University of the Thai Chamber of Commerce

About: University of the Thai Chamber of Commerce is a education organization based out in Bangkok, Thailand. It is known for research contribution in the topics: Corporate social responsibility & General equilibrium theory. The organization has 223 authors who have published 422 publications receiving 5380 citations.

Structural characterization and molecular dynamics simulations studies of family-10 xylanase from Bacillus firmus K-1 complex with xylopentaose: a novel feature of the xylanase catalytic mechanism

Abstract: Xylanases hydrolyze the β-1,4-linked xylose backbone of xylans, the majorhemicellulosic components of plant cell walls. They are especially useful in paper industrybecause they decrease the demand for chlorine-based chemicals in the wood pulpdelignification process. In this study, 3D structure of Xyn10A, a family 10 xylanase fromBacillus firmus K-1 was generated by homology modeling using X-ray structure of xylanasefrom Bacillus sp. strain NG-27 as a template. The root mean square deviation (RMSD) ofbackbone atoms between the X-ray and homology modeled structures was 0.8 A. Binding ofxylopentaose (X5) to the Xyn10A was investigated using molecular dynamics simulations viacomparison the total energy, RMSD of Cα atom and root mean square fluctuation (RMSF) offree and complex forms of Xyn10A. In the reactive Xyn10A-X5 conformation, in which thetwo catalytic sites, E149 and E255 are precisely positioned for the catalytic reaction, the -1sugar moiety of the X5 adopted a 1C4 chair conformation for the Xyn10A. According to theRMSF, 13 amino acid residues in active site of complex form showed more flexibility thanthose of free form. The result suggested that they may implicate in binding to X5 at subsites -3 to +2 of substrate-binding site through hydrogen bonding and stacking interactions.Furthermore, the RMSF of X5 revealed that the substrate binding site of Xyn10A was morespecific to three middle xylose moieties than two terminal xylose moieties. The role of sugarmoiety interaction with Xyn10A in catalytic mechanism is discussed. Keywords: Bacillus firmus, 3D structure, family 10 xylanase, homology modeling, moleculardynamics simulations

Regular graphs with maximum forest number

Abstract: Punnim proved in [6] that if G is an r-regular graph of order n, then its forest number is at most c, where $$c=\left\{ \begin{array} {ll} n-r+1 & {\rm if} \; r+1 \leq n \leq 2r-1,\\ \lfloor \frac{nr-2}{2(r-1)} \rfloor & {\rm if}\; n\geq 2r. \end{array} \right.$$ He also proved that the bound is sharp. Let ${\cal{R}}(r^{n};c)$ be the class of all r-regular graphs of order n. We prove in this paper that if $G, H\in{\cal{R}}(r^{n};c)$, then there exists a sequence of switchings σ1, σ2, …, σt such that for each i=1, 2, …, t, $G^{\sigma_1\sigma_2\cdots\sigma_i}\in{\cal{R}}(r^n;c)$ and $H=G^{\sigma_1\sigma_2\cdots\sigma_t}$.

Animation techniques for 3d thai traditional game

Abstract: Currently, Thai Traditional playing is almost disappearing. Thus, the main objective of this study is to conserve the Thai Traditional playing for the next generation to learn Thai Traditional playing online. Three-Dimensional Thai Traditional Game is the one of activities that is very beneficial in term of an entertainment and learning. The programming development of this game based on Macromedia flash and Interactive 3D games using Dark Professinal Basic. The number of players is only one player or more that is based on the type of playing. 37 students about 84.3% who play this game are very satisfaction. It can be concluded that the technology can apply for conserve the Thai Traditional playing sustainability.

A Holistic Policy for Stimulating Creative Economy

Abstract: This paper is an attempt to propose a holistic policy framework for stimulating creative economy in Thailand. It is expected to help reduce policy bewilder caused by the Thai government’s association of only ‘creativity’ and exclusively 15 creative industries to its definition of ‘creative economy’. The paper offers a definition of ‘creative economy’ and a holistic model of creative economy process, which are able to reflect and quantify overall economic activities of the creative economy. Under the model, two processes are indispensable from the overall process of creative economy creation; that is, the process of forming of knowledge, creativity and technology and the process of commercialising of creativity and technology. The entrepreneur is at the centre of the progression to commercialise creativity and technology created in the first process in the form of innovation in the second process. The government, economic, social and cultural institutions, and related policies could emit their effects on the above processes, both directly and indirectly. The model offers several policy implications including a holistic policy framework for stimulating creative economy, which is not confined to the creation of creativity and the only 15 creative industries defined by the

Novel radio resource management for high density chaotic wireless LANs

Abstract: It is well known that WLAN based on the IEEE 802.11 standard suffers from interference and scalability problems due to the limited number of non-overlapping channels. In order to mitigate the interference problem, channel assignment algorithms have been a popular research topic in recent years. It has been shown that such algorithms can greatly reduce the interference among wireless access points. However, in this paper we present our findings that traditional channel assignment algorithm can introduce a high hidden node index in high network density, thus greatly reducing the WLAN performance. We show that careful consideration needs to be taken when assigning channels using such algorithms. In addition, we propose a novel algorithm, called Cluster Channel Assignment (CCA), which is presented in the form of a state diagram. From our simulation results, we show that CCA can outperform traditional channel assignment in densely deployed scenarios, and is therefore a better alternative in such settings.