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1
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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Hong, Bo. „Storage and file systems for MEMS-based storage /“. Diss., Digital Dissertations Database. Restricted to UC campuses, 2005. http://uclibs.org/PID/11984.
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Pease, David A. „Storage tank: a storage area network file system /“. Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.
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Wang, Feng. „Storage management in large distributed object-based storage systems /“. Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
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Huang, Liang. „On-line storage versus local storage for mobile users“. Thesis, KTH, Kommunikationssystem, CoS, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92211.
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When a user has a mobile device with lots of built-in functions, what would they like to do with it? Of course, interactive voice and videoconferencing, sending SMS & Instant Messaging, listening to music, taking photos, etc. People want to have a device with a large storage capacity, much as they do on a desktop or laptop PC. But sometimes the user does not have sufficient local storage capacity on their mobile device. Online storage is a good solution for this, but the limited battery capacity connectivity must be balanced such require that the mobile decided what should be uploaded/downloaded and when - along with what should be stored locally. This problem is very significant not only theoretically, but also practically. We expect that the online storage will replace storage media, such as CDs and DVDs. Today use of a mobile device is a very popular. Users would like to be able to easily send files to friends in other parts of the work, and share files with these friends. Additionally, users to not want to loose important data (photos, files, ... ), these functions can all be implemented using on-line storage. Use on-line storage should be simpler for the user, thus smart mobile devices should simplify the user’s experience, provide safer file storage (i.e., with a lower risk of data loss), and to store files in the most appropriate location(s).När har en användare en mobil apparat med raddor som builten-in fungerar, vad skade dem gillar med den? Naturligtvis växelverkande uttrycka, och videoconferencingen och att överföra SMS & ögonblickMessaging och att lyssna till musik som tar foto, Etc.-folk, önskar att ha en apparat med en stor lagringskapacitet, mycket, som de gör på en skrivbords- eller laptopPC. Men ibland har användaren inte tillräcklig kapacitet för lokal lagring på deras mobila apparat. Direktanslutet är lagring en god lösning för denna, men den inskränkt batterikapacitetsconnectivityen måste vara balanserat sådan kräver att det mobilt avgjort vad bör uploadeds/nedladdas och när - tillsammans med vad bör lagras lokalt. Detta problem är mycket viktigt inte endast teoretiskt, utan också praktiskt. Vi förväntar att lagringen skar direktanslutet byter ut lagringsmassmedia, liksom CDs och DVDs. I dag är bruk av en mobil apparat ett mycket populärt. Användare skade något liknande överför lätt sparar till vänner i annan begåvning av arbetet och delar sparar med dessa vänner. Dessutom fungerar användare som ska inte önskas att lossa viktiga data (foto, sparar,…), dessa kan alla genomföras genom att använda on-line lagring. Bör on-line lagring för bruk vara enklare för användaren, således bör smart mobila apparater förenkla användaren erfar, ger säkrare sparar lagring (, med ett lägre riskera dvs. av dataförlust), och att lagra sparar i mest anslår lägen.
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Chung, Chanwoo S. M. Massachusetts Institute of Technology. „NOHOST : a new storage architecture for distributed storage systems“. Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107295.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 53-55).
This thesis introduces a new NAND flash-based storage architecture, NOHOST, for distributed storage systems. A conventional flash-based storage system is composed of a number of high-performance x86 Xeon servers, and each server hosts 10 to 30 solid state drives (SSDs) that use NAND flash memory. This setup not only consumes considerable power due to the nature of Xeon processors, but it also occupies a huge physical space compared to small flash drives. By eliminating costly host servers, the suggested architecture uses NOHOST nodes instead, each of which is a low-power embedded system that forms a cluster of distributed key-value store. This is done by refactoring deep I/O layers in the current design so that refactored layers are light-weight enough to run seamlessly on resource constrained environments. The NOHOST node is a full-fledged storage node, composed of a distributed service frontend, key-value store engine, device driver, hardware flash translation layer, flash controller and NAND flash chips. To prove the concept of this idea, a prototype of two NOHOST nodes has been implemented on Xilinx Zynq ZC706 boards and custom flash boards in this work. NOHOST is expected to use half the power and one-third the physical space as compared to a Xeon-based system. NOHOST is expected to support the through of 2.8 GB/s which is comparable to contemporary storage architectures.
by Chanwoo Chung.
S.M.
7
Palmer, Carolyn M. „Charge storage and stimulation in inorganic storage phosphor materials“. Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/15578.
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Samples based on the barium fluorobromide (BaFBr) host lattice were prepared in a pure form and doped to 0.5mol% with KF, KBr, SrF2, SrBr2 and with several rare earth chlorides (EuCl2, LaCl3, CeCl3 and SmCl3). Compounds with stoichiometric variations on the pure and europium doped barium fluoroiodide (general formula BaF1I1-x(:Eu2) where x = 0, 0.25, 0.50, 0.75 or 1) were also synthesised. In addition, the alkali halides NaBr, KBr and RbBr were doped with approximately 0.5mol% of both EuCl2 and InCl. Emission generally occurred at wavelengths between 360nm and 450nm for these materials. None of them had room temperature emission bands that were as intense and narrow as that of BaFBr:Eu2+, because they do not have electronic transitions that are so closely matched to the electron/hole recombination energy as the 4f6 5d1 → 4f7 transition in Eu2+. TL glow curves showed a broad high temperature peak which arose as a result of charged defect migration and a variety of lower temperature peaks that were due to recombination from defect states within the band gap. The F(F') centre was matched to the glow curve peak t 400K and the F(Br-) centre to the lower temperature peak at 370K in a variety of mixed stoichiometry BaFBr-type compounds. It was also observed that a small amount of oxygen within the lattice appeared to enhance the intensity of a couple of the low temperature glove curve peaks, but too much oxygen had the opposite effect and these peaks were quenched. The time dependence of the intensity of PSL at timescales of the order of 100 - 6000 seconds was found to obey a power law decay from 100K to 300K. This could be modelled using random walk kinetics for the migration of the charged defect species. Upon irradiation and photostimulation at low temperatures an increase in the initial intensity of the luminescence and of the magnitude of the gradient of the linear plot was observed. This suggested that more change was stored at low temperatures and that new photostimulable centres were able to form more easily.
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Owens, Alisdair. „Using low latency storage to improve RDF store performance“. Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/185969/.
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Resource Description Framework (RDF) is a flexible, increasingly popular data model that allows for simple representation of arbitrarily structured information. This flexibility allows it to act as an effective underlying data model for the growing Semantic Web. Unfortunately, it remains a challenge to store and query RDF data in a performant manner, with existing stores struggling to meet the needs of demanding applications: particularly low latency, human-interactive systems. This is a result of fundamental properties of RDF data: RDF's small statement size tends to engender large joins with a lot of random I/O, and its limited structure impedes the generation of compact, relevant statistics for query optimisation. This thesis posits that the problem of performant RDF storage can be effectively mitigated using in-memory storage, thanks to RAM's extremely high throughput and rapid random I/O relative to disk. RAM is rapidly reducing in cost, and is finally reaching the stage where it is becoming a practical medium for the storage of substantial databases, particularly given the relatively small size at which RDF datasets become challenging for disk-backed systems. In-memory storage brings with it its own challenges. The relatively high cost of RAM necessitates a very compact representation, and the changing relationship between memory and CPU (particularly increasing RAM access latency) benefits designs that are aware of that relationship. This thesis presents an investigation into creating CPU-friendly data structures, along with a deep study of the common characteristics of popular RDF datasets. Together, these are used to inform the creation of a new data structure called the Adaptive Hierarchical RDF Index (AHRI), an in-memory, RDF-specific structure that outperforms traditional storage mechanisms in nearly every respect. AHRI is validated with a comprehensive evaluation against other commonly used in-memory data structures, along with a real world test against a memory-backed store, and a fast disk-based store allowed to cache its data in RAM. The results show that AHRI outperforms these systems with regards to both space consumption and read/write behaviour. The document subsequently describes future work that should provide substantial further improvements, making the use of RAM for RDF storage even more compelling.
