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Dissertations / Theses on the topic 'Computer storage devices'

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Published: 4 June 2021

Last updated: 29 July 2024

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1

Marmol, Leonardo. "Customized Interfaces for Modern Storage Devices." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3165.

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In the past decade, we have seen two major evolutions on storage technologies: flash storage and non-volatile memory. These storage technologies are both vastly different in their properties and implementations than the disk-based storage devices that current soft- ware stacks and applications have been built for and optimized over several decades. The second major trend that the industry has been witnessing is new classes of applications that are moving away from the conventional ACID (SQL) database access to storage. The resulting new class of NoSQL and in-memory storage applications consume storage using entirely new application programmer interfaces than their predecessors. The most significant outcome given these trends is that there is a great mismatch in terms of both application access interfaces and implementations of storage stacks when consuming these new technologies. In this work, we study the unique, intrinsic properties of current and next-generation storage technologies and propose new interfaces that allow application developers to get the most out of these storage technologies without having to become storage experts them- selves. We first build a new type of NoSQL key-value (KV) store that is FTL-aware rather than flash optimized. Our novel FTL cooperative design for KV store proofed to simplify development and outperformed state of the art KV stores, while reducing write amplification. Next, to address the growing relevance of byte-addressable persistent memory, we build a new type of KV store that is customized and optimized for persistent memory. The resulting KV store illustrates how to program persistent effectively while exposing a simpler interface and performing better than more general solutions. As the final component of the thesis, we build a generic, native storage solution for byte-addressable persistent memory. This new solution provides the most generic interface to applications, allow- ing applications to store and manipulate arbitrarily structured data with strong durability and consistency properties. With this new solution, existing applications as well as new “green field” applications will get to experience native performance and interfaces that are customized for the next storage technology evolution.

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2

Florence, Trevor Bradshaw. "KiwiVault: Encryption Software for Portable Storage Devices." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2156.

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While many people use USB flash drives, most do not protect their stored documents. Solutions for protecting flash drives exist but inherently limit functionality found in unprotected drives such as portability, usability, and the ability to share documents between multiple people. In addition, other drawbacks are introduced such as the possibility of losing access to protected documents if a password is lost. Assuming protecting portable documents is important, in order for people to be willing to protect their documents they should be required to make as few sacrifices in functionality as possible. We introduce KiwiVault, a USB flash drive encryption solution that retains more of the functionality found in unprotected storage devices than preceding solutions. In addition, this thesis reviews encryption solutions appropriate for portable data storage, reviews security components used by KiwiVault, discusses the design and implementation of KiwiVault, discusses a user study and threat analysis conducted to validate KiwiVault as a solution, and proposes future work.

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3

Chan, Chun Keung. "A study on non-volatile memory scaling in the sub-100nm regime /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20CHAN.

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4

Ketrick, Robert Paul. "Design, fabrication and implementation of a hash table processor /." Online version of thesis, 1987. http://hdl.handle.net/1850/10497.

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5

Sudirgo, Stephen. "Quantum and spin-based tunneling devices for memory systems /." Link to online version, 2006. https://ritdml.rit.edu/dspace/handle/1850/2066.

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6

Ankireddipally, L. R. "Formalization of storage considerations in software design." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=548.

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Thesis (Ph. D.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains vii, 110 p. : ill. Includes abstract. Includes bibliographical references (p. 95-97).

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7

Langston, Jeremy W. "Availability and performance analysis of data hot-spots in distributed storage systems a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1797609571&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268408220&clientId=28564.

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8

Day, Daniel John, and DDay@groupwise swin edu au. "Three-dimensional bit optical data storage in a photorefractive polymer." Swinburne University of Technology. Centre for Micro-Photonics, 2001. http://adt.lib.swin.edu.au./public/adt-VSWT20050307.112258.

