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KMT-2017-BLG-0165Lb: A Super-Neptune-mass Planet Orbiting a Sun-like Host Star
Kil Jung, Youn,Gould, Andrew,Zang, Weicheng,Hwang, Kyu-Ha,Ryu, Yoon-Hyun,Han, Cheongho,Yee, Jennifer C.,Albrow, Michael D.,Chung, Sun-Ju,Shin, In-Gu,Shvartzvald, Yossi,Zhu, Wei,Cha, Sang-Mok,Kim, Dong American Astronomical Society 2019 The Astronomical journal Vol.157 No.2
A Study on Canadian-Sino Trade and Investment
Sun Zhong Wei(Zhong Wei Sun) 한국캐나다학회 2007 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.13 No.1
Foreign trade and FDI(foreign direct investment) are the two routes to take part in the world economy competition and cooperation. This paper researches mainly on Canada’s foreign trade with China and Canada’s FDI in China. After reviewing China and Canada’s foreign trade and investment respectively, this paper concentrates on Canadian-Sino trade and Canada’s FDI in China. Under rapid growth of Canadian-Sino trade, the goods structure has changed along with China’s industrialization and development. This provides Canada a big opportunity and Challenge at the same time. At the back of soaring increase of Canada’s FDI in China, this paper does further research on the relation between Canada’s FDI in China and Canadian-Sino trade. By empirical analysis, the conclusion is paradox that the increase of Canada’s FDI in China leads to the decrease of the bilateral trade. Based on theory of OLI, this paper analyzes the reason that the fields of Canadian-Sino trade are different to the fields which Canada invested in China, and at the same time, explain the paradox well. This paper also predicts the future of Canadian-Sino trade and investment and gives some advices to Canada. At the end of this paper, some conclusions are drawn.
An Analyzing Method of Coupled Modes in Multi-Stage Planetary Gear System
Wei Sun,Jing Wei,Xin Ding,Xinglong Hu,Qingguo Wang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This paper analyzed the natural frequency and coupled mode characteristics in multi-stage planetary gear system. A dynamic modelof multi-stage planetary gears with general description is established based on the lumped mass method. Solving the associatedeigenvalue problem, the vibration modes of the system with identical, equally spaced planets are classified into rotational,translational and planet modes with unique properties. A criterion to distinguish the dominant vibration stage for the two coupledmode types, rotational mode and translational mode, are provided by comparing the eigensensitivity to the component parametersof different planetary stages. Taken the dominant vibration stage as an independent single-stage planetary gear system, the naturalfrequencies and vibration modes are observed to be similar to the multi-stage. It is shown that the coupling in the multi-stageplanetary gear system grows as the frequency reduces. In rotational modes and translational modes, the highest eigensensitivity tomesh stiffness and planet bearing stiffness of each stage are associated with different frequencies in the higher-frequency range, whilethe highest eigensensitivity to bearing stiffness of carriers, rings, and suns occurred in the lower-frequency range.
A Study on Rotor Profiles Design for a Novel Twinscrew Kneader
Jing Wei,Qingchao Sun,Xujian Sun,Wei Sun 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The profile curve design method and the mathematical model of conjugate surfaces of twin-screw kneader used for high viscosity material mixing, transportation and malaxating are established according to the principle of gear engagement. A novel twin-screw kneader and the equations of the profile curves of the rotors as well as the rotor design are proposed. The working principles of the twin screw kneader are analyzed and numerical simulations for dynamic characteristics of the flow field are carried out Threedimensional,isothermal and steady state numerical analysis of a non-Newtonian fluid are presented, based on computational fluid dynamics (CFD) theory, and the characteristics under the conditions of different speeds and center distances are studied, such as pressure distributions, velocity fields, the maximum shear stresses and the mass flow rates. The results provide a theoretical basis for performance predictions and reasonable design for the novel twin-screw kneader.
Evaluation of Airport Capacity through Agent Based Simulation
Yang Peng,Gao Wei,Sun Junqing,Sun Bin 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.6
The operational capacity of an airport must be dimensioned under a long-term strategic view as its productivity is determined by available infrastructure. To predict the airport capacity and satisfy the domestic airport property, the operation procedure of airport is analyzed from the point of Multi-agent system. The proposed agent based architecture is a microscopic model of aircrafts' movement; each aircraft is represented as an agent capable of getting its routing results from instructing agent, and makes its own deconflicition decisions on the basis of a part of the observable scene local to that aircraft. An example of airport capacity evaluation is given, and the result is verified through comparison with SIMMOD. Finally, further research is applied to analysis the reason for delay.
A study on load-sharing structure of multi-stage planetary transmission system
Wei Sun,Xiang Liu,Jing Wei,Aiqiang Zhang,Xin Ding,Xinglong Hu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Unequal load distribution is a crucial factor in decreasing bearing capacity and stability of the planetary transmission system. In thispaper, a dynamical model of two-stage helical planetary gear transmission system is established based on lumped-parameter method andLagrange general function. Nonlinearity of gear tooth backlash and error is taken into account. Four load-sharing structures are proposedto study the load-sharing performance. A method to calculate dynamic sensitivity of load-sharing coefficient to errors is presented thatcan provide a reference to component precision determination in order to make planetary system have a better load distribution. Finally, anumerical method of load-sharing performance is validated by a test. These results provide fundamental basis for multi-stage planetarygear transmission system design.
ADRVis : an Information Visualization Platform for Adverse Drug Reactions
Wei Jian-Xiang,Zhu Yun-Xia,Sun Jun,Xu Hou-Ming,Li Ming,Sun Yue-Hong 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.10
Adverse drug reactions (ADRs) are a serious threat to people's lives and property safety. Currently, drug instructions are the main way for people to obtain information on ADRs. Due to drugs’ limited pre-market clinical trials, adverse reactionsstated in drug instructions are often not sufficient. Avisualization platform for ADRs isput forward to address this problem. Adverse drug events (ADEs) data include actual clinical adverse reactions of drugs detected by drug monitoring administrationand can compensate for the insufficiency of drug instructions. Based on drug instructions and ADEs data, ADRVis isrealized by data analysis, model design and JAVA programming. ADRVis presentsthe relationship of 656 common drugs and their respective ADRs. Three case studies show that the platform has the capacities of visual presentation of ADRs and early warning of drug risks.The platform can provide people more rich information about drugs and help them understand ADRs more accurately and comprehensively.
Identification of mechanical parameters of hard-coating materials with strain-dependence
Wei Sun,Hui Li,Qingkai Han 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
When analyzing the dynamics of the hard-coating composite structure, it is necessary to determine the mechanical parameters (includingYoung’s modulus and loss factor) of the coating material through experiment. We derived an identification formula for extracting themechanical parameters of small damping materials with consideration of the loss factor of metal substrate. Based on the identificationformula, a practical methodology and relative test procedure for estimating mechanical parameters of hard-coating materials with straindependencewere proposed. Then, a common hard-coating material NiCrAlY was taken as study case and its strain-dependence Young’smodulus and loss factor were identified. The obtained mechanical parameters were inputted into the finite element model, the rationalewas verified by a comparison of the finite element modal analysis and the experiments.