cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Contextualized Web-Based Learning Environments for DEVS Models
Creators: name: Srivrunyoo, Inthira
Publisher: name: Georgia State University
Year: 2007

description: With the advance in applying technology in education, the traditional lecture-driven teaching style is gradually replaced by a more active teaching style where the students play a more active rule in the learning process. In this paper we introduce a new initiative to provide a suite of online tools for learning DEVS model.  The uniqueness of this tutorial project is the integration of information technology and multimedia into education through the development of an interactive tutorial and the characteristic of contextualized learning. The tutorial teaches students about the basic aspects of discrete event system and simulation. The interactive tutorial fully utilizes the power of the information and multimedia technology, web application and the programming language Java, to enhance students? learning to achieve rich interactivity. The tutorial greatly supports human-computer collaboration to enhance learning and to satisfy user goals by effectively allowing the user to interact.
Peer-to-Peer Distributed SyD Directory Synchronization in a Proximity-based Environment
Creators: name: Dasari, Sunetri
Publisher: name: Georgia State University
Year: 2007

description: Distributed directory services are an evolving paradigm in the distributed computing arena. They are a shift from the centralized directory that causes delay and does not scale well to widespread peer-to-peer networks. With networking becoming more pervasive, there is a need to integrate the heterogeneity of device, data and network with the applications that are built on them. SyD or System on Mobile Devices is a middleware that is being used to implement such a distributed directory service. To provide a persistent global view of data, we serialize and synchronize the distributed directories. The SyD APIs provide a high-level environment to rapidly develop collaborative applications for such networks in a systematic manner. An intervehicle communication application that notifies the driver of a vehicle of the available parking spots in the vicinity, allows us to see the practical working and benefits of the distributed directory paradigm.
What You See Is What You Breathe? Estimating Air Pollution Spatial Variation Using Street-Level Imagery
Creators: name: Suel, Esra
name: Sorek-Hamer, Meytar
name: Moise, Izabela
name: Von Pohle, Michael
name: Sahasrabhojanee, Adwait
name: Asanjan, Ata Akbari
name: Arku, Raphael E.
name: Alli, Abosede S.
name: Barratt, Benjamin
name: Clark, Sierra N.
name: Middel, Ariane
name: Deardorff, Emily
name: Lingenfelter, Violet
name: Oza, Nikunj C.
name: Yadav, Nishant
name: Ezzati, Majid
name: Brauer, Michael (Of University Of British Columbia)
Publisher: name: Multidisciplinary Digital Publishing Institute
Year: 2023

description: High spatial resolution information on urban air pollution levels is unavailable in many areas globally, partially due to the high input data needs of existing estimation approaches. We introduced a computer vision method to estimate annual means for air pollution levels from street-level images. We used annual mean estimates of NO2 and PM2.5 concentrations from locally calibrated models as labels from London, New York, and Vancouver to allow for compilation of a sufficiently large dataset (~250 k images for each city). Our experimental setup is designed to quantify intra- and intercity transferability of image-based model estimates. Performances were high and comparable to traditional land-use regression (LUR) and dispersion models when training and testing images from the same city (R2 values between 0.51 and 0.95 when validated on data from ground monitoring stations). Similar to LUR models, transferability of models between cities in different geographies is more difficult. Specifically, transferability between the three cities (London, New York, and Vancouver), which have similar pollution source profiles, was moderately successful (R2 values between zero and 0.67). Comparatively, performances when transferring models trained on cities with very different source profiles, such as Accra in Ghana and Hong Kong, were lower (R2 between zero and 0.21). This suggests a need for local calibration, using additional measurement data from cities that share similar source profiles.
WS-CDL Based Specification for Web Services Collaboration Testing
Creators: name: Ugaas, Ahmed
Publisher: name: Georgia State University
Year: 2008

description: Service Oriented Computing(SOC) is becoming a major paradigm for developing next generation of software systems, and one of the major challenges of Service Oriented Computing is testing interactions and collaborations among the distributed and dynamically integrated web services. To support automated test of web service?s collaborations, a formal specification is needed. This thesis proposes a specification of web services collaborations based on Web Services Choreography Description Language (WS-CDL). We identify the basic constructs that can be found in any web services collaboration, and we mapped them to the new WS-CDL based language (WS-CDL+). Finally, A scenario of web services collaboration is developed and specification in WS-CDL+ is provided. This work builds a foundation for automated web services testing in a service oriented computing environment.
SenMinCom: Pervasive Distributed Dynamic Sensor Data Mining for Effective Commerce
Creators: name: Hiremath, Naveen
Publisher: name: Georgia State University
Year: 2008

description: In last few years, the use of wireless sensor networks and cell phones has become ubiquitous; fusing these technologies in the field of business will open up new possibilities.  To fill this lacuna, I propose a novel idea where the combination of these will facilitate companies to receive feedback on their products and services. System's unobtrusive sensors will not only collect shopping, mobile usage data from consumers but will also make effective use of this information to increase revenue, cut costs, etc.; the use of mobile agent based data mining allows analyzing the data from different dimensions, categorizing it on factors such as product positioning, promotion of goods, etc. as in the case of a shopping store. Additionally, because of the dynamic mining system the companies get on-the-scene recommendation of products rather than off-the-scene. In this thesis, a novel distributed pervasive mining system is proposed to get dynamic shopping information and mobile device usage of the customers.
P-Percent Coverage in Wireless Sensor Networks
Creators: name: Sambhara, Chaitanya
Publisher: name: Georgia State University
Year: 2008

