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Search Results: 1 - 10 of 31773 matches for " May Chun Mei Wong "
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New variance ratio tests to identify random walk from the general mean reversion model
Kin Lam,May Chun Mei Wong,Wing-Keung Wong
Advances in Decision Sciences , 2006, DOI: 10.1155/jamds/2006/12314
Abstract: We develop some properties on the autocorrelation of the k-period returns for the general mean reversion (GMR) process in which the stationary component is not restricted to the AR(1) process but takes the form of a general ARMA process. We then derive some properties of the GMR process and three new nonparametric tests comparing the relative variability of returns over different horizons to validate the GMR process as an alternative to random walk. We further examine the asymptotic properties of these tests which can then be applied to identify random walk models from the GMR processes.
Clinical Analysis of 1048 Children with Developmental Delay
I-Chun Chen,Chia-Ling Chen,May-Kuen Wong,Chia-Ying Chung
Chang Gung Medical Journal , 2002,
Abstract: Background: Children with developmental delay (DD) have a variety of problems indevelopmental functions. The purposes of this study were to analyze theunderlying diseases and risk factors in children with different functionaldelays.Methods: We collected data on 1048 children who underwent assessments of developmentalfunction, related diseases, and risk factors. All children were classifiedinto 6 functional delay groups: cognitive, speech, motor, pervasive,global, and non-specific DDs. Differences in related diseases and risk factorsof the 6 functional delay groups were determined.Results: Most children had global (51.2%), speech (21.9%), and motor (13.9%)delays. Approximately 62.8% of children were associated with biologicalfactors (19% with genetic defects or congenital anomalies, 16.5% with centralnervous system lesions, 13.9% with prematurity/low birth body weight,and 13.4% with neonatal insult). We could not identify the risk factors in36.6% of the children. Most children with motor delay had brain/neuromusculardiseases and were associated with risks of prematurity or low birthbody weight; while most children with global delay had brain neuromusculardiseases or psychological/mental disorders and were associated with risks ofgenetic defects or congenital anomalies.Conclusion: Our findings suggest that there are heterogeneous risk factors and related diseasesin children with different kinds of functional delay.
Spectra of Discrete Schr?dinger Operators with Primitive Invertible Substitution Potentials
May Mei
Physics , 2013,
Abstract: We study the spectral properties of discrete Schr\"odinger operators with potentials given by primitive invertible substitution sequences (or by Sturmian sequences whose rotation angle has an eventually periodic continued fraction expansion, a strictly larger class than primitive invertible substitution sequences). It is known that operators from this family have spectra which are Cantor sets of zero Lebesgue measure. We show that the Hausdorff dimension of this set tends to $1$ as coupling constant $\lambda$ tends to $0$. Moreover, we also show that at small coupling constant, all gaps allowed by the gap labeling theorem are open and furthermore open linearly with respect to $\lambda$. Additionally, we show that, in the small coupling regime, the density of states measure for an operator in this family is exact dimensional. The dimension of the density of states measure is strictly smaller than the Hausdorff dimension of the spectrum and tends to $1$ as $\lambda$ tends to $0$.
Packed Supercritical Fluid Chromatography for the Analyses and Preparative Separations of Palm Oil Minor Components  [PDF]
Mei Han Ng, Yuen May Choo
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.68062
Abstract: This paper depicts a brief review on the applications of packed supercritical fluid chromatography (SFC) in palm oil analyses and purifications from early 1990s to date. Packed SFC has been used for the analyses of various palm oil components. The analytical separations have also been scaled up to preparative scale that leads to the recovery of high value components from palm oil. This review encompasses both analytical and preparative SFC in the oil palm processing.
