Tainan University of Technology

About: Tainan University of Technology is a education organization based out in Tainan City, Taiwan. It is known for research contribution in the topics: Password & Authentication. The organization has 311 authors who have published 641 publications receiving 10826 citations.

Chiral symmetry classes and Dirac nodal lines in three-dimensional layered systems

Abstract: We study the existence and stability of Dirac nodal lines in three-dimensional layered systems, whose layers individually have Dirac nodal points protected by chiral (sublattice) symmetry. The model system we consider is the rhombohedral stack of graphene layers with each layer subjected to a uniform external potential that respects either AIII or BDI classes. From the Hamiltonians in either classes, a pair of nontrivial spiraling Dirac nodal lines can be derived. The results are reasonable in accord to the topological classification of gapless phases for codimension $2$. The nodal lines approach each other as the magnitude of the potential increases, revealing their annihilation due to the fact that regarding the full system their topological invariants are cancelled out.

MS Location Estimation Based on the Artificial Bee Colony Algorithm.

Abstract: With the mature technology of wireless communications, the function of estimating the mobile station (MS) position has become essential. Suppressing the bias resulting from non-line-of-sight (NLSO) scenarios is the main issue for a wireless location network. The artificial bee colony (ABC) algorithm, based on the depiction of bee swarm’s foraging characteristics, is widely applied to solve optimization problems in several fields. Based on three measurements of time-of-arrival (TOA), an objective function is used to quantify the additional NLOS error on the MS positioning scheme. The ABC algorithm is adopted to locate the most precise MS location by minimizing the objective function value. The performance of the proposed positioning methods is verified under various error distributions through computer simulations. Meanwhile, the localization accuracy achieved by other existing methods is also investigated. According to the simulation results, accurate estimation of the MS position is derived and therefore the efficiency of the localization process is increased.

Combination linear lines of position and neural network for mobile station location estimation

Abstract: To enhance the effectiveness and accuracy of mobile station location estimation, author utilizes time of arrival measurements from three base stations and one angle of arrival information at the serving base station to locate mobile station in non-line-of-sight environments. This article makes use of linear lines of position, rather than circular lines of position, to give location estimation of the mobile station. It is much easier to solve two linear line equations rather than nonlinear circular ones. Artificial neural networks are widely used techniques in various areas due to overcoming the problem of exclusive and nonlinear relationships. The proposed algorithms employ the intersections of three linear lines of position and one angle of arrival line, based on Levenburg–Marquardt algorithm, to determine the mobile station location without requiring a priori information about the non-line-of-sight error. The simulation results show that the proposed algorithms can always provide much better location es...

System Development for the CAD/CAE Interface of Optical Design in TFT-LCD Light Guide Plate

Abstract: The light guide plate is the key component in a backlight unit of TFT-LCD, where point or line light source(s) is distributed evenly in two dimensional light guide plate. A light guide plate (LGP) has many refraction and/or scattering optical patterns on its bottom surface to transmit the light toward the display panel. The LGP performance can only be predicted by massive optical calculation of geometrical ray-tracing on the optical patterns. The challenge is to design and modify the parameters of thousands of optical patterns to achieve proper uniformity of the emanated light. An integrated design interface to improve the design efficiency is proposed in this paper. The optical pattern properties are all categorized to provide automatic generation of the 2-D and 3-D models of the optical pattern on LGP for ray-tracing analysis. Without this tool, the design process can be minute and complicated.

Retraction Note to: Randomized controlled trial testing weight loss and abdominal obesity outcomes of moxibustion.

Abstract: The Editors-in-Chief have retracted this article [1] because, after publication, concerns were raised regarding the study design and statistical analysis. Post-publication review has confirmed firstly that within-group changes were highlighted rather than between-group differences as appropriate for a randomized trial, and secondly that there are baseline differences between the groups that exist despite randomization for which analyses were not controlled. The data reported in this article are therefore unreliable. Ching-Hsiu Hsieh and Pei-Ying Chuang agree with this retraction. Chi-Chuan Tseng and Ju-Yu Shen have not responded to any correspondence from the publisher about this retraction.