description: Coverage in a Wireless Sensor Network reflects how well a sensor network monitors an area. Many times it is impossible to provide full coverage. The key challenges are to prolong the lifetime and ensure connectivity to provide a stable network. In this thesis we first define p-percent coverage problem in which we require only p% of the whole area to be monitored. We propose two algorithms, Connected P-Percent Coverage Depth First Search (CpPCA-DFS) and Connected P-Percent Connected Dominating Set (CpPCA-CDS). Through simulations we then compare and analyze them for their efficiency and lifetime. Finally in conclusion we prove that CpPCA-CDS provides 5 to 20 percent better active node ratio at low density. At high node density it achieves better distribution of covered area however the lifetime is only 5 to10 percent shorter then CpPCA-DFS. Overall CpPCA-CDS provides up to 30 percent better distribution of covered area.
In Conversation
Creators: name: Fazakerley, Ruth
name: Golda, Agnieszka
name: Johnson, Martin
Publisher: name: RMIT University
Year: 2024
Subjects: classificationCode: 330102
subject: Architectural design
classificationCode: 360603
subject: Performance art

description: A large-scale collaborative installation of interconnected sculptural objects, textiles and paintings that explore the way migrant and non-migrant bodies negotiate the spaces they both occupy.
802.11 Fingerprinting to Detect Wireless Stealth Attacks
Creators: name: Venkataraman, Aravind
Publisher: name: Georgia State University
Year: 2008

description: We propose a simple, passive and deployable approach for fingerprinting traffic on the wired side as a solution for three critical stealth attacks in wireless networks. We focus on extracting traces of the 802.11 medium access control (MAC) protocol from the temporal arrival patterns of incoming traffic streams as seen on the wired side, to identify attacker behavior. Attacks addressed include unauthorized access points, selfish behavior at the MAC layer and MAC layer covert timing channels. We employ the Bayesian binning technique as a means of classifying between delay distributions. The scheme requires no change to the 802.11 nodes or protocol, exhibits minimal computational overhead and offers a single point of discovery. We evaluate our model using experiments and simulations.
Proxy Module for System on Mobile Devices (SyD) Middleware
Creators: name: Gunawan, Joseph
Publisher: name: Georgia State University
Year: 2008

description: Nowadays, users of mobile devices are growing. The users expect that they could communicate constantly using their mobile devices while they are also constantly moving. Therefore, there is a need to provide disconnection tolerance of transactions in the mobile devices? platforms and its synchronization management. System on Mobile Devices (SyD) is taken as one of the examples of mobile devices? platforms. The thesis studies the existing SyD architecture, from its framework into its kernel, and introduces the proxy module enhancement in SyD to handle disconnection tolerance, including its synchronization. SyD kernel has been extended for the purpose of enabling proxy module. SyDSync has been constructed for synchronization with the proxy. The timeout has been studied for seamless proxy invocation. A Camera application that tries to catch a stolen vehicle has been simulated for the practical purpose of using the proxy module extension.
An Interactive Wildfire Spread and Suppression Simulation Environment Based on Devs-Fire
Creators: name: Song, Fei
Publisher: name: Georgia State University
Year: 2008

description: Wildfires pose serious threats to the society and environment. Simulation of wildfire spread and fire suppression remains a challenging task due to the complexity of wildfire behavior and fire suppression tactics. In previous work, a wildfire spread and suppression simulation model called DEVS-FIRE has been developed. Based on that model, this thesis develops a graphic user interface to support an interactive simulation environment for surface wildfire spread and suppression simulation. The developed environment allows users to dynamically set up fire spread simulations, and to interacticaly deploy firefighting agents to experiment different fire suppression tactics. This graphic user interface is implemented using the Java Swing framework, and is intergrated with the DEVS-FIRE model in a well-designed manner. The software architecture is described and the simulation environment and experiment results with different fuel, terrain and weather data are presented.
An Adaptive Mesh MPI Framework for Iterative C++ Programs
Creators: name: Silva, Karunamuni
Publisher: name: Georgia State University
Year: 2009

description: Computational Science and Engineering (CSE) applications often exhibit the pattern of adaptive mesh applications. Adaptive mesh algorithm starts with a coarse base-level grid structure covering entire computational domain. As the computation intensified, individual grid points are tagged for refinement. Such tagged grid points are dynamically overlayed with finer grid points.
Similarly if the level of refinement in a cell is greater than required, all such regions are replaced with coarser grids. These refinements proceed recursively. We have developed an object-oriented framework enabling time-stepped adaptive mesh application developers to convert their sequential applications to MPI applications in few easy steps. We present in this thesis our
positive experience converting such application using our framework. In addition to the MPI support, framework does the grid expansion/contraction and load balancing making the application developer?s life easier.
A Convert Channel Using 802.11 LANS
Creators: name: Calhoun, Telvis
Publisher: name: Georgia State University
Year: 2009

