Ping An - Academia.edu (original) (raw)

Papers by Ping An

2012 IEEE 11th International Conference on Signal Processing, 2012

ABSTRACT In this paper, three speech corpora were established, three nonlinear features based on ... more ABSTRACT In this paper, three speech corpora were established, three nonlinear features based on Teager Energy Operator and two linear features for emotion recognition were researched. HMM-based emotion recognition was used to evaluate the emotional recognition performance of features based on Teager energy operator. The results show that performance of two features, i.e. NFD_Mel (Nonlinear Frequency Domain based Mel-scale coefficients), AF_Mel (Amplitude-Frequency property of TEO based Mel-scale coefficients), are optimal in all the researched features. It could be therefore said that transformation of Teager Energy Operator in frequency domain, and application of amplitude-frequency property of Teager Energy Operator provide good representations of emotion styles in three speech corpora for emotion recognition.

Journal of Shanghai University (English Edition), 2011

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems. When d... more Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems. When depth maps are derived using existing depth estimation methods, the depth distortions will cause undesirable artifacts in the synthesized views. To solve this problem, a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed. First, the relationships between distortions in coded depth map and rendered view are derived. Then, a precisely 3DV quality model based depth characteristics is develop for the synthesized virtual views. Finally, based on D-3DV model, a multilateral filtering is applied as a pre-processed filter to reduce rendering artifacts. The experimental results evaluated by objective and subjective methods indicate that the proposed D-3DV model can reduce bit-rate of depth coding and achieve better rendering quality.

2011 3DTV Conference: The True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON), 2011

Multi-view depth estimation is an important part in the virtual view synthesis and depth map codi... more Multi-view depth estimation is an important part in the virtual view synthesis and depth map coding within the 3DV/FTV applications. However, existing depth estimation methods generally have difficulty to generate good depth results around object edges or in areas with less texture. To solve this problem, we propose an improved algorithm to obtain a smooth and accurate depth map for view synthesis in D video coding. The proposed method aims to preserve details in the depth map and simultaneously smooth depths in object boundary occluded area, less texture and discontinuity regions, to avoid blurring in the synthesized views. Experimental results show a significant improvement of the initial input depth maps and coding efficiency, as well as a reduction of view synthesis artifacts.

2010 International Conference on Audio, Language and Image Processing, 2010

ABSTRACT

Quaternary International, 2015

Journal of human virology

The inter- and intrapatient genetic variation of GB virus C (GBV-C)/hepatitis G virus (HGV) was i... more The inter- and intrapatient genetic variation of GB virus C (GBV-C)/hepatitis G virus (HGV) was investigated to characterize the molecular epidemiologic profile of GBV-C/ HGV infection in China, an area endemic for viral hepatitis. The intrapatient variation of hepatitis C virus (HCV) from the same patients was compared to that of GBV-C/HGV. GB virus C/HGV RNA was amplified by polymerase chain reaction in 88 patients with hepatitis C, hepatitis B or presumed non-A-E hepatitis from three cities in China. Five clones of the GBV-C/HGV NS3 region were sequenced from each GBV-C/HGV RNA-positive patient. The corresponding region of HCV was also sequenced from patients co-infected with HCV. Representative sequences of the GBV-C/HGV NS3 region from each patient and those of isolates from other continents were subjected to phylogenetic analyses. GB virus C/HGV was detected in 22 (25.25%) of 88 patients: 9 (21.4%) of 42 patients with presumed non-A-E hepatitis, 10 (27.7%) of 36 patients with ...

2011 International Conference on Electrical and Control Engineering, 2011

ABSTRACT Digital teaching and learning enhances educational experience for students. Multimedia c... more ABSTRACT Digital teaching and learning enhances educational experience for students. Multimedia courseware, especially animated courseware, plays a critical role in digital teaching and learning of the course of Digital Image Processing. In this paper, three categories of animations for the course are designed, including PowerPoint Custom Animations, audio video interleaved (AVI) animations, and graphics interchange format (GIF) animations. The animation design is described in details using image registration, a crucial and intricate part of the course, as an example. The animations are helpful in illuminating concepts and illustrating methods of image registration.

