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Song, Yingze,Zhao, Wen,Kong, Long,Zhang, Li,Zhu, Xingyu,Shao, Yuanlong,Ding, Feng,Zhang, Qiang,Sun, Jingyu,Liu, Zhongfan The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.9
<P>Lithium-sulfur (Li-S) batteries are deemed as one of the most promising next-generation energy storage systems. However, their practical application is hindered by existing drawbacks such as poor cycling life and low Coulombic efficiency due to the shuttle effect of lithium polysulfides (LiPSs). We herein present an <I>in situ</I> constructed VO2-VN binary host which combines the merits of ultrafast anchoring (VO2) with electronic conducting (VN) to accomplish smooth immobilization-diffusion-conversion of LiPSs. Such synchronous advantages have effectively alleviated the polysulfide shuttling, promoted the redox kinetics, and hence improved the electrochemical performance of Li-S batteries. As a result, the sulfur cathode based on the VO2-VN/graphene host exhibited an impressive rate capability with ∼1105 and 935 mA h g<SUP>−1</SUP> at 1C and 2C, respectively, and maintained long-term cyclability with a low capacity decay of 0.06% per cycle within 800 cycles at 2C. More remarkably, favorable cyclic stability can be attained with a high sulfur loading (13.2 mg cm<SUP>−2</SUP>). Even at an elevated temperature (50 °C), the cathodes still delivered superior rate capacity. Our work emphasizes the importance of immobilization-diffusion-conversion of LiPSs toward the rational design of high-load and long-life Li-S batteries.</P>
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ON THE GENERALIZED SOR-LIKE METHODS FOR SADDLE POINT PROBLEMS
Feng, Xin-Long,Shao, Long The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.3
In this paper, the generalized SOR-like methods are presented for solving the saddle point problems. Based on the SOR-like methods, we introduce the uncertain parameters and the preconditioned matrixes in the splitting form of the coefficient matrix. The necessary and sufficient conditions for guaranteeing its convergence are derived by giving the restrictions imposed on the parameters. Finally, numerical experiments show that this methods are more effective by choosing the proper values of parameters.
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Long-Feng Wang,Jeevan Prasad Reddy,Jong-Whan Rhim 한국포장학회 2014 한국포장학회지 Vol.20 No.1
Agar-based composite films were prepared with variety of food processing and agricultural processing waste materials in order to screen natural lingo-cellulosic resources for the value-added utilization of the under-utilized materials. The effect of these waste materials (10 wt% based on agar) on mechanical properties, moisture content (MC), water vapor permeability (WVP), water absorption behavior of biocomposite films were investigated. Biocomposite films prepared with various fibers resulted in significant increase or decrease in color and percent transmittance. The MC, WVP, and surface hydrophobicity of biocomposite films increased significantly by incorporation of fibers, while the water uptake ratio and solubility of the film decreased. SEM images of biocomposite film showed better adhesion between the fiber and agar polymer. Among the tested cellulosic waste materials, rice wine waste, onion and garlic fibers were promising for the value-added utilization as a reinforcing material for the preparation of biocomposite food packaging films.
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INTERGALACTIC MEDIUM IN THE ACDM UNIVERSE FROM COSMOLOGICAL SIMULATIONS
FENG LONG-LONG,HE PING,FANG LIZHI,SHU CHI-WANG,ZHANG MENG-PING The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
The temperature (T) and entropy (S) fields of baryonic gas, or intergalactic medium (IGM), in the ACDM cosmology are analyzed using simulation samples produced by a hybrid cosmological hydrodynamic/N-body code based on the weighted essentially non-oscillatory scheme. We demonstrate that, in the nonlinear regime, the dynamical similarity between the IGM and dark matter will be broken in the presence of strong shocks in the IGM. The heating and entropy production by the shocks breaks the IGM into multiple phases. The multiphase and non-Gaussianity of the IGM field would be helpful to account for the high-temperature and high-entropy gas observed in groups and clusters with low-temperature IGM observed by Ly$\alpha$ forest lines and the intermittency observed by the spikes of quasi-stellar object's absorption spectrum.
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ON THE GENERALIZED SOR-LIKE METHODS FOR SADDLE POINT PROBLEMS
Xin-Long Feng,Long Shao 한국전산응용수학회 2010 Journal of applied mathematics & informatics Vol.28 No.3
In this paper, the generalized SOR-like methods are presented for solving the saddle point problems. Based on the SOR-like methods, we introduce the uncertain parameters and the preconditioned matrixes in the splitting form of the coefficient matrix. The necessary and sufficient conditions for guaranteeing its convergence are derived by giving the restrictions imposed on the parameters. Finally, numerical experiments show that this methods are more effective by choosing the proper values of parameters.
