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Chae, Ji Eon,Kim, Bo Hyun,Noh, Jee Hyun,Jung, Jaewoo,Kim, Jin-Young,Jang, Jong Hyun,Yoo, Sung Jong,Kim, Hyoung-Juhn,Lee, So Young Elsevier 2017 Journal of industrial and engineering chemistry Vol.47 No.-
<P><B>Abstract</B></P> <P>Electrode properties determine the membrane-electrode assembly (MEA) performance of fuel cells and are influenced by the materials and processing. A high-performance electrode requires good adhesion between the membrane and catalyst, excellent gas permeability, and good ion conduction. Here, sulfonated poly(arylene ether sulfone) (SPAES) containing a bulky spirobiindane (Spiro) group is proposed as a new hydrocarbon electrode binder for MEAs. The effect of the Spiro group on MEA performance was compared to that of the common biphenylsulfone. The structural differences between the two binders affected the mass transport region of the current-voltage polarization (related to gas permeation). The spiro-polyethersulfone (PES) had 115 times higher O<SUB>2</SUB> permeability (30 Barrer) than that of PES. From <SUP>1</SUP>H NMR spectra, the degree of sulfonation (DS) of each SPAES was confirmed, where the proton conductivity of Spiro 30, Spiro 20, and BPS 30 were 28.2, 10.1, and 26.9mScm<SUP>−1</SUP>, respectively. In addition, the DS of the electrode binder contributed to the Ohmic region of the i–V curve. The Ohmic resistance of these hydrocarbon binders was similar to that of commercial Nafion binder (0.13–0.15Ωcm<SUP>2</SUP>). However, the charge transfer resistance of our binders was higher than that of Nafion due to insufficient gas permeability and low proton conductivity.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Treatment Result in Advanced T3 and T4 Glottic Carcinoma
Hyun Soo Shin(신현수) , Hyung Sik Lee(이형식) , Eun Ji Chung(정은지) , Gwi Eon Kim(김귀언) , Juhn Kyu Loh(노준규) , Chang Ok Suh(서창옥) , Kwang Moon Kim(김광문) , Won Pyo Hong(홍원표) 대한방사선종양학회 1991 Radiation Oncology Journal Vol.9 No.1
Between January 1980 and September 1988, 68 patients with advanced T3 & T4 glottic carcinoma were treated with RT and surgery/RT in the Department of Radiation Oncology, Yonsei Cancer Center and ENT, Yonsei University College of Medicine. The mean age was 60 years old (range 33 to 79 years old). The 34 patients were treated with irradiation alone, and the remaining 34 patients with surgery and irradiation. Initial nodal presenta-tion was 37% (25/68); 31% (11/34) in RT alone group and 41% (14/34) in combined treatment group. The minimum follow-up was 2 years. The local control rate after treatment was 47% in RT alone group and 65% in combined treatment group; 57% for node negative and 27% for node positive patients treated with RT alone; 65% for node negative and 64% for node positive patients treated with combined treatment. The treatment failure was observed in 30 patients; 14 patients for primary local failure, 6 patients for regional nodal failure, 6 patients for local and regional failure, 26 patients for primary failure and/or distant metastasis, and 2 patient for regional failure and/or distant metastasis. The overall 5-year survival rate was 57%; 37% in RT alone group and 76% in combined treatment group; 55% for node negative and 20% for node positive patients treated with RT alone; 73% for node negative and 77% for node positive patients treated with combined treatment. In conclusion, the combined treatment groups in the treatment of advanced T3 and T4 glottic cancer showed the better results in local control rates and 5-year actuarial survival rates than RT alone group. We suggest that total laryngectomy and postoperative RT in the most patients of advanced glottic cancer were performed. However, in cases of node negative patints, RT alone is prefer as a treatment modality over combined surgery and RT since the treatment results were comparable and furthermore functional preservation could be achieved. 1980년 1월부터 1988년 9월사이에 연세대학병원, 연세암센터 치료방사선과 및 이비인후과에서 치료받았던 68예의 T3, T4병기의 성문암 환자를 대상으로 후향적분석을 하였다. 이 중 34명은 방사선 치료 단독으로 치료하였고 34명은 성문절제술후 방사선치료를 하였으며 이들 환자의 최소 추적기간은 2년이었고 54명(79%)에서 5년 추적조사가 가능하였다. 치료후 국소관해율은 방사선치료 단독군에서는 61%, 수술 및 수술후 방사선치료군에서는 79%이었고 임파절 음성군에서는 72%, 76%였으며 임파절 양성군에서는 31%, 81%이었다. 이들의 치료실패요인은 대부분 국소 국한적이었고 30명(44%)에서 관찰되었다. 치료에 따른 5년 생존율을 방사선치료 단독군에서는 37%, 수술 및 수술후 방사선치료군에서는 76%로서 T3, T5병기의 성문암환자에 있어서 수술시행후 방사선치료를 병용하는 복합요법이 더 좋은 치료결과를 얻을 수 있음을 알았다. 그러나 임파절 음성군에서는 방사선치료 단독군과 수술 및 수술 후 방사선치료군을 비교해 본 결과 5년 생존율이 55%와 73%로 통계학적으로 유의한 차이를 보이지는 않았다. 따라서 본 저자들은 T3, T4 병기의 성문암치료시 수술 및 방사선치료 병용요법이 더 좋은 치료결과를 얻을 수 있지만 임파절 음성군에서는 기능적인 보존측면에서 방사선치료가 일차적 치료방법으로서 효과적이리라 사료된다.
