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检索条件"任意字段=15th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications"

共 2151 条记录，以下是131-140 订阅

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A Fifty-percent Rule to Minimize the Energy Consumption of PCM-based Storage systems

A Fifty-percent Rule to Minimize the Energy Consumption of P...

引用

ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Yang, Ming-Chang Kuo, Martin Tsao, Che-Wei Chang, Yuan-Hao Acad Sinica Inst Informat Sci Taipei 115 Taiwan Natl Taiwan Ocean Univ Dept Comp Sci & Engn Taipei 202 Taiwan

ISBN: (纸本)9781479908509

In recent years, phase-change memory (PCM) has drawn a lot of attention because of its byte-addressability and non-volatility. It has become a good alternative storage medium to reduce the performance gap between main memory and secondary storage, but its high energy consumption on writes is a challenging issue in the design of battery-powered mobile computing systems. By utilizing the byte-addressability and the asymmetric read-write energy/latency of PCM, we propose an energy-efficient update scheme with a fifty-percent rnle for journaling file systems to reduce the energy consumption. this scheme only writes the modified data, instead of the whole updated block, to PCM-based storage devices with the guarantee of the sanity/integrity of file systems even if the system crashes or power failure occurs during the process of data updates. A series of experiments based on the implementation on the Linux system was conducted to evaluate the capability of the proposed scheme, and the results are very encouraging.

关键词： Energy utilization

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Energy-Aware Navigation and Guidance Algorithms for Unmanned Aerial Vehicles

Energy-Aware Navigation and Guidance Algorithms for Unmanned...

引用

1st international Workshop on Cyber-Physical systems, Networks, and applications (CPSNA) held during 17th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Spinka, Ondrej Hanzalek, Zdenek Res & Tech Inst Czech Air Force Dept Adv Avion Mladoboleslavska 944 Prague 19721 9 Czech Republic Czech Tech Univ Elect Engn Dept Control Engn Prague 12135 2 Czech Republic

ISBN: (纸本)9780769545028

this paper presents two ways of how to tackle a problem of vehicle navigation and guidance, and focuses on evaluation of the performance and energy consumption of both methods. A simple energy-aware computing scheme, intended for control, navigation and guidance of autonomous unmanned aircraft, is proposed to try to make the most of both methods providing good tracking accuracy whenever needed, minimizing power consumption otherwise. this scheme is based on the idea of using simple, non-demanding algorithms whenever possible and switching to sophisticated, more accurate control methods only when required by the mission profile. Simple algorithms may be executed in modules with less computing power, allowing highperformance on-board computers (needed for real-time execution of complex tasks) to be suspended, thus conserving energy. this scheme might bring noticeable benefits especially for vehicles in the micro-UAV category, where the amount of usable energy is extremely limited and the portion of energy consumed by onboard computers might be significant (up to 20%, according our measurements).

关键词： Unmanned Aerial systems Navigation Control and Guidance Algorithms Energy-Aware computing embedded systems

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Towards Full Virtualization of Heterogeneous NoC-based Multicore embedded Architectures

Towards Full Virtualization of Heterogeneous NoC-based Multi...

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15th ieee international conference on Computational Science and Engineering (CSE) / 10th ieee/IFIP international conference on embedded and Ubiquitous computing (EUC)

作者： Kornaros, George Grammatikakis, Miltos D. Coppola, Marcello Technol Educ Inst Crete Iraklion Greece ST Microelect Grenoble France

ISBN: (纸本)9781467351652;9780769549149

As the hardware complexity of embedded systems is increasing exponentially and flexibility is required to adapt them to a wide variety of applications, virtualization technology brings an effective and clean way of isolating applications from hardware. However, a virtualization-ready SoC platform must support the necessary extensions across the HW/SW stack: applications, programming model, hypervisor and hardware platform. In this work we present the main hardware extensions and architecture of a heterogeneous multicore embedded system supporting virtualization, which provides improved security and isolation among virtualized environments. At the same time, we detail the architecture of a hardware I/O management unit that enables virtualization and provides support for global coherent address space, flow isolation and security, resource utilization and runtime monitoring.

关键词： Heterogeneous Multicore SoC Hypervisor IOMMU Monitoring Virtualization

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real-time Communication for Multicore systems with Multi-domain Ring Buses

Real-time Communication for Multicore Systems with Multi-dom...