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As the computer industry grows, so will the requirements for data storage. Magnetic memory has been the most stable method in terms of capacity and recording/reading speed. However, we have reached the point where a substantial increase in the capacity cannot be produced without increasing the size of the system. When compact discs (CDs) were introduced in the 1980�s they revolutionized the concept of data storage. While the initial force behind compact discs could easily be said to be the music industry, once recordable and rewritable discs became available they quickly found more use in the computer industry as backup devices. Since their inception, the capacity requirements have far exceeded what is available on a compact disc, and they are now following the same path as magnetic memories. Following this trend, it could be assumed that digital versatile discs or digital video discs (DVDs) have a limited lifetime as a storage medium. In fact it has been noted (Higuchi et al., 1999) that the maximum capacity of digital video discs will be reached in 3 � 5 years. The question then is, what comes next? The efficiency of conventional optical data storage is extremely poor. For an optically thick recording medium, both CDs and DVDs use less than 0.01% of the total volume to store the information. Three-dimensional bit optical data storage endeavors to increase the efficiency by recording information in a volume that is greater than 90% of the total volume. The concept of three-dimensional bit optical data storage was first proposed by Parthenopoulos and Rentzepis in 1989, where they demonstrated that capacities far exceeding that of compact discs could be achieved. Three-dimensional bit optical data storage relies on creating a highly localised chemical or physical change within a recording medium, such that further layers can be recorded without causing interference. Ideally the chemical/physical change in the material should be reversible to enable erasable/rewritable data storage. In order to create a highly localised effect nonlinear excitation can be used; whereby the excitation is limited to a small region around the focal spot. Depending on the material and recording method there are several techniques for reading the information such as transmission imaging or reflection confocal microscopy. However, all the recording and reading methods require focusing to a deep position within a recording medium, such focusing encounters spherical aberration as a result of the difference in the refractive indices between the immersion and recording media. This thesis has concentrated on several areas to understand and develop the concept of three-dimensional bit optical data storage. The photorefractive effect in crystals has been studied for many years and is now widely used in optoelectronic devices. The use of photorefractive polymers is a relatively new and exciting development in optical data storage. Until now they have been used solely in the area of holographic data storage. The research in this thesis was conducted using photorefractive materials that were fabricated in two polymer matrices, poly(N-vinylcarbazole) (PVK) and poly(Methyl Methacrylate) (PMMA). The recording samples also consisted of the following compounds in various proportions, 2,5-dimethyl-4-(p-nirtophenylazo)anisole (DMNPAA), 2,4,7-trinitro-9-fluorenone (TNF) and N-ethylcarbazole (ECZ). In this project two-photon excitation was used as the recording mechanism to achieve erasable/rewritable data storage in a photorefractive polymer. As a result of two-photon excitation, the quadratic dependence of excitation on the incident intensity produces an excitation volume that is confined to the focal region in both the transverse and axial directions. Therefore, focusing the laser beam above or below its previous position provides a method by which layers of information can be recorded in the depth direction of a material, without causing interference from neighbouring layers. The feasibility of two-photon excitation in photorefractive polymers is demonstrated in this thesis. The quadratic relationship between excitation and incident light in two-photon excitation requires high photon density to ensure efficient excitation. The use of ultra-short pulsed lasers, while effective, is not a practical solution for an optical data storage system. This thesis demonstrates the ability to produce three-dimensional erasable/rewritable data storage in a photorefractive polymer using continuous wave illumination. Using this technology it has been possible to achieve a density of 88 Gbits/cm3, which corresponds to a capacity of 670 Gbytes on a compact disc sized recording medium. This is an increase of 1000 times the capacity of a CD and 130 times the capacity of current DVDs. While erasable optical data storage is an exciting prospect there are problems associated with the deterioration of the information. For long term information storage a permanent recording process would be more practical. It is demonstrated that there is a point after which further increases in the recording power result in the formation of a micro-cavity. While two-photon excitation is the recording method for erasable data storage, the increase in power results in an increase in ultra-violet absorption such that multi-photon excitation may occur. This thesis demonstrates the ability to record multi-layered arrays of micro-cavities. The change in refractive index associated with an erasable bit is less than 1%. As a result only phase sensitive reading methods (transmission imaging or differential interference contrast (DIC) microscopy) can be used to image a recorded bit. Both transmission and DIC imaging systems have poor axial resolution and therefore limit the density of the recording system, as well as being large optical systems. The introduction of a split or quadrant detector reduces the size of the optical reading system and is demonstrated to be sensitive enough to detect the phase changes of a recorded bit. However, the change in refractive index across a micro-cavity is large enough that reflection confocal microscopy can be used to detect a bit. It is demonstrated in this thesis that multi-layered micro-cavity arrays can be read using reflection confocal microscopy. Focusing of light to deep positions within an optical thick recording medium has the effect of increasing spherical aberration resulting from the refractive index mismatching between the immersion and recording media. The work in this thesis illustrates the effect of spherical aberration on the performance of both the recording and reading systems. The work conducted in this thesis shows the ability to record multi-layered erasable/rewritable information in a photorefractive polymer using pulsed and continuous wave two-photon excitation. It has also been demonstrated that through multi-photon excitation multi-layered micro-cavity arrays can be fabricated. It has also been illustrated that while spherical aberration deteriorates the performance of the recording and reading systems it is possible to achieve a density of greater than 88 Gbits/cm3.

