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Yun, Young Soo,Kim, Yu Hyun,Song, Min Yeong,Kim, Na Rae,Ku, Kyojin,An, Ji Su,Kang, Kisuk,Choi, Hyoung Jin,Jin, Hyoung-Joon Elsevier 2016 Journal of Power Sources Vol.331 No.-
<P><B>Abstract</B></P> <P>Nanostructured pyropolymers contain significant amounts of redox-active heteroatoms, have high specific surface areas, and a defective carbon microstructure, indicating good potential for pseudocapacitive charge storage. In this study, nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) are fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>. N-PNs-50 exhibit a nitrogen content of 9.8 wt%, a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>, and an amorphous carbon structure with an I<SUB> <I>D</I> </SUB>/I<SUB> <I>G</I> </SUB> intensity ratio of 0.95. These unique characteristics lead to good electrochemical performances, in which reversible capacities of 660 and 255 mAh g<SUP>−1</SUP> are achieved for Li-ion and Na-ion storage, respectively, with favorable voltage characteristics (<1.5 V for Li-ions and <1.2 V for Na-ions). This study provides a more feasible production method for nitrogen-doped pyropolymers and their practicable electrochemical performances for use as an anode in energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanostructured pyropolymers (N-PNs-50) were fabricated by rapid pyrolysis. </LI> <LI> N-PNs-50 exhibited a nitrogen content of 9.8 wt% and amorphous carbon structure. </LI> <LI> N-PNs-50 exhibited a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>. </LI> <LI> 660 and 255 mAh g<SUP>−1</SUP> were achieved for Li-ion and Na-ion storage, respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) were fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>, showing superior electrochemical performances.</P> <P>[DISPLAY OMISSION]</P>
Ko, You Na,Kang, Yun Chan The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.82
<P>Ultrafine Sb nanocrystals, uniformly distributed in a carbon matrix with a microspherical morphology, were synthesized by one-pot spray pyrolysis. The Sb–carbon composite microspheres exhibited good Na-storage properties with stable cyclability, a capacity retention of 90% over 100 cycles, and good rate performance.</P> <P>Graphic Abstract</P><P>The preparation of Sb–carbon composite microspheres and their electrochemical performance are investigated. Sb nanocrystals embedded in a microspherical carbon matrix exhibited superior Na-storage performances. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc05275g'> </P>
Ko, You Na,Choi, Seung Ho,Kang, Yun Chan American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.10
<P>The electrochemical properties of hollow cobalt oxide and cobalt selenide microspheres are studied for the first time as anode materials for Na-ion batteries. Hollow cobalt oxide microspheres prepared by one-pot spray pyrolysis are transformed into hollow cobalt selenide microspheres by a simple selenization process using hydrogen selenide gas. Ultrafine nanocrystals of Co3O4 microspheres are preserved in the cobalt selenide microspheres selenized at 300 degrees C. The initial discharge capacities for the Co3O4 and Cobalt selenide microspheres selenized at 300 and 400 degrees C are 727, 595, and 586 mA h g(-1), respectively, at a current density of 500 mA g(-1). The discharge capacities after 40 cycles for the same samples are 348, 467, and 251 mA h g(-1), respectively, and their capacity retentions measured from the second cycle onward are 66, 91, and 50%; respectively. The hollow cobalt selenide microspheres have better rate performances than the hollow cobalt oxide microspheres.</P>
피질하 혈관성 치매 환자에서 협착성 뇌혈관 병변의 의의 : 자기공명 혈관조영술과 양전자방출단층촬영을 이용한 연구 MR Angiography and ^(18)FDG-PET Study
유경호,이병철,마효일,김윤중,정지향,나덕렬,강연욱 대한치매학회 2004 Dementia and Neurocognitive Disorders Vol.3 No.1
Background and Objective:Subcortical vascular dementia (SVD) incorporates small vessel disease as the primary vascular etiology, represents in MRI by lacunar infarct and deep white matter lesions. In clinical practice, a number of SVD patients present with various vascular risk factors for large artery disease (LAD) i.e., old age, hypertension, and diabetes. However the current diagnostic criteria for SVD did not include angiographic findings as a key feature. Therefore we tried to find out the frequency of large artery disease in SVD and to elucidate whether the presence of LAD affects clinico-radiological manifestations of SVD. Methods:Thirty three patients fulfilling 'Research criteria for SVD' by Erkinjuntti from 17 study centers were recruited. Of these 33 patients, 21 who underwent comprehensive neuropsychological test battery, MRI ^(18)FDG-PET, and MR angiography were classified into two subgroups according to the patterns of MRI abnormality:white matter dominant (WM) type (n=5) and multiple lacunar (LC) type (n=16). Clinical and neuropsychological profile and ^(18)FDG-PET findings of 21 SVD patients with and without LAD were compared. Results: Twelve (57%) of 21 SVD patients had mild stenotic lesions in intracranial large arteries:4 in middle cerebral artery, 8 in posterior cerebral artery, and 4 in vertebrobasilarj artery. There were no differences in vascular risk factors, characteristics of cognitive dysfunctions, and ^(18)FDG-PET findings between SVD with and without LAD. Conclusions:Our results showed that the presence of mild degree of large artery stenosis did not affect the clinical., neuropsychological profile and cerebral metabolism in PET. Therefore, the current 'Research criteria for SVaD' by Erkinjuntti could be used to diagnose SVD as a homogenous clinical group regardless of angiographic abnormalities.
