Digital Commons Network^™

Ultra-Diffuse And Ultra-Compact Galaxies In The Frontier Fields Cluster Abell 2744, Steven Janssens, Roberto Abraham, Jean Brodie, Duncan Forbes, Aaron Romanowsky, Pieter Van Dokkum

Faculty Publications

We report the discovery of a large population of ultra-diffuse galaxies (UDGs) in the massive galaxy cluster Abell 2744 (z = 0.308) as observed by the Hubble Frontier Fields program. Since this cluster is ~5 times more massive than Coma, our observations allow us to extend 0.7 dex beyond the high-mass end of the relationship between UDG abundance and cluster mass reported by van der Burg et al. Using the same selection criteria as van der Burg et al., A2744 hosts an estimated 1961 ± 577 UDGs, 10 times the number in Coma. As noted by Lee & Jang, A2744 …

Assessing The Efficiency Of Mass Transit Systems In The United States, Hokey Min

Mineta Transportation Institute

Frustrated with increased parking problems, unstable gasoline prices, and stifling traffic congestion, a growing number of metropolitan city dwellers consider utilizing the mass transit system. Reflecting this sentiment, a ridership of the mass transit system across the United States has been on the rise for the past several years. A growing demand for the mass transit system, however, necessitates the expansion of service offerings, the improvement of basic infrastructure/routes, and the additional employment of mass transit workers, including drivers and maintenance crews. Such a need requires the optimal allocation of financial and human resources to the mass transit system in …

Design Concept For A Failover Mechanism In Distributed Sdn Controllers, Nathan Kong

Master's Projects

Software defined networking allows the separation of the control plane and data plane in networking. It provides scalability, programmability, and centralized control. It will use these traits to reach ubiquitous connectivity. Like all concepts software defined networking does not offer these advantages without a cost. By utilizing a centralized controller, a single point of failure is created. To address this issue, this paper proposes a distributed controller failover. This failover will provide a mechanism for recovery when controllers are not located in the same location. This failover mechanism is based on number of hops from orphan nodes to the controller …

Mining Frequency Of Drug Side Effects Over A Large Twitter Dataset Using Apache Spark, Dennis Hsu

Master's Projects

Despite clinical trials by pharmaceutical companies as well as current FDA reporting systems, there are still drug side effects that have not been caught. To find a larger sample of reports, a possible way is to mine online social media. With its current widespread use, social media such as Twitter has given rise to massive amounts of data, which can be used as reports for drug side effects. To process these large datasets, Apache Spark has become popular for fast, distributed batch processing. In this work, we have improved on previous pipelines in sentimental analysis-based mining, processing, and extracting tweets …

Methods, Effect And Challenges Of Library Instruction In Academic Libraries, Saturday U. Omeluzor, Alarape Asimi Akibu Ph.D, Sunday Ikhimeakhu Dika, Clement Chinemerem Ukangwa

Library Philosophy and Practice (e-journal)

This study investigated library instruction methods, effect and the challenges in academic libraries using the Federal University of Petroleum Resources Effurun (FUPRE) students as the target population. Library instruction is a core activity of academic libraries that entails educating, enlightening, guiding and helping the library users to identify, understand and utilize library information resources effectively. A survey research design was adopted for the study. The population is consisted of seven hundred and seventy-three 100 level students who registered for Use of Library (GSE 112) course in the first semester of 2015/2016 academic session. Questionnaire was the instrument used for data …

Citation Analysis Of Doctoral Theses References As A Tool For Collection Management In History: A Study Of Panjab University, Chandigarh (India), Preeti Mahajan, Anil Kumar

Library Philosophy and Practice (e-journal)

A citation analysis study was carried out on the citations appended in the end of History discipline Ph.D. dissertations to ascertain what types of documents are the most frequently used in the research process, the most commonly consulted core journals and obsolescence rate of the journals and books. The study analysed 8488 citations appended in the 36 Ph.D. theses of History discipline submitted to Panjab University, Chandigarh, for the award of doctoral degree during 2002-2012. The results obtained from the 8488 citations revealed that the most frequently used documents were books, which accounted for 54.16 percent of the total citations …

