通用综合数据自动收集系统的研制

本文介绍了自动数据采集站的设计原则、设计方法和由若干个自动数据采集站组成通用综合数据自动收集系统的几种方法。

电网规划用电网运行数据自动收集系统设计与实现

随着电网的不断发展,电网系统各类运行数据量急剧增长、数据类型多样,对数据存储、处理、价值挖掘提出了更高要求。针对电力生产数据日益增多及数据结构多种多样发展趋势,怎样才能从大量数据中寻找其中的规律,发现隐藏在数据中有价值的信息,成为当前数据分析工作的难题。同时随着公司信息化建设的稳步推进,在智能电网标准体系建设等方面,对公司信息化建设提出新的要求。为进一步加强主网监控对公司主营业务的提升作用,有效支撑企业信息化及智能电网建设,满足移动信息化应用的稳定性、扩展性、可维护性、安全性等需要,有必要全面开展公司电网规划用电网运行数据自动收集系统建设,利用大数据挖掘技术,发现其潜在生产应用价值。

移动环境下的低开销自动数据收集算法

移动计算的一个重要难题是断连操作.数据收集过程是指在断连前把用户将来可能访问的数据预先存储到本地缓存的过程.收集过程的结果将明显影响断连操作的性能.提出了一种低开销的通用数据收集算法,在访问数据时同步建立数据之间的关联,并在数据关联的基础上自动选择要收集的数据集.模拟试验结果表明,该算法可以有效地提高断连操作时的cache命中率,尤其适用于计算速度慢、存储容量小的手持移动设备.

软件过程中的度量数据收集方法研究

度量数据收集在软件过程改善实践中起着重要作用,但是往往在研究中受到忽视。介绍了软件过程数据收集方法和技术的发展历程,提出了软件过程度量数据收集方法的评价准则,给出了一个软件过程度量数据自动收集的框架,并且列举了四种实现方法。

面向CIMS的物流管理系统

介绍了现代物流技术的现状及功能，针对中小机械企业技术现状，提出通过信息技术建立车间物流、信息流和控制流的集成，给出了企业物流管理的解决方案，并结合实际研究工作，成功应用于自主开发的企业管理软件－制造经理 2000，结果证明该方案是合理可行的，具有实际价值。

保定市空气质量现状及综合治理措施

首先介绍了衡量空气质量的重要指标—空气质量指数以及空气质量指数的计算方法和分级情况.然后根据网络上收集的保定市空气质量数据,使用相关的方法对数据进行了分析,进而给出了空气质量综合治理的措施.最后为了克服当前收集空气质量指数历史数据的困难,介绍了一种自动获取空气质量指数的方法.

煤化工企业成本核算信息系统

通过对煤化工企业成本核算的分析,全面系统地介绍包钢焦化厂成本核算管理信息系统的实施方案和系统特点。通过程序自动收集其它系统的数据,自动实现财务核算,使财务信息达到共享,领导决策层可以随时查询产品的成本占用情况和利润完成情况。

聚焦离子束技术在常温生物样品三维重构方面的方法探讨

聚焦离子束连续切片扫描电镜(focused ion beam serial block face scanning electron microscopy,FIB-SEM)技术,目前已被广泛应用于小体积细胞或组织样品的三维重构,具有自动化程度高、Z轴分辨高等优点。本文从包埋块样品准备与处理、样品区域选定、软件设置前准备、软件参数(离子束加工和电子束扫描)设置、软件运行与图像采集和图像处理等多个方面,详细介绍应用FIB-SEM技术对常温生物包埋块样品进行三维重构的流程和细节,并对某些关键性参数展开讨论。

Object-tracking robot using ultrasonic sensor and servo motor

This paper proposes a method that rotation angle of servo motor and distance values of ultrasonic sensor are used for tracking an object in real-time while the robot keeps regular distance.Object detection distance widens by using ultrasonic sensors and object recognition,and movement of robot is controlled by angle of servo motor and distance of ultrasonic sensors.Not adopting the existing tracking methods:camera,laser-infrared(LRF)and many ultrasonic sensors,the proposed method proves that it is possible to track object using ultrasonic sensor and servo motor.Trajectory of robot is represented and analysed according to movement of object in limited conditions.

