摘要：
To overcome the deficiencies of weak local search ability in genetic algorithms (GA) and slow global convergence speed in ant colony optimization (ACO) algorithm in solving complex optimization problems, the chaotic optimization method, multi-population collaborative strategy and adaptive control parameters are introduced into the GA and ACO algorithm to propose a genetic and ant colony adaptive collaborative optimization (MGACACO) algorithm for solving complex optimization problems. The proposed MGACACO algorithm makes use of the exploration capability of GA and stochastic capability of ACO algorithm. In the proposed MGACACO algorithm, the multi-population strategy is used to realize the information exchange and cooperation among the various populations. The chaotic optimization method is used to overcome long search time, avoid falling into the local extremum and improve the search accuracy. The adaptive control parameters is used to make relatively uniform pheromone distribution, effectively solve the contradiction between expanding search and finding optimal solution. The collaborative strategy is used to dynamically balance the global ability and local search ability, and improve the convergence speed. Finally, various scale TSP are selected to verify the effectiveness of the proposed MGACACO algorithm. The experiment results show that the proposed MGACACO algorithm can avoid falling into the local extremum, and takes on better search precision and faster convergence speed.
摘要：
This paper presents a hybrid differential evolution (DE) with quantum-behaved particle swarm optimization (QPSO) for the unmanned aerial vehicle (UAV) route planning on the sea. The proposed method, denoted as DEQPSO, combines the DE algorithm with the QPSO algorithm in an attempt to further enhance the performance of both algorithms. The route planning for UAV on the sea is formulated as an optimization problem. A simple method of pretreatment to the terrain environment is proposed. A novel route planner for UAV is designed to generate a safe and flyable path in the presence of different threat environments based on the DEQPSO algorithm. To show the high performance of the proposed method, the DEQPSO algorithm is compared with the real-valued genetic algorithm, DE, standard particle swarm optimization (PSO), hybrid particle swarm with differential evolution operator, and QPSO in terms of the solution quality, robustness, and the convergence property. Experimental results demonstrate that the proposed method is capable of generating higher quality paths efficiently for UAV than any other tested optimization algorithms.
通讯机构：
[Cao, Can] Cent S Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.
关键词：
density functional theory, doping, Fermi level, graphene, Green's function methods, nanoribbons, spin polarised transport
摘要：
By using non-equilibrium Green's functions in combination with the density-functional theory, we investigate the spin transport properties of molecular junctions based on 3d transition terminated zigzag graphene nanoribbons. The results show that the electronic transport properties are strongly depending on the type of terminated atom at the edge of ribbon. The currents of spin-up and spin-down display different behaviors, and the spin-filter effects can be observed. These unconventional doping effects could be used to design novel nanospintronics devices. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4723832]
期刊：
Annals of Nuclear Energy,2017年106:247-255 ISSN：0306-4549
通讯作者：
Jiang, Jianjun
作者机构：
[Jiang, Jianjun; Zhang, Li] Hunan Inst Technol, Sch Safety & Environm Engn, Hengyang 421002, Hunan, Peoples R China.;[Jiang, Jianjun; Wang, Yiqun; Zhang, Mengjia; Xie, Tian] Univ South China, Sch Econ & Management, Human Factors Inst, Hengyang 421001, Hunan, Peoples R China.;[Li, Min; Wu, Daqing] Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Peng, Yuyuan] South China Univ Technol, Guangzhou Coll, Sch Comp Engn, Guangzhou 510830, Guangdong, Peoples R China.;[Peng, Jie] GuangDong Univ Finance & Econ, Informat Sci Coll, Guangzhou 510320, Guangdong, Peoples R China.
通讯机构：
[Jiang, Jianjun] Hunan Inst Technol, Sch Safety & Environm Engn, Hengyang 421002, Hunan, Peoples R China.;[Jiang, Jianjun] Univ South China, Sch Econ & Management, Human Factors Inst, Hengyang 421001, Hunan, Peoples R China.
关键词：
Human reliability<&wdkj&>Quantity of components<&wdkj&>Quick convergence search method<&wdkj&>Affinity error probability mapping function
摘要：
This is the second in a series of papers describing the optimal design method for a digital human computer interface of nuclear power plant (Npp) from three different points based on human reliability. The purpose of this series is to explore different optimization methods from varying perspectives. This present paper mainly discusses the optimal design method for quantity of components of the same factor. In monitoring process, quantity of components has brought heavy burden to operators, thus, human errors are easily triggered. To solve the problem, the authors propose an optimization process, a quick convergence search method and an affinity error probability mapping function. Two balanceable parameter values of the affinity error probability function are obtained by experiments. The experimental results show that the affinity error probability mapping function about human-computer interface has very good sensitivity and stability, and that quick convergence search method for fuzzy segments divided by component quantity has better performance than general algorithm. (C) 2017 Elsevier Ltd. All rights reserved.
