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Search Results: 1 - 10 of 29371 matches for " YUAN Kun "
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Ethics as a Game? Towards a Framework for Game Design  [PDF]
Yuan Yuan, Kun Fu, Barend Pieter Venter, Thomas Hainey
Sociology Mind (SM) , 2019, DOI: 10.4236/sm.2019.93010
Abstract: Citizen morality reflects civilization and is significant to society. Ethics education for improving morality, especially in China, may fail because of its reliance on lecture-based teaching. Game-based learning presents an innovative approach to ethics education. This paper identifies problems in tertiary ethics education and reviews relevant game design principles before establishing a framework for designing educational games that may assist in ethics education. It then proposes a game design model for teaching ethics.
Transmission Scheduling Algorithm in DTN  [PDF]
Wei Yu, Hongyan Li, Jiandong Li, Lin Jin, Kun Yuan
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2047
Abstract: Delay Tolerant Networks (DTNs) is a dynamic topology network, in which connection durations of each link are variable and paths between two nodes are intermittent. Most of protocols which are widely used in traditional wireless network are not suitable for DTNs. DTN adopts store-and-forward mechanism to cope with the problem of intermittent path. With limited storage of each node, it is a challenge for scheduling nodes’ transmission to avoid overflow of nodes’ buffers. In this paper we propose an optimal transmission scheduling algorithm for DTN with nodes’ buffer constraints. The object of the optimal algorithm is to get maximum throughput. We also present an algorithm for obtaining suboptimal transmission schedules. Our solution is certified through simulation, and it is observed that our solution can improve network performance in the aspects of avoiding overflow and increasing network throughput.
Fault Isolation of Light Rail Vehicle Suspension System Based on D-S Evidence Theory and Improvement Application Case  [PDF]
Xiukun Wei, Kun Guo, Limin Jia, Guangwu Liu, Minzheng Yuan
Journal of Intelligent Learning Systems and Applications (JILSA) , 2013, DOI: 10.4236/jilsa.2013.54029
Abstract:

This paper presents an innovative approach for the fault isolation of Light Rail Vehicle (LRV) suspension system based on the Dempster-Shafer (D-S) evidence theory and its improvement application case. The considered LRV has three rolling stocks and each one equips three sensors for monitoring the suspension system. A Kalman filter is applied to generate the residuals for fault diagnosis. For the purpose of fault isolation, a fault feature database is built in advance. The Eros and the norm distance between the fault feature of the new occurred fault and the one in the feature database are applied to measure the similarity of the feature which is the basis for the basic belief assignment to the fault, respectively. After the basic belief assignments are obtained, they are fused by using the D-S evidence theory. The fusion of the basic belief assignments increases the isolation accuracy significantly. The efficiency of the proposed method is demonstrated by two case studies.