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Haver, Eirik, Eivind Melvold und Pål Ruud. „Cloud Storage Vault“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13812.
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Today, major IT-companies, such as Microsoft, Amazon and Google, are offering online storage services to their customers. This is a favourable solution -- as opposed to regular storage -- in terms of low costs, reliability, scalability and capacity. However, important security features such as data privacy and integrity are often absent.To address these issues, a cryptographic architecture is proposed that ensures the confidentiality and integrity of the data stored by users, independent of the trust of the provider. This includes secure sharing of private data among users of the same service.The underlying cryptographic architecture is based on existing open source systems and cryptographic primitives. The architecture was implemented as a reusable general library in Java. An Android client was created, and several performance tests were conducted. The proof of concept system shows that it is possible to implement the proposed scheme, and that the cryptographic operations does not significantly affect the user experience on an Android device. Possible weaknesses of the scheme are identified.We present a scheme for secure storage and sharing of files on an untrusted server, and argue for its validity. To support streaming functionality, the scheme could be extended with hash trees to validate small parts of a file at the time.
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Fohlin, Johan. „Home Storage Manager“. Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17494.
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Knobloch, DI Ralf. „Storage Area Networks“. Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100206.
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Khasymski, Aleksandr Sergeev. „Accelerated Storage Systems“. Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51612.
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Today's large-scale, high-performance, data-intensive applications put a tremendous stress on data centers to store, index, and retrieve large amounts of data. Exemplified by technologies such as social media, photo and video sharing, and e-commerce, the rise of the real-time web demands data stores support minimal latencies, always-on availability and ever-growing capacity. These requirements have fostered the development of a large number of high-performance storage systems, arguably the most important of which are Key-Value (KV) stores. An emerging trend for achieving low latency and high throughput in this space is a solution, which utilizes both DRAM and flash by storing an efficient index for the data in memory and minimizing accesses to flash, where both keys and values are stored. Many proposals have examined how to improve KV store performance in this area. However, these systems have shortcomings, including expensive sorting and excessive read and write amplification, which is detrimental to the life of the flash.
Another trend in recent years equips large scale deployments with energy-efficient, high performance co-processors, such as Graphics Processing Units (GPUs). Recent work has explored using GPUs to accelerate compute-intensive I/O workloads, including RAID parity generation, encryption, and compression. While this research has proven the viability of GPUs to accelerate these workloads, we argue that there are significant benefits to be had by developing methods and data structures for deep integration of GPUs inside the storage stack, in order to achieve better performance, scalability, and reliability.
In this dissertation, we propose comprehensive frameworks that leverage emerging technologies, such as GPUs and flash-based SSDs, to accelerate modern storage systems. For our accelerator-based solution, we focus on developing a system that features deep integration of the GPU in a distributed parallel file system. We utilize a framework that builds on the resources available in the file system and coordinates the workload in such a way that minimizes data movement across the PCIe bus, while exposing data parallelism to maximize the potential for acceleration on the GPU. Our research aims to improve the overall reliability of a PFS by developing a distributed per-file parity generation that provides end-to-end data integrity and unprecedented flexibility. Finally, we design a high-performance KV store utilizing a novel data structure tailored to specific flash requirements; it arranges data on flash in such a way as to minimize write amplification, which is detrimental to the flash cells. The system delivers outstanding read amplification through the use of a trie index and false positive filter.Ph. D.
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Золотова, Світлана Григорівна, Светлана Григорьевна Золотова, Svitlana Hryhorivna Zolotova und Yu S. Potapova. „Energy storage basics“. Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/17575.
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Avlasovych, V. V. „Cloud data Storage“. Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46877.
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Today, the Internet gives us a lot of opportunities. One of them is a
cloud data storage.
Cloud Storage is a model of the data warehouse, which is located in
the network on a large number of servers and provides non-stop customer
access to their data from anywhere and any device with Internet access.
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Drennan, James. „Secure Block Storage“. University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1318611006.
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Tomasetta, Camilla <1983>. „Life Cycle Assessment of Underground Thermal Energy Storage Systems: Aquifer Thermal Energy Storage verus Borehole Thermal Energy Storage“. Master's Degree Thesis, Università Ca' Foscari Venezia, 2013. http://hdl.handle.net/10579/3476.
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Underground Thermal Energy Storage (UTES) systems are energy conservation systems used to buffer the difference between energy supply and energy demand and therefore represent an interesting alternative to energy depletion. At the same time they contribute to cut CO2 emissions by a reduction of energy demand from traditional heating/cooling systems. Even though UTES are relatively environmental friendly solutions they are not completely free of impacts on the underground. They have possible hydro(geo)logical, chemical, thermal or microbiological impacts that are obviously strongly interrelated. The risks of UTES to groundwater quality are insufficiently known, and policies to address this uncertainty are still lacking. In order to improve the understanding and knowledge of UTES techniques, this study aimed to perform a Life Cycle Analysis (LCA) on two different UTES systems: Aquifer Thermal Energy Storage (ATES) and Borehole Thermal Energy Storage (BTES). Even if at present LCA has been mainly performed on products of the industrial and building sector it can be a useful instrument to determine the sustainability of these two possible alternatives of underground exploitation.
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Plasse, Robert. „Vegetable storage, respiration and design criteria in a membrane storage system“. Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65519.
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Meroueh, Laureen. „Electrically charged thermal energy storage systems for grid-level electricity storage“. Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115660.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 155-171).
Unlike most other commodities, electricity produced at any given time must match the electricity being consumed or the stability of the electric grid is jeopardized. Electricity demand changes throughout the day result in required generation ramp-ups that strain power plants, reduce cycle efficiency and increase CO2 emissions. This problem is exacerbated when renewable sources such as wind and solar are integrated into the grid, due to their intermittency. A change in methods of energy production globally that allows synergistic coupling of renewable and fossil fuels is needed. Currently, pumped hydroelectric and compressed air energy storage are the two most common methods of storage, but are highly geographic dependent systems and thus of limited applicability. There exists a strong demand for grid-scale energy storage that are cost-effective and without geographic constraints. In this thesis, storage systems that are charged by electricity and discharged to produce electricity at times of high demand, are theoretically evaluated. Various types of storage such as chemical, thermal, and mechanical, are reviewed to determine the most ideal method for grid-level energy storage. Thermal energy storage systems using phase change materials are most attractive on a cost and energy density basis. Two system designs are evaluated that can couple to both existing and future power plants since they are electrically charged, via joule heating for example, and later discharged to produce electricity using the plant's turbomachinery. Described within is a novel system in which silicon is used as the storage medium and energy release is predominantly through radiative heat transfer. Another design based on the eutectic alloy Al0.88 Si0.12 and other sensible energy storage materials is also evaluated. As an example, the energy storage systems are coupled to a power plant operating according to a supercritical Rankin cycle, and their performance is compared to that of a boiler. Additionally, system cost is compared to existing storage technologies. Although storing electricity as heat and back to electricity is thermodynamically unfavorable, we present an analysis to show that this approach can be cost competitive and provides a segue from fossil fuels to renewable energy.
by Laureen Meroueh.
