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Search Results: 1 - 10 of 84001 matches for " Jian Yang "
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Structure Parameters Optimization Analysis of Hydraulic Hammer System  [PDF]
Guoping Yang, Jian Fang
Modern Mechanical Engineering (MME) , 2012, DOI: 10.4236/mme.2012.24018
Abstract:

In order to improve the impact performance, the structure of hydraulic hammer should be optimized. In this paper, the ranges of eight vital structure parameters of piston and reversing valve system of hydraulic hammer were selected firstly; and then found the best value of different parameters under experiments with the method of computer optimization and the parametric analysis method provided by ADAMS software. These methods worked and the best design values of parameters of hydraulic hammer were obtained. At last, the optimal impact energy of virtual prototype of hydraulic breaking hammer was calculated and compared with the original impact performance. The results reveal that impact performance of hydraulic hammer has been improved significantly.

Role of clusters in insulin-regulated GLUT4 trafficking in adipose cells: A new paradigm?
Jian Yang
International Journal of Biological Sciences , 2010,
Abstract: Insulin stimulates glucose transport in muscle and adipose cells by stimulating translocation of glucose transporter 4 (GLUT4) to the plasma membrane. In a recent Cell Metabolism paper, Stenkula et al. found that insulin controls the spatial distribution of GLUT4 on the surface of isolated adipose cells through regulation of their post-fusion dispersal. The presence of GLUT4 in plasma membrane-associated clusters is suggestive of a new paradigm in membrane protein recycling.
Simulating Visual Pattern Detection and Brightness Perception Based on Implicit Masking
Jian Yang
EURASIP Journal on Advances in Signal Processing , 2007, DOI: 10.1155/2007/75402
Abstract: A quantitative model of implicit masking, with a front-end low-pass filter, a retinal local compressive nonlinearity described by a modified Naka-Rushton equation, a cortical representation of the image in the Fourier domain, and a frequency-dependent compressive nonlinearity, was developed to simulate visual image processing. The model algorithm was used to estimate contrast sensitivity functions over 7 mean illuminance levels ranging from 0.0009 to 900 trolands, and fit to the contrast thresholds of 43 spatial patterns in the Modelfest study. The RMS errors between model estimations and experimental data in the literature were about 0.1 log unit. In addition, the same model was used to simulate the effects of simultaneous contrast, assimilation, and crispening. The model results matched the visual percepts qualitatively, showing the value of integrating the three diverse perceptual phenomena under a common theoretical framework.
Simulating Visual Pattern Detection and Brightness Perception Based on Implicit Masking
Yang Jian
EURASIP Journal on Advances in Signal Processing , 2007,
Abstract: A quantitative model of implicit masking, with a front-end low-pass filter, a retinal local compressive nonlinearity described by a modified Naka-Rushton equation, a cortical representation of the image in the Fourier domain, and a frequency-dependent compressive nonlinearity, was developed to simulate visual image processing. The model algorithm was used to estimate contrast sensitivity functions over 7 mean illuminance levels ranging from 0.0009 to 900 trolands, and fit to the contrast thresholds of 43 spatial patterns in the Modelfest study. The RMS errors between model estimations and experimental data in the literature were about 0.1 log unit. In addition, the same model was used to simulate the effects of simultaneous contrast, assimilation, and crispening. The model results matched the visual percepts qualitatively, showing the value of integrating the three diverse perceptual phenomena under a common theoretical framework.
Tortoise coordinate and Hawking effect in a dynamical Kerr black hole
Jian Yang
Physics , 2010, DOI: 10.1007/s10509-010-0457-0
Abstract: Hawking effect from a dynamical Kerr black hole is investigated using the improved Damour-Ruffini method with a new tortoise coordinate transformation. Hawking temperature of the black hole can be obtained point by point at the event horizon. It is found that Hawking temperatures of different points on the surface are different. Moreover, the temperature does not turn to zero while the dynamical black hole turns to an extreme one.
