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2009 International Conference on Environmental Science and Information Application Technology最新文献

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Time series prediction of heavy metal contamination in mining areas based on exponential smoothing model 基于指数平滑模型的矿区重金属污染时间序列预测
Yunzhang Rao, Shuitai Xu, Lingyan Xiong
Heavy metal contamination in mining areas has the features of time series, so it can be predicted with exponential smoothing model. On the basis of 1995–2007 monitoring data of Copper (Cu) at the surface water monitoring point 500m to the downstream of the sewage outlet in a copper ore, with cubic exponential smoothing method, the predicting model of heavy metal Cu is established through selecting different smoothing coefficient a. After applying the predicting model to predicting the content of Cu in the wastewater 500m to the sewage outlet from 2005 to 2007, it is found that the error of comparing the predicted result with correspondent actual monitoring values is less than 5%, which satisfies the requirements after testing. The predicting result shows that the mining area will be still in the contamination of Cu in the future.
矿区重金属污染具有时间序列特征,可以用指数平滑模型进行预测。根据某铜矿排污口下游500m地表水监测点1995-2007年的铜(Cu)监测数据,采用三次指数平滑法,通过选择不同的平滑系数a,建立了重金属Cu的预测模型。将该预测模型应用于2005 - 2007年对排污口下游500m废水中Cu含量的预测。结果表明,预测结果与相应的实际监测值比较误差小于5%,满足了试验要求。预测结果表明,矿区今后仍将处于铜污染状态。
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引用次数: 1
A new albedo model constructed for stochastic resonance simulation on 100ka climate cycle 100ka气候周期随机共振模拟的新反照率模型
Mingkeng Duan
In the research on stochastic resonance, the albedo model is the most important issue. Based on the new geological evidence and observational data, combining with the classical albedo model, A new albedo model is built for the 100ka climate cycle. Using the new albedo model, a lot of stochastic resonance simulations is carried out. The results shows that when the noise intensity in earth-atmosphere system is about 0.25–0.37, the stochastic resonance will happen with the cycle of 10°C temperature amplitude. These simulation results is in accordance with the climate change facts and Benzi's research. It also proves that the new albedo model is reliable and useful.
在随机共振的研究中,反照率模型是最重要的问题。基于新的地质证据和观测资料,结合经典反照率模型,建立了100ka气候周期的新反照率模型。利用新的反照率模型,进行了大量的随机共振模拟。结果表明:当地-气系统噪声强度约为0.25 ~ 0.37时,以10℃温度幅值为周期发生随机共振;这些模拟结果符合气候变化事实和Benzi的研究。验证了新反照率模型的可靠性和实用性。
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引用次数: 0
Channel isolation and range sidelobe suppression for instantaneous full-polarization radar 瞬时全极化雷达的信道隔离和距离旁瓣抑制
Xiongjun Fu, Honghua Yan, Lizhi Zhao, Cai Wang, M. Gao
Polarization is quite useful for target detection and identification since it is an intrinsic property of targets. The real polarization scattering matrix (PSM) namely Sinclair scattering matrix must be acquired by instantaneous full polarization measurements. For the requirement of full polarization measurement to radar targets instantaneously, a solution to the two key issues on channel isolation and sidelobe suppression is proposed here from the perspective of waveform design and echo processing. The required waveform characteristics for instantaneous full polarization radar and the demands of sidelobe suppression performance were reviewed. Channel isolation is guaranteed by orthogonal Waveform Design, and the performance of auto-correlation and Doppler tolerance is obtained at the same time. A novel signal transmission guideline is designed based on comprehensive utilization of positive and negative chirp rate linear frequency-modulation (LFM) waveform and orthogonal phase-coded waveform hopping pulse to pulse randomly. Effective sidelobe reduction is achieved by inter-pulse information processing. What's more, the signal-to-noise ratio (SNR) and the performance of low probability of intercept radar are improved simultaneously.