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16th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Bui, Bach D. Pellizzoni, Rodolfo Chivukula, Deepti K. Caccamo, Marco Univ Illinois Dept Comp Sci Champaign IL 61820 USA

ISBN: (纸本)9780769541556

We address the problem of scheduling real-time data transactions on a multicore processor bus. In particular, to increase system predictability and tighten WCET estimation, we propose to employ a software-controllable Multi-Domain Ring Bus (MDRB) architecture. the problem of scheduling periodic real-time transactions on MDRB is challenging because the bus allows multiple non-overlapping transactions to be executed concurrently, and because the degree of concurrency depends on the topology of the bus and of executed transactions. We propose a practical abstraction mechanism for the scheduling problem together with two novel scheduling algorithms. the first algorithm is optimal for transaction sets under restrictive assumptions while the second one induces a competitive sufficient schedulable utilization bound for more general transaction sets.

关键词： Multi-domain ring bus real-time scheduling real-time systems WCET estimation abstraction mechanism multicore processor bus multidomain ring buses architecture multiprocessing systems periodic real-time transaction scheduling processor scheduling real-time communication real-time data transaction scheduling real-time systems system predictability

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Online Optimization of Security-Sensitive real-time Storage applications for NAND Flash Memory Storage systems

Online Optimization of Security-Sensitive Real-Time Storage ...

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ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Jiang, Wei Ma, Yue Zhang, Xia Wang, Xupeng Shao, Zili Univ Elect Sci & Technol China Coll Comp Sci & Engn Chengdu Peoples R China Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781479908509

With many advantages like low cost, faster and non-volatile, NAND flash memory has become a critical component in building securitycritical real-time embedded devices. In this paper, we are interested in online optimization of securitysensitive storage applications, whose workloads are unpredictable but have explicit deterministic or probabilistic timing constraints and certain security constraints. Sensitive data must be stored before a specific deadline, otherwise it will lose its validity. To address these challenges, this paper presents a Feedback Vulnerability and Utilization Control (FVUC) mechanism. FVUC employs two proportional-integral controllers, the Utilization Controller and Vulnerability Controller, to build a big feedback loop that dynamically monitors the system run-time status as well as decides how many flash pages would be encrypted by a cryptography algorithm. Relied on the accurate model and design, FVUC can make a balance between the utilization and vulnerability, and achieve a better overall performance. the advantages of FVUC are verified by a series of simulation experiments under a broad range of system configurations and run-time uncertainties.

关键词： NAND Flash Memory Storage System real-time System Security-Critical Vulnerability Feedback Control

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An Online Holistic Scheduling Framework for Energy-Constrained Wireless real-time systems

An Online Holistic Scheduling Framework for Energy-Constrain...

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作者： Chantem, thidapat Yi, Jun Hong, Shengyan Hu, X. Sharon Poellabauer, Christian Zhang, Liqiang Univ Notre Dame Dept CSE Notre Dame IN 46556 USA Indiana Univ South Bend Dept CIS South Bend IN 46634 USA

ISBN: (纸本)9780769545028

We consider wireless real-time systems that execute computationally-intensive applications and must transmit packets over the network in a timely manner. Existing methods do not consider the importance (i.e., urgency) of a packet as perceived by end users in conjunction with energy consumption, real-time task deadlines, and packet deadlines, inadvertently causing packet priority inversion during transmissions and possibly starvation of some streams. We present an online holistic scheduling framework that explicitly considers packet importance to select packets to transmit and guarantee their deadline requirements using both packet and energy-aware job assignment and scheduling. Our framework is applicable to wireless real-time systems equipped with either a single processor or a multicore system. Based on extensive simulations, we show that our proposed method allows for timely transmissions of the most important packets, which helps to control packet urgency, while saving processor(s) energy.

关键词： real-time systems energy job scheduling multicore packet scheduling Packet real-time systems Multi-core processors packet schedule TASK SCHEDULING Energy sources Urinary Urgency Uniprocessor TRANSMITTING wireless Frameworks End users

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A Library-based Tool to Improve CPU Assignment for Multicore Processor-based Pervasive Servers

A Library-based Tool to Improve CPU Assignment for Multicore...

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16th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Ohno, Yuki Akioka, Sayaka Sugaya, Midori Nakajima, Tatsuo Waseda Univ Dept Comp Sci & Engn Shinjuku Ku 3-4-1 Okubo Tokyo 1698555 Japan

ISBN: (纸本)9780769541556

this paper proposes SPLiT (Scalable Performance Library Tool) as the methodology to improve performance of applications on multicore processors, through CPU, and cache optimizations. SPLiT analyzes applications based on cycle counts, and cache misses, and predicts behavior of the applications according to the analysis. With these acquired knowledge on the target application, SPLiT improves CPU resource allocation determined by operating systems. SPLiT, and SPLiT library are designed to achieve resource optimizations based on the combination of hardware information collected by Operating System kernel, and software information collected by applications. Additionally, all the features of SPLiT are immediately available with the small modifications to the application source codes, and the modifications are basically to implant SPLiT library calls into the source code. this simple requirement diminishes programmers' difficulties for performance tuning of multicore applications. through empirical experiments, we validated the efficiency of SPLiT, and observed that performance of the web application was improved by 26%.