Lecture Notes in Computer Science, 2003

PLoS genetics, 2011

Chromosome 3p21-22 harbors two clusters of chemokine receptor genes, several of which serve as ma... more Chromosome 3p21-22 harbors two clusters of chemokine receptor genes, several of which serve as major or minor coreceptors of HIV-1. Although the genetic association of CCR5 and CCR2 variants with HIV-1 pathogenesis is well known, the role of variation in other nearby chemokine receptor genes remain unresolved. We genotyped exonic single nucleotide polymorphisms (SNPs) in chemokine receptor genes: CCR3, CCRL2, and CXCR6 (at 3p21) and CCR8 and CX3CR1 (at 3p22), the majority of which were non-synonymous. The individual SNPs were tested for their effects on disease progression and outcomes in five treatment-naïve HIV-1/AIDS natural history cohorts. In addition to the known CCR5 and CCR2 associations, significant associations were identified for CCR3, CCR8, and CCRL2 on progression to AIDS. A multivariate survival analysis pointed to a previously undetected association of a non-conservative amino acid change F167Y in CCRL2 with AIDS progression: 167F is associated with accelerated progre...

Virology, 2006

TRIM5α acts on several retroviruses, including human immunodeficiency virus (HIV-1), to restrict ... more TRIM5α acts on several retroviruses, including human immunodeficiency virus (HIV-1), to restrict cross-species transmission. Using natural history cohorts and tissue culture systems, we examined the effect of polymorphism in human TRIM5α on HIV-1 infection. In African Americans, the frequencies of two non-coding SNP variant alleles in exon 1 and intron 1 of TRIM5 were elevated in HIV-1-infected persons compared with uninfected subjects. By contrast, the frequency of the variant allele encoding TRIM5α 136Q was relatively elevated in uninfected individuals, suggesting a possible protective effect. TRIM5α 136Q protein exhibited slightly better anti-HIV-1 activity in tissue culture than the TRIM5α R136 protein. The 43Y variant of TRIM5α was less efficient than the H43 variant at restricting HIV-1 and murine leukemia virus infections in cultured cells. The ancestral TRIM5 haplotype specifying no observed variant alleles appeared to be protective against infection, and the corresponding wild-type protein partially restricted HIV-1 replication in vitro. A single logistic regression model with a permutation test indicated the global corrected P value of < 0.05 for both SNPs and haplotypes. Thus, polymorphism in human TRIM5 may influence susceptibility to HIV-1 infection, a possibility that merits additional evaluation in independent cohorts.

Proceedings of the National Academy of Sciences, 2002

RANTES (regulated on activation normal T cell expressed and secreted), a ligand for the CC chemok... more RANTES (regulated on activation normal T cell expressed and secreted), a ligand for the CC chemokine receptor 5, potently inhibits HIV-1 replicationin vitro. We tested the influence of fourRANTESsingle nucleotide polymorphism (SNP) variants and their haplotypes on HIV-1 infection and AIDS progression in five AIDS cohorts. Three SNPs in theRANTESgene region on chromosome 17 (403Ain the promoter,In1.1Cin the first intron, and3′222Cin the 3′ untranslated region) are associated with increased frequency of HIV-1 infection. The commonIn1.1CSNP allele is nested within an intronic regulatory sequence element that exhibits differential allele binding to nuclear proteins and a down-regulation of gene transcription. TheIn1.1Callele or haplotypes that includeIn1.1Cdisplay a strong dominant association with rapid progression to AIDS among HIV-1-infected individuals in African-American, European-American, and combined cohorts. The principalRANTESSNP genetic influence on AIDS progression derives f...

Physiologia Plantarum, 2005

The effects of silicon application on the drought tolerance of sorghum (Sorghum bicolor (L.) Moen... more The effects of silicon application on the drought tolerance of sorghum (Sorghum bicolor (L.) Moench) were investigated for two cultivars differing in drought susceptibility. Silicon application ameliorated the decrease in dry weight under drought stress conditions, but had no effect on dry matter production under wet conditions. Under dry conditions, silicon‐applied sorghum had a lower shoot to root (S/R) ratio, indicating the facilitation of root growth and the maintenance of the photosynthetic rate and stomatal conductance at a higher level compared with plants grown without silicon application. The diurnal determination of the transpiration rate indicated that the silicon‐applied sorghum could extract a larger amount of water from drier soil and maintain a higher stomatal conductance. Very similar effects of silicon application were observed for both cultivars regardless of their drought susceptibility. These results suggest that silicon application may be useful to improve the d...

