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Parallel Computing Framework Based on MapReduce and GPU Clusters 基于MapReduce和GPU集群的并行计算框架
Chunlei Xu, Weijin Zhuang
In recent years, driven by hardware technology, the computing power and programmability of GPUs have been rapidly developed. With the characteristics of highly parallel computing, GPUs are no longer limited to daily graphics processing tasks. It begins to involve a wider range of high-performance generalpurpose computing field. One of the hotspots in the field of highperformance parallel computing is MapReduce, a massive data processing framework. Through inexpensive ordinary computer clusters, we can obtain large-scale data computing capabilities that were previously only owned by expensive large servers. However, most existing MapReduce systems run on CPU clusters, and the computing performance of a single node is limited. Therefore, this paper proposes a parallel computing framework based on GPU cluster and MapReduce, and validates the effectiveness of the framework through experiments. Experiments have proven that our framework can complete the work, and it has a significant speedup for large-scale applications.
近年来,在硬件技术的推动下,gpu的计算能力和可编程性得到了迅速发展。gpu具有高度并行计算的特点,不再局限于日常的图形处理任务。它开始涉及更广泛的高性能通用计算领域。海量数据处理框架MapReduce是高性能并行计算领域的热点之一。通过廉价的普通计算机集群,我们可以获得以前只有昂贵的大型服务器才拥有的大规模数据计算能力。然而,现有的MapReduce系统大多运行在CPU集群上,单个节点的计算性能有限。因此,本文提出了一种基于GPU集群和MapReduce的并行计算框架,并通过实验验证了该框架的有效性。实验证明,我们的框架可以完成这些工作,并且对于大规模应用具有显著的加速效果。
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引用次数: 0
Gait Phase Detection of Exoskeleton Robot Based on the Joints Angle of Lower Limb 基于下肢关节角度的外骨骼机器人步态相位检测
Wang Jiang, Jianbin Zheng, Liping Huang
The lower limb exoskeleton robot is a wearable device that enhances the human lower extremity movement ability. And gait phase detection is an important prerequisite for controlling the lower limb exoskeleton robot. Traditional gait phase detection is mostly based on ground contact forces (GCFs) measured by force sensitive resistors (FSRs). However, FSRs will lose its lifespan and accuracy due to the impact force generated by gait. In view of this shortcoming, a gait phase detection method based on the joints angle of lower limb is proposed. Stacked LSTMs was constructed by using joints angle information of lower limb exoskeleton as input and gait phase as output. Through the experimental analysis of the different wearers' gait phase detection results, Stacked LSTMs could effectively detect the gait phase through the joints angle information with an average accuracy rate of 94.1%, which has a certain role in simplifying the exoskeleton robot sensor network.
下肢外骨骼机器人是一种增强人类下肢运动能力的可穿戴设备。步态相位检测是实现下肢外骨骼机器人控制的重要前提。传统的步态相位检测主要基于力敏电阻(FSRs)测量的地面接触力(GCFs)。然而,由于步态产生的冲击力,fsr将失去其使用寿命和准确性。针对这一缺点,提出了一种基于下肢关节角度的步态相位检测方法。以下肢外骨骼关节角度信息为输入,步态相位信息为输出,构建了堆叠LSTMs。通过对不同佩戴者步态相位检测结果的实验分析,堆叠LSTMs能够通过关节角度信息有效检测步态相位,平均准确率达到94.1%,对简化外骨骼机器人传感器网络具有一定的作用。
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引用次数: 1
Determination Method of Effective Rank Degree and Matrix Dimension in SVD De-noising 奇异值分解降噪中有效秩度和矩阵维数的确定方法
Junyao Li, Yalong Yan, Weina Guo, Yangsongyi Su
RF signals are widely used in space telemetry, track and command (TT&C) field. However, in the transmission process, a lot of noise will be introduced due to the interference of equipment components, transmission channel, atmosphere, electromagnetic environment, etc., which will affect the subsequent analysis and processing of the receiving equipment. Based on the singular value decomposition (SVD) method for noise suppression of RF signals, the Letts' criterion method was proposed to determine the effective rank order of singular value sequence (SVS). The effect of SVD on noise suppression in different dimension matrices were compared and analyzed. Main influencing factors were put forward to choose the matrix dimension as a result. Finally, Hankel matrix dimension automatic determination system was built to realize the choice of the matrix dimension. The noise suppression effect was improved by 0.5dB at least which compared with the traditional matrix dimension determination method.