description: We present a covert side channel that uses the 802.11 MAC rate switching protocol. The covert channel provides a general method to hide communications in an 802.11 LAN. The technique uses a one-time password algorithm to ensure high-entropy randomness of the covert messages. We investigate how the covert side channel affects node throughput in mobile and non-mobile scenarios. We also investigate the covertness of the covert side channel using standardized entropy. The results show that the performance impact is minimal and increases slightly as the covert channel bandwidth increases. We further show that the channel has 100% accuracy with minimal impact on rate switching entropy. Finally, we present two applications for the covert channel: covert authentication and covert WiFi botnets.
The Pivotal Role of Quantum Dots-Based Biomarkers Integrated with Ultra-Sensitive Probes for Multiplex Detection of Human Viral Infections
Creators: name: Mousavi, Seyyed Mojtaba
name: Hashemi, Seyyed Alireza
name: Yari Kalashgrani, Masoomeh
name: Omidifar, Navid
name: Lai, Chin Wei
name: Vijayakameswara Rao, Neralla
name: Gholami, Ahmad
name: Chiang, Wei-Hung
Publisher: name: Multidisciplinary Digital Publishing Institute
Year: 2023

description: The spread of viral diseases has caused global concern in recent years. Detecting viral infections has become challenging in medical research due to their high infectivity and mutation. A rapid and accurate detection method in biomedical and healthcare segments is essential for the effective treatment of pathogenic viruses and early detection of these viruses. Biosensors are used worldwide to detect viral infections associated with the molecular detection of biomarkers. Thus, detecting viruses based on quantum dots biomarkers is inexpensive and has great potential. To detect the ultrasensitive biomarkers of viral infections, QDs appear to be a promising option as biological probes, while physiological components have been used directly to detect multiple biomarkers simultaneously. The simultaneous measurement of numerous clinical parameters of the same sample volume is possible through multiplex detection of human viral infections, which reduces the time and cost required to record any data point. The purpose of this paper is to review recent studies on the effectiveness of the quantum dot as a detection tool for human pandemic viruses. In this review study, different types of quantum dots and their valuable properties in the structure of biomarkers were investigated. Finally, a vision for recent advances in quantum dot-based biomarkers was presented, whereby they can be integrated into super-sensitive probes for the multiplex detection of human viral infections.
Implementing Energy-Saving Improvements to the IEEE 802.15.4 MAC Protocol
Creators: name: Valero, Marco
Publisher: name: Georgia State University
Year: 2009

description: IEEE 802.15.4 is a standard designed for low data rate wireless personal area networks (WPANs) intended to provide connectivity to mobile devices. Such devices present considerable storage, energy, and communication constraints. However, they can be used in a variety of applications like home/office automation, environmental control and more. In order to extend the lifetime of the WPAN, we propose some changes to the standard including modifications to the Superframe Guaranteed Time Slot (GTS) distribution which can be optimized to reduce energy consumption. We implemented the proposed improvements to the IEEE 802.15.4 protocol using real sensor nodes. Specifically, we conducted an energy study of the proposed acknowledgment-based GTS descriptor distribution scheme and compared the results with the standard implementation. Experiments show that the proposed changes reduce energy consumption up to nearly 50% when 7 devices allocate guaranteed time slots descriptors during normal communication.
Supplementary document for Efficient nano-photonic antennas based on dark states in quantum emitter rings - 5518600.pdf
Creators: name: Moreno-Cardoner, Maria
name: Holzinger, Rapahel
name: Ritsch, Helmut
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Simplified model based on an effective dipole to replace the ring
A Browser-Based Collaborative Multimedia Messaging System
Creators: name: Gentner, Susan
Publisher: name: Georgia State University
Year: 2009

description: Making a communication tool easier for people to operate can have profound and positive effects on its popularity and on the users themselves. This thesis is about making it easier for people to publish web-based documents that have sound, video and text. Readily available software and hardware are employed in an attempt to achieve the goal of providing a software service that enables users to compose audio-video documents with text.
Batch Scheduling in Optical Burst Switching Networks
Creators: name: Wang, Yichuan
Publisher: name: Georgia State University
Year: 2009

description: Optical Burst Switching (OBS) is an emerging technology for bearing bursty IP traffic directly over Wavelength Division Multiplexing (WDM) links. In OBS network, a key challenge is to reduce the data loss rate with efficient scheduling algorithms. In this work, we first propose a novel traffic aggregation algorithm, namely Tree-based Burst Aggregation (TBA), which aggregates bursts that are routed within a common tree topology into a composite burst and switch them as a single unit whenever possible. Then we propose another set of algorithms are batch scheduling using interval graphs in the core nodes. The algorithms effectively consider the strong correlations among the multiple bursts, and employ the proposed interval graphs and min-cost circular flow techniques to achieve optimized network performance in terms of data loss rate in OBS networks.
title: Untersuchungen zur Etablierung der DIN EN 16516 als neue Referenznorm für die Prüfung von Formaldehydemissionen aus Holzwerkstoffen gemäß Chemikalien-Verbotsverordnung
title: Investigations to establish DIN EN 16516 as new reference standard for testing of formaldehyde emissions from wood-based panels under the Chemikalien-Verbotsverordnung
titleType: AlternativeTitle
title: Untersuchungen zur Etablierung der DIN EN 16516 als neue Referenznorm für die Prüfung von Formaldehydemissionen aus Holzwerkstoffen gemäß Chemikalien-Verbotsverordnung
titleType: AlternativeTitle
Creators: name: Brozowski, Frank
name: Wilke, Olaf
name: Jann, Oliver
name: Plehn, Wolfgang
Publisher: name: My University
Year: 2019
Subjects: Formaldehyd
Innenraumluft

