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UAV signal recognition technology 无人机信号识别技术
Yin Xue, Yuan-Lung Chang, Yu Zhang, Jiajun Ma, Guangjie Li, Q. Zhan, Dandan Wu, Jiancun Zuo
The wide application of drones brings convenience to all aspects of society, but also seriously threatens the safety of the low-altitude field. In recent years, the number of accidents caused by UAVs is increasing, and it is urgent to study effective signal recognition technology for UAV targets in the low-altitude field. Therefore, this paper introduces the categories of UAV signals and explains the basic principles of signal recognition technology. Then it concludes a variety of signal recognition technologies and compares and analyzes the performance of existing technologies. Finally, it summarizes and prospects for the UAV signal recognition technology.
无人机的广泛应用给社会各方面带来便利的同时,也严重威胁着低空领域的安全。近年来,无人机造成的事故数量不断增加,研究针对低空领域无人机目标的有效信号识别技术迫在眉睫。因此,本文介绍了无人机信号的种类,阐述了信号识别技术的基本原理。然后总结了各种信号识别技术,并对现有技术的性能进行了比较和分析。最后,对无人机信号识别技术进行了总结和展望。
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引用次数: 2
3D Model Retrieval Algorithm Based on Attention and Multi-view Fusion 基于注意力和多视角融合的三维模型检索算法
Ziqi Shi, Ziyang Quan, Jingshan Shi, Zhuyan Guo, Mandun Zhang, Zhidong Xiao
With the rapid development of computer vision, 3D data is increasing rapidly. How to retrieve similar model from a large number of models has become a hot research topic. However, in order to meet people's demand, the retrieval accuracy need to be further improved. In terms of multi-view 3D model retrieval, how to effectively learn the information between views is the key to improving performance. In this paper, we propose a novel 3D model retrieval algorithm based on attention and multi-view fusion. Specifically, we mainly constructed two modules. First, dynamic attentive graph learning module is used to learn the intrinsic relationship between view blocks; Then we propose the Attention-NetVlad algorithm, which combines the channel attention algorithm and the NetVlad algorithm. It learns the information between feature channels to enhance the feature expression ability firstly, then uses the NetVlad algorithm to fuse multiple view features into a global feature according to the clustering information. Finally the global feature is used as the only feature of the model to retrieve according to Euclidean distance. In comparison with other state-of-the-art methods by utilizing ModelNet10 and ModelNet40 the proposed method has demonstrated significant improvement for retrieval mAP. Our experiments also demonstrate the effectiveness of the modules in the algorithm.
随着计算机视觉技术的飞速发展,三维数据量迅速增加。如何从大量的模型中检索出相似的模型已经成为一个热门的研究课题。然而,为了满足人们的需求,检索精度还需要进一步提高。在多视图三维模型检索中,如何有效地学习视图之间的信息是提高检索性能的关键。本文提出了一种基于注意力和多视角融合的三维模型检索算法。具体来说,我们主要构建了两个模块。首先,采用动态关注图学习模块学习视图块之间的内在关系;然后,我们提出了一种将信道注意算法和NetVlad算法相结合的attention -NetVlad算法。该算法首先学习特征通道之间的信息,增强特征表达能力,然后利用NetVlad算法根据聚类信息将多个视图特征融合为一个全局特征。最后将全局特征作为模型的唯一特征,根据欧氏距离进行检索。与利用ModelNet10和ModelNet40的其他最新方法相比,该方法在检索mAP方面有了显著的改进。实验也验证了算法中各模块的有效性。
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引用次数: 1
A task allocation algorithm for Coverage-Aware Crowdsensing with Data timeliness 具有数据时效性的覆盖感知众测任务分配算法
Chenxi Pan, Shuyu Li
In the task allocation of mobile crowdsensing (MCS), importance is often attached to the quality of sensing data while the data timeliness is often neglected, which may lead to the slow response of the MCS platform for urgent tasks (such as fire, geological disasters, etc.), thus missing the golden response time. Based on the definition of worker data timeliness and area coverage, a coverage-aware task allocation algorithm (CATA) is proposed in the paper. The CATA algorithm adopts fog nodes as the intermediate layer between MCS platform and participants and tries to both maximize the data timeliness and minimizing the incentive cost. For tasks with given location and crowdsensing range, workers with higher data timeliness and lower bidding are selected from participants according to their data timeliness and virtual credit. In addition, the location privacy of participants is protected by geo-indistinguishability. Results of simulation experiment validate the effectiveness of the proposed algorithm.
