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Search Results: 1 - 10 of 18717 matches for " Kiu Han Teck "
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Steady State Simulation of 33 kV Power Grid  [PDF]
Kiu Han Teck, Nader Barsoum
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.66007
Abstract: An example is presented in this paper relating to power problems in Sandakan power network. Sandakan is a suburb in east coast of Sabah state of Malaysia. The problems were reported with power flow and N-1 contingency in terms of blackout after main grid supply outages with overload and high fault current on distribution system. This paper focuses on analysis of steady state stability of 33 kV power grid using load flow, contingency analysis and voltage stability (P-V Curve). The analysis is done by using industrial grade power software called Power System Simulation for Engineers (PSS/E). The power flow result showed that there are three generators generating out of limits. Contingency results showed that three transformer branches and three distribution branches are affected. There are nine weakest buses that violate contingency voltage deviation criterion and cannot withstand more load power when N-1-1 case in the branch of bus 8 to bus 28 is under outage.
Microfluidic Devices for Blood Fractionation
Han Wei Hou,Ali Asgar S. Bhagat,Wong Cheng Lee,Sha Huang,Jongyoon Han,Chwee Teck Lim
Micromachines , 2011, DOI: 10.3390/mi2030319
Abstract: Blood, a complex biological fluid, comprises 45% cellular components suspended in protein rich plasma. These different hematologic components perform distinct functions in vivo and thus the ability to efficiently fractionate blood into its individual components has innumerable applications in both clinical diagnosis and biological research. Yet, processing blood is not trivial. In the past decade, a flurry of new microfluidic based technologies has emerged to address this compelling problem. Microfluidics is an attractive solution for this application leveraging its numerous advantages to process clinical blood samples. This paper reviews the various microfluidic approaches realized to successfully fractionate one or more blood components. Techniques to separate plasma from hematologic cellular components as well as isolating blood cells of interest including certain rare cells are discussed. Comparisons based on common separation metrics including efficiency (sensitivity), purity (selectivity), and throughput will be presented. Finally, we will provide insights into the challenges associated with blood-based separation systems towards realizing true point-of-care (POC) devices and provide future perspectives.
Unified Theory of Everything and QQD  [PDF]
Paul Kiu S. Suh
Open Access Library Journal (OALib Journal) , 2015, DOI: 10.4236/oalib.1102000
Abstract: The fully Unified Theory of {Strong, EM, Weak, Gravity} interactions all arising from the unique source of electronic charges has been established. The theory proves that the Nature is astutely simple in essence, and the most of the recently promoted circuitous physics seem to be incorrect in the new light. In the proposed theory, the 100% of matter and energy content of the Universe, including the dark matter and energy, is predicted in terms of a single integer parameter L in one-to-one agreement with the observation. To boot, the {Z, W} bosons are proven to be compound states with their innate heavy masses; they never have been zero-mass particles, and the Higgs boson is uncalled for. The unified theory also has explicated the ever mysterious strong interaction number “137”, and leads to QQD (Quantum Quark Dynamics) parallel to the QED. The QQD gives, for example, very simple explanation of “Asymptotic Freedom” without requiring the unwarranted and arduously complex QCD.
Incidence coloring of Regular graphs and Complement graphs
Pak Kiu Sun
Mathematics , 2012,
Abstract: Using a relation between domination number and incidence chromatic number, we obtain necessary and sufficient conditions for $r$-regular graphs to be $(r+1)$-incidence colorable. Also, we determine the optimal Nordhaus-Gaddum inequality for the incidence chromatic number.
A 3D Electroactive Polypyrrole-Collagen Fibrous Scaffold for Tissue Engineering
Soh-Zeom Yow,Tze Han Lim,Evelyn K. F. Yim,Chwee Teck Lim,Kam W. Leong
Polymers , 2011, DOI: 10.3390/polym3010527
Abstract: Fibers that can provide topographical, biochemical and electrical cues would be attractive for directing the differentiation of stem cells into electro-responsive cells such as neuronal or muscular cells. Here we report on the fabrication of polypyrrole-incorporated collagen-based fibers via interfacial polyelectrolyte complexation (IPC). The mean ultimate tensile strength of the fibers is 304.0 ± 61.0 MPa and the Young’s Modulus is 10.4 ± 4.3 GPa. Human bone marrow-derived mesenchymal stem cells (hMSCs) are cultured on the fibers in a proliferating medium and stimulated with an external electrical pulse generator for 5 and 10 days. The effects of polypyrrole in the fiber system can be observed, with hMSCs adopting a neuronal-like morphology at day 10, and through the upregulation of neural markers, such as noggin, MAP2, neurofilament, β tubulin III and nestin. This study demonstrates the potential of this fiber system as an attractive 3D scaffold for tissue engineering, where collagen is present on the fiber surface for cellular adhesion, and polypyrrole is encapsulated within the fiber for enhanced electrical communication in cell-substrate and cell-cell interactions.
