Scholarship @ UWindsor
Scholarship @ UWindsor is the institutional repository of the University of Windsor (UWindsor), showcasing and preserving the UWindsor community’s scholarly outputs, as well as items from the Leddy Library’s Archives & Special Collections. Its mission is to disseminate and preserve knowledge created or housed at the University of Windsor.
Contact scholarship@uwindsor.ca for more information.
Error fetching top-level communities
Recent Submissions
Quasi-Dedicated Path Protection in OFDM Networks
(2016-01-01) Jethaliya, Pratik; Bandyopadhyay, Subir
Optical networks have become the de-facto standard for backbone networks due to the large bandwidth, fault-tolerance and other advantages of optical communication. Orthogonal Frequency Division Multiplexing (OFDM) has been proposed recently as a promising technology to improve the utilization of the huge bandwidth of optical fibers. When designing optical networks, path protection is a well-known approach to ensure reliable communication, even in the presence of faults in the network. In this research we have proposed a approach that attempts to increase the throughput of optical networks using OFDM, by reconfiguring the backup lightpaths when the network is heavily congested. When a network cannot handle a new request for communication, we reconfigure the existing backup paths to enable the setting up of a primary lightpath and a backup lightpath to handle the new request. We have studied the network performance using simulation.
An Approach of Facial Expression Modeling with Changing Trend in the History of Belief States
(2016-01-01) Kaur, Karamjeet; YUAN, XIAOBU
An Embodied Conversational Agent (ECA) is an intelligent agent that interacts with users through verbal and nonverbal expressions. When used as the front-end of software applications, these agents provide online assistance that transcends the limits of time, location, and even language. To help improve user experience, there is an increasing need to make ECA more realistic, which can be achieved by using more naturalistic facial expressions. The proposed thesis research is going to work on the modeling of facial expressions based on the changing trend in the history of belief states and fuzzy logic. This work enhances the software customization system developed previously in our research group with a modification that links the changing value of belief states with the change of emotion expressions at both the mode and scale levels. In addition, the operation of the proposed method is implemented in an online bookstore system, and its success is verified with a usability study.
An Efficient FPGA Implementation of Optical Character Recognition System for License Plate Recognition
(2016-01-01) Jing, Yuan; Mirhassani, Mitra
Optical Character Recognition system (OCR) has been found very useful in the field of intelligent transportation. In this work, a FPGA-based OCR system aimed at image-based License Plate Recognition (LPR) has been designed and tested. A feed-forward neural networks has been chosen as the core of the proposed OCR system. The neural network parameters are acquired beforehand and will not change during its operation time. A set of Matlab programs have been made in the network's design process. The verification process includes Matlab simulation where programs using binary numbers which has the same representation format as the system are used to compute the results, and Modelsim simulation where data is computed and transferred between modules under clock signals' control. The synthesis process is done in the Altera's FPGA design software - Quartus II. The result shows that calculation speed of the system implemented in hardware is much faster than software running on a PC while it maintains a high recognition accuracy. The proposed image recognition system is used with a set of images that are generally difficult for such networks to handle. Most images include shadows and other imperfections in the image. The proposed network was able to achieve $95 %$ accuracy in recognizing the correct character despite the image imperfections. Moreover, it takes advantage of very compact and efficient non-liner sigmoid function.
Perceived Organizational Discrimination. Its Societal Antecedents, Individual Outcomes, and the Effects of Organizational Culture across Contexts
(2016-01-01) Kartolo, Arief Banindro; Kwantes, Catherine
Research has found that perceived discrimination leads to a range of negative outcomes across various contexts. In the societal context, it is associated with stress, mental health related issues, and a decrease in quality of life (Tummala-Narra et al., 2011). In the organizational level, it is negatively linked with psychological well-being, job satisfaction, job attitude, and turnover intention (Shaffer et al., 2000; Triana et al., 2015). Although there is an abundance of research looking into factors that mitigate the impact of perceived discrimination in the workplace, there is a lack of research that looks into the antecedents of perceived discrimination in an organizational context. This research project looked into the association of perceived discrimination between societal and organizational contexts, its impact on psychological well-being, and turnover intention. Furthermore, this research predicted that organizational culture (i.e. constructive culture norms, passive-defensive culture norms, aggressive-defensive culture norms) affects the association of perceived societal and organizational contexts. Overall, a weak but significant correlation was found on the relationship between perceived societal and organizational discrimination, but the culture of an organization did not impact the association of perceived discrimination between contexts. However, the culture of an organization made a contribution on predicting perceived discrimination in the workplace. Constructive culture norms were found to significantly reduce, while aggressive-defensive culture norms were found to significantly increase an individual’s perception of discrimination in the workplace; passive-defensive culture norms, on the other hand, did not have significant impact to predict perceived organizational discrimination. Consistent with previous literature, perceived discrimination in the workplace predicted an individual’s psychological well-being and turnover intention.
Increasing Efficiency of Ti-6Al-4V Machining by Cryogenic Cooling and using Nanolubricants
(2016-01-01) Krishnamurthy, Girish; Alpas, Ahmed T.
Generation of high localized cutting zone temperatures leading to dissolution wear hinders machinability of Ti alloys using uncoated carbide tools and polycrystalline diamond (PCD) tools. In addition, the thermo-plastic instability exhibited by titanium alloys promotes serrated chip formation that causes fluctuations in the cutting forces leading to chatter and severe flank wear. This work considers two methods to mitigate these problems during cutting of Ti-6Al-4V, namely, cryogenic machining to influence chip segmentation, and the use of WS2 blended metal removal fluids (MRF) to influence interface coefficient of friction (COF). Cryogenic machining of Ti-6Al-4V at 45 m/min and 0.15 mm/rev led to easier fracture of chip segments due to decrease in toughness of the material. Analyses of fracture surfaces of the chips showed that the decrease in toughness was due to increased presence of shear ridges at low temperatures. The role of COF was determined using pin-on-disk experiments. Iterative tests of Ti-6Al-4V pins sliding against uncoated WC-Co disk showed that the addition of WS2 nanoparticles to MRF are capable of decreasing the interface COF lower than that under MRF lubricated conditions alone. Orthogonal machining of Ti-6Al-4V at a cutting speed of 29.5 m/min, feed rate of 0.4 mm/rev under dry conditions generated an average cutting force of 400 N. Under MRF + WS2 lubricated conditions, the average cutting force reduced to 190 N, which was 52% lower than dry conditions. The low COF values due to the MRF + WS2 lubricant reduces the interface temperature and thus aids in machining.