New Trial Wave Functions for Quantum Hall States at Half Filling
Jian Yang
Physics , 2011,
Abstract: New trial wave functions corresponding to half filling quantum Hall states are proposed. These wave functions are constructed by first pairing up the quasielectrons of the 1/3 Laughlin quantum Hall state, with the same relative angular momentum for each pair, and then making the paired quasielectrons condense into a 1/4 Laughlin state. The quasiparticle excitations of the proposed wave functions carry $\pm1/4$ of electron charge, and obey Abelian fractional statistics. In the spherical geometry, the total flux quanta $N_{\phi}$ is shown to be related to the number of electrons $N$ by $N_{\phi} = 2N-(5-q)$ with $q$ being the relative angular momentum between the quasielectrons in each pair which takes values of non-negative even integers. The overlaps are calculated between the proposed trial wave functions, including the ground state, quasiexciton states, and quasihole states, and the exact states of the finite size systems at $N_{\phi} = 2N-3$. The near unity overlaps are obtained in the lowest Landau level, while the moderate overlaps are obtained in the second Landau level. The relevance of the wave functions to the yet to be discovered fractional quantum Hall effect in the lowest Landau level, as well as the 5/2 quantum Hall effect is also discussed.
Asymptotic Behavior of Solutions for Competitive Models with Free Boundaries
Jian Yang
Mathematics , 2013,
Abstract: In this paper, we study a competitive model involving two species. When the competition is strong enough, the two species are separated by a free boundary. If the initial data has a positive bound at infinity. We prove that the solution will converge, as $t\rightarrow \infty$, to the traveling wave solution and the free boundary will move to infinity with a constant speed.
Modeling Risk and Ambiguity-on-Nature in Normal-form Games
Jian Yang
Computer Science , 2015,
Abstract: We propose multi-player frameworks that mitigate decision-theoretical difficulties with the traditional normal-form game, where players are concerned with expected utility functions of their payoffs. We react to Allais's (1953) paradox by concerning players with potentially nonlinear functionals of the payoff distributions they encounter. To counter Ellsberg's (1961) paradox, we let players optimize on vectors of payoff distributions in which every component is a payoff distribution corresponding to one particular nature action. In the preference game we introduce, players merely express preferences over payoff-distribution vectors. Depending on ways in which players' mixed strategies are verified, there will emerge two equilibrium concepts, namely, the ex post and ex ante types. Conditions for equilibrium existence are identified; also, the unification of the two concepts at the traditional game is explained. When the preference relations lead to real-valued satisfaction functions, we have a satisfaction game. Two notable special cases are one coping with Gilboa and Schmeidler's (1989) ambiguity-averse worst-prior setup and another involving Artzner et al.'s (1999) coherent-risk measure with risk-averse tendencies. For both, searching for ex post equilibria boils down to solving sequences of simple nonlinear programs (NLPs).
A Link between Sequential Semi-anonymous Nonatomic Games and their Large but Finite Counterparts
Jian Yang
Quantitative Finance , 2015,
Abstract: We show that equilibria of a sequential semi-anonymous nonatomic game (SSNG) can be adopted by players in corresponding large but finite dynamic games to achieve near-equilibrium payoffs. Such equilibria in the form of random state-to-action rules are parsimonious in form and easy to execute, as they are both oblivious of past history and blind to other players' present states. Our transient results can be extended to a stationary case, where the finite counterparts are special discounted stochastic games. The kind of equilibria we adopt for SSNG are similar to distributional equilibria that are well understood in literature, and they themselves are shown to exist.
Analysis of Markovian Competitive Situations using Nonatomic Games---the Shock-driven Case and Its Dynamic Pricing Application
Jian Yang
Quantitative Finance , 2015,
Abstract: We show that equilibria derived for nonatomic games (NGs) can be used by large finite games to achieve near-equilibrium performances. Rather than single-period games, we deal with dynamic games in which the evolution of a player's state is influenced by his own action as well as other players' states and actions. We focus on the case where both random state transitions and random actions are driven by independently generated shocks. The NG equilibria we consider are random state-to-action maps. The simple NG equilibria are adoptable to a variety of real situations where awareness of other players' states can be anywhere between full and none. Transient results here also form the basis for a link between an NG's stationary equilibrium (SE) and good stationary profiles for large finite games. Our approach works well for certain dynamic pricing games, both without and with production.
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