Ternary Sums of Squares and Triangular Numbers
Wai Kiu Chan,Anna Haensch
Mathematics , 2010,
Abstract: For any integer $x$, let $T_x$ denote the triangular number $\frac{x(x+1)}{2}$. In this paper we give a complete characterization of all the triples of positive integers $(\alpha, \beta, \gamma)$ for which the ternary sums $\alpha x^2 +\beta T_y + \gamma T_z$ represent all but finitely many positive integers. This resolves a conjecture of Kane and Sun \cite[Conjecture 1.19(i)]{KS08} and complete the characterization of all almost universal ternary mixed sums of squares and triangular numbers.
Small zeros of hermitian forms over a quaternion algebra
Wai Kiu Chan,Lenny Fukshansky
Mathematics , 2009,
Abstract: Let $D$ be a positive definite quaternion algebra over a totally real number field $K$, $F(X,Y)$ a hermitian form in 2N variables over $D$, and $Z$ a right $D$-vector space which is isotropic with respect to $F$. We prove the existence of a small-height basis for $Z$ over $D$, such that $F(X,X)$ vanishes at each of the basis vectors. This constitutes a non-commutative analogue of a theorem of Vaaler, and presents an extension of the classical theorem of Cassels on small zeros of rational quadratic forms to the context of quaternion algebras.
The representation of integers by positive ternary quadratic polynomials
Wai Kiu Chan,James Ricci
Mathematics , 2015,
Abstract: An integral quadratic polynomial is called regular if it represents every integer that is represented by the polynomial itself over the reals and over the $p$-adic integers for every prime $p$. It is called complete if it is of the form $Q({\mathbf x} + {\mathbf v})$, where $Q$ is an integral quadratic form in the variables ${\mathbf x} = (x_1, \ldots, x_n)$ and ${\mathbf v}$ is a vector in ${\mathbb Q}^n$. Its conductor is defined to be the smallest positive integer $c$ such that $c{\mathbf v} \in {\mathbb Z}^n$. We prove that for a fixed positive integer $c$, there are only finitely many equivalence classes of positive primitive ternary regular complete quadratic polynomials with conductor $c$. This generalizes the analogous finiteness results for positive definite regular ternary quadratic forms by Watson and for ternary triangular forms by Chan and Oh.
On moduli of k-convexity
Teck-Cheong Lim
Abstract and Applied Analysis , 1999, DOI: 10.1155/s1085337599000202
Abstract:
The good, the bad and the ugly: The shifting ethical stance of Malaysian consumers The good, the bad and the ugly: The shifting ethical stance of Malaysian consumers The good, the bad and the ugly: The shifting ethical stance of Malaysian consumers
Teck-Chai Lau
Intangible Capital , 2010, DOI: 10.3926/ic.174
Abstract: Due to the recent business ethical problems in Malaysia such as tax fraud, deceptive advertising, production of unsafe products and copyright piracy, the current research aim to examine ethical issues in the marketplace from the perspective of consumers. There are three objectives of this research. The first objective is to investigate the effect of moral ideologies and Machiavellianism on consumer ethical beliefs. The second objective is to determine which of these ideologies exert the greatest influence on consumer ethical beliefs and the third objective is to discover whether Malaysian consumers have evolved in their ethical stance over the last ten years. The dependent variable in this research is the recently modified consumer ethics scale developed by Vitell and Muncy (2005). An online survey was adopted as data collection method as it was inexpensive, fast and could ensure high response rates. However it has several limitations such as the possible non-representativeness of Internet respondents to the Malaysian population and higher non-response error. The results indicated that idealism exerted the greatest influence on all the four dimensions of consumer ethics. It was also revealed that Malaysian consumers had evolved over the past ten years in their moral ideology: from relativism to idealism. Due to the recent business ethical problems in Malaysia such as tax fraud, deceptive advertising, production of unsafe products and copyright piracy, the current research aim to examine ethical issues in the marketplace from the perspective of consumers. There are three objectives of this research. The first objective is to investigate the effect of moral ideologies and Machiavellianism on consumer ethical beliefs. The second objective is to determine which of these ideologies exert the greatest influence on consumer ethical beliefs and the third objective is to discover whether Malaysian consumers have evolved in their ethical stance over the last ten years. The dependent variable in this research is the recently modified consumer ethics scale developed by Vitell and Muncy (2005). An online survey was adopted as data collection method as it was inexpensive, fast and could ensure high response rates. However it has several limitations such as the possible non-representativeness of Internet respondents to the Malaysian population and higher non-response error. The results indicated that idealism exerted the greatest influence on all the four dimensions of consumer ethics. It was also revealed that Malaysian consumers had evolved over the past ten years in
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