description: Im Januar 2018 wurde die DIN EN 16516 "Bauprodukte: Bewertung der Freisetzung gefährlicher Stoffe - Bestimmung von Emissionen in die Innenraumluft" als harmonisierte europäische Prüfnorm veröffentlicht. Für die Etablierung der DIN EN 16516 als neue Referenznorm wurden verschiedene Emissionsprüfungen mit dem Ziel durchgeführt, ein neues Prüfverfahren für Formaldehydemissionen aus Holzwerkstoffen zu erarbeiten. Das übergeordnete Ziel ist die Minimierung des Risikos von Überschreitungen des Innenraumrichtwertes für Formaldehyd. Die Untersuchungen ergaben teilweise hohe Formaldehydemissionen, insbesondere bei höheren Beladungsfaktoren und Temperaturen, sowie bei niedrigen Luftwechselraten. Eine getestete Spanplatte hätte aufgrund ihrer hohen Formaldehydemission nicht auf den deutschen Markt gebracht werden dürfen. Durch vergleichende Untersuchungen konnte ein Umrechnungsfaktor in Höhe von 2,0 für die Umrechnung von Prüfwerten nach DIN EN 717-1 zu DIN EN 16516 abgeleitet werden. Quelle: https://opus4.kobv.de
description: DIN EN 16516 "Construction products: Assessment of release of dangerous substances - Determination of emissions into indoor air" was published as a harmonized European standard in January 2018. For the establishment of DIN EN 16516 as the new reference standard various emission tests were carried out with the aim to develop a new test procedure for the measurement of formaldehyde emissions from wood-based panels. The superior aim is to minimize the risk of exceeding the indoor air reference value for formaldehyde. The investigations showed some particularly high formaldehyde emissions, especially at higher loading and temperature and at low air change rates. One of the tested particle boards exceeded the formaldehyde limit value and should not have been sold in Germany. For the conversion of test values from DIN EN 717-1 to DIN EN 16516 a conversion factor of 2.0 was derived from the comparative investigations. Quelle: https://opus4.kobv.de
A GPU Stream Computing Approach to Terrain Database Integrity Monitoring
Creators: name: McKeon, Sean
Publisher: name: Georgia State University
Year: 2009

description: Synthetic Vision Systems (SVS) provide an aircraft pilot with a virtual 3-D image of surrounding terrain which is generated from a digital elevation model stored in an onboard database. SVS improves the pilot's situational awareness at night and in inclement weather,
thus reducing the chance of accidents such as controlled flight into terrain. A terrain database
integrity monitor is needed to verify the accuracy of the displayed image due to potential
database and navigational system errors. Previous research has used existing aircraft sensors
to compare the real terrain position with the predicted position. We propose an improvement
to one of these models by leveraging the stream computing capabilities of commercial
graphics hardware. "Brook for GPUs," a system for implementing stream computing applications
on programmable graphics processors, is used to execute a streaming ray-casting
algorithm that correctly simulates the beam characteristics of a radar altimeter during all
phases of flight.
STCP: A New Transport Protocol for High-Speed Networks
Creators: name: Shivarudraiah, Ranjitha
Publisher: name: Georgia State University
Year: 2009

description: Transmission Control Protocol (TCP) is the dominant transport protocol today and likely to be adopted in future high?speed and optical networks. A number of literature works have been done to modify or tune the Additive Increase Multiplicative Decrease (AIMD) principle in TCP to enhance the network performance. In this work, to efficiently take advantage of the available high bandwidth from the high?speed and optical infrastructures, we propose a Stratified TCP (STCP) employing parallel virtual transmission layers in high?speed networks. In this technique, the AIMD principle of TCP is modified to make more aggressive and efficient probing of the available link bandwidth, which in turn increases the performance. Simulation results show that STCP offers a considerable improvement in performance when compared with other TCP variants such as the conventional TCP protocol and Layered TCP (LTCP).
A Novel Stable Model Computation Approach for General Dedcutive Databases
Creators: name: Khabya, Komal
Publisher: name: Georgia State University
Year: 2010

description: The aim of this thesis is to develop faster method for stable model computation of non-stratified logic programs and study its efficiency. It focuses mainly on the stable model and weak well founded semantics of logic programs. We propose an approach to compute stable models by where we first transform the logic program using paraconsistent relational model, then we compute the weak-well founded model which is used to generate a set of models consisting of the true and unknown values, which are tested for stability. We perform some experiments to test the efficiency of our approach which incurs overhead to eliminate negative values against a Na?ve method of stable model computation.
Data Aggregation through Web Service Composition in Smart Camera Networks
Creators: name: Rajapaksage, Jayampathi
Publisher: name: Georgia State University
Year: 2010

