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نتیجه جستجو - Fault Tolerance

تعداد مقالات یافته شده: 17
ردیف عنوان نوع
1 Privacy-preserving aggregation for cooperative spectrum sensing
تجمیع حفظ حریم خصوصی برای سنجش طیف تعاونی-2019
Cognitive radio technology has been proposed as a promising way to alleviate spectrum scarcity. In cognitive radio networks, cooperative spectrum sensing is an effective approach to improve spectrum-estimation accuracy. In this approach, a fusion center (FC) outsources sensing tasks to secondary users (SUs), and aggregates sensing reports provided by SUs to estimate spectrum availability. However, as sensing reports are highly correlated to SUs’ real locations, revealing sensing reports to an untrusted FC may incur a serious privacy threat for SUs. In this paper, we propose an efficient scheme that allows the FC to learn desired statistics from a group of SUs without compromising individual privacy. Moreover, the FC is still able to compute the sum over the remaining SUs when some SUs fail to submit their reports. Besides, to ensure secure communication in cooperative spectrum sensing, the proposed scheme verifies the legitimacy of SUs by utilizing the elliptic curve cryptography technique. The results of security analysis show that the proposed scheme achieves the combined objectives of privacy preservation, authentication, fault tolerance, and resistance to various types of attacks. Performance evaluation results demonstrate the feasibility and practicality of the proposed scheme.
Keywords: Cognitive radio networks | Cooperative spectrum sensing | Privacy preservation | Authentication | Fault tolerance | Elliptic curve cryptography
مقاله انگلیسی
2 Implementing healthcare services on a large scale: Challenges and reme dies based on blockchain technology
اجرای خدمات مراقبت های بهداشتی در مقیاس گسترده: چالش ها و مرگ و میرها براساس فناوری بلاکچین -2019
The accessibility of electronic healthcare data is necessary for effective treatment, policy decisions, and healthcare information exchange. Due to the intangibility of digital data, healthcare information is also prone to privacy-breach and security attacks. Further, the importance of immutability and privacy of healthcare data becomes colossal when a nationwide healthcare and wellness scheme is planned to be implemented. Providing quality healthcare services to such an enormous population size is challenging and requires proper technological infrastructure. The cooperation from the society is equally important to lay such a copious architecture on which the healthcare services should seamlessly run. Objective: To assess the social and technical challenges that lie ahead in implementing large-scale com- prehensive healthcare services and suggest a technology-intervening solution to serve the society at large. Method: This study considers India’s National Health Policy (2017) initiatives. The social and technical hurdles in implementation of the schemes are discussed, and AarogyaChain, a Blockchain technology- based solution is proposed to eliminate the health policy implementation hiccups. Result: We find that the scalability is a primary concern in implementing healthcare services on blockchain at such a large scale. We experimented by creating a blockchain and found that the system throughput is a function of the number of special nodes called ordering nodes, and a trade-offis required to balance between time-to-commit and system’s fault tolerance. Conclusion: Blockchain provides a secure and transparent system of integrated healthcare services that keeps patients at the center and provides for corruption intolerant and efficient implementation of na- tionwide health-insurance programs.
Keywords: Blockchain | EHR | Health policy | Decentralized computing | Corruption intolerance | Health insurance | Hyper ledger fabric
مقاله انگلیسی
3 Analysis of the main consensus protocols of blockchain
تجزیه و تحلیل پروتکل های اجماع اصلی بلاکچین-2019
Blockchain is the core technology of many cryptocurrencies. Blockchain as a distributed ledger technology has received extensive research attention. In addition to cryptography and P2P (peer-to-peer) technology, consensus protocols are also a fundamental part of the blockchain technology. A good consensus protocol can guarantee the fault tolerance and security of the blockchain systems. The consensus protocols currently used in most blockchain systems can be broadly divided into two categories: the probabilistic-finality consensus protocols and the absolute-finality consensus protocols. This paper introduces some of the main consensus protocols of these two categories, and analyzes their strengths and weaknesses as well as the applicable blockchain types.
