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  • Hedayat Zarkoob, MSc Thesis Defence, Computing Science
    10:00 AM - 12:00 PM
    August 4, 2015
    M.SC. THESIS DEFENCE Hedayat Zarkoob B.Sc., Isfahan University of Technology, 2013, Iran Tuesday, August 4 th , 2015 10:00 a.m. TASC1 9204 West Title OPTIMIZING ONE-WAY CAR SHARING SYSTEMS Abstract In one-way car sharing systems picking up and returning the rental cars can be done at different stations. In these systems, since the customer demand is asymmetric, operators need to hire some staff to manually relocate the cars between stations to keep the system balanced. In this thesis, we address the problem of designing optimal relocation strategies for the one-way car sharing operators both in deterministic and stochastic settings. For the deterministic case, we give a minimum cost network flow formulation. To model the stochastic one, we use stochastic dynamic programming. Our theoretical results show that the exact optimal policy to relocate the cars in a two-station case is a threshold type policy. Based on this result, a heuristic algorithm is proposed to handle the m-station case. Our heuristic significantly decreases the computational complexity of the problem. Key words: One-way car sharing systems; Mathematical programming; Threshold type optimal policy. M.Sc. Examining Committee: Dr. Andrei Bulatov, Senior Supervisor Dr. Ramesh Krishnamurti, Supervisor Dr. Tim Huh, UBC, Supervisor Dr. Qianping Gu, Examiner Dr. Binay Bhattacharya, Chair
  • Samantha Bates, MA Thesis Defence, Criminology
    11:00 AM - 2:00 PM
    August 4, 2015
    Senior Supervisor: Dr. Brian Burtch Thesis Title: "Stripped": An Analysis of Revenge Porn Victims' Lives after Victimization Abstract: This study examines the experiences of 18 female revenge porn victims. To date, no other academic studies have exclusively focused on experiences of victimization in revenge porn cases. Researchers have focused on legal and moral aspects of revenge porn rather than on victims’ experiences. In-depth qualitative interviews were conducted between February 2014 and January 2015 with revenge porn victims to understand how they experienced victimization and its effects on their lives. Inductive analysis revealed seven main themes among the interviews: (1) emotional effects of revenge porn, (2) coping mechanisms, (3) relationships, (4) dealing with the law, (5) revenge porn as a gendered crime, (6) employment, and (7) intimate partner violence. The findings underscore the need for new policies and laws that would afford protection to revenge porn victims and the need for in-depth research on revenge porn victimology. Keywords : Revenge porn; feminism; cyberbullying; sexual harassment; sexual assault; qualitative research Location: Faculty Conference Room, SWH 10121
  • Bryce Westlake, PhD Thesis Defence, Criminology
    12:45 PM - 4:45 PM
    August 4, 2015
    Senior Supervisor: Dr. Martin Bouchard Thesis Title: The Criminal Career Evolution of Child Exploitation Websites: Identification, Survival, and Community Abstract: The distribution of child sexual exploitation (CE) material has been transformed by the emergence of the Internet. Efforts to combat distribution have been hindered by the prevalence and graphic nature of the material. One way to aid combating is to use automated data collection techniques to scan websites for CE-related criteria. Another is to contribute to proactive combat strategies by developing a theoretical framework to explain the evolution of CE distribution. Within this dissertation I develop a custom-designed webcrawler to collect data on hyperlinked networks containing CE websites and compare them to non-CE website networks. I then begin to develop a theoretical framework based on the criminal career paradigm and social network analysis to explain the evolution of website entities. Through the first study, I assess the effectiveness of a police CE-images database and 82 CE-related keywords at distinguishing websites within 10 CE-based networks from 10 sexuality and 10 sports networks. In the second study, I use a repeated measures design to compare baseline survival rates across the 30 collected networks. I then conduct Cox regression models, using criminal career dimensions adapted to website characteristics, to predict failure in CE-based networks. In the third study, I use the faction analysis to explore the formation of communities within CE-seeded networks and the characteristics that bind those communities. Results show that a) automated data collection tools can be effective, provided that the appropriate inclusion criteria is selected; b) a modified criminal career framework can be applied to CE websites, and their surrounding networks, to explain their evolution; c) individual-based criminal career dimensions can be transitioned to entity-based offenders (websites); d) websites within CE-seeded networks differ from non-CE-seeded networks in composition, survival, and network structure. The findings in this dissertation have implications for law enforcement strategies, private data-hosting services, CE researchers, and criminologists. Future research will refine inclusion criteria, expand to the Deep Web, and continue to develop an online criminal career framework. Keywords : Child sexual exploitation; criminal career; social network analysis; webcrawler; cybercrime; child pornography Location: Library Thesis Defence Room, LIB 2020
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