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Search Results: 1 - 10 of 121881 matches for " WANG Ze "
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MRF-ZOOM: A Fast Dictionary Searching Algorithm for Magnetic Resonance Fingerprinting
Ze Wang
Computer Science , 2015,
Abstract: Magnetic resonance fingerprinting (MRF) is a new technique for simultaneously quantifying multiple MR parameters using one temporally resolved MR scan. But its brute-force dictionary generating and searching (DGS) process causes a huge disk space demand and computational burden, prohibiting it from a practical multiple slice high-definition imaging. The purpose of this paper was to provide a fast and space efficient DGS algorithm for MRF. Based on an empirical analysis of properties of the distance function of the acquired MRF signal and the pre-defined MRF dictionary entries, we proposed a parameter separable MRF DGS method, which breaks the multiplicative computation complexity into an additive one and enabling a resolution scalable multi-resolution DGS process, which was dubbed as MRF ZOOM. The evaluation results showed that MRF ZOOM was hundreds or thousands of times faster than the original brute-force DGS method. The acceleration was even higher when considering the time difference for generating the dictionary. Using a high precision quantification, MRF can find the right parameter values for a 64x64 imaging slice in 117 secs. Our data also showed that spatial constraints can be used to further speed up MRF ZOOM.
Curve Fitting of the Corporate Recovery Rates: The Comparison of Beta Distribution Estimation and Kernel Density Estimation
Rongda Chen, Ze Wang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068238
Abstract: Recovery rate is essential to the estimation of the portfolio’s loss and economic capital. Neglecting the randomness of the distribution of recovery rate may underestimate the risk. The study introduces two kinds of models of distribution, Beta distribution estimation and kernel density distribution estimation, to simulate the distribution of recovery rates of corporate loans and bonds. As is known, models based on Beta distribution are common in daily usage, such as CreditMetrics by J.P. Morgan, Portfolio Manager by KMV and Losscalc by Moody’s. However, it has a fatal defect that it can’t fit the bimodal or multimodal distributions such as recovery rates of corporate loans and bonds as Moody’s new data show. In order to overcome this flaw, the kernel density estimation is introduced and we compare the simulation results by histogram, Beta distribution estimation and kernel density estimation to reach the conclusion that the Gaussian kernel density distribution really better imitates the distribution of the bimodal or multimodal data samples of corporate loans and bonds. Finally, a Chi-square test of the Gaussian kernel density estimation proves that it can fit the curve of recovery rates of loans and bonds. So using the kernel density distribution to precisely delineate the bimodal recovery rates of bonds is optimal in credit risk management.
Linear \infty-Harmonic maps between Rienmannian manifolds
Ze-ping Wang
Mathematics , 2007,
Abstract: In this paper, we give complete classifications of linear $\infty$-harmonic maps between Euclidean and Heisenberg spaces, between Nil and Sol spaces. We also classify all $\infty$-harmonic linear endomorphisms of Sol space and show that there is a subgroup of $\infty$-harmonic linear automorphisms in the group of linear automorphisms of Sol space.
Osteoporosis Knowledge of Students in Relevant Healthcare Academic Programs
Vu H. Nguyen,Ze Wang
Journal of Osteoporosis , 2012, DOI: 10.1155/2012/383412
Abstract: For healthcare professionals who treat individuals with osteoporosis, it is vital that they receive adequate education on osteoporosis to ensure sufficient knowledge of osteoporosis to properly treat individuals with the disease. To test for adequate osteoporosis education, a study was conducted to measure osteoporosis knowledge in 206 students in relevant healthcare academic programs, such as nursing, pharmacy, physical therapy, and dietetics. The study showed that differences existed in osteoporosis knowledge in general between the programs and between different years of students in the same programs. There were also discrepancies in specific areas of osteoporosis knowledge between the classes of students, and the average scores of correctly answered items were only as high as 24.40 (76.3%) out of 32 items on osteoporosis knowledge. This study shows that students have osteoporosis knowledge and that it is not completely inadequate; however, osteoporosis knowledge could still be more sufficient, and results demonstrate the need to increase osteoporosis education in the curriculum for these healthcare academic programs to increase osteoporosis knowledge and better prepare graduates and professionals to treat individuals with the disease.