极化是目标的固有特性,在目标检测和识别中非常有用。实极化散射矩阵即辛克莱散射矩阵必须通过瞬时全极化测量得到。针对实时对雷达目标进行全极化测量的要求,从波形设计和回波处理的角度,提出了通道隔离和旁瓣抑制两个关键问题的解决方案。综述了瞬时全极化雷达所需的波形特性和对旁瓣抑制性能的要求。通过正交波形设计保证了信道隔离,同时获得了自相关性能和多普勒容忍性能。综合利用正负啁啾率线性调频(LFM)波形和脉冲随机跳频的正交相位编码波形,设计了一种新的信号传输准则。通过脉冲间信息处理实现了有效的旁瓣抑制。同时提高了低概率拦截雷达的信噪比和性能。
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引用次数: 0
Study on DC resistance and AC steady-state characteristics of the Pericardium Meridian on skin surface 皮肤表面心包经络的直流电阻和交流稳态特性研究
Cenyu Huang, Yuhang Wang, Xiaoying Lux0308, Zhigong Wang
Although acupuncture is studied by lots of scientists all over the world, the mechanism of its function is not clear yet. This paper describes the research history of Chinese meridian theory first. Then the method of electronic information science is applied to study the specificity of the signal transmission along human Pericardium Meridian. Certain points on the Pericardium are selected, and a special electrode array is implemented to study the resistance and the AC steady-state characteristics. Furthermore, digital signal processing methods are used to analyze the waveform to compare the spectrum of the signal of meridian and non-meridian under the same stimulating. The conclusion and prospect will be presented in the end of this paper.
虽然世界上许多科学家对针灸进行了研究,但其作用机制尚不清楚。本文首先介绍了中国经络理论的研究历史。然后应用电子信息科学的方法研究了信号沿人体心包经络传输的特异性。在心包上选择一定的点,采用特殊的电极阵列来研究电阻和交流稳态特性。在此基础上,采用数字信号处理方法对波形进行分析,比较在相同刺激下,经络信号与非经络信号的频谱。最后,对全文进行了总结和展望。
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引用次数: 2
Matching decision model for self- adaptability of knowledge manufacturing system 知识制造系统自适应匹配决策模型
Yufang Wang, Hongsen Yan, X. Meng
Knowledge manufacturing system has the ability of modifying dynamically manufacturing mode rapidly when production environment factors change. It is essential to evaluate the matching degree of established manufacturing mode and changed production environment factors. In this paper, a matching decision model for self-adaptability of knowledge manufacturing system based on the fuzzy neural network is proposed. The changed production environment factors are regarded as linguistic variable inputs. A modified momentum factor B-P algorithm consisting of information feed-forward process and the error back-propagation process is used. The proposed FNN model is employed to evaluate the matching degree of a car-lamp production manufacturing mode to variable environment units. Matching result indicates adaptive degree of manufacturing system. Experiment result demonstrates the method is effective.
知识制造系统具有随着生产环境因素的变化而快速动态修改制造模式的能力。评价已建立的制造模式与变化的生产环境要素的匹配程度是至关重要的。提出了一种基于模糊神经网络的知识制造系统自适应匹配决策模型。变化的生产环境因素被视为语言变量输入。采用了一种由信息前馈过程和误差反向传播过程组成的改进动量因子B-P算法。将所提出的模糊神经网络模型用于评价汽车灯生产制造模式与可变环境单元的匹配程度。匹配结果表明了制造系统的自适应程度。实验结果表明,该方法是有效的。
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引用次数: 5
Comparison of three group ICA methods for multi-subject fMRI data analysis 三组ICA方法在多主体fMRI数据分析中的比较
Mingqi Hui, L. Yao, Zhi-ying Long
Since spatial independent component analysis (sICA) was introduced to fMRI data analysis of single subject by Mckeown (1998), several group ICA approaches including subject-specific ICA, across-subject averaging, temporal/spatial concatenation and tensor probabilistic ICA (PICA) have been proposed to generate group inference over a group of subjects. By far, the subject-specific ICA, temporal concatenation method and tensor PICA have been applied to fMRI data analysis. Among the three methods, both temporal concatenation method and tensor PICA are the most widely used. However, there hasn't been any comparison of subject-specific ICA, temporal concatenation method and tensor PICA. The current study aims at comparing the three group ICA methods at various noise levels. Simulated experiment based on human resting fMRI data revealed that tensor PICA provided the best overall performance due to the highest spatial detection power and relatively more accurate estimation of time course. Temporal concatenation method provided moderate performance in terms of relatively higher spatial detection power and simpler algorithm. Subject-specific method showed the worst spatial detection power and was the most time consuming in component selection.
