Computer Sciences Commons^™

Augmenting Amdahl's Second Law: A Theoretical Model To Build Cost-Effective Balanced Hpc Infrastructure For Data-Driven Science, Arghya Kusum Das, Jaeki Hong, Sayan Goswami, Richard Platania, Kisung Lee, Wooseok Chang, Seung Jong Park, Ling Liu

Computer Science Faculty Research & Creative Works

High-performance analysis of big data demands more computing resources, forcing similar growth in computation cost. So, the challenge to the HPC system designers is providing not only high performance but also high performance at lower cost. For high performance yet cost-effective cyberinfrastructure, we propose a new system model augmenting Amdahl's second law for balanced system to optimize price-performance-ratio. We express the optimal balance among CPU-speed, I/O-bandwidth and DRAM-size (i.e., Amdahl's I/O-and memory-number) in terms of application characteristics and hardware cost. Considering Xeon processor and recent hardware prices, we showed that a system needs almost 0.17GBPS I/O-bandwidth and 3GB DRAM per …

Coflourish: An Sdn-Assisted Coflow Scheduling Framework For Clouds, Chui Hui Chiu, Dipak Kumar Singh, Qingyang Wang, Seung Jong Park

Computer Science Faculty Research & Creative Works

Existing coflow scheduling frameworks effectively shorten communication time and completion time of cluster applications. However, existing frameworks only consider available bandwidth on hosts and overlook congestion in the network when making scheduling decisions. Through extensive simulations using the realistic workload probability distribution from Facebook, we observe the performance degradation of the state-of-the-art coflow scheduling framework, Varys, in the cloud environment on a shared data center network (DCN) because of the lack of network congestion information. We propose Coflourish, the first coflow scheduling framework that exploits the congestion feedback assistances from the software-defined-networking (SDN)-enabled switches in the networks for available bandwidth …

Security, Computation And Data Issues In Clouds, Lifeng Li

Student Theses and Dissertations

Recently, Cloud has become quite attractive due to its elasticity, availability, and scalability. However, the technologies such as virtualization build up Cloud appear like a double-edged sword because of the expansion on attacking surfaces to entire hardware-software stack. Moreover, homogeneous computing in Cloud severely limits the computational power it could potentially provide. As a result, it is strongly desired to have new and comprehensive solutions to take in all benefits from Cloud and suppress backsides. This thesis proposes three new solutions to address security, computation and data issues in Cloud. Firstly, a GPU MapReduce framework specifically aims at improving performance …

Graphh: High Performance Big Graph Analytics In Small Clusters, Peng Sun, Yonggang Wen, Nguyen Binh Duong Ta, Xiaokui Xiao

Research Collection School Of Computing and Information Systems

It is common for real-world applications to analyze big graphs using distributed graph processing systems. Popular in-memory systems require an enormous amount of resources to handle big graphs. While several out-of-core approaches have been proposed for processing big graphs on disk, the high disk I/O overhead could significantly reduce performance. In this paper, we propose GraphH to enable highperformance big graph analytics in small clusters. Specifically, we design a two-stage graph partition scheme to evenly divide the input graph into partitions, and propose a GAB (GatherApply-Broadcast) computation model to make each worker process a partition in memory at a time. …

Joanaudit: A Tool For Auditing Common Injection Vulnerabilities, Julian Thome, Lwin Khin Shar, Domenico Bianculli, Lionel Briand

Research Collection School Of Computing and Information Systems

JoanAudit is a static analysis tool to assist security auditors in auditing Web applications and Web services for common injection vulnerabilities during software development. It automatically identifies parts of the program code that are relevant for security and generates an HTML report to guide security auditors audit the source code in a scalable way. JoanAudit is configured with various security-sensitive input sources and sinks relevant to injection vulnerabilities and standard sanitization procedures that prevent these vulnerabilities. It can also automatically fix some cases of vulnerabilities in source code — cases where inputs are directly used in sinks without any form …

A System For Stratified Sampling Of Entity Resolution Results To Assess And Improve Accuracy With Minimal Clerical Review Effort, Daniel L. Pullen

