National Taiwan University of Science and Technology

About: National Taiwan University of Science and Technology is a education organization based out in Taipei, Taipei, Taiwan. It is known for research contribution in the topics: Fuzzy logic & Control theory. The organization has 16288 authors who have published 21577 publications receiving 426294 citations. The organization is also known as: Taiwan Tech & Taiwantech.

Analysis and Application of Grey Relation and ANOVA in Chemical–Mechanical Polishing Process Parameters

Abstract: The parameters for chemical-mechanical polishing (CMP) in an ultra-large scale integrated (ULSI) planarisation process are explored. First, an analysis of variance (ANOVA) is conducted on the CMP process parameters derived from the Taguchi method. The objective is to understand the ranking of the effects of CMP parameters such as down force pressure, platen speed, carrier speed, oscillation, and flowrate on the removal rate. Findings are verified by grey relational analysis. The values of the sequencing results allow us to adjust the parameters to the required machining condition during the CMP experiment. This will reduce the number of experiments needed and the length of time required. This study also analyses the effect of data normalisation and data integrity in grey relational analysis on the degree of sensitivity. The results indicate that it is feasible to use grey relational analysis to predict the rank of the parameter effect in the case of insufficient data derived from the Taguchi method.

Compressive Behavior of Steel-Fiber-Reinforced Concrete with a High Reinforcing Index

Abstract: Compression tests on cylinders were performed to characterize the compressive stress-strain behavior of steel fiber-reinforced concrete (SFRC) with a high reinforcing index. The reinforcing index, defined as the product of the volume fraction and the aspect ratio of the fibers, of steel fibers examined was as high as 1.7. Hooked-end fibers of various lengths and aspect ratios were considered. The test results indicated that a higher reinforcing index was associated with a higher strain at the peak stress and a higher toughness of SFRC, up to a reinforcing index approximately equal to that corresponding to a 2% fiber volume fraction. Adding steel fibers had little effect on the modulus of elasticity and compressive strength of SFRC. Long steel fibers and fibers with a lower aspect ratio resulted in a larger increase of the toughness of SFRC. On the basis of the test results, analytical models of the stress-strain curve in compression and toughness of SFRC with a reinforcing index up to 1.7 are developed.

A CuO nanowire infrared photodetector

Abstract: The authors report the growth of CuO nanowires on an oxidized Cu wire and the fabrication of CuO infrared photodetector. By annealing the Cu wire at 500 °C in air for 2 h, high density CuO nanowires with an average length of 1.2 μm and an average diameter of 50 nm were successfully grown vertically on the CuO wire. Using an 808 nm laser diode as the excitation source, it was found that rise-time and fall-time of the fabricated CuO infrared photodetector were 15 and 17 s, respectively, when measured in vacuum.