自从Mckeown(1998)将空间独立分量分析(sICA)引入到单个受试者的fMRI数据分析中以来,已经提出了几种群体ICA方法,包括特定受试者ICA、跨受试者平均、时空连接和张量概率ICA (PICA),以对一组受试者进行群体推理。到目前为止,受试者特异性ICA、时间串联法和张量PICA已被应用于fMRI数据分析。在这三种方法中,时间级联法和张量PICA是应用最广泛的方法。然而,目前还没有对受试者特异性ICA、时间串联法和张量ICA进行比较。本研究旨在比较不同噪声水平下的三组ICA方法。基于人类静息fMRI数据的模拟实验表明,PICA张量具有最高的空间检测能力和相对更准确的时间过程估计,具有最佳的综合性能。时间级联方法具有较高的空间检测能力和较简单的算法,性能适中。受试者特异性方法的空间检测能力最差,且在成分选择上耗时最多。
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引用次数: 1
Study on nonlinear friction compensation for bi-axis servo system based-on ADRC 基于自抗扰控制器的双轴伺服系统非线性摩擦补偿研究
Xiao Benxian, Wang Ping, Dong Xueping, Z. Xingpeng, Yue Haibin
In view of the friction nonlinearity and uncertain external disturbance in the bi-axis servo system, on the basis of analyzing the contour error of the system, combined with the cross-coupling control idea, an improved second-order Active Disturbance Rejection Controller (ADRC) was proposed. The inner disturbance and outside disturbance of the system, as well as the friction could be observed and compensated by the high-gain extended state observer (ESO) of ADRC, which has strong robustness. Due to proposing a new nonlinear function to overcome the rough of conventional nonlinear function in the nonlinear state error feedback of conventional ADRC, so the system is un-sensitive to the friction. The simulation and comparison analysis indicate that the system based on improved ADRC can well compensate the nonlinear friction, and has better robustness, so the contour error can be also reduced.
针对双轴伺服系统中存在的摩擦非线性和不确定外部干扰,在分析系统轮廓误差的基础上,结合交叉耦合控制思想,提出了一种改进的二阶自抗扰控制器(ADRC)。ADRC的高增益扩展状态观测器(ESO)可以对系统的内外扰动以及摩擦进行观测和补偿,具有较强的鲁棒性。由于提出了一种新的非线性函数,克服了传统自抗扰控制器非线性状态误差反馈中传统非线性函数的粗糙性,使系统对摩擦不敏感。仿真和对比分析表明,基于改进自抗扰控制器的系统能够很好地补偿非线性摩擦,具有较好的鲁棒性,从而减小了轮廓误差。
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引用次数: 4
Research of overall program on highway toll collection system 高速公路收费系统总体方案研究
Zhang Juan, X. Jianjun
Because the highway has become more and more important in modern road network and the traditional manual toll collection has clearly exposed its weakness, non-stop automatic toll collection is now imperative in highway systems. With the advent of the intelligent transportation systems (ITS), the establishment of electronic toll collection system (ETC) by using of computer technology, electronic technology and modern communication technology, etc, to provides some solutions to the traffic jam, delay and some other problems, can radically enhance the safety and efficiency of road operation and achieve safe road traffic environment. This article has deeply analyzed the networking toll collection management system, including network structure, system framework, and safty and reliability guaranty of the system, etc. The program will provide a reference to non-stop toll collection system of the highway.