A Scientometric Analysis Of The ‘Journal Of King Saud University-Computer And Information Sciences’, Akhtar Hussain

Library Philosophy and Practice (e-journal)

A scientometric analysis of the Journal of King Saud University-Computer and Information Sciences (JKSU-CIS) 2004-2015 has been conducted. The study explains on the various aspects of the Journal, such as its distribution of article by year, authorship patterns, authors’ degree of collaboration, authorship productivity pattern, distribution of citations by bibliographical forms, subject distributions, citation patterns, rank of cited authors, and geographical distributions of authors. This paper also highlighted institution by distributions and application of Bradford’s law of scattering. The results of this study provide a better understanding of patterns, trends and other important factors as a basis for directing research …

Dynamical Conditions Of Ice Supersaturation And Ice Nucleation In Convective Systems: A Comparative Analysis Between In Situ Aircraft Observations And Wrf Simulations, John D'Alessandro, Minghui Diao, Chenglai Wu, Xiaohong Liu, Ming Chen, Hugh Morrison, Trude Eidhammer, Jorgen Jensen, Aaron Bansemer, Mark Zondlo, Joshua Digangi

Faculty Publications, Meteorology and Climate Science

Occurrence frequency and dynamical conditions of ice supersaturation (ISS, where relative humidity with respect to ice (RHi) > 100%) are examined in the upper troposphere around convective activity. Comparisons are conducted between in situ airborne observations and the Weather Research and Forecasting model simulations using four double‐moment microphysical schemes at temperatures ≤ −40°C. All four schemes capture both clear‐sky and in‐cloud ISS conditions. However, the clear‐sky (in‐cloud) ISS conditions are completely (significantly) limited to the RHi thresholds of the Cooper parameterization. In all of the simulations, ISS occurrence frequencies are higher by ~3–4 orders of magnitude at higher updraft speeds ( …

Performance Measures To Assess Resiliency And Efficiency Of Transit Systems, Hani Nassif, Kaan Özbay, Devajyoti Deka, Peng Lou, Chaekuk Na, Sandeep Mudigonda, Yuan Zhu, Ender Faruk Morgul, Bekir Bartin, Ayman El-Awar

Mineta Transportation Institute

Transit agencies are interested in assessing the short-, mid-, and long-term performance of infrastructure with the objective of enhancing resiliency and efficiency. This report addresses three distinct aspects of New Jersey’s Transit System: 1) resiliency of bridge infrastructure, 2) resiliency of public transit systems, and 3) efficiency of transit systems with an emphasis on paratransit service.

This project proposed a conceptual framework to assess the performance and resiliency for bridge structures in a transit network before and after disasters utilizing structural health monitoring (SHM), finite element (FE) modeling and remote sensing using Interferometric Synthetic Aperture Radar (InSAR). The public transit …

Information Seeking Behaviour Of Visually Challenge Students In Public Universities: A Study Of University Of Ghana, Legon And University Of Education, Winneba., Deborah K. Appiah Ms

Library Philosophy and Practice (e-journal)

The paper is on information seeking behaviour of the visually challenged students of University of Ghana, Legon and University of Education, Winneba. It investigates whether the services provided by these universities accommodated the information seeking behaviour of visually challenged students or not. The theoretical framework for the study was Wilson’s (1999) Information Behaviour Model. The survey method was used to collect data from visually challenged students in both universities. The major findings of the study were that only one of the universities surveyed provides special services for visually challenged students. There were no specific policies from both universities Resource Centre …

Assessment Of An Atmospheric Transport Model For Annual Inverse Estimates Of California Greenhouse Gas Emissions, Justin Bagley, Seongeun Jeong, Xinguang Cui, Sally Newman, Jingsong Zhang, Chad Priest, Mixtli Campos-Pineda, Arlyn Andrews, Laura Bianco, Matthew Lloyd, Neil Lareau, Craig Clements, Marc Fischer