Keywords: Blockchains | Consensus protocols | Cryptocurrencies
مقاله انگلیسی
4 A multi-factor monitoring fault tolerance model based on a GPU cluster for big data processing
مدل تحمل نظارت بر گسل چند عامل بر اساس یک خوشه GPU برای پردازش داده های بزرگ-2018
High-performance computing clusters are widely used in large-scale data mining applica tions, and have higher requirements for persistence, stability and real-time use and sre therefore computationally intensive. To support large-scale data processing, we design a multi-factor real-time monitoring fault tolerance (MRMFT) model based on a GPU clus ter. However, the higher clock frequency of GPU chips results in excessively high energy consumption in computing systems. Moreover, the ability to support a long-lasting high temperature operation varies greatly between different GPUs owing to the individual dif ferences between the chips. In this paper, we design a GPU cluster energy consumption monitoring system based on wireless sensor networks (WSNs) and propose an energy con sumption aware checkpointing (ECAC) for high energy consumption problems with the following two advantages: the system sets checkpoints according to actual energy con sumption and the device temperature to improve the utilization of checkpoints and re duce time cost; and it exploits the parallel computing features of CPU and GPU to hide the CPU detection overhead in GPU parallel computation, and further reduce the time and energy consumption overhead in the fault tolerance phase. Using ECAC as the constraint and aiming for a persistent and reliable operation, the dynamic task migration mechanism is designed, and the reliability of the cluster is greatly improved. The theoretical analysis and experiment results show that the model improves the persistence and stability of the computing system while reducing checkpoint overhead.
Keywords: Big data processing ، GPU cluster ، Persistence computing ، Energy consumption ، Fault tolerance ، Energy consumption aware heckpointing ، Task migration
مقاله انگلیسی
5 اطمینان پذیری ارکستریتور مجازی سازی توابع شبکه (NFV): وضعیت چالش ‌های تحقیق و مرور
سال انتشار: 2018 - تعداد صفحات فایل pdf انگلیسی: 23 - تعداد صفحات فایل doc فارسی: 78
معرفی مجازی سازی توابع شبکه (‏NFV)‏ یک تغییر قابل‌توجه در فن‌آوری شبکه را نشان می‌دهد، که ممکن است فرصت‌های جدیدی را از نظر بهره‌وری هزینه، عملیات، و تامین خدمات ایجاد کند. اگر چه به طور صریح به عنوان یک هدف بیان نشده است، قابلیت اطمینان خدمات ارائه‌ شده با استفاده از این فن‌آوری باید حداقل به خوبی راه‌حل‌های مرسوم باشد. تمرکز منطقی، پلتفرم‌های محاسباتی خارج از قفسه، و پیچیدگی افزایش ‌یافته سیستم نشان‌ دهنده چالش‌های قابلیت اطمینان جدید نسبت به حالت هنر است. عملکرد اصلی شبکه، با توجه به شکست و مدیریت خدمات، ارکستراسیون است. شکست و سو استفاده از ارکستریتور NFV (‏NFVO)‏ پیامدهای شبکه گسترده‌ای خواهد داشت در عین حال، NFVO نسبت به خطاهای بیش از حد و طراحی آسیب‌پذیر است.
بنابراین، هدف این مقاله آموزش چالش‌های قابلیت اطمینان NFVO و ارائه بینش به تحقیقات آینده مورد نیاز است. این مقاله اطلاعات پیش‌زمینه لازم را فراهم می‌کند، متون موجود را مرور می‌کند، راه‌حل‌های پیشنهادی را مشخص می‌کند، و برخی از مشکلات طراحی و تحقیقاتی که باید مورد توجه قرار گیرند را شناسایی می‌کند.
