Tian F.,Shanghai University |
Tian F.,Shanghai Film Special Effects Engineering Center |
Xu H.,ShanghaiUniversity |
Feng X.,Shanghai University |
And 4 more authors.
Journal of Display Technology | Year: 2016
The intensity of feeling and comfort are two contrasting aspects of 3D movies. This paper studies 3D comfort according to crosstalk, basic parallax, space motion, and depth of field based on pixels. A method for calculating 3D motion based on the XYZ axes is presented, and a pixel-based evaluation model of 3D comfort is established with parallax, motion, and other indexes. In order to support the production and evaluation process of 3D films, a 3D comfort evaluation tool is designed according to time series. As demonstrated experimentally, basic parallax, depth of field, and average crosstalk have certain impact on the entire 3D comfort, while space motion has a relatively salient effect. When applying our method, a steady control on 3D comfort is found in high-quality 3D films: About 92% of comfort is within the range of 1-3.5 points for Transformers: Age of Extinction (USA), whereas about 74% of comfort is within the range of 1-3.5 points for The Monkey King (China). Large depth of field for slow moving lens and small depth of field for fast moving lens were used in Avatar and Transformers, and these 3D art rules are not followed closely in The Monkey King. As a basic tool for 3D film production, our proposed method can be applied in creating, shooting, producing, and monitoring for a 3D film. © 2005-2012 IEEE.
Wang B.,ShanghaiUniversity |
Jiang Y.,ShanghaiUniversity |
Jiang Y.,Shanghai Key Laboratory of HighTemperature Superconductors
European Physical Journal D | Year: 2016
Abstract: We investigate the disorder effect on coherent fraction and the quantum phase transitionof ultracold dilute Bose gases trapped in disordered optical lattices. Within theframework of Bogoliubov theory, an analytical expression for the particle density isderived and the dependence of coherent fraction on disorder strength as well as on latticedepth is discussed. In weak disorder regime, we find a decreased sensitivity of coherentfraction to disorder with the increase of on-site interaction strength. For strongdisorder, the quantum phase boundary between superfluid phase and Bose glass phase in thedisordered Bose-Hubbard system in weak interaction regime is discussed qualitatively. Theobtained phase diagram is in agreement with the empirical square-root law. The dependenceof the corresponding critical value of the disorder strength on optical lattice depth ispresented as well, and may serve as a reference object for possible experimentalinvestigation. Graphical abstract: [Figure not available: see fulltext.] © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Zhao X.,Shanghai University |
Gao J.,ShanghaiUniversity |
Wei Y.,Shanghai University
Proceedings of the 2012 National Conference on Information Technology and Computer Science, CITCS 2012 | Year: 2012
To study the M/M/C(n) queuing system in which a sever can service multiple customers at the same time, the stability equations is constructed, by which the stability probability is solved, and then some system operation indexes are obtained. Furthermore, based on those operation indexes, the number of customers on simultaneous service is optimized, some properties for the optimal solutions are obtained, and then two algorithms are given to solve the optimal problem. © 2012. The authors - Published by Atlantis Press.
Wang X.-M.,Shanghai University |
Li H.,Shanghai University |
Yin Z.-N.,Shanghai University |
Yin Z.-N.,Shanghaiuniversity |
Xiao H.,Shanghai University
Rubber Chemistry and Technology | Year: 2014
We propose an explicit approach to obtaining multiaxial strain energy functions for incompressible, isotropic rubberlike materials undergoing large deformations. Via polynomial interpolation, we first obtain two one-dimensional strain energy functions separately from uniaxial data and shear data, and then, from these two, we obtain a multiaxial strain energy function by means of direct procedures based on well-designed logarithmic invariants. This multiaxial strain energy function exactly fits any given data from four benchmark tests, including uniaxial and equibiaxial extension, simple shear, plane-strain extension, and so forth. Furthermore, its predictions for biaxial stretch tests provide good accord with test data. The proposed approach is explicit in a sense without involving the usual procedures both in deriving forms of the multiaxial strain energy function and in estimating a number of unknown parameters.
Xu Y.,ShanghaiUniversity |
Feng J.,Chuzhou University |
Zhang Z.,ShanghaiUniversity |
Wang Y.,ShanghaiUniversity |
And 2 more authors.
Molecular Simulation | Year: 2010
A tentative simulation study has been carried out on the depletion phenomenon in diblock copolymer films through dissipative particle dynamics technology. Results indicate that a depletion layer appears in nearly all the systems with strong interaction between different components, accompanied with weak interaction between the component and the boundary. The system temperature plays a dominant role in the thickness of the depletion layer, on which the component fraction also has an effect to a certain extent. The findings can give support to relevant application processes. © 2010 Taylor & Francis.
Xie X.,ShanghaiUniversity |
Liu X.,ShanghaiUniversity |
Mao J.,ShanghaiUniversity |
Fan J.,ShanghaiUniversity |
Proceedings - 2015 6th International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2015 | Year: 2015
Sensor modeling and registration is the basis of sensor centralized management and sensor information sharing in Sensor Web. According to the SensorML standard developed by OGC, this paper proposes a user-oriented fast sensor process modeling and sensor registration method based on the in-depth analysis of the SensorML conceptual model of sensor description. With this method, all the information required to describe the sensor will be divided into three categories with defining the necessary elements, optional elements and element format for each category: Identification, Capabilities and Contact. Then the same category of information will be presented in the same form. Users only need to fill in these forms according to the process, and then complete the sensor modeling process by submitting these forms to the server. Finally, the server receives the information to generate XML formatted sensor information models of the SensorML standard. Users could complete the sensor registration with these models. In order to verify the feasibility of this method, this paper designs and realizes a fast sensor modeling and sensor registration online system based on the SensorML standard of version 1.0.1, and registers an in situ sensor to Sensor Observation Service(SOS) successfully by this system. © 2015 IEEE.
Gao S.,ShanghaiUniversity |
Li B.,ShanghaiUniversity |
Advanced Materials Research | Year: 2013
Grounding electrode electromagnetic flowmeter can reduce the loss of the measurement signal,and the conductivity lower medium can be measured if the area of the grounding electrode was increased. However, if the grounding electrode area is increased, the measurement signal will be reduced. The weight function theory of electromagnetic flow meter shows that the reason is the distribution of electromagnetic flow meter weight functions is changed by the grounding electrode, lead to the induced electromotive force every point of media in the pipeline contribution to the measuring electrode is changed. the weight function of the electromagnetic flowmeter which possesses one or two grounding electrodes was analyzed respectively, get the law of electromagnetic flowmeter output signal decreases with the increase of the grounding electrode area. Finally, the relationship of the electromagnetic flowmeter output signal and the ground electrode diameter accounted for measuring the ratio of the pipe been demonstrated. This theory and method has a certain significance to research and development grounding electrode electromagnetic flowmeter. © (2013) Trans Tech Publications, Switzerland.