Faculty Publications, Meteorology and Climate Science

Atmospheric inverse estimates of gas emissions depend on transport model predictions, hence driving a need to assess uncertainties in the transport model. In this study we assess the uncertainty in WRF-STILT (Weather Research and Forecasting and Stochastic Time-Inverted Lagrangian Transport) model predictions using a combination of meteorological and carbon monoxide (CO) measurements. WRF configurations were selected to minimize meteorological biases using meteorological measurements of winds and boundary layer depths from surface stations and radar wind profiler sites across California. We compare model predictions with CO measurements from four tower sites in California from June 2013 through May 2014 to assess …

Brownian Motion Of Solitons In A Bose-Einstein Condensate, Lauren M. Aycock, Hilary M. Hurst, Dimitry K. Efimkin, Dina Genkina, Hsin-I Lu, Victor M. Galitski, I. B. Spielman

Faculty Research, Scholarly, and Creative Activity

We observed and controlled the Brownian motion of solitons. We launched solitonic excitations in highly elongated ⁸⁷ Rb Bose-Einstein condensates (BECs) and showed that a dilute background of impurity atoms in a different internal state dramatically affects the soliton. With no impurities and in one-dimension (1D), these solitons would have an infinite lifetime, a consequence of integrability. In our experiment, the added impurities scatter off the much larger soliton, contributing to its Brownian motion and decreasing its lifetime. We describe the soliton's diffusive behavior using a quasi-1D scattering theory of impurity atoms interacting with a soliton, giving diffusion coefficients consistent …

Perception Of Students On Mobile Technology Based Library Services, Theophilus Kwamena Ocran

Library Philosophy and Practice (e-journal)

Introduction: Emerging trends in library and information space especially in the academic environment requires remote and boundary less access to library services. Mobile technology has been recognised as the single most embraced technology in the world. Implementing this technological innovation will bring a lot of relief to students in University of Cape Coast and the University community in general.

The study attempts to investigate the perception of students of University of Cape Coast on mobile technology-based library service. The pilot study involved six management members from the library and fifteen students comprising ten undergraduate and five postgraduate students.

Intelligent Web Crawler For Semantic Search Engine, Shujia Zhang

Master's Projects

A Semantic Search Engine (SSE) is a program that produces semantic-oriented concepts from the Internet. A web crawler is the front end of our SSE; its primary goal is to supply important and necessary information to the data analysis component of SSE. The main function of the analysis component is to produce the concepts (moderately frequent finite sequences of keywords) from the input; it uses some variants of TF-IDF as a primary tool to remove stop words. However, it is a very expensive way to filter out stop words using the idea of TF-IDF. The goal of this project is …

The Sluggs Survey: Stellar Masses And Effective Radii Of Early-Type Galaxies From Spitzer Space Telescope 3.6 Μm Imaging, Duncan Forbes, Luciana Sinpetru, Giulia Savorgnan, Aaron Romanowsky, Christopher Usher, Jean Brodie

Faculty Publications

Galaxy starlight at 3.6 μm is an excellent tracer of stellar mass. Here we use the latest 3.6 μm imaging from the Spitzer Space Telescope to measure the total stellar mass and effective radii in a homogeneous way for a sample of galaxies from the SAGES Legacy Unifying Globulars and GalaxieS (SLUGGS) survey. These galaxies are representative of nearby early-type galaxies in the stellar mass range of 10 < log M*/M⊙ < 11.7 and our methodology can be applied to other samples of early-type galaxies. We model each galaxy in 2D and estimate its total asymptotic magnitude from a 1D curve-of-growth. Magnitudes are converted into stellar masses using a 3.6 μm mass-to-light ratio from the latest stellar population models of Röck et al., assuming a Kroupa initial mass function. We apply a ratio based on each galaxy's mean mass-weighted stellar age within one effective radius (the mass-to-light ratio is insensitive to galaxy metallicity for the generally old stellar ages and high metallicities found in massive early-type galaxies). Our 3.6 μm stellar masses agree well with masses derived from 2.2 μm data. From the 1D surface brightness profile, we fit a single Sérsic law, excluding the very central regions. We measure the effective radius, Sérsic n parameter and effective surface brightness for each galaxy. We find that galaxy sizes derived from shallow optical imaging and the 2MASS survey tend to underestimate the true size of the largest, most massive galaxies in our sample. We adopt the 3.6 μm stellar masses and effective radii for the SLUGGS survey galaxies.