A Randomized Controlled Neurophysiological Study of a Chinese Chan-Based Mind-Body Intervention in Patients with Major Depressive Disorder
Agnes S. Chan,Yvonne M. Y. Han,Sophia L. Sze,Queenie Y. Wong,Mei-chun Cheung
Evidence-Based Complementary and Alternative Medicine , 2013, DOI: 10.1155/2013/812096
Abstract: Our previous studies have reported the therapeutic effects of 10-session Chinese Chan-based Dejian mind-body interventions (DMBI) in reducing the intake of antidepressants, improving depressive symptoms, and enhancing the attentional abilities of patients with depression. This study aims to explore the possible neuroelectrophysiological mechanisms underlying the previously reported treatment effects of DMBI in comparison with those of cognitive behavioral therapy (CBT). Seventy-five age-, gender-, and education-matched participants with depression were randomly assigned to receive either CBT or DMBI or placed on a waitlist. Eyes-closed resting EEG data were obtained individually before and after 10 weeks. After intervention, the DMBI group demonstrated significantly enhanced frontal alpha asymmetry (an index of positive mood) and intra- and interhemispheric theta coherence in frontoposterior and posterior brain regions (an index of attention). In contrast, neither the CBT nor the waitlist group showed significant changes in EEG activity patterns. Furthermore, the asymmetry and coherence indices of the DMBI group were correlated with self-reported depression severity levels and performance on an attention test, respectively. The present findings provide support for the effects of a Chinese Chan-based mind-body intervention in fostering human brain states that can facilitate positive mood and an attentive mind. 1. Introduction Mind-body interventions focus on the interaction between the brain, the mind, and the body with the assumptions that the mind and body are interconnected and that individuals can use the mind to affect physical functioning and mental health. The use of mind-body training has received increasing interest as a complementary intervention method among psychologists and medical professionals due to its documented therapeutic effects on many psychological problems, such as anxiety [1], insomnia [2], and depression [3]. Mind-body training has also been shown to have positive effects as a complementary treatment for many physical disorders, including irritable bowel syndrome [4], chronic pain [5], and cardiovascular problems [6]. Using the mind to affect physical and mental health is a core concept of traditional Chinese medicine. Studies assessing the effect of qigong, a mind-body practice from ancient China, have demonstrated that qigong can elevate mood in elderly people with depression [7] and improve the psychological wellbeing and self-efficacy of patients with chronic physical illnesses [8]. Tai Chi-, one of the best known and widely
Tridiagonal substitution Hamiltonians
May Mei,William Yessen
Mathematics , 2013,
Abstract: We consider a family of discrete Jacobi operators on the one-dimensional integer lattice with Laplacian and potential terms modulated by a primitive invertible two-letter substitution. We investigate the spectrum and the spectral type, the fractal structure and fractal dimensions of the spectrum, exact dimensionality of the integrated density of states, and the gap structure. We present a review of previous results, some applications, and open problems. Our investigation is based largely on the dynamics of trace maps. This work is an extension of similar results on Schroedinger operators, although some of the results that we obtain differ qualitatively and quantitatively from those for the Schoedinger operators. The nontrivialities of this extension lie in the dynamics of the associated trace map as one attempts to extend the trace map formalism from the Schroedinger cocycle to the Jacobi one. In fact, the Jacobi operators considered here are, in a sense, a test item, as many other models can be attacked via the same techniques, and we present an extensive discussion on this.
Concord Patterns with Collective Nouns in Hong Kong English. With Illustrative Material from the International Corpus of English (Hong Kong Component)
Wong, May Lai-Yin
Linguistik Online , 2009,
Abstract: This corpus-based study reports on both a quantitative and qualitative account of the use of collective nouns in Hong Kong English, with particular reference to subject-verb agreement/concord patterns. Singular concord was found to be the preferred pattern among thirty-five collective nouns under interrogation in the ICE-HK corpus. It is argued that the preference for singular concord serves as a signal that Hong Kong English might be less conservative than British English in converging towards the norm of using singular concord with collective nouns across the globe.
