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2011 3rd International Conference on Awareness Science and Technology (iCAST)最新文献

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Adaptive fourth-order tensor beamformer 自适应四阶张量波束形成器
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163176
Xirui Zhang, Zhiwen Liu, Yougen Xu, Xiaofeng Gong
A novel tensor-based beamforming algorithm via multi-translation-invariant vector-sensor array is proposed. Largely different from the traditional ones, the spatial filtering is carried out on both macroscopic scale (between subarrays) and microscopic scale (between sensors of each subarray) in the new algorithm, in order to obtain the beamformer output. With different weight vectors being used in each scale, performance dominance of diverse algorithms can be combined effectively. Moreover, the contraction of covariance tensor implies smoothing operation to reduce the singularity of dual-scale covariance matrices. Consequently, the robustness of proposed algorithm to look direction and element position mismatch is increased in the case of high input-SNR (Signal-to-Noise-Ratio). Theoretical analysis and numerical simulations indicate that Dual-Scale-Combined (DSC) algorithm outperforms traditional beamformer in terms of robustness and convergence rate.
提出了一种基于张量的多平移不变矢量传感器阵列波束形成算法。与传统算法有很大不同的是,新算法在宏观尺度(子阵列之间)和微观尺度(每个子阵列的传感器之间)上进行空间滤波,以获得波束形成器输出。在每个尺度上使用不同的权向量,可以有效地结合不同算法的性能优势。此外,协方差张量的收缩意味着平滑操作,以降低双尺度协方差矩阵的奇异性。因此,在高输入信噪比的情况下,该算法对方向和元素位置失配的鲁棒性得到了提高。理论分析和数值模拟表明,双尺度组合波束形成算法在鲁棒性和收敛速度方面优于传统的波束形成算法。
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引用次数: 2
An indoor location identification system based on neural network and genetic algorithm 基于神经网络和遗传算法的室内位置识别系统
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163139
Yu Shuang Lin, R. Chen, Yu-Cheng Lin
Many researchers have used varied technologies to perform the action of indoor position location tracking. In our research, we will propose methods using RFID tags to perform indoor position location tracking. First, we uses RFID to collect Received Signal Strength (RSS) from reference tags beforehand, and then uses multiple neuro networks models to do the indoor position location learning. Next, genetic algorithm is used to find the weight of each neural network. Finally, when the track tags are set up in indoor environments, they can find the position of neighboring reference tags by using the neuro networks and an arithmetic mean to calculate the position location values; with this method we are able to break figures down to track tag position locations. We conducted this experiment to prove that our methodology can provide better accuracy than the single neural network. We conducted this experiments to test the system performace and accuracy.
许多研究人员使用了各种技术来完成室内位置跟踪的动作。在我们的研究中,我们将提出使用RFID标签进行室内位置跟踪的方法。首先,我们使用RFID预先收集参考标签的接收信号强度(RSS),然后使用多个神经网络模型进行室内位置学习。其次,利用遗传算法求出每个神经网络的权值。最后,当在室内环境中设置跟踪标签时,利用神经网络和算术平均值计算位置定位值,找到邻近参考标签的位置;使用这种方法,我们能够将数字分解为跟踪标签位置。我们进行了这个实验,以证明我们的方法可以提供比单一神经网络更好的准确性。为了测试系统的性能和准确性,我们进行了本次实验。
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引用次数: 15
3D-laser-based visual odometry for autonomous mobile robot in outdoor environments 基于3d激光的户外自主移动机器人视觉里程计
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163127
Yan Zhuang, Shengpeng Yang, Xiaotao Li, Wei Wang
In this paper, we describe a visual odometry algorithm based on a novel 3D range data registration approach for mobile robot. Considering traditional range image's limited adaptability in outdoor environment representation, a Bearing Angle model is used in this paper so that local SIFT (Scale-invariant feature transform) features can be extracted and matched effectively. According to the one-to-one correspondence between Bearing Angle image and raw 3D laser data, we can obtain a group of matching pairs between any two successive laser scans, which can be used to accomplish the 3D range data registration. Compared to the conventional ICP (Iterative Closest Point) algorithm, this approach can greatly improve the performance of scan registration both in computation time and accuracy. Furthermore, no initial rough pose estimation is needed in the registration. The frame-to-frame motion estimate can be performed by using the relative pose estimations resulting from the registration. Finally, experimental results are provided to demonstrate the effectiveness of the proposed visual odometry algorithm during the wheel odometry is unavailable or GPS (Global Positioning System) signal outages.
