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Search Results: 1 - 10 of 36464 matches for " Wee-Hong Koh "
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A Clinical Diagnostic Model for Predicting Influenza among Young Adult Military Personnel with Febrile Respiratory Illness in Singapore
Vernon J. Lee,Jonathan Yap,Alex R. Cook,Chi Hsien Tan,Jin-Phang Loh,Wee-Hong Koh,Elizabeth A. S. Lim,Jasper C. W. Liaw,Janet S. W. Chew,Iqbal Hossain,Ka Wei Chan,Pei-Jun Ting,Sock-Hoon Ng,Qiuhan Gao,Paul M. Kelly,Mark I. Chen,Paul A. Tambyah,Boon Huan Tan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0017468
Abstract: Influenza infections present with wide-ranging clinical features. We aim to compare the differences in presentation between influenza and non-influenza cases among those with febrile respiratory illness (FRI) to determine predictors of influenza infection.
Efficiencies of Aloof-Scattered Electron Beam Excitation of Metal and Graphene Plasmons
Kelvin J. A. Ooi,Wee Shing Koh,Hong Son Chu,Dawn T. H. Tan,L. K. Ang
Physics , 2015, DOI: 10.1109/TPS.2014.2379259
Abstract: We assessed the efficiencies of surface plasmon excitation by an aloof-scattered electron beam on metals and graphene. Graphene is shown to exhibit high energy transfer efficiencies at very low electron kinetic energy requirements. We show that the exceptional performance of graphene is due to its unique plasmon dispersion, low electronic density and thin-film structure. The potential applications of these aloof-scattered graphene plasmons are discussed in aspects of coherent radiation.
Automated systems to identify relevant documents in product risk management
Xue Wee, Yvonne Koh, Chun Yap
BMC Medical Informatics and Decision Making , 2012, DOI: 10.1186/1472-6947-12-13
Abstract: The general automated system had an area under the curve value of 0.731 and was able to rank 34.6% and 46.2% of the total number of 'useful' articles among the first 10% and 20% of the articles presented to the evaluators when tested on the generalizability set. However, its use may be limited by the subjective definition of useful articles. For the specific automated system, it was found that only 20 articles were required to develop a specific automated system with a prediction performance (AUC 0.748) that was better than that of general automated system.Specific automated systems can be developed rapidly and avoid problems caused by subjective definition of useful articles. Thus the efficiency of product risk management can be improved with the use of specific automated systems.Product risk management involves critical assessment of health product safety issues by evaluating their risk-benefit ratio, on occasion followed by taking appropriate regulatory actions to mitigate these safety concerns [1]. Environmental scanning of safety information of health products is usually conducted through several sources to ensure thorough search and extensive coverage. Firstly, local trends of adverse events incidence can be obtained from spontaneous adverse events reporting. These adverse events are observed during clinical practice and reported to the regulatory agency by healthcare professionals or by pharmaceutical manufacturers. Information on product safety may also be obtained from safety alerts disseminated by different regulatory authorities such as the Therapeutic Goods Administration in Australia, the Food and Drug Administration in the United States of America and the European Medicines Agency in Europe. Regulatory authorities all over the world work closely together and alert each other of any safety concerns raised. Another source of safety information will be the primary literature where results of clinical trials, case reports and other safety-related studies m
The effect of cotton-based collection methods on eosinophil cationic protein (ECP) concentrations detected in saliva
Teck Yee Wong,David Koh,Andrew Wee,Vivian Ng
Journal of Asthma and Allergy , 2008,
Abstract: Teck Yee Wong, David Koh, Andrew Wee, Vivian Ng, Yong Tat Koh, Zhenjie Sum, Gerald KohDepartment of Community, Occupational and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore, SingaporeBackground: Salivary eosinophil cationic protein (ECP) level has the potential to be an assessment tool for asthma. Its measurement is not well-established and needs standardization. We studied how passive drool (PD) and two commercial devices, Salivette (cotton-based device) and Sorbette (cellulose–cotton-based-device), may affect ECP levels during collection among healthy subjects.Methods: Study I (n = 10) involved direct sampling of healthy adult subjects with Salivette and Sorbette . Study II (n = 33) involved ‘indirect’ sampling of previously collected PD by both devices.Results: In study I, ECP levels were detected in all PD samples but only in three with Sorbette and none with Salivette (collection order: PD, Sorbette and Salivette ). We changed the order of collection (Salivette , Sorbette , PD) and the results were similar (ECP levels detected in all PD samples, three with Sorbette and only one with Salivette ). In study II, ECP levels in saliva collected by PD was 12.8 μg/L (median) and using Sorbette and Salivette were < 2.0 μg/L and 3.4 μg/L respectively (p < 0.01). ECP levels in PD correlated with Sorbette (rs = 0.79, p < 0.01) and Salivette (rs = 0.62, p 0.01).Conclusion: Compared to PD, saliva collected using cotton or cellulose-based collection devices resulted in lower measurable ECP levels.Keywords: salivary ECP, collection methods
Surface Roughness and Tool Wear Study on Milling of AISI 304 Stainless Steel Using Different Cooling Conditions
P. Chockalingam,Lee Hong Wee
International Journal of Engineering and Technology , 2012,
Abstract: This research deals with the effect of different coolant conditions on milling of AISI 304 stainless steel. Cooling methods used in this investigation were flooding of synthetic oil, water-based emulsion, and compressed cold air. Cutting forces and the surface roughness were studied and tool flank wears observed. In this study, the comparison between different coolants’ effect to the milling of AISI 304 stainless steel is done and the results from the study can provide very useful information in manufacturing field. The experiment results showed that water-based emulsion gave better surface finish and lower cutting force followed by synthetic oil and compressed cold air. Different cooling condition required different parameters in order to obtain lower surface roughness and cutting force. Chipping was the initial wear mode in the milling of AISI 304 stainless steel.