S.M.
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Chou, Tahsin. „Storage Reduction for Distributed disk-Based Backup in Storage Area Network“. NSUWorks, 2006. http://nsuworks.nova.edu/gscis_etd/452.
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For many organizations today, data is their most important asset. How to safeguard the data in this dynamic environment is an important issue in any organization. The backup process is cumbersome in large organizations. Typically, the backup saves files from a network client to a remote storage location on a daily basis. This means that the same file, often in multiple versions, is saved and stored many times, resulting in excessive storage. A distributed disk-based backup system collects the data to be backed up from network clients and stores files remotely on multiple storage locations in the network. In recent years, Storage Area Network (SAN) has become a popular solution to effectively store or access huge amounts of enterprise information. A SAN is a dedicated storage network designed specifically to connect storage, backup devices, and servers. By consolidating storage in one location, customers benefit from efficiencies of management, utilization, and reliability. Since there is no end in sight to the exponential growth of enterprise data, storage reduction technology plays an important role in enterprise backup. The goal of this study is to investigate how to effectively reduce storage usage through a distributed disk-based backup system in a SAN. The working name for the distributed backup system used for this study is SAN-Backup system. In SAN-Backup system, the backup storage reduction can be made at file level, block level, and backup catalog level. The design and development of this distributed disk-based backup system utilized a phased approach. The prototype of SAN-Backup system was validated through enterprise backup environments. The validation process included backup storage usage and backup performance comparisons between a backup application with an embedded storage reduction technology and a backup application without an embedded storage reduction technology both running in a SAN. The test results showed that SAN-Backup system reduced storage usage by 55.9% when compared to Backup Express Enterprise backup system, and also improved the overall backup performance by 43.74%. The test results indicated that SAN-Backup system did significantly reduce the backup storage usage and also improved the backup performance.
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Yuanjia, Gong. „Multi-version Storage: Code Design and Repair in Distributed Storage Systems“. Thesis, KTH, Teknisk informationsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209546.
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With the rapid growth of data volume, data storage has attracted more and more researchinterests in recent years. Distributed storage systems play important roles ofmeeting the demand for data storage in large amounts. That is, data are stored bymultiple storage nodes which are connected together with various network topologies.The main merits of such distributed storage are faster response, higher reliability andbetter scalability. However, due to network failure, link outage or bu↵er overflow, theupdated data might not be received by all storage nodes, resulting in the coexistenceof multiple versions of the file in the system. Thus, the major challenge is consistency,which means that the latest version of the file is accessible to any read request. We aimto study multi-version storage and code design in distributed storage systems, where thelatest version of the file or a version close to the latest version is recoverable. Moreover,compared to previous studies, higher availability can be achieved in our system model,namely, at least one version of the file can be obtained.On the other hand, both storage nodes and links are vulnerable to fail in storage systems.For the sake of reliability demand, the lost data is supposed to be reconstructed.In this thesis, additional storage nodes dedicated to repair (DR storage nodes) are introducedin the repair process. The results show that optimal repair bandwidth withminimal additional storage space can be achieved by introducing a certain number ofDR storage nodes. Subsequently, linear combinations are provided to reduce the communicationcost of repair where the link cost is high. Last but not the least, we showthat the cooperation among surviving nodes and DR storage nodes suffices to completethe repair process successfully even with link failure.Med tanke på den snabbt växande volymen av data, har intresset för forskning på datalagring vuxit under de senaste åren. Distribuerade lagringssystem spelar en viktig rolli att möta behovet av stora volymer av lagring. Distribuerade lagringssystem är alltsånär data är sparad på flera noder som är sammankopplade på olika sätt i ett nätverk.Jämfört med traditionella lokala lagringar, har distribuerad lagring fördelen att den harkortare svarstider, högre tillförlitlighet och bättre skalbarhet. Men om nätverket gårner, det blir ett länkavbrott eller maxkapaciteten i en buffert nås, kan det hända attall uppdatering inte når ut till alla noder, vilket resulterar i att flera olika versioner aven fil finns sparande samtidigt i systemet. Därför är en av utmaningarna är att varakonsekvent, att det alltid är den senaste versionen av en fil finns tillgänglig för allavid varje given tidpunkt. Målet med detta arbete är att studera flerversionslagrade fileroch hur programmeringsdesignen för distribuerade lagringssystem ser ut. Med andraord, finns det flera versioner av en fil, ska alla kunna återskapas. Jämfört med tidigarestudier, har vi med vårt system uppnått högre tillgänglighet, nämligen att en klient harfått tag i alla fall en version av en fil.Ett vanligt förkommande problem i det distribuerade lagringssystemen är fel i nodernaoch då ska en ny nod skapas för att öka behovet av tillit. I detta projekt, extralagringsnoder för reparation (DR lagringsnoder) är introducerade i reparationsprocessen.Resultatet visar att den optimala reparationsbandbredden med minimalt extra lagringsutrymmekan uppnås genom att introducera en specifikt antal DR lagringsnoder.Efter det, linjärkombinationer är framtagna för att reducera kostnaden att reparera därlänkkostnaden är hög. Sist men inte minst har vi kunnat påvisa att samarbete medandra fortfarande uppkopplade noder och med DR lagringsnoderna räcker för att utföraen lyckad reparationsprocess, även med länkavbrott.
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Svensson, Henrik. „Pre-Study for a Battery Storage for a Kinetic Energy Storage System“. Thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-249173.
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This bachelor thesis investigates what kind of battery system that is suitable for an electric driveline equipped with a mechanical fly wheel, focusing on a battery with high specific energy capacity. Basic battery theory such as the principle of an electrochemical cell, limitations and C-rate is explained as well as the different major battery systems that are available. Primary and secondary cells are discussed, including the major secondary chemistries such as lead acid, nickel cadmium (NiCd), nickel metal hydride (NiMH) and lithium ion (Li-ion). The different types of Li-ion chemistries are investigated, explained and compared against each other as well as other battery technologies. The need for more complex protection circuitry for Li-ion batteries is included in the comparison. Request for quotations are made to battery system manufacturers and evaluated. The result of the research is that the Li-ion NMC energy cell is the best alternative, even if the cost per cell is the most expensive compared to other major technologies. Due to the budget, the LiFeMnPO4 chemistry is used in the realisation of the final system, which is scaled down with consideration to the power requirement.
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Zha, Binbing. „Storage and stimulation of radiation-induced defects in X-ray storage phosphors“. Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/14715.