本文描述了一种基于移动机器人三维距离数据配准方法的视觉里程计算法。针对传统距离图像对室外环境表示适应性有限的问题,本文采用了一种方位角模型,以有效地提取和匹配局部SIFT特征。根据方位角图像与原始三维激光数据的一一对应关系,可以得到任意两次连续激光扫描之间的一组匹配对,用于完成三维距离数据配准。与传统的ICP(迭代最近点)算法相比,该方法在计算时间和精度上都大大提高了扫描配准的性能。此外,在配准中不需要初始的粗略姿态估计。帧间运动估计可以通过使用由配准产生的相对姿态估计来执行。最后,通过实验验证了视觉里程计算法在车轮里程计不可用或GPS(全球定位系统)信号中断时的有效性。
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引用次数: 5
Neural correlates of awareness in brains and in man-made devices 大脑和人造设备中意识的神经关联
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163183
R. Kozma
A dynamical system-based approach to awareness is outlined. Awareness is an important component of intelligence as the system evolves through a sequence dynamical changes upon its interaction with the environment. Awareness is inherently rooted in the individual as a nonlinear system far from equilibrium. Recent cognitive experiments with spatio-temporal neurodynamics indicate large-scale intermittent synchronization-desynchronization effects as important hallmarks of awareness in biological systems. These results serve a mathematical framework to create computationally aware artificial designs.
概述了一种基于动态系统的意识方法。意识是智能的重要组成部分,因为系统在与环境相互作用的过程中经历了一系列动态变化。意识作为一个远离平衡的非线性系统根植于个人。最近的时空神经动力学认知实验表明,大规模的间歇同步-去同步效应是生物系统中意识的重要标志。这些结果为创建计算感知的人工设计提供了数学框架。
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引用次数: 3
Minimal and optimal subsites set of HIV-1 protease cleavage site based on rough set 基于粗糙集的HIV-1蛋白酶裂解位点最小和最优亚位集
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163153
Hui Liu, Xiang Liu, K. Chou
Identifying the cleavage sites in proteins by HIV protease will greatly expedite the pace in searching for proper inhibitors of HIV protease. In this study, we focus on how many subsites are needed for predicting the cleavage sites. Using the rough set theory of information gain and reduct to search for the minimal and optimal subsites set, we found that, instead of the 8-subsite octapeptide model as usually adopted, the 6-subsite hexapeptide model would suffice to obtain equally good or even slightly better results. To verify the conclusion, prediction with the 6-subsite hexapeptide mode and the 8-subsite octapeptide model are both studied. And the predictive rate and ROC curve are also reported. Such a finding not only suggests many tedious labors could be avoided in synthesizing peptide inhibitor candidates, but also implies it would be possible to design smaller peptide drugs based on the distorted key theory.
利用HIV蛋白酶鉴定蛋白质的切割位点将大大加快寻找合适的HIV蛋白酶抑制剂的步伐。在这项研究中,我们关注的是需要多少个子位点来预测裂解位点。利用信息增益和约简的粗糙集理论寻找最小和最优子位点集,我们发现,与通常采用的8子位点八肽模型不同,6子位点六肽模型足以获得同样好的甚至略好的结果。为了验证这一结论,分别对6亚基六肽模型和8亚基八肽模型进行了预测研究。并报道了预测率和ROC曲线。这一发现不仅表明在合成候选肽抑制剂的过程中可以避免许多繁琐的劳动,而且也意味着基于扭曲键理论设计更小的肽药物是可能的。
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引用次数: 0
Aware computing guided by Lmd expression and direct knowledge in spatial language understanding 空间语言理解中以Lmd表达式和直接知识为指导的感知计算
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163164
M. Yokota
Mental Image Directed Semantic Theory (MIDST) has proposed an omnisensory mental image model and its description language Lmd. This language can provide multimedia expressions with intermediate semantic descriptions in predicate logic. This paper describes systematic and efficient computing guided by Lmd expression and 3D map data, here so called direct knowledge of space, in cross-media operation between linguistic and pictorial expressions as spatial language understanding.
心理意象定向语义理论(mid)提出了一种全感觉心理意象模型及其描述语言Lmd。该语言可以在谓词逻辑中提供具有中间语义描述的多媒体表达式。本文描述了以Lmd表达式和三维地图数据为指导,在空间语言理解等语言表达和图像表达的跨媒体操作中,进行系统高效的计算,这里称为空间的直接知识。
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引用次数: 2
A situation aware framework for activity based risk analysis of patient monitoring system 基于活动的病人监护系统风险分析的情境感知框架
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163087
S. Don, Eumin Choi, D. Min
This paper presents a conceptual architecture of activity based risk analysis for monitoring the health status of the patients in their residence. By incorporating the patient records and medical domain knowledge, it will be easy to detect and prevent accidental events immediately even if the patient is not in the hospital. Data are collected using wearable sensors and transmitted to server using a smart phone through internet or mobile network. The received events are filtered, aggregated and predicted based on the concept of Situation Awareness. This gives high level information that can surpass the patient conditions. However, building this high level information is still an open challenge. To demonstrate the feasibility of the proposed system, some application scenarios are considered.