description: Distributed Smart Camera (DSC) networks are power constrained real-time distributed embedded systems that perform computer vision using multiple cameras. Providing data aggregation techniques that is criti-cal for running complex image processing algorithms on DSCs is a challenging task due to complexity of video and image data. Providing highly desirable SQL APIs for sophisticated query processing in DSC networks is also challenging for similar reasons. Research on DSCs to date have not addressed the above two problems. In this thesis, we develop a novel SOA based middleware framework on a DSC network that uses Distributed OSGi to expose DSC network services as web services. We also develop a novel web service composition scheme that aid in data aggregation and a SQL query interface for DSC net-works that allow sophisticated query processing. We validate our service orchestration concept for data aggregation by providing query primitive for face detection in smart camera network.
Covert DCF - A DCF-Based Covert Timing Channel In 802.11 Networks
Creators: name: Holloway, Russell
Publisher: name: Georgia State University
Year: 2010

description: Covert channels are becoming more popular as security risks grow in networks.  One area that is promising for covert channels is wireless networks, since many use a collision avoidance scheme such as carrier sense multiple access with collision avoidance (CSMA/CA).  These schemes often introduce randomness in the network, which provides good cover for a covert timing channel.  In this thesis, we use the 802.11 standard as an example to demonstrate a wireless covert channel.  In particular, most 802.11 configurations use a distributed coordinated function (DCF) to assist in communications.  This DCF uses a random backoff to avoid collisions, which provides the cover for our covert channel.  Our timing channel provides great improvements on other recent covert channels in the field of throughput, while maintaining high accuracy.  We are able to achieve throughput over 8000 bps using Covert DCF, or by accepting a throughput of 1800 bps we can achieve higher covertness and 99% accuracy as well.
Assessing the Physical Vulnerability of Backbone Networks
Creators: name: Shivarudraiah, Vijetha
Publisher: name: Georgia State University
Year: 2011

description: Communication networks are vulnerable to natural as well as man-made disasters. The geographical layout of the network influences the impact of these disasters. It is therefore, necessary to identify areas that could be most affected by a disaster and redesign those parts of the network so that the impact of a disaster has least effect on them. In this work, we assume that disasters which have a circular impact on the network. The work presents two new algorithms, namely the WHF-PG algorithm and the WHF-NPG algorithm, designed to solve the problem of finding the locations of disasters that would have the maximum disruptive effect on the communication infrastructure in terms of capacity.
Open Science in Horizon Europe - Hasselt University
Creators: name: Daniels, Nicky
name: Vlietinck, Hanne
name: Kenens, Ulrike
name: Berckmans, Jolien
Publisher: name: OSF
Year: 2022
Subjects: Funding
Horizon Europe
OS
Open Science
RDM
Research Data Management

description: Poster presented at the UHasselt Research Day 2024 focussed on Internationalisation.
Attacking and Securing Beacon-Enabled 802.15.4 Networks
Creators: name: Jung, Sang Shin
Publisher: name: Georgia State University
Year: 2011

description: The IEEE 802.15.4 has attracted time-critical applications in wireless sensor networks (WSNs) because of its beacon-enabled mode and guaranteed timeslots (GTSs). However, the GTS scheme?s security still leave the 802.15.4 MAC vulnerable to attacks. Further, the existing techniques in the literature for securing 802.15.4 either focus on non beacon-enabled 802.15.4 or cannot defend against insider attacks for beacon-enabled 802.15.4. In this thesis, we illustrate this by demonstrating attacks on the availability and integrity of the beacon-enabled 802.15.4. To proof the attacks, we implement the attacks using Tmote Sky motes for a malicious node along with regular nodes. We show that the malicious node can freely exploit the beacon frames to compromise the integrity and availability of the network. For the defense, we present beacon-enabled MiniSec (BCN-MiniSec) and analyze its cost.
Observational evidence for variations of the acoustic cutoff frequency with height in the solar atmosphere
Creators: name: Wisniewska, Aneta
Publisher: name: SMN - The ScienceMedia Network
Year: 2016
Subjects: Natural Sciences
Astronomy

description: Direct evidence for the existence of an acoustic cutoff frequency in the solar atmosphere is given by observations performed by using the HELioseismological Large Regions Interferometric DEvice operating on the Vacuum Tower Telescope located on Tenerife. The observational results demonstrate variations of the cutoff with atmospheric heights. The observed variations of the cutoff are compared to theoretical predictions made by using five acoustic cutoff frequencies that have been commonly used in helioseismology and asteroseismology. The comparison shows that none of the theoretical predictions is fully consistent with the observational data. The implication of this finding is far reaching as it urgently requires either major revisions of the existing methods of finding acoustic cutoff frequencies or developing new methods that would much betteraccountfor the physical picture underlying the concept of cutoff frequencies in inhomogeneous media.
PREVALENCE OF OVINE AND CAPRINE SCHISTOSOMIASIS AND ITS ASSOCIATED RISK FACTORS IN MECHA DISTRICT NORTHWESTERN ETHIOPIA
Creators: name: ASSFAW FENTANEW
Publisher: name: Zenodo
Year: 2015