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In this thesis we present an experimental investigation of the mechanism of storage and stimulation processes in the x-ray storage phosphors BaFBr:Eu and related materials. Such materials are used in radiography and diffraction equipment to image X-rays, but the factors that govern the trapping and release of the image is still unclear. We used photostimulated luminescence (PSL), spontaneous luminescence (SL), and magnetic measurements to study the formation and release of charged defects of a series of pure and doped materials isomorphous with BaFBr. Samples of the materials BaFX (X = Cl, Br, I) and in both a pure form and doped with the rare earth ions La, Ce, Sm, Eu, Gd, Tb, Dy, Tm and Yb were prepared, together with SrFX:Eu (X = Cl, Br, I) and the non-stoichiometric samples BaF1-xBr1+ (x = -0.2, -0.1, 0, 0.1, 0.2) and samples doped with various amounts of oxygen. We also prepared the isomorphous compounds LaOX (X = Cl, Br, I). We designed and built a variable temperature photostimulation and detection system to study the PSL and SL of these materials. The emission spectrum of BaFBr samples doped with most rare earth ions was the same as the pure host material, the exceptions being the dopants Ce, Eu and Yb which showed evidence of transitions involving ions not in the trivalent state. Samples doped with Eu gave the most intense emission spectra due to the correspondence between the energy of recombination of electrons and holes in the host lattice, and the 4f65d - 4f7 transition of Eu2+. Emission spectra of the pure host materials show trends that correspond to trends in trap depths for different lattices.
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Ghashami, Bahman. „A New Power Storage, Cooling Storage, and Water Production Combined Cycle (PCWCC)“. Thesis, Högskolan i Gävle, Energisystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-22725.
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Fresh water shortage and hot weather are common challenges in many countries of the world. In the other hand, the air conditioning systems which are used for indoor cooling cause peak electricity demand during high temperatures hours. This peak hour demand is very important since it is more expensive and mainly is supplied by fossil fuel power plants with lower efficiencies compare to base load fossil fuel or renewable owe plants. Moreover, these peak electricity load fossil fuel power plants cause higher green house gas emission and other environmental effects. So, all these show that any solution for these problems could make life better in those countries and all over the world.In this thesis, a new idea for a Power storage, Cooling storage, and Water production Combined Cycle (PCWCC) is introduced and reviewed. PCWCC is combination of two thermal cycles, Ice Thermal Energy Storage (ITES) and desalination by freezing cycle, which are merged together to make a total solution for fresh water shortage, required cooling, and high peak power demand. ITES is a well known technology for shifting the electricity demand of cooling systems from peak hours to off-peak hours and desalination by freezing is a less known desalination system which is based on the fact that the ice crystals are pure and by freezing raw water and melting resulted ice crystals, pure water will be produced. These two systems have some common processes and equations and this thesis shows that by combining them the resulted PCWCC could be more efficient than each of them. In this thesis, the thermodynamic equations and efficiencies of each PCWCC sub-systems are analyzed and the resulted data are used in finding thermodynamics of PCWCC itself. Also, by using reMIND software, which uses Cplex to find the best combinations of input/output and related processes, the cost of produced fresh water and cooling from PCWCC is compared with total cost of fresh water and cooling produced by each sub-systems of PCWCC in three sample cities all over the world, Kerman, Dubai, and Texas. These cities are chosen since they have similar ambient temperature trend with different electricity and fresh water tariff's. The results show that, the PCWCC is economical where there is a significant electricity price difference between ice charging and ice melting hours, off-peak and peak hours, of the day or when the fresh water price is high compare to electricity price. The results also show that how the revenue from fresh water could cover the used electricity cost and make some income as well.
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Nikolakopoulou, Irene. „Storage, storage facilities and island economy : the evidence from LCI Akrotiri, Thera“. Thesis, University of Bristol, 2002. http://hdl.handle.net/1983/13e8726c-adf7-4e7d-b176-7e109723c0fa.
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Hartnick, Megan Donna. „Evaluation of nuclear spent fuel dry storage casks and storage facility designs“. Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25279.
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Koeberg Nuclear Power Station (KNPS) is the only nuclear power station in Africa and it stores its spent nuclear fuel (SNF) onsite in the spent fuel pool (SFP). Additional aged SNF assemblies are stored in dry storage casks in a facility located on the KNPS site. This minor research dissertation aims at evaluating various dry storage cask found in open literature. The dissertation provides an overview of cask types, heat transfer, radiation shielding and storage facility types. Specific criteria are required in the selection of casks and the storage facility to house the casks on site. The selection criteria for casks and the storage facility were determined and technically evaluated in this dissertation. The selected casks were evaluated in terms of SNF criticality, radiation shielding, decay heat removal and heat transfer. Other aspects also determined by calculation were the seismic stability of casks and the cask footprint. The results obtained show the relationship of the spent fuel (SF) packing density between the different casks. Different shielding materials are used in the casks and it aided the heat transfer process to take place with some casks having additional features which included cooling fins and air vents for adequate cooling of the SNF. Through these some trends could be identified which could be used in the selection or design of new storage casks. Recommendations for further study are to evaluate a greater range of casks to verify and improve upon the relationship of evaluated parameters that were shown in the technical evaluation. These casks should all have similar means of maintaining sub-criticality, shielding and heat removal in order to generate comparable results.
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CASTIGLIA, VINCENZO JUNIOR. „Hybrid Energy Storage Modeling And Innovative Solutions For Energy Storage Management Systems“. Doctoral thesis, Università degli Studi di Palermo, 2022. https://hdl.handle.net/10447/533479.
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La presente tesi riguarda la modellazione di diverse fonti di accumulo di energia elettrica, in particolare batterie e supercondensatori (SC), e di nuove configurazioni di metodi di gestione di sistemi di accumulo di energia ibridi . Il crescente bisogno di domanda di energia e il desiderio di raggiungere uno sviluppo sostenibile, si riflettono nell'uso di Generatori Distribuiti (DG) basati sulle Fonti energetiche Rinnovabili (FER). L'uso di un controllo di supervisione intelligente e il raggruppamento locale della domanda e della generazione possono portare a notevoli miglioramenti nell'efficienza, affidabilità e resilienza del sistema elettrico. Il problema principale della DG basata sulle FER è la variazione naturale di alcune fonti rinnovabili, come il vento e il sole. Per ridurre l'impatto della generazione intermittente delle FER, la soluzione più efficace e pratica è l'impiego di sistemi di stoccaggio dell'energia.The present dissertation concerns about the modeling of different electrical energy storage sources, in particular batteries and supercapacitors (SCs), and of novel configurations of Hybrid Energy Storage Management Systems (HESMS). The growing need for energy demand and the desire to achieve sustainable development, are reflected in the use of Renewable Energy Sources (RESs)-based Distributed Generators (DG). The use of smart supervisory control and local clustering of demand and generation can lead to marked improvements in the efficiency, reliability, and resilience of the electrical system. The main problem of RESs-based DG is the natural variation of some renewable sources, such as wind and solar. To reduce the impact of intermittent RES generation, the most effective and practical solution is the employment of Energy Storage Systems (ESSs).
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Pereira, Antonio M. „Energy-storage multifunctional composites“. Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=2026649971&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Runius, Christian. „Improvements of storage application“. Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-7486.
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Windy Scandinavia is the manufacturer of the luxury yacht Windy 52 Xanthos. There is a storage application in the aft sofa on the boat that doesn’t live up to the standard and functionality level that Windy represents. This report describes the mechanical design process of this storage application, which currently has bad functionality and is expensive for Windy in production.
