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RISS 인기검색어
- 검색키워드
- 저자 : Shih D. Y, (검색결과 14 건)
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A convex version of multivariate adaptive regression splines
Martinez, D.L.,Shih, D.T.,Chen, V.C.P.,Kim, S.B. North-Holland Pub. Co ; Elsevier Science Ltd 2015 Computational statistics & data analysis Vol.81 No.-
Multivariate adaptive regression splines (MARS) provide a flexible statistical modeling method that employs forward and backward search algorithms to identify the combination of basis functions that best fits the data and simultaneously conduct variable selection. In optimization, MARS has been used successfully to estimate the unknown functions in stochastic dynamic programming (SDP), stochastic programming, and a Markov decision process, and MARS could be potentially useful in many real world optimization problems where objective (or other) functions need to be estimated from data, such as in surrogate optimization. Many optimization methods depend on convexity, but a non-convex MARS approximation is inherently possible because interaction terms are products of univariate terms. In this paper a convex MARS modeling algorithm is described. In order to ensure MARS convexity, two major modifications are made: (1) coefficients are constrained, such that pairs of basis functions are guaranteed to jointly form convex functions and (2) the form of interaction terms is altered to eliminate the inherent non-convexity. Finally, MARS convexity can be achieved by the fact that the sum of convex functions is convex. Convex-MARS is applied to inventory forecasting SDP problems with four and nine dimensions and to an air quality ground-level ozone problem.
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Damage detection in truss bridges using vibration based multi-criteria approach
Shih, H.W.,Thambiratnam, D.P.,Chan, T.H.T. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.2
This paper uses dynamic computer simulation techniques to develop and apply a multi-criteria procedure using non-destructive vibration-based parameters for damage assessment in truss bridges. In addition to changes in natural frequencies, this procedure incorporates two parameters, namely the modal flexibility and the modal strain energy. Using the numerically simulated modal data obtained through finite element analysis of the healthy and damaged bridge models, algorithms based on modal flexibility and modal strain energy changes before and after damage are obtained and used as the indices for the assessment of structural health state. The application of the two proposed parameters to truss-type structures is limited in the literature. The proposed multi-criteria based damage assessment procedure is therefore developed and applied to truss bridges. The application of the approach is demonstrated through numerical simulation studies of a single-span simply supported truss bridge with eight damage scenarios corresponding to different types of deck and truss damage. Results show that the proposed multi-criteria method is effective in damage assessment in this type of bridge superstructure.
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Optical metrology of randomly-distributed Au colloids on a multilayer film
Hsu, Shih-Hsin,Chang, Yia-Chung,Chen, Yi-Chun,Wei, Pei-Kuen,Kim, Y. D. The Optical Society 2010 Optics express Vol.18 No.2
<P>Spectroscopic ellipsometry (SE) measurements coupled with efficient theoretical modeling and scanning electron microscopy analysis are used in the metrology of randomly-distributed gold nanoparticles on a multilayer film. Measurements were conducted in the ultraviolet to near infrared region at several angles of incidence. To understand the size, shape, and distribution of nanoparticles, a finite-element Green's function approach considering the scattering from multiple nanoparticles was employed to calculate the ellipsometry parameters. Our calculations are in fair agreement with the ellipsometry measurements when suitable size, shape, and distribution pattern of nanoparticles are found. This demonstrates that SE could be a useful tool to the metrology of arbitrarily-distributed nanoparticles on a multilayer film.</P>
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Damage detection in truss bridges using vibration based multi-criteria approach
H.W. Shih,D.P. Thambiratnam,T.H.T. Chan 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.2
This paper uses dynamic computer simulation techniques to develop and apply a multicriteria procedure using non-destructive vibration-based parameters for damage assessment in truss bridges. In addition to changes in natural frequencies, this procedure incorporates two parameters, namely the modal flexibility and the modal strain energy. Using the numerically simulated modal data obtained through finite element analysis of the healthy and damaged bridge models, algorithms based on modal flexibility and modal strain energy changes before and after damage are obtained and used as the indices for the assessment of structural health state. The application of the two proposed parameters to truss-type structures is limited in the literature. The proposed multi-criteria based damage assessment procedure is therefore developed and applied to truss bridges. The application of the approach is demonstrated through numerical simulation studies of a single-span simply supported truss bridge with eight damage scenarios corresponding to different types of deck and truss damage. Results show that the proposed multi-criteria method is effective in damage assessment in this type of bridge superstructure.