description: PREVALENCE OF OVINE AND CAPRINE SCHISTOSOMIASIS AND ITS ASSOCIATED

RISK FACTORS IN MECHA DISTRICT NORTHWESTERN ETHIOPIA
Efficient GTS Allocation Schemes for IEEE 802.15.4
Creators: name: Haque, Syed
Publisher: name: Georgia State University
Year: 2012

description: IEEE 802.15.4 is a standard defined for wireless sensor network applications with limited power and relaxed throughput needs. The devices transmit data during two periods: Contention Access Period (CAP) by accessing the channel using CSMA/CA and Contention Free Period (CFP), which consists of Guaranteed Time Slots (GTS) allocated to individual devices by the network coordinator. The GTS is used by devices for cyclic data transmission and the coordinator can allocate GTS to a maximum of only seven devices. In this work, we have proposed two algorithms for an efficient GTS allocation. The first algorithm is focused on improving the bandwidth utilization of devices, while the second algorithm uses traffic arrival information of devices to allow sharing of GTS slots between more than seven devices. The proposed schemes were tested through simulations and the results show that the new GTS allocation schemes perform better than the original IEEE 802.15.4 standard.
Parallel Discrete Event Simulation on Many Core Platforms Using Parallel Heap Event Queues
Creators: name: Tanniru, Govardhan
Publisher: name: Georgia State University
Year: 2014

description: Discrete Event Simulation on GPUs employing parallel heap data structure is the focus of this thesis. Two traditional algorithms, one being conservative and other being optimistic, for parallel discrete event simulation have been implemented on GPUs using CUDA. The first algorithm is the safe-window algorithm (conservative). It has produced expected performance when compared to sequential simulation. The second algorithm, known as SyncSim, is an optimistic simulation algorithm previously designed to be space efficient and reduce rollbacks. This algorithm is re-implemented on GPU platform with necessary changes on the logic simulator and the parallel heap implementation. The performance of the parallel heap when working with a logic simulator has also been validated against the results indicated in previous research paper on parallel heap without the logic simulator.
Stability analysis and control technology of gob-side entry retaining with double roadways by filling with high-water material in gently inclined coal seam
Creators: name: Xie, Shengrong
name: Wang, En
name: Chen, Dongdong
name: Li, Hui
name: Jiang, Zaisheng
name: Yang, Hongzeng
Publisher: name: The University of British Columbia
Year: 2022

description: To ameliorate the defects of insufficient support resistance of traditional roadside filling bodies for gob-side entry retaining (GER), overcome the inability to adapt to the deformation of surrounding rock, and isolate the goaf effectively, a new type of high-water material as a roadside filling body for GER technology with double roadways was proposed. The instability analysis and control technology of GER with double roadways by filling high-water material into a gently inclined coal seam were studied. The basic mechanical properties of the new high-water material were investigated through laboratory experiments, and their main advantages were identified. The reasonable width of the roadside filling wall of a high-water material was obtained by combining ground pressure observation and theoretical calculations. The distribution characteristics of the stress and plastic zone of surrounding rock of GER after being stabilized by the disturbance of the working face were studied using numerical simulations, and the failure range of GER by filling with high-water material was revealed. Based on this, a coupling control technology of anchor cables and bolts + single props + metal mesh + anchor bolts is proposed. Through the coupling methods of arranging borehole peeping and observing the convergences of surrounding rock, the results demonstrate that GER with double roadways by filling with a 1.8-m-wide high-water material has a good control effect. The above research will play an active role in promoting the application of high-water materials in GER roadside filling.
Towards an MPI-like Framework for Azure Cloud Platform
Creators: name: Karamati, Sara
Publisher: name: Georgia State University
Year: 2014

description: Message passing interface (MPI) has been widely used for implementing parallel and distributed applications. The emergence of cloud computing offers a scalable, fault-tolerant, on-demand al-ternative to traditional on-premise clusters. In this thesis, we investigate the possibility of adopt-ing the cloud platform as an alternative to conventional MPI-based solutions. We show that cloud platform can exhibit competitive performance and benefit the users of this platform with its fault-tolerant architecture and on-demand access for a robust solution. Extensive research is done to identify the difficulties of designing and implementing an MPI-like framework for Azure cloud platform. We present the details of the key components required for implementing such a framework along with our experimental results for benchmarking multiple basic operations of MPI standard implemented in the cloud and its practical application in solving well-known large-scale algorithmic problems.
Trojans in Wireless Sensor Networks
Creators: name: Jalalitabar, Maryamsadat
Publisher: name: Georgia State University
Year: 2014