The aim of the project was to develop the existing storage application to a low cost application. Simple and effective for Windy to produce and assemble, with the directives of access to the front or from above to the sofa.
A feasibility study of the existing application was made to get a picture of disadvantages and advantages to keep for further concepts.
The concept development included three steps; each step implied further development in level of detail. Starting with a range of concepts covering all different possibilities of access to the storage space, and ending up with a couple of concepts developed in detail with costs and knowledge of productions methods.
The result became a standard application; a hatch with gas dampers. The reasons why this became the result was because of the low cost, simplicity and functionality. Small modifications of existing moulds and no new components or production methods needed.
Conclusion of the result is that it fulfils the requirement specification and thereby is a proper result. The conceptual design phase generated many different concepts, from these concepts a result satisfying the requirements emerged.
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Li, Yun. „Natural Gas Storage Valuation“. Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19695.
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In this thesis, one methodology for natural gas storage valuation is developed and two methodologies are improved. Then all of the three methodologies are applied to a storage contract.
The first methodology is called "intrinsic rolling with spot and forward", which takes both the spot and forward prices into account in the valuation. This method is based on the trading strategy by which a trader locks the spot and forward positions by solving an optimization problem based on the market information on the first day. In the following days, the trader can obtain added value by adjusting the positions based on new market information. The storage value is the sum of the first day's value and the added values in the following days.
The problem can be expressed by a Bellman equation and solved recursively. A crucial issue in the implementation is how to compute the expected value in the next period conditioned on the information in current period. One way to compute the expected value is Monte Carlo simulation with ordinary least square regression. However, if all of the state variables, spot, and forward prices are incorporated in the regression there are too many terms, and the regression becomes uncontrollable. To solve this issue, three risk factors are chosen by performing principle component analysis. Dimension of the regression is greatly reduced by only incorporating the three risk factors.
Both the second methodology and the third methodology only consider the spot price in the valuation. The second methodology uses Monte Carlo simulation with ordinary least square regression, which is based on the work of Boogert and Jong (2006). The third methodology uses stochastic dual dynamic programming, which is based on the work of Bringedal (2003). However, both methodologies are improved to incorporate bid and ask prices.
Price models are crucial for the valuation. Forward prices of each month are assumed to follow geometric Brownian motions. Future spot price is also assumed to follow a geometric Brownian motion but for a specific month its expectation is set to the corresponding forward price on the valuation date. Since the simulation of spot and forward prices is separated from the storage optimization, alternative spot and forward models can be used when necessary.
The results show that the value of the storage contract estimated by the first methodology is close to the market value and the value estimated by the Financial Engineering Associates (FEA) provided function. A much higher value is obtained when only spot price is considered, since the high volatility of the spot curve makes frequent position change profitable. However in the reality traders adjust their positions less frequently.
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Zapolskas, Vytautas. „Securing Cloud Storage Service“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18626.
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Cloud computing brought flexibility, scalability, and capital cost savings to the IT industry. As more companies turn to cloud solutions, securing cloud based services becomes increasingly important, because for many organizations, the final barrier to adopting cloud computing is whether it is sufficiently secure.More users rely on cloud storage as it is mainly because cloud storage is available to be used by multiple devices (e.g. smart phones, tablets, notebooks, etc.) at the same time. These services often offer adequate protection to user's private data. However, there were cases where user's private data was accessible to other user's, since this data is stored in a multi-tenant environment. These incidents reduce the trust of cloud storage service providers, hence there is a need to securely migrate data from one cloud storage provider to another.This thesis proposes a design of a service for providing Security as a Service for cloud brokers in a federated cloud. This scheme allows customers to securely migrate from one provider to another. To enable the design of this scheme, possible security and privacy risks of a cloud storage service were analysed and identified. Moreover, in order to successfully protect private data, data protection requirements (for data retention, sanitization, and processing) were analysed. The proposed service scheme utilizes various encryption techniques and also includes identity and key management mechanisms, such as "federated identity management".While our proposed design meets most of the defined security and privacy requirements, it is still unknown how to properly handle data sanitization, to meet data protection requirements, and provide users data recovery capabilities (backups, versioning, etc.).
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Lazzarotto, Alberto. „An innovative ground storage“. Thesis, KTH, Byggnadsteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34845.
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Leenders, Bram. „Heterogeneous Storage in HopsFS“. Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202970.
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In the recent years, the Apache Hadoop distributed file system (HDFS) has become increasingly popular for the storage of large data sets. Both the volume of the data and the variety of applications is unprecedented. The variety of tasks, each with its own access pattern and demands, calls for a file system that supports specialized storages for different tasks. This thesis describes the implementation of heterogeneous storage in HopsFS, a highly-available, highly-scalable version of HDFS. This makes the cluster aware of different storage types (e.g. hard disks and solid state drives) and allows users to specify preferred storage types for their data. By introducing new storage types, we build in support for storage technologies like SSDs and RAID. The latter is especially of interest, since it increases both bandwidth and reliability of the storage on individual nodes while continuing commodity hardware. Since network bandwidth is increasing orders of magnitude faster than disk bandwidth, increasing the disk throughput is of vital importance to avoid local storage becoming a bottleneck. The heterogeneous storage Application Programming Interface (API) described in this thesis offers HDFS administrators more control over their data while being compatible with the HDFS framework. Users can choose whether they want files stored on traditional disks, SSDs or more complex constructions using RAID and erasure coding.
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Ge, Yang. „Printed Charge Storage Capacitor“. Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234123.
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In this thesis, new all-printed capacitors are developed for the applications of energy storage, filter, and resonant circuits by using new dielectric material and an advanced technology. The innovative devices provide satisficing electrical performances with high breakdown voltages and capacitance densities.
The main body of this thesis is divided in three parts. The first part is to introduce the fundamental background of printing technologies, electrical capacitors and printable materials. Among all the printing technologies, direct writing family is the most advantageous in the small-scale and fast production of printed electronics due to the properties of masterless processing, digital control, and print-on-demand. Both inkjet printing and ultrasonic fluid dispensing applied in this work are grouped into the direct writing family. A cross-linkable dielectric material poly(methyl methacrylate)84/(4-benzoylphenyl methacrylate)16 [P(MMA84/BPMA16)] exhibits the optimized chemical and mechanical stabilities in comparison with uncross-linked poly(methyl methacrylate) (PMMA). Poly(vinylidene fluoride-co-trifluoro ethylene) [P(VDF-TrFE)] exhibits a high dielectric constant of 16. The great advantages of both polymeric dielectrics make them ideal for printed electronics. The second part is devoted to the preparation of printed thin-film capacitors by providing four different layouts and architectures for multiple electronic applications. The printing setup, process setting and steps are summarized in detail.
The following part which is the major content of this thesis is divided into two aspects: in the first aspect, the intriguing new form of continuous solution dispensing technology, ultrasonic fluid dispensing, is demonstrated as an alternative printing technology for the commonly applied ones. In comparison with the widely-used inkjet printing, continuous solution dispensing is the most advantageous in thin-film capacitor processing with metal nanoparticle and polymer dielectric inks. It enables precise pattern transfers with low surface roughness, small feature size (as small as 5 μm), and accurate positioning (5 μm resolution).
