Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 142 for “"Replicas"”.
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Propagation of updates to replicas using error-correcting codes
With the increase in percentage of replicas of data in the Internet, reducing the amount of bandwidth needed for propagation of updates across the replicas has become a major issue. Objective of our investigation is to design an update propagation mechanism focused on reducing the amount of …
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Hydrothermal conversion of diatom frustules into barium titanate based replicas
… frustules were converted to titanium dioxide replicas using method previously devised by our group. The titanium dioxide replicas were subjected to a hydrothermal reaction by exposing the replicas to an aqueous basic solution containing barium hydroxide to form barium titanate and barium …
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Towards Accurate and Reliable Industrial Intrusion Detection Systems Using Shadow Replicas
Supervisory Control and Data Acquisition (SCADA) systems manage the operations of a plethora of safety-critical industrial control systems. Due to their sensitive nature, SCADA systems have been the target of adversaries employing a wide range of attacks. This thesis proposes an approach to protect …
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Efficient Message Logging to Support Process Replicas in a Volunteer Computing Environment
… data objects must be logged to ensure the replicas of a logical process receive identical communication data streams. Logging to support redundancy can be the source of a significant overhead in time and storage. In this thesis we develop, implement and evaluate and compare pessimistic and …
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Knock-offs, fakes, replicas, and reals : a cultural supply chain of counterfeit fashion
This thesis attempts to uncover the emotional and cultural economics of material culture. What does it mean for material good to be "fake"? What are the salient aspects that are being copied and are those aspects purely material? How does counterfeit branded fashion function as craft, as commodity, …
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Detecting and tolerating Byzantine faults in database systems
… answers from queries and updates on multiple replicas which are off-the-shelf database systems, to provide a single database that is Byzantine fault tolerant. The scheme works when the replicas are homogeneous, but it also allows heterogeneous replication in which replicas come from different …
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Soft Mobility Techniques For Ensuring Network Availability
… common practice is to set up multiple static replicas of the data. Static replicas are commonly placed at different locations on the Internet so that users can access the data easily and quickly. However a determined attacker can shutdown the system by carrying out targeted DoS attacks. We …
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Distributed query execution on a replicated and partitioned database
… ways, developers must manually select different replicas in their application code. This work presents Dixie, a query planner and executor which automatically executes queries over replicas of partitioned data stored in a set of relational databases, and optimizes for high throughput. The …
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Partial Replica Location And Selection For Spatial Datasets
… The implementation of partial or incomplete replicas, which represent only a subset of a larger dataset, has been an active topic of research. Partial Spatial Replicas extend this functionality to spatial data, allowing us to distribute a spatial dataset in pieces over several locations. We …
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HQ replication
… e.g., BFT, that uses communication between replicas to agree on a proposed ordering of requests, and a quorum-based approach, such as Q/U, in which clients contact replicas directly to optimistically execute operations. Both approaches have shortcomings: the quadratic message cost of …
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Storing and managing data in a distributed hash table
… replica maintenance must create additional replicas when failures are detected. However, creating replicas after every failure stresses network and storage resources unnecessarily. Tracking the location of every replica of every object would allow a replica maintenance algorithm to create …
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Towards Fast and Adaptive Byzantine State Machine Replication for Planetary-Scale Systems
… are made about the behavior of faulty replicas. With the advancement of distributed ledger technologies (DLT), planetary-scale BFT SMR ist becoming practical and necessary as it can serve as a consensus primitive to keep the ledger consistent. In our view, the alignment of BFT SMR to …
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Fast in-memory storage systems : two aspects
… can recover from simultaneous crashes of all the replicas as long as a majority revive with intact disks. The main idea is to acknowledge requests after recording them in memory, and to write updates to disk in the background, allowing large batched writes and thus good performance. A simultaneous …
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Passive Categorisation Training for Tinnitus Management
… Pilot study (n=22): Evaluated eight tinnitus replicas based on their emotional affect and ability to replicate participant’s tinnitus. Effortless auditory categorisation study (n=29): Compared the effects of an effortless auditory categorisation training (CT) paradigm to conventional white …
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Parsimonious Service Replication for Tolerating Malicious Attacks in Asynchronous Environments
… machine replication, state consistency among the replicas of a service is maintained by first agreeing on the order of requests to be processed (agreement or atomic broadcast phase) and then executing the requests in the agreed-upon order (execution phase). We propose a methodology for …
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Partitioning social networks for data locality on a memory budget
… locality for social network queries by placing replicas of user data. We show that exploiting temporal characteristics of user behavior can enable effective partitioning for data locality without replication. We then build on this concept and demonstrate improved data locality by placing …
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Feasibility study into the use of digital image correlation for creep strain monitoring of fossil power plant welds
… quantified by way of Metallographic Replication (replicas). This is a quasi NonDestructive Examination (NDE) technique that looks at the microstructure of the sample in question. Although well-known and used extensively, replicas, as with any technology, have their shortcomings. Extracting of …
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Heuristic Algorithms for Adaptive Resource Management of Periodic Tasks in Soft Real-Time Distributed Systems
… algorithms that determine the number of subtask replicas that are required for adapting the application to a given workload situation using statistical regression theory. The algorithms use regression equations that forecast subtask timeliness as a function of external load parameters such as …
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Authentication in a reconfigurable Byzantine fault tolerant system
… replica servers and as more than a third of the replicas are non-faulty, the group as a whole continues to behave correctly. We would like the service to be able to authenticate data. Authenticated data is data that more than a third of the service is willing to sign. If a long-lived replicated …
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AQuA: A Framework for Providing Adaptive Fault Tolerance to Distributed Applications
… replication schemes, with different numbers of replicas and various message lengths. In addition, fault detection and recovery times with different replication schemes under various failure situations were studied.
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