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      • Energy storage capabilities of nitrogen-enriched pyropolymer nanoparticles fabricated through rapid pyrolysis

        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>

      • SCISCIESCOPUS

        Hierarchically nanoporous pyropolymer nanofibers for surface-induced sodium-ion storage

        Yoon, Hyeon Ji,Lee, Min Eui,Kim, Na Rae,Yang, Seung Jae,Jin, Hyoung-Joon,Yun, Young Soo Pergamon Press 2017 Electrochimica acta Vol.242 No.-

        <P><B>Abstract</B></P> <P>Surface-driven charge storage materials based on both electrochemical double layer (EDL) formation and pseudocapacitive behavior can deliver high energy and power capabilities with long-lasting cycling performance. On the other hand, the electrochemical performance is strongly dependent on the material properties, requiring sophisticated electrode design with a high active surface area and a large number of redox-active sites. In this study, hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) were fabricated from electrospun polyacrylonitrile nanofibers by simple heating with KOH. The HN-PNFs have a hierarchically nanoporous structure and an exceptionally high specific surface area of 3,950.7m<SUP>2</SUP> g<SUP>−1</SUP> as well as numerous redox-active heteroatoms (C/O and C/N ratio of 10.6 and 16.8, respectively). These unique material properties of HN-PNFs resulted in high reversible Na-ion capacity of ∼292mAhg<SUP>−1</SUP> as well as rapid kinetics and stable cycling performance in the cathodic potential range (1-4.5V vs. Na<SUP>+</SUP>/Na). Furthermore, energy storage devices based on HN-PNFs showed a remarkably high specific energy of ∼258 Wh kg<SUP>−1</SUP> at ∼245Wkg<SUP>−1</SUP> as well as a high specific power of ∼21,500Wkg<SUP>−1</SUP> at ∼78 Wh kg<SUP>−1</SUP>, with long and stable cycling behaviors over 2,000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) were fabricated. </LI> <LI> HN-PNFs have a high specific surface area of ∼3,950m<SUP>2</SUP> g<SUP>−1</SUP> and numerous heteroatoms. </LI> <LI> HN-PNFs exhibit high capacities of ∼292mAhg<SUP>−1</SUP> and great rate/cycling performances. </LI> <LI> High energy (258Whkg<SUP>−1</SUP>) and high power (21,500Wkg<SUP>−1</SUP>) are achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) fabricated from electrospun polyacrylonitrile nanofibers by simple heating with KOH exhibited high electrochemical performance for Na-ion storage.</P> <P>[DISPLAY OMISSION]</P>

      • KCI등재
      • 전격성 제1형 당뇨병 1예

        노동현,김도형,김나래,박종선,이창헌,김미경,최영식 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

        전격성 제1형 당뇨병은 특발성 당뇨병환자에서 임상 경과가 짧고 진단 당시 심각한 대사 합병증을 동반하면서 췌장 효소 수치가 높고 췌도 특이 자가항체가 음성인 새로운 아형으로 알려져 있으며, 일본과 일본 외에서의 유병률에는 차이가 있는 것으로 보인다. 아직 전격성 제1형 당뇨병의 발생 기전은 명확하지 않으며 유전적 감수성이 있는 개체에서 바이러스 감염 등의 환경적인 인자와의 연관성이 가능한 병태생리로 제시되고 있으며 이에 대한 추가적인 연구가 요구된다. 저자들은 케톤산증으로 내원하여 전격성 제1형 당뇨병을 진단받은 증례를 경험하였기에 문헌고찰과 함께 보고 하는 바이다. Some patients with idiopathic type 1 diabetes have a fulminant disorder characterized by the absence of insulitis and of diabetes-related antibodies, a remarkably abrupt onset and high serum pancreatic enzyme concentrations. This is referred to as fulminant type 1 diabetes. A 29-year-old man suffering from abdominal pain, nausea and vomiting consulted to our hospital. Laboratory findings revealed high blood glucose level and the evidence of diabetic ketoacidosis, but the serum HbA1c was normal nevertheless. The low level of plasma C-peptide indicated the loss of endogenous insulin secretion. The patient satisfied the criteria for the diagnosis of fulminant type 1 diabetes. After the patient has been treated with insulin, his symptoms were improved and abnormal laboratory data were normalized. We report this case with a review of the literature

      • KCI등재
      • KCI등재

        신유(腎兪),태계(太谿)의 동충하초(冬蟲夏草) 약침(藥鍼)과 경구(經口) 투여(投與)가 좌측 신장(腎臟) 제거 백서(白鼠)에 대한 신장(腎臟) Aquaporin-2 단백(蛋白) 발현(發現)과 신장기능(腎臟機能)에 미치는 영향(影響)

        김재홍,윤대환,나창수,조명래,윤여충,채우석,Kim, Jae-hong,Yoon, Dae-hwan,Na, Chang-su,Cho, Myung-rae,Yoon, Yeo-choong,Chae, Wu-suk 대한침구의학회 2005 대한침구의학회지 Vol.22 No.1

