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Search Results: 1 - 10 of 152990 matches for " WANG Hong-Qiang "
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Heating mechanism affects equipartition in a binary granular system
Hong-Qiang Wang,Narayanan Menon
Physics , 2007, DOI: 10.1103/PhysRevLett.100.158001
Abstract: Two species of particles in a binary granular system typically do not have the same mean kinetic energy, in contrast to the equipartition of energy required in equilibrium. We investigate the role of the heating mechanism in determining the extent of this non-equipartition of kinetic energy. In most experiments, different species of particle are unequally heated at the boundaries. We show by event-driven simulations that this differential heating at the boundary influences the level of non-equipartition even in the bulk of the system. This conclusion is fortified by studying a numerical model and a solvable stochastic model without spatial degrees of freedom. In both cases, even in the limit where heating events are rare compared to collisions, the effect of the heating mechanism persists.
CorSig: A General Framework for Estimating Statistical Significance of Correlation and Its Application to Gene Co-Expression Analysis
Hong-Qiang Wang, Chung-Jui Tsai
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077429
Abstract: With the rapid increase of omics data, correlation analysis has become an indispensable tool for inferring meaningful associations from a large number of observations. Pearson correlation coefficient (PCC) and its variants are widely used for such purposes. However, it remains challenging to test whether an observed association is reliable both statistically and biologically. We present here a new method, CorSig, for statistical inference of correlation significance. CorSig is based on a biology-informed null hypothesis, i.e., testing whether the true PCC (ρ) between two variables is statistically larger than a user-specified PCC cutoff (τ), as opposed to the simple null hypothesis of ρ = 0 in existing methods, i.e., testing whether an association can be declared without a threshold. CorSig incorporates Fisher's Z transformation of the observed PCC (r), which facilitates use of standard techniques for p-value computation and multiple testing corrections. We compared CorSig against two methods: one uses a minimum PCC cutoff while the other (Zhu's procedure) controls correlation strength and statistical significance in two discrete steps. CorSig consistently outperformed these methods in various simulation data scenarios by balancing between false positives and false negatives. When tested on real-world Populus microarray data, CorSig effectively identified co-expressed genes in the flavonoid pathway, and discriminated between closely related gene family members for their differential association with flavonoid and lignin pathways. The p-values obtained by CorSig can be used as a stand-alone parameter for stratification of co-expressed genes according to their correlation strength in lieu of an arbitrary cutoff. CorSig requires one single tunable parameter, and can be readily extended to other correlation measures. Thus, CorSig should be useful for a wide range of applications, particularly for network analysis of high-dimensional genomic data. Software Availability A web server for CorSig is provided at R code for CorSig is freely available for non-commercial use at http://aspendb.uga.edu/downloads.
Particle kinematics in a dilute, 3-dimensional, vibration-fluidized granular medium
Hong-Qiang Wang,Klebert Feitosa,Narayanan Menon
Physics , 2009, DOI: 10.1103/PhysRevE.80.060304
Abstract: We report an experimental study of particle kinematics in a 3-dimensional system of inelastic spheres fluidized by intense vibration. The motion of particles in the interior of the medium is tracked by high speed video imaging, yielding a spatially-resolved measurement of the velocity distribution. The distribution is wider than a Gaussian and broadens continuously with increasing volume fraction. The deviations from a Gaussian distribution for this boundary-driven system are different in sign and larger in magnitude than predictions for homogeneously driven systems. We also find correlations between velocity components which grow with increasing volume fraction.
Suture Pull-Through Insertion Techniques for Descemet Stripping Automated Endothelial Keratoplasty in Chinese Phakic Eyes: Outcomes and Complications
Ying Hong, Rong-mei Peng, Miao Wang, Hong-qiang Qu, Jing Hong
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061929
Abstract: Purpose To investigate the outcomes and complications of suture pull-through insertion techniques for Descemet stripping automated endothelial keratoplasty (DSAEK) in Chinese phakic eyes. Patients and Methods Retrospective case series. Included in the study were all Chinese patients with phakic eyes who underwent DSAEK at Peking University Third Hospital from August 2008 to August 2011. All ocular diseases of the patients were recorded. Distance visual acuity (DVA), near visual acuity (NVA), intraocular pressure (IOP), anterior chamber depth (ACD), central corneal thickness (CCT), and corneal endothelial cell density (ECD) were compared prior to and 12 months after DSAEK. The DSAEK success rate, endothelial cell loss (ECL), complications, and prognosis were analyzed. All patients had at least 12 months of follow up. Results Twenty-one eyes of 16 patients were included (11 males and 5 females). Ages ranged from 2 to 47 years with an average age of 29.8 years. The average follow up was 15.4 months (ranging from 12 to 36 months). Diagnoses included 7 eyes (4 patients) with corneal endothelial dystrophy and 14 eyes (12 patients) with bullous keratopathy. Presurgical DVA and NVA (LogMAR) were 1.7±0.7 and 1.2±0.4; postsurgical DVA and NVA were 0.8±0.6 and 0.7±0.5; Z = ?3.517, ?2.764; P<0.001 and P = 0.006 respectively. Presurgical IOP was 15.8±3.7 mm Hg; postsurgical IOP was 15.2±2.6 mm Hg; Z = ?0.505, P = 0.614. Presurgical ACD was 3.00±0.74 mm; postsurgical ACD was 2.72±0.59 mm; Z = ?0.524, P = 0.600. Donor ECD was 2992±163 cells/mm2, ECD was 1836±412 cells/mm2 with a 12-month postsurgical ECL of 39%. Success rate was 86%. Surgery complications included pupillary block-induced hypertension in 5 eyes (24%), graft detachment in 3 eyes (14%), and graft dislocation in 1 eye (5%). Conclusions DSAEK on Chinese phakic eyes can significantly improve DVA and NVA by preserving the patient’s own crystalline lens. DSAEK is an optional surgery for patients who need to preserve accommodative function. More attention should be given to postsurgical pupillary block-induced hypertension.
Efficient Adaptive Detection Threshold Optimization for Tracking Maneuvering Targets in Clutter
Jian-Tao Wang;Hong-Qiang Wang;Yu-Liang Qin;Zhaowen Zhuang
PIER B , 2012, DOI: 10.2528/PIERB12041701
Abstract: In this paper, we focus on the adaptive prior detection threshold setting problem to optimize the overall performance of the joint detection-tracking system for maneuvering target tracking in clutter. It is shown that our problem can be reduced to the information reduction factor (IRF) maximization by Gaussian fitting of maneuvering target Markovian switching dynamics via moment matching, even for the case with the nonlinear measurement equation. Our proposed adaptive threshold setting method outperforms the conventional threshold setting approaches greatly and also exhibits a mildly improvement in comparison with the earlier method for this problem in terms of tracking performance, especially in track loss percentage (TLP). However the computational burden of our method is reduced significantly because in our method generally only one IRF corresponding to the common validation region, not the every IRF corresponding to the individual model-conditioned validation region, is needed for threshold optimization at each time step and an approximate closed-form solution can also be obtained for the special case of the Neyman-Pearson (NP) detector.
Index System for Selection of Strategic Petroleum Reserve Bases