关键词： Multi-core processors central processing units web applications Operating systems Source code Servers Libraries Cache memory

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Solar Tune: real-time Scheduling with Load Tuning for Solar Energy Powered Multicore systems

Solar Tune: Real-Time Scheduling with Load Tuning for Solar ...

引用

ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Wang, Yi Chen, Renhai Shao, Zili Li, Tao Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA

ISBN: (纸本)9781479908509

In this paper, we target at the direct-coupled solar energy powered multicore architectures that provide direct power supply between photovoltaic (PV) generation and the load without the adoption of battery. We present SolarTune, a real-time scheduling technique with load tuning for sporadic tasks on solar energy powered multicore systems. the objective is to frilly utilize the available solar energy while meeting the deadlines of tasks. To solve the problem, we first perform analysis and formulate the scheduling problem in each duration as an integer linear programming (ILP) model to obtain an optimal schedule. then we present a heuristic algorithm to dynamically refine the task scheduling based on the predictions of the availability of solar energy. We conduct experiments using real-world meteorological data across different geographic sites. the experimental results show that SolarTune can significantly improve the solar energy utilization ratio and reduce the number of deadline misses compared to the conventional task scheduler.

关键词： Solar energy

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Energy Efficient Scheduling for real-time embedded systems with QoS Guarantee

Energy Efficient Scheduling for Real-Time Embedded Systems w...

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16th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Niu, Linwei Claflin Univ Dept Math & Comp Sci Orangeburg SC 29115 USA

ISBN: (纸本)9780769541556

While the dynamic voltage scaling (DVS) techniques are efficient in reducing the dynamic energy consumption for the processor, varying voltage alone becomes less effective for the overall energy reduction as the static power is growing rapidly. On the other hand, Quality of Service (QoS) is also a primary concern in the development of today's pervasive computing systems. In this paper, we propose a dynamic approach to minimize the overall energy consumption for soft real-time systems while ensuring the QoS-guarantee. the QoS requirements are deterministically quantified with the window-constraints, which require that at least m out of each non-overlapped window of k consecutive jobs of a task meet their deadlines. Necessary and sufficient conditions for checking the feasibility of task sets with arbitrary service times and periods are developed to ensure that the window-constraints can be guaranteed in the worst case. And efficient scheduling techniques based on pattern variation and dynamic slack reclaiming extensions are proposed to combine the task procrastination and dynamic slowdown to minimize the energy consumption. In contrast to the previous leakage-aware slack reclaiming work which never scales the job speed below the critical speed, we will show that it can be more energy efficient to reclaim the slack with speed lower than the critical speed when necessary. through extensive simulations, our experiment results demonstrate that the proposed techniques significantly outperformed the previous research in both overall and idle energy reduction.

关键词： Energy conservation energy consumption Quality of service critical velocity Pulverized coal Energy efficiency soft real-time system embedded systems real-time systems

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Design Space Exploration for Low-Power Memory systems in embedded Signal Processing applications

Design Space Exploration for Low-Power Memory Systems in Emb...

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ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Balasa, Florin Gingu, Cristian V. Luican, Ilie I. Zhu, Hongwei Amer Univ Cairo Dept Comp Sci & Engn Cairo Egypt Fermilab Natl Accelerator Lab Batavia IL 60555 USA Microsoft Inc Redmond WA 98052 USA ARM Inc San Jose CA 95134 USA

ISBN: (纸本)9781479908509

this paper presents an energy-aware electronic design automation (EDA) methodology for the system-level exploration of hierarchical storage organizations, focusing mainly on data-intensive signal processing applications. Starting from the high-level behavioral specification of a given application, several memory management tasks are addressed in a common algebraic framework, using data-dependence analysis techniques similar to those used in modern compilers. Within this memory management software system, the designer can explore different algorithmic specifications functionally equivalent, by computing their minimum storage requirements. the system can perform an exploration based on energy consumption of signal assignments to the off-and on-chip memory layers, followed by a storage-efficient mapping of signals to the physical memories. the last phase of the methodology is an exploration approach for energy-aware banking of the on-chip memory, which takes into account both the static and dynamic energy consumption.

关键词： Digital storage

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