کلمات کلیدی - مجازی سازی توابع شبکه (NFV): ارائه ‌دهنده یا ارکستریتور NFV | مدیریت و تنظیم چهارچوب معماری مجازی توابع شبکه (NFV MANO) | تلورانس یا تحمل خطا | انعطاف‌پذیری MANO | اطمینان پذیری NFV | قابلیت اطمینان NFV | رایانش ابری
مقاله ترجمه شده
6 یک مطالعه مروری در مورد مهاجرت ماشین مجازی و تکنیک های یکپارچه سازی سرور موجود در پایگاه داده ابری با قابلیت DVFS : طبقه بندی و چالش ها
سال انتشار: 2018 - تعداد صفحات فایل pdf انگلیسی: 20 - تعداد صفحات فایل doc فارسی: 60
رایانش ابری یک مدل نویدبخش در مقایسه با روشهای فناوری اطلاعات سنتی است جاییکه سازمانها و بنگاهها خدمات ابر الاستیک را با استفاده از الگوی پرداخت به ازای هر استفاده به منظور کاهش هزینه ها بکار می گیرند مجازی سازی روشی است که بطور گسترده در چایگاه داده مدرن (DC) برای به حداکثر رسانی استفاده از منابع ، کاهش انتشار گازهای گلخانه ای و کاهش هزینه کلی بکار می یرند مهاجرت ماشین مجازی (VM) به طور گسترده ای در داخل و در سراسر DC مورد استفاده قرار می گیرد تا انواع نیازهای محیط ابر مجازی برآورده شود برای مثال ، یکپارچه سازی سرور برای مدیریت نیرو به مهاجرت VM احتیاج دارد. همچنین ، تعادل بار ، تحمل خطا ، نگهداری سیستم و به حداقل رساندن جدولان نقض توافق سطح سرویس (SLA) نیاز به مهاجرت زنده VM دارد. روند مهاجرت VM دارای منابع بسیار فشرده است و به روشهای هوشمند برای جلوگیری از اشباع پهنای باند شبکه و به حداقل رسانی خرابی سرور ، نیاز دارد علاوه بر این ، درجه بندی فرکانس ولتاژ پویا (DVFS) در سرورهای خوشه ای به طور ذاتی فرکانس ولتاژ بر اساس حجم کار برای کاهش مصرف انرژی متغیر است ، که بخش بزرگی از هزینه کل است اگرچه مطالعات متنوع رایانش ابری در تحقیق مربوط به موضوعات اقتصادی ، حفظ حریم خصوصی و امنیت و موارد دیگر ، ارائه شئه است اما مطالعات پیمایشی در مورد مهاجرت VM ، یکپارچه سازی سرور و تکنیک های DVFS. صورت نگرفته است برای رفع این خلا ، ما طرح های متفاوتی را برای طبقه بندی اشتراکات و تفاوت ها از دیدگاه محققان ، بر اساس معیارهای حاصل از تحقیق ارائه می دهیم. سرانجام ، مباحث آزاد ، چالش ها و مسیرهای آینده برای بهبود طرحها و روشهای موجود بحث شده است.
کلمات کلیدی: محاسبات ابری | مهاجرت VM | ادغام سرور | DVFS | تعادل بار | مدیریت قدرت
مقاله ترجمه شده
7 Fault-tolerant tile mining
کاوش دنباله تحمل خطا-2018
Interesting itemset mining is a fundamental research problem in knowledge management and machine learning. It is intended to identify interesting relations between variables in a database using some mea sures of interestingness and has a number of applications, including market basket analysis, web usage mining, intrusion detection, and many others. This paper proposes a new interestingness measure, the fault-tolerant tile. That is based on two observations: (1) the length of an itemset can be as important as its frequency; (2) knowledge discovery from real-world datasets calls for fault-tolerant data mining (e.g. extracting fault-tolerant association rules, analyzing noisy datasets). Given a user-defined fault tolerance value, we are interested in finding the maximum/top-k fault-tolerant tiles. Due to the exponential search space of candidate itemsets, both problems are NP-hard. While using some monotonic property to prune search space is a common strategy for interesting itemset mining, no monotonic property is available for this problem. To tackle the challenge, we utilize the branch-and-bound search strategy to analyze the characteristics of candidate itemsets at each searching branch and estimating their bounds. Our exper imental results show that our algorithms can effectively analyze real datasets and retrieve meaningful results.
