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Cho, Won-Je,Yeom, Chul-Gi,Ko, Jang-Myoun,Lee, Yong-Min,Kim, Sang-Hern,Kim, Kwang-Man,Yu, Kook-Hyun The Korean Electrochemical Society 2011 Journal of electrochemical science and technology Vol.2 No.2
To examine the effects of a two-cation ionic liquid as an electrolyte component of a supercapacitor, 1,4-bis(3-methylimidazolium-1-yl)butane tetrafluoroborate ($MIBBF_4$), dissolved in propylene carbonate (PC) or acetonitrile (ACN), is newly synthesized and tested here for potential use as an electrolyte of capacitor. The $MIBBF_4$ salt exhibits higher ionic conductivity in ACN than in PC. The supercapacitive properties of capacitors containing an activated carbon electrode and various electrolytes are evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The capacitor adopting the $MIBBF_4$/ACN electrolyte shows the largest specific capacitance at low scan rates, whereas the capacitor adopting the 1-ethyl-3-methylimidazolium tetrafluoroborate $(EMIBF_4)$/ACN electrolyte shows the largest specific capacitance at high scan rates.
( Jun Sang Ahn ),( Jung Suh Shin ),( Min Ji Kim ),( Gi Hwal Son ),( Eung Gi Kwon ),( Jae Yoon Shim ),( Il Young Kim ),( Sung Myoun Cho ),( Sang Rae Cho ),( Byung Ki Park ) 한국축산학회(구 한국동물자원과학회) 2019 한국축산학회지 Vol.61 No.3
This study aimed to investigate the effects of temperature and retention time of the pressurized steam chamber on the ruminal fermentation characteristics and nutrient degradability of corn flakes in three Korean native Hanwoo cows and three Holstein cows implanted with a ruminal fistula. Corn kernels were categorized into 13 groups based on the chamber temperature (range, 100°C-116°C) and retention time (range, 700-950 s). The pH value was lowest in T1 regardless of breed. Propionate concentration was the highest in T2 (p < 0.05). Total-volatile fatty acid (VFA) concentration was slightly but not significantly greater in T2 than in other conditions. Dry matter (p < 0.05), starch, and crude protein (p < 0.05) degradability were the highest in T1. At different incubation times and with different breeds, dry matter, starch, and crude protein degradability of corn flakes were the highest in T1. Thus, the present results indicate that the optimal temperature and retention time of the pressurized steam chamber should be 100°C-105°C and 700-720 s.
이면재(Lee, Myoun-Jae),조성현(Cho, Sung-Hyun) 한국게임학회 2007 한국게임학회 논문지 Vol.7 No.2
스무딩(Smoothing)은 가변 비트율로 저장된 비디오 데이터를 고정 비트율로 변환하는 전송 계획이다. 이러한 스무딩 알고리즘들에는 CBA, MCBA, MVBA 알고리즘 등이 있다. 그러나 이 알고리즘들에서는 서버에서 제공할 수 있는 여분의 대역폭의 크기를 고려하지 않아서 서버에서 비디오 데이터를 보다 많은 클라이언트들에게 제공하는 것을 어렵게 할 수 있다. 본 논문에서는 제한된 네트워크 대역폭을 갖는 동영상 서버에서 보다 많은 클라이언트들에게 비디오 데이터를 제공할 수 있게 하기 위하여 전송률 감소량(증가량)이 최대(최소)로 하는 스무딩 알고리즘을 제안한다. 제안 알고리즘의 성능을 평가하기 위하여 여러 가지 평가 요소를 사용하였으며, 제안 알고리즘은 기존의 다른 알고리즘들과 비교하여 최대 클라이언트 서비스 개수, 평균 클라이언트 서비스 개수 등과 같은 평가 요소에서 우수함을 보였다. Smoothing is a transmission plan where variable rate video data is converted to a constant bit rate stream. Among them are CBA, MCBA, MVBA and others. However, these smoothing algorithms produce a transmission plan where extra bandwidth in server is not considered. This may cause difficulty in providing videos to many clients in a server. In this paper, we propose the smoothing algorithm with monotonic transmission rate increase and abrupt transmission rate decrease, in order to provide videos to as many clients in server with limited network bandwidth as possible. In order to show the performance of our proposed algorithm, various evaluation factors were used such as the maximum number of clients, the average number of clients, and so on. Experiments demonstrated that the proposed algorithm outperformed other algorithms in evaluation factors such as the maximum number of clients and the average number of clients.
( Alfredmadzamuse ),( Jang Myoun Ko ),( Sang Hern Kim ),( Hyun Woo Cho ),( Yong Min Lee ),( Kwang Man Kim ),( Jong Huy Kim ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Flexible sheets consisting of acrylonitrile-butadiene rubber (NBR) and vapor-grown carbon fiber (VGCF) are newly prepared varying the composition (VGCF 20-30 wt.%) for use as a current collector of supercapacitor electrodes. The as-prepared VGCF/NBR is then electrodeposited by aniline using a potentiodynamic cyclic voltammetry to yield a polyaniline (PANI)/VGCF/NBR composite electrode. It is confirmed that the electrical conductivity of VGCF/NBR current collector can be enhanced as the content of VGCF increases. Cyclic voltammetry result for the PANI/VGCF/NBR composites shows that the sample with 30 wt.% VGCF achieves a maximum specific capacitance (271.8 F g-1) at 5 mV s-1 and also reaches a superior specific capacitance at high scan rates. Such supercapacitor performance is possibly originated from the synergistic effect consisting of higher polarity of nitrile groups in NBR, conducting pathway of VGCF, and electroactive property of PANI.
