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Indium oxide, tin oxide and indium tin oxide nanostructure growth by vapor deposition
M.K. Fung,K.K. Wong,X.Y. Chen,Y.F. Chan,A.M.C. Ng,A.B. Djurišić,W.K. Chan 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Indium oxide, tin oxide and indium tin oxide nanowires have been grown by vapor deposition on Si and quartz substrates. Under the growth conditions used, pure SiOx nanowires, a mixture of SiOx and indium oxide, tin oxide or indium tin oxide nanostructures, or pure indium oxide, tin oxide or indium tin oxide nanostructures could be obtained at different substrate temperatures. The growth mechanism of the obtained nanostructures at different substrate temperatures is discussed. Optical and electrical properties of the deposited pure indium oxide, tin oxide or indium tin oxide nanostructures have been measured, and low sheet resistances on quartz substrates have been obtained for indium oxide and indium tin oxide nanostructures.
Performance Evaluation of the RTK-GNSS Navigating under Different Landscape
K.M. Ng,J. Johari,S.A.C. Abdullah,A. Ahmad,B. N. Laja 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
The navigation of autonomous vehicles depends on various sensors. One of the technologies that assist in the vehicles position localization and navigation is the Global Positioning System (GPS). Enhancement of the GPS technology reveals the application of Real Time Kinematics (RTK)-GPS to achieve higher accuracy based on corrections sent from a base station to the receiver. However, there is limited evaluation of the performance of the RTK-GPS when the vehicle is travelling in land area that is obstructed by buildings and also in uneven landscape. Hence, the purpose of this work is to conduct an experimental and comparative study to evaluate the performance of the RTK-GPS in flat-unobstructed, uneven-unobstructed and uneven-obstructed situations respectively. Three locations that possess the respective landscape characteristics in the state of Selangor, Malaysia were chosen to conduct the experiments. Results of logged RTK coordinates were compared with coordinates of the actual path travelled by the vehicle using statistical methods. In addition, the quality indicators of the coordinates logged were also evaluated. The results show that navigation on flat-unobstructed and uneven-unobstructed landscape has similar performances with floating coordinates range of errors.
Indium tin oxide nanorods by dc sputtering
M.K. Fung,Y.C. Sun,A.M.C. Ng,A.B. Djurišić,W.K. Chan 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Growth of indium tin oxide (ITO) nanorods by sputtering without any use of templates or oblique angle deposition has been achieved. The morphology, optical and electrical properties of ITO nanorods obtained under different deposition conditions have been characterized. The deposition conditions resulting in high transmission and low sheet resistance have been determined. Dense ITO nanorod array has potential for application as a contact in light-emitting diodes
Variable Bi-Level Phase-Shifted Driving Method for High-Power RGB LED Lamps
S. K. Ng,K. H. Loo,Y. M. Lai,K. T. Mok,Chi K. Tse 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Based on the recently proposed bi-level driving method, this paper presents an extended version of the existing method, which is aimed at maximizing the luminous output of high-power LED lamps by piecewise-linear tracing of their luminous output curves under AM (amplitude modulation) driving. The proposed driving method divides the luminous output curve of an AM-driven LED into a multiple sections, where each section is approximated by a straight line with two predefined end-points acting as the lower and upper current levels as used in the existing bi-level driving method. The intermediate current and luminosity values lying between the upper and lower current levels are obtained by duty cycle mixing of the two current levels. The joined multiple sections has enabled a near-maximum luminous output to be extracted from the LED while a linear dimming is realized within each section. The proposed driving method is verified by implementation in a single-driver RGB color LED lighting system with the red, green, and blue LED driven in a time-sequential manner (or shifted in phase). Experimental results show that a significant gain in luminous efficacy, hence energy saving, is achieved compared to the commonly used pulse-width modulation (PWM) driving.
Mammalian Systems Biotechnology Reveals Global Cellular Adaptations in a Recombinant CHO Cell Line
Yusufi, F.N.K.,Lakshmanan, M.,Ho, Y.S.,Loo, B.L.W.,Ariyaratne, P.,Yang, Y.,Ng, S.K.,Tan, T.R.M.,Yeo, H.C.,Lim, H.L.,Ng, S.W.,Hiu, A.P.,Chow, C.P.,Wan, C.,Chen, S.,Teo, G.,Song, G.,Chin, J.X.,Ruan, X. Cell Press 2017 Cell systems Vol.4 No.5
Effective development of host cells for therapeutic protein production is hampered by the poor characterization of cellular transfection. Here, we employed a multi-omics-based systems biotechnology approach to elucidate the genotypic and phenotypic differences between a wild-type and recombinant antibody-producing Chinese hamster ovary (CHO) cell line. At the genomic level, we observed extensive rearrangements in specific targeted loci linked to transgene integration sites. Transcriptional re-wiring of DNA damage repair and cellular metabolism in the antibody producer, via changes in gene copy numbers, was also detected. Subsequent integration of transcriptomic data with a genome-scale metabolic model showed a substantial increase in energy metabolism in the antibody producer. Metabolomics, lipidomics, and glycomics analyses revealed an elevation in long-chain lipid species, potentially associated with protein transport and secretion requirements, and a surprising stability of N-glycosylation profiles between both cell lines. Overall, the proposed knowledge-based systems biotechnology framework can further accelerate mammalian cell-line engineering in a targeted manner.
Incremental Model-based Test Suite Reduction with Formal Concept Analysis
Ng, Pin,Fung, Richard Y.K.,Kong, Ray W.M. Korea Information Processing Society 2010 Journal of information processing systems Vol.6 No.2
Test scenarios can be derived based on some system models for requirements validation purposes. Model-based test suite reduction aims to provide a smaller set of test scenarios which can preserve the original test coverage with respect to some testing criteria. We are proposing to apply Formal Concept Analysis (FCA) in analyzing the association between a set of test scenarios and a set of transitions specified in a state machine model. By utilizing the properties of concept lattice, we are able to determine incrementally a minimal set of test scenarios with adequate test coverage.
Synthesis of GaN nanowires on gold-coated substrates by pulsed laser ablation
D.K.T. Ng,L.S. Tan,M.H. Hong 한국물리학회 2006 Current Applied Physics Vol.6 No.3
GaN nanowires were grown on gold-coated sapphire substrates by pulsed laser ablation of a target of GaN powder in low-pressurenitrogen gas. The laser ablation induced Ga and N plasma directly towards the substrate to initialize the vaporliquidsolid (VLS)growth mechanism. The morphological and structural properties of the GaN nanowires were studied using scanning electron microscopy(SEM), transmission electron microscopy (TEM) and X-ray diraction (XRD). The nanowires formed crystalline and have lengths fromthe VLS growth mechanism. In addition, the electrical properties of these nanowires were also examined.
Silva, M.,Daheron, L.,Hurley, H.,Bure, K.,Barker, R.,Carr, Andrew J.,Williams, D.,Kim, H.W.,French, A.,Coffey, Pete J.,Cooper-White, Justin J.,Reeve, B.,Rao, M.,Snyder, Evan Y.,Ng, Kelvin S.,Mead, Ben Cell Press 2015 Cell stem cell Vol.16 No.1
Induced pluripotent stem cells (iPSCs) have the potential to transform drug discovery and healthcare in the 21<SUP>st</SUP> century. However, successful commercialization will require standardized manufacturing platforms. Here we highlight the need to define standardized practices for iPSC generation and processing and discuss current challenges to the robust manufacture of iPSC products.