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2005 Graduate Catalog and 2004 Annual R & D Report Sirindhorn International Institute of Technology (SIIT) been studied by conducting experiments on a polymeric model that has a similar but less complex structure. The latter is investigated by employing a novel polymer blend methodology. . Conventional and Two-Dimensional FTIR Spectroscopy Infrared spectroscopy is a fundamental analytical technique that is widely used in material characterization. Recently, an advanced methodology, twodimensional infrared spectroscopy (2D-IR) has been developed as a novel data analysis and presentation technique. This technique has provided notable advantages over conventional FTIR. For example, an improvement in band resolution, simplicity in band assignment, and determination of relative order of responses of specific functional groups to external perturbation, have been achieved. The 2D-IR has been applied to study effects of mechanical and electrical perturbations on the structural transition of PVDF/TrFE/CTFE piezoelectric polymer, and investigate crystallization of biodegradable polymer, poly(lactides). Dr. Ruben N. Mera Assistant Professor (Joined SIIT in March 2005) B. Math, University of the Republic Montevideo, Uruguay M.Sc. Mathematical Statistics, CIENES, Santiago, Chile D.E.A. Probability, University of Paris VI, France Ph.D. Mathematics, Auburn University, Alabama, USA Areas of Specialization: Complex-survey designs, Complex variables. Research Interests: Complex-Survey Designs and Estimation A complex-survey design incorporates elements such as stratification, clustering, unequal inclusion probabilities, and weighting, among others. Under a complex design, observations do not follow the standard assumptions of Independent Identically Distributed (IID) observations of classic statistical analysis. Missing values induce bias, and imputation contributes to inflate variances. The way these different factors interact is not well known. Survey designs must integrate all the components of the population structure. Estimation and variance estimation must account for all the complexities of the design. Disclosure Avoidance Government agencies are required to protect respondents’ confidentiality, both to comply with law requisites as well as to insure an accurate data collection. The public release of microdata prompts the risk of identification of a respondent by a third party. Masking techniques, such as data disturbance or swapping, to avoid the linking of observations to respondents, are typical methods to prevent identity disclosure. Masking procedures, however, distort the data and induce bias. The challenge is to produce public data files that are representative of the population and, at the same time, insure the respondents’ privacy. Entire Functions of Order Larger than One The theory of nonharmonic Fourier series is concerned with the completeness and expansion properties of sets of complex exponentials. Its origins lie in the celebrated works of Paley and Wiener and of Levinson. In recent years, in response to the growing interest in Banach spaces, research in this area has flourished. An entire function of order r is an analytic function in the complex plane satisfying |f(z)| < exp(|z| r+e ) for all e > 0 but for no e < 0, and for sufficiently large values of |z|. The growth of such functions is restricted by their growth along the real axis. Dr. Thawatchai Onjun Lecturer (Joined SIIT in October 2004) B.S. in Physics, University of Rochester, Rochester, New York, USA M.S. in Physics, Lehigh University, Bethlehem, Pennsylvania, USA Ph.D. in Physics, Lehigh University, Bethlehem, Pennsylvania, USA Areas of Specialization: Theoretical and computational plasma physics. Research Interest: Theoretical and Computational Plasma Physics Fusion-related research with focus on thermal and particle transport such as predicting the time evolution of temperature and density profiles in tokamaks using an integrated modeling approach. Integrated modeling is an important element of tokamak fusion research that contributes in an essential way to the interpretation and planning of experiments, validation of theory against experimental results, development of plasma control techniques, and the design of next step devices such as ITER. Research is closely related to ongoing and proposed experiments at major fusion laboratories. 38
2005 Graduate Catalog and 2004 Annual R & D Report Sirindhorn International Institute of Technology (SIIT) Dr. Winyu Rattanapitikon Associate Professor B.Eng. in Agricultural Engineering, Khon Kaen University, Khon Kaen, Thailand M.Eng. in Water Resources Development, Asian Institute of Technology (AIT), Thailand D.Eng. in Civil Engineering, Yokohama National University, Yokohama, Japan Areas of Specialization: Mathematical modeling, Coastal engineering. Research Interest: Mathematical Modeling for Cross Shore Sediment Transport and Beach Deformation under Regular and Irregular Waves Many numerical models had been developed to compute sediment transport rate. However, most of the models were developed under limited experimental conditions. Therefore their validity is limited according to the range of experimental conditions which were employed in the calibration. The evidence is that many models exist. The main objective of this research is to develop a reliable sediment transport model based on a wide range of experimental conditions. Dr. Wisit Singhsomroje Lecturer A.B. in Physics, Cornell University, Ithaca, New York, USA M.Sc. in Physics, Brown University, Providence, Rhode Island, USA Ph.D. in Physics, Brown University, Providence, Rhode Island, USA Area of Specialization: Picosecond Ultrasonics Experiments, Acoustic Solitons in Crystalline Media. Research Interest: Picosecond Ultrasonics and Acoustic Solitons in Crystalline Media Picosecond ultrasonics is an experimental technique in which a pulsed laser is used to generate and detect acoustic pulses in solid or liquid media. Acoustic pulses generated by the laser travel inside the media until they are detected. By this time, certain physical properties of the media have modified the shape of the acoustic pulses. The changes in shape of the pulses indicate many physical phenomena. Soliton formation, which is an effect of the dispersion and non-linearity, is one of them. Solitons generated this way in a cubic crystal at low temperature (24 K) have frequencies of up to at least 700 GHz and a very low attenuation rate over the path of a few millimeters. The experimental results are supported by the KdV equation, which describes non-linear waves in dispersive media. Simulations based on this equation in one dimension are implemented to test the data. 39
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