description: As the demand for cheaper electronic devices has increased, the location of manufacturing foundries has changed to untrusted places outside of the United States. Some of these locations have limited oversight of the manufacturing of complicated and sensitive electronic components including integrated circuits (IC). IC, a key component in all current electronic devices, can be modified to be malicious or to monitor the functions of their applications. These malicious modifications are called Hardware Trojans. Hardware Trojans can be de- signed to quietly monitor, to actively send out unencrypted sensitive information, or to actively destroy their host device. Our research demonstrates the ability of Hardware Trojans to infiltrate a sensor network that could be remotely deployed for various applications. This research is important due to the dearth of knowledge on the subject. Currently, software security is given great importance. Our research shows that the same level of importance must be given to hardware to ensure a trusted and secure environment.
Real-Time Social Network Data Mining For Predicting The Path For A Disaster
Creators: name: Jain, Saloni
Publisher: name: Georgia State University
Year: 2015

description: Traditional communication channels like news channels are not able to provide spontaneous information about disasters unlike social networks namely, Twitter. The present research work proposes a framework by mining real-time disaster data from Twitter to predict the path a disaster like a tornado will take. The users of Twitter act as the sensors which provide useful information about the disaster by posting first-hand experience, warnings or location of a disaster. The steps involved in the framework are ? data collection, data preprocessing, geo-locating the tweets, data filtering and extrapolation of the disaster curve for prediction of susceptible locations. The framework is validated by analyzing the past events. This framework has the potential to be developed into a full-fledged system to predict and warn people about disasters. The warnings can be sent to news channels or broadcasted for pro-active action.
FPGA Based Binary Heap Implementation: With an Application to Web Based Anomaly Prioritization
Creators: name: Alam, Md Monjur
Publisher: name: Georgia State University
Year: 2015

description: This thesis is devoted to the investigation of prioritization mechanism for web based anomaly detection. We propose a hardware realization of parallel binary heap as an application of web based anomaly prioritization. The heap is implemented in pipelined fashion in FPGA platform. The propose design takes O(1) time for all operations by ensuring minimum waiting time between two consecutive operations. We present the various design issues and hardware complexity. We explicitly analyze the design trade-offs of the proposed priority queue implementations.
INDIGO: An In-Situ Distributed Gossip System Design and Evaluation
Creators: name: Ramanan, Paritosh
Publisher: name: Georgia State University
Year: 2015

description: Distributed Gossip in networks is a well studied and observed problem which can be accomplished using different gossiping styles. This work focusses on the development, analysis and evaluation of a novel in-situ distributed gossip protocol framework design called (INDIGO). A core aspect of INDIGO is its ability to execute on a simulation setup as well as a system testbed setup in a seamless manner allowing easy portability. The evaluations focus on application of INDIGO to solve problems such as distributed average consensus, distributed seismic event location and lastly distributed seismic tomography. The results obtained herein validate the efficacy and reliability of INDIGO.
Optimizing Sparse Matrix-Matrix Multiplication on a Heterogeneous CPU-GPU Platform
Creators: name: Wu, Xiaolong
Publisher: name: Georgia State University
Year: 2015

description: Sparse Matrix-Matrix multiplication (SpMM) is a fundamental operation over irregular data, which is widely used in graph algorithms, such as finding minimum spanning trees and shortest paths. In this work, we present a hybrid CPU and GPU-based parallel SpMM algorithm to improve the performance of SpMM. First, we improve data locality by element-wise multiplication. Second, we utilize the ordered property of row indices for partial sorting instead of full sorting of all triples according to row and column indices. Finally, through a hybrid CPU-GPU approach using two level pipelining technique, our algorithm is able to better exploit a heterogeneous system. Compared with the state-of-the-art SpMM methods in cuSPARSE and CUSP libraries, our approach achieves an average of 1.6x and 2.9x speedup separately on the nine representative matrices from University of Florida sparse matrix collection.
Identifying Mavens in Social Networks
Creators: name: Albinali, Hussah
Publisher: name: Georgia State University
Year: 2016

description: This thesis studies social influence from the perspective of users' characteristics. The importance of users' characteristics in word-of-mouth applications has been emphasized in economics and marketing fields. We model a category of users called mavens where their unique characteristics nominate them to be the preferable seeds in viral marketing applications. In addition, we develop some methods to learn their characteristics based on a real dataset. We also illustrate the ways to maximize information flow through mavens in social networks. Our experiments show that our model can successfully detect mavens as well as fulfill significant roles in maximizing the information flow in a social network where mavens considerably outperform general influential users for influence maximization. The results verify the compatibility of our model with real marketing applications.
Autonomous UAV Path Planning for Wildfire Data Collection
Creators: name: Bent, John
Publisher: name: Georgia State University
Year: 2017

description: Teams of unmanned aerial vehicles (UAVs) can be employed in the real-time collection of data for dynamic data-driven simulations of wildfires to provide more accurate simulation predictions. The goal of this thesis was to identify and simulate path planning algorithms and inter-UAV negotiation protocols that best govern and divide responsibility among a team of autonomous UAVs continuously observing the perimeter of a wildfire containing sections of varying importance ? ranging from low-value to high-value target areas. Several benchmark algorithms were implemented as well to measure the effectiveness of the new algorithms. The performance of each algorithm was measured by simulating a team with varying number of UAVs moving around the perimeter of multiple wildfires under differing conditions. The newly developed path planning and negotiation algorithms were found to increase the effectiveness of the team over the case of the benchmark algorithms. The increase in efficiency can be attributed to the UAVs? more selective choice of destination and the equal division of responsibility between UAVs.
Constraints on Higgs boson properties using $$WW^{*}(\rightarrow e\nu \mu \nu )jj$$ W W ∗ ( → e ν μ ν ) j j production in $$36.1\,\mathrm{fb}^{-1}$$ 36.1 fb - 1 of $$\sqrt{s}=13$$ s = 13 TeV pp collisions with the ATLAS detector
Creators: name: ATLAS Collaboration
Publisher: name: Springer Berlin Heidelberg
Year: 2023

