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A method to integrate energy harvesters into wireless sensor nodes for embedded in-pipe monitoring applications 一种将能量采集器集成到无线传感器节点中的方法,用于嵌入式管道内监测应用
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352196
Fassahat U. Qureshi, A. Muhtaroğlu, K. Tuncay
Batteries are commonly used to power sensors, a fact that carries severe drawbacks such as limited lifetime and regular replacement. Battery powered sensors are particularly impractical in under-water pipelines due to limited access. Therefore, harvesting of ambient energy to power embedded sensors is an attractive option for such systems. A method is proposed, in this paper, to power in-pipe wireless sensor nodes based on energy harvesting techniques, with minimal impact to the pipe performance. Based on the initial analysis presented in the paper, models will be developed next to facilitate the design of an energy harvester system for Turkey-Cyprus water pipeline project currently under construction.
电池通常用于为传感器供电,这一事实带来了严重的缺点,如有限的使用寿命和定期更换。由于通道有限,电池供电的传感器在水下管道中尤其不实用。因此,收集环境能量来为嵌入式传感器供电是这种系统的一个有吸引力的选择。本文提出了一种基于能量收集技术为管道内无线传感器节点供电的方法,该方法对管道性能的影响最小。根据本文提出的初步分析,下一步将开发模型,以促进目前正在建设的土耳其-塞浦路斯供水管道项目的能源收集系统的设计。
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引用次数: 10
Machine learning techniques for improved data prefetching 改进数据预取的机器学习技术
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352208
D. Guttman, M. Kandemir, Meenakshi Arunachalam, R. Khanna
With the advent of teraflop-scale computing on both a single coprocessor and many-core designs, there is tremendous need for techniques to fully utilize the compute power by keeping cores fed with data. Data prefetching has been used as a popular method to hide memory latencies by fetching data proactively before the processor needs the data. Fetching data ahead of time from the memory subsystem into faster caches reduces observable latencies or wait times on the processor end and this improves overall program execution times. We study two types of prefetching techniques that are available on a 61-core Intel Xeon Phi co-processor, namely software (compiler-guided) prefetching and hardware prefetching on a variety of workloads. Using machine learning techniques, we synthesize workload phases and the sequence of phase patterns using raw performance data from hardware counters such as memory bandwidth, miss ratios, prefetches issued, etc. Furthermore, we use performance data from workloads with different impacts and behaviors under various prefetcher settings. Our contribution can help in future prefetching design in the following ways: (1) to identify phases within workloads that have different characteristics and behaviors and help dynamically modify prefetch types and intensities to suit the phase; (2) to manage auto setting of prefetcher knobs without great effort from the user; (3) to influence software and hardware prefetching interaction designs in future processors; and (4) to use valuable insights and performance data in many areas such as power provisioning for the nodes in a large cluster to maximize both energy and performance efficiencies.
随着单协处理器和多核设计上的万亿次浮点运算的出现,通过保持核心数据的供应来充分利用计算能力的技术是非常需要的。数据预取已经成为一种流行的方法,通过在处理器需要数据之前主动获取数据来隐藏内存延迟。将数据提前从内存子系统提取到更快的缓存中可以减少处理器端可观察到的延迟或等待时间,从而提高总体程序执行时间。我们研究了在61核Intel Xeon Phi协处理器上可用的两种预取技术,即各种工作负载上的软件(编译器引导)预取和硬件预取。使用机器学习技术,我们使用来自硬件计数器的原始性能数据(如内存带宽、缺失率、发出的预取等)合成工作负载阶段和阶段模式序列。此外,我们使用来自不同预取器设置下具有不同影响和行为的工作负载的性能数据。我们的贡献可以在以下方面为未来的预取设计提供帮助:(1)识别工作负载中具有不同特征和行为的阶段,并帮助动态修改预取类型和强度以适应阶段;(2)自动设置预取旋钮,无需用户费力;(3)影响未来处理器的软硬件预取交互设计;(4)在许多领域使用有价值的见解和性能数据,例如为大型集群中的节点提供电源,以最大限度地提高能源和性能效率。
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引用次数: 5
An energy consumption model for wireless sensor networks 无线传感器网络的能量消耗模型
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352200
M. Abo-Zahhad, M. Farrag, Abdelhay Ali, Osama Amin
Energy consumption and energy modeling are important issues in designing and implementing of Wireless Sensor Networks (WSNs), which help the designers to optimize the energy consumption in WSN nodes. Good knowledge of the sources of energy consumption in WSNs is the first step to reduce energy consumption. Therefore, an accurate energy model is required for the evaluation of communication protocols. In this paper, we provide an energy model for WSNs considering the physical layer and MAC layer parameters by determining the energy consumed per payload bit transferred without error over AWGN channel. We show how the transmission power must be chosen in order to achieve energy-efficient communications over AWGN channel. We also find that, for each modulation scheme, there are optimal transmission power at which the energy consumption is minimized. Moreover, we investigated the energy saving gained from optimizing the constellation size.