New WA-system of kravchenko functions in digital signal processing

On the basis of modified atomic transformations the new WA-systems of Kravchenko functions are constructed.As an example the digital processing of time series of the various physical nature processing is considered.The numerical experiments and physical analysis of the results confirm the efficiency of the proposed WA-systems of Kravchenko functions.

MPPT research based on fuzzy adaptive PID control

In order to improve the efficiency and precision of maximum power point tracking(MPPT)control,a new method is proposed.Based on original MPPT technology of photovoltaic cells,the fuzzy adaptive proportion-integral-differential(PID)control has less fluctuation and higher stability.The simulation circuit using Simulink is established,and output power curves under constant temperature or constant sunlight are obtained.The superiority of the fuzzy PID control method has been proved by means of the simulation results,and it makes the solar system approach maximum power point quickly and smoothly.

射频识别技术及其应用

射频识别技术(RFID)利用射频信号通过空间耦合(交变磁场或电磁场)实现无接触信息传递,并通过所传递的信息达到识别的目的。RFID是当今自动识别数据收集(AIDC)行业发展最快的板块之一,被广泛应用于物流、制造、公共信息服务等行业,可大幅度提高管理与运作效率,降低成本。研究射频识别技术,将之应用到国民生产和生活中去,具有战略性的重大意义。本文对RFID的系统模型、实现原理和实现的关键技术进行了介绍,同生活中的条形码进行了区分,并简述一些应用实例,以加深对RFID的了解和认识。

Identifying uncertainty sources in measurements-A methodology

The overall purpose of performing measurements in science is to increase knowledge and document about some physical quantity. The measurand has a true value but, except for straightforward counting situations, the true value can never be fully determined. When a quantity is measured, the outcome depends on the measuring system, the measurement procedure, the skill of the operator, the environment and other effects. In practice the uncertainty on the result may arise from many possible sources, including examples such as incomplete definition, sampling, matrix effects and interferences, environmental couditions, uncertainties of weights and volumetric equipment, reference wtlues, approximations and assump- tions incorporated in the measurement method and procedure, and random wlriation. The objective of the paper is how to identify the sources of uncertainty in measurement and their importance on the result.

Most relevant weighted filtering with one-step singular correlation recognition

Based on the recognition of one-step singular correlation and the remedying methods obtained before,the correlation properties of the neighborhood pixels and the characteristics of image de-noising were analyzed.A kind of most relevant weighted filtering method based on one-step singular correlation recognition(OSSC-MRWF)was put forward.The simulation experiments were done and the comparison with some commonly used methods under salt-and-pepper noises was made.The results show that the proposed method can not only effectively recognize salt-and-pepper noises and mend up the noise points,but also protect the original information such as the edge details very well.The accuracy and performance indicators are further improved considerably.

A framework of hybrid authentication for link access under MIH environments

A unified hybrid authentication framework was proposed to provide proactive authentication and re-authentication for media independent handover（MIH）-based multi-wireless access. In addition, a specific protocol distributing a hierarchi- cal key after the proactive authentication from key holder to base station has been proposed. The proposed hybrid authenti- cation framework not only performs proaetive authentication with credentials based on Chameleon hashing, which removes the authentication procedures that exchanges messages with a authentication server, but also performs re-authentication with EAP re-authentication protocol（ERP） that distributes the hierarchical key on the basis of the root key generated by the pro- active authentication.

