Nowadays, the application of information technology worldwide is accelerating the digital transformation of the healthcare sector. Incorporating blockchain technology into healthcare provides better and more innovativ...
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Alzheimer's disease (AD) is a common chronic ailment that predominantly affects elderly people. AD is a neurological condition that causes a steady deterioration in cognitive function. There is no cure for AD;howe...
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Due to its core characteristics, blockchain research has gained attention (Alrubei et al, in Ethereum blockchain for securing the Internet of Things: practical implementation and performance evaluation. IEEE, 2019 [1]...
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AI-driven dual-model system for brain tumor detection in MRI scans, combining classification and segmentation techniques. A ResNet50-based convolutional neural network (CNN) identifies the presence of tumors, while a ...
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We study the worst-case time complexity of solving two agreement problems, consensus and broadcast, in systems with n processes subject to no more than t process failures. In both problems, correct processes must deci...
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ISBN:
(纸本)9783959773089
We study the worst-case time complexity of solving two agreement problems, consensus and broadcast, in systems with n processes subject to no more than t process failures. In both problems, correct processes must decide on a common value;in the consensus problem, each process has an input and if the inputs of correct processes are all the same, then that must be the common decision, whereas in the broadcast problem, only one process (the sender) has an input and if the sender is correct, then its input must be the common decision. We focus on systems where there is an upper bound ∆ on the message delivery time but it is expected that typically, messages arrive much faster, say within some time d. While ∆ may or may not be known in advance, d is inherently unknown and specific to each execution. The goal is to design deterministic algorithms whose running times have minimal to no dependence on ∆, a property called responsiveness. We present a generic algorithm transformation that, when applied to appropriate eventually-synchronous consensus (or broadcast) algorithms, results in consensus (or broadcast) algorithms for send omission failures, authenticated Byzantine failures, and unauthenticated Byzantine failures whose running times have no dependence on ∆;their worst-case time complexities are all O(td), which is asymptotically optimal. The algorithm for send omission failures requires n > 2t, while those for Byzantine failures, both authenticated and unauthenticated, require n > 3t. The failure-resilience of the unauthenticated Byzantine algorithm is optimal. For authenticated Byzantine failures, existing agreement algorithms provide worst-case time complexity O(t∆) when n is at most 3t. (When n ≤ 2t, broadcast is solvable while consensus is not.) We prove a lower bound on the worst-case time complexity of ⌊(3t − n)/2⌋ d + ∆ when n is at most 3t. Although lower bounds of ∆ and (t + 1)d were already known, our new lower bound indicates that, at least when n ≤ 2t, it
Plant diseases cause substantial losses in crop production, which exerts a major impact on the economic development of agriculture. Early detection of these diseases is inevitable to prevent significant production los...
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Cripples are those who cannot move and can not do their work by themselves, it is necessary to look after them for their emergency need. Due to lack of manpower in hospitals, an attendant can not stay with the patient...
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In today's world, programming has become a very essential skill as it is used everywhere, from creating software's for operating systems to analysis of patients' health care data in biomedical engineering....
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Birds are vertebrate animals that are adapted for flight due to the presence of hollow bone structures. The entire population of birds contributes 0.08 % to the total animal biomass. In the past two decades, there has...
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Lung cancer stands as a significant global health challenge, demanding advancements in early detection methods to enhance patient outcomes. The research attempts to create accurate diagnostic tools by examining a vari...
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