射频信号广泛应用于空间遥测、跟踪和指挥(TT&C)领域。但是,在传输过程中,由于设备部件、传输信道、大气、电磁环境等的干扰,会引入大量的噪声,影响接收设备的后续分析处理。在射频信号奇异值分解(SVD)降噪方法的基础上,提出了确定奇异值序列(SVS)有效阶数的Letts准则法。对比分析了奇异值分解对不同维矩阵的噪声抑制效果。最后提出了影响矩阵维数选择的主要因素。最后建立了汉高矩阵维数自动确定系统,实现了矩阵维数的选择。与传统的矩阵维数确定方法相比,噪声抑制效果至少提高了0.5dB。
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引用次数: 0
Research on Multi-attribute and Group Decision-making Method with Unknown Weight 未知权值的多属性群体决策方法研究
Yang Xie, Gongliang Li, Qingfei Cai
Different attributes and weights of decision-makers are the key information of multi-attribute and group decision making. Aiming at the complete unknown problem of attribute and decision-maker's weight information, this paper proposed a weight calculation method based on triangular intuitionistic fuzzy number, which established a consensus model with reference triangular intuitionistic fuzzy information by similarity degree to calculate attribute and decision-maker weight information. Aiming at the partially unknown problem of attribute and decision-maker's weight, based on the consensus model, linear programming method is used to calculate the attribute and decision-maker's weight information. Combined with the method of TODIM decision based on triangular intuitionistic fuzzy information, it can be applied to scientific decision making in modern enterprise management in many application scenarios, such as known, partially unknown and completely unknown attribute and decision-maker weight.
决策者的不同属性和权重是多属性群体决策的关键信息。针对属性与决策者权重信息完全未知的问题,提出了一种基于三角直觉模糊数的权重计算方法,通过相似度建立了参考三角直觉模糊信息的共识模型来计算属性与决策者权重信息。针对属性和决策者权重部分未知的问题,在共识模型的基础上,采用线性规划方法计算属性和决策者权重信息。结合基于三角直觉模糊信息的TODIM决策方法,可以在属性已知、部分未知、完全未知、决策者权重等多种应用场景下,应用于现代企业管理中的科学决策。
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引用次数: 0
Research on Gait Cycle Recognition with Plantar Pressure Sensors 基于足底压力传感器的步态周期识别研究
Yina Yang, Weidong Gao, Zhenwei Zhao
Accurate gait phase recognition and gait cycle segmentation are the basis for analyzing individual gait. This paper introduces a ground reaction force (GRF) signal analysis method using a portable, wearable gait analysis system. In this paper, we make use of the signal obtained from the 8 pressure sensors, and use fuzzy logic inference to achieve continuous and smooth gait phase recognition. Then, gait cycle segmentation is performed using gait phases by fully considering the internal difference among different people. The proposed gait segmentation algorithm does not need to preset the phase sequence that forms the individual gait, which can detect accurate gait patterns regardless of the users. Experimental results show that the proposed algorithm has 97.2% accuracy that is similar to the traditional gait cycle segmentation method based on the empirical formula.
准确的步态相位识别和步态周期分割是分析个体步态的基础。介绍了一种基于便携式可穿戴步态分析系统的地面反作用力(GRF)信号分析方法。在本文中,我们利用8个压力传感器获得的信号,利用模糊逻辑推理实现连续平滑的步态相位识别。然后,充分考虑不同人之间的内在差异,利用步态相位进行步态周期分割。所提出的步态分割算法不需要预先设定形成个体步态的相位序列,无论使用者是谁,都可以检测出准确的步态模式。实验结果表明,该算法的分割准确率为97.2%,与传统的基于经验公式的步态周期分割方法相当。
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引用次数: 4
Contrabands Detection in X-ray Screening Images Using YOLO Model 利用YOLO模型检测x射线筛查图像中的违禁品
Ju Wu, Huan Shi, Qinxue Wang
With the wide application of X-ray screening machines, the intelligent recognition of contrabands in the X-ray screening images has been paid more and more attention. Contrabands detection in X-ray screening images is a challenging problem in the field of security detection due to the random distribution of the items, which can cause the overlapping the target objects and the other objects. It is difficult to segment the X-ray security images into the different candidate regions which contain different objects by traditional image processing and recognition algorithm. In recent years, YOLO (You only look once, a realtime object detection system) Model was presented which provides a simple framework to predict bounding boxes and class probabilities directly from full images. In this paper, a YOLO based model is used to detect the contrabands in X-ray screening images. The experimental results show that the precision and the recall rate of contrabands detection under simple background are respectively higher than 98 percent and 94 percent. In complex environment, the precision remains above 95 percent, but the recall rate of some kinds of contrabands dropped down to about 70 percent.