在移动众传感(MCS)的任务分配中,往往重视感知数据的质量,而忽视数据的时效性,这可能导致MCS平台对紧急任务(如火灾、地质灾害等)的响应速度较慢,从而错过黄金响应时间。基于工人数据时效性和区域覆盖的定义,提出了一种覆盖感知任务分配算法(CATA)。CATA算法采用雾节点作为MCS平台与参与者之间的中间层,力求数据及时性最大化和激励成本最小化。对于给定地点和众测范围的任务,根据参与者的数据时效性和虚拟信用,从参与者中选择数据时效性较高、出价较低的员工。此外,参与者的位置隐私受到地理不可区分性的保护。仿真实验结果验证了该算法的有效性。
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引用次数: 0
A Comprehensive Study to Analyze Trends in Web Search Interests Related to Fall Detection Before and After COVID-19 新型冠状病毒肺炎前后跌倒检测相关网络搜索兴趣趋势综合分析
Nirmalya Thakur, Isabella Hall, Chia Y. Han
Falls, considered a serious health-related concern for the elderly people, are associated with multiple diverse and dynamic needs for the elderly people themselves, their caregivers, their family members, and healthcare professionals. The modern-day Internet of Everything lifestyle is characterized by people using the internet for a multitude of reasons which also includes seeking and sharing information related to such needs. Such activity on the internet results in the generation of tremendous amounts of web behavior-based Big Data which can be studied and analyzed to investigate the trends in the underlining needs and the associated web search interests. The COVID-19 pandemic that the world is facing right now has impacted the elderly population to a significant extent. In fact, the elderly population is considered a demographic group that is most likely to get infected by this virus and develop serious symptoms, which could lead to hospitalizations and death. There hasn't been any study conducted in the field of aging research thus far that investigates how the COVID-19 pandemic may or may not have impacted the needs related to fall detection in the elderly. This work aims to address this research challenge. A dedicated methodology based on Google Trends is proposed in this paper that studies the web behavior-based Big Data related to fall detection from different countries both before and after the pandemic. The preliminary results presented from the analysis of the web behavior-based Big Data from 14 countries - USA, India, Germany, United Kingdom, Spain, Australia, Indonesia, Malaysia, Thailand, South Africa, Canada, Philippines, Sweden, and Ireland, which are amongst the countries worst hit by COVID-19, shows evidence that the pandemic had an impact towards increasing the web search interests related to fall detection in multiple countries.
跌倒被认为是老年人严重的健康相关问题,它与老年人自身、照顾者、家庭成员和保健专业人员的多种多样和动态需求有关。现代万物互联生活方式的特点是人们出于多种原因使用互联网,其中还包括寻找和分享与此类需求相关的信息。互联网上的此类活动产生了大量基于网络行为的大数据,可以对这些数据进行研究和分析,以调查潜在需求和相关网络搜索兴趣的趋势。当前世界面临的新冠肺炎疫情对老年人口产生了很大影响。事实上,老年人被认为是最容易被这种病毒感染并出现严重症状的人口群体,这可能导致住院和死亡。到目前为止,在老龄化研究领域还没有进行过任何研究,调查COVID-19大流行可能会或可能不会影响老年人对跌倒检测的需求。这项工作旨在解决这一研究挑战。本文提出了一种基于谷歌趋势的专用方法,研究大流行前后不同国家跌倒检测相关的基于网络行为的大数据。对受COVID-19影响最严重的14个国家(美国、印度、德国、英国、西班牙、澳大利亚、印度尼西亚、马来西亚、泰国、南非、加拿大、菲律宾、瑞典和爱尔兰)基于网络行为的大数据进行的初步分析结果显示,有证据表明,疫情对增加多个国家与摔倒检测相关的网络搜索兴趣产生了影响。
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引用次数: 2
Underwater Acoustic Point-cloud Filtering via Adaptive Unsharp Masking 基于自适应非锐化掩蔽的水声点云滤波
Jisong Wang, Xuewu Zhang, Xiaolong Xu, Ke-Pu Song
Owing to the complex water environment, the acoustic point-cloud model formed by the detection method based on acoustic reflection mechanism is inevitably disturbed by the noise, which seriously affects the reconstruction effect of the underwater targets. Distinguishing between geometric features and noise is of paramount importance for the underwater point-cloud model filtering. Inspired by the classic image detail enhancement method of unsharp masking, we take the geometric coordinate information of the point as the research object and design a geometric feature-preserving adaptive unsharp masking filtering for the underwater point-cloud model. First, the proposed method directly performed a low-pass filtering using the neighborhood information to obtain the main structure of the input point-cloud model. Second, the detail layer was yielded by the difference between the input point-cloud model and the base layer. Third, the different scaling factors measuring the importance of the points with respect to the whole base layer were used to adaptively enhance the detail layer. Experimental results show that the proposed algorithm can effectively remove noise while maintaining the geometric characteristics of the model, which is obviously better than other comparison methods.