Editor's Words, Bo Mou

Comparative Philosophy

No abstract provided.

Vol 8 No 1 Contents Page

Comparative Philosophy

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Vol 8 No 1 Information Page

Comparative Philosophy

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Vol 8 No 1 Cover Page

Comparative Philosophy

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Perceived Effects Of Use Of Information And Communication Technologies (Icts) On Rural Farmers’ Knowledge In Orlu Agricultural Zone, Imo State., Tijjani Abu Rimi Mr, Anaeto Francis Chudi Dr, Emerhirhi Emily Emily Mrs

Library Philosophy and Practice (e-journal)

The aim of this study was to ascertain the effects of use of Information and Communication Technologies (ICTs) on farmers’ knowledge in Orlu Agricultural Zone, Imo State. Data were collected with structured questionnaires distributed to 130 respondents randomly selected from the 10 extension blocks in Orlu Agricultural Zone. Data collected were analyzed descriptively. The result obtained showed that, radio is the most readily available ICT device (99.2%), followed by mobile phone (97.7%). It was also observed that ICT use have effects on the farmers’ knowledge on improve use of equipment with a mean response of 2.93, increase knowledge of use …

Malware Detection Using The Index Of Coincidence, Bhavna Gurnani

Master's Projects

In this research, we apply the Index of Coincidence (IC) to problems in malware analysis. The IC, which is often used in cryptanalysis of classic ciphers, is a technique for measuring the repeat rate in a string of symbols. A score based on the IC is applied to a variety of challenging malware families. We nd that this relatively simple IC score performs surprisingly well, with superior results in comparison to various machine learning based scores, at least in some cases.

Role Of Emotions In Seeking And Sharing Of Information In Library Of Babasaheb Bhimrao Ambedkar University, Lucknow, India, Shilpi Verma, Divyanshu Gupta

Library Philosophy and Practice (e-journal)

Emotions play a significant role in the workplace and staff/authorities’ emotions. Emotional factors are equally important because they affect the general tone of discussion and influence the ways in which participants seek and share information.

The main aim of the present study is to elaborate the picture of the role of emotional expressions in information seeking and sharing. The main emphasis will be placed on ways in which positive and negative emotions are expressed in the context of information seeking and sharing.The data of users of Central University Babasaheb Bhimrao Ambedkar University was collected and analysed keeping in view the …

Estimating Methane Emissions From Biological And Fossil-Fuel Sources In The San Francisco Bay Area, Seongeun Jeong, Xinguang Cui, Donald Blake, Ben Miller, Stephen Montzka, Arlyn Andrews, Abhinav Guha, Philip Martien, Ray Bambha, Brian Lafranchi, Hope Michelsen, Craig Clements, Pierre Glaize, Marc Fischer

Faculty Publications, Meteorology and Climate Science

We present the first sector-specific analysis of methane (CH4) emissions from the San Francisco Bay Area (SFBA) using CH4 and volatile organic compound (VOC) measurements from six sites during September – December 2015. We apply a hierarchical Bayesian inversion to separate the biological from fossil-fuel (natural gas and petroleum) sources using the measurements of CH4 and selected VOCs, a source-specific 1 km CH4 emission model, and an atmospheric transport model. We estimate that SFBA CH4 emissions are 166–289 Gg CH4/yr (at 95% confidence), 1.3–2.3 times higher than a recent inventory with much of the underestimation from landfill. Including the VOCs, …

Extending Flood Forecasting Lead Time In A Large Watershed By Coupling Wrf Qpf With A Distributed Hydrological Model, Ji Li, Yangbo Chen, Huanyu Wang, Jianming Qin, Jie Li, Sen Chiao