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9

Rothman, Jonathan Sean. "A framework for the secure use of portable storage devices : a South African higher education perspective." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1054.

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South African Higher Education has gone through various changes and challenges, one of these being the merger process. Various Universities and Technikons were forced to merge in an effort to aid the transformation and restructuring of the Higher Education landscape in the post-apartheid era. From an ICT point of view, the merged Institutions ended up with massive and distributed computing facilities. These facilities must be managed and secured and it can be appreciated that the complexity and magnitude of this task is compounded by the large and varied user population (i.e. students) using the facilities. With the exploding use of mobile consumer devices (such as cell phones, personal digital assistants, MP3 players, portable storage devices such as flash drives, etc), Higher Education Institutions are faced with the even more complex task of managing and securing the computing infrastructure, while large numbers of students can enter computer labs and use these devices at random. In some circles, portable devices are touted to be the next panacea in higher education. This, together with the popularity these devices enjoy under the student body, makes it a fait accompli that mobile consumer devices are “here to stay”. Therefore, banning these devices from campus computer labs, is not viable. Universities have to find ways to address security issues through the implementation of appropriate protective measures. This research focuses on finding a solution to mitigating the risks imposed on Higher Education Institutions in South Africa caused by the use of portable storage devices. The research proposes a framework which serves as an outline for the countermeasures that Universities must implement to mitigate the risks inherent to the use of portable storage devices. The scope of the research is limited to flash drives, smart phones and MP3 players.

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10

Folmer, Brennan Thomas. "Metadata storage for file management systems data storage and representation techniques for a file management system /." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001141.

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11

Wu, Weimin. "Materials for organic memory devices." HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1084.

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12

McMahon, Michael J. "An approach for enhanced management of network-attached devices." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442840.

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13

Lakshmanan, Subramanian. "Secure store a secure distributed storage service /." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-08052004-010409/unrestricted/lakshmanan%5Fsubramanian%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Computing, Georgia Institute of Technology, 2005.
Ramachandran, Umakishore, Committee Member ; Lee, Wenke, Committee Member ; Blough, Douglas M., Committee Member ; Venkateswaran, H., Committee Member ; Ahamad, Mustaque, Committee Member. Includes bibliographical references.

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14

Ng, Ka Fai. "Novel low power CAM architecture /." Online version of thesis, 2008. http://hdl.handle.net/1850/7771.

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15

Paulsen, Ronald Ray 1951. "DESIGN AND BUILD OF A STORAGE SYSTEM FOR STRESS TESTING (WORD GENERATOR, SIGNAL SOURCE)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291237.

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16

Wu, Guanying. "Design and evaluation of an adaptive write buffer cache for solid state drives a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=2000396221&SrchMode=1&sid=3&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1277478754&clientId=28564.

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17

Bershad, Brian Nathan. "High performance cross-address space communication /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/6939.

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18

Jones, David John 1969. "Generation and storage of ultrashort pulses using optical fiber devices." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9310.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 1999.
Includes bibliographical references (leaves 106-116).
Three different types of optical fiber devices were investigated for this thesis: actively modelocked fiber lasers, optical fiber ring buffers, and passively mode-locked fiber lasers. Intra-cavity soliton compression was employed in an actively mode-locked fiber laser to reduce the pulse width by a factor of 4.4 below the pulse widths predicted by standard active mode-locking theory. Stability regions for these solitons were mapped out and compared to theoretical predictions. In the second device the dynamics of a 5 Gbit/sec packet of ONES and ZEROS loaded into a phase modulated optical fiber ring buffer were experimentally investigated. A new mode of operation was explored where the cavity length of the buffer was slightly detuned from the modulation frequency that was driving the phase modulator. An investigation into the conditions for successful loading and the storage behavior was performed. In addition, relaxation oscillations, which have affected the storage time of previous high-speed optical ring buffers, were nearly eliminated with a CW holding beam, and significantly enhanced storage times were obtained. Investigations of passively mode-locked fiber lasers included both soliton and stretched-pulse implementations. Two different versions using the soliton configuration were studied; in both cases a waveguide amplifier was used to provide gain, allowing short cavity lengths. A polarization additive-pulse mode- locked version generated 116-fs, 130 pJ solitons at a repetition rate of 130 MHz. Preliminary work was also completed on a second short cavity soliton laser with a semiconductor saturable absorber mirror as the mode-locking mechanism. Using the stretched-pulse cavity design, an environmentally-stable fiber laser was demonstrated to generate 1.8 nJ pulses that were compressible to sub-100 fs. 980-nm pumping requirements for this laser were only 200 mW. Lastly, the first observation and characterization of resonant sideband formation in stretched-pulse fiber lasers was completed. Experimental results were evaluated in conjunction with numerical simulations and a theoretical analysis.
by David John Jones.
Ph.D.