随着x射线筛检机的广泛应用,对x射线筛检图像中违禁品的智能识别越来越受到重视。x射线扫描图像中的违禁品检测是安全检测领域的一个难题,因为违禁品的随机分布会导致目标物体与其他物体重叠。传统的图像处理和识别算法难以将x射线安全图像分割成包含不同目标的不同候选区域。近年来提出了YOLO (You only look once,实时目标检测系统)模型,该模型提供了一个简单的框架,可以直接从完整图像中预测边界框和类别概率。本文采用基于YOLO的模型对x射线扫描图像中的违禁品进行检测。实验结果表明,在简单背景下,违禁品检测的准确率和召回率分别高于98%和94%。在复杂的环境下,准确率保持在95%以上,但某些违禁品的召回率下降到70%左右。
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引用次数: 1
Research on the Construction of Control System in Ground Support Facilities at Intelligent Launch Site 智能发射场地面保障设施控制系统建设研究
Wei Dong, Litian Xiao, Gang Lei, Zhaojian Li, Fenglei Zu, Wenyi Zhuang
Intelligent autonomous control and intelligent information application are the main features of an intelligent launch site. The features put forward high demands for the construction of the control system in ground support facilities. The paper analyzes the main characteristics of the ground support control system in the intelligent launch site and the corresponding crucial technical development as well as its application. The construction of ground support control system involved in the crucial technologies that mainly have three aspects: data acquisition and processing, system application and system assessment. The architecture of ground support control system is proposed as a three-dimensional general framework in an intelligent launch site. The architecture is designed by five layers including equipment level, platform level, algorithm level, management level, and application level. Based on the architecture, the operation mechanism of the ground support control systems is presented.
智能自主控制和智能信息应用是智能发射场的主要特征。这些特点对地面保障设施控制系统的建设提出了很高的要求。分析了智能发射场地面保障控制系统的主要特点及相应的关键技术发展和应用。地面保障控制系统建设涉及的关键技术主要有三个方面:数据采集与处理、系统应用和系统评估。提出了智能发射场地面支撑控制系统的三维总体框架结构。该体系结构分为设备层、平台层、算法层、管理层和应用层五个层次。在此基础上,给出了地面支撑控制系统的工作机理。
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引用次数: 0
Bayesian Network Parameter Learning Method Based on AHP/D-S Evidence Theory 基于AHP/D-S证据理论的贝叶斯网络参数学习方法
Shuhuan Wei, Yanqiao Chen, Junbao Geng
Aiming at the problem of prior knowledge acquisition in the process of Bayesian network construction, AHP/D-S evidence theory is introduced into Bayesian network parameter learning. An algorithm that uses AHP/D-S evidence theory to integrate expert prior knowledge, integrates monotonic constraints and near-equal constraints for parameter learning is proposed, and simulation cases are studied. Given corrective expert prior knowledge, the new parameter-learning algorithm overcomes the shortcomings of miscalculation and miscalculation of certain small probability parameters under the condition of small sample set by MLE, and was obviously better than MLE and MAP without prior information. This paper provides a new method for acquiring prior knowledge in the Bayesian network parameter learning process.
