7,348 research outputs found
Piecewise regression for fuzzy input-output data with automatic change-point detection by quadratic programming
No full text[[abstract]]To handle the large variation issues in fuzzy input-output data, the proposed quadratic programming (QP) method uses a piecewise approach to simultaneously generate the possibility and necessity models, as well as the change-points. According to Tanaka and Lee [ H. Tanaka, H. Lee, Interval regression analysis by quadratic programming approach, IEEE Transactions on Fuzzy Systems 6 ( 1998) 473-481], the QP approach gives more diversely spread coefficients than linear programming ( LP) does. However, their approach only deals with crisp input and fuzzy output data. Moreover, their method is weak in handling fluctuating data. So far, no method has been developed to cope with the large variation problems in fuzzy input-output data. Hence, we propose a piecewise regression for fuzzy input-output data with a QP approach. There are three advantages in our method. First, the QP technique gives a more diversely spread coefficient than does a linear programming technique. Second, the piecewise approach is used to detect the change-points in the estimated model automatically, and handle the large variation data such as outliers well. Third, the possibility and necessity models with better fitness in data processing are obtained at the same time. Two examples are presented to demonstrate the merits of the proposed method. (C) 2009 Elsevier B. V. All rights reserved.[[note]]SC
Synthesis of ruthenium triazolato and tetrazolato complexes by 1,3-dipolar cycloadditions of ruthenium azido complex with alkynes and alkenes and regiospecific alkylation of triazolates
No full textNon-uniformly sampled mosaic construction using resolution map
No full textA new type of mosaic is suggested: a non-uniformly sampled mosaic to minimise the loss of image data occurring by coordinate transformations. A resolution map is introduced in order to measure the spatially variant number of samples. By using an appropriate method of blending and interpolation, we construct a non-uniformly sampled mosaic. Simulation results show an increase in the image quality of the frames reconstructed from the non-uniformly sampled mosaic
An ultraprecision stage for alignment of wafers in advanced microlithography
No full textWe present an ultraprecision stage specially designed to align wafers for the microlithography of integrated circuit patterns of sub-0.3 mu m design rules. The whole stage mechanism is composed of two individually operating xy theta-stages: a global stage to provide initial coarse alignment of wafers in stepping mode; and a micro stage to produce fine controlability in nanometer range. The global stage is configured with three linear motors kinematically linked to produce xy theta-motions without resorting to precision guideways. The micro stage corrects positional errors in the global stage by activating three piezoelectric microactuators housed in an elastic flexure. These two stages are simultaneously controlled as a dual servo system, because the main emphasis is given to achieving an overall positioning reproducibility of 20 nanometers in xy theta-motions in aligning wafers of 200-mm size. (C) 1997 Elsevier Science Inc
A Flexible Preprocessing System for NASTRAN: Neutral Geometric Data Base Approach to Integrated CAD
No full text
New method to improve thermal stability in the interface of silicon and tungsten by the interposition of plasma deposited tungsten nitride thin film
No full textThermally stable tungsten nitride/tungsten bilayer has been proposed for the application of metallization. This bilayer is sequentially formed by plasma enhanced chemical vapor deposition without breaking vacuum. The Rutherford backscattering spectrometry and cross-sectional transmission electron microscopy reveal that the interaction between the W and Si substrate can be prevented by interposing a 800-Angstrom-thick W67N33 layer. The W67N33/W bilayer maintains the integrity of the interface during annealing at 850 degrees C for 30 min without the formation of Si2W and interdiffusion phenomena. Sheet resistivity of the W67N33/W bilayer is gradually decreased from 17 to 12 mu Omega cm at annealing temperatures up to 850 degrees C
Microstructural analysis of ZnO/ZnS nanocables through Moire fringe induced by overlapped area of ZnO and ZnS
No full textUnique ZnO/ZnS nanocables were synthesized by the catalyst-free simple thermal vapor transport method. Using the high-resolution transmission electron microscopy, the interface and defect structures of nanocables were investigated. The nanocables were composed of two discrete structures, which grow along [0002] or [0 (1) over bar 10] directions in wurtzite and [200] direction in sphalerite structures. Two-dimensional Moire fringes appeared in the core area due to a different interplanar spacing between ZnO and ZnS. In the nanocables grown along [0002] and [0 (1) over bar 10] direction, stacking faults, which lie in (0002) and (0 (1) over bar 10) planes were observed likewise the identical defects were also found in the (111) plane of the sphalerite structure. This work includes an in-depth discussion regarding the structure and the growth of ZnO/ZnS nanocables. (c) 2006 Elsevier B.V. All rights reserved
- …