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19

Harmon, C. Reid Jr. "IPU/LTB:a method for reducing effective memory latency." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5352.

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Chen, Tien-Fu. "Data prefetching for high-performance processors /." Thesis, Connect to this title online; UW restricted, 1993. http://hdl.handle.net/1773/6871.

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Harmon, C. Reid. "IPU/LTB a method for reducing effective memory latency /." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180020/unrestricted/harmon%5Fc%5Fr%5F200312%Fphd.pdf.

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22

Liu, Chengjian. "ESetStore: an erasure-coding based distributed storage system with fast data recovery." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/507.

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The past decade has witnessed the rapid growth of data in large-scale distributed storage systems. Triplication, a reliability mechanism with 3x storage overhead and adopted by large-scale distributed storage systems, introduces heavy storage cost as data amount in storage systems keep growing. Consequently, erasure codes have been introduced in many storage systems because they can provide a higher storage efficiency and fault tolerance than data replication. However, erasure coding has many performance degradation factors in both I/O and computation operations, resulting in great performance degradation in large-scale erasure-coded storage systems. In this thesis, we investigate how to eliminate some key performance issues in I/O and computation operations for applying erasure coding in large-scale storage systems. We also propose a prototype named ESetStore to improve the recovery performance of erasure-coded storage systems. We introduce our studies as follows. First, we study the encoding and decoding performance of the erasure coding, which can be a key bottleneck with the state-of-the-art disk I/O throughput and network bandwidth. We propose a graphics processing unit (GPU)-based implementation of erasure coding named G-CRS, which employs the Cauchy Reed-Solomon (CRS) code, to improve the encoding and decoding performance. To maximize the coding performance of G-CRS by fully utilizing the GPU computational power, we designed and implemented a set of optimization strategies. Our evaluation results demonstrated that G-CRS is 10 times faster than most of the other coding libraries. Second, we investigate the performance degradation introduced by intensive I/O operations in recovery for large-scale erasure-coded storage systems. To improve the recovery performance, we propose a data placement algorithm named ESet. We define a configurable parameter named overlapping factor for system administrators to easily achieve desirable recovery I/O parallelism. Our simulation results show that ESet can significantly improve the data recovery performance without violating the reliability requirement by distributing data and code blocks across different failure domains. Third, we take a look at the performance of applying coding techniques to in-memory storage. A reliable in-memory cache for key-value stores named R-Memcached is designed and proposed. This work can be served as a prelude of applying erasure coding to in-memory metadata storage. R-Memcached exploits coding techniques to achieve reliability, and can tolerate up to two node failures. Our experimental results show that R-Memcached can maintain very good latency and throughput performance even during the period of node failures. At last, we design and implement a prototype named ESetStore for erasure-coded storage systems. The ESetStore integrates our data placement algorithm ESet to bring fast data recovery for storage systems.

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23

Esterhuyse, Eben. "On providing an efficient and reliable virtual block storage service." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/51862.

