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Search Results: 1 - 10 of 104829 matches for " Lijun Zhang "
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A Bayesian Quantile Regression Analysis of Potential Risk Factors for Violent Crimes in USA  [PDF]
Ming Wang, Lijun Zhang
Open Journal of Statistics (OJS) , 2012, DOI: 10.4236/ojs.2012.25068
Abstract: Bayesian quantile regression has drawn more attention in widespread applications recently. Yu and Moyeed (2001) proposed an asymmetric Laplace distribution to provide likelihood based mechanism for Bayesian inference of quantile regression models. In this work, the primary objective is to evaluate the performance of Bayesian quantile regression compared with simple regression and quantile regression through simulation and with application to a crime dataset from 50 USA states for assessing the effect of potential risk factors on the violent crime rate. This paper also explores improper priors, and conducts sensitivity analysis on the parameter estimates. The data analysis reveals that the percent of population that are single parents always has a significant positive influence on violent crimes occurrence, and Bayesian quantile regression provides more comprehensive statistical description of this association.
The Application of “Bucket Law” Evolution in Sports Films Development  [PDF]
Lijun Zhang, Boyu Zhai
Advances in Physical Education (APE) , 2019, DOI: 10.4236/ape.2019.91006
Abstract: Using the evolution of?wooden barrel law?in management science, sports films can be transplanted and developed in theory. The study believes that how to reasonably use the barrel law requires us not only to understand the short board in the barrel law, but also to understand the origin of the barrel law. Not only should we understand the harm of barrel law, but we also need to know how to find short boards, mending boards and removing boards. Not only do we need to know how to lengthen the short boards in the wooden barrel, but we also need to notice whether the boards are tightly joined. The study concluded that the evolution of diameter, shape, usage and coordination, dynamic evolution, usage evolution, thickness evolution and bottom area evolution can provide a good theoretical dimension for the development of sports films. Nationalization, culture and marketization are practical explorations of this evolution and application.
Facile Synthesis of Polypyrrole/Titanate Core-Shell Nanorods and Their Electrorheological Characteristics  [PDF]
Jiexu Zhang, Ying He, Lijun Ji
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.22015
Abstract: In this work, polypyrrole (PPy)/titanate (TN) composite nanorods were successfully synthesized using cetyl trimethyl-ammonium bromide (CTAB) as a structure-directing agent by in situ chemical oxidative polymerization. The structural characterization indicated that the new composite rods were core (TN)-shell (PPy) nanostructure with the average diameter in the range of 250-300 nm. Further, this semiconducting composite can be used as a dispersed phase in silicone oil for a new electrorheological (ER) fluid, and its ER behavior was investigated under steady and oscillatory shear. It was found that the PPy/TN fluid showed typical ER characteristics under an external electric field.
Proteomic progress in studying tuberculosis from 2010 to 2011  [PDF]
Lijun Zhang, Douglas Lowrie, Honghao Zhou
Journal of Biophysical Chemistry (JBPC) , 2011, DOI: 10.4236/jbpc.2011.24045
Abstract: It is well accepted that rapid and early detection of Mycobacterium tuberculosis infection and understanding the mechanism of microbiologyhost interaction. Herein, we review the recently published papers related to TB proteomics from 2010 to 2011, including new technologies used in TB proteome research, diagnosis biomarkers of TB-associated diseases, disease pathogenesis and antigens for drug development. Through this review, we wish to offer some help for TB diagnosis and treatment.
Image Preprocessing Methods to Identify Micro-cracks of Road Pavement  [PDF]
Hui Wang, Zhang Chen, Lijun Sun
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B025
Abstract:

Standards of highway conservation and maintenance are improved gradually following the improvement of requirements of road service. Before obvious damage such as obvious cracking (blocktransverse, longitudinal ) and rutting emerge, inconspicuous distress (micro-cracks, polishing, pockmarked) is generated previously. These inconspicuous distresses may provide basis and criteria for pavement preventive maintenance. Currently most of preventive conservation measures are determined by experienced experts in maintenance and repair of road after site visits. Thus method is difficult in operation, and has a certain amount of instability as it is based on experience and personal knowledge. In this paper, camera and laser were used for automated high-speed acquisition images. Methods to preprocess pavement image are compared. The pretreatment method suitable for analyze micro-cracks picture is elected, an effective way to remove shadow is also proposed.

