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>

항정신병약물 악성증후군에서 말초신경병증을 보인 환자 1례

서유나,강철중 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

Polyphenols of Rubus coreanum Inhibit Catecholamine Secretion from the Perfused Adrenal Medulla of SHRs

Byung-Sik Yu,Duck-Mi Na,Mi-Young Kang,Dong-Yoon Lim 대한생리학회-대한약리학회 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.6

The present study was attempted to investigate whether polyphenolic compounds isolated from wine, which is brewed from Rubus coreanum Miquel (PCRC), may affect the release of catecholamines (CA) from the isolated perfused adrenal medulla of the spontaneously hypertensive rats (SHRs), and to establish its mechanism of action. PCRC (20∼180Ռg/ml) perfused into an adrenal vein for 90 min relatively dose-dependently inhibited the CA secretory responses to ACh (5.32 mM), high K⁺ (56 mM), DMPP (100ՌM) and McN-A-343 (100ՌM). PCRC itself did not affect basal CA secretion (data not shown). Also, in the presence of PCRC (60Ռg/ml), the CA secretory responses to veratridine (a selective Na⁺ channel activator (10ՌM), Bay-K-8644 (a L-type dihydropyridine Ca²⁺ channel activator, 10ՌM), and cyclopiazonic acid (a cytoplasmic Ca²⁺-ATPase inhibitor, 10ՌM) were significantly reduced, respectively. In the simultaneous presence of PCRC (60Ռg/ml) and L-NAME (an inhibitor of NO synthase, 30ՌM), the inhibitory responses of PCRC on the CA secretion evoked by ACh, high K⁺, DMPP, and Bay-K-8644 were considerably recovered to the extent of the corresponding control secretion compared with that of PCRC-treatment alone. The level of NO released from adrenal medulla after the treatment of PCRC (60Ռg/ml) was greatly elevated compared with the corresponding basal level. Taken together, these results demonstrate that PCRC inhibits the CA secretion from the isolated perfused adrenal medulla of the SHRs evoked by stimulation of cholinergic receptors as well as by direct membrane-depolarization. It seems that this inhibitory effect of PCRC is mediated by blocking the influx of calcium and sodium into the adrenal medullary chromaffin cells of the SHRs as well as by inhibition of Ca²⁺ release from the cytoplasmic calcium store at least partly through the increased NO production due to the activation of NO synthase.

남성화 암쥐의 모리스 수중 미로 수행력 : 성에 따른 공간기억력과 테스토르테론 효과의 차이

신성현,박제민,정우영,박문일,서유나,김성곤,강철중 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5

Objectives : It is widely accepted that gonadal steroids are involved in organization and activation of sexual dimorphism in the brain areas related with spatial leaming. This study aimed to test the following hypothesis : 1) spatial memory is affected by sex, 2) this difference is related with brain differentiation by exposure to testosterone in the neonatal period, and/or 3) the sexual difference of spatial memory is the result of the interaction between organization of sexual dimorphism in the brain and the circulating testosterone after growing up. Methods : Testosterone enanthate 100 ㎍, ('androgenized') orvehicle ('control') was randomly administered to 28 female and 25 male rat pups within 24 hour of birth. The escape latencies (EL) in Morris water maze were measured in 15 and 16 week of age with vehicle ('baseline') and with 10 μmol/kg of testosterone ('with testosterone'), respectively. Each session Consis-ted of 10 trials, and means of the last 5 trials were analyzed. Results : The baseline EL of the males were significantly shorter than females regardless ofneonatal exposure to testosterone. With testosterone, EL of the androgenized females were significantly shorter than control females and comparable to those of males. Conclusion : Neonatal exposure to testosterone in female rats may develop a tesosterone-dependent male-like spatial leaming system.

Mucosa-associated Lymphoid Tissue Lymphoma of the Rectum : A case report

Kang, Yu Na,Kwon, Sun Young,Kim, Sang Pyo,Park, Kwan Kyu,Kwon, Kun Young,Lee, Sang Sook,Park, Kyung Sik,Kwon, Jung Hyeok,Kim, Chul Hyun 대한대장항문학회 2003 Annals of Coloproctolgy Vol.19 No.6

Mechanisms of Cross-protection by Influenza Virus M2-based Vaccines

Yu-Na Lee,Min-Chul Kim,Young-Tae Lee,Yu-Jin Kim,Sang-Moo Kang 대한면역학회 2015 Immune Network Vol.15 No.5

GSK 후원 해외연수지원 기금 연구보고 : Inducible nitric oxide synthase and COX-2 expression in hepatocellular carcinomas with its prognostic significance