Most importantly, problems due to discrete droplets and nozzle clogging in inkjet printing are avoided in continuous solution dispensing. All the inks applied for printed capacitors in this work are printed successfully with this innovating technology. Direct printing on demand and rapid switching among different inks are some other attributes of this printing technology that enable high throughput. The second aspect of this part is to characterize and evaluate the fabricated capacitors. The measured values include capacitor dimension, dielectric strength, capacitance density, energy density, charge/discharge behavior and so on.
In summary, this work provides not only the use of the advantageous materials P(MMA84/BPMA16) and P(VDF-TrFE) in high-performance capacitors, but also paves the way of developing thin-film capacitors with a new continuous solution dispensing technology which makes the low-cost and high-quality manufacture of printed devices possible.
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You, Lawrence L. „Efficient archival data storage /“. Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
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Armstrong, Graham. „Nanomaterials for energy storage /“. St Andrews, 2007. http://hdl.handle.net/10023/355.
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Edberg, Robin, und Magnus Qvint. „Article Placement in Storage“. Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91311.
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Beijer Byggmaterial är ett företag med förbättringspotential angående lagerhantering. Eftersom lager och service är centralt i företagets syfte kan lönsamhet uppnås vid effektiviserad lagerhantering. Syftet med rapporten har varit att minska tiden för plockning av artiklar ur ett kundperspektiv på Beijer Byggmaterials lager i Halmstad. Utifrån detta har ett antal frågeställningar diskuterats fram som i denna rapport ska svara på ifall det är lönsamt för företaget att frekvenslägga sina artiklar. Arbetsgången har skett genom tre olika steg, där den första fasen behandlade insamling av data. Detta följdes upp av diverse beräkningar och analyser angående artikelplacering i lager. Sista fasen behandlade det lösningsförslag som författarna arbetat fram. I dagsläget är artiklarna på Beijer placerade i artikelgrupper utan frekvensläggning. I det lösningsförslag som arbetets fram i denna rapport visar det sig lönsamt för företaget att placera ut artiklarna baserat på dess frekvens. Detta har genomförts genom ett antal olika ABC-analyser med ett antal kriterier där de artiklar med högst plockfrekvens klassificeras som A-artiklar och har därför placerats på en lämplig plats. Genom stöd från teorier har frekvensläggning och artikelplacering resulterat i kortare plocktider för både kunder och personal samt en högre kundservice genom hela lagret.Beijer Byggmaterial is a company with potential for improvement regarding inventory management. Since stockks and customer service are central to the company’s purpose, profitability can be achieved in more efficient inventory management. The purpose of the report has been to reduce the time for picking items from a customer perspective in one of Beijer Byggmaterial’s warehouses. On this basis, a number of issues discussed were that this report will answer if it’s profitable for the company to overlook an article placement of its products. The procedure was done through three different stages, the first phase dealt with the collection of data. This was followed by various calculations and analyzes regarding article placement of stock. The last phase is considered the solution proposed by the authors. In the current situation, articles at Beijer are placed in different groups without being based on frequency. The proposed solutions in this report show that it’s profitable for the company to place articles based on frequency. This has been implemented by a number of ABCanalyzes with a number of criteria which the articles with the highest frequency being classified as A-items and are therefore placed in a suitable location. Through the support of theories frequency orientation and article placement have resulted in shorter retrieval times for both customers and staff, and a higher customer service thought the warehouse.
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Lim, Sanggyu. „Zoning in storage systems“. Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/24365.
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Sikalinda, Paul. „Analyzing Storage System Workloads“. Thesis, University of Cape Town, 2006. http://pubs.cs.uct.ac.za/archive/00000410/.
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Analysis of storage system workloads is important for a number of reasons. The analysis might be performed to understand the usage patterns of existing storage systems. It is very important for the architects to understand the usage patterns when designing and developing a new, or improving upon the existing design of a storage system. It is also important for a system administrator to understand the usage patterns when configuring and tuning a storage system. The analysis might also be performed to determine the relationship between any two given workloads. Before a decision is taken to pool storage resources to increase the throughput, there is need to establish whether the different workloads involved are correlated or not. Furthermore, the analysis of storage system workloads can be done to monitor the usage and to understand the storage requirements and behavior of system and application software. Another very important reason for analyzing storage system workloads, is the need to come up with correct workload models for storage system evaluation. For the evaluation, based on simulations or otherwise, to be reliable, one has to analyze, understand and correctly model the workloads.
In our work we have developed a general tool, called ESSWA (Enterprize Storage System Workload Analyzer) for analyzing storage system workloads, which has a number of advantages over other storage system workload analyzers described in literature. Given a storage system workload in the form of an I/O trace file containing data for the workload parameters, ESSWA gives statistics of the data. From the statistics one can derive mathematical models in the form of probability distribution functions for the workload parameters. The statistics and mathematical models describe only the particular workload for which they are produced. This is because storage system workload characteristics are sensitive to the file system and buffer pool design and implementation, so that the results of any analysis are less broadly applicable. We experimented with ESSWA by analyzing storage system workloads represented by three sets of I/O traces at our disposal.
Our results, among other things show that: I/O request sizes are influenced by the operating system in use; the start addresses of I/O requests are somewhat influenced by the application; and the exponential probability density function, which is often used in simulation of storage systems to generate inter-arrival times of I/O requests, is not the best model for that purpose in the workloads that we analyzed. We found the Weibull, lognormal and beta probability density functions to be better models.
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Jiao, Feng. „Nanomaterials for energy storage“. Thesis, University of St Andrews, 2008. http://hdl.handle.net/10023/487.
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The results presented in this thesis demonstrate the first synthesis of several nanostructured transition metal oxides and lithium containing transition metal oxides. Their uses in lithium-ion batteries and/or as magnetic materials have been investigated. The first example of two and three dimensional mesoporous Fe₂O₃ has been prepared by using the soft templating (surfactant) method. The materials have amorphous walls and exhibit superparamagnetic behaviour. By using a hard template route, a mesoporous α-Fe₂O₃ with highly crystalline walls has been synthesized. Its unique magnetic behaviour, distinct from bulk α-Fe₂O₃, nanoparticulate α-Fe₂O₃, and mesoporous Fe₂O₃ with disordered walls, has been demonstrated. The hard template method was also used to prepare nanowire and mesoporous Co₃O₄, β-MnO₂ and MnO₃ with crystalline walls. Their electrochemical properties as electrodes in Li-ion batteries have been investigated. Mesoporous β-MnO₂ can accommodate 0.9 Li/Mn in stark contrast to bulk β-MnO₂ which cannot accommodate Li. To prepare mesoporous materials which cannot be obtained directly by the hard template method, a post-templating route has been developed. Mesoporous Fe₃O₄, γ-Fe₂O₃, and Mn3O4 with ordered mesostructures and highly crystalline walls have been obtained by post-synthesis reduction/oxidation treatments. All the materials show unique magnetic properties compared with nanoparticulate and bulk materials. Also, the first example of lithium containing mesoporous material, LT-LiCoO₂, was synthesized by first preparing mesoporous Co₃O₄, then reacting this with LiOH to form LT-LiCoO₂, with retention of the ordered nanostructure. The nanostructured LT-LiCoO₂ compounds demonstrate superior performance compared with normal or nanoparticulate LT-LiCoO₂, when used as intercalation electrodes in lithium batteries. Finally, monodispersed Mn₃O₄ nanoparticles (diameter ~ 8 nm) with a core-shell structure (a highly crystalline Mn₃O₄ core encased in a thin MnO₂ shell) have been prepared for the first time. Ordered three-dimensional arrays form by spontaneous self-assembly. Magnetic measurements demonstrated that the self-assembled three-dimensional arrays exhibit spin-glass behaviour, rather than the anticipated superparamagnetic behaviour for isolated nanoparticles. Such behaviour is interpreted as arising from strong interactions between the core (crystallized Mn₃O₄) and shell (MnO₂).
