当代设计艺术教育的“道器关联”

设计艺术教育,须注重“道器关联”的作用。“道”与“器”是相互转化、互为依存的辩证关系,如同“鸟之两翼,车之两轮”。须相互补充、转换、同步发展,偏执一隅会影响设计艺术教育的发展和提高。

关联学习:关联关系挖掘新视角

关联关系挖掘与发现是大数据挖掘与分析的重要基础,现有的关联关系挖掘方法多是对数据进行统计分析,对未知数据缺少关联判别作用.尝试从学习的角度进行关联关系挖掘,给出了关联学习的形式化定义和相关概念,并根据关联学习定义构建学习数据集.具体地构建了2类关联图像数据集(two class associated image data sets,TAID),利用卷积神经网络提取关联特征,然后分别用softmax函数和K近邻算法判别关联关系,基于此提出3种关联关系判别器:关联图像卷积神经网络判别器(associated image convolutional neural network discriminator,AICNN)、关联图像LeNet判别器(associated image LeNet discriminator,AILeNet)和关联图像K近邻判别器(associated image K-nearest neighbor discriminator,AIKNN).3种关联判别器在TAID数据集上进行测试,AICNN在64×64像素90000个训练样本上的判别精度达0.8217,AILeNet在256×256像素22500个训练样本上的判别精度达0.8456,AIKNN在256×256像素22500个训练样本上的判别精度达到0.8664.这3种关联判别器有效地证明了学习角度挖掘关联关系的可行性.

接口测试中数据关联技术的运用

接口测试是软件测试工作中重要的组成部分之一,同时也是整个测试工作的难点。如何切实提高软件接口测试技术的效率以及检测结果的可靠性,是当前软件测试领域主要研究的内容。在接口测试中,Web后台登录认证机制,可以通过JMeter测试软件中后置处理器的正则表达式提取器,提取登录身份验证信息token值,从而进行数据关联来实现登录状态保持。

深溪沟水电站发电机保护装置改造与应用实践

发电机保护装置是保障发电厂机组安全平稳运行的重要设备,通过采集发电机各个节点的电压、电流、阻抗、无功功率、有功功率等电气参量,以及断路器位置、导水叶位置等机械参量,结合保护装置内部逻辑和根据用户自身需求对发电机进行保护。发电机保护的应用极大提升了一次设备的安全性,防止因设备故障或人的不安全行为造成一次设备损坏,在保障人员安全和资产安全上发挥着不可替代的作用。随着生产现场的复杂性和电网安全的重要性不断提升,发电机保护装置需要进行升级改造,本文主要结合深溪沟水电站发电机保护装置升级改造进行探讨分析,向并网水电站保护装置升级改造提供参考。

体全息子波关联记忆器

基于子波匹配相关理论和光折变晶体的体全息关联存储特性 ,提出并实现了一个关联记忆的新构思。该系统可根据缺损特征实现原始图像的记忆和恢复 ,其中光折变晶体兼作图像识别时的运算单元和图像恢复时的存储单元。文中以人脸为研究对象 。

基于方向权重的广域后备保护跳闸策略

在故障元件已被有限广域集中式后备保护识别的基础上,提出一种基于方向权重的广域保护跳闸策略。根据网络拓扑及本区域内正序电流相量信息,构造基于方向权重的节点-支路关联矩阵,然后根据故障判别结果和断路器失灵判别结果构造元件-断路器关联度向量,并通过关联度向量识别并跳开关联断路器。仿真结果表明,所提方法简化了后备保护的配合关系,且能够在最小范围内切除故障,对信息同步没有严格要求,在断路器信息部分缺失时也有很好的适用性及可靠性。

数据挖掘在领退料管理系统中应用

研究了领料管理系统中存在的各种退料的原因和解决的方法,设计了一种考虑多种退料方式的领料系统架构,开发了一个关联规则的挖掘器,通过对系统所记录的各种退料原因的数据挖掘,得到了设计、工艺、材质存在的缺陷的原因,为提高设计质量、加工质量、节省成本提供了有力的支持。

Trispectrum and correlation dimension analysis of magnetorheological damper in vibration screen

In order to improve the screening efficiency of vibrating screen and make vibration process smooth,a new type of magnetorheological (MR) damper was proposed. The signals of displacement in the vibration process during the test were collected. The trispectrum model of autoregressive (AR) time series was built and the correlation dimension was used to quantify the fractal characteristics during the vibration process. The result shows that,in different working conditions,trispectrum slices are applied to obtaining the information of non-Gaussian,nonlinear amplitude?frequency characteristics of the signal. Besides,there is correlation between the correlation dimension of vibration signal and trispectrum slices,which is very important to select the optimum working parameters of the MR damper and vibrating screen. And in the experimental conditions,it is found that when the working current of MR damper is 2 A and the rotation speed of vibration motor is 800 r/min,the vibration screen reaches its maximum screening efficiency.