Assessing the Efficacy of Two Indirect Methods for Quantifying Canopy Variables Associated with the Interception Loss of Rainfall in Temperate Hardwood Forests  [PDF]
Thomas G. Pypker, Catherine S. Tarasoff, Hong-Suk Koh
Open Journal of Modern Hydrology (OJMH) , 2012, DOI: 10.4236/ojmh.2012.22005
Abstract: Forest canopy water storage (S), direct throughfall fraction (p) and mean evaporation rate to mean rainfall intensity ratio (E/R) vary between storms and seasonally. Typically, researchers only quantify the mean growing and dormant season values of S, p and E/R for deciduous forests, thereby ignoring seasonal changes S, p and E/R .Past researchers adapted the mean method, which is usually used to estimate S, p and E/R on an annual or seasonal basis, to estimate the same canopy variables on a per storm basis (individual storm (IS) method). The disadvantage of the IS method is that it requires more expensive equipment and the calculation of the canopy variables is more labor intensive relative to the mean method. The goal of this study was to explore the use of the IS method for northern hardwood forests and to determine whether estimates of S, p and E/R derived by the IS method produce more accurate estimates of rainfall interception loss (In) using the Gash model relative to estimates derived by the mean method. The IS method estimated that S increased from approximately 0.11 mm in the early spring to 1.2 mm in the summer and then declined to 0.24 mm after fall senescence. Direct throughfall decreased from 0.4 in the early spring to 0.11 in the summer, and then increased to 0.4 after leaf senescence. When measurement period estimates of p, S and E/R derived by the IS and mean methods were applied to the Gash model, the modeled estimates of In differed from the measured values by 14.0 mm and 1.3 mm, respectively. Therefore, because the mean method provided more accurate estimates of In, the extra effort and expense required by the IS method is not advantageous for studies in northern hardwood forests that only need to model annual or seasonal estimates of In.
The effect of cotton-based collection methods on eosinophil cationic protein (ECP) concentrations detected in saliva
Teck Yee Wong, David Koh, Andrew Wee, Vivian Ng, Yong Tat Koh, et al
Journal of Asthma and Allergy , 2008, DOI: http://dx.doi.org/10.2147/JAA.S3563
Abstract: t of cotton-based collection methods on eosinophil cationic protein (ECP) concentrations detected in saliva Original Research (4944) Total Article Views Authors: Teck Yee Wong, David Koh, Andrew Wee, Vivian Ng, Yong Tat Koh, et al Published Date November 2008 Volume 2008:1 Pages 45 - 48 DOI: http://dx.doi.org/10.2147/JAA.S3563 Teck Yee Wong, David Koh, Andrew Wee, Vivian Ng, Yong Tat Koh, Zhenjie Sum, Gerald Koh Department of Community, Occupational and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore Background: Salivary eosinophil cationic protein (ECP) level has the potential to be an assessment tool for asthma. Its measurement is not well-established and needs standardization. We studied how passive drool (PD) and two commercial devices, Salivette (cotton-based device) and Sorbette (cellulose–cotton-based-device), may affect ECP levels during collection among healthy subjects. Methods: Study I (n = 10) involved direct sampling of healthy adult subjects with Salivette and Sorbette . Study II (n = 33) involved ‘indirect’ sampling of previously collected PD by both devices. Results: In study I, ECP levels were detected in all PD samples but only in three with Sorbette and none with Salivette (collection order: PD, Sorbette and Salivette ). We changed the order of collection (Salivette , Sorbette , PD) and the results were similar (ECP levels detected in all PD samples, three with Sorbette and only one with Salivette ). In study II, ECP levels in saliva collected by PD was 12.8 μg/L (median) and using Sorbette and Salivette were < 2.0 μg/L and 3.4 μg/L respectively (p < 0.01). ECP levels in PD correlated with Sorbette (rs = 0.79, p < 0.01) and Salivette (rs = 0.62, p 0.01). Conclusion: Compared to PD, saliva collected using cotton or cellulose-based collection devices resulted in lower measurable ECP levels.
