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本文从数据交互,特点等方面详细地论述了两种常用的网络存储数据访问方法一smb和NFS,最后对二者的差别进行了比较。 相似文献
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如何存储应用系统中需要处理的非结构化数据,包括文本、图像、音频、视频、PDF、电子表格等,是常常困扰系统设计人员的一个问题。非结构化数据的存储通常有两种方式,一种方式是将这些数据以文件的方式存储在文件系统中,同时将指向文件的链接或路径存储在数据 相似文献
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为了满足机载雷达数据存储系统对数据存储器大容量、读写速度快的需求,提出一种基于ZYNQ的eMMC雷达数据存储系统设计方案。该系统以ZYNQ-7000系列芯片为主控芯片,通过PL端对接收的雷达数据和GPS数据进行解析和组帧,将乒乓缓存技术与AXI4总线结合后把组帧后的数据传输到PS端的DDR中缓存,然后写入eMMC存储单元,存储完成后进行回读验证数据。实验结果表明,存储数据速度可达到60 MB/s,系统运行稳定,存储数据完整。相比于其他雷达数据存储系统,该系统具有高容量、集成度高、存储速度快的优点。 相似文献
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基于嵌入式视频存储的特点,分析目前已有的文件系统在视频应用上的不足,提出了适合硬盘录像机的专用文件系统设计方案,并从数据存储、检索、读取和恢复等方面阐述了设计思想及具体实现。经过在相关产品上的应用,表明该文件系统可以实现高效、安全的视频存储。 相似文献
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《计算机应用与软件》2016,(8)
互联网大数据蓬勃发展,各个行业都围绕着大数据展开研究。与此同时,由于数据量的异常膨胀,随之而来的问题就是如何回收垃圾数据。基于云存储日志文件系统HLFS(Hadoop distributed file system based Log-structured File System),设计与实现了垃圾数据回收子系统。通过在HLFS中添加垃圾回收子系统,不但可以提高数据空间的利用率,还可以有效地避免数据空间不够用。为了分析HLFS中垃圾回收子系统的性能,最后对比了HLFS垃圾回收子系统和其他系统中垃圾数据回收机制的优缺点,从而帮助用户选择合适的垃圾回收机制提高磁盘利用率和系统性能。 相似文献
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Hubert Yoshida 《微电脑世界》2012,(10):97
目前,对于"大数据"的讨论很多,公认的看法是将大数据的系列问题归纳为:海量的数据规模(volume)、快速的数据流转和动态的数据体系(velocity)、多样的数据类型(variety)和巨大的数据价值(value),以及我们的对策。但实际上,大数据首先要考虑的应该是"大"——海量的数据规模。 相似文献
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Yermolin O. V. Muzhichek S. M. Pavlov V. I. Sebryakov G. G. Skrynnikov A. A. 《Journal of Computer and Systems Sciences International》2022,61(3):421-429
Journal of Computer and Systems Sciences International - The features of payload control are indicated on the example of an unmanned aerial vehicle equipped with an onboard radar station, when it... 相似文献
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Brandon Stark Calvin Coopmans YangQuan Chen 《Journal of Intelligent and Robotic Systems》2013,69(1-4):5-20
Unmanned Aerial Systems (UASs) have rapidly grown into a significant part of the world-wide aviation budget. However, regulations and official standards have lagged significantly. Within the U.S., there has been significant pressure to develop the regulations to allow commercial and governmental agencies to utilize UASs within the National Airspace System (NAS). The authors propose a concept of operation document that incorporates existing regulations and ensures an acceptable level of performance based on experience with a Personal Remote Sensing (PRS) Unmanned Aerial System (UAS). 相似文献
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Gon?alo Charters Santos Cruz Pedro Miguel Martins Encarna??o 《Journal of Intelligent and Robotic Systems》2012,65(1-4):203-217
This work is framed within the PITVANT project and aims to contribute to the development of obstacle avoidance techniques for unmanned aerial vehicles (UAVs). The paper describes the design, implementation and experimental evaluation of a potential field obstacle avoidance algorithm based on the fluid mechanics panel methods. Obstacles and the UAV goal position are modeled by harmonic functions thus avoiding the presence of local minima. Adaptations are made to apply the method to the automatic control of a fixed wing aircraft, relying only on a local map of the environment that is updated with information from sensors onboard the aircraft. Hardware-In-Loop simulations show the good performance of the proposed algorithm in the envisioned mission scenarios for the PITVANT vehicles. 相似文献
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Omer Cetin Sefer Kurnaz Okyay Kaynak 《Journal of Intelligent and Robotic Systems》2011,61(1-4):239-250
This paper is concerned with autonomous flight of UAVs and proposes a fuzzy logic based autonomous flight and landing system controller. Besides three fuzzy logic controllers which are developed for autonomous navigation for UAVs in a previous work as fuzzy logic based autonomous mission control blocks, three more fuzzy logic modules are developed under the main landing system for the control of the horizontal and the vertical positions of the aircraft against the runway under a TACAN (Tactical Air Navigation) approach. The performance of the fuzzy logic based controllers is evaluated using the standard configuration of MATLAB and the Aerosim Aeronautical Simulation Block Set which provides a complete set of tools for rapid development of 6 degree-of-freedom nonlinear generic manned/unmanned aerial vehicle models. Additionally, FlightGear Flight Simulator and GMS aircraft instruments are deployed in order to get visual outputs that aid the designer in evaluating the performance and the potential of the controllers. The simulated test flights on an Aerosonde indicate the capability of the approach in achieving the desired performance despite the simple design procedure. 相似文献
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根据无人机系统的舵机测试需求,给出了基于虚拟仪器组成舵机测试系统的设计思想,在软件开发中对舵机各个参数的测试方法和测试流程给出了恰当设计等,用几个典型的参数测试阐明了该系统的应用.利用该系统全面测试舵机的各项性能指标,对研发新的舵机产品具有实用价值. 相似文献
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根据无人机载视频图像实时采集系统的要求,设计了嵌入式视频采集处理系统。对于模拟摄像头隔行视频数据输出情况以及i.MX27数字接口CSI逐行数字视频数据CCIR BT.656视频输入接口要求,采用TW9912完成模拟视频数据数字化采集和隔行变逐行的数据采集处理,解决了模拟摄像头和嵌入式编解码芯片i.MX27视频采集接口问题。实验结果表明,利用本处理方法有效解决了过去采用图像处理算法的软件处理方法效果不理想的问题,保证了整个视频处理系统的高效实时图像处理的要求。 相似文献