Theses and Dissertations

Organizations across many industries from banking to medicine depend on master data that describe their customers, products and services. Data integration and unique representations of master data are supported by Entity Resolution processes to link records for the same master entity. Master data is key to the core operations of these organizations. Unfortunately, many of these organizations do not use a systematic method, or in some cases, use no method for measuring and improving the quality of record linkage provided by Entity Resolution. This research presents an implementation and proposed methodology for routinely and systematically measuring the quality of Entity …

A Digital Practice Tool For Chemical Resonance, Kimball Jaclyn

Dartmouth College Master’s Theses

Digital practice tools support online learning in math, language, computer science, and other subjects, but practice with problems whose answers are not well represented by text or quantities is underrepresented in the digital learning ecosystem beyond multiple-choice questions. This thesis project explored an alternative to multiple choice practice problems in organic chemistry that does not rely on a molecule drawing interface. This project included development and evaluation of a proof-of-concept digital practice tool for chemical resonance problems. Results of a utility study strongly suggest that the practice tool could fill a learning niche within organic chemistry practice as part of …

Sequential Schemes For Frequentist Estimation Of Properties In Statistical Model Checking, Cyrille Jegourel, Jun Sun, Jin Song Dong

Research Collection School Of Computing and Information Systems

Statistical Model Checking (SMC) is an approximate verification method that overcomes the state space explosion problem for probabilistic systems by Monte Carlo simulations. Simulations might be however costly if many samples are required. It is thus necessary to implement efficient algorithms to reduce the sample size while preserving precision and accuracy. In the literature, some sequential schemes have been provided for the estimation of property occurrence based on predefined confidence and absolute or relative error. Nevertheless, these algorithms remain conservative and may result in huge sample sizes if the required precision standards are demanding. In this article, we compare some …

Automated Software Testing In The Dod: Current Practices And Opportunities For Improvement, Darryl K. Ahner, James Wisnowski, James R. Simpson

Faculty Publications

The concept of automating the testing of software-intensive systems has been around for decades, but the practice of automating testing is scarce in many industries, especially in the government defense sector. A one-year project initiated by the Office of the Secretary of Defense (OSD), Scientific Test and Analysis Techniques Center of Excellence (STAT COE) and sponsored by Navy OPNAV N94 set out to:

• study the degree to which the Department of Defense (DoD) has adopted automated software testing (AST);

• share the best software practices used by industry; and

• develop and distribute an AST implementation guide intended for program management and …

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Lung Ct Radiomics: An Overview Of Using Images As Data, Samuel Hunt Hawkins

USF Tampa Graduate Theses and Dissertations

Lung cancer is the leading cause of cancer-related death in the United States and worldwide. Early detection of lung cancer can help improve patient outcomes, and survival prediction can inform plans of treatment. By extracting quantitative features from computed tomography scans of lung cancer, predictive models can be built that can achieve both early detection and survival prediction. To build these predictive models, first a detected lung nodule is segmented, then image features are extracted, and finally a model can be built utilizing image features to make predictions. These predictions can help radiologists improve cancer care.

Building predictive models based …

Improving Speech Recognition For Interviews With Both Clean And Telephone Speech, Sung Woo Choi

Journal of Undergraduate Research at Minnesota State University, Mankato

High quality automatic speech recognition (ASR) depends on the context of the speech. Cleanly recorded speech has better results than speech recorded over telephone lines. In telephone speech, the signal is band-pass filtered which limits frequencies available for computation. Consequently, the transmitted speech signal may be distorted by noise, causing higher word error rates (WER). The main goal of this research project is to examine approaches to improve recognition of telephone speech while maintaining or improving results for clean speech in mixed telephone-clean speech recordings, by reducing mismatches between the test data and the available models. The test data includes …

Neuronal Correlation Parameter In The Idea Of Thermodynamic Entropy Of An N-Body Gravitationally Bounded System, Ioannis Haranas, Ioannis Gkigkitzis, Ilias S. Kotsireas, Carlos Austerlitz