期刊：
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics),2006年4088:590-595 ISSN：0302-9743
期刊：
Chinese Physics B,2010年19(9): 097301-1-097301-5 ISSN：1674-1056
通讯作者：
Xu Hui
作者机构：
[Xu Hui; Ouyang Fang-Ping; Ma Song-Shan; Chen Ling-Na; Xiao Jin; Wu Xiao-Zan] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.;[Chen Ling-Na] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Xu Hui] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.
关键词：
transport properties;negative differential resistance;first-principles;crossed graphene nanoribbons
摘要：
By using first-principles calculations and nonequilibrium Green's function technique, we study elastic transport properties of crossed graphene nanoribbons. The results show that the electronic transport properties of molecular junctions can be modulated by doped atoms. Negative differential resistance (NDR) behaviour can be observed in a certain bias region, when crossed graphene nanoribbons are doped with nitrogen atoms at the shoulder, but it cannot be observed for pristine crossed graphene nanoribbons at low biases. A mechanism for the negative differential resistance behaviour is suggested.
作者：
Wu, X. Z.;Long, M. Q.*;Chen, L. N.;Cao, C.;Ma, S. S.;Xu, H.
期刊：
Physica E: Low-Dimensional Systems and Nanostructures,2012年45:82-85 ISSN：1386-9477
通讯作者：
Long, M. Q.
作者机构：
[Cao, C.; Wu, X. Z.] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Long, M. Q.; Xu, H.] Cent S Univ, Coll Sci & Technol, Sch Phys & Electon, Changsha 410083, Hunan, Peoples R China.;[Chen, L. N.] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Long, M. Q.] Cent S Univ, Coll Sci & Technol, Sch Phys & Electon, Changsha 410083, Hunan, Peoples R China.
摘要：
Applying nonequilibrium Green’s functions in combination with the density functional theory, we investigated the effect of amino and hydroxyl groups on the transport property of the carbon atomic chains. The results show the conductance oscillation with the length and the parity of the carbon atomic chains, and the electronic transport properties can be modulated by the sites of amino and hydroxyl groups. And also, the negative differential resistance behaviors can be observed clearly. These phenomena may originate from the interaction of side groups with the carbon atomic chains and the change in coupling degree between the molecular orbitals and electrode states.
期刊：
Solid State Communications,2014年191:59-65 ISSN：0038-1098
通讯作者：
Chen, L. N.
作者机构：
[Chen, L. N.] Cent S Univ, Sch Informat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Chen, L. N.] Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, L. N.] Cent S Univ, Sch Informat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
关键词：
A. Armchair graphene nanoribbon<&wdkj&>D. B/N doping<&wdkj&>D. Energy gap<&wdkj&>E. First-principles
摘要：
Using the first-principles calculations based on density functional theory, we investigated the electronic properties of armchair graphene nanoribbons (AGNRs) with boron nitrogen (BN) doping. The B and N impurities can adjust the electronic properties of the AGNRs, whose features strongly depend on the impurity types and the ribbon width of the AGNRs. Interestingly, with the increase of the ribbon width, the energy gap of the AGNRs with B/N pair doping is oscillatory. The AGNRs with B or N doping show metallic behavior, and the localized unsaturated electronic states on the edge atoms lead to magnetism. These unconventional doping effects could be used to design semiconductor electronic devices. (C) 2014 Elsevier Ltd. All rights reserved.
摘要：
Using the first-principles calculations, we investigate the electronic band structure and the quantum transport properties of metallic carbon nanotubes (MCNTs) with B/N pair co-doping. The results about formation energy show that the B/N pair co-doping configuration is a most stable structure. We find that the electronic structure and the transport properties are very sensitive to the doping concentration of the B/N pairs in MCNTs, where the energy gaps increase with doping concentration increasing both along the tube axis and around the tube, because the mirror symmetry of MCNT is broken by doping B/N pairs. In addition, we discuss conductance dips of the transmission spectrum of doped MCNTs. These unconventional doping effects could be used to design novel nanoelectronic devices
作者：
Chen, L. N.;Wu, X. Z.;Huang, W. R.;Ma, S. S.;Xu, H.*
期刊：
Solid State Communications,2012年152(10):868-872 ISSN：0038-1098
通讯作者：
Xu, H.