由于高速公路在现代公路网中的地位越来越重要,传统的人工收费方式已明显暴露出其不足之处,不间断自动收费在高速公路系统中势在必行。随着智能交通系统(ITS)的出现,利用计算机技术、电子技术和现代通信技术等建立电子收费系统(ETC),为解决交通堵塞、延误等问题提供一些解决方案,可以从根本上提高道路运营的安全性和效率,实现安全的道路交通环境。本文对网络化收费管理系统进行了深入的分析,包括网络结构、系统框架、系统的安全可靠性保障等。该方案将为高速公路不间断收费系统提供参考。
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引用次数: 8
On the explanation of spatial smoothing in MUSIC algorithm for coherent sources 相干源MUSIC算法中空间平滑的解释
Qing Chen, Ruolun Liu
This paper presents the necessity analysis and the sufficiency analysis of DOA estimation in coherent situation by means of three different aspects respectively, including the rank of covariance matrix, the correlation coefficient and the phase difference between coherent sources. The analyses explain how spatial smoothing decorrelates the coherent sources and how many times of spatial smoothing are needed to decorrelate completely. Simulation results illustrate the sensitivity of the MUSIC algorithm to the number of spatial smoothing.
本文分别从协方差矩阵的秩、相关系数和相干源之间的相位差三个不同的方面对相干情况下的DOA估计进行了必要性分析和充分性分析。分析了空间平滑如何去相关相干源,以及需要多少次空间平滑才能完全去相关。仿真结果表明MUSIC算法对空间平滑次数的敏感性。
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引用次数: 23
Notice of RetractionAn empirical study on features and the preventive strategies of tourism crime in China's small and medium-sized cities 中国中小城市旅游犯罪特征及防范策略实证研究
Xiangrui Sang, Chuanyi Li, Wenbin Shang
As an international problem, tourism crime is now becoming more and more serous. This paper is an empirical study of tourism crimes in Xianning, a newly-emerging tourist city in Hubei Province. By analyzing the cases of tourism crime from 2004 to 2008, it summarizes features of tourism crime as follows: tourism crime rate increases with the development of tourism; types of crimes vary from place to place; tourism crimes mainly occur during the traveling process; tourism crimes have remarkable seasonal features; most tourism crimes are property oriented; Tourism crime aims mainly at tourists; the non-violent offence is the major form, etc. An empirical study on the features and preventive strategies of tourism crime, on one hand, theoretically is good for the establishment of tourism criminology and for the development of tourism study, criminology and other subjects; on the other hand, it can be practically served as a guide to prevent tourism crimes and benefit the sustainable development of tourism industry.
旅游犯罪作为一个国际性问题,日益严重。本文以湖北省新兴旅游城市咸宁的旅游犯罪为实证研究对象。通过对2004 ~ 2008年旅游犯罪案例的分析,总结出旅游犯罪的特点:随着旅游业的发展,旅游犯罪率呈上升趋势;各地的犯罪类型各不相同;旅游犯罪主要发生在旅游过程中;旅游犯罪具有显著的季节性特征;大多数旅游犯罪是财产犯罪;旅游犯罪主要针对旅游者;非暴力犯罪是犯罪的主要形式,等等。对旅游犯罪的特征和预防策略进行实证研究,一方面在理论上有利于旅游犯罪学的建立,有利于旅游学、犯罪学等学科的发展;另一方面,对预防旅游犯罪具有指导意义,有利于旅游业的可持续发展。
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引用次数: 1
期刊
2009 International Conference on Environmental Science and Information Application Technology
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