由于水环境复杂,基于声反射机制的探测方法所形成的声点云模型不可避免地受到噪声的干扰,严重影响水下目标的重建效果。在水下点云模型滤波中,几何特征和噪声的区分是至关重要的。在经典图像细节增强方法的启发下,以点的几何坐标信息为研究对象,设计了一种水下点云模型的几何特征保持自适应非锐利掩蔽滤波。首先,该方法直接利用邻域信息进行低通滤波,得到输入点云模型的主体结构;其次,根据输入点云模型与基础层的差值生成细节层;第三,利用不同的尺度因子来衡量点相对于整个基础层的重要性,自适应增强细节层。实验结果表明,该算法在保持模型几何特征的同时,能够有效地去除噪声,明显优于其他比较方法。
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引用次数: 0
Skin melanoma segmentation algorithm using dual-channel efficient CNN network 基于双通道高效CNN网络的皮肤黑色素瘤分割算法
Yadi Zhen, Jianbing Yi, Feng Cao, Jun Li, Jun Wu
Except for early surgical resection, melanoma lacks special treatment, while image segmentation can effectively assist doctors to enhance the efficiency of early diagnosis of melanoma. Due to the non-uniform size, shape and color of melanoma, it is difficult to segment the boundary of its lesion area. To solve the above problems, an improved DC-Unet network segmentation algorithm is proposed in this paper. A channel attention ECA-NET module was first introduced to make the model more focused on the lesion area of melanoma. Finally, the segmentation results are post-processed by Conditional Random Field (CRF) and Test Data Augmentation (TTA) to further refine the segmentation results. The experimental results showed that compared with the DC-Unet algorithm on the ISIC2017, ISIC2018 datasets, the segmentation accuracy was increased from 0.9513, 0.9444 to 0.9623, 0.9537 respectively.
除了早期手术切除外,黑色素瘤缺乏特殊的治疗方法,而图像分割可以有效地辅助医生提高对黑色素瘤的早期诊断效率。由于黑色素瘤的大小、形状和颜色不均匀,很难分割其病变区域的边界。针对上述问题,本文提出了一种改进的DC-Unet网络分割算法。首先引入通道关注ECA-NET模块,使模型更专注于黑色素瘤病变区域。最后,对分割结果进行条件随机场(CRF)和测试数据增强(TTA)的后处理,进一步细化分割结果。实验结果表明,与DC-Unet算法在ISIC2017、ISIC2018数据集上的分割精度相比,分割精度分别从0.9513、0.9444提高到0.9623、0.9537。
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引用次数: 0
A Novel Image perceptual hashing algorithm based on frequency decomposition and LoG 一种基于频率分解和LoG的图像感知哈希算法
Zihao Yang, Guosheng Hao, Xiaoyun Zhou, Wang Ruan
The perceptual hashing (pHash) algorithm generate a unique sequence of image. The similarity of images can be determined by comparing the distance between the hash sequences. A novel pHash methods is proposed in this paper.Firstly, the image after pre-processing is decomposed by NSCT into high-frequency and low-frequency parts, and the Zernike moments of high-frequency and LBP features of low-frequency are extracted. Secondly, extract the perceptual hashing features of the pre-processing image by using the LoG operator. Finally, the three feature sequences are concatenated to obtain the hash sequence of the image. Experimental results show that the proposed method outperforms other popular pHash algorithms in terms of uniqueness, differentiation, and robustness which means it can improve the effect of image retrieval.
感知哈希(pHash)算法生成一个唯一的图像序列。图像的相似性可以通过比较哈希序列之间的距离来确定。本文提出了一种新的pHash方法。首先,将预处理后的图像进行NSCT分解为高频和低频部分,提取高频的Zernike矩和低频的LBP特征;其次,利用LoG算子提取预处理图像的感知哈希特征;最后,将三个特征序列连接起来,得到图像的哈希序列。实验结果表明,该方法在唯一性、差异性和鲁棒性方面优于其他流行的pHash算法,可以提高图像检索的效果。
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引用次数: 0
A new method for detecting binary random sequences in cryptography: First interval test for non-overlapping templates 一种检测密码学中二进制随机序列的新方法:非重叠模板的第一间隔检验
Xia Wu, Sheng Lin
ABSTRACT: In the application of various fields of cryptography, the generation of the key should be random, because it directly determines the security of the system, so the detection of the random generation of the key is a crucial work in cryptography. Different detection methods detect different properties of sequences. The first interval test of non-overlapping templates introduced in this paper is mainly aimed at testing the frequency of the first interval of the specified template in the sequence. When the frequency of the first interval of the specified template conforms to the ideal distribution, the randomness hypothesis is accepted. On the contrary, the specific frequency the template, random hypothesis is rejected. This method focuses more on specifying the interval frequency of the occurrence of the template than some methods of checking the frequency of the occurrence of the template in the whole sequence. In addition, the sequence length examined by this detection method can be short or long. Compared with the random number detection method, the method introduced in this paper is more inclusive.