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Sadowski, Bartłomiej,Su, Shih-Hao,Lin, Ta-Chun,Lohrey, Trevor D.,Deperasiń,ska, Irena,Chou, Pi-Tai,Gryko, Daniel T. The Royal Society of Chemistry 2018 Journal of materials chemistry. C, Materials for o Vol.6 No.45
<P>Despite being highly emissive in solution, aggregation of dipyrrolonaphthyridinedione (DPND) molecules typically results in the quenching of fluorescence. DPNDs can be efficiently converted into π-extended derivatives containing rotatable aryl rings <I>via</I> a direct arylation methodology. The presence of phenyl substituents at positions 3 and 9 of the DPND core is sufficient to cause moderate fluorescence in the solid state. When tetraphenylethylene moieties, typical aggregation induced emitters, are coupled through biaryl linkages in these same positions, a 50 nm shift in absorption and almost 120 nm shift in fluorescence compared to the parent DPND is observed. The radiative S1 → S0 transitions have large oscillator strengths regardless of whether phenyls or tetraphenylethylene groups are coupled to DPND and strong orange or red emission in solution is observed. Vibrations involving these substituents play an important role in the dissipation of the electronic excitation energy. X-ray crystallographic studies revealed that although the distance between DPND cores is strikingly larger in bis(TPE)2DPND compared to that in diphenylDPND, their photophysical properties in the solid state are very similar. Computational studies have also shown that, in contrast to our experimental results, neither of these DPNDs should be particularly emissive in the solid state, due to the low oscillator strengths calculated for model dimers derived from their X-ray crystal structures.</P>
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Genomic and Functional Approaches to Understanding Cancer Aneuploidy
Taylor, Alison M.,Shih, Juliann,Ha, Gavin,Gao, Galen F.,Zhang, Xiaoyang,Berger, Ashton C.,Schumacher, Steven E.,Wang, Chen,Hu, Hai,Liu, Jianfang,Lazar, Alexander J.,Cherniack, Andrew D.,Beroukhim, Ram Elsevier Science B.V., Amsterdam 2018 Cancer cell Vol.33 No.4
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Seo, S.K.,Kang, S.K.,Shih, D.Y.,Lee, H.M. Pergamon Press 2009 Microelectronics and reliability Vol.49 No.3
The changes in microstructure and microhardness of Sn-0.5Ag, Sn-1.0Ag, and Sn-0.7Cu Pb-free solders were investigated during high temperature aging at 200<SUP>o</SUP>C. As-solidified microstructures, revealed by cross-polarized light microscopy, consist of relatively large Sn grains in both Sn-Ag and Sn-Cu solders. Upon aging at 200<SUP>o</SUP>C, 2h, Sn grains become smaller compared to the as-solidified ones. In addition, the microhardness of Sn-Ag solders increases after 200<SUP>o</SUP>C, 2h aging, while that of Sn-Cu solder decreases. Detailed observation of the coarsening and redistribution of intermetallic particles in each system further explains this response of mechanical properties during high temperature aging. To investigate the effect of aging temperature, solders were aged at a lower temperature, 150<SUP>o</SUP>C for up to 1000h and compared with aging at 200<SUP>o</SUP>C. The microstructural changes during the high temperature aging were characterized in terms of Sn grain size, crystal orientation, and IMC growth kinetics, and were further correlated with the changes of their mechanical properties.
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