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중국(中國) 장백산(長白山)의 메뚜기목(目) 및 바퀴목(目)
백종철 ( Jong Cheol Paik ),S.Yu스토로첸코 ( S. Yu Storozhenko ),렌빈총 ( B. Ren ),정세호 ( S. H. Jung ) 한국토양동물학회 2007 한국토양동물학회지 Vol.12 No.1
A list of 37 species of Orthoptera and 1 species of Blattoptera collected in western and northern slopes of Mt. Changbaishan in 2000-2007 is given. Two species firstly recorded from China and 8 species are new to the fauna of Jilin province.
Yu Peng,He Xue-jun,Ren Ai-di 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
The alongside replenishment scheduling problem with time constraint determining the partition of the ships, the order of replenishment and the allocation of time to the ships at the same time is analyzed. It is equivalent to a multi-stage flow shop scheduling problem with the object of maximizing the effectiveness value of ship fleet. The problem solving process is divided into three steps, and based on the analysis of the three steps, a heuristic algorithm is proposed. The algorithm firstly considers the time allocated to each ship, and then sequences the ships by heuristic rule combining greed with insertion, finally determines the ships partitioning to the port and standard side. Emulating example with different problems’ scale and time constraints shows that the proposed heuristic algorithm is superior to some other algorithms.
Yu-Jie Ren,Fu-Gui Song,Yan-Juan Li,Hong-Qing Zhang 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In the paper, a new mechanization method on the mixed operation of the numerical solutions, analytic solution (if exist), and showing their figures simultaneously for differential equation and their MATLAB programs are presented. With the aid of computer software MATLAB, Euler's method is chosen to illustrate the validity and advantages of the method. As a result, we can not only see the analytic solution, numerical solutions, and their errors but also observe how step size affects the error of the numerical solutions by a figure. The mechanization method can be also applied to other numerical method.
Constructing ZnCo2O4@CTP microspheres as a high-energy lithium storage material
Yu-Rui Ji,Si-Yu Qi,Jian-Cang Wang,Pengfei Wang,Ning Ren,Ting-Feng Yi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Transition metal oxides are deemed as a promising substitute for graphite anode materials of Li-ion batteries(LIBs) on account of their large specific capacity. Nonetheless, the large volume change in the processof charging and discharging leads to low capacity retention. Herein, a well-designed ZnCo2O4@coaltar pitch based porous carbon (ZCO-CTP) microsphere is prepared to construct the high-performanceanode of LIBs. The coating modification of CTP significantly reduces the polarization and charge transferresistance and improves the migration ability of ions and electrons, thus achieving a superior reversiblecapacity and cycling stability of ZCO-CTP anode. The battery with obtained ZCO-CTP5 provides a largecharge capacity of 406.17 mAh/g at 1000 mA g1 compared with pristine ZCO (only 157.78 mAh/g). Even after 1000 cycles at 1000 mA g1, the battery can achieve a charge/discharge capacity of598.46/601.17 mAh/g. We believe that the application of CTP will provide a new perspective for theexploitation of high-performance anode materials for LIBs.
HYPERCYCLICITY OF WEIGHTED COMPOSITION OPERATORS ON THE UNIT BALL OF C^N
Ren-Yu Chen,Ze-Hua Zhou 대한수학회 2011 대한수학회지 Vol.48 No.5
This paper discusses the hypercyclicity of weighted composi-tion operators acting on the space of holomorphic functions on the open unit ball B_N of C^N. Several analytic properties of linear fractional self-maps of B_N are given. According to these properties, a few necessary conditions for a weighted composition operator to be hypercyclic in the space of holomorphic functions are proved. Besides, the hypercyclicity of adjoint of weighted composition operators are studied in this paper.
Ren Chen-Xi,Jin Xin,Xie Dan-Ping,Guo Xiao-Yu,Yu Li-Yun,Cui Yu-Dong,Kwon Taeho,Sun Hu-Nan 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.5
Idiopathic pulmonary fibrosis (IPF) is a serious and irreversible chronic lung disease. Bleomycin (BLM) is an anticancer drug, which can cause severe lung toxicity. The main target of oxidative stress-induced lung injury is alveolar epithelial cells, which lead to interstitial fibrosis. The present study investigated whether hispidin (HP), which has excellent antioxidant activity, attenuates bleomycin-induced pulmonary fibrosis via anti-oxidative effects in A549 cells. We found that hispidin reduced bleomycin-induced fibrosis of A549 cells by reducing reactive oxygen species (ROS) levels and inhibiting epithelial-mesenchymal transition. Taken together, our data suggest that hispidin has therapeutic potential in preventing bleomycin-induced pulmonary fibrosis.
Role of Microstructure on the Shock-Induced Strengthening Behavior of Ti–6Al–4V Alloy
Yu Ren,Jiankun Lin 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The influence of microstructure on the shock-induced strengthening behavior of Ti–6Al–4V (Ti-64) alloy was systematicallyinvestigated through plate impact experiments and quasi-static reload compression tests. Ti-64 displays no enhancedshock-induced strengthening effect at equivalent strain, regardless of the microstructure and shock stress amplitude. However,the shock-induced enhancement ratio is higher in the alloy having the bimodal microstructure with high equiaxed primaryα-phase (P ) volume fraction or the lamellar microstructure with wide α-platelets. The microstructure analyses show thatthe substructures of the postshock Ti-64 with both bimodal and lamellar microstructures are dominated by planar slip. Dislocations are easier to nucleate, move and tangle in those large-sized α phases, such as equiaxedP and wide α-platelet,leading to the formation of reticular substructures and slip bands. However, the dislocation density is relatively low in thesmall α plate of the transformed β regions and in the narrow α-platelet, which is attributed to the relaxation of shock stressand consequently to the suppression of dislocation nucleation caused by the obvious grain/phase boundary damping effect. Only a small number of twins were formed in the lamellar microstructure with wide α-platelet, indicating that grain size andinterface damping also affect the twinning behavior of Ti-64 under shock loading conditions.
Yu-Jie Ren,Yan-Juan Li,Fu-Gui Song,Hong-Qing Zhang 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In the paper, a new compound operation method of the numerical solutions and analytic solution (if exist) is proposed to constructing explicit solutions for nonlinear partial differential equations based on computation system MATLAB. The validity and reliability of the method is tested by its application to the Toda-Lattice equations in (2+1) dimensions. More new explicit solutions are found. The compound operation method can be also applied to other nonlinear partial differential equations.