Sirindhorn International Institute of Technology

About: Sirindhorn International Institute of Technology is a based out in . It is known for research contribution in the topics: Supply chain & Combustion. The organization has 1048 authors who have published 1678 publications receiving 30067 citations.

Robust implementation of hand gesture recognition for remote human-machine interaction

Abstract: A robust hand gesture recognition algorithm for remote human-machine interaction is proposed that has been optimized for implementation on an embedded platform. Hue-saturation-value (HSV) thresholding and unit-gradient vector (UGV) background subtraction methods are employed to overcome common issues related to variations in lighting conditions. Top-hat transformation is used to detect fingers and hand gestures, which are translated to command inputs for remotely controlling a media player. Experimental results demonstrate that the algorithm performs efficiently and accurately on an embedded board with an average computational cost of 143 millisecond per gesture and is robust to changes in illumination.

Polylactic acid/ethylene glycol triblock copolymer as novel crosslinker for epoxidized natural rubber

Abstract: Polylactic acid/ethylene glycol triblock copolymer (LLA46EG46LLA46) was prepared and used in a crosslink process of epoxidized natural rubber (ENR) by employing a ring-opening reaction using Sn(Oct)2 as a catalyst. The OH-capped copolymer acts as a macromolecular crosslinking agent in the formation of ENR networks, leading to drastic enhancement in tensile properties. Crosslink efficiency and chemical structures of the cured materials are examined by solvent fractionation, swelling experiments, XRD, 1H-NMR, and ATR-FTIR spectroscopy. The efficiency of the curing process is dependent on the ENR/copolymer feed ratios. The degree of property improvement and gas permeability/selectivity behaviors of the cured materials are strongly dependent on the copolymer content and the efficiency of the curing process. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Exact forms of effective elastic properties of frame-like periodic cellular solids

Abstract: This study presents the exact forms of the effective elastic constants of arbitrary frame-like periodic cellular solids that can be modeled accurately using Euler beams. The forms are derived analytically by using the homogenization method based on equivalent strain energy. In the derivation, the cross sections of all struts in a frame-like periodic cellular solid with an arbitrary topology are set to be the same and are also set to have the same moment of inertia in all directions. The exact forms of the effective elastic constants are obtained in terms of some dimensionless factors, the characteristic length and volume of the unit cell, the area and moment of inertia of the struts, and Young’s modulus of the base material. The dimensionless factors are dependent on the topology of the solid. In general, these factors can be functions of the area and moment of inertia of the struts. However, for numerous practical topologies, the factors are constant. In these cases, the obtained forms can be used as exact parametric forms. The constant factors for frame-like periodic cellular solids with a particular topology can be determined by exact curve fitting using numerical finite element results with different areas and moments of inertia of the struts. If exact fitting cannot be achieved beyond the fitting data, it follows that, for the topology being considered, some of the factors are not constant and the results of the curve fitting should not be used. To check the validity of the proposed exact forms of the effective elastic constants, they are used with several topologies of 2D and 3D frame-like periodic cellular solids. The obtained effective elastic constants are compared with exact solutions from elaborate symbolic finite element computations and/or the literature. When all dimensionless factors in the proposed exact forms are constant, the effective elastic constants obtained in this study are found to be exactly the same as the exact solutions.