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Search Results: 1 - 10 of 113036 matches for " Yingchao Zhang and Zhiyong Fan "
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Fault detection and estimation for non-Gaussian stochastic systems with time varying delay
Kai Hu,, AiGuo Song, WeiLiang Wang, Yingchao Zhang and Zhiyong Fan
Advances in Difference Equations , 2013, DOI: 10.1186/1687-1847-2013-22
Abstract: In this paper, fault detection and estimation problem is studied for non-Gaussian stochastic systems with time varying delay. A new approach based on the output probability density function (PDF) and observers technique to detect and estimate time varying faults is presented. Some slack variables and scalars are introduced to design observers’ parameters, which can provide more degrees of freedom. A particle distribution example is given to illustrate the design procedures, and the simulation results show the performance of the proposed approaches.
Harmonious Tourism Environment and Tourists Perception: An Empirical Study of Mountain-Type World Cultural Heritage Sites in China  [PDF]
Zhiyong Fan, Sheng Zhong, Wei Zhang
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.51012
Abstract: This study tested the structural equation model between harmonious tourism environment perception and tourists’ loy- alty. In this paper, a model is erected to indicate the relationship between harmonious tourism environment perception and tourists’ loyalty. With 377 valid questionnaires from 8 mountain-type world cultural heritage sites in China, the author tested the model by SPSS and AMOS. It was found that the perception of natural ecosystem was the most influential factor affecting tourists’ entire environment perception, social relations system was the second place and cultural ecosystem was the third place. The entire harmonious tourism environment perception also greatly determines tourists’ loyalty. At last, some suggestions were given to make tourism destination develop sustainably based on this study.
Co-adsorption behavior of methylene blue(MB) and Cr(Ⅲ) on synthesized zeolite from fly ash: Ⅰ.Adsorption kinetics and thermodynamics
粉煤灰基沸石对亚甲基蓝和Cr(Ⅲ)的共吸附行为——Ⅰ. 吸附动力学和吸附热力学

Fan Chunhui,Zhang Yingchao,Hua Li,
范春辉
,张颖超,花莉

环境工程学报 , 2012,
Abstract: 以粉煤灰为原料,采用优化改进的水热晶化一步法合成沸石。借助FTIR、XRD和SEM对沸石理化特性进行表征,分析水中双组分污染物亚甲基蓝(MB)和Cr(Ⅲ)的共吸附去除特性。结果表明,合成沸石产物呈菱形或多面体形,在XRD图谱中可见NaP1型沸石特征峰。共吸附过程为准二级反应,以化学吸附为速率控制步骤。Langmuir和Freundlich等温线方程都能有效地描述反应过程,298 K条件下,沸石对MB和Cr(Ⅲ)的理论最大吸附量分别为7.8186 mg/g和8.8889 mg/g。吸附过程自发、吸热,反应后体系自由度降低,推测吸附位点的直接竞争为MB和Cr(Ⅲ)去除的主导机制之一。
Performance Analysis of Doubly Excited Brushless Generator with Outer Rotor for Wind Power Application
Yingchao Zhang
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i3.606
Abstract: In this paper, a novel doubly excited brushless generator (DEBG) with outer radial laminated magnetic barrier rotor (RLMB-rotor) for wind power application was designed and analyzed. The DEBG has 10 rotor pole numbers with outer rotor. Its performance is investigated using the 2D transient finite element method. The magnetic fields, torque capability, end winding voltage characteristics, radial magnetic force and energy efficiency were analyzed. All studies in this paper show that the simplicity, reliability, high efficiency and low vibration and noise of the DEBG with outer rotor are attractive for variable speed constant frequency (VSCF) wind power generation system.
Ortho-hydroxy assisted and copper-catalyzed oxidation of benzylic alcohol
ChangFeng Wan,JinMin Fan,JinTang Zhang,ZhiYong Wang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3066-y
Abstract: An efficient and simple protocol for the synthesis of o-hydroxyarylketones has been developed. The reaction proceeds smoothly with catalytic amounts of copper catalyst under air atmosphere without ligands. This study indicates that the o-hydroxy plays an important role in the oxidation of alcohol to the corresponding carbonyl compounds.
Energy-Efficient Scheduling with Time and Processors Eligibility Restrictions
Xibo Jin,Fa Zhang,Ying Song,Liya Fan,Zhiyong Liu
Computer Science , 2013,
Abstract: While previous work on energy-efficient algorithms focused on assumption that tasks can be assigned to any processor, we initially study the problem of task scheduling on restricted parallel processors. The objective is to minimize the overall energy consumption while speed scaling (SS) method is used to reduce energy consumption under the execution time constraint (Makespan $C_{max}$). In this work, we discuss the speed setting in the continuous model that processors can run at arbitrary speed in $[s_{min},s_{max}]$. The energy-efficient scheduling problem, involving task assignment and speed scaling, is inherently complicated as it is proved to be NP-Complete. We formulate the problem as an Integer Programming (IP) problem. Specifically, we devise a polynomial time optimal scheduling algorithm for the case tasks have a uniform size. Our algorithm runs in $O(mn^3logn)$ time, where $m$ is the number of processors and $n$ is the number of tasks. We then present a polynomial time algorithm that achieves an approximation factor of $2^{\alpha-1}(2-\frac{1}{m^{\alpha}})$ ($\alpha$ is the power parameter) when the tasks have arbitrary size work. Experimental results demonstrate that our algorithm could provide an efficient scheduling for the problem of task scheduling on restricted parallel processors.