Evolution, Achievements, and Challenges for New Cooperative Medical Schemes in Rural China  [PDF]
Kun Zhu, Xiaojuan Zhang, Shasha Yuan, Miaomiao Tian
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.713140
Abstract: Objectives: To describe the development of NCMS in the past decade including three sections and to bring up relevant policy implications. Methods: Based on secondary data and literature review, the evolution and achievement of NCMS in the past decade and the expected future challenges were analyzed. Results: Impressive advances have been seen in establishing the largest medical insurance system, New Cooperative Medical Scheme (NCMS), covered more than 800 million farmers in rural China during the past decade. Remarkable achievements during the development of NCMS include universal health coverage among rural residents, rapid increasing premium, balanced pooling fund, improved service, cost and coverage of farmers, and a strengthened primary health care system. In the meantime, the NCMS also confronted certain challenges: Institutionalization and legalization lagged behind the development of NCMS; payment reform failed to control the rapid growth of medical expenditure and financial protection for enrollees was insufficient; solidarity and equity between NCMS and other medical insurance systems is still an issue that needs to be solved; sustainable financing mechanism was not established successfully and moreover, it was also not compatible with the aging population and epidemiological transition of rural China; double coverage for rural residents turned up as portability was not achieved.
Synchronization of Coupled Networks with Mixed Delays by Intermittent Control
Kun Yuan,Jinde Cao,Shumin Fei
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/927609
Abstract: The synchronization of coupled networks with mixed delays is investigated by employing Lyapunov functional method and intermittent control. A sufficient condition is derived to ensure the global synchronization of coupled networks, which is controlled by the designed intermittent controller. Finally, a numerical simulation is constructed to justify the theoretical analysis.
Theoretical study on the lithium bond interaction of furan homologues C4H4Y (Y=O, S) with LiCH3 via DFT and MP2
Kun Yuan,LingLing Lü,YanZhi Liu
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0211-y
Abstract: The optimizations geometries and interaction energy corrected by BSSE of the complexes between C4H4Y (Y=O, S) and CH3Li have been calculated at the B3LYP/6-311++G** and MP2/6-311++G** levels. Three complexes were obtained. Abnormally, the calculations showed that all the C10-Li14 bond lengths increased obviously but the blue-shift of C10-Li14 stretching frequency occurred after formed complexes. The calculated binding energy with basis set super-position error (BSSE) and zero-point vibrational energy corrections of complexes I–III is 45.757, 35.700 and 39.107 kJ·mol 1, respectively. The analyses on the combining interaction with the atom-in-molecules theory (AIM) also showed that a relatively strong lithium bond interaction presented in furan homologues C4H4Y---LiCH3 systems. Natural bond orbital theory (NBO) analysis has been performed, and the results revealed that the complex I is formed with n-σ type lithium bond interaction between C4H4O and LiCH3, complex II is formed with π-s type lithium bond interaction between C4H4O and LiCH3, and complex III is formed with π-s and n-s type lithium bond interactions between C4H4S and LiCH3, respectively.
Theoretical study of N(C)-H H-B multi-dihydrogen bonds
Yuan Kun,YanZhi Liu,LingLing Lü
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0101-y
Abstract: The optimized geometries, frequencies and interaction energy corrected with basis set superposition error (BSSE) of the multi-dihydrogen bond complexes C4H4NHBH 4 and CH≡CH BH 4 have been calculated at both the B3LYP/6-311++G** and the MP2/6-311++G** levels. The calculations were performed to study the nature of the N-H H3-B and C-H H2-B red shift multi dihydrogen bond in complex C4H4NH BH 4 and CH≡CH BH 4 The BSSE-corrected multi-dihydrogen bond interaction energy of complex I (C4H4NH BH 4 ) and complex II (CH≡CH BH 4 ) is 76.62 and 33.79 kJ/mol (MP2/6-311++G**), respectively. From the natural bond orbital (NBO) analysis, we detailedly discussed the orbital interactions, electron density transfers, rehybridizations and the essential of the correlative bond length changes in the two complexes. In addition, solvent effect on the geometric structures, vibration frequencies and interaction energy of the monomer and complexes was studied in detail. It is relevant to the relatively dielectric constants (ε).
Theoretical study on the lithium bond interaction of furan homologues C4H4Y (Y=O, S) with LiCH3 via DFT and MP2

YUAN Kun,LV LingLing,LIU YanZhi,

科学通报(英文版) , 2008,
Abstract: The optimizations geometries and interaction energy corrected by BSSE of the complexes between C4H4Y (Y=O, S) and CH3Li have been calculated at the B3LYP/6-311++G** and MP2/6-311++G** levels. Three complexes were obtained. Abnormally, the calculations showed that all the C10-Li14 bond lengths increased obviously but the blue-shift of C10-Li14 stretching frequency occurred after formed complexes. The calculated binding energy with basis set super-position error (BSSE) and zero-point vibrational energy corrections of complexes I–III is 45.757, 35.700 and 39.107 kJ·mol 1, respectively. The analyses on the combining interaction with the atom-in-molecules theory (AIM) also showed that a relatively strong lithium bond interaction presented in furan homologues C4H4Y---LiCH3 systems. Natural bond orbital theory (NBO) analysis has been performed, and the results revealed that the complex I is formed with n-σ type lithium bond interaction between C4H4O and LiCH3, complex II is formed with π-s type lithium bond interaction between C4H4O and LiCH3, and complex III is formed with π-s and n-s type lithium bond interactions between C4H4S and LiCH3, respectively. Support by the Natural Science Education Foundation of Gansu Province (Grant NO. 07-08-12)
Theoretical study of N(C)-H?H-B multi-dihydrogen bonds
Theoretical study of N(C)―H…H―B multi-dihydrogen bonds