Lee, Kwang Se,Kim, Sang Jun,Park, Chan Woo,Cho, Incheol,Kim, Patrick Joo Hyun,Pol, Vilas G.,Park, Inkyu,Ko, Jang Myoun Elsevier 2019 Journal of industrial and engineering chemistry Vol.78 No.-
<P><B>Abstract</B></P> <P>A novel approach of preparing high performance electrodes for supercapacitors was demonstrated by pyrolyzing the hierarchical composite prepared from organic waste and biological resources. Sponge waste was utilized as a carbon source for preparing the interconnected structured electrode materials with high porosity, and needle-like ZnO particles were directly grown on the sponge in order to effectively capture bacteria cells as well as improve the overall redox reactions. The bacteria (<I>E. coli</I> O157:H7) were isolated on a ZnO/sponge composite to endow electrochemically beneficial inherent nitrogen existing in bacteria, as well as to provide bio-templates with the aids of these structural and material benefits, the carbonized material prepared from the bacteria loaded on the ZnO/sponge composite showed a significantly enhanced specific capacitance of 133Fg<SUP>−1</SUP> (at 0.2Ag<SUP>−1</SUP>) and an excellent cycle retention of 89% over long-term cycles (5000 cycles). Our strategy of utilizing recyclable and biomass-derived materials not only can effectively improve the electrochemical performances of supercapacitors but also open an innovative way to address the systemic issues underlying the carbonaceous materials used in supercapacitors.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Hwan Lim ),( Jun Sang Ahn ),( Min Ji Kim ),( Gi Hwal Son ),( Joong Kook Park ),( Jae Yoon Shim ),( Il Young Kim ),( Ji Hyung Kim ),( Sung Myoun Cho ),( Eung Gi Kwon ),( Jong Suh Shin ),( Byung Ki Pa 한국축산학회(구 한국동물자원과학회) 2018 한국축산학회지 Vol.60 No.12
Background: Recently, as production costs have been increasing owing to rising feed prices worldwide, shortening the age of slaughter has been recognized as a way to increase farm income. In Korea, the raising period for Hanwoo steers is over 31 months with the delay of weaning and castration stated as one of the reasons for the increase in the raising period. Thus far, studies on age of weaning and castration have been conducted individually, and there have been no studies on the combined effects of weaning and castration ages on the growth performance and carcass characteristics in Hanwoo steers. Methods: Weaning ages were calculated at 80 or 130 days of age, and castration ages were calculated at 90 days and 180 days of age. Calves were allocated to one of the four treatment groups: W80C90 (weaning at 80 days of age and castration at 90 days of age), W80C180, W130C90, and W130C180. Results: For the entire experimental period, weaning and castration ages did not significantly affect growth performance of Hanwoo steers. In addition, weaning and castration ages did not affect the overall yield and quality traits of carcass in Hanwoo steers. Conclusion: Weaning and castration ages had small effects on growth performance and carcass characteristics in Hanwoo steers. Therefore, the early weaning and castration ages are recommended to reduce the slaughter age without any negative effects on meat quality grade.
Lithium modified silica as electrolyte additive for lithium secondary batteries
Latifatu, Mohammed,Hu, Mengyang,Kim, Sang Jun,Bon, Chris Yeajoon,Kang, Chiwon,Cho, Won Il,Ko, Jang Myoun Elsevier 2018 Solid state ionics Vol.319 No.-
<P><B>Abstract</B></P> <P>Lithium sulfonyl silica (LSS) was synthesized by replacing the surface H group in fumed silica with (CH<SUB>2</SUB>)<SUB>3</SUB>SO<SUB>3</SUB>Li and adopted as electrolyte additive for lithium ion battery. 3 wt% of the synthesized particles in 1 M LiPF<SUB>6</SUB> (EC/DMC = 1:1) showed improved ionic conductivity and better potential stability over the pristine electrolyte. The discharge capacity of the LiCoO<SUB>2</SUB>/graphite is particularly enhanced with the addition of LSS at higher C-rates due to the enhanced ionic conductivity at room temperature. The LiCoO<SUB>2</SUB>/graphite cells using 1.0 M LiPF<SUB>6</SUB>/EC/DMC (1: 1) and 1.0 M LiTFSI/EC/DMC (1: 1) with LSS also showed superior performance for the self-discharge test carried out at 45 °C for 200 days. These positive impacts of LSS on LiCoO<SUB>2</SUB>/graphite cells warrant its use in lithium ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lithium sulfonyl silica (LSS) was synthesized and used as an electrolyte additive in Li-ion Battery. </LI> <LI> The discharge capacity of the LiCoO<SUB>2</SUB>/graphite is enhanced at higher C-rates. </LI> <LI> The Li-ion cells with the LSS showed superior performance at higher temperature. </LI> </UL> </P>
Shin Kuk Hyun,Lee Eun Bang,Kim Jea Hyun,Chung Myoun Sook,Cho Sung Ik 한국양록협회 1989 양록회보 Vol.8 No.-
Systematic pharmacological studies on powdered whole part of unossified antler obtained from Cervus nippon var. mantchuricus have been carried out in mice and rats. Powdered antler, with a single oral administration, showed a very weak acute and subacute