Physics and Computer Science Faculty Publications

Understanding how the brain encodes information and performs computation requires statistical and functional analysis. Given the complexity of the human brain, simple methods that facilitate the interpretation of statistical correlations among different brain regions can be very useful. In this report we introduce a numerical correlation measure that may serve the interpretation of correlational neuronal data, and may assist in the evaluation of different brain states. The description of the dynamical brain system, through a global numerical measure may indicate the presence of an action principle which may facilitate a application of physics principles in the study of the human …

Impacts Of Java Language Features On The Memory Performances Of Android Apps, Yoonsik Cheon, Adriana Escobar De La Torre

Departmental Technical Reports (CS)

Android apps are written in Java, but unlike Java applications they are resource-constrained in storage capacity and battery lifetime. In this document, we perform an experiment to measure quantitatively the impact of Java language and standard API features on the memory efficiency of Android apps. We focus on garbage collection because it is a critical process for performance affecting user experience. We learned that even Java language constructs and standard application programming interfaces (APIs) may be a source of a performance problem causing a significant memory overhead for Android apps. Any critical section of code needs to be scrutinized on …

Methods For Real-Time Prediction Of The Mode Of Travel Using Smartphone-Based Gps And Accelerometer Data, Bryan D. Martin, Vittorio Addona, Julian Wolfson, Gediminas Adomavicius, Yingling Fan

Faculty Publications

We propose and compare combinations of several methods for classifying transportation activity data from smartphone GPS and accelerometer sensors. We have two main objectives. First, we aim to classify our data as accurately as possible. Second, we aim to reduce the dimensionality of the data as much as possible in order to reduce the computational burden of the classification. We combine dimension reduction and classification algorithms and compare them with a metric that balances accuracy and dimensionality. In doing so, we develop a classification algorithm that accurately classifies five different modes of transportation (i.e., walking, biking, car, bus and rail) …

Need For A Large-N Array (And Wavelets And Differences) To Determine The Assumption-Free 3-D Earth Model, Solymar Ayala Cortez, Aaron A. Velasco, Vladik Kreinovich

Departmental Technical Reports (CS)

One of the main objectives of geophysical seismic analysis is to determine the Earth's structure. Usually, to determine this structure, geophysicists supplement the measurement results with additional geophysical assumptions. An important question is: when is it possible to reconstruct the Earth's structure uniquely based on the measurement results only, without the need to use any additional assumptions? In this paper, we show that for this, one needs to use large-N arrays -- 2-D arrays of seismic sensors. To actually perform this reconstruction, we need to use differences between measurements by neighboring sensor and we need to apply wavelet analysis to …

Laplacian Distribution And Domination, Domingos M. Cardoso, David P. Jacobs, Vilmar Trevisan

Publications

No abstract provided.

Circumferences Of 3-Connected Claw-Free Graphs, Ii, Zhi-Hong Chen

Scholarship and Professional Work - LAS

For a graph H , the circumference of H , denoted by c ( H ) , is the length of a longest cycle in H . It is proved in Chen (2016) that if H is a 3-connected claw-free graph of order n with δ ≥ 8 , then c ( H ) ≥ min { 9 δ − 3 , n } . In Li (2006), Li conjectured that every 3-connected k -regular claw-free graph H of order n has c ( H ) ≥ min { 10 k − 4 , n } . Later, Li posed …

Active Directory Infrastructure Design And Network Topology Design For Starcom Software Developer Company, Bujar Lushta

Theses and Dissertations

Active Directory is Microsoft trademarked directory service, an integral part of the Windows 2000 architecture and later server operating systems. Like other directory services, such as Novell Directory Services (NDS), Active Directory is a centralized and standardized system that automates network management of user data, security, and distributed resources, and enables interoperation with other directories.

