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807 results on '"Chan, S Y"'

1. Finding Maximum Cliques in Large Networks

Author

Chan, S. Y., Morgan, K., and Ugon, J.

Subjects
Computer Science - Social and Information Networks, Mathematics - Combinatorics
Abstract

There are many methods to find a maximum (or maximal) clique in large networks. Due to the nature of combinatorics, computation becomes exponentially expensive as the number of vertices in a graph increases. Thus, there is a need for efficient algorithms to find a maximum clique. In this paper, we present a graph reduction method that significantly reduces the order of a graph, and so enables the identification of a maximum clique in graphs of large order, that would otherwise be computational infeasible to find the maximum. We find bounds of the maximum (or maximal) clique using this reduction. We demonstrate our method on real-life social networks and also on Erd\"{o}s-Renyi random graphs.

Published
2022

2. Exact Counts of $C_{4}$s in Blow-Up Graphs

Author

Chan, S. Y., Morgan, K., and Ugon, J.

Subjects
Mathematics - Combinatorics
Abstract

Cycles have many interesting properties and are widely studied in many disciplines. In some areas, maximising the counts of $k$-cycles are of particular interest. A natural candidate for the construction method used to maximise the number of subgraphs $H$ in a graph $G$, is the \emph{blow-up} method. Take a graph $G$ on $n$ vertices and a pattern graph $H$ on $k$ vertices, such that $n\geq k$, the blow-up method involves an iterative process of replacing vertices in $G$ with a copy of the $k$-vertex graph $H$. In this paper, we apply the blow-up method on the family of cycles. We then present the exact counts of cycles of length 4 for using this blow-up method on cycles and generalised theta graphs., Comment: arXiv admin note: substantial text overlap with arXiv:2202.00411

Published
2022

4. Comparison of body composition assessment tools in infancy

Author

Lyons-Reid, J., primary, Derraik, J.G.B., additional, Albert, B.B., additional, Kenealy, T., additional, Cutfield, W.S., additional, Ward, L.C., additional, Tint, M-T., additional, Chan, S-Y., additional, Monnard, C.R., additional, Ramos Nieves, J.M., additional, and Godfrey, K.M., additional

Published
2024
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12. Evolution of Papillomaviruses

Author

Bernard, H.-U., Chan, S.-Y., Delius, H., Capron, A., editor, Compans, R. W., editor, Cooper, M., editor, Koprowski, H., editor, McConnell, I., editor, Melchers, F., editor, Oldstone, M., editor, Olsnes, S., editor, Potter, M., editor, Saedler, H., editor, Vogt, P. K., editor, Wagner, H., editor, Wilson, I., editor, and zur Hausen, Harald, editor

Published
1994
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24. The placental lipidome of maternal antenatal depression predicts socio-emotional problems in the offspring

Author

Wong, G, Weir, JM, Mishra, P, Huynh, K, Nijagal, B, Gupta, V, Broekman, BFP, Chong, MF-F, Chan, S-Y, Tan, KH, Tull, D, McConville, M, Calder, PC, Godfrey, KM, Chong, YS, Gluckman, PD, Meaney, MJ, Meikle, PJ, Karnani, N, Wong, G, Weir, JM, Mishra, P, Huynh, K, Nijagal, B, Gupta, V, Broekman, BFP, Chong, MF-F, Chan, S-Y, Tan, KH, Tull, D, McConville, M, Calder, PC, Godfrey, KM, Chong, YS, Gluckman, PD, Meaney, MJ, Meikle, PJ, and Karnani, N

Abstract

While maternal mental health strongly influences neurodevelopment and health in the offspring, little is known about the determinants of inter-individual variation in the mental health of mothers. Likewise, the in utero biological pathways by which variation in maternal mental health affects offspring development remain to be defined. Previous studies implicate lipids, consistent with a known influence on cognitive and emotional function, but the relevance for maternal mental health and offspring neurodevelopment is unclear. This study characterizes the placental and circulatory lipids in antenatal depression, as well as socio-emotional outcomes in the offspring. Targeted liquid chromatography-mass spectrometry covering 470 lipid species was performed on placenta from 186 women with low (n = 70) or high (n = 116) levels of antenatal depressive symptoms assessed using the Edinburgh Postnatal Depression Scale at 26 weeks' gestation. Child socio-emotional outcomes were assessed from the Child Behavior Check List (CBCL) at 48 months. Seventeen placental lipid species showed an inverse association with antenatal EPDS scores. Specifically, lower levels of phospholipids containing LC-PUFAs: omega-3 docosapentaenoic acid (DPA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and omega-6 arachidonic acid (AA) were significantly associated with depressive symptoms. Additional measurement of LC-PUFA in antenatal plasma samples at mid-gestation confirmed the reduced circulation of these specific fatty acids in mothers. Reduced concentration of the placental phospholipids also predicted poorer socio-emotional outcomes in the offspring. This study provides new insights into the role of the materno-fetal lipid cross-talk as a mechanism linking maternal mental health to that of the offspring. These findings show the potential utility of nutritional approaches among pregnant women with depressive symptoms to reduce offspring risk for later socio-emotional problems.

Published
2021

45. Shenzhen Western Corridor

Author

Kong, A, primary, Falbe-Hansen, K, additional, Chan, E, additional, Hussain, N, additional, Chan, S Y, additional, Wong, C, additional, Moneypenny, K, additional, and Leung, K Y, additional

Published
2003
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