,300s and 900s,*** carbides of (Ti,Nb)C were precipitated significantly at 900℃.The size of carbides was approximately 10nm at 30s holding and increased to 20～30nm at 900s *** holding at 1000℃ showed the increased amount of carbides larger than *** 800℃,nano (Ti,Nb)C was not observed at 30s and it was examined at *** size of nano (Ti,Nb)C was smaller than that of 900℃.As the isothermal temperature decreased to 700 ℃,the nano (Ti,Nb)C was only seen at 900s holding and the size of carbides was smaller than *** (Ti,Nb)C was disappeared at isothermal holding below 600℃.The kinetics of nano (Ti,Nb)C precipitation were studied as a function of isothermal holding temperature and time,respectively,using the precipitate growth equations.

关键词： Ti carbide hot rolled steel hole expansion ratio isothermal holding nano precipitates

Ultrasonographic identification of lateral femoral cutaneous nerve anatomical variation in persistent meralgia paresthetica:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第31期11卷 7699-7705页

作者： Hyeong-woo Park kyung-Suk Ji Jun-Hyung Kim Li-Na Kim kang-wook Ha Department of Physical Medicine and Rehabilitation Sahmyook Medical CenterSeoul 02500South Korea Department of Obstetrics and Gynecology Sahmyook Medical CenterSeoul 02500South Korea

BACKGROUND Meralgia paresthetica(MP)is an entrapment mononeuropathy of the lateral femoral cutaneous nerve(LFCN).Although structural abnormalities in nerve tissues can be confirmed using ultrasonography,this is not routinely *** SUMMARY Herein,we present the case of a 52-year-old woman who developed MP after laparoscopic gynecological *** patient was referred to our clinic from an obstetrics and gynecology clinic with symptoms of numbness and a tingling sensation in the left anterolateral thigh,which developed after surgery performed 5 mo *** were performed to assess the disease status and determine the underlying *** examination revealed an anatomical variation,where the left LFCN was entrapped within the inguinal *** case suggests that performing ultrasonographic examination before and after surgery in the lithotomy position could help prevent *** This case demonstrates the value of ultrasonography in detecting anatomical variation and diagnosing persistent *** should be considered an adjunct to electromyography for optimal MP ***,this case would help other clinicians determine patient prognosis and decide on targeted treatment strategies.

关键词： Lateral femoral cutaneous nerve Anatomical variation Meralgia paresthetica Lithotomy position Ultrasonography Case report

Breast adenoid cystic carcinoma arising in microglandular adenosis:A case report and review of literature

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第25期9卷 7579-7587页

作者： Jin kyung An Jeong Joo woo Eun kyung Kim Hee Yong Kwak Department of Radiology Nowon Eulji Medical CenterEulji University School of MedicineSeoul 01830South Korea Department of Pathology Nowon Eulji Medical CenterEulji University School of MedicineSeoul 01830South Korea Department of Surgery Nowon Eulji Medical CenterEulji University School of MedicineSeoul 01830South Korea

BACKGROUND Breast adenoid cystic carcinoma(AdCC)is a rare invasive carcinoma composed of epithelial and myoepithelial *** adenosis(MGA)is a rare benign proliferative lesion consisting of small,uniform,and round glands formed by a single layer of epithelial cells and basement membrane without a myoepithelial cell *** may progress to atypical MGA and carcinoma arising in *** various invasive carcinomas from MGA,AdCC has been rarely ***,we report a case of AdCC arising in *** SUMMARY A 59-year-old woman was diagnosed with a newly developed density on a routine *** density was similar to or slightly lower than that of the breast *** showed an irregular mass with a slightly higher echo than that of *** resonance imaging showed an irregular mass with a similar T1 signal intensity and a slightly higher T2 signal intensity compared to muscles or the breast *** lesion showed heterogeneous internal enhancement with an initially slow and delayed persistent enhancing ***,the tumor was composed of invasive AdCC,in situ AdCC,and *** is composed of basaloid and ductal epithelial cells forming cribriform or solid sheets,or haphazardly scattered small cribriform or tubular *** showed small glands with a single epithelial lining and retained lumen.S-100 staining was strongly positive in MGA *** patient underwent breast-conserving surgery with sentinel lymph node *** Breast AdCC arising in MGA showed unique imaging findings that was different from usual invasive cancer.

关键词： Breast neoplasms Fibrocystic breast disease Carcinoma Adenoid cystic Case report