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El-Gorashi, Taisir El-Mustafa Hamza. „Optical storage area networks“. Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522930.
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Wang, Xing. „Benchmarking Cloud Storage Systems“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26716.
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With the rise of cloud computing, many cloud storage systems like Dropbox, Google Drive and Mega have been built to provide decentralized and reliable file storage. It is thus of prime importance to know their features, performance, and the best way to make use of them. In this context, we introduce BenchCloud, a tool designed as part of this thesis to conveniently and efficiently benchmark any cloud storage system.First, we provide a study of six commonly-used cloud storage systems to identify different types of their features. Then existing benchmarking tools for cloud systems are presented, and the requirements, design goals and internal architecture of BenchCloud are studied. Finally, we show how to use BenchCloud to analysis cloud storage systems and take a series of experiments on Dropbox to show how BenchCloud can be used to benchmark and inspect various kinds of features of cloud storage systems.
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Dutton, Richard John. „Modelling transient storage processes“. Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419618.
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Entwistle, Tina Gail. „Synthesis of storage starch“. Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316826.
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Paul, Greig. „Secure decentralised storage networks“. Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28763.
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In recent years, cloud-based computing and storage have become increasingly popular,as they remove the need for users and developers to buy or rent expensive dedicated hardware on an ongoing basis. This has led to the increasing centralisation of both services and storage, where users are reliant upon a small number of cloud-based providers to hold their data, and provide them with services they use. Recent events have shown that security breaches of centralised data stores can lead to significant quantities of personal data being revealed. This centralisation can also result in inconvenience in the event of the failure of the service provider, resulting in potential data loss or a loss of utility of the service. In contrast, a decentralised service and storage architecture removes the single point of failure from a network, and allows users to remove their dependency on a single company or service provider. In addition, by preventing storage providers from having access to user data, as is inherently needed in a decentralised network to preserve confidentiality,it is possible for users to protect their data from theft or unauthorised access,giving rise to data security and privacy benefits. This thesis explores the the challenges encountered in implementing a secure decentralised network, based around storage, and presents solutions to some of these problems. A security analysis of the MaidSafe network is firstly given, setting the context of the work, and investigating the state-of-the-art. Potential uses for decentralised services are considered, including for use on mobile devices. The importance of client device security is also considered, and a number of vulnerabilities affecting the security of client-based software are identified and explored. A practical design of decentralised architecture for preserving user privacy when discovering users is also contributed, to illustrate how decentralised service design can be used to enhance privacy of existing systems, and solve otherwise unsolved problems. A review and analysis of the privacy policies of popular web-based services then shows the extent to which user privacy is at risk from centralised web services. Finally, the concepts of identity and authentication within decentralised networks are considered, with a novel smartcard-based approach to securing user credentials within a decentralised network demonstrated.
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Strauss, Jacob A. (Jacob Alo) 1979. „Device-transparent personal storage“. Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62459.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 83-87).
Users increasingly store data collections such as digital photographs on multiple personal devices, each of which typically presents the user with a storage management interface isolated from the contents of all other devices. The result is that collections easily become disorganized and drift out of sync. This thesis presents Eyo, a novel personal storage system that provides device transparency: a user can think in terms of "file X", rather than "file X on device Y", and will see the same set of files on all personal devices. Eyo allows a user to view and manage the entire collection of objects from any of their devices, even from disconnected devices and devices with too little storage to hold all the object content. Eyo separates metadata (application-specific attributes of objects) from the content of objects, allowing even storage-limited devices to store all metadata and thus provide device transparency. Fully replicated metadata allows any set of Eyo devices to efficiently synchronize updates. Applications can specify flexible placement rules to guide Eyo's partial replication of object contents across devices. Eyo's application interface provides first-class access to object version history. If multiple disconnected devices update an object concurrently, Eyo preserves each resulting divergent version of that object. Applications can then examine the history and either coalesce the conflicting versions without user direction, or incorporate these versions naturally into their existing user interfaces. Experiments using Eyo for storage in several example applications-media players, a photo editor, podcast manager, and an email interface-show that device transparency can be had with minor application changes, and within the storage and bandwidth capabilities of typical portable devices.
by Jacob Alo Strauss.
Ph.D.
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Falk, Matthew D. „Cryptographic cloud storage framework“. Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85417.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (page 59).
The cloud prevents cheap and convenient ways to create shared remote repositories. One concern when creating systems that provide security is if the system will be able to remain secure when new attacks are developed. As tools and techniques for breaking security systems advance, new ideas are required to provide the security guarantees that may have been exploited. This project presents a framework which can handle the ever growing need for new security defenses. This thesis describes the Key Derivation Module that I have constructed, including many new Key Derivation Functions, that is used in our system.
by Matthew D. Falk.
M. Eng.
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Smith, Becky Lou. „Fulfillment center storage optimization“. Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117948.
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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2018.Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, in conjunction with the Leaders for Global Operations Program at MIT, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 105-109).
Warehouses and fulfillment centers have traditionally been designed to handle bulk orders of pallet and cases. The growth in e-commerce is demanding operational improvements for efficient storage of large selections and the ability to quickly pick, fill, pack and ship single items and small orders. Online grocery fulfillment presents a new gamut of challenges due to the unique storage and handling requirements of grocery products. As demand increases, storage space can quickly become a performance-limiting constraint. Operations managers must find creative ways to fit more products into the same amount of space, while maintaining or increasing throughput to meet the increased demand and efficiency targets. This thesis proposes that an optimum fulfillment center storage system can be achieved by strategically balancing trade-offs between labor productivity and space utilization and by minimizing the impacts of variation. This document evaluates the relationships between these trade-offs and highlights five guiding principles of great storage systems for high-rate fulfillment centers. Amazon Fresh will serve as a case-study to provide a real-world complex application for testing the claims presented in this thesis. Research findings and the five guiding principles are are used to develop data-supported recommendations to address storage-related challenges at Amazon Fresh fulfillment centers. The insights from this research can be used to improve storage capacity and efficiency with a well-balanced storage system.
by Becky Lou Smith.
M.B.A.
S.M.
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Armstrong, Graham M. „Nanomaterials for energy storage“. Thesis, University of St Andrews, 2007. http://hdl.handle.net/10023/355.