摘要:在密码学各个领域的应用中,密钥的生成都应该是随机的,因为它直接决定了系统的安全性,所以对密钥随机生成的检测是密码学中的一项至关重要的工作。不同的检测方法检测序列的不同属性。本文介绍的非重叠模板的第一次间隔检验主要是为了检验序列中指定模板的第一次间隔出现的频率。当指定模板的第一个区间的频率符合理想分布时,接受随机假设。相反,具体频率的模板,随机假设被拒绝。这种方法更侧重于指定模板出现的间隔频率,而不是一些检查模板在整个序列中出现频率的方法。此外,这种检测方法检测的序列长度可以是短的,也可以是长的。与随机数检测方法相比,本文引入的方法更具包容性。
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引用次数: 0
Research on Short-term Load Forecasting of Power System Based on Wavelet Denoising and Artificial Neural Network 基于小波去噪和人工神经网络的电力系统短期负荷预测研究
Zihan Liu
Power system short-term load forecasting plays an important role in the reliable, safe and economic operation of power system. Power system load forecasting data is an important basis for power grid planning, scheduling, marketing and other departments. In order to fully mine the effective information in the load data of power system and carry out accurate short-term load forecasting, this paper proposes a Long Short-Term Memory (LSTM) model based on wavelet denoising to build a short-term load forecasting model. Wavelet denoising method is used for data preprocessing, so as to ensure the accuracy of the prediction model, while LSTM is used to achieve high-quality short-term load forecasting of the power system. The method proposed in this paper has the advantages of strong training and learning ability, fast convergence speed, high prediction accuracy and strong adaptability.
电力系统短期负荷预测对电力系统的可靠、安全、经济运行具有重要作用。电力系统负荷预测数据是电网规划、调度、营销等部门的重要依据。为了充分挖掘电力系统负荷数据中的有效信息,进行准确的短期负荷预测,本文提出了一种基于小波去噪的长短期记忆(LSTM)模型来构建短期负荷预测模型。采用小波去噪方法对数据进行预处理,以保证预测模型的准确性,同时采用LSTM方法对电力系统进行高质量的短期负荷预测。本文提出的方法具有训练学习能力强、收敛速度快、预测精度高、适应性强等优点。
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引用次数: 0
Fusion of multispectral and panchromatic images via convolutional sparse representation and morphological filter 基于卷积稀疏表示和形态滤波的多光谱与全色图像融合
Jiao Jiao, Depeng Chen, Shaobo Yu, Xin Guo
Aimed at the lack of the spectral information preservation and the spatial detail injection in fusion of multispectral (MS) and panchromatic (PAN) images, the paper proposed a pansharpening algorithm based on convolutional sparse representation (CSR) and morphological filter (MF) by introducing a recently emerged signal decomposition model known as CSR. Firstly, the PAN and MS images are decomposed to obtain a base layer and a detail layer, respectively. Secondly, the fusion rule of the base layers which based on MF and high-pass modulation (HPM) scheme is proposed to retain more details. For the fusion of detail layers, maximum selection scheme based on activity maps and CSR model are adopted for fusion. Finally, the fusion results of the base layer and detail layer are reconstructed to obtain the final fusion image. The experimental results show that the proposed method is superior to the traditional methods and some current popular fusion methods from the visual effects and the objective indices.
针对多光谱(MS)和全色(PAN)图像融合中光谱信息保存和空间细节注入不足的问题,引入近年来出现的信号分解模型CSR,提出了一种基于卷积稀疏表示(CSR)和形态滤波(MF)的泛锐化算法。首先,对PAN和MS图像进行分解,分别得到一个基础层和一个细节层;其次,提出了基于中频和高通调制(HPM)方案的基础层融合规则,以保留更多的细节;对于细节层的融合,采用基于活动图的最大选择方案和CSR模型进行融合。最后,对基础层和细节层的融合结果进行重构,得到最终的融合图像。实验结果表明,该方法从视觉效果和客观指标两方面都优于传统方法和目前流行的融合方法。
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引用次数: 0
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Proceedings of the 5th International Conference on Computer Science and Software Engineering
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