Master of Science in Electrical Engineering, Cleveland State University, 2021, Washkewicz College of Engineering

In this thesis, we draw attention to the problem of cross-service attacks, that is, attacks that exploit information collected about users from one service to launch an attack on the same users on another service. With the increased deployment and use of what fundamentally are integrated-services networks, such as 4G/LTE networks and now 5G, we expect that cross-service attacks will become easier to stage and therefore more prevalent. As running example to illustrate the effectiveness and the potential impact of cross-service attacks we will use the problem of account association in 4G/LTE networks. Account association attacks aim at determining whether a target mobile phone number is associated with a particular online account. In the case of 4G/LTE, the adversary launches the account association attacks by sending SMS messages to the target phone number and analyzing patterns in traffic related to the online account. We evaluate the proposed attacks in both a local 4G/LTE testbed and a major commercial 4G/LTE network. Our extensive experiments show that the proposed attacks can successfully identify account association with close-to-zero false negative and false positive rates. Our experiments also illustrate that the proposed attacks can be launched in a way that the victim receives no indication of being under attack.

Committee: Ye Zhu (Committee Chair); Yongjain Fu (Committee Member); Sui-Tung Yau (Committee Member) Subjects: Computer Engineering; Computer Science; Electrical Engineering; Information Technology; Technology

Doctor of Philosophy, The Ohio State University, 2020, Civil Engineering

Vibration-based structural health monitoring (SHM) has become increasingly popular in recent years as a general and global method to detect possible damage scenarios. With the increase in the number of infrastructures that are in service beyond their initial design service age, more and more owners are relying on SHM to evaluate the integrity of their structures. As a result, SHM approaches that are applicable to a variety of structures with minimal service interruption and lower cost are of high importance. There are many research on SHM processes using a network of sensors placed on over a target structure. Although these approaches may result in more accurate results due to redundancy of the system, they are mostly cost prohibitive for currently in-service structures and are suitable for newly constructed projects with embedded sensors. This dissertation presents a feature-based SHM process using a new signal processing and feature extraction methodology and presents its application on a real-life vibration monitoring project completed of an energized substation structure. The new signal processing and feature extraction methodology uses specific filtering and optimization schemes which improved the performance in extracting features specifically when using a contaminated response signal. Next, the extracted features are used in a structural model updating to identify and localize the damage through an optimization process. Finally, a vortex-induced vibration analysis process is presented and applied to the real-life monitored structure. Currently there are no power utility industry standard methodology for the analysis and design of structures against wind-induced vibrations. The current codes or standards of practice recommend using damping devices such as chain dampers or strakes to mitigate the vibrations, when they are observed. This approach may not be feasible due to the energized in-service structures. In addition, modifications to the installed structure (open full item for complete abstract)

Committee: Abdollah Shafieezadeh (Advisor); Jieun Hur (Committee Member); Halil Sezen (Committee Member) Subjects: Engineering

Master of Arts, The Ohio State University, 2016, East Asian Languages and Literatures

The purpose of my research is to understand and explain the inner workings of both the Chinese Cell phone market and the Chinese Gaming industry. Furthermore, I plan on evaluating the working relation between these two markets through the similarities they share with Freemium profit structure. I will use these similarities to show how Freemium Profit structure is the most effective profit structure for both industries.

Committee: Xiaobin Jian Dr. (Advisor); Gala Walker Dr. (Committee Member) Subjects: Asian Studies; Marketing

Master of Arts, The Ohio State University, 2015, East Asian Languages and Literatures

Xiaomi, founded April 2010, within 4 years has already become the king of China's smartphones and even ranks third in global smartphone sales. This current paper explores the reasons for Xiaomi's explosion of popularity from six different angles: company development history, business operations strategy, competitive advantage, competitor analysis, potential obstacles to development and domestic market prospects. Through an in-depth analysis, this paper will explore the resistances faced by Xiaomi when entering foreign markets and how they were able to maintain foreign sales and health development. Finally, it will discuss some of the valuable lessons that Chinese enterprises expanding abroad and foreign enterprises entering China can learn from Xiaomi's success.

Committee: Xiaobin Jian (Advisor); Galal Walker (Committee Member) Subjects: Asian American Studies; Asian Studies; Behavioral Psychology; Behavioral Sciences; Business Costs; Computer Science; Foreign Language; Information Science; Information Technology; Intellectual Property; International Relations

Bachelor of Arts (BA), Ohio University, 2013, Art History

This thesis seeks to rethink the limits of documentary photography for the contemporary. Documentary, traditionally, concerns itself with the (re)presentation of factual information, constitutes a record. For decades, documentary – and especially social documentary – has been under siege; its ability to capture and convey and adequately represent “truth” thrown into question, victim to the aestheticization of the objects, fading trust in their authors, and technological development. This has opened up the possibility and perhaps the need to reconsider the conditions and purpose of documentary practice, and to consider the ways in which it has been impacted by recent technological and historical developments. The invention of the internet and the refinement of the (video) camera into ever more portable devices and finally into the smartphone, and the rise to ubiquity within society of these inventions, signifies a major shift in documentary. So, too, have certain events of the past two decades – namely, the beating of Rodney King (and the circulation of the video of that event) and the development and adoption of the occupation as a major tactic within the political left. This thesis will consider the impact of these developments on photography through both the practice of "copwatching" and the development of what could be understood as a "people's history" through images.

Committee: Louis-Georges Schwartz (Advisor); Jeanette Klein (Other); Vincent Caranchini (Other) Subjects: Art History; Political Science