Test on methane flame velocity in horizontal tube with obstacles

To test flame propagation velocity of gas explosion in a horizontal tube,a set of flame velocity testing system is designed.The system is composed of two parts:a horizontal tube used for methane burning and a flame detection system.The effect of obstacles on flame propagation velocity of methane explosion is tested.Methane volume density is 10% in the tube.The obstacle is the circular ring,2 mm thick.Its blockage ratios are 40%,50% and 60%,respectively.The number of obstacles put in the tube is 1,3,5 and 7.Experimental results show that the obstacle has obviously accelerating effect on flame wave of gas explosion.As the number and blockage ratios of the obstacles increase,flame accelerating became more obviously.When there are seven obstacles,the maximum average flame velocity reaches over 351.2 m/s.When the blockage ratio of three obstacles is 60%,the maximum average flame velocity is 238.9 m/s.

Debris Flow in Metropolitan Area - 2011 Seoul Debris Flow

A large number of debris flows occurred simultaneously at around 8:30 to 8:50 a.m.on July 27,2011,at the center of Seoul,Korea.This area is located in the southern part of Seoul and is a densely populated district.As a result of the debris flow event,16 people were killed,30 houses were buried,and 116 houses were damaged around Umyeon Mountain,a relatively small mountain with a height of 312.6 m.Since the debris flow event,field investigations on the initiation and transportation zones of debris flows have been carried out.Rainfall data were collected from the automatic weather stations(AWSs) which are operated by the Korea Meteorological Administration(KMA).Video files recorded by residents were also acquired and used to analyze the flow characteristics of the debris flow.Field investigation shows that about 40 debris flows occurred around Umyeon Mountain and most of the debris flows were initiated by small slope failures.The effects of the precipitation that triggered the debris flows were analyzed as well.A landslide hazard map which considers slope gradient and aspect,strength of soil,hazard record,rainfall conditions,and vegetation,was constructed and compared with the initiation zones of debris flows.

Preparation and characterization of alumina nanoparticles in non-aqueous solution

Nanometer Al2O3powder is prepared by sol-gel method.Trans mission electron microscope(TEM),X-ray diffrac-tion(XRD),ther mal analysis,IR and the grain-testing instructure are used to characterize the particle shape and phase,chemical bonds of hydrous cassiterite andsize distribution after being heated.XRDand TEMshowthat the powder is fibrous γ-Al2O3at800 ℃andsphericalα-Al2O3at1 200℃.The grain-testinginstructure shows that the average particle diameter of γ-Al2O3is36.2nm while that ofα-Al2O3is125.6nm.The IRshows that aluminumstearate is synthesizedin the process of sol-gel.

Information entropy-based estimation of hand and elbow movements using ECoG signals

A method of estimating hand and elbow movements using electrocorticogram （ECoG） signals is proposed. Using multiple channels, surface electromyogram （EMG） signals and ECoG signals were obtained from patients simultaneously. The estimated movements were those to close and then open the hand and those to bend the elbow inward. The patients were encouraged to perform the movements in accordance with their free will instead of after being induced by external stimuli. Surface EMG signals were used to find movement time points, and ECoG signals were used to estimate the movements. To extract the characteristics of the individual movements, the ECoG signals were divided into a total of six bands （the entire band and the ~, 0, a ,fl and 7 bands） to obtain the information entropy, and the maximum likelihood estimation method was used to estimate the movements. The results of the experiment show that the performance averages 74 % when the ECoG of 7 band is used, which is higher than that when other bands are used, and higher estimation success rates are shown in the 7 band than in other bands. The time of the movements is divided into three time sections based on movement time points, and the ＂Before＂ section, which includes the readiness potential, is compared with the ＂Onset＂ section. In the ＂Before＂ section and the ＂Onset＂ section, estimation success rates are 66 % and 65 %, respectively, and thus it is determined that the readiness potential could can be used.

Implementation of motion estimator algorithm with 1/4 pixel accuracy based on FPGA

After research on the motion estimation algorithm in video coding, a motion estimator algorithm with 1/4 pixel ac- curacy is implemented based on fie/d-programmable gate array （FPGA）. The motion estimation algorithm module is made up of the 1[4 pixel interpolation module with serial input and parallel output, the three step search module and the block match- ing module, which can use relatively less Wiener filters for interpolation operation. Experiment results show that the hard- ware design has less consumption of the logical resource, higher stability and lower power consumption.