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.

Using Genetic Algorithms to Approximate Weighted Geometric Dilution of Precision

Abstract: As the internet and mobile device get universal, mobile positioning in wireless communication becomes an important application. The wireless signal is influenced by many factors. Fading effect and multipath propagation increase the signal propagation time and change the angle of the received signal. All of these reduce mobile positioning accuracy. In line-of-sight (LOS) system, a signal can be measured precisely. However, there are many obstacles between a mobile station (MS) and a base station (BS) in the real environment. It causes non-line-of-sight (NLOS) effect. NLOS is a major factor that causes errors in mobile positioning. Although NLOS influences the signal propagation, these effects can be reduced. To enhance positioning accuracy, we choose the BS with the least error to estimate the mobile position by calculating the geometric dilution of precision (WGDOP), which is a value to quantify positioning performance. A WGDOP small value represents high accuracy. Using WGDOP to select the best combination of BSs improves MS positioning accuracy. Because the calculation of WGDOP is complex, it is a great burden on a device and spends lots of time. To reduce the load of devices, an approximation method based on genetic algorithm (GA) is proposed to derive WGDOP value efficiently.

Spatial Topology Retrieval: A Visual Approach for Encoding and Indexing Spatial Topology in an Architectural Design Case Library

Abstract: This paper aims to develop a visual tool named Spatial Topology Retrieval (STR) for integrating a physical-based spatial allocation tool, which offers a visual interactive interface for architectural space layout in the early design stage, into an online case library of architectural design, which is based on rational database technology with ontology-based authoring tools of metadata of case features. STR provides the case library with a tool for indexing and retrieving the plane views of a given architectural design case.

A Reliable Screening Test to Predict Liver Injury in Pediatric Blunt Torso Trauma

Abstract: We determined the validity of serumaspartate aminotransferase (AST) and alanine aminotransferase(ALT) as screening tests in the identificationof liver injuries in pediatric torso trauma patients. We conducted a retrospective study inpediatric patients 200 IU/l or an ALT> 125 IU/l are strong predictors of liver injury in childrensustaining blunt torso trauma. We recommend theroutine use of serum transaminase levels as screeningtests in hemodynamically stable patients.

A novel design of node-disjoint multi-path QoS routing in multi-hop ad hoc networks

Abstract: Recently, quality-of-service routing in dynamic, wireless multi-hop ad hoc networks becomes a hot research topic, and various QoS protocols are proposed However, popular QoS routing protocols rarely provide multiple routes Once links break due to node mobility, establishment of new routes leads to large control overhead and extra end-to-end delay We design a quality-of-service routing protocol, containing efficient bandwidth estimations, admission control and node-disjoint multipath establishment While detecting link breaks, we use back-up routes to avoid another wasteful route discovery If a single route with sufficient bandwidth can not be discovered, we combine multiple routes to support QoS transmission

Assessing generalized linear mixed models using residual analysis

Abstract: A nonparametric smoothing method for assessing the adequacy of gener- alized linear mixed models (GLMMs) is developed. The proposed method is based on smoothing the residuals over continuous covariates to avoid the partition of continuous covariates on model checking. The global test statistic has a quadratic form and its for- mulae of expectation as well as variance are derived. The sampling distribution of the quadratic form test statistic is approximated by a scaled chi-squared distribution. For bandwidth selection, the leave-one-out cross-validation approach is recommendable for use. A longitudinal binary data set is utilized to demonstrate the proposed approach. 1. Introduction. The analysis of longitudinal data has been remarkably ourished in the public health and social sciences for years. Longitudinal studies are employed to