Yuan Kun,YanZhi Liu,LingLing Lü,

科学通报(英文版) , 2009,
Abstract: The optimized geometries, frequencies and interaction energy corrected with basis set superposition error (BSSE) of the multi-dihydrogen bond complexes C4H4NHBH4 and CH≡CH BH4 have been calculated at both the B3LYP/6-311++G** and the MP2/6-311++G** levels. The calculations were performed to study the nature of the N-H H3-B and C-H H2-B red shift multi dihydrogen bond in complex C4H4NH BH4 and CH≡CH BH4 The BSSE-corrected multi-dihydrogen bond interaction energy of complex I (C4H4NH BH4 ) and complex II (CH≡CH BH4 ) is 76.62 and 33.79 kJ/mol (MP2/6-311++G**), respectively. From the natural bond orbital (NBO) analysis, we detailedly discussed the orbital interactions, electron density transfers, rehybridizations and the essential of the correlative bond length changes in the two complexes. In addition, solvent effect on the geometric structures, vibration frequencies and interaction energy of the monomer and complexes was studied in detail. It is relevant to the relatively dielectric constants (ε). Support by the Natural Science Education Foundation of Gansu Province (Grant NO. 07-08-12) and “QingLan” Talent Engineering Fund of Tianshui Normal University
On the Convergence of Decentralized Gradient Descent
Kun Yuan,Qing Ling,Wotao Yin
Mathematics , 2013,
Abstract: Consider the consensus problem of minimizing $f(x)=\sum_{i=1}^n f_i(x)$ where each $f_i$ is only known to one individual agent $i$ out of a connected network of $n$ agents. All the agents shall collaboratively solve this problem and obtain the solution subject to data exchanges restricted to between neighboring agents. Such algorithms avoid the need of a fusion center, offer better network load balance, and improve data privacy. We study the decentralized gradient descent method in which each agent $i$ updates its variable $x_{(i)}$, which is a local approximate to the unknown variable $x$, by combining the average of its neighbors' with the negative gradient step $-\alpha \nabla f_i(x_{(i)})$. The iteration is $$x_{(i)}(k+1) \gets \sum_{\text{neighbor} j \text{of} i} w_{ij} x_{(j)}(k) - \alpha \nabla f_i(x_{(i)}(k)),\quad\text{for each agent} i,$$ where the averaging coefficients form a symmetric doubly stochastic matrix $W=[w_{ij}] \in \mathbb{R}^{n \times n}$. We analyze the convergence of this iteration and derive its converge rate, assuming that each $f_i$ is proper closed convex and lower bounded, $\nabla f_i$ is Lipschitz continuous with constant $L_{f_i}$, and stepsize $\alpha$ is fixed. Provided that $\alpha < O(1/L_h)$ where $L_h=\max_i\{L_{f_i}\}$, the objective error at the averaged solution, $f(\frac{1}{n}\sum_i x_{(i)}(k))-f^*$, reduces at a speed of $O(1/k)$ until it reaches $O(\alpha)$. If $f_i$ are further (restricted) strongly convex, then both $\frac{1}{n}\sum_i x_{(i)}(k)$ and each $x_{(i)}(k)$ converge to the global minimizer $x^*$ at a linear rate until reaching an $O(\alpha)$-neighborhood of $x^*$. We also develop an iteration for decentralized basis pursuit and establish its linear convergence to an $O(\alpha)$-neighborhood of the true unknown sparse signal.
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