作者机构：
[Ma, S. S.; Xu, H.; Wu, X. Z.; Huang, W. R.; Chen, L. N.] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;[Chen, L. N.] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.;[Huang, W. R.] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Xu, H.] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
A. Metallic carbon nanotube<&wdkj&>D. Electronic property<&wdkj&>D. Impurity and defect<&wdkj&>E. First-principles
摘要：
Using first-principles calculations based on spin-polarized density functional theory, we investigate the electronic properties of metallic carbon nanotubes (MCNTs) with partial hydrogenation or vacancy defects. The calculated results show that the energy band structures of MCNTs strongly depend on the adsorption site or the vacancy-defect site. Interestingly, our results show the nonmagnetic semiconducting behavior of MCNTs in the case of balanced H adsorption or vacancy defects. However, the MCNTs exhibit magnetic metallic behavior in the case of imbalanced H adsorption or vacancy defects, and the energy band structure of MCNTs shows the appearance of a spin-polarized flat band near the Fermi level. This effect presents a possibility for spintronic device and semiconducting molecular wire applications.
摘要：
Joint inference is a fundamental issue in the field of artificial intelligence. The greatest advantage of the joint inference is demonstrated by its capability of avoiding errors from cascading and accumulating on a pipeline of multiple chained sub-tasks. Markov Logic Network(MLN) is the most common joint inference model that provides a flexible representation and handles uncertainty. It has been applied successfully to joint inference on many natural language processing tasks to avoid error propagation. However, due to the great expressiveness of first-order logic, the representation for it in MLN generates rather complicated graph structures, which makes the learning and inference on large scale data intractably. In this paper, we present an ensemble learning approach to deal with the challenges in MLNs. Firstly, we give a proof within the probably approximately correct (PAC) framework. The proof points out what conditions are necessary for successful applying the ensemble learning approach to MLN. Secondly, the paper explains how to combine the learners. Finally, in order to illustrate the working mechanism of the ensemble joint inference model, we present an Ensemble Markov Logic Networks (EMLNs) method and use it to extract knowledge from a large scale corpus published by Google.1 Experiments suggest that significant speedup can be gained by the EMLNs. Meanwhile, it show that this approach leads to a higher precision and recall than that of those pipeline approaches. (C) 2017 Elsevier Ltd. All rights reserved.
关键词：
Single image super-resolution<&wdkj&>Gradient tree boosting<&wdkj&>Multi-output regression
摘要：
The learning-based single image super-resolution (SISR) algorithm aims at recovering a high-resolution (HR) image from low-resolution (LR) input. The quality of the HR output mainly depends on the strength of the learning algorithms. Observing that gradient boosting is powerful in dealing with learning problems, we propose a new SISR method based on the gradient boosting framework. First, the boosting framework is extended to the general form of multi-output regression. Then, an error correction approximation is used to sequentially train the boosting trees. The training data for each tree are the pairs of the features of the LR image patches and the negative gradients of the loss function. Meanwhile, shrinkage, a slow learning strategy, is exploited to reduce the risk of overfitting. Finally, all boosting trees are linearly combined to form an accurate predictor. The experimental results verify that our method can generate visually pleasant HR images and achieve accuracy on par with state-of-the-art methods in terms of quantitative evaluation.
作者机构：
[Long, M. Q.; Cao, C.; Xu, H.; Wu, X. Z.; Xiao, J.] Cent S Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.;[Xu, H.; Wu, X. Z.] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.;[Long, M. Q.; Cao, C.; Xu, H.; Wu, X. Z.; Xiao, J.; Chen, L. N.] Cent S Univ, Inst Super Microstruct & Ultrafast Proc, Changsha 410083, Peoples R China.;[Chen, L. N.] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Xu, H.] Cent S Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.
关键词：
Transport properties<&wdkj&>Molecular device<&wdkj&>Rectifying behavior<&wdkj&>Asymmetry electrode
摘要：
By applying nonequilibrium Green's functions in combination with the density functional theory, we have investigated the electronic transport properties of molecular devices consisting of the carbon atomic chain coupling with symmetry and asymmetry Au electrodes. The asymmetry Au electrodes systems display good rectifying behavior. The main origin of this phenomenon is that a molecular core coupling with asymmetry electrodes can generate two asymmetrical Schottky barriers at both extended molecule regions. This rectification is also explained by the calculated transmission spectrum and the spatial distribution of the LUMO and HOMO states. (c) 2012 Elsevier B.V. All rights reserved.
