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Search Results: 1 - 10 of 71019 matches for " Yu CAO "
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A Simulation Study on Channel Estimation for Cooperative Communication System in Sand-dust Storm Environment  [PDF]
Xuehong Sun, Yu Cao, Jin Che
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2004
Abstract: There are many factors that influence the propagation of electromagnetic wave in the sand-dust storm environment, the scattering effect of dust particle is one of the major factors, so this paper focuses on the dust particles scattering function. The scattering of dust particles inevitably brings the multipath transmission of the signal, multipath propagation will bring the multipath fading of the signal. In this paper, we first investigate the use of AF and DF modes in a sand-dust storm environment. Secondly, we present a low-order modulation method should be used in cooperative communication system. Lastly, we evaluate the system performance for both of the moving nodes and power allocation. Experimental results validate the conclusion of theoretical derivation: the multipath fading is one of the main factors that affect the quality of signal transmission. Cooperative communication technology has good anti-fading ability, which can guarantee the signal transmission timely and correctly.
SCP-Trust Reasoning Strategy Based on Preference and Its Service Composition Process of Context-Aware Process  [PDF]
Xiaona Xia, Jiguo Yu, Baoxiang Cao
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29006

Before providing services to the user, user preference considerations are the key conditions to achieve the self-adaptive decision-making about service selection and composition process, which is the flexible concerned aspect provided by massive cloud computing environment data. Meanwhile, during the whole services’ providing process, achieving the capturing and forming of service aggregation units’ topology logic, building the context environment’s process-aware of service composition, ensuring the trust and adaptation among service aggregation units, which are the important reasons to express timely requirement preference. This paper designs SCP-Trust Reasoning strategy about the integration of user preference and trust, with process algebra, it is to achieve the context process-aware logic for service composition process, in order to improve the autonomous optimization and evolution of service implementation system.

The Harmonization of Professional Teaching and Professional-Competency Training in Financial Management  [PDF]
Wei Lin, Cao Shan, Song Yu
Chinese Studies (ChnStd) , 2014, DOI: 10.4236/chnstd.2014.34023
Abstract: With the expansion in enrollment scale of financial management and the increase in the pressure of job-hunting, more and more schools start to analyze the problem regarding how to cultivate excellent financial management talents who meet the social demand, and how to build their own features and brands (Zhang Junrui & Liu Donglin, 2005). In this paper, according to Chinese certified public accountants competence guide and starting from the professional competency model, we analyzed how to attain harmony between knowledge imparting and students’ vocational ability training in the professional education in financial management, and discussed the necessity of the coordination in the professional education in financial management and students’ vocational ability training. Finally, we discovered four pathways to harmonize financial management professional teaching and professional competency training: 1) establishment of dynamic course modules based on demand orientation; 2) reform of teaching methods; 3) bringing practical experts into the classroom; 4) establishment of a multi-dimensional students learning quality evaluation.
Medical Image Segmentation of Improved Genetic Algorithm Research Based on Dictionary Learning  [PDF]
Xianqi Cao, Jiaqing Miao, Yu Xiao
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.51008
Abstract: The image signal is represented by using the atomic of image signal to train an over complete dictionary and is described as sparse linear combinations of these atoms. Recently, the dictionary algorithm for image signal tracking and decomposition is mainly adopted as the focus of research. An alternate iterative algorithm of sparse encoding, sample dictionary and dictionary based on atomic update process is K-SVD decomposition. A new segmentation algorithm of brain MRI image, which uses the noise reduction method with adaptive dictionary based on genetic algorithm, is presented in this paper, and the experimental results show that the algorithm in brain MRI image segmentation has fast calculation speed and the advantage of accurate segmentation. In a very complicated situation, the results show that the segmentation of brain MRI images can be accomplished successfully by using this algorithm, and it achieves the ideal effect and has good accuracy.
2,2′-(Biphenyl-4,4′-diyldioxy)diacetic acid N,N-dimethylformamide solvate
Yu-Juan Cao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809025914
Abstract: In the crystal struture of the title compound, C16H14O6·C3H7NO, the two crystallographically independent benzene rings are coplanar [dihedral angle = 1.00 (2)°]. The crystal structure is stabilized by O—H...O hydrogen bonds between the diacid and the solvate dimethylformamide molecule, resulting in the formation of a zigzag chain structure extending parallel to [001].