Faculty Publications, Meteorology and Climate Science

Long lead time flood forecasting is very important for large watershed flood mitigation as it provides more time for flood warning and emergency responses. The latest numerical weather forecast model could provide 1–15-day quantitative precipitation forecasting products in grid format, and by coupling this product with a distributed hydrological model could produce long lead time watershed flood forecasting products. This paper studied the feasibility of coupling the Liuxihe model with the Weather Research and Forecasting quantitative precipitation forecast (WRF QPF) for large watershed flood forecasting in southern China. The QPF of WRF products has three lead times, including 24, 48 …

Designing A Course For Peer Educators In Undergraduate Engineering Design Courses, Gina Quan, Chandra Turpen, Ayush Gupta, Emilia Tanu

Faculty Publications

Learning Assistants (LAs) are undergraduate peer educators who participate in weekly pedagogyseminars and work alongside faculty instructors in active-learning based undergraduate courses.While LA programs were initially developed for science and math courses, many LA programssupport LAs in a wide range of disciplines. This paper describes a pilot adaptation of the LAprogram for engineering design courses that we have developed at the University of Maryland,College Park Campus. All LAs assist in 14 separate sections of University of Maryland’sengineering design course for first-year undergraduate students. Our seminar integrates topicsfrom the discipline-general LA pedagogy seminar (cognitive science of learning, facilitation ofclassroom discourse, collaboration, …

Sjsu Erfa News, Winter 2017, San Jose State University, Emeritus And Retired Faculty Association

Emeritus and Retired Faculty Association (ERFA) Newsletter

Volume 31, Number 2

Design Prototyping Methods: State Of The Art In Strategies, Techniques, And Guidelines, Bradley Camburn, Vimal Viswanathan, Julie Linsey, David Anderson, Daniel Jensen, Richard Crawford, Kevin Otto, Kristin Wood

Faculty Publications, Mechanical Engineering

Prototyping is interwoven with nearly all product, service, and systems development efforts. A prototype is a pre-production representation of some aspect of a concept or final design. Prototyping often predetermines a large portion of resource deployment in development and influences design project success. This review surveys literature sources in engineering, management, design science, and architecture. The study is focused around design prototyping for early stage design. Insights are synthesized from critical review of the literature: key objectives of prototyping, critical review of major techniques, relationships between techniques, and a strategy matrix to connect objectives to techniques. The review is supported …

Impact Of Reviewer Social Interaction On Online Consumer Review Fraud Detection, Kunal Goswami, Younghee Park, Chungsik Song

Faculty Publications

Background Online consumer reviews have become a baseline for new consumers to try out a business or a new product. The reviews provide a quick look into the application and experience of the business/product and market it to new customers. However, some businesses or reviewers use these reviews to spread fake information about the business/product. The fake information can be used to promote a relatively average product/business or can be used to malign their competition. This activity is known as reviewer fraud or opinion spam. The paper proposes a feature set, capturing the user social interaction behavior to identify fraud. …

Optimal Trajectory Determination And Mission Design For Asteroid/Deep-Space Exploration Via Multibody Gravity Assist Maneuvers, Sean Fritz, Kamran Turkoglu

Faculty Publications

This paper discusses the creation of a genetic algorithm to locate and optimize interplanetary trajectories using gravity assist maneuvers to improve fuel efficiency of the mission. The algorithm is implemented on two cases: (i) a Centaur-class target close to the ecliptic plane and (ii) a Centaur-class target with a high inclination to the ecliptic plane. Cases for multiple numbers of flybys (up to three) are discussed and compared. It is shown that, for the targets considered here, a single flyby of Jupiter is the most efficient trajectory to either target with the conditions and limitations discussed in this paper. In …

The Intersections Of Africana Studies And Curriculum Theory: An Exploration, Theodorea Regina Berry

Faculty Publications

There has been much critique of globalization now circulating in curriculum studies both nationally, in the United States, and internationally, helps us understand some of the lethal effects of globalization. Nevertheless, little of such critique is grounded in a strong commitment to work beyond the Western epistemological perimeter. While we, as reconceptualists in curriculum studies, acknowledge the necessity to honor the multiple sources and perspectives of knowledge, we continue to operate in spaces and with intentions embedded in globalized, traditional notions of curriculum. This problem is especially heightened for socially marginalized learners, particularly Black/African American learners.

In this article, I …