能量消耗和能量建模是无线传感器网络设计和实现中的重要问题,有助于设计人员对无线传感器网络节点的能量消耗进行优化。了解传感器网络的能耗来源是降低能耗的第一步。因此,需要一个准确的能量模型来评估通信协议。在本文中,我们通过确定在AWGN信道上无差错传输的每个有效载荷位所消耗的能量,建立了考虑物理层和MAC层参数的wsn能量模型。我们展示了如何选择传输功率,以实现在AWGN信道上的节能通信。我们还发现,对于每种调制方案,都存在能量消耗最小的最佳传输功率。此外,我们还研究了优化星座大小所获得的节能效果。
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引用次数: 50
A low power and high performance face detection on mobile GPU 基于移动GPU的低功耗高性能人脸检测
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352201
Mainul Hassan, Mengshen Zhao, Seong‐Ho Son, Hyung-seok Lee, Hyung-Geun Kim, B. Jang
Face detection is one of the most popular computer vision applications on mobile platforms. It is a compute-intensive task that consumes significant energy. In this paper, we present an energy efficient face detection implementation that offloads data- and compute-intensive portions of the application onto low-power mobile GPU to save overall power consumption without sacrificing performance. Our experiment on a state-of-the-art mobile processor demonstrates that our proposed approach saves power consumption up to 14.3% and improves performance by 87% over traditional CPU only execution.
人脸检测是移动平台上最流行的计算机视觉应用之一。这是一项消耗大量能源的计算密集型任务。在本文中,我们提出了一种节能的人脸检测实现,该实现将应用程序的数据和计算密集型部分卸载到低功耗的移动GPU上,以节省整体功耗而不牺牲性能。我们在最先进的移动处理器上的实验表明,我们提出的方法比传统的仅CPU执行节省了高达14.3%的功耗,并提高了87%的性能。
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引用次数: 4
A tunable receiver architecture utilizing time-varying matching network for a universal receiver 一种基于时变匹配网络的通用接收机可调谐结构
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352171
Hoda Abdelsalam, E. Hegazi, H. Mostafa, Y. Ismail
This paper presents a digitally controlled RF charge sampling receiver font-end architecture for multiband multi standard RF receivers. A time-varying matching network is proposed instead of traditional ones. The receiver operates in charge domain to produce a band pass Sinc filter centered at the desired local oscillator frequency. A time varying matching network provides tunable matching and selectivity to support multi-bands. This receiver architecture targets LTE band (0.7-2.7) GHz making use of its programmability. Based on a verilogA model, the receiver conversion gain is 33 dB at 2 GHz; the resulting noise figure is 7.3dB, and P1dB and IIP3 of -10dBm are 0 dBm respectively.
提出了一种适用于多频段多标准射频接收机的数字控制射频电荷采样接收机前端结构。提出了一种时变匹配网络来代替传统的匹配网络。接收机在电荷域工作,产生以期望的本振频率为中心的带通Sinc滤波器。时变匹配网络提供可调谐的匹配和选择性,以支持多频段。该接收机架构利用其可编程性,针对LTE频段(0.7-2.7)GHz。基于verilogA模型,接收机在2 GHz时的转换增益为33 dB;所得噪声系数为7.3dB, -10dBm的P1dB和IIP3分别为0dBm。
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引用次数: 0
The impact of FinFET technology scaling on critical path performance under process variations 工艺变化下FinFET技术缩放对关键路径性能的影响
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352194
Osama Abdelkader, H. Mostafa, H. A. Elhamid, A. Soliman
Comparisons of FinFET based ring oscillator (RO) metrics are evaluated with technology scaling from 20nm to 7nm technology. Simulations are based on predictive technology models (PTM) developed by Arizona state university. The impact of process and temperature variations on frequency, power, and power delay product is reported. Performance and power of the RO are improved with technology scaling, however performance is degraded after 14nm technology.
比较了基于FinFET的环形振荡器(RO)的指标,从20nm到7nm的技术缩放进行了评估。模拟基于亚利桑那州立大学开发的预测技术模型(PTM)。报告了工艺和温度变化对频率、功率和功率延迟积的影响。RO的性能和功耗随着技术的扩展而提高,但在14nm技术之后性能下降。
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引用次数: 4
5-Level buck converter with reduced inductor size suitable for on-chip integration 减小电感尺寸的5级降压转换器,适合片上集成
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352205
Abdullah Abdulslam, Y. Ismail
In this paper, a 5-level buck converter is proposed. The circuit structure and the working principle are illustrated. The circuit is capable of providing five different voltage levels at the inductor input with the help of two flying capacitors. The 5-level buck converter can work at different operation regions covering wide range of output voltage values. By reducing the voltage difference at the inductor input, the 5-level buck converter can use smaller inductor compared to both 3-level and conventional buck converters which makes it more suitable for on-chip DC-DC conversion. A test circuit has been implemented in TSMC 65nm technology using 0.5nH on-chip spiral inductor and simulation results show better performance as compared to conventional and 3-level buck converters. For same switching frequency and inductor size, the 5-level buck converter achieves more than a 15% efficiency improvement over a 3-level buck converter at certain output voltage ranges.