Ying-Yu Cao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034252
Abstract: In the mononuclear title complex, [Ni(C14H6O8S2)(C12H8N2)2(H2O)], the NiII atom is in a distorted octahedral coordination formed by four N atoms from two chelating 1,10-phenanthroline ligands and by two O atoms, one from a 9,10-dioxoanthracene-1,5-disulfonate ligand and the other from a water molecule. An intramolecular O—H...O hydrogen bond occurs. In the crystal, intermolecular O—H...O hydrogen bonds link the mononuclear complexes into chains extending parallel to [010]. Furthermore, π–π stacking interactions [centroid–centroid distance = 3.5696 (6) ] stabilize the crystal structuure.
State Space System Identification of 3-Degree-of-Freedom (DOF) Piezo-Actuator-Driven Stages with Unknown Configuration
Yu Cao,Xiongbiao Chen
Actuators , 2013, DOI: 10.3390/act2010001
Abstract: Due to their fast response, high accuracy and non-friction force, piezo-actuators have been widely employed in multiple degree-of-freedom (DOF) stages for various nano-positioning applications. The use of flexible hinges in these piezo-actuator-driven stages allows the elimination of the influence of friction and backlash clearance, as observed in other configurations; meanwhile it also causes more complicated stage performance in terms of dynamics and the cross-coupling effect between different axes. Based on the system identification technique, this paper presents the development of a model for the 3-DOF piezo-actuator-driven stages with unknown configuration, with its parameters estimated from the Hankel matrix by means of the maximum a posteriori (MAP) online estimation. Experiments were carried out on a commercially-available piezo-actuator-driven stage to verify the effectiveness of the developed model, as compared to other methods. The results show that the developed model is able to predict the stage performance with improved accuracy, while the model parameters can be well updated online by using the MAP estimation. These capabilities allow investigation of the complicated stage performance and also provide a starting point from which the mode-based control scheme can be established for improved performance.
Non-equilibrium Thermal Super-radiation of Real Materials
Yiling Yu,Linyou Cao
Physics , 2013,
Abstract: We elucidate the theoretically maximal thermal radiation power from real materials at a given temperature. Our results demonstrate that the thermal radiation from real materials may be larger than the blackbody emission in free space,and indicate that this is rooted in the high refractive index of the materials. The refractive index contrast between the materials and environment dictates the radiation of real materials genetically not under thermodynamic equilibrium, but on the other hand can give rise to a larger density of photonic modes than that of the blackbody. One key to maximize the thermal radiation is to minimize the impedance mismatch of the materials with environment. By following this principle, we present a design of a carbon core coated by a four-layer transparent shell with gradually changed refractive indexes that can emit > 30 times more power than the blackbody, which reasonably approaches the predicted radiation maximum.
Leaky Mode Engineering: A General Design Principle for Dielectric Optical Antenna Solar Absorbers
Yiling Yu,Linyou Cao
Physics , 2013, DOI: 10.1016/j.optcom.2013.10.051
Abstract: We present a general principle for the rational design of dielectric optical antennas with optimal solar absorption enhancement: leaky mode engineering. This builds upon our previous study that demonstrates the solar absorption of a material with a given volume only dependent on the density and the radiative loss of leaky modes of the material. Here we systematically examine the correlation among the modal properties (density and radiative loss) of leaky modes, physical features, and solar absorption of dielectric antenna structures. Our analysis clearly points out the general guidelineS for the design of dielectric optical antennas with optimal solar absorption enhancement: a) using 0D structures; b) the shape does not matter much; c) heterostructuring with non-absorbing materials is a promising strategy; d) the design of a large-scale nanostructure array can use the solar absorption of single nanostructures as a reasonable reference.
Inverse Photoelectrochemical Cell
Qiang Yu,Chuanbao Cao
Physics , 2013,
Abstract: The splitting of water with sunlight using photoelectrochemical cell (PEC) to produce hydrogen is a promising avenue for sustainable energy production. The greatest virtue of PEC is that it uses sunlight as the only source to split water, but its efficiencies are still quite low due to poor performances of the available materials (such as SrTiO3). Consequently, another way of PEC research has been developed. By simultaneously using sunlight and electricity as energy source, PEC can get a larger current at a lower voltage, i.e., hydrogen can be made under the voltage below 1.23V, the minimum voltage required by electrolysis of water. But so far the efficiencies of the mainstream materials (such as TiO2) remain low. Where is the future development direction of PEC? Here we propose a new PEC model. Its operating principle is quite the opposite of the aforesaid conventional PEC, that is, the previous photoanode/photocathode is converted into the present photocathode/photoanode. It can also obtain high current under low voltage, even near zero voltage in extreme conditions. A basic single configuration and an improved n-p configuration were designed. We reselected materials for photoelectrodes, and confirmed its feasibility successfully. Two preliminary results were obtained from two contrasts: whether compared with water electrolysis or conventional PEC water splitting, the inverse PEC showed promising superiority.
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