Lim, Ji-Eun,Lee, Uk Jae,Ahn, Sang Hyun,Cho, EunAe,Kim, Hyoung-Juhn,Jang, Jong Hyun,Son, Hyungbin,Kim, Soo-Kil Elsevier 2015 Applied Catalysis B Vol.165 No.-
<P><B>Abstract</B></P> <P>We have investigated phosphate adsorption on the Au surface by in situ electrochemical surface-enhanced Raman spectroscopy to assess the possible use of Au-based alloys as catalysts for the oxygen reduction reaction (ORR) in high-temperature proton exchange membrane fuel cells. Compared with its strong adsorption in neutral or basic electrolytes, the adsorption of phosphate species on the Au surface were significantly altered in acidic electrolyte. Thus, Pt<SUB> <I>x</I> </SUB>Au<SUB> <I>100-x</I> </SUB> catalysts of various compositions were prepared by electrodeposition and exhibited better ORR activities than pure Pt in phosphoric acid electrolyte, which can be explained in terms of alloying effects and the different phosphate adsorption behavior.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phosphate adsorption on Au substrate was investigated by in situ EC-SERS. </LI> <LI> Under acidic condition, Au has strong tolerance to phosphate species adsorption. </LI> <LI> ORR activities of electrodeposited PtAu alloys were tested in the presence of PA. </LI> <LI> PtAu catalysts exhibited better ORR activity than pure Pt in the presence of PA. </LI> </UL> </P>
기립성 단백뇨와 특발성 만성 피로를 동반한 Nutcracker 증후군 1례
전지현,유병원,이재승,김명준,Juhn Ji Hyun,Yoo Byung Won,Lee Jae Seung,Kim Myung Jun 대한소아신장학회 2001 Childhood kidney diseases Vol.5 No.1
Nutcracker증후군은 좌측 신정맥이 대동맥과 상장간막 동맥에 압박되어 발생하는 드문 질환으로 혈뇨, 단백뇨, 기립성 단백뇨의 원인이 된다. 초음파와 도플러 검사로 진단이 가능하다. 저자들은 기립성 단백뇨와 특발성 만성피로를 보인 보기드문 심한 Nutcracker 증후군 환아를 경험하였기에 문헌고찰과 함께 보고하는 바이다. The nutcracker syndrome is the congestion of left renal vein due to the compression of left renal vein by the aorta and the superior mesenteric artery and has been known as tile cause of hematuria with or without left renal flank pain, mild to moderate proteinuria and orthostatic proteinuria. We present here one case of 13.5 year of girl has severe typical nutcracker syndrome with orthostatic protinuria and idiopathic chronic fatigue. (J. Korean Soc Pediatr Nephrol 5 . 64- 8, 2001)
임피던스 복소캐패시턴스법에 의한 PEMFC 전극 구조 분석
장종현(Jang, Jong-Hyun),손지환(Son, Ji-Hwan),김형준(Kim, Hyoung-Juhn),한종희(Han, Jong-Hee),임태훈(Lim, Tae-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
PEMFC의 전기화학적 반응은 촉매, 이오노머, 기공이 만나는 삼상계면에서만 일어나므로, 전극 구조의 최적화가 성능 향상 및 장기안정성 확보에 있어 매우 중요하다. 본 연구에서는 전극 미세구조를 실시간으로 분석하기 위해 임피던스 복소캐패시턴스법을 도입하고자 하였다. 즉, PEMFC의 양극에 질소를 공급하면 0.4 V 부근에서 전기이중층 형성 반응만이 일어나는 것을 확인하였으며, 이때 음극에는 수소를 공급하여 기준전극 및 반대전극으로 사용하였다. 측정된 임피던스를 복소캐패시턴스로 변환하고 허수부를 주파수에 대해 도시하면 피크 형태의 곡선이 얻어지는데, (1) 피크 면적은 전극/전해질의 계면면적, (2) 피크 위치는 이오노머 네트워크에 의한 수소이온 전도 특성, (3) 피크 폭은 다공성 구조의 균일도를 각각 나타내므로, 피팅 없이 직접적인 해석이 가능하다는 장점을 가진다. 반면, 기존의 Nyquist 도시법은 피팅에 의한 분석이 필요하며, 전극층의 불균일한 구조로 인해 단순한 등가회로 구성이 어려운 문제점을 가진다. 최종적으로, MEA 제작 조건 및 운전 조건을 변수로 하여 임피던스를 측정하고 복소캐패시턴스 분석을 수행하여, 퇴화 경로를 규명하고 운전 조건을 최적화하고자 하였다.