        Objective : The purpose of this study is to arrange the literature about a acupuncture therapy on the knee rheumatoid arthritis. Methods : We arrange fifty kinds of literature about a acupuncture therapy of knee joint, knee arthritis, Results : Acupucture point at G30, G34, S36, LI11, B4O, G39, G38, LI4 used freaquently for the acupuncture therapy Conclusion : B, G, S, Sp of merdians used frequently for the acupuncture therapy. 동충하초(冬蟲夏草)가 신장(腎臟)기능에 미치는 영향을 실험적으로 규명하고자 부분 신절제술을 시행한 백서(白鼠)에 대하여 동충하초(冬蟲夏草) 경구투여(經口投與)와 신유(腎兪) 태계(太谿)에 약침(藥鍼)을 시행한 후 신장내(腎臟內) aquaporin -2 단백발현과 혈장내 renin, ANP, aldosterone 등의 혈액 학적 변화 및 뇨중 creatinine, Na, K Cl 를 관찰하여 다음과 같은 결과를 얻었다. 1. AQP2단백 발현은 경구투여(經口投與) 1, 3군, 약침(藥鍼) 1군에서 유의한 증가를 나타내었다. 2. 혈장 renin은 경구투여(經口投與) 1, 2, 3군, 약침(藥鍼) 1, 2, 3 군 모두에서 유의한 감소를 나타내었다. 3. 혈장 ANP는 경구투여(經口投與) 1군, 약침(藥鍼 ) 3군에서 유의한 증가를 나타내었다. 4. 혈장 aldosterone은 경구투여(經口投與) 2, 3군, 약침(藥鍼) 2군에서 유의한 감소를 나타내었다. 5. 혈청 triglyceride는 경구투여(經口投與) 2, 3군, 약침(藥鍼) 2, 3군에서 유의한 감소를 나타내었다. 6. 혈청 albumin은 경구투여(經口投與) 2군, 약침(藥鍼) 3군에서 유의한 증가를 나타내었다. 7. 혈청 total protein, BUN은 경구투여(經口投與) 1, 2, 3 군, 약침(藥鍼) 1, 2, 3군 모두에서 유의한 감소를 나타내었다. 8. 혈청 phosphorus는 경구투여(經口投與) 1, 2, 3군, 약침(藥鍼) 1, 2군에서 유의한 감소를 나타내었다. 9. 뇨(尿) creatinine은 경구투여(經口投與) 2군에서 유의한 증가를 나타내었고, 약침(藥鍼)군에서는 유의한 변화가 관찰되지 않았다. 10. 뇨(尿) Na는 경구투여(經口投與 ) 1, 2군, 약침(藥鍼) 1, 2, 3군에서 유의한 증가를 나타내었다. 11. 뇨 K는 경구투여(經口投與) 1, 3군에서 유의한 감소를 나타내었으나, 약침(藥鍼) 3군에서는 유의한 증가를 나타내었다. 12. 뇨 Cl는 경구투여(經口投與) 3군, 약침(藥鍼) 2, 3군에서 유의한 증가를 나타내었다.

      • KCI등재

        Ancient schwannoma in oral cavity: a report of two cases

        Na Rae Kim,Dong Hae Chung,Dae-Song Park,Dong-Woo Kim,Sang-Chil Lee,Sung-Yong Kim,Ho-Yong Lim,Hak-Yeol Yeom,Hyeon-Min Kim 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.6

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        This paper reports two cases of schwannomas arising from the oral cavity. One is an intraoral ancient schwannoma located at the left cheek, which evolved over a period of 13 years. The tumor was a well-demarcated buccal mass, which was located in the left lower first premolar area, with an obliterated the buccal vestibule, leaving the overlying mucosa intact. The second case was a central intraosseous schwannoma located from the left lower 1st molar periapical area to the left 3rd molar periapical area. Pathologically, the first mass was composed of the spindle shaped tumor cells with wavy nuclei beneath the fibroconnective tissue of the gingiva but second case mass was not. Occasional nuclear pleomorphism was observed but mitosis or necrosis was absent. There were Antoni A and B areas along with strong, diffuse staining with the S-100 protein. Ancient schwannomas were diagnosed. Schwannoma is a slow-growing benign tumor, and an ancient schwannoma that shows cellular atypism is a variant of a schwannoma caused by purely degenerative changes. To date, only limited cases of ancient schwannomas in the oral cavity have been reported.

      • Effect of fermented porcine placenta on physical fatigue in mice

        Kim, Hee-Yun,Han, Na-Ra,Kim, Na-Rae,Lee, Mikyung,Kim, Jongbae,Kim, Chang-Ju,Jeong, Hyun-Ja,Kim, Hyung-Min SAGE Publications 2016 Experimental biology and medicine Vol.241 No.17

        <P>The fatigue spreads among the people who live under stressful life and brings about a negative impact on physical function. Here we evaluated the anti-fatigue effects of fermented porcine placenta (FPP) and main constituents, lysine (Lys) and leucine (Leu) with treadmill stress test and forced swimming test (FST) in animal models. The mice were administrated with FPP, Lys, and Leu for 21 days. After treadmill exercise, FPP, Lys, and Leu significantly reduced fatigue-related biochemical parameters, including lactate, lactate dehydrogenase, glucose, creatine kinase, urea nitrogen, cortisol, and pro-inflammatory cytokines, whereas superoxide dismutase activity and glycogen levels were significantly increased by FPP, Lys, and Leu. In the FST, FPP, Lys, and Leu significantly decreased immobility times and up-regulated brain-derived neurotrophic factor expression in brain. Furthermore, FPP, Lys, and Leu significantly decreased production of tumor necrosis factor-kappa B, interleukin (IL)-6, IL-1, and IL-4 through blockade of caspase-1/nuclear factor-B pathway in stimulated splenocytes. In addition, FPP, Lys, and Leu significantly promoted proliferation of splenocytes. In conclusion, these findings suggest the potential of FPP as a novel functional food for the regulation of fatigue.</P>

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