S-413 Giant functioning parathyroid cyst presenting with exertional dyspnea and mild dysphagia
( Na Yun Kang ),( Min Woo An ),( Hyun Kwon Ju ),( Ju Hwan Oh ),( Ki Hoi Kim ),( Ji Hye Kim ),( Sun Kyung Song ),( Cho-ok Baek ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background: The differential diagnosis of cystic cervical masses includes thyroid cyst, thymic cyst, thyroglossal duct cyst, branchial cleft cyst, bronchogenic cyst, lymphangioma, and parathyroid cyst (PC). PC is one of the less common causes of cervical masses. Large PCs can manifest with compressive symptoms of the surrounding tissues. Functioning parathyroid cysts are a rare cause of primary hyperparathyroidism and are often mistaken for thyroid cysts. We report a case where a functioning parathyroid cyst presented as a mediastinal mass to emphasize the potential pitfalls associated with their diagnosis and management.?Case: A 59-year-old male patient visited our clinic for an assessment of dyspnea on exertion and mild dysphagia, symptoms that had begun 6 months prior. Chest computed tomography and neck ultrasound scanning revealed a large mediastinal cystic mass of approximately 10.8 × 5.1 cm in size, located inferior to the left thyroid lobe, causing right-lateral displacement of the large vessels, trachea, and esophagus. We performed fine needle aspiration for the cystic mass, wherein we aspirated approximately 100 cc of fluid with the appearance of old blood and tiny crystals. We also measured the parathyroid hormone (PTH) level of the aspirated fluid to be >5000 pg/mL, suggesting that the fluid originated from the parathyroid gland. The patient presented with primary hyperparathyroidism and elevated levels of calcium and PTH. He subsequently underwent successful parathyroidectomy without any postoperative morbidity, which resulted in complete clinical resolution of the presenting symptoms.?Conclusions: The present study reported the case of a man with a giant functional PC extending from the lower neck to the superior mediastinum. Fine needle aspiration and the detection of increased levels of PTH or thyroglobulin in the fluid of the cyst is a valuable diagnostic tool to confirm cystic neck lesions. Functional hyperparathyroidism should always be considered when parathyroid cyst is confirmed, with surgical excision being the treatment of choice in functioning giant PC.
Kang, Chan Woo,Jang, Kang Won,Sohn, Jinyoung,Kim, Sung-Moo,Pyo, Kyoung-Ho,Kim, Hwan,Yun, Mi Ran,Kang, Han Na,Kim, Hye Ryun,Lim, Sun Min,Moon, Yong Wha,Paik, Soonmyung,Kim, Dae Joon,Kim, Joo Hang,Cho, American Association for Cancer Research 2015 Molecular Cancer Therapeutics Vol.14 No.10
<P><I>RET</I> rearrangement is a newly identified oncogenic mutation in lung adenocarcinoma (LADC). Activity of dovitinib (TKI258), a potent inhibitor of FGFR, VEGFR, and PDGFR, in <I>RET</I>-rearranged LADC has not been reported. The aims of the study are to explore antitumor effects and mechanisms of acquired resistance of dovitinib in <I>RET</I>-rearranged LADC. Using structural modeling and <I>in vitro</I> analysis, we demonstrated that dovitinib induced cell-cycle arrest at G<SUB>0</SUB>–G<SUB>1</SUB> phase and apoptosis by selective inhibition of RET kinase activity and ERK1/2 signaling in <I>RET</I>-rearranged LC-2/ad cells. Strong antitumor effect of dovitinib was observed in an LC-2/ad tumor xenograft model. To identify the acquired resistance mechanisms to dovitinib, LC-2/ad cells were exposed to increasing concentrations of dovitinib to generate LC-2/ad DR cells. Gene-set enrichment analysis of gene expression and phosphor-kinase revealed that Src, a central gene in focal adhesion, was activated in LC-2/ad DR cells. Saracatinib, an src kinase inhibitor, suppressed ERK1/2 phosphorylation and growth of LC-2/ad DR cells. Taken together, these findings suggest that dovitinib can be a potential therapeutic option for <I>RET</I>-rearranged LADC, in which acquired resistance to dovitinib can be overcome by targeting Src. <I>Mol Cancer Ther; 14(10); 2238–48. ©2015 AACR</I>.</P>