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Thesis (MComm)--Stellenbosch University, 2001.
ENGLISH ABSTRACT: This thesis describes the design and implementation of a data storage service. Many clients can be served simultaneously in an environment where processes execute on different physical machines and communicate via message passing primitives. The service is provided by two separate servers: one that functions at the disk block level and another that maintains files. A prototype system was developed first in the form of a simple file store. The prototype served two purposes: (1) it extended the single-user Oberon system to create a multiuser system suitable to support group work in laboratories, and (2) it provided a system that could be measured to obtain useful data to design the final system. Clients access the service from Oberon workstations. The Oberon file system (known as the Ceres file system) normally stores files on a local disk. This system was modified to store files on a remote Unix machine. Heavily used files are cached to improve the efficiency of the system. In the final version of the system disk blocks are cached, not entire files. In this way the disks used to store the data are unified and presented as a separate virtual block service to be used by file systems running on client workstations. The virtual block server runs on a separate machine and is accessed via a network. The simplicity of the block server is appealing and should in itself improve reliability. The main concern is efficiency and the goal of the project was to determine whether such a design can be made efficient enough to serve its purpose.
AFRIKAANSE OPSOMMING:Hierdie tesis omskryf die ontwerp en implementasie van 'n data stoor diens. Verskeie gebruikers word bedien deur die diens wat funksioneer in 'n verspreide omgewing: 'n omgewing waar prosesse uitvoer op verskillende masjiene en met mekaar kommunikeer met behulp van boodskappe wat rondgestuur word. Die diens word verskaf deur twee bedieners: die eerste wat funksioneer op 'n blok vlak en die ander wat lers onderhou. 'n Prototipe leer diens is ontwikkel deur middel van 'n basiese leer stoor. Die prototipe het twee funksies verrig: (1) die enkel gebruiker Oberon stelsel is uitgebrei na 'n veelvoudige gebruiker stelsel bruikbaar vir groepwerk in 'n laboratorium omgewing, en (2) 'n stelsel is verskaf wat betroubare en akkurate data kon verskaf vir die ontwerp van die finale stelsel. Oberon werkstasies word gebruik met die leer diens. Die Oberon leer stelsel (ook bekend as die Ceres leer stelsel) stoor normaalweg leers op 'n lokale skyf. Hierdie bestaande stelsel is verander om leers te stoor op 'n eksterne Unix masjien. Leers wat die meeste in gebruik is word in geheue aangehou vir effektiwiteits redes. Die finale weergawe van die stelsel berg skyf blokke in geheue, nie leers nie. Hierdie metode laat dit toe om data te stoor op 'n standaard metode, bruikbaar deur verskillende tipes leer stelsels wat uitvoer op verskeie gebruikers se werkstasies. Die virtuele blok stoor voer uit op 'n aparte masjien en is bereikbaar via 'n netwerk. Die eenvoudige ontwerp van die diens is opsigself aanloklik en behoort betroubaarheid te verbeter. Die hoof bekommernis is effektiwiteit en die hoofdoel van die projek was om te bepaal of hierdie ontwerp effektief genoeg gemaak kon word.

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Bellam, Kiranmai Qin Xiao. "Improving reliability, energy-efficiency and security of storage systems and real-time systems." Auburn, Ala, 2009. http://hdl.handle.net/10415/1722.

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Ou, Li. "Design of a high performance and high availability distributed storage system : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online version, 2006. http://proquest.umi.com/pqdweb?index=92&did=1296095771&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1256222043&clientId=28564.

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26

Gilgeous, Latoya Tabita. "An integrated software/hardware approach to detecting memory bounds violations." Diss., Online access via UMI:, 2007.

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Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Electrical and Computer Engineering, 2007.
Includes bibliographical references.

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27

Crowell, Jonathan B. "Multifractal analysis of memory usage patterns." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2240.

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Thesis (M.S.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains vii, 47 p. : ill. Includes abstract. Includes bibliographical references (p. 45-47).

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Asok, Kumar Aarthi. "TECHNICAL AND ECONOMIC IMPACTS OF DISTRIBUTED GENERATORS AND ENERGY STORAGE DEVICES ON THE ELECTRIC GRID." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11142008-151157/.

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In recent years, Distributed Generators (DGs) and energy storage devices have gained more popularity due to growing energy and environmental concerns. Interconnection of DGs and storage devices in an electricity grid impacts its performance under steady state and transient conditions. This research aims at analyzing the impacts of distributed generators and energy storage devices on the transient stability of the grid. Battery and ultra-capacitor technologies have been taken as the two types of storage devices and their electrical characteristics have been modeled using Simulink. Impact of these devices has been analyzed by connecting them to the system by means of suitable power electronic converters. The developed methodology has been evaluated using small test systems in MATLAB/Simulink. Transient stability of the test systems has been assessed for different types and locations of faults as well as for different penetration levels of the DGs, with and without the energy storage devices. Impact on the system transient stability has been analyzed based on transient response of the generator rotor speed deviation, rotor angle and terminal voltage of the DGs. Finally, economic analyses have been carried out for different options of DGs, based on wind, diesel and biomass, along with the energy storage devices. Results indicate that the presence of DGs and storage devices enhances the transient stability of the system in most of the cases.

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Schulte, Daniel Leon. "Interactive Techniques Between Collaborative Handheld Devices and Wall Displays." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3763.