Can coordination variability identify performance factors and skill level in competitive sport? The case of race walking

Background:Marginal changes in the execution of competitive sports movements can represent a significant change for performance success.However,such differences may emerge only at certain execution intensities and are not easily detectable through conventional biomechanical techniques.This study aimed to investigate if and how competition standard and progression speed affect race walking kinematics from both a conventional and a coordination variability perspective.Methods:Fifteen experienced athletes divided into three groups(elite,international,and national) were studied while race walking on a treadmill at two different speeds(12.0 and 15.5 km/h).Basic gait parameters,the angular displacement of the pelvis and lower limbs,and the variability in continuous relative phase between six different joint couplings were analyzed.Results:Most of the spatio-temporal,kinematic,and coordination variability measures proved sensitive to the change in speed.Conversely,non-linear dynamics measures highlighted differences between athletes of different competition standard when conventional analytical tools were not able to discriminate between different skill levels.Continuous relative phase variability was higher for national level athletes than international and elite in two couplings(pelvis obliquity—hip flex/extension and pelvis rotation—ankle dorsi/plantarflexion) and gait phases(early stance for the first coupling,propulsive phase for the second) that are deemed fundamental for correct technique and performance.Conclusion:Measures of coordination variability showed to be a more sensitive tool for the fine detection of skill-dependent factors in competitive race walking,and showed good potential for being integrated in the assessment and monitoring of sports motor abilities.

Passive target tracking with intermittent measurement based on random finite set

In the tracking problem for the maritime radiation source by a passive sensor,there are three main difficulties,i.e.,the poor observability of the radiation source,the detection uncertainty(false and missed detections)and the uncertainty of the target appearing/disappearing in the field of view.These difficulties can make the establishment or maintenance of the radiation source target track invalid.By incorporating the elevation information of the passive sensor into the automatic bearings-only tracking(BOT)and consolidating these uncertainties under the framework of random finite set(RFS),a novel approach for tracking maritime radiation source target with intermittent measurement was proposed.Under the RFS framework,the target state was represented as a set that can take on either an empty set or a singleton; meanwhile,the measurement uncertainty was modeled as a Bernoulli random finite set.Moreover,the elevation information of the sensor platform was introduced to ensure observability of passive measurements and obtain the unique target localization.Simulation experiments verify the validity of the proposed approach for tracking maritime radiation source and demonstrate the superiority of the proposed approach in comparison with the traditional integrated probabilistic data association(IPDA)method.The tracking performance under different conditions,particularly involving different existence probabilities and different appearance durations of the target,indicates that the method to solve our problem is robust and effective.

Quantum Secure Direct Intercommunication with Superdense Coding and Entanglement Swapping

A quantum secure direct intercommunication scheme is proposed to exchange directly the communicators＇ secret messages by making ase of swapping entanglement of Bell states. It has great capacity to distribute the secret messages since these messages have been imposed on high-dimensional Bell states via the local unitary operations with superdense coding. The security is ensured by the secure transmission of the travel sequences and the application of entanglement swapping.

Long-term Observation of Nighttime Clouds over Sao Joao do Cariri （7.4° S, 36.5° W）

Using images collected by an all sky imager deployed in Sao Joao do Cariri （7.4° S, 36.5° W） from September 2000 to November 2010, the nighttime incidence of clouds has been observed and studied. Most of the nighttime cloudy occurred from February to July, which is related to the rainy season in the area of the observatory. The best period to run optical observations over Sao Joao do Cariri starts in the early night up to 22：00 LT （Local Time） throughout the period between August and December. An anti-correlation between the F10.7 cm solar flux index and the number of cloudy nights was observed, which is an evidence of the cosmic rays activity in the lower earth＇s atmosphere. The location of the all-sky imager provides reliable optical observations all year through.

Simulation of Dynamic Electromagnetic Interference Environment for Unmanned Aerial Vehicle Data Link

In order to test the anti-interference ability of an Unmanned Aerial Vehicle(UAV) data link in a complex electromagnetic environment,a method for simulating the dynamic electromagnetic interference of an indoor wireless environment is proposed.This method can estimate the relational degree between the actual face of an UAV data link in an interface environment and the simulation scenarios in an anechoic chamber by using the Grey Relational Analysis(GRA) theory.The dynamic drive of the microwave instrument produces a real-time corresponding interference signal and realises scene mapping.The experimental results show that the maximal correlation between the interference signal in the real scene and the angular domain of the radiation antenna in the anechoic chamber is 0.959 3.Further,the relational degree of the Signal-toInterference Ratio(SIR) of the UAV at its reception terminal indoors and in the anechoic chamber is 0.996 8,and the time of instrument drive is only approximately 10 μs.All of the above illustrates that this method can achieve a simulation close to a real field dynamic electromagnetic interference signal of an indoor UAV data link.

