共查询到20条相似文献，搜索用时 156 毫秒
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本文介绍了钢丝绳无损检测的原理,检测过程中的局限性,优缺点。阐述了钢丝绳管理的国内外现状,钢丝绳管理的科学的方法。对科学合理的钢丝绳管理提出了解决方案与发展思路。 相似文献
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边缘提取与检测在图像处理中占有很重要的地位,其算法的优劣直接影响着所研制系统的性能。文章对诸多边缘检测的方法进行分析和总结,同时也指出存在的局限性和不足,最后通过实验得出结论:在绝大多数情况下,Canny算子是一种很好边缘检测方法。 相似文献
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针对传统硬度测量方法的局限性,阐述了超声波、电涡流等无损检测手段进行机械零部件表面硬度测量的系统和原理,并对无损硬度检测方法的应用进行了简单介绍,最后得出无损检测表面硬度是优势。 相似文献
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提出了一种基于动态控制流路径分析的隐藏恶意代码检测方法.该方法首先有针对性地选取与恶意代码相关的敏感路径并动态记录其执行过程的控制流路径,然后采用基于调用层次树匹配的异常检测算法分析所获得的数据,从而检查出系统中隐藏型恶意代码.实验结果表明,该方法能有效检测出隐藏恶意代码,具有高检出率和低误报率的特点,适用于计算机操作系统内的隐藏型恶意代码的检测. 相似文献
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通过对恶意文档的攻击方式、组成结构和攻击代码的全面分析,提出了一种基于空间向量计算的检测方法,针对典型的变形手段提出了有针对性的改进.对119个文档进行了检测,结果表明,与传统检测软件相比,该算法对恶意文档检测在漏报率和误报率上均具备一定优势. 相似文献
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介绍了一种基于ATMEGA64和MCP3202的多通道数据检测卡的设计过程,详细说明了系统功能和软、硬件设计方法,并着重指出系统软件校正、标定的方法。该系统具有准确性高、稳定性好、成本低廉等特点,已经成功应用于某大型医疗设备中,取得了理想效果。 相似文献
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Emad S. Hassan 《Journal of The Franklin Institute》2019,356(3):1640-1657
The multi-taper spectrum (MTS) estimator enjoys a relatively low computational complexity and high estimation accuracy making it an attractive method for spectrum sensing in cognitive radio (CR) networks. However, it is difficult to guarantee both detection and false alarm probabilities when its design is based on fixed threshold, especially when the noise power fluctuates due to channel conditions. In this paper, a new adaptive threshold method to guarantee both detection and false alarm probabilities for MTS based spectrum sensing is proposed. By means of estimating noise power and signal power, the decision of adaptive threshold is able to adapt the noise fluctuation and achieve efficient trade-off between detection and false alarm probabilities. A closed form expression for the adaptive threshold is derived for both additive white Gaussian noise (AWGN) channel and multipath fading channel. Several metrics are employed to compare the performance of the proposed adaptive threshold method with that of the fixed threshold methods such as: error decision probability, detection probability, false alarm probability and throughput. The obtained results show that the proposed method achieves better spectrum efficiency and high throughput in comparison with the conventional fixed and adaptive threshold methods presented in the literature. 相似文献
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In this paper, we propose a novel approach for multilingual story link detection. Our approach utilized the distributional features of terms in timelines and multilingual spaces, together with selected types of named entities in order to get distinctive weights for terms that constitute linguistic representation of events. On timelines term significance is calculated by comparing term distribution of the documents on a day with that of the total document collection. Since two languages can provide more information than one language, term significance is measured on each language space, which is then used as a bridge between two languages on multilingual spaces. Evaluating the method on Korean and Japanese news articles, our method achieved 14.3% improvement for monolingual story pairs, and 16.7% improvement for multilingual story pairs. By measuring the space density, the proposed weighting components are verified with a high density of the intra-event stories and a low density of the inter-events stories. This result indicates that the proposed method is helpful for multilingual story link detection. 相似文献
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针对船舶压载水携带微小生物导致物种入侵问题,国际海事组织（IMO）规定,可排放的压载水中10μm至50μm的可栓出存活生物的浓度应小于10cells／mL。常规显微镜检测方法要求生物量为10^6cells／mL较为适宜,生物量较低时需对微小生物扩增培养,耗时较长,满足不了快速检测的要求。针对低生物量检测问题,本研究采用自制硅铁复合絮凝剂,以人工培养的海洋微藻模拟船舶压载水中微小生物,对微藻进行絮凝富集和快速检测实验研究。研究结果表明,该絮凝剂具有良好的絮凝能力,对于细胞浓度分别为5．55×10^5cells／mL的异弯藻和1．99×10^6cells／mL的三角褐指藻,絮凝剂浓度分剐为0053μL／mL和0．027μL／mL时,絮凝效率都能达到91％以上;对藻细胞浓度低于10^6cells／mL系列浓度藻液的絮凝实验表明,该絮凝剂能实现对藻细胞浓度低于10cells/mL微藻的捕捉富集。该絮凝富集方法的使用。为船舶压载水中微小生物的快速检测提供了技术支持,在海洋入侵微小生物监测应用中具有一定可行性; 相似文献
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《Journal of The Franklin Institute》2021,358(15):8085-8108
This paper proposes an improved model based pipeline leak detection and localization method based on compressed sensing (CS) and event-triggered (ET) particle filter (ET-PF). First, the state space model of the pipeline system is established based on the characteristic line method. Then, the CS method is used to preprocess the sensor signals to recover the potentially lost leak information which is caused by the low sampling frequency of the industrial pipeline sensors, and an event based beetle antennae search (BAS) particle filter (BAS-PF) is proposed to improve the accuracy and efficiency of the pipeline state estimation. Finally, a pipeline leak detection and localization method is developed based on the proposed signal processing, and state estimation algorithms, as well as a pipeline partition strategy. Experiment results show that the proposed method can accurately detect and locate the leak of the pipeline system with a localization error of about 1.4%. 相似文献