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Handheld device users want to work collaboratively on large wall-sized displays with other handheld device users. However, no software frameworks exist to support this type of collaborative activity. This thesis introduces a collaborative application framework that allows users to collaborate with each other across handheld devices and large wall displays. The framework is comprised of a data storage system and a set of generic interactive techniques that can be utilized by applications. The data synchronization system allows data to be synchronized across multiple handheld devices and wall displays. The interactive techniques enable users to create data items and to form relationships between those data items. The framework is evaluated by creating two sample applications and by conducting a set of user study interactive tasks. The data recorded from these evaluations shows that the framework is easy to extend, and that with minimal training, the generic interactive techniques are easy to learn and effective.

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30

Deschler, Kurt W. "MASS a multi-axis storage structure for large XML documents." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0506102-113510.

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Lu, Chih-Yuan. "Group III-selenides : new silicon compatible semiconducting materials for phase change memory applications /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/10610.

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Muravsky, Alexander. "Photoalignment in optical rewritable (ORW) e-paper and photonics : physics & application /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20MURAVS.

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33

Chen, Danti. "Local electron transport of organic semiconducting monolayers /." Connect to online version, 2009. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2009/363.pdf.

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Ammari, Rami J. "A study for reducing conflict misses in data cache." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-04032004-211908.

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Gamble, Stephen R. "Reversible solid oxide fuel cells as energy conversion and storage devices." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2454.

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A reversible solid oxide fuel cell (RSOFC) system could buffer intermittent electrical generation, e.g. wind, wave power by storing electrical energy as hydrogen and heat. RSOFC were fabricated by thermoplastic extrusion of (La₀.₈Sr₀.₂)₀.₉₅MnO[subscript(3−δ)] (LSM) ceramic support tubes, which were microstructurally stable with 55% porosity at 1350°C. A composite oxygen electrode of LSM-YSZ was applied, providing a homogeneous substrate for a 20 μm - 30 μm thick YSZ electrolyte. A dip-coated 8YSZ slurry, and a painted commercial 3YSZ ink gave sintered densities of 90% and nearly 100% at 1350°C, respectively. A porous NiO/YSZ fuel electrode was also painted on. A Ag/Cu reactive air braze was unsuccessful at forming a void-free joint between the RSOFC and a 316 stainless steel gas delivery tube, as the braze did not penetrate the oxidation layer on the steel. Two alumina-based ceramic cements failed to fully seal the cell to an alumina gas delivery tube, due to thermal expansion coefficient mismatches and porosity after curing. Therefore, the maximum open circuit voltage (OCV) obtained during RSOFC testing was 0.8 V at 440°C. LSM-YSZ symmetrical cell performance measurements with oxygen pressure showed a diffusion polarisation, which was assigned to dissociative adsorption and surface diffusion of oxygen species. A collaborative RSOFC system software model showed ohmic and activation losses dominated the RSOFC, and diffusion losses were insignificant. Pressurisation from 1 to 70 bar increased the RSOFC Nernst voltage by 11% at 900°C, and reduced the entropy of the gases, reducing heat production and increasing electrical efficiency. A 500 kg Sn/Cu phase change heat store prevented the system overheating. Over a 16 h discharge-charge RSOFC cycle in the range 5 mol.% - 95 mol.% hydrogen in steam, at 20.4 A per cell or 3250 A m⁻², the electrical energy storage efficiency was 64.4%.

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36

Squillante, Mark S. "Issues in shared-memory multiprocessor scheduling : a performance evaluation /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/6858.

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37

Xiong, Bo. "A trace-driven simulation study of cache memories." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/562779.

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The purpose of this study is to explore the relationship between hit ratio of cache memory and design parameters. Cache memories are widely used in the design of computer system architectures to match relatively slow memories against fast CPUs. Caches hold the active segments of a program which are currently in use. Since instructions and data in cache memories can be referenced much faster than the time required to access main memory, cache memories permit the execution rate of the machine to be substantially increased. In order to function effectively, cache memories must be carefully designed and implemented. In this study, a trace-driven simulation study of direct mapped, associative mapped and set-associative mapped cache memories is made. In the simulation, cache fetch algorithm, placement policy, cache size and various parameters related to cache design and the resulting effect on system performance is investigated. The cache memories are simulated using the C language and the simulation results are analyzed for the design and implementation of cache memories.
Department of Physics and Astronomy

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38

Gao, Shen. "Transaction logging and recovery on phase-change memory." HKBU Institutional Repository, 2013. http://repository.hkbu.edu.hk/etd_ra/1549.