A well-structured Active Directory hierarchy requires a well-defined underlying network infrastructure in which AD forest is built upon. The design shows Cisco best practices in terms of providing layered approach by segmenting the traffic and streamlining network traffic ultimately providing redundancy, scalability and traffic efficiency. …

Show Tech, Albert Bytyçi

Theses and Dissertations

Nga zhvillimi i hovshëm i teknologjisë kanë përfituar shumë fusha të tjera nder to edhe ajo e marketingut të produkteve në platforma të ndryshme. Për ketë arsye bizneset të cilat merren me shitjen e produkteve tani kane qasje në një numër më të madhe të klientëve, sa që është bere thuajse e pa mundur të mendohet ndonjë mënyre me të mirë të reklamimit.

Për të ofruar shërbimin e reklamimit të produkteve teknologjike në mënyre sa me të shpejt dhe të lehtë për bizneset, duke i kursyer kohe dhe resurse për menaxhime sa më të lehtë, është menduar të ofrojmë sistemin …

Protokollet Dhe Siguria Në Transmetim, Alban Blakaj

Theses and Dissertations

Kjo temë diplome ka për qëllim që të kuptojmë në mënyrë të shtjelluar dhe të qartë mënyrën se si funksionon procesi i transmetimit të të dhënave, si për shembull, të një fajlli apo dokumenti. Këtë proces e hasim çdo ditë në punën që bëjmë ose edhe për qëllime të tjera. Padyshim që rrjeti kompjuterik paraqet një ndër inovacionet më të mëdha të njerëzimit në fushën e teknologjisë së komunikimit. Mjafton të përmendim Internetin dhe menjëherë do të kuptojmë se sa i madh është përfitimi i njerëzimit nga rrjeti kompjuterik. Ai, domosdoshmërisht vërteton faktin se rrjetet kompjuterike krahas qëllimit të tyre …

Analiza E Rrjetit Mikrovalor Unazë Për Territorin E Republikës Së Kosovës, Burim Berisha

Theses and Dissertations

Ky punim paraqet mënyrën e ndërtimit të një rrjeti mikrovalor me kapacitetit të lartë të transmetimit të të dhënave, me një topologji unazë. Përmes sistemeve transmetuese telekomunikuese mikrovalore bëhet lidhja e lokacioneve në zona të ndryshme gjeografike. Që të gjitha sinjalet e të dhënave, zërit, videos transmetohen përmes këtij sistemi. Inxhinierët e Telekomunikacionit që merren me projektimin e këtyre rrjetave duhet të kenë njohuri nga Telekomunikacioni, Rrjetat Kompjuterike, Siguria e pajisjeve që e përbëjnë këtë sistem, si dhe të kenë njohuri mbi bazën ligjore të Telekomunikacionit.

Duke marrë parasysh aspektin ekonomik, zhvillimin teknologjik, kohën e ndërtimit të sistemit transmetues, kosto …

Krahasimi I Platformës Laravel Dhe Asp .Net, Burbuqe Beqiraj

Theses and Dissertations

Teknologjia prej vitit në vitë e ka ndryshuar jetën e njeriut, duke e bërë më të lehtë punën dhe jetën në përgjithësi. Duke marr parasysh vitet e shkuara që teknologjia nuk kishte qënë e zhvilluar edhe punët në të gjitha sferat kanë pasur vështërsi të mëdha, duke e krahasuar në ditët e sotme, zhvillimi teknologjik po na mundëson punë më të lehtë në çdo aspekst edhe në çdo sfer të jetës. Tashmë teknologjia është bërë mjeti ynë i informacionit, i argetimit, i sigurisë, i shëndetit, pra në një fare mënyre mbulon të gjitha sferat më të rëndësishme të jetës. Kemi …

Self-Organising Networks And Rapid Handovers At High Speeds In Modern 4g, Blerta Hajdari