Application of AHP and Fuzzy theory in the Scientific Research Projects Management  [PDF]
Lu Yang, Yanhua Cao, Lijun Zhang
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.51B003
Abstract: Today, the number of scientific research projects in universities is increasing. The content and system will be more and more complex. The technology in projects will be advanced. And the cost will increase too. The project management involves various factors. More and more uncertain factors will increase the project risk of demonstrating and studying. At present, we still lack the valid means in risk identification, evaluation, control and management in universities. Therefore, the risk management study of scientific research projects has great importance and pressure. In this paper, AHP (Analytic Hierarchy Process) and fuzzy theory are applied into the scientific research projects management. We analyzed the risk factors and determined the indexes. Risk grades and the evaluation model are built. A simulation example is given. The results of our study give references to the risk control and decision of scientific research management, which can be used directly in reality. It also has reference value to other kinds of risk management.
An Improved Method to an Impulsive and Delayed Discretized Model  [PDF]
Yujing Liu, Lijun Zhang, Shujing Gao
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.71010
Abstract: In this paper, a discretized SIR model with pulse vaccination and time delay is proposed. We introduce two thresholds R* and R*, and further prove that the disease-free periodic solution is globally attractive if R* is less than unit and the disease can invade if R* is larger than unit. The numerical simulations not only illustrate the validity of our main results, but also exhibit bifurcation phenomenon. Our result shows that decreasing infection rate can put off the disease outbreak and reduce the number of infected individuals.
Observability of Boolean control networks: A unified approach based on the theories of finite automata
Kuize Zhang,Lijun Zhang
Mathematics , 2014, DOI: 10.1109/TAC.2015.2501365
Abstract: The problem on how to determine the observability of Boolean control networks (BCNs) has been open for five years already. In this paper, we propose a unified approach to determine all the four types of observability of BCNs in the literature. We define the concept of weighted pair graphs for BCNs. In the sense of each observability, we use the so-called weighted pair graph to transform a BCN to a finite automaton, and then we use the automaton to determine observability. In particular, the two types of observability that rely on initial states and inputs in the literature are determined. Finally, we show that no pairs of the four types of observability are equivalent, which reveals the essence of nonlinearity of BCNs.
Regulation of Reversible Dissociation of LHCII from PSII by Phosphorylation in Plants  [PDF]
Zhenhai Cui, Yanpeng Wang, Ao Zhang, Lijun Zhang
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.52032
Abstract:

LHCII is a crucial light-harvesting pigment/protein complex in photosystem II (PSII) supercomplex. It also participates in the light energy redistribution between photosystems and in the photoprotection via its reversible dissociation with PSII and PSI (photosystem I). This reversible detachment of LHCII is regulated by phosphorylation of its own and PSII core protein. Under low light conditions, LHCII is phosphorylated and dissociated with PSII core protein complex and combined with PSI, which balances the excitation energy between PSII and PSI; Under high light environment, the phosphorylation of PSII core proteins makes LHCII detach from PS

When Equivalence and Bisimulation Join Forces in Probabilistic Automata
Yuan Feng,Lijun Zhang
Computer Science , 2013,
Abstract: Probabilistic automata were introduced by Rabin in 1963 as language acceptors. Two automata are equivalent if and only if they accept each word with the same probability. On the other side, in the process algebra community, probabilistic automata were re-proposed by Segala in 1995 which are more general than Rabin's automata. Bisimulations have been proposed for Segala's automata to characterize the equivalence between them. So far the two notions of equivalences and their characteristics have been studied most independently. In this paper, we consider Segala's automata, and propose a novel notion of distribution based bisimulation by joining the existing equivalence and bisimilarities. Our bisimulation bridges the two closely related concepts in the community, and provides a uniform way of studying their characteristics. We demonstrate the utility of our definition by studying distribution based bisimulation metrics, which gives rise to a robust notion of equivalence for Rabin's automata.
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