LI Hong-qiang,WANG Li-mao,

资源科学 , 2008,
Abstract: Site selection is the first step for establishing a strategic petroleum reserve (SPR). The paper presents an original process model for the circulation of strategic petroleum reserves. The factors affecting site selection for SPR bases include 4 categories: reliability and security, convenience of transport, natural site advantages and availability for utilization. An index system for site selection of SPR bases was established based on the analysis of these factors, with a total of 16 practical indexes. The weight of each index was determined using mathematical methods such as Delphi and Analytic Hierarchy Process (AHP). Zhenhai, Huangdao, Huai'an, Lanzhou and Chongqing were chosen as potential sites and evaluated using the index system. The results show that Zhenhai has the highest index value and therefore is the most attractive site, followed by Huangdao, Lanzhou, Chongqing, and Huai'an in that order. The coastal sites of Zhenhai and Huangdao clearly have higher values for SPR utilization than the inland sites of Huai'an, Lanzhou and Chongqing. In terms of storage method, Huai'an, where petroleum is stored underground, is ranked as the least appropriate strategic reserve location, which suggests that there is no clear advantage to China's existing underground storage facilities. Thus, it makes sense that the first group of sites selected for China's strategic petroleum reserve consisted of coastal sites with above-ground storage facilities. In comparing the results of this study with the SPR bases that have currently been chosen, we can confirm the feasibility and rationality of our index system, which may be a useful tool for future use in site selection.
Rotating Parabolic-Reflector Antenna Target in SAR Data: Model, Characteristics, and Parameter Estimation
Bin Deng,Hong-Qiang Wang,Yu-Liang Qin,Sha Zhu
International Journal of Antennas and Propagation , 2013, DOI: 10.1155/2013/583865
Broadly Tunable SOA-Based Active Mode-Locked Fibre Ring aser by Forward Injection Optical Pulse

YAN Shuang-Yi,ZHANG Jian Guo,ZHAO Wei,LU Hong-Qiang,WANG Wei-Qiang,

中国物理快报 , 2008,
Abstract: We present a broadly tunable active mode-locked fibre ring laser based on a semiconductor optical amplifier (SOA), with forward injection optical pulses. The laser can generate pulse sequence with pulsewidth about 12ps and high output power up to 8.56dBm at 2.5GHz stably. Incorporated with a wavelength-tunable optical bandpass filter, the pulse laser can operate with a broad wavelength tunable span up to 37nm with almost constant pulsewidth. A detailed experimental analysis is also carried out to investigate the relationship between the power of the internal cavity and the pulsewidth of the output pulse sequence. The experimental configuration of the pulse laser is very simple and easy to setup with no polarization-sensitive components.
Interacting Multiple Model Algorithm with Adaptive Markov Transition Probabilities

Luo Xiao-bing,Wang Hong-qiang,Li Xiang,
,王宏强,黎 湘

电子与信息学报 , 2005,
Abstract: A estimator of the time-varying Markov state transition probabilities is presented , which is based on the measurements. Then the Parameter Adaptive Interacting Multiple Model (PAIMM) is designed by adopting the above estimator. In comparison with that of the conventional IMM algorithm , the tracking performance of PAIMM is better in the simulation of tracking a maneuvering target.
Study on ATR-Oriented EM Scattering from Planar Slotted Array Antenna

Cheng Yong-qiang,Qin Yu-liang,Wang Hong-qiang,Li Xiang,

电子与信息学报 , 2008,
Abstract: In order to satisfy some special demands for detection and recognition to the guiding radar of Air Defense Missile Weapon System (ADMWS) using an active radar seeker, an analysis method of planar slotted array antennal RCS is stressly studied based on the theory of the antennal electromagnetic scattering mechanism. An electromagnetic scattering model of the antennas is established, and it introduces the detailed calculation procedure. The influences to antennas’ RCS of factors such as antenna size, frequency and quantity of slot etc are detailedly discussed. The simulation result shows that RCS of radar antenna is biggish and possesses obvious periodicity, and the range characteristic and period characteristic can be regarded the important basis of recognition. The work is meaningful for the research on detection and recognition algorithm for ground-based radar stations.
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