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Effective M-Learning Design Strategies for Computer Science and Engineering Courses
No full textMobile learning (M-learning) is receiving more attention as a method of delivering to learners study materials anytime and anywhere. It is a necessity for educators to come up with a layout for learning that can be accessed through mobile devices. These learning materials should consist of good quality learning theories and accurate instructional layout in order to maintain the learning as effective as possible. It is important to follow certain strategies that can help the developers for M-learning applications. In this paper we proposed a set of strategies that are useful for creating mobile prototype for Computer Science and Engineering courses or M-learning application for course content
Righteous Fury: 1960s Black Strudent Activism at Harvard and Radcliffe
No full textThe black students at Harvard and other northern white colleges such as Columbia, Rutgers, and University of Pennsylvania would utilize black nationalist and militant organizational strategies in service of integrationist goals on campus. The black student struggles used the fiery rhetoric of nationalism, formed alliances with local community members of militant organizations, and thought of themselves as adherents of the nationalist ideology. They brilliantly and strategically exercised their agency by combining the two deeply embedded political traditions of radicalism and moderation in the course of the 1960s campus struggle
Country Risk and the Valuation of U.S.-Listedn Foreign IPOs
No full textThis study investigates the association of country risk with IPO valuations. Based on the law and finance literature, I hypothesize that firms domiciled in countries with higher country risk are worth less, other things equal. I test this hypothesis with a sample of international companies making their IPO debuts in the United States. The results indicate that several commonly used country-level variables can explain the observed IPO valuation differences across countries. In particular, the index of economic freedom, developed by the Heritage Foundation, and the Transparency International's corruption index have significant impact on IPO valuations. Specifically, IPO firms domiciled in countries with more economic freedom and less corruption are associated with higher valuation
Steganography in Text by Merge ZWC and Space Character
No full textSecure communication is essential for data confidentiality and integrity especially with the massive growth of the internet and mobile communication. Steganography is an art for data hiding by embedding the data to different objects such as text, images, audio and video objects. In this paper we propose a new algorithm for data hiding using Text Steganography in Arabic language. Our algorithm uses the Zero Width Character from Unicode (U+200B) and space character to pass bits before and after space. Main advantage of our algorithm file format will not be change and this will decrease the ability of Stegoanalysis to observe hidden data. Moreover ZWC algorithm can be applied to any language (ASCII, Unicode)
A New Analytical Performance Model for Cylindrical Microstrip Printed Antenna
No full textThis thesis is being archived as a Digitized Shelf Copy for campus access to current students and staff only. We currently cannot provide this open access without the author's permission. If you are the author of this work and desire to provide it open access or wish access removed, please contact the Wahlstrom Library to discuss permission.The fringing field is one of the parameters that have a great effect on the performance of microstrip printed antennas. The fringing field affects the resonance frequency and consequently affects all antenna parameters such as, input impedance, voltage standing wave ratio, return loss, electric and magnetic radiation fields, gain, efficiency, quality factor and bandwidth. In this thesis we present, a new analytical model for the effect of fringing field on the effective dielectric constant and on the resonance frequency of the microstrip printed antenna. The new model introduces full mathematical expressions for all antenna performance parameters as a function of curvature for a printed microstrip antenna. The model is also used in case of using an array consists of two elements of rectangular microstrip antenna. Mutual coupling coefficient between the elements is also given. The effect of temperature on a substrate material is presented. Effective dielectric constant and resonance frequency are calculated as a function of curvature and temperature. Hence, all antenna parameters as a function of wide range of temperature and curvature are introduced. The new model is used to calculate the parameters of a conformal substrate printed on a cylindrical body for TM10 and TM01 mode for a Giga Hertz range, 2.4 GHz and 5 GHz ranges. The substrate materials are RT/duroid-5880 PTFE, K-6098 Teflon/Glass, and Epsilam-10 ceramic-filled Teflon, commercially available substrate, and compare the result for different dielectric constant with the new model. Those materials contained Teflon and or ceramic which mean these materials are flexible so we can use those materials as substrate on conformal microstrip antenna. The dielectric constants for the used materials are 2.2, 2.5 and 10 respectively with a tangent loss 0.0015, 0.002 and 0.0004 respectively. Experimental results would confirm the accuracy of the analytical model. Furthermore, different antennas designs, their implementation and performance measurements are also presented
A High Performance and Efficient TCP Variant
No full textWith emergence of the latest technology and deployment of wireless mobile networks for data communication services, the need of the people has also been increased. There has been a significant effort to tune TCP for these networks. The performance of TCP is affected due to several factors including the congestion window, maximum packet size; retry limit, recovery mechanism, backup mechanism and mobility. The proposed TCP variants are successful in fixed networks but did not yield good results in a mobile wireless network. In this Work, we propose a new TCP variant named UB by integrating the features of TCP Westwood and Vegas. TCP-UB provides better performance than the other TCP variants from the mobility point of view. We have simulated our algorithm using NS2.28 which shows that TCP-UB achieves superior performance over TCP Vegas and Westwood
The Scribe
No full textThis is the February 2012 edition of The Scribe, Issue 5. The front page features an article on iPhones, as well as the UB Career Service Center’s new website. Additional articles include coverage of the women’s gymnastics team, the swim teams, and Darian David of the UB basketball team