OS4M: Achieving Global Load Balance of MapReduce Workload by Scheduling at the Operation Level
Liya Fan,Bo Gao,Fa Zhang,Zhiyong Liu
Computer Science , 2014,
Abstract: The efficiency of MapReduce is closely related to its load balance. Existing works on MapReduce load balance focus on coarse-grained scheduling. This study concerns fine-grained scheduling on MapReduce operations, with each operation representing one invocation of the Map or Reduce function. By default, MapReduce adopts the hash-based method to schedule Reduce operations, which often leads to poor load balance. In addition, the copy phase of Reduce tasks overlaps with Map tasks, which significantly hinders the progress of Map tasks due to I/O contention. Moreover, the three phases of Reduce tasks run in sequence, while consuming different resources, thereby under-utilizing resources. To overcome these problems, we introduce a set of mechanisms named OS4M (Operation Scheduling for MapReduce) to improve MapReduce's performance. OS4M achieves load balance by collecting statistics of all Map operations, and calculates a globally optimal schedule to distribute Reduce operations. With OS4M, the copy phase of Reduce tasks no longer overlaps with Map tasks, and the three phases of Reduce tasks are pipelined based on their operation loads. OS4M has been transparently incorporated into MapReduce. Evaluations on standard benchmarks show that OS4M's job duration can be shortened by up to 42%, compared with a baseline of Hadoop.
Improving the Load Balance of MapReduce Operations based on the Key Distribution of Pairs
Liya Fan,Bo Gao,Xi Sun,Fa Zhang,Zhiyong Liu
Computer Science , 2014,
Abstract: Load balance is important for MapReduce to reduce job duration, increase parallel efficiency, etc. Previous work focuses on coarse-grained scheduling. This study concerns fine-grained scheduling on MapReduce operations. Each operation represents one invocation of the Map or Reduce function. Scheduling MapReduce operations is difficult due to highly screwed operation loads, no support to collect workload statistics, and high complexity of the scheduling problem. So current implementations adopt simple strategies, leading to poor load balance. To address these difficulties, we design an algorithm to schedule operations based on the key distribution of intermediate pairs. The algorithm involves a sub-program for selecting operations for task slots, and we name it the Balanced Subset Sum (BSS) problem. We discuss properties of BSS and design exact and approximation algorithms for it. To transparently incorporate these algorithms into MapReduce, we design a communication mechanism to collect statistics, and a pipeline within Reduce tasks to increase resource utilization. To the best of our knowledge, this is the first work on scheduling MapReduce workload at this fine-grained level. Experiments on PUMA [T+12] benchmarks show consistent performance improvement. The job duration can be reduced by up to 37%, compared with standard MapReduce.
Integration of Social Resources: Joint Command System in Large-Scale Emergencies  [PDF]
Xiangtao Yan, Zhiyong Zhang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.212012
Abstract: Command system is the core part in responding large-scale emergencies. Central government needs to integrate social resources in constructing command system rapidly. Social resources from military, enterprises, government and non-government organization should be integrated in command system which includes situational awareness system, communication system and decision system. The architectures of these systems are described in turn. Military command system should be the main part and backbone in large-scale emergencies.
FTY720 Protects Cardiac Microvessels of Diabetes: A Critical Role of S1P1/3 in Diabetic Heart Disease
Zhiyong Yin, Linni Fan, Liping Wei, Haokao Gao, Rongqing Zhang, Ling Tao, Feng Cao, Haichang Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042900
Abstract: Background: Diabetes is associated with an increased risk of cardiac microvascular disease. The mechanisms by which this damage occurs are unknown. However, research suggests that signaling through the sphingosine-1-phosphates receptor 1 and 3 (S1P1/3) by FTY720, a sphiongolipid drug that is structually similar to SIP, may play a role in the treatment on cardiac microvascular dysfunction in diabetes. We hypothesized that FTY720 might exert the cardioprotective effects of S1P1 and S1P3 viaprotein kinase C-beta (PKCβ II) signaling pathway. Methodology/Principal Findings: Transthoracic echocardiography was performed to detect the change of cardiac function. Scanning and transmission electron microscope with lanthanum tracer were used to determine microvascular ultrastructure and permeability in vivo. Apoptosis was detected by TUNEL and CD31 dual labeling in paraffin-embedded sections. Laser capture miscrodissection was used to assess cardiac micovascular endothelial cells (CMECs) in vivo. RT-PCR and Western blot analysis were used to determine the mRNA levels and protein expression of S1P1, S1P3, and PKCβ II. In the diabetic rats vs. controls, cardiac capillaries showed significantly higher density; CD31 positive endothelial cells were significantly reduced; the apoptosis index of cardiac endothlial cells was significantly higher. And FTY720 could increase the expressional level of S1P1 and boost S1P3 trasnslocation from membrane to nuclear, then ameliorate cardiac microvascular barrier impairment and pathologic angiogenesis induced by diabetes. In addition, overexpression of PKCβ II significantly decreased the protective effect of FTY720. Conclusions: Our study represents that the deregulation of S1P1 and S1P3 is an important signalresponsible for cardiac microvascular dysfunction in diabetes. FTY720 might be competent to serve as a potential therapeutic approach for diabetic heart disease through ameliorating cardiac microvascular barrier impairment and pathologic angiogenesis, which might be partly dependent on PKCβII-mediated signaling pathway.
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