Keywords: Itemset mining ، Fault-tolerant ، Optimization ، Exact algorithm
مقاله انگلیسی
8 SunwayMR: A distributed parallel computing framework with convenient data-intensive applications programming
SunwayMR: چارچوب محاسبات موازی توزیع شده با برنامه نویسی کاربردی مناسب با استفاده از داده های فشرده-2017
Managing servers integration to realize distributed data computing framework is an important concern. Regardless of the underlying architecture and the actual distributed system’s complexity, such framework gives programmers an abstract view of systems to achieve variously data-intensive applications. However, some state-of-the-art frameworks need too much library dependencies and parameters configuration, or lack extensibility in application programming. Moreover, general framework’s precise design is a nontrivial work, which is fraught with challenges of task scheduling, message communication and computing efficiency, etc. To address these problems, we present a general, scalable and programmable parallel computing framework called SunwayMR, which only needs GCC/G++ environment. We argue it from the following aspects: (1) Distributed data partitioning, message communication and task organization are given to support transparent application execution on parallel hardware. By searching threads table of each node, the task gets an idle thread (with preferred node IP address) for executing data partition. A novel communication component, SunwayMRHelper, is employed to merge periodical results synchronously. Through identifying whether current node is master or slave, SunwayMR deals with the periodical task’s results differently. (2) As for optimizations, a simple fault tolerance is given to resume data-parallel applications, and thread-level stringstream is utilized to boost computing. To ensure ease-of-use, open Application Programming Interface (API) excerpts can be invoked by various of applications with fewer handwritten code than OpenMPI/MPI. We conduct extensively experimental studies to evaluate the performance of SunwayMR over real-world datasets. Results indicate that SunwayMR (runs on 16 computational nodes) outperforms Spark in various applications, and has good scaling with data sizes, nodes and threads.
Keywords: Parallel processing | Computer software | Software engineering | Software development environment and technique | Distributed programming and environment | SunwayMR
مقاله انگلیسی
9 Toward fault-tolerant parallel-in-time integration with PFASST
به سمت یکپارچه سازی موازی در زمان تحمل خطا با PFASST-2017
We introduce and analyze different strategies for the parallel-in-time integration method PFASST to recover from hard faults and subsequent data loss. Since PFASST stores solutions at multiple time steps on different processors, information from adjacent steps can be used to recover after a processor has failed. PFASST’s multi-level hierarchy allows to use the coarse level for correcting the reconstructed solution, which can help to minimize overhead. A theoretical model is devised linking overhead to the number of additional PFASST iterations required for convergence after a fault. The potential efficiency of different strategies is assessed in terms of required additional iterations for examples of diffusive and advective type.
Keywords: Algorithm-based fault tolerance | Resilience | Parallel-in-time integration | Gray–Scott model | Boussinesq equations
مقاله انگلیسی
10 Modelling green HetNets in dynamic ultra large-scale applications: A case-study for femtocells in smart-cities
مدل سازی HetNets های سبز در برنامه های کاربردی مقیاس بزرگ پویا فوق العاده با دقت بالا: مطالعه مورد برای femtocells در شهرهای هوشمند-2017
In recent years, with the rapid increase in the number of mobile connected devices and data traffic, mobile operators have been trying to find solutions to provide better coverage and capacity for mobile users. In this respect, deployment of femtocells is a promising solution. This paper presents performa bility analysis of femtocells. Unlike the existing studies, the potential reduction of the service capacity due to failures are considered as well as various performance metrics such as throughput, mean queue length, response time, and energy consumption. In other words, the femtocells are modelled as fault tol erant wireless communication systems, considering factors such as mobility of the mobile users, multiple channels for the femtocells, and failure/repair behaviour of the channels for more realistic performance measures. A typical scenario is considered for smart-city applications as case study where a set of fem tocells are deployed within the coverage area of a macrocell. The numerical results presented show the accuracy of the proposed model as an abstraction of a femtocell system. The results also reveal that the computational efficiency of the analytical model is significantly better than simulation.
Keywords: Femtocells | Fault tolerance | Queuing theory | LTE | Smart-cities | Cellular radio
مقاله انگلیسی
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