本文提出了一种5电平降压变换器。阐述了电路结构和工作原理。该电路能够在两个飞行电容器的帮助下在电感输入端提供五种不同的电压水平。5电平降压变换器可以在不同的工作区域工作,覆盖宽范围的输出电压值。通过减小电感输入端的电压差,与3电平和传统降压变换器相比,5电平降压变换器可以使用更小的电感,这使得它更适合片上DC-DC转换。在台积电65nm工艺下,采用0.5nH片上螺旋电感实现了测试电路,仿真结果表明,与传统和3电平降压变换器相比,该电路具有更好的性能。对于相同的开关频率和电感尺寸,在一定的输出电压范围内,5电平降压变换器比3电平降压变换器的效率提高了15%以上。
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引用次数: 3
Stage optimization in regulated step-up for low voltage electromagnetic energy harvesters 低压电磁能量采集器稳压升压阶段优化
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352198
H. Uluşan, Ö. Zorlu, H. Kulah, A. Muhtaroğlu
This paper presents a performance enhancement feature for a novel power management circuit to generate 1.8 V from the low DC voltage rectified at the output of the vibration-based electromagnetic (EM) energy harvesters. The proposed 180 nm circuit utilizes a low voltage charge pump based boost converter with variable output-stages, and an autonomous regulator circuit with negative feedback topology. 2 and 3 stage charge pump options in the variable stage configuration has been validated to extend the supported input voltage range at the same load, or alternatively maintain higher efficiency operation at a higher load range. The simulation results showed that under no-load condition the output voltage reached to 1.8 V for input voltage of 0.65 V and 0.48 V with 2 and 3 stage outputs, respectively. The power conversion efficiency of the power management circuit can be kept stable around 55% by switching from 2 to 3 stages after 3.5 μA.
本文提出了一种新型电源管理电路的性能增强特性,该电路可以从基于振动的电磁能量采集器输出端整流的低直流电压产生1.8 V的电压。提出的180nm电路采用了一个基于可变输出级的低压电荷泵升压变换器和一个具有负反馈拓扑结构的自主调节电路。可变级配置中的2级和3级电荷泵选项已经过验证,可以在相同负载下扩展支持的输入电压范围,或者在更高负载范围内保持更高的效率运行。仿真结果表明,在空载条件下,输入电压分别为0.65 V和0.48 V,输出电压分别为2级和3级,输出电压达到1.8 V。电源管理电路在3.5 μA电压下从2级切换到3级,功率转换效率稳定在55%左右。
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引用次数: 2
Review of NoC-based FPGAs architectures 基于noc的fpga架构综述
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352172
A. Salaheldin, Karim Abdallah, N. Gamal, H. Mostafa
Nowadays, FPGAs serve as Fields Programmable Systems on Chip (FPSoC) and are widely used to implement computationally intensive world applications. As the number of components in FPSoCs increases, the interconnect schemes based on Network on Chip (NoC) approach are increasingly used to overcome the problems of traditional bus based and point-to-point interconnect scheme. In this paper, we review several designs based on their contributions, architectures, implementations and future works. We also made our comparison between three of these routes to analyze the effect of varying the number of Virtual Channels (VCs), flit data width and buffer depth on the operating frequency, Logic Look-Up Tables (LUTs) and registers to help choosing the appropriate NoC based on system requirements.
如今,fpga作为现场可编程芯片系统(FPSoC)被广泛用于实现计算密集型的世界应用。随着fpsoc中元器件数量的增加,基于片上网络(Network on Chip, NoC)的互连方案越来越多地用于克服传统的基于总线和点对点的互连方案所存在的问题。在本文中,我们根据他们的贡献、架构、实现和未来的工作来回顾几种设计。我们还对这三种路由进行了比较,以分析改变虚拟通道(vc)数量、飞行数据宽度和缓冲区深度对工作频率、逻辑查找表(lut)和寄存器的影响,以帮助根据系统要求选择适当的NoC。
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引用次数: 5
Different scenarios for estimating coupling capacitances of through silicon via (TSV) arrays 通过硅孔(TSV)阵列估算耦合电容的不同场景
Pub Date : 2015-03-24 DOI: 10.1109/ICEAC.2015.7352170
K. Ali, E. Yahya, A. El-Rouby, Y. Ismail
This paper presents characterization for coupling capacitance in through silicon Vias (TSV) arrays. Two scenarios are proposed to estimate the coupling capacitance between TSVs in TSVs array. First scenario is by using a closed form expression that accounts for the shielding effect resulted by TSVs. Second scenario is based on the existence of initial measured capacitance value at certain dimensions, thereafter the capacitance values can be obtained at other dimensions using scaling equations.
本文对硅通孔(TSV)阵列的耦合电容进行了表征。提出了两种场景来估计tsv阵列中tsv之间的耦合电容。第一种情况是使用封闭形式表达式来解释tsv造成的屏蔽效应。第二种情况是基于在某一维度上初始测量电容值的存在,此后可以利用标度方程得到其他维度上的电容值。
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引用次数: 6
期刊
5th International Conference on Energy Aware Computing Systems & Applications
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