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OALib Journal期刊

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匹配条件: “ Linan Zhong” ,找到相关结果约16130条。
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Unique Common Fixed Point in b2 Metric Spaces  [PDF]
Jinxing Cui, Jinwei Zhao, Linan Zhong
Open Access Library Journal (OALib Journal) , 2017, DOI: 10.4236/oalib.1103896
Abstract:
We establish some common fixed and common coincidence point theorems for expansive type mappings in the setting of b2 metric space. Our results extend some known results in metric spaces to b2 metric space. The research is meaningful and I recommend it to be published when the followings have been improved.
Fixed Point Results for Weakly C-Contraction Mapping in Modular Metric Spaces  [PDF]
Jinwei Zhao, Qianqian Zhao, Bo Jin, Linan Zhong
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104061
Abstract:
In this paper, we introduce the concept of weakly C-contraction mapping in modular metric spaces. And we established some fixed point results in w-complete spaces. Our results encompass various generalizations of Banach contraction.
Thick Points of High-Dimensional Gaussian Free Fields
Linan Chen
Mathematics , 2015,
Abstract: This work aims to extend the existing results on thick points of logarithmic-correlated Gaussian Free Fields to Gaussian random fields that are more singular. To be specific, we adopt a sphere averaging regularization to study polynomial-correlated Gaussian Free Fields in higher-than-two dimensions. Under this setting, we introduce the definition of thick points which, heuristically speaking, are points where the value of the Gaussian Free Field is unusually large. We then establish a result on the Hausdorff dimension of the sets containing thick points.
A Visibility-based Algorithm for Multi-robot Boundary Coverage
Linan Jiao,Zhenmin Tang
International Journal of Advanced Robotic Systems , 2008,
Abstract: Cell decomposition is often used in autonomous area coverage. We propose a visibility-based decomposition algorithm for single robot boundary coverage and a corresponding multi-robot algorithm in unknown environment. A graph data structure is exploited for completeness of coverage and incremental description of partially observed world. Visibility-based decomposition facilitates the construction of graph and algorithms operated on it. In the context of multi-robot, a dynamically selected highest priority robot is in charge of information share and synchrony through communication, polygon set operations provide tools for environmental information mergence, a distributed algorithm for multi-robot boundary coverage is proposed based on those technologies. Finally the experimental results show the relationships between robot number and traversable gate number, some future subjects of researches are introduced.
Gaussian Free Fields and KPZ Relation in R^4
Linan Chen,Dmitry Jakobson
Mathematics , 2012,
Abstract: This work aims to extend part of the two dimensional results of Duplantier and Sheffield on Liouville quantum gravity to four dimensions, and indicate possible extensions to other even-dimensional spaces R^(2n) as well as Riemannian manifolds. Let "\Theta" be the Gaussian free field on R^4 with the underlying Hilbert space being the Sobolev space H^2 witb the inner product determined by the operator (I-\Delta)^2. Assume "\theta" is a generic element from \Theta. We consider a sequence of random Borel measures on R^4, each of which is absolutely continuous with respect to the Lebesgue measure dx and the density function is given by the exponential of a centered Gaussian family parametrized by x in R^4. We show that with probability 1, this sequence of measures weakly converges to a limit random measure which can be "formally" written as "exp(2\gamma\theta(x)dx". In this setting, we also prove a KPZ relation, which is the quadratic relation between the scaling exponent of a bounded Borel set on R^4 under the Lebesgue measure and its counterpart under the random measure obtained above. Our approach is similar to the one used by Duplantier and Sheffield in 2D but with adaptations to R^4.
The Study on the Process and Impact of External-Care-Seeking Behavior in Shanghai  [PDF]
Chunlin Jin, Linan Wang, Shanlian Hu, Changying Wang, Fen Li
Open Journal of Preventive Medicine (OJPM) , 2015, DOI: 10.4236/ojpm.2015.53012
Abstract: Objectives: To evaluate the impact of external-care-seeking, explore the framework to regulate patients’ seeking doctor behavior and to promote better medical resources allocation. Methods: Obtaining data from regular reports from public medical institutions in Shanghai, comparing patients who seek doctors from out-of-Shanghai residence and local patients with insurance in terms of the quantity of service, types of diseases, medical expenses, etc. Results: External-care-seeking has a large quantity, especially in hospitalization. In 2012, the number of discharged population from out-of-Shanghai accounted for 22.74% of the total discharged number, the proportion even higher than 30% in tertiary hospitals. Tertiary hospitals have a significant attraction effect, concentrating 59.42% of the outpatient and emergency visits and 71.82% of the amount of hospitalization, with corresponding cost of 75.86% and 82.56%. The top three divisions in tertiary hospitals for external-care-seeking were surgical, obstetrics and gynecology, internal medicine. Based on the interview, admitting out-of-shanghai patients is conducive to the improvement of the technical level of hospitals, and to the enhancement of the utilization efficiency of health resource. However, the local residents may have less accessibility of high quality of medical service. The average expense of external-care-seeking is higher than that of local patients happened in the same level of hospitals. Conclusions: External-care-seeking will have a more far-reaching impact on the health care system in Shanghai; some interventions might be necessary, such as rationally allocating medical resources based on the estimates of external-care-seeking and establishing a medical service supervision mechanism.
Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge  [PDF]
Jianlong Hu, Xiaosong Yang, Linan Shao, Xuwen He, Kunkuo Men
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.32006
Abstract:

Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increased by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increased from 0.125 mol/L to 0.25 mol/L, the qm of ATSS for Pb decreased from 1.05 mmol/g to 0.84 mmol/g. However, when the NaOH concentration increased from 0.25 mol/L to 7.5 mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of -N-H groups and -COOH groups.

Effect of Pyrolysis Temperature on the Electrical Behavior of Polymer-Derived SiOCN Ceramic  [PDF]
Yan Li, Yuxi Yu, Haisheng San, Qingkai Han, Linan An
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.310002
Abstract: The conductivity of polymer-derived SiOCN ceramics exhibited an Arrhenius dependence on pyrolysis temperature, with the activation energy of ~3.95 eV. The formation and structure change of the free carbon phase were detected by means of electron spin resonance spectroscopy and X-ray photoelectron spectroscopy. It reveals that the number of dangling bonds on the free carbon is increased as pyrolysis temperature increases, with the activation energy of ~3.87 eV. So it is demonstrated that the pyrolysis-temperature induced increase in the conductivity is mainly attributed to the increase of dangling on the graphite-like carbon.
DEFORMATION BEHAVIOR AND CONSTITUTIVE EQUATION FOR Zr55Cu30Al10Ni5 BULK METALLIC GLASS IN SUPERCOOLED LIQUID REGION

ZHANG Linan,CHEN Qi,LIU Lin,

金属学报 , 2009,
Abstract: The compressive deformation of the Zr55Cu30Al10Ni5 bulk metallic glass (BMG) was investigated in the supercooled region. It was found that the deformation behavior of the BMG alloy is strongly dependant on strain rate and temperature. The BMG exhibits Newtonian behavior at low strain rate but becomes non–Newtonian flow at high strain rate. The correlation between flow stress as well as strain rate and temperature was established in terms of stretched exponential function.
Video Defogging Based on Adaptive Tolerance
Yu Linan,Piao Yan,Yan Xiaoyuan
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i7.1556
Abstract: Dark channel prior is a kind of statistics of the haze-free outdoor images, which is widely used in image defogging. But when the image contains a large bright region, such as sky and white object, the prior will cause color distortion in these bright regions because of the underestimated transmission. To solve this problem, a video defogging technology based on adaptive tolerance is presented in this paper, and it is applied to video defogging by combining with the guided filter. First, the transmission of each video frame is estimated according to the dark channel prior, and then it is fast refined by the guided filter for restoration. If a large bright region exists in the video frame, the transmission of these regions will be corrected according to the adaptive tolerance, which avoids the color distortion in the video defogging. For the video of dynamic scenes which are caused by camera motion, each frame is defogged as a single image. But for the video of static scenes whose background is almost invariant, the transmission of the background is estimated and used for the defogging of all the frames instead of estimating the transmission of each frame. In this way, the rate of video defogging is greatly improved. Experimental results show that the algorithm has a strong applicability, and the proposed method can be further used for many applications, such as outdoor surveillance, remote sensing and intelligent vehicles.
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