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39

Katebi, Ataur Rahim. "Supporting snapshots in a log-based file system." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008900.

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40

Zhang, Xiushan. "L2 cache replacement based on inter-access time per access count prediction." Diss., Online access via UMI:, 2009.

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41

Kim, Hyojun. "Informed storage management for mobile platforms." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45768.

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Storage devices are rapidly changing, and we need to adapt the OS storage software stack to keep up with the changes. Such a re-evaluation of the storage software stack is especially required for mobile platforms because they are relying on inexpensive flash storage devices having very different performance characteristics from the familiar hard disk.In this thesis work, we first show the importance of storage in mobile platforms; contrary to conventional wisdom, we find evidence that storage is a significant contributor to application performance on mobile devices. Then, we explore the solution space for flash storage; user-level library for selective logging, host-side write buffering layer, and OS buffer replacement scheme for flash storage have been studied. Finally, we build an integrated solution for smartphone storage, named Fjord. In the Fjord study, we re-design logging and RAM buffering solutions for smartphones, and also propose fine-grained reliability control mechanisms. We prove that non-volatile logging can improve storage performance remarkably. Understanding the characteristics of cloud-backed applications and controlling the reliability constraint for chosen cloud-backed applications can achieve additional significant performance gain.We implement and evaluate our solution on a real Android smartphone, and demonstrate significant performance gains for everyday apps on such platforms.

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42

Eckart, J. Dana. "Garbage collection for functional languages in a distributed system." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/8159.

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43

Rust, A. N. "A second generation SUNSAT RAMDISK." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51620.

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Thesis (MEng)--Stellenbosch University, 2000.
ENGLISH ABSTRACT: The SUNSAT RAMDISK was studied, and tests performed to assess its flight readiness. Errors were detected, and modifications had to be made to ensure proper operation. SUNSAT was subsequently launched, and to date the RAMDISK is still functioning correctly. The flight readiness testing of the RAMDISK was considered a pre-study to designing a second generation RAMDISK. A conceptual mass memory storage device support structure was designed. This second generation RAMDISK, or memory drive is intended to be used on a second generation SUNSAT, or SUNSAT 2. The design is targeted for implementation in fields programmable gate arrays (FPGA's) and was realised using VHDL. This hardware description language is an accepted standard, and can be implemented in a number of different programmable logic devices; both SRAM and fuse-link based. Simulations were performed to verity the functionality of the design, and to determine whether the data transfer specifications could be met using programmable logic devices. A modular design methodology was followed. The memory drive was designed so that any type and amount of memory can be added to the drive without a major design change. The simulations indicated that a data capturing speed of 130 Mbits/s could be maintained.
AFRIKAANSE OPSOMMING: Die SUNSAT massa geheue module is bestudeer, en toetse is daarop uigevoer om die vlug gereedheid te bepaal. Foute is gevind, en veranderinge moes aangebring word om korrekte werking te verseker. SUNSAT is gelanseer en die geheue module werk tot op datum nog korrek. Die geheue module se vlug gereedheid toetse is beskou as In voor studie vir die ontwerp van In tweede generasie geheue module. In Konseptueie massa stoor toestel struktuur is ontwerp. Hierdie tweede generasie geheue module, of geheue skyf is bedoel om op In tweede generasie SUNSAT, of SUNSAT 2 gebruik te word. FPGA's is die teiken tegnologie vir hierdie ontwerp en VHDL is gebruik om die ontwerp te realiseer. Hierdie hardeware beskrywingstaal word as In standaard aanvaar en kan in verskillende herprogrammeerbare tegnologieë gebruik word. Sirnulasies is gedoen om die funksionaliteit van die ontwerp te verifieer, en om te bepaal of die nodige data oordragstempo gehandhaaf kan word met herprogrammeerbare tegnologie. In Modulêre ontwerpsfilosofie is gevolg. Die geheue skyf is ontwerp sodat dit enige tipe en hoeveelheid geheue kan ondersteun sonder om groot veranderinge aan die ontwerp te doen. Die sirnulasies toon dat In data oordragstempo van 130 Mbits/s gehandhaafkan word.

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Ashwood, Lori-Anne. "Switching behavior in ferromagnetic nanorings /." Connect to online version, 2009. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2009/382.pdf.

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Tang, Hing-fan Anthony. "A hybrid relational data structure for virtual reality modelling /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25101249.

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46

Xiao, Weijun. "Design and analysis of high-performance and recoverable data storages /." View online ; access limited to URI, 2009. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3380540.