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일반논문 : 북간도 한인자치운동의 효시: 간민회의 시말과 그 성격
최봉룡 ( Feng Long Cui ) 한국민족학회 2009 민족학연구 Vol.7 No.-
본 논문은 근대에 한반도로부터 북간도에로 이주·정착한 한인들의 첫 자치사회단체인 간민회의 성립과 해체 과정을 통해 그 성격을 검토하였다. 청나라 말기에 시행된 ``헌정개혁``(1908년)의 배경에서 이루어진 지방자치운동은 북간도 한인사회에서 그들의 법적인 지위를 향상시킬 수 있는 계기를 만들어주었다. 간민교육회는 ``자치``를 목적으로 설립되었지만 당시 중국 지방정부는 중·일 양국의 외교적 마찰을 회피하기 위해 ``자치``를 내세우지 못하게 했다. 때문에 간민교육회는 중국 지방정부 보조기관의 성격을 띠고 있음을 지적했다. 신해혁명 이후, 즉 중화민국 초기에 ``지방자치`` 또는 ``聯省自治``를 표방하는 사회적 분위기 속에서 공화사상은 북간도 한인사회에 크게 확산되었다. 1913년 1월 26일 간민교육회의 바탕위에서 중국 지방정부의 비준을 거쳐 한인들의 자치기관인 간민회가 성립되었다. 필자는 본문에서 당시 중화민국헌법이 제정되지 않은 상황에서 간민회는 기한을 2년으로 하는 ``臨時組織``로 성립되었음을 밝혔고, 또한 간민회가 중국 지방행정의 보조기관의 기능을 담당하면서 북간도지역 한인들의 귀화입적, 토지매입 및 민족교육에서 일으킨 역할을 살펴보았다. 그리고 본문에서 필자는 간민회가 농무계와의 대립과 갈등, 일본인의 사주를 받은 친일세력의 방해 및 지방자치제도의 취소 등 복합적인 원인으로 인하여 해체되었음을 분석했다. 또한 간민회가 해체된 결과로 중국지방정부는 북간도 한인사회를 포섭하고 통제할 수 있는 절호의 기회를 상실했고, 반면에 일제는 조선인민회를 통해 북간도지역 대부분의 한인들을 통제하는 양상이 나타나게 되었음을 지적했다. 당시 간민회의 자치적 성격은 지방자치로서 실질적으로 민족자치라는 성격과 구분되었다. 간민회는 북간도 한인들의 자아존속을 위한 자치운동의 효시로서 그 이후에도 지속적으 로 전개된 한인들의 다양한 형태의 자치운동에 지대한 영향을 일으켰다. The purpose of this article is to examine the process of establishment and disorganization of Kanminhui(墾民會) that was, under the Japanese colonial period, the first autonomous entity of Koreans in North KanDo. I, through this, elucidated the characters of Kanminhui. The local autonomous entity(1908) in constitutional revision at late Ching dynasty paved the way for korean legal basis. Koreans in North KanDo established Kanmin-educational body with intent for their autonomy. But Chinese local government was against the autonomous entity of Koreans to avoid diplomatic conflicts between China and Japan. I, because of this, pointed out the character of Kanmin-educational body as assistant body of Chinese local government. Since Xinhai revolution, republican in social atmosphere that advocating for local autonomous entity at beginning of the republic of china government has been the spread of Koreans in North KanDo. Kanminhui of the autonomous entity of Koreans was established in January 26, 1913. Chinese local government have been ratified by Kanminhui on the basis of Kanmin-educational body. I said in body that Kanminhui has been established as a temporary organization. It is period to 2 years. Because the republic of china has not been enacted the constitution at the time. In addition, I said that Kanminhui in charge of function for assistant body of Chinese local government was naturalization, the land sale and national education of Koreans in North KanDo. I said in body cause that dismantled Kanminhui; confrontation and conflict with agricultural affairs body, interferent of japanese inspired Koreans and cancellation of local government system etc. As a result, Chinese local government has lost the opportunity to control of Koreans in North KanDo. On the other hand, Japan was pointed out that Chosuninminhui has been shown to control of the most of Koreans in North KanDo. Practically speaking, autonomous nature of Kanminhui distinguished autonomous nature of national as local autonomous.
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