Antagonist-mediated down-regulation of toll-like receptors increases the prevalence of human papillomavirus infection in systemic lupus erythematosus
Shui-Lian Yu, Paul KS Chan, Chun-Kwok Wong, Cheuk-Chun Szeto, Suzanne C Ho, Karine So, May MY Yu, So-Fan Yim, Tak-Hong Cheung, Martin CS Wong, Jo LK Cheung, Apple CM Yeung, Edmund K Li, Lai-Shan Tam
Arthritis Research & Therapy , 2012, DOI: 10.1186/ar3803
Abstract: Protein levels of TLRs 3, 7, 8 and 9 in cervical epithelial cells of lupus patients and controls with or without HPV infection were assessed using flow cytometry. Characteristics associated with the differential expression of TLRs in systemic lupus erythematosus (SLE) were elucidated. The effect and interferon-stimulated genes (ISGs) (ISG15 and Mx-1) gene expressions were then measured in oncogenic HeLa (HPV18), CaSki (HPV) and C33A (HPV negative) cell lines using flow cytometry and quantitative real-time PCR. Ex vivo productions of cytokines and interferon-gamma (IFN-γ) upon TLR ligands stimulations were subsequently measured using cytometric bead array and ELISA.For subjects with HPV infection, levels of TLR3 and TLR7 were significantly lower in lupus patients compared with controls. Significantly decreased TLRs 7, 8 and 9 levels were observed in HPV-negative SLE compared to healthy controls. For SLE with and without HPV infection, TLR7 and 9 levels were significantly lower in infected SLE than those in HPV-negative patients. Independent explanatory variables associated with down-regulation of TLR7 level included HPV infection and a higher cumulative dose of prednisolone; while a higher cumulative dose of hydroxychloroquine and HPV infection were associated with down-regulation of TLR9 level. In cervical cell lines, TLRs 3, 7, 8, 9 protein levels and antiviral ISG15 and Mx-1 gene expressions were inhibited in two oncogenic HPV types. Functional data showed that the induction of pro-inflammatory cytokines by TLR ligands (R837, ssRNA and ODN2395) was greatly impaired in CaSki and HeLa than C33A cells.In conclusion, prednisolone and TLR antagonist (hydroxychloroquine) may down-regulate protein levels of TLR7 and TLR9 in lupus patients, thereby decreasing the innate immune response against HPV infection. Upon infection, HPV further down-regulate TLR7 and 9 levels for viral persistence. Furthermore, reduction of nucleic acid-sensing TLRs 7, 8 and 9 in carcinogenic HPVs
Discovery of Genes Related to Insecticide Resistance in Bactrocera dorsalis by Functional Genomic Analysis of a De Novo Assembled Transcriptome
Ju-Chun Hsu, Ting-Ying Chien, Chia-Cheng Hu, Mei-Ju May Chen, Wen-Jer Wu, Hai-Tung Feng, David S. Haymer, Chien-Yu Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040950
Abstract: Insecticide resistance has recently become a critical concern for control of many insect pest species. Genome sequencing and global quantization of gene expression through analysis of the transcriptome can provide useful information relevant to this challenging problem. The oriental fruit fly, Bactrocera dorsalis, is one of the world's most destructive agricultural pests, and recently it has been used as a target for studies of genetic mechanisms related to insecticide resistance. However, prior to this study, the molecular data available for this species was largely limited to genes identified through homology. To provide a broader pool of gene sequences of potential interest with regard to insecticide resistance, this study uses whole transcriptome analysis developed through de novo assembly of short reads generated by next-generation sequencing (NGS). The transcriptome of B. dorsalis was initially constructed using Illumina's Solexa sequencing technology. Qualified reads were assembled into contigs and potential splicing variants (isotigs). A total of 29,067 isotigs have putative homologues in the non-redundant (nr) protein database from NCBI, and 11,073 of these correspond to distinct D. melanogaster proteins in the RefSeq database. Approximately 5,546 isotigs contain coding sequences that are at least 80% complete and appear to represent B. dorsalis genes. We observed a strong correlation between the completeness of the assembled sequences and the expression intensity of the transcripts. The assembled sequences were also used to identify large numbers of genes potentially belonging to families related to insecticide resistance. A total of 90 P450-, 42 GST-and 37 COE-related genes, representing three major enzyme families involved in insecticide metabolism and resistance, were identified. In addition, 36 isotigs were discovered to contain target site sequences related to four classes of resistance genes. Identified sequence motifs were also analyzed to characterize putative polypeptide translational products and associate them with specific genes and protein functions.
Is ICSI Risky?
May Y. W. Wong,William L. Ledger
Obstetrics and Gynecology International , 2013, DOI: 10.1155/2013/473289
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