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47

Aylward, Charles R. "Quantifying Parkinson's Disease Symptoms Using Mobile Devices." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1689.

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Current assessments for evaluating the progression of Parkinson’s Disease are largely qualitative and based on small sets of data obtained from occasional doctor-patient interactions. There is a clinical need to improve the techniques used for mitigating common Parkinson’s Disease symptoms. Available data sets for researching the disease are minimal, hindering advancement toward understanding the underlying causes and effectiveness of treatment and therapies. Mobile devices present an opportunity to continuously monitor Parkinson’s Disease patients and collect important information regarding the severity of symptoms. The evolution of digital technology has opened doors for clinical research to extend beyond the clinic by incorporating complex sensors in commonly used devices. Leveraging these sensors to quantify characteristic Parkinson’s Disease symptoms may drastically improve patient care and the reliability of symptom assessment. The goal of this project is to design and develop a system for measuring and analyzing the cardinal symptoms of Parkinson’s using mobile devices. An application for the iPhone and Apple Watch is developed, utilizing the sensors on the devices to collect data during the performance of motor tasks. Assessments for tremor, bradykinesia, and postural instability are implemented to mimic UPDRS evaluations normally performed by a neurologist. The application connects to a cloud-based server to transfer the collected data for remote access and analysis. Example MatLab analysis demonstrates potential approaches for extracting meaningful data to be used for monitoring the progression of Parkinson’s Disease and the effectiveness of treatment and therapies. High-level verification testing is performed to show general efficacy of the assessment tasks. The system design successfully lays the groundwork for a mobile device-based assessment tool to objectively measure Parkinson’s Disease symptoms

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48

Blackmore, Matthew. "A Quantitative Analysis of Memory Controller Page Policies." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/660.

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Two common goals in computing system design are increasing performance and decreasing power consumption. DRAM-based memory subsystems are a major component of both system performance and power consumption. Memory controllers employ strategies to efficiently schedule DRAM operations to reduce latency and to utilize DRAM low power modes when possible. One of the most important of these is the page policy, which determines when to close pages in DRAM. An effective DRAM memory controller page policy is important to minimizing power consumption and increasing system performance. This thesis explores the impact memory controller page policy has on performance as measured by the number of page-hits minus page-misses and estimated average memory access latency. I captured real-time DDR3 command and address memory traces for the SPEC CPU2006 benchmarks under three memory controller page policies: closed page, fixed open-page, and Intel's adaptive open-page [1]. Traces were captured using a programmable memory traffic analyzer (PMTA), a device interposed between the DIMM slot and DDR3 DIMM on the motherboard. The memory traces for each benchmark were analyzed to determine the absolute number of page-hits and page-misses that occurred. In software post-processing I simulated a theoretically perfect "oracle" page policy for each captured trace to compare the efficiency of existing policies. The SPEC CPU 2006 benchmarks under the oracle page policy for each trace exhibited an average increase in the number of page-hits minus page-misses of 280.3% and an average decrease in the average memory latency of 11.1%. Two new adaptive open-page policies are proposed and simulated using the captured memory traces. These proposed policies result in an average increase of 74.8% and 62.4% in the number of page-hits minus page-misses over Intel's adaptive open-page policy and an average decrease in the average memory latency of 3.8% and 3.4%.

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49

Koltes, Andreas. "Reconfigurable memory systems for embedded microprocessors." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709244.

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50

Orcutt, Edward Kerry. "Encoding of multi-track (d,k) modulation codes." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185933.

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Multi-track run-length-limited (d,k) modulation codes were recently introduced as a method to increase storage densities in magnetic and optical recording systems. These codes are a generalization of the usual run-length-limited (d,k) codes and provide for increased storage density by relaxing the k-constraint and encoding multiple tracks in parallel. This dissertation focuses on methods of constructing such codes. Two methods are presented. The first uses state-splitting to construct multi-track (d,k) trellis codes. An example is presented in which a (1,3) trellis code is constructed having a code rate of R = 2/3. The second method results in the construction of multi-track (d,k) block codes which are implemented via an enumeration scheme based on the trellis description of the (d,k) constraints. This implementation results in memory requirements which increase only linearly with block length as opposed to the exponential increases arising from look-up table implementations. Additionally, a new class of multi-track codes referred to as redundant multi-track (d,k) codes, is introduced. These redundant codes, unlike the original multi-track (d,k) codes which are completely intolerant of faulty tracks, allow for r faulty tracks while maintaining synchronization.

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