安全漏洞自动收集系统的设计与实现

提出了一种完善的安全漏洞收集模型。通过引入漏洞自动收集思想,有效地解决了漏洞数据库信息更新不及时,以及漏洞收集效率低等问题。介绍了漏洞自动收集系统的结构框架和功能模块,给出了系统的具体实现。

浅析型钢码垛机自动收集系统的设计与实现

在钢铁企业中,型钢码垛机由于工作效率高,往往被应用于实际生产。型钢码垛机自动收集系统实际上是一种专门用来对型材进行精整码垛的自动化型钢码垛包装收集系统。该系统主要是由以下几个部分组成:自动码垛机、自动打捆机、自动成形装置和以PLC为基础的自动控制系统。通过运行,我们得出了如下的结论:该套系统是可以适应于型钢连轧的生产节奏和不同规格、尺寸的变化范围的,其最明显的特点就是自动化、智能化和高效率等,在这样的系统的帮助下,使工作质量和速度都有所提高,所以有较好的应用前景。本文主要是对该系统做一个简单的介绍,主要是想让更多的工程技术人员,把握其工作原理,以及更好地将其应用于实际的生产和生活中。

封闭式垃圾自动收集系统在某高层住宅区的应用新技术

目前,在一般生活居住区中,垃圾回收仍以分散袋装化,物管人力上楼收集,集中小区某处堆放,再待市政环卫车辆外运模式进行处理。在提倡环保节能、绿色建筑的当今时代,文章就垃圾回收方式,以海南三亚鹿回头半岛某高档住宅区为例,介绍了封闭式垃圾自动收集系统在高层住宅区应用新技术。

气力输送管道垃圾自动收集系统的应用分析

气力输送管道垃圾自动收集系统是应用于社区、生活小区、商旅综合体等范围内的先进的垃圾自动收集系统,可实现商住区生活垃圾的自动化、流程化分类收集。系统采用真空管道以气力输送的方式进行垃圾收集,实现了模块化、集成化的无人值守自动收集控制。

地下式污水泵站砂渣自动收集与提升系统应用探讨

地下式污水泵站的传统砂渣外运方式会给操作人员的健康带来隐患。以青岛某地下式污水泵站为例,日常运行时操作人员无需进入污水泵站内即可完成砂渣的自动收集与提升外运,提出了地下式污水泵站砂渣自动收集与提升系统的设计方案,并对其可行性进行探讨。

瑞典居住区生活垃圾自动化收集系统

说起生活垃圾收集，人们立刻会联想起居住区肮脏不堪的垃圾箱房，一到夏天，垃圾箱房边垃圾成堆，果皮满地，蚊蝇乱舞，臭气冲天。到了凌晨，环卫工人开始车运垃圾，一时马达轰鸣，铁锹叮当，不知干扰了多少居民的清梦……改革开放二十多年，上海居民的居住条件发生了巨大的变化，但是，居住区生活垃圾的收集运输方式依然没有根本的改变。最近，笔者出访北欧，参现了瑞典首都斯得哥尔摩的居住区生活垃圾自动化收集系统－－Centralsug系统，颇受启发。

肠出血性大肠杆菌O157:H7几种检测方法的比较研究

目的 筛选建立一种快速准确检测肠出血性大肠杆菌0157:H7的方法,初步了解在本地区家禽、家畜养殖场和肉类食品中的带菌状况。方法 以自动酶标免疫测试系统(VIDAS)、自动免疫磁珠收集系统(AIMS)与传统常规分离方法进行比较。结果 应用自动免疫磁珠收集系统对79份实样的检测,检出率为6.33％,在4天内能做完全鉴定结果。该法能检出<10cfu/ml模拟样品中的0157:H7,同时选择使用CHROMagar0157琼脂平板的效果要明显优于山梨醇麦康凯(SMAC)琼脂平板。自动酶标免疫测试系统和传统分离方法未检出。结论 以自动免疫磁珠收集系统结合 CHROMagar琼脂平板建立的0157:H7分离方法具有特异性好、敏感性高、快速简便的特点,可以用于0157:H7外环境的监测和食品污染源调查。

城市轨道交通动态客流分配仿真方法研究

根据轨道交通网络存在大量换乘路径的特点,改进深度优先搜索算法得出站点间换乘路径的有效出行时间。基于自动票务收集系统(automatic fare collection system,AFC)数据得到的乘客进出闸机时刻,利用仿真方法确定乘客与列车在时间和路径的接续关系,同时考虑始发乘客和换乘乘客路径选择行为的差异,将二者区分配流。动态更新先到乘客利用换乘路径的出行时间,并以更新后的时间作为后续出发乘客的路径选择依据。结果表明,该仿真方法可以有效反映乘客的出行过程,具有较高的配流精度。

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.

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.

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.

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.

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.

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.

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.

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.

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.

Balancing control of unicycle robot by using sliding control

This paper discusses about balancing control of unicycle robot.Unicycle robot consists of pitch which acts like inverted pendulum and roll which acts like reaction wheel pendulum.The robot which does not have actuator located in yaw axis is made to derive the simple dynamics.Lagrange equation is applied to deriving dynamic equations.Obtained dynamic equations are used to design the sliding mode control.State variables of the designed control are pitch angle and roll angle.Sliding mode control has chattering problem,which is eliminated by using the sigmoid function as switching function.Finally the control performance and eliminated chattering problem is verified by simulation.

Study on Raman and SERS spectra of filter paper and silica gel plate

Raman spectra and surface-enhanced Raman scattering （SERS） spectra of filter paper and silica gel plate are ob- tained at 785-nm excitation wavelength. The results show that filter paper has thirteen Raman lines in 800 - 1 500 cm 1 and silica gel plate has eight lines in the region of 400 - 1 200 cm-I. The frequencies and Raman active modes are assigned. By comparing their Raman spectra and SERS spectra, we find that the silver colloid could repress the Raman intensities of filter paper and silica gel plate, and reduce their effects on the combination of thin-layer chromatographic （TLC） and SERS. Ac- cording to SERS spectra, the bands at 997 cm 1,1 094 cm I ,1 118 cm-1 ,1 336 cm-1 and 1 378 cm-1 for filter paper and the peak of v l [ SO4] symmetric stretching vibration （--1 017 cm-1 ） for silica gel plate also have high intensities, and those lines should be paid enough attention in TLC-SERS.