本文提出了一种基于活动的风险分析的概念架构,用于监测患者在其住所的健康状况。通过结合患者记录和医疗领域知识,即使患者不在医院,也可以很容易地立即发现和预防意外事件。使用可穿戴传感器收集数据,并使用智能手机通过互联网或移动网络传输到服务器。接收到的事件根据态势感知的概念进行过滤、聚合和预测。这提供了高水平的信息,可以超越病人的情况。然而,构建这种高级信息仍然是一个公开的挑战。为了证明该系统的可行性,文中还考虑了一些应用场景。
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引用次数: 3
Optimizing and modeling of gas scheduling system in iron and steel enterprises 钢铁企业燃气调度系统的优化与建模
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163119
Bingzhi Gao, Zhilei Wang, Xiaoli Li, Yixin Yin
As the important secondary energy in iron and steel enterprises, the reasonable selection of scheduling model and optimization method of gas is significant for the reduction of gas diffusion and the increase of economic benefits. Considering the production status of an iron and steel enterprise in Hebei Province, a gas scheduling model is derived. Based on this model, a relatively optimal scheduling strategy is given by using simplex method optimization algorithm.
煤气作为钢铁企业重要的二次能源,合理选择调度模型和优化方法对减少煤气扩散、提高经济效益具有重要意义。结合河北省某钢铁企业的生产现状,建立了燃气调度模型。在此模型的基础上,采用单纯形法优化算法给出了一个相对最优的调度策略。
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引用次数: 0
A novel framework for low-light colour image enhancement and denoising 一种新的弱光彩色图像增强和去噪框架
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163088
Wenshuai Yin, Xiangbo Lin, Yi Sun
This article describes a novel framework for low-light colour image enhancement and denoising. To avoid influences from different colour channels, noise reduction and brightness/contrast enhancement are performed in different colour spaces. In the HSI space, the Bilateral filter is used for illumination- and reflection-component separation, and is effective for edge-preservation, halo removal and noise suppression. Brightness/contrast are extrapolated by using a newly designed histogram, where a suppression term based on the statistics of mathematical expectation and standard deviation was added to improve the algorithm's adaptability. Meanwhile, a saturation enhancement function was proposed to ensure more natural colours. In the YCbCr space, based on noise characteristics in low-light images, Gaussian and Median filters were adopted to reduce the noise. Experimental results indicate that the algorithm is effective for low illumination compensation, colour restoration and noise reduction.
本文描述了一种新的弱光彩色图像增强和去噪框架。为避免不同色彩通道的影响,我们在不同的色彩空间进行降噪和亮度/对比度增强。在HSI空间中,双边滤波器用于照明和反射分量分离,并且有效地保持边缘,去除光晕和抑制噪声。采用新设计的直方图外推亮度/对比度,在直方图中加入了基于数理期望和标准差统计的抑制项,提高了算法的适应性。同时,提出了饱和度增强功能,以确保更自然的色彩。在YCbCr空间中,根据低光图像的噪声特征,采用高斯滤波器和中值滤波器进行降噪。实验结果表明,该算法具有较好的低照度补偿、色彩恢复和降噪效果。
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引用次数: 14
A weighted ELRT-based robust spectrum sensing algorithm 一种基于加权elrt的鲁棒频谱感知算法
Pub Date : 2011-09-01 DOI: 10.1109/ICAWST.2011.6163130
Junrong Gu, Wenglong Liu, Sungjeen Jang, J. Kim
Most of current spectrum sensing methods assume the probability density functions (PDFs) about some parameters are known beforehand. However, in most practical applications, the communication environments usually vary with time. The presumed PDF estimated previously might be different from the actual one. It will degrade the performance of most spectrum sensing methods dramatically. In this paper, we propose a robust approach to address this problem. The weighted Empirical Likelihood Ratio Test (ELRT) is an effective method in statistical mathematics which can improve the robustness against the effect of imprecise knowledge of PDF under small sample size. The weighted ELRT obtains the robustness by re-weighting the contributions of actual PDF to likelihood. We employ the weighted ELRT in spectrum sensing, and term this new method as weighted ELRT-based robust spectrum sensing. Simulation results corroborate the performance of the proposed method over those of conventional ones.
目前大多数的频谱传感方法都假定某些参数的概率密度函数是事先已知的。然而,在大多数实际应用中,通信环境通常随时间而变化。先前估计的假定PDF可能与实际PDF不同。这将大大降低大多数频谱传感方法的性能。在本文中,我们提出了一个健壮的方法来解决这个问题。加权经验似然比检验(weighted Empirical Likelihood Ratio Test, ELRT)是统计数学中一种有效的方法,可以提高统计数学在小样本量下对PDF知识不精确影响的稳健性。加权ELRT通过重新加权实际PDF对似然的贡献来获得鲁棒性。我们将加权ELRT用于频谱感知,并将这种新方法称为基于加权ELRT的鲁棒频谱感知。仿真结果验证了该方法优于传统方法的有效性。
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引用次数: 0
期刊
2011 3rd International Conference on Awareness Science and Technology (iCAST)
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