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Next location prediction has aroused great inter-ests in the era of internet of things(IoT).With the ubiquitous deployment of sensor devices,e.g..GPS and Wi-Fi,loT en-vironment offers new opportunities for proactively analyzing human mobility patterns and predicting user's future visit in low cost,no matter outdoor and indoor.In this paper,we con-sider the problem of next location prediction in loT environ-ment via a session-based manner.We suggest that user's future intention in each session can be better inferred for more ac-curate prediction if patterns hidden inside both trajectory and signal strength sequences ollected from IoT devices can be jointly modeled,which however existing state-of the-art meth-ods have rarely addressed.To this end,we propose a trajectory and sIgnal sequence(TSIS)model,where the trajectory transi-tion regularities and signal temporal dynamics are jointly embedded in a neural network based model.Specifically,we employ gated recurrent unit(GRU)for capturing the temporal dy-namics in the mutivariate signal strength sequence.Moreover,we adapt gated graph neural networks(gated GNNs)on loca-tion transition graphs to explicitly model the transition patterns of trajectories.Finally,both the low-dimensional representa-tions learned from trajectory and signal sequence are jointly optimized to construct a session embedding,which is further employed to predict the next location.Extensive experiments on two real-world Wi-Fi based mobility datasets demonstrate that TSIS is effective and robust for next location prediction pompared with other competitive baselines. 相似文献
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为了延长电池供电的便携式电子产品的寿命并满足性能需求,迫切需要降低功耗.以军用手持计算器设计为例,研究了手持设备低功耗设计的主要技术和关键设计环节.从器件选择、动态电压调整(DVS)、供电管理和存储器管理等方面详细阐述了各部件的软硬件协同低功耗实现.测试结果表明,该计算器达到低功耗应用要求,设计方法对于其它的手持设备具有参考价值. 相似文献
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低功耗无线传感器网络节点的设计 总被引:6,自引:1,他引:5
在对无线传感器(WSNS)网络体系结构、传感器节点的特点、功能分析的基础上,给出了无线传感器网络节点的软硬件低功耗设计与实现方案.传感器节点以低功耗嵌入式处理器MSP430F1611为核心,TinyOS为嵌入式实时操作系统,配以基于IEEE 802.15.4的MAC层协议的无线传输模块作为网络数据出口以及CC2420无线收发器,可以实现高速的数据采集和可靠的数据传送,能够较好地达到低功耗和实时性的要求.测试结果证明:该平台适合节点的应用,具有易使用、低功耗特点. 相似文献
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《单片机与嵌入式系统应用》2012,(3):86-88
Microchip推出具有全新低功耗休眠模式的16位MCUMicrochip Technology Inc.(美国微芯科技公司)推出具有多种灵活全新低功耗休眠模式且工作电流极低的PIC24F"GA3"16位闪存MCU系列,扩展其超低功耗(XLP)单片机(MCU)产品线。PIC24F"GA3"器件具 相似文献
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嵌入式系统低功耗软件技术研究 总被引:2,自引:0,他引:2
姚伟 《计算机技术与发展》2011,21(1)
嵌入式系统低功耗设计中有硬件技术无法涉足的空间,可通过低功耗软件技术实现降低系统功耗的目的.针对液晶显示器(LCD)电气特性,从软件角度,综合运用动态电源管理技术和动态电压管理技术,根据处理器负载变化趋势和对空闲模式计时的思想,给出了降低液晶显示器功耗的算法和策略;利用优化编译技术中的操作替换和指令排序方法,分析和研究图形图像处理中常见的矩阵变换算法,给出了低功耗策略和验证节能73.9%.并就低功耗软件技术算法和策略给出了结论和提出了下一步研究的方向. 相似文献
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本文介绍了物联网的发展现状,引出低功耗广域网络(LPWAN)产生的背景;以NB_IoT和LoRa两种技术为代表,分析了低功耗广域物联网的关键技术;对NB_IoT和LoRa两种技术的性能进行简单比较,并举例分析了各自的应用场景. 相似文献