Osteoporosis Knowledge of Students in Relevant Healthcare Academic Programs
Vu H. Nguyen,Ze Wang
Journal of Osteoporosis , 2012, DOI: 10.1155/2012/383412
Abstract: For healthcare professionals who treat individuals with osteoporosis, it is vital that they receive adequate education on osteoporosis to ensure sufficient knowledge of osteoporosis to properly treat individuals with the disease. To test for adequate osteoporosis education, a study was conducted to measure osteoporosis knowledge in 206 students in relevant healthcare academic programs, such as nursing, pharmacy, physical therapy, and dietetics. The study showed that differences existed in osteoporosis knowledge in general between the programs and between different years of students in the same programs. There were also discrepancies in specific areas of osteoporosis knowledge between the classes of students, and the average scores of correctly answered items were only as high as 24.40 (76.3%) out of 32 items on osteoporosis knowledge. This study shows that students have osteoporosis knowledge and that it is not completely inadequate; however, osteoporosis knowledge could still be more sufficient, and results demonstrate the need to increase osteoporosis education in the curriculum for these healthcare academic programs to increase osteoporosis knowledge and better prepare graduates and professionals to treat individuals with the disease. 1. Introduction Osteoporosis is a skeletal disease of reduced bone mineral density (BMD) that is diagnosed as 2.5 standard deviations below the adult peak mean that compromises bone strength resulting in an increased risk of bone fracture [1]. Osteoporosis affects about 10 million Americans with additional tens of millions at risk in the United States [2], and also affects hundreds of millions of people worldwide [3]. Reduced BMD due to osteoporosis leads to an increase in bone fractures that occur most frequently fractures in the hip, spine, and wrist, and these osteoporotic fractures reduce both the quality of life [4] and quantity of life [5]. In addition, treating individuals with osteoporosis costs billions of dollars per year on the nation’s healthcare system [6] that is expected to continuously and greatly increase in the next couple of decades [7]. With the increased prevalence of osteoporosis, it is vital for healthcare professionals who work with individuals with osteoporosis to be adequately educated to have proficient knowledge of the disease and how to prevent and treat it. Healthcare professionals should receive adequate osteoporosis education in their academic programs in order to give them adequate knowledge of the disease to prepare them for treating this population. A systematic review of interventions
Involvement of Root Hair during Rhizobial Invasion in Cultivated Peanut (Arachis hypogaea L.)  [PDF]
James Maku, Liping Wang, Fengxia Liu, Lixia Liu, Karen Kelley, Ze Peng, Jianping Wang
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.98119
Abstract: Peanut root invasion by Bradyrhizobia is through a crack entry, which is different from many other legumes applying an infection thread entry in root hair. Understanding the role of root hair in the crack entry of Bradyrhizobia invasion of peanut root and subsequent peanut nodulation would facilitate improvement of biological nitrogen fixation in cultivated peanut. The objective of this study was to investigate the involvement of root hair in Bradyrhizobial invasion of peanut. Seedling roots of a nodulating peanut
Investigation of the Mechanism of Tangent Bifurcation in Current Mode Controlled Boost Converter  [PDF]
Ling-ling Xie, Ren-xi Gong, Kuang Wang, Hao-ze Zhuo
Circuits and Systems (CS) , 2011, DOI: 10.4236/cs.2011.21007
Abstract: Tangent bifurcation is a special bifurcation in nonlinear dynamic systems. The investigation of the mechanism of the tangent bifurcation in current mode controlled boost converters operating in continuous conduction mode (CCM) is performed. The one-dimensional discrete iterative map of the boost converter is derived. Based on the tangent bifurcation theorem, the conditions of producing the tangent bifurcation in CCM boost converters are deduced mathematically. The mechanism of the tangent bifurcation in CCM boost is exposed from the viewpoint of nonlinear dynamic systems. The tangent bifurcation in the boost converter is verified by numerical simulations such as discrete iterative maps, bifurcation map and Lyapunov exponent. The simulation results are in agreement with the theoretical analysis, thus validating the correctness of the theory.
Characteristics of phosphorus fractionated from the sediment resuspension in abrupt expansion flow experiments

Jun Wan,Ze Wang,Hezhong Yuan,

环境科学学报(英文版) , 2010,
Abstract: Phosphorous (P) fraction characteristics in sediment resuspension were investigated under adequately hydrodynamic conditions. Four forms of P in overlying water, including dissolved inorganic P, dissolved total P, total P, and particulate P, and six fractions of P in suspended particulate matter (SPM), including loosely sorbed P (NH4Cl-P), redox-sensitive P (BD-P), aluminum-bound P (Al- P), organic P (NaOH-nrP), calcium-bound P (Ca-P) and residual P (Res-P), were quantified, respectively. Di erent hydrodynamic conditions resulted in di erent P form changes. Four states could be ascribed: (1) P desorption by sediment and SPM, and P adsorption by overlying water; (2) P desorption by SPM, and P adsorption by overlying water; (3) P adsorption by SPM, and P desorption by overlying water; and (4) P equilibrium between SPM and overlying water. The contents of P in overlying water acquired peak values in the middle position of the vertical P distribution due to the combined actions of SPM and sediment. P fractions in SPM were in the following order: BD-P > NaOH-nrp > Ca-P > Al-P > Res-P > NH4Cl-P. BD-P in SPM frequently exchanged with P forms in overlying water. Resuspension was favorable to forming Ca-P in SPM.
2-{[4-(Pyridin-2-yl)pyrimidin-2-yl]sulfanyl}acetic acid
Lin Wang,Hua-Ze Dong
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811039791
Abstract: In the title molecule, C11H9N3O2S, the pyridine and pyrimidine rings are almost parallel [dihedral angle = 6.7 (1)°]. In the crystal, adjacent molecules are joined by O—H...N and C—H...O hydrogen bonds, leading to the formation of a sheet parallel to (10overline{2}).
MECHANISTIC STUDY OF THE CONVERSION FROM DMDFC TO DOHE IN THE LEVULINIC ACID FORMATION PROCESS BY THEORETICAL APPROACHES
Ze Wang,Weigang Lin,Wenli Song
BioResources , 2011,
Abstract: A reaction route accounting for the formation of levulinic acid from 5-hydroxymethylfuran-2-carbaldehyde was deduced on the basis of the mechanism previously offered by Horvat, to match the steps with more details. A newly deduced reaction route was proposed between two intermediate products within this mechanism, and the probabilities of the two mechanisms were compared by Gaussian 03 software. It was found that the conversion from the intermediate 2,3-dihydroxy-5-methyl-2,3-dihydro-furan-2-carbaldehyde (DMDFC) to 2,5-dioxo-hex-3-enal (DOHE) in the original mechanism has a lower net energy barrier than that in the newly deduced mechanism, and thus should be more preferred. The mechanism indicates that DMDFC is first protonized, followed by a proton shift process, and thereafter an OH- ion is added, completing the hydration process. Thereafter, an intramolecular H-shift reaction proceeds, leading to conversion to the intended intermediate product DOHE by the consecutive processes of isomerization and dehydration.
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