Current Distributions Along a Receiving Thin Dipole Inside Ideal Anechoic and Reverberation Chambers
Weiye Zhong;Zhongxiang Shen;Yeow Kwang Roland Tai;Wee Jin Koh
PIER , 2008, DOI: 10.2528/PIER08102801
Abstract: This paper studies the correlation of a receiving thin dipole with an arbitrary load in both anechoic chamber (AC) and reverberation chamber (RC). In both cases, the method of moments is employed to calculate the current distributions along a thin dipole induced by external fields. In AC, a plane wave with a fixed incident angle and polarization is illuminated on the dipole; whereas in RC, the field is represented by an appropriate superposition of many incident plane waves with stochastic incident angles, polarizations and phases. Numerical results for the current distributions of a thin dipole with different loads and electrical lengths are presented and discussed in both chambers. It is demonstrated that the ratios with respect to current magnitudes at the arbitrary load of the thin dipole between AC and RC are determined by its directivity. In particular, the ratios with respect to current magnitudes along the entire dipole whose electrical length is less than half a wavelength are nearly constants regardless of the terminating load, which indicates that results obtained in both chambers are well correlated.
Coupling Cross Section and Shielding Effectiveness Measurements on a Coaxial Cable by Both Mode-Tuned Reverberation Chamber and Gtem Cell Methodologies
Ya Jun Wang;Wee Jin Koh;C.K K. Lee
PIER , 2004, DOI: 10.2528/PIER03100101
Abstract: The field-to-cable coupling cross section is proposed to evaluate the coupling performance of a single-braided coaxial cable. In addition, a new definition for the coax shielding effectiveness is suggested. Both the coupling cross section and the shielding effectiveness of a 1.25 m-length RG 58 C/U 50 coax are measured byemplo ying both the mode-tuned reverberation chamber and GTEM cell methodologies. The detailed measurement set-ups and results are presented. The mode-tuned reverberation chamber methodologyis proven to be beneficial for assessing the cable shielding and coupling characteristics over a wide frequencyrange.
The Capacitive Behaviors of Manganese Dioxide Thin-Film Electrochemical Capacitor Prototypes
Suh Cem Pang,Boon Hong Wee,Suk Fun Chin
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/397685
Abstract: We have documented the fabrication of manganese dioxide (MnO2) thin-film electrochemical capacitor (EC) prototypes with dual-planar electrode configuration. These EC prototypes exhibited good capacitive behaviors in mild Na2SO4 aqueous electrolyte. Enhanced capacitive behaviors of EC prototypes were observed upon prolonged voltammetric cycling which could be associated with microstructural transformation of MnO2 thin-film electrodes from densely packed plate-like to irregular petal-like surface morphology. Effects of voltammetric scan rates, prolonged voltammetric cycling, electrolyte composition, and electrolyte concentration on the surface morphology of MnO2 thin-film electrodes, and associated capacitive behaviors of MnO2 thin-film EC prototypes were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) techniques. Results of both CV and EIS indicated that thin-film MnO2 EC prototypes exhibited the highest specific capacitance of 327?F/g in 0.2?M Na2SO4 aqueous electrolyte. Being environmentally benign and cheap, MnO2 thin-film electrochemical capacitors have high potential utility as pulsed power sources, as well as load-leveling functions in various consumer electronic devices. 1. Introduction The phenomenal increase in demands for electronic devices, power tools, and energy-intensive device applications necessitate the continual development of new generation energy-storage systems of high rate capability and performances. Energy-storage devices particularly pseudocapacitive electrochemical capacitors (ECs) fabricated using various nanoparticulate transition metal oxides have gained increasing interest among research scientists worldwide due to their high energy and power densities. Among them, manganese dioxide- (MnO2-) based electrodes have been reported to exhibit high specific capacitance which ranged from 130 to 700?F/g in mild aqueous electrolytes [1–3]. However, these capacitance values are still substantially lower than the theoretical value of 1,380?F/g which corresponds to the complete reduction of Mn4+ to Mn3+. Low utilization of bulk MnO2 electroactive material for electrical energy storage could be mainly attributed to microstructural factors associated with the electroactive material concerned. As such, microstructural control at the nanoscale has been one of the major focuses in the development of novel electroactive materials that exhibit both high energy and power densities. Electroactive materials of desired pore size distribution, microstructure,
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