Theses and Dissertations

Titulli i temës ngërthen në vete tre tema të ndërlidhura njëra pas tjetrës. Fillimisht do të flitet rreth asaj se qka është rrjeti 4G, ku pasojnë edhe objektivat kryesore të kësaj gjenerate. Më pastaj do të njihemi me historikun e shkurtër të rrjeteve celulare. Teknologjia LTE është standard i 4G-së dhe përbëhet nga disa teknika, teknika këto që shtjellohen në mënyrë të detajizuar. Pjesë esenciale e 4G-së është edhe arkitektura e saj e pasuruar me teknika të avancuara. Pjesa kryesore e që është HANDOVER është qelësi kryesorë i nivelit të kënaqësisë së klientit, arsyjet dhe përfitimet themelore me anë të …

Siguria E Web Shërbimeve Në Platformën Mobile, Shpend Shabani

Theses and Dissertations

World Wide Web-i është shndërruar në një bashkësi shumë të madhe të dhënash të ndërlidhura. Kjo “magazinë” të dhënash është një entitet dinamik dhe sasia e informacionit që ajo ofron, pëson një rritje eksponenciale. Informacioni paraqitet në formën e imazheve, tekstit, videove, audiove, kështu që procesi i kërkimit dhe gjetjës së informacionit të duhur, në mes të gjithë dokumentave që shfaqën, nuk është gjithnjë aq i thjeshtë sa duket. Ne kemi nevojë për teknika dhe mjete që të na e lehtësojnë dhe shpejtojnë këtë process, duke përmbushur kështu qëllimin e kërkimit.

Ndërkohë, web shërbimet janë një mënyrë efektive për komunikim …

Evaluating Student Perceptions And Learning Outcomes: Differences Between Sla-Able And Non-Sla-Able Introductory Programming Courses, Christina M. Frederick, Matthew B. Pierce, Andrew Griggs, Lulu Sun

Publications

Engineering, computer science and subsequently knowledge of programming language is an increasingly vital skill in today’s workforce. First year engineering students are introduced to programming in addition to rigorous course loads in their first year. Second Language Acquisition (SLA) has been applied to programming course content delivery and has shown promise as an effective means of better educating new students. Results will be presented from a NSF funded study conducted over the past two years. SLA was applied to an introductory engineering course that teaches basic programming skills in a Blended learning environment (SLA-aBLe). This study examined four semesters worth …

Front Matter

Journal of Digital Forensics, Security and Law

No abstract provided.

Back Matter

Journal of Digital Forensics, Security and Law

No abstract provided.

Possession Of Child Exploitation Material In Computer Temporary Internet Cache, Sungmi Park, Yunsik Jake Jang, Joshua I. James

Journal of Digital Forensics, Security and Law

When considering the possession of child exploitation material U.S. and German courts have the same focus, but slightly different interpretations. This slight difference in interpretation could mean that in one country a defendant will be found guilty of possession while in the other country he or she could be found not guilty. In this work we examine the standards courts in Germany and the United States have used to combat child pornography, and analyze the approaches specifically related to viewing and possession of CEM. A uniform solution is suggested that criminalizes “knowing access with the intention to view” as a …

Public Security & Digital Forensics In The United States: The Continued Need For Expanded Digital Systems For Security, Deborah G. Keeling, Michael Losavio

Journal of Digital Forensics, Security and Law

Digital Forensics is one of the latest challenges for the use of forensics in the investigative process in the United States. Some of the challenges are created by conditions and circumstances present for law enforcement around the world. However, many are unique to the United States and created by the standards of evidence within our courts, nature of our law enforcement organizations, and structure of our judicial and prosecutorial systems. It is essential for the preservation of public security and individual safety that competent systems of digital forensics are developed for law enforcement at all levels. The failure to do …

What Does Playing Games Teach Us About A Student's Ethical Life?, Robert Mccloud, Tamara Luarasi

WCBT Faculty Publications

Most of our students play video games. A substantial percentage of our students is required to take a computer ethics course before graduation. Both ACM and ABET require some form of computer ethics. This paper addresses gaming ethics as a subset of the computer ethics course. Specifically it considers the case of Grand Theft Auto (GTA), one of the most successful and most criticized game franchises. Through interviews with computer science students the study looks at mainstream reaction to GTA and finds that computer science students, probably one of the more sophisticated groups of gamers, have sometimes surprising ethical views …