description: This article presents the results of two studies of Higgs boson properties using the $$WW^*(\rightarrow e\nu \mu \nu )jj$$ W W ∗ ( → e ν μ ν ) j j final state, based on a dataset corresponding to $${36.1}{{\mathrm{fb}}^{-1}}$$ 36.1 fb - 1 of $$\sqrt{s}=13$$ s = 13  TeV proton–proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study targets Higgs boson production via gluon–gluon fusion and constrains the CP properties of the effective Higgs–gluon interaction. Using angular distributions and the overall rate, a value of $$\tan (\alpha ) = 0.0 \pm 0.4 (\mathrm {stat.}) \pm 0.3 (\mathrm {syst.})$$ tan ( α ) = 0.0 ± 0.4 ( stat . ) ± 0.3 ( syst . ) is obtained for the tangent of the mixing angle for CP-even and CP-odd contributions. The second study exploits the vector-boson fusion production mechanism to probe the Higgs boson couplings to longitudinally and transversely polarised W and Z bosons in both the production and the decay of the Higgs boson; these couplings have not been directly constrained previously. The polarisation-dependent coupling-strength scale factors are defined as the ratios of the measured polarisation-dependent coupling strengths to those predicted by the Standard Model, and are determined using rate and kinematic information to be $$a_\mathrm {L}=0.91^{+0.10}_{-0.18}$$ a L = 0 . 91 - 0.18 + 0.10 (stat.) $$^{+0.09}_{-0.17}$$ - 0.17 + 0.09 (syst.) and $$a_{\mathrm {T}}=1.2 \pm 0.4 $$ a T = 1.2 ± 0.4 (stat.) $$ ^{+0.2}_{-0.3} $$ - 0.3 + 0.2 (syst.). These coupling strengths are translated into pseudo-observables, resulting in $$\kappa _{VV}= 0.91^{+0.10}_{-0.18}$$ κ VV = 0 . 91 - 0.18 + 0.10 (stat.) $$^{+0.09}_{-0.17}$$ - 0.17 + 0.09 (syst.) and $$\epsilon _{VV} =0.13^{+0.28}_{-0.20}$$ ϵ VV = 0 . 13 - 0.20 + 0.28 (stat.) $$^{+0.08}_{-0.10}$$ - 0.10 + 0.08 (syst.). All results are consistent with the Standard Model predictions.
Stock Marketing Prediction Using Narx Algorithm
Creators: name: Alkhoshi, Enas
Publisher: name: Georgia State University
Year: 2018

description: Computational technologies have offered faster and efficient solutions to financial sector. In the financial market, the advancements in computational field have been achieved by the use of neural networks and machine learning that delivered a number of financial tools. Thus, in this thesis, we aim to predict the stock index marketing for the ?Dow Jones? index by using deep learning algorithms. We propose a model based on an adaptive NARX neural network to predict the closing price of a moderately stable market. In our model, non-linear auto regressive exogenous input model inserts delays into the input as well as the output acting as memory slots thereby raising the accuracy of the prediction. Moreover, Levenberg-Marquardt algorithm has been used for training the network. The accuracy of the model is determined by the mean squared error. We also used LR model, with the same parameters as NARX, to improve the overall accuracy.
Impact of urban form and street infrastructure on pedestrian-motorist collisions
Creators: name: Foreman, Taylor
name: Lin, Meimei
name: Tu, Wei
name: Yarbrough, Robert
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Space Science
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology

description: This study examines the impact of urban form and street infrastructure on pedestrian safety in Atlanta, Georgia, and Boston, Massachusetts. With a significant rise in pedestrian fatalities over the past decade, understanding how cities’ built environments influence safety is critical. We conducted geospatial analyses and statistical tests, revealing unique patterns in each city. Atlanta’s sprawling, motorist-oriented layout is associated with increased pedestrian accidents, particularly at crosswalks, due to limited land use diversity, arterial roads, and streets with high speed limits and multiple lanes. In contrast, Boston’s compact, pedestrian-oriented design leads to improved safety, featuring safer pedestrian crossings, greater land use diversity, reduced arterial roads and lower speed limits on single-lane streets. This study also highlights the importance of diverse urban forms and pedestrian infrastructure in shaping pedestrian safety. While population density and land use diversity impact accident rates, the presence of crosswalks and street configurations play crucial roles. Our findings underscore the urgency for urban planners to prioritize pedestrian safety through targeted interventions, such as enhancing crosswalks, reducing speed limits and promoting mixed land use. Future research should explore additional variables, alternative modelling techniques and non-linear approaches to gain a more comprehensive understanding of these complex relationships.