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Your search keyword '"Tang, V. H."' showing total 14 results
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14 results on '"Tang, V. H."'

9. Enhanced through-the-wall radar imaging using bayesian compressive sensing

Author

Tang, V H, Bouzerdoum, A, Phung, S L, Tivive, F H. C, Tang, V H, Bouzerdoum, A, Phung, S L, and Tivive, F H. C

Abstract

In this paper, a distributed compressive sensing (CS) model is proposed to recover missing data samples along the temporal frequency domain for through-the-wall radar imaging (TWRI). Existing CS-based approaches recover the signal from each antenna independently, without considering the correlations among measurements. The proposed approach, on the other hand, exploits the structure or correlation in the signals received across the array aperture by using a hierarchical Bayesian model to learn a shared prior for the joint reconstruction of the high-resolution radar profiles. A backprojection method is then applied to form the radar image. Experimental results on real TWRI data show that the proposed approach produces better radar images using fewer measurements compared to existing CS-based TWRI methods. (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Published
2013

13. Validation of the International Myositis Assessment and Clinical Studies Group guideline on cancer risk stratification.

Author

Tang IYK, Chan SCW, Li PH, Li TWL, Luk LTH, Chan D, Ho R, Lai BTL, Lee ML, Tang VHS, and So H

Abstract

Objectives: Adult-onset Idiopathic inflammatory myopathies (IIMs) are associated with cancer. Guideline on cancer risk stratifications and screening in IIM patients was recently published, but their external validity remains verified. We evaluated its applicability and reliability among a Hong Kong IIM cohort., Methods: The longitudinal observational cohort collected data from IIM patients fulfilling relevant classification criteria from 8 rheumatology centres in Hong Kong. Demographic, clinical and laboratory data were reviewed from 2004-2023. IIM patients were stratified into standard, intermediate or high-risk subgroups according to the IMACS guideline. The occurrence of malignancy at or after IIM diagnosis was analyzed. Independent risk factors for cancer were evaluated., Results: 479 patients were included with 327 females (68.3%) and mean age of IIM diagnosis at 54.5 ± 13.6 years. 214 (44.7%) and 238 (49.7%) patients were stratified to high and intermediate risk groups, respectively. Only 5.6% belonged to the standard-risk group. 60 patients (12.5%) had cancer within 3 years of IIM diagnosis. Nasopharyngeal (25%), lung (21.1%) and breast (10.5%) were the top 3 cancers. Significantly more patients (44, 20.6%) in the high-risk group developed cancer within 3 years, compared with intermediate (6.7%, p< 0.001) and standard-risk (0%, p= 0.009) groups. Risk factors for cancer included older age (OR : 1.048, 95%CI : 1.019-1.078), Gottron's rash (OR : 2.453, 95%CI : 1.123-5.356), absence of ILD (OR 2.695, 95% CI : 1.154-6.295), anti-TIF1g positivity (OR : 4.627, 95% CI : 2.046-10.461) and anti-SAE1 positivity (OR : 5.325, 95% CI : 1.271-22.300)., Conclusions: Our real-world study supported the accuracy of cancer risk stratification. Vast majority of IIM patients would be subjected to extensive cancer screening when the guideline was applied., (© The Author(s) 2024. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For permissions, please email: journals.permissions@oup.com.)

Published
2024
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14. Expression and localisation of thioredoxin in mouse reproductive tissues during the oestrous cycle.

Author

Osborne LJ, Tonissen KF, Tang VH, and Clarke FM

Subjects
Animals, Blotting, Western, Cervix Uteri metabolism, Cervix Uteri ultrastructure, Epithelial Cells chemistry, Fallopian Tubes metabolism, Fallopian Tubes ultrastructure, Female, Gene Expression Regulation, Genitalia, Female ultrastructure, Immunoenzyme Techniques, Mice, Organ Specificity, Ovary metabolism, Ovary ultrastructure, Oxidation-Reduction, Oxidative Stress, Thioredoxins analysis, Thioredoxins genetics, Uterus metabolism, Uterus ultrastructure, Vagina metabolism, Vagina ultrastructure, Estrus metabolism, Genitalia, Female metabolism, Thioredoxins biosynthesis
Abstract

Thioredoxin expression within the reproductive tissues of the female mouse was analysed during the oestrous cycle stages of dioestrus, oestrus and metoestrus by Western blot analyses and immunocytochemistry. From Western blot analyses the expression of thioredoxin was found to be increased in oestrus compared to dioestrus and metoestrus. Localisation of thioredoxin within the reproductive organs of the mouse during the oestrous cycle has shown that the expression of thioredoxin is specific for distinct areas within the reproductive organs. These areas are the stratified squamous epithelium of the vagina, the simple columnar epithelium and the uterine glands of the uterus, the ciliated columnar epithelium of the oviduct, the corpus lutea, the interstitial cells and the secondary follicles of the ovary. The discrete cellular localisation and oestrous dependence of thioredoxin expression are suggestive of specific roles in various reproductive processes.

Published
2001
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