针对贝叶斯网络构建过程中存在的先验知识获取问题,将AHP/D-S证据理论引入贝叶斯网络参数学习。提出了一种利用AHP/D-S证据理论整合专家先验知识,结合单调约束和近等约束进行参数学习的算法,并进行了仿真研究。在给定修正专家先验知识的情况下,新的参数学习算法克服了MLE在小样本集条件下对某些小概率参数的误算和误算的缺点,明显优于没有先验信息的MLE和MAP。本文为贝叶斯网络参数学习过程中先验知识的获取提供了一种新的方法。
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引用次数: 1
An Indoor Wi-Fi Positioning Method Based on RSS Matrix Relevance 基于RSS矩阵关联的室内Wi-Fi定位方法
Tao Zheng, Guanping Hua, B. Zhu
According to the time varying of Received Signal Strength (RSS) and the difference of received signal capability among different terminals, which leads to the instability and inaccuracy of Wi-Fi indoor positioning, a novel Wi-Fi positioning method based on RSS matrix correlation is proposed. This method firstly collects Wi-Fi fingerprint data of all reference points in the off-line training stage, constructs an RSS matrix by filtering and sorting the fingerprint data, and records the coordinates of the reference points and the corresponding RSS matrix to establish the off-line location fingerprint database. In the positioning stage, by comparing the RSS matrix correlation between the real-time monitoring and the reference point in the off-line fingerprint database to find the most relevant k reference points, and then estimate the final position of user by weighting centroid algorithm. Experimental results show that this method has better positioning accuracy than the traditional indoor Wi-Fi positioning, and reduce the impact of different terminals on indoor positioning, thus improving the stability of positioning.
针对接收信号强度(RSS)时变以及不同终端之间接收信号能力的差异导致Wi-Fi室内定位不稳定和不准确的问题,提出了一种基于RSS矩阵相关的Wi-Fi室内定位方法。该方法首先采集离线训练阶段所有参考点的Wi-Fi指纹数据,通过对指纹数据进行过滤和排序,构建RSS矩阵,并记录参考点的坐标和对应的RSS矩阵,建立离线位置指纹数据库。在定位阶段,通过比较实时监控与离线指纹数据库中参考点之间的RSS矩阵相关性,找到最相关的k个参考点,然后通过加权质心算法估计用户的最终位置。实验结果表明,该方法比传统的室内Wi-Fi定位具有更好的定位精度,并且减少了不同终端对室内定位的影响,从而提高了定位的稳定性。
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引用次数: 0
Classifying a Limited Number of the Bamboo Species by the Transformation of Convolution Groups 用卷积群变换对有限数量的竹种进行分类
Xiu Jin, Xianzhi Zhu
For agricultural special species, the labeled procedure of large-scale samples is costly, thus, the bamboo species only has a limited number for supervised learning. The fine-tuning strategy is important for deep neural network by transferring learning methods, which utilize the weight of the deep model of the source domain, and can solve the problem associated with insufficient samples to make the model more stability and robustness. In the manuscript, the novelty of the strategy, for images of bamboo species with low-shot classification, mainly proposed an idea that is the transfer of the convolutional group features of deep convolutional models. The deep models with a novel fine-tuning method and three optimizers that are stochastic gradient descent, Adaptive Moment estimation, and Adadelta respectively, are evaluated by the accuracy and the expected calibration error value for the analysis of deep model generalization. An analysis of the results showed that, based on the proportion of training dataset is only 30%, the innovative strategy for bamboo species classification achieved better performance that has an accuracy of 0.82, and the expected calibration error of 0.16, which were better stability and generalization than those of other fine-tuning strategies. Consequently, the novel fine-tuning strategy proposed in this manuscript transfers the features of deep convolutional groups, improves the accuracy and generalizability of the model, and resolves the problems associated with having insufficient samples of bamboo species for low-shot classification.
对于农业特殊物种,大规模样本的标记过程成本较高,因此,用于监督学习的竹物种数量有限。深度神经网络的微调策略是一种重要的迁移学习方法,它利用源域深度模型的权重,可以解决样本不足的问题,使模型更具稳定性和鲁棒性。在本文中,该策略的新颖性,针对竹类图像的低像素分类,主要提出了一种思想,即深度卷积模型的卷积群特征的转移。采用一种新的微调方法和随机梯度下降、自适应矩估计和Adadelta三种优化器分别对深度模型的精度和期望校准误差值进行了评价,用于深度模型泛化分析。结果分析表明,在训练数据占比仅为30%的情况下,创新策略对竹子物种分类的准确率为0.82,预期校准误差为0.16,具有较好的稳定性和泛化性。因此,本文提出的新的微调策略转移了深度卷积群的特征,提高了模型的准确性和泛化性,解决了竹种样本不足进行低采样分类的问题。
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引用次数: 1
期刊
Proceedings of the 4th International Conference on Computer Science and Application Engineering
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