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Nanotubes (inner diameter of 8nm and outer diameter of 10nm with a length of up to several hundred nm) and nanowires (diameter 20 – 50nm and up to several μm in length) of TiO₂-B have been synthesised and characterised for the first time. These exhibit excellent properties as a host for lithium intercalation and are able to accommodate lithium up to a composition of Li₀.₉₈TiO₂-B for the nanotubes and Li₀.₈₉TiO₂-B for the nanowires. Following some irreversible capacity on the first cycle, which could be reduced to 4% for the nanowires, capacity retention for the nanowires is 99.9% and for the nanotubes is 99.5% per cycle. In both cases, the cycling occurs at ~1.6V versus lithium. The cycling performance was compared with other forms of bulk and nano-TiO₂, all of which were able to intercalate less lithium. Nanowires of VO₂-B (50 – 100nm in diameter and up to several μm in length) were synthesised by a hydrothermal reaction and characterised. By reducing the pressure inside the hydrothermal bomb, narrower VO₂-B nanowires with a diameter of 2 – 5nm and length of up to several hundred nm were created - some of the narrowest nanowires ever made by a hydrothermal reaction. These materials are isostructural with TiO₂-B and were also found to perform well in rechargeable lithium ion batteries, being able to intercalate 0.84Li for the ultra-thin nanowires and 0.57Li for the standard nanowires. The standard VO₂-B nanowires have a capacity retention of 99.8% and the ultra-thin nanowires have 98.4% per cycle after some irreversible capacity on the first cycle. This was found to improve markedly when different electrolytes were used. Macroporous Co₃O₄ (pore size 400nm with a surface area of 208m²/g) was prepared and cycled in rechargeable lithium cells with capacities of 1500mAh/g being achieved. The structure was found to break down on the first cycle and after this the material behaved in the manner of Co₃O₄ nanoparticles. Finally a new candidate for next generation rechargeable lithium batteries was examined; Li/O₂ cells. The cathode is composed of porous carbon in which Li⁺, e⁻ and O₂ meet to form Li₂O₂ on discharge. The reaction is reversible on charge. Capacities of 2800mAh/g can be achieved when 5%mole of αMnO₂ nanowires catalyst is used. Fade is high at 3.4% per cycle meaning that there is much work to do to develop these into a commercial prospect.
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Fransson, John. „External storage for SUVs“. Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189491.
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Examensarbetet är utfört under våren 2016 tillsammans med företaget 56 Nord som tillverkar och säljer takboxar. De är i nuläget i uppstarts-fasen och och deras produkt är nischad till en väldigt speciell målgrupp. Takboxen som de tillverkar, innehar väldigt förmånliga egenskaper gällande luftmotstånd, vikt och kvalité. Vilket gör de till en väldigt speciellt produkt jämfört med vad som existerar. I huvudsak var målet med detta arbete att ifrågasätta de nuvarande lösningarna kring externt förvaringsutrymme och att ta fram ett slutkoncept som passar för 56 Nord. Under arbetets gång undersöktes endast SUV:ar på grund av att problemformulering blev tydligare med dessa. Arbetet är uppdelat i sju stycken olika avsnitt som kan delas in i fyra stycken olika faser, och i varje fas innehåller en mängd kvalitativa metoder för att analysera problem. Den första fasen är en förstudie innehållandes informationsinsamling & problemidentifikationen. Den andra är konceptframtagningsprocessen med konceptgenerering, -eliminering, -utvärdering för att sedan välja koncept i den tredje fasen som är urval av koncepten. I fjärde och sista fasen, slutkoncept, realiseras och verifieras konceptet gentemot kravspecifikationen. Efter att förstudien var klar, togs kontakt en första kontakt med 56 Nord för att presentera idéen kring arbetet och inleda ett samarbete. I förstudien erhölls det information om tydliga brister om befintliga produkter. Problematiken kring dessa bröts ner, analyserade och detta möjliggjorde att koncepten som framtogs kunde lösa vissa av de befintliga problem som fanns. Genom produktframtagningsprocessen kunde detta göras om i omgångar för att förbättra koncepterna och tillslut kunde tre stycken olika koncept presenteras för 56 Nord. Slutkonceptet som utsågs var inte det konceptet som erhölls de högsta resultaten, utan de var de konceptet som föll i 56 Nords riktlinje med avseende på målgrupp och värdeord. Efter samtal med 56 Nord sattes nya krav och förväntningar på slutkonceptet som till slut kunde levereras där båda parter var nöjda. 56 Nord säger att slutkonceptet skulle utgöra ett bra komplement för de som har en SUV och som inte vill ha en släpvagn bakom sig. Detta är en produkt som är perfekt för den som vill kunna köra fort, behöver extra utrymme och vill samtidig att inte bilen ska förbruka ännu mer bränsle eller ge ifrån sig extra ljud.This thesis is formed under the spring of 2016 along with now 56 North, which produces and sells roof boxes. They are currently in the start-up phase and their product is for a very specific audience. The roof box they produce, possess very favourable properties regarding wind resistance, weight and quality. Which makes them a very special product compared with what exists in the market today. The goal of this work is to question the current solutions around “the external storage space” outside the car and to develop a final concept that fits for 56 North demands. Limit for the work were taken, only SUVs were analysed because the problem became more defined for these cars. The work is divided into seven different sections and can be divided into four different phases; each phase contains a variety of qualitative methods to analyse problems. The first phase is a feasibility study, the information gathering and problem identification. The second phase is the concept-development process of generating concepts, elimination, evaluation and then choose three concepts. The third phase is the selection of concepts happens. In the fourth and final phase, the final concept, develops thru different steps. After the feasibility study was completed, contact was made with 56 North to present the idea about the work and to initiate cooperation. The preliminary study obtained the information about the obvious shortcomings of existing products. The problems of these products were broken down, analysed and this enabled that the concepts that was developed, could solve some of the existing problems that existed. Through the product development process, the concepts were improved many times, and finally able to become three different concepts that was presented for 56 North. The final concept that was chosen by 56 Nord, was not the concept which obtained the highest results, but was the concept that fell in 56 North's approach because of the company’s core values. After discussions with the 56 North, there were some new demands and expectations of the final concept, that eventually could be delivered where both parties were satisfied. 56 North says the final concept would be a great addition for those who have an SUV and who do not want a trailer behind them. This is a great product for those who wants to drive fast and want extra space; but at the same time does not want the car to consume more fuel or become noisier than normal.
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Wagner, Christopher. „Comparative grain storage analysis“. Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/35752.
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Master of AgribusinessDepartment of Agricultural Economics
Brian C. Briggeman
Grain Elevators have towered the plains of Southwest Kansas for over the last half of a century. Many of these large white concrete structures were built during the 1950s using a slip form concrete design. While new grain storage has been built over time, many of the original slip form structures remain a large part of the farm cooperatives storage capacity. Grain production has continued to increase and put greater demand on storage facilities and handling capabilities. Thus, there is a need for cooperatives to meet the future demands of farmers by replacing or updating grain storage assets. The objective of this project is to provide a comparative analysis of grain storage options that a cooperative, primarily the Garden City Co-op, Inc. (GCC), could utilize in making a decision to update or replace grain storage assets. The project examines three different options for grain storage including concrete, steel, and bunker storage. The project will also examine extending the life of an original slip form elevator by installing a gunite bin liner. To determine which option that provides the most economic benefit to GCC and its members, Net Present Value and the Internal Rate of Return are estimated for each grain storage option. GCC historical grain handling margins and grain storage costs were derived from historical averages and bids from projects GCC has undertaken in the past five years, respectively. The model assumes receipts as a percentage of storage to accurately represent bushels handled by a facility. Grain storage is highly variable in initial cost and the operational needs will change in every circumstance. The results indicate that a large volume of grain is needed before economic profits will be realized.