Multi-dimensional and Multi-threshold Airframe Damage Region Division Method Based on Correlation Optimization

In order to obtain the image of airframe damage region and provide the input data for aircraft intelligent maintenance,a multi-dimensional and multi-threshold airframe damage region division method based on correlation optimization is proposed.On the basis of airframe damage feature analysis,the multi-dimensional feature entropy is defined to realize the full fusion of multiple feature information of the image,and the division method is extended to multi-threshold to refine the damage division and reduce the impact of the damage adjacent region’s morphological changes on the division.Through the correlation parameter optimization algorithm,the problem of low efficiency of multi-dimensional multi-threshold division method is solved.Finally,the proposed method is compared and verified by instances of airframe damage image.The results show that compared with the traditional threshold division method,the damage region divided by the proposed method is complete and accurate,and the boundary is clear and coherent,which can effectively reduce the interference of many factors such as uneven luminance,chromaticity deviation,dirt attachment,image compression,and so on.The correlation optimization algorithm has high efficiency and stable convergence,and can meet the requirements of aircraft intelligent maintenance.

Clearance Effects in Parallel Manipulators： Position Error Discontinuities and Inertial Effects Influence

Clearances at joints cause an uncertainty in the actual posture of the end-effector of any mechanism. This uncertainty relays on the clearance dimension and the way these clearances are taken up by the mechanism under the load and the inertial effects at every instant. As a matter of fact, the actual measure of the pose error is often replaced by an uncertainty measure. However, a side effect of the existence of clearances is that they can cause sudden changes in the posture of the mechanism as a motion is performed. Such discontinuities in the position produce task defects and impacts. In this work a tool to determine the pose error due to clearances is presented together with a discontinuity analysis. In addition, effects of mass distribution and inertial effects on such discontinuities are expounded, taking a 3-PRS robot as example.

High Speed Column-Parallel CDS/ADC Circuit with Nonlinearity Compensation for CMOS Image Sensors

A high speed column-parallel CDS/ADC circuit with nonlinearity compensation is proposed in this paper.The correlated double sampling (CDS) and analog-to-digital converter (ADC) functions are integrated in a threephase column-parallel circuit based on two floating gate inverters and switched-capacitor network.The conversion rate of traditional single-slope ADC is speeded up by dividing quantization to coarse step and fine step.A storage capacitor is used to store the result of coarse step and locate the section of ramp signal of fine step,which can reduce the clock step from 2 n to 2 (n/2+1).The floating gate inverters are implemented to reduce the power consumption.Its induced nonlinear offset is cancelled by introducing a compensation module to the input of inverter,which can equalize the coupling path in three phases of the proposed circuit.This circuit is designed and simulated for CMOS image sensor with 640×480 pixel array using Chartered 0.18μm process.Simulation results indicate that the resolution can reach 10-bit and the maximum frame rate can reach 200 frames/s with a main clock of 10MHz.The power consumption of this circuit is less than 36.5μW with a 3.3V power supply.The proposed CDS/ADC circuit is suitable for high resolution and high speed image sensors.

A 0.18μm CMOS GAIN-SWITCHED LNA AND MIXER WITH LARGE DYNAMIC RANGE

A 2.4GHz 0.18μm CMOS gain-switched single-end Low Noise Amplifier （LNA） and a passive mixer with no external balun for near-zero-IF （Intermediate Frequency）/RF （Radio Frequency） applications are described. The LNA, fabricated in the 0.18μm 1P6M CMOS technology, adopts a gain-switched technique to increase the linearity and enlarge the dynamic range. The mixer is an IQ-based passive topology. Measurements of the CMOS chip are performed on the FR-4 PCB and the input is matched to 50Ω. Combining LNA and mixer, the front-end measured performances in high gain state are： -15dB of Sll, 18.5dB of voltage gain, 4.6dB of noise figure, 15dBm of IIP3, 85dBm to -10dBm dynamic range. The full circuit drains 6mA from a 1.8V supply.

Sulfur poisoning mechanism of three way catalytic converter and its grey relational analysis

Combining a detailed catalytic surface reaction mechanism with noble metal and promoter elementary reactions, a new three-way catalytic converter(TWC) reaction mechanism is established. Based on the new mechanism, steady condition numerical simulation is carried out, and the change of light-off temperatures and conversion efficiency with various SO2 contents is obtained. By grey relational analysis(GRA), the relational grade between conversion efficiency and SO2 content is obtained. And, the result shows that SO2 content has the most important influence on C3H6 and NOX conversion efficiency. This provides an important reference to the improvement of activity design of TWC, and may provide guidance for the condition design and optimization of TWC.