Kim, Jong-Hwan,Park, Young-Mi,Shin, Ji-Sun,Park, Seung Jae,Choi, Jung-Hye,Jung, Hyun-Ju,Park, Hee-Juhn,Lee, Kyung-Tae Pharmaceutical Society of Japan 2009 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.32 No.6
<P>Fraxinellone is formed by the natural degradation of limonoids isolated from the root bark of <I>Dictamnus dasycarpus</I>. Fraxinellone has been reported to possess neuroprotective and vasorelaxing activities, but the effects and the mechanism of fraxinellone in inflammation have not been fully characterized. In the present study, the anti-inflammatory effect of fraxinellone was evaluated in lipopolysaccharide (LPS)-treated RAW 264.7 macrophages. Fraxinellone was found to inhibit LPS-induced nitric oxide (NO) and prostaglandin E<SUB>2</SUB> (PGE<SUB>2</SUB>) production, and to reduce the LPS-induced expressions of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) at the mRNA and protein levels in a dose-dependent manner. Furthermore, fraxinellone significantly attenuated LPS-induced DNA binding activity and the transcription activity of nuclear factor-kappa B (NF-κB). Consistent with these findings, pretreatment with fraxinellone significantly suppressed the LPS-stimulated phosphorylation of inhibitory kappa B-α (IκB-α) and the subsequent translocation of p65 to the nucleus. Fraxinellone also suppressed the IκB kinase (IKK) activity and the phosphorylation of extracellular-signal-related kinase (ERK1/2), whereas the phosphorylations of Jun N-terminal kinase (JNK1/2) and p38 were unaffected. These results suggest that the anti-inflammatory properties of fraxinellone are related to the down-regulations of iNOS and COX-2 due to NF-κB inhibition through the negative regulations of IKK and ERK1/2 phosphorylations in RAW 264.7 cells.</P>
Seounghwa Sung,Mayadevi T.S.,Ji Eon Chae,Hyoung-Juhn Kim,Tae-hyun Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Quaternary ammonium-functionalized poly(ether sulfone) (QA-PES) block copolymers with differentblock chain lengths were prepared as anion exchange membranes. Copolymers with similar hydrophilic/hydrophobic block ratios and hence similar IEC values, but with various oligomer block chain lengthswere synthesized to investigate, for thefirst time, how the length of each oligomer included in theblock copolymers affected the chemophysical and electrical properties of the obtained QA-PES anionexchange membranes. The copolymer with the optimal hydrophilic:hydrophobic block chain length(QA-PES-16-30) showed good phase separation. This led to the optimal formation of ionic clusters, andthe highest ion conductivity of 81.01 mS cm 1 at 80 C, as well as excellent physicochemical stability evenafter alkaline treatment in 1 M NaOH at 60 C for 500 h, due to strengthening of the hydrophobic regions,strongly suggesting that the block chain length of each of the hydrophilic and hydrophobic blocks canaffect the physicochemical properties of the polymer membranes. The H2/O2 single cell performanceusing the QA-PES-16-30 membrane showed a maximum power density of 260 mW cm 2, much higherthan that obtained from the Tokuyama A201.