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Jeon, In-Yup,Kweon, Do Hyung,Kim, Seong-Wook,Shin, Sun-Hee,Im, Yoon Kwang,Yu, Soo-Young,Ju, Myung Jong,Baek, Jong-Beom The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.41
<▼1><P>Triazine-functionalized graphene nanoplatelets were synthesized for use as platinum nanoparticle supports. The Pt/TfGnP catalyst exhibited high electrocatalytic activity with superb stability for both the ORR and IRR.</P></▼1><▼2><P>Platinum (Pt) nanoparticles were stably anchored on triazine-functionalized graphene nanoplatelets (TfGnPs), which were prepared by a two-step reaction starting from carboxylic acid- (CGnPs), acyl chloride- (AcGnPs) and amide-functionalized graphene nanoplatelets (AfGnPs). The resulting Pt nanoparticles on TfGnPs (Pt/TfGnPs) exhibited outstanding electrocatalytic activity with significantly enhanced stability compared with commercial Pt-based catalysts for the oxygen reduction reaction (ORR) in fuel cells (FCs) and the iodine reduction reaction (IRR) in dye-sensitized solar cells (DSSCs). For the ORR in FCs, the onset and half-wave potentials of Pt/TfGnPs under acidic conditions displayed greater positive shifts to 0.58 and 0.53 V, respectively, than those of the commercial Pt/C catalyst (0.57 and 0.52 V). For the IRR in DSSCs, Pt/TfGnPs displayed a reduced charge transfer resistance (<I>R</I>ct) of 0.13 Ω cm<SUP>2</SUP> at the CE/electrolyte interface. This value was much lower than the Pt CE of 0.52 Ω cm<SUP>2</SUP>. More importantly, Pt/TfGnPs exhibited profoundly improved electrochemical stability in both the ORR and IRR compared to the Pt-based catalysts. The combination of extraordinarily high electrocatalytic activity with stability could be attributed to the high specific surface area (963.0 m<SUP>2</SUP> g<SUP>−1</SUP>) and the triazine units of the TfGnPs, respectively, which provided more active sites and stably anchored the Pt nanoparticles.</P></▼2>
소아에서 Takayasu 동맥염을 동반한 뇌동맥류 : 증례 보고 Case Report
전호규,하영수,박종운,김영,채권병,이상돈,김재중 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.3
The authors present a case of intracranial aneurysm with Takayasu's arteritis. A 10-year-old boy was admitted with complaints of sudden bursting headache and vomiting. Computed tomographic(CT) scan showed subarachnoid hemorrhage and measured blood p m sum between in each side did differ significantly. Aortoangiogram showed narrowing of the abdominal aorta and stenosis at their origins of the renal arteries. An angiogram of the right carotid artery revealed a saccular aneutysm located at the proximal portion of the middle cerebral artery. Intracranial aneurysm with Takayasu's arteritis is a rare entity, evenmore in children.
전호규,하영수,박종운,김영,채권병,이상돈,김재중,진태경 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.8
Primitive neuroectodermal tumors(PNETs) are composed of undifferentiated cells resembling germinal matrix cells of the embryonic neural tube. The concept of the primitive neuroectodermal tumors is controversial due to indistinct clinicopathologic entities. While some neuropathologists believe that the PNET concept should be applied to all these tumors with the addition of qualifying terms, the opponents of this approach believe this concept to be too simplistic and that well-established diagnostic entities should not be grouped together as a single entity. Four patients with PNET were reviewed. Although the PNETs bear some differences to posterior fossa medulloblastomas, we should be grouped together as a single pathologic entity because of their primitive nature. The purpose of this study is to review the similarities and differences between two tumors from their histologic and embryologic features.
강권수,전진곤,한희진,박천욱,이철헌 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.7
Shiitake (Lentinus edodes) is nowadays the second most commonly produced edible mushroom in the world. Two patients complained of severe itching and showed widespread disseminated very small erythematous papule and characteristic linear grouped erythematous papules after scratching (Ko¨bner phenomenon). Here we report two cases of mushroom intolerance which developed after ingestion of boiled or cooked shiitake mushrooms. (Korean J Dermatol 2003;41(7) : 974~976)