( Yu Na Kang ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.2

Background: Nitric oxide (NO) is a short-lived radical that transmits cellular signals. But the role of NO and nitric oxide synthase (NOS) remains controversy in malignant tumors. Recently, the study that iNOS is associated with cyclooxygenase-2 (COX-2) was also reported. Methods: The aim of this study was to examine the inducible NOS (iNOS) and COX-2 expression in hepatocellular carcinomas and to investigate its prognostic relevance. Tissue samples from 286 patients surgically treated for hepatocellular carcinoma were immunohistochemically stained for iNOS and COX-2. Results: The expression of iNOS was correlated with COX-2 expression (p<0.001). iNOS and COX-2 immunoreactivity was observed in the cytoplasm of tumor cells in 183 and 235 patients (63.9% and 82.1%). iNOS expression is correlated with Edmonson-Steiner tumor grade (p=0.017, p=0.025). iNOS expression is correlated with better prognosis in the disease free survival (p=0.026) and overall survival (p=0.037) of hepatocellular carcinomas. The clinicopathologic factors, such as smaller tumor size (p=0.001, p<0.001), single tumor mass (p=0.029, p<0.001), well-differentiated tumor grade (p=0.004, p=0.004), lower T stage (p=0.001, p<0.001), lower TNM stage (p=0.001, p<0.001), and lower BCLC stage (p<0.001, p<0.001), may be better prognostic indicators in the disease free survival and overall survival of hepatocellular carcinomas. Conclusions: The ability of iNOS to predict outcome in hepatocellular carcinoma patients may be independent of other known prognostic factors, providing a new molecular marker with significant potential for clinical utility.

GIS를 활용한 대도시 토지용도별 탄소배출량 분석

강유라(Kang, Yu Ra),강인준(Kang, In Joon),김나영(Kim, Na Young),한기봉(Han, Ki Bong) 대한공간정보학회 2011 한국지형공간정보학회 학술대회 Vol.2011 No.5

인도네시아 레스토랑에 나타난 전통 공간구성요소의 현대적 표현 특성

강유나(Kang, Yu-Na),오혜경(Oh, Hye-Kyung) 한국실내디자인학회 2011 한국실내디자인학회논문집 Vol.20 No.6

The purpose of this study was to investigate the characteristic as to how the Indonesian traditional space is expressed in a contemporary space. As for the study method, We visited 12 Indonesian restaurants in Jakarta from Oct. 16 to Oct. 20, 2010 for a case study. The study result is presented as follows: First, as a factor of facade components, the roof part revealed its identity as a Joglo structure. Walls, windows and doors reflected Indonesian tradition, or were transformed in passive or aggressive ways. Second, as a factor of interior space components, ceilings were predominantly designed by reflecting a structural exposure ceiling or Tumpang Sari as it was or by passively transforming them; Interior walls, windows and doors were transformed in aggressive ways. Third, regarding the factors of interior decoration components, traditional furniture was not used, but instead, furniture with contemporary form and local materials were dominently used, and traditional accessaries were used as they were. Therefore, in the case of designing spatial componentss in Indonesian restaurants located in Jakarta, roofs and ceilings, floors, furniture. and accessaries reflected Indonesian tradition, or were passively transformed, whereas walls, windows, doors, and some ceilings aggressively reflected modernized tradition so that they were formed in harmony with traditional and contemporary styles.

인도네시아 식민시대의 공간양식 특성에 관한 연구

강유나(Kang, Yu-Na),오혜경(Oh, Hye-Kyung) 한국실내디자인학회 2011 한국실내디자인학회논문집 Vol.20 No.3

The purpose of this study is to examine the characteristics of space design appearing in facade and interior composition factors of buildings in the colonial period in Indonesia. Research method is a field study, and subjects of the study is 14 buildings built in the colonial period located in Jakarta. The research result is as follows. First, Facade is divided into C type (colonial style), CA type (colonial style + traditional style), CA type (colonial style + art deco style), and CTA type (colonial style + traditional style + art deco style). Among them, CT type which shows both a colonial style and traditional style accounts for the most. As for Java traditional style mainly shows Joglo roof style and bratticing decoration on top of gates, and the colonial style presents both an Amsterdam canal housing style such as narrow Facade and unusual Gable, and a classical style such as pediment, entablature, and columns. Second, interior space is divided into C type (colonial style), CT type (colonial style + Indonesian traditional style), A type (art deco style), and CA type (colonial style + art deco style). Among them, CT type was also accounted for the most. Selected traditional style is a shape of brallicing decoration on top of gates and a shape of tenon of Joglo housing structure. Colonial style showed classical style such as exposed crossbeams, columns, and pilasters, and as for unique decoration, there are Ancona decoration and Delft tile decoration. On one hand, art deco style used typical art deco factors such as contrast of various materials and complementary color or golden color use as well as zigzag or vertical lines and geometric ornament by combining with colonial style or traditional style. It is expected that such research result will be a practical reference data when Korean construction companies or interior design companies advance Indonesia.