Pediatric Research, 2010

Dominant mutations in coding regions of the surfactant protein-C gene, SFTPC, cause respiratory d... more Dominant mutations in coding regions of the surfactant protein-C gene, SFTPC, cause respiratory distress syndrome (RDS) in infants. However, the contribution of variants in noncoding regions of SFTPC to pulmonary phenotypes is unknown. By using a case-control group of infants Ն34 weeks gestation (n ϭ 538), we used complete resequencing of SFTPC and its promoter, genotyping, and logistic regression to identify 80 single nucleotide polymorphisms (SNPs). Three promoter SNPs were statistically associated with neonatal RDS among European descent infants. To assess the transcriptional effects of these three promoter SNPs, we selectively mutated the SFTPC promoter and performed transient transfection using MLE-15 cells and a firefly luciferase reporter vector. Each promoter SNP decreased SFTPC transcription. The combination of two variants in high linkage dysequilibrium also decreased SFTPC transcription. In silico evaluation of transcription factor binding demonstrated that the rare allele at g.Ϫ1167 disrupts a SOX (SRYrelated high mobility group box) consensus motif and introduces a GATA-1 site, at g.Ϫ2385 removes a MZF-1 (myeloid zinc finger) binding site, and at g.Ϫ1647 removes a potential methylation site. This combined statistical, in vitro, and in silico approach suggests that reduced SFTPC transcription contributes to the genetic risk for neonatal RDS in developmentally susceptible infants.

Journal of Virology, 2004

The cytosine deaminase APOBEC3G, in the absence of the human immunodeficiency virus type 1 (HIV-1... more The cytosine deaminase APOBEC3G, in the absence of the human immunodeficiency virus type 1 (HIV-1) accessory gene HIV-1 viral infectivity factor ( vif ), inhibits viral replication by introducing G→A hypermutation in the newly synthesized HIV-1 DNA negative strand. We tested the hypothesis that genetic variants of APOBEC3G may modify HIV-1 transmission and disease progression. Single nucleotide polymorphisms were identified in the promoter region (three), introns (two), and exons (two). Genotypes were determined for 3,073 study participants enrolled in six HIV-AIDS prospective cohorts. One codon-changing variant, H186R in exon 4, was polymorphic in African Americans (AA) ( f = 37%) and rare in European Americans ( f < 3%) or Europeans ( f = 5%). For AA, the variant allele 186R was strongly associated with decline in CD4 T cells (CD4 slope on square root scale: −1.86, P = 0.009), The 186R allele was also associated with accelerated progression to AIDS-defining conditions in AA. Th...

Journal of Plant Nutrition, 2005

... Malaga, , Spain View all references reported that the stem dry mass decreases to a lesser ext... more ... Malaga, , Spain View all references reported that the stem dry mass decreases to a lesser extent than leaf dry weight in the cultivated tomato, but our results showed that the extent of reduction was similar, or even larger in cv. Naomi at 70% RH (Figure 1). Under NaCl treatment ...

Journal of Plant Nutrition, 2009

ABSTRACT To clarify whether silicon application could improve root growth of rye (Secale cereale ... more ABSTRACT To clarify whether silicon application could improve root growth of rye (Secale cereale L.) under drought, a pot experiment was conducted under two soil water regimes (soil water contents were kept at 0.015–0.030 or above 0.050 g g for dry and well-watered conditions, respectively). Silicon increased dry weight of rye but did not affect shoot/root ratio under the well-watered condition, while it lowered the ratio under the dry condition. Water use and leaf water potential were increased by silicon under the well-watered condition, although photosynthetic rate, stomatal conductance and water use efficiency were not affected. Under the dry condition, silicon-supplied ryes showed higher photosynthetic rate, stomatal conductance, water use and leaf water potential than silicon-deficient ones. These results suggested that silicon increased dry matter production of ryes under drought, enabling them to allocate more assimilates to root. This resulted in lowering of the shoot/root ratio and better adaptation to drought.

JAIDS Journal of Acquired Immune Deficiency Syndromes, 2001