基于TLBO的工程结构表面缺陷图像边缘检测方法

非接触式、数字化的工程质量检测方法对于快速发现建筑结构表面缺陷,如裂缝、焊接缺陷等,降低工程质量检测的劳动强度具有重要的工程意义。本文在计算机数字图像处理技术基础上,根据建筑结构表面缺陷图像特征,提出基于TLBO算法的缺陷图像轮廓识别预处理方法,作为进一步缺陷特征判断的依据。本文在TLBO算法基础上,边缘像素点的搜索不需要设定任何算法参数,实现简单;提出基于的8个方向的灰度导数,建立图像边缘强度矩阵,将边缘点附近的小规模局部搜索和大量的全局搜索相结合,TLBO算法保证了所提出的边缘检测方法不会陷入局部边缘点,找到最重要的图像全局边缘特征;将TLBO算法应用于图像边缘检测,以工程质量检测中常见的钢结构焊缝检测为例加以验证和分析,证明了本文方法在缺陷图像轮廓识别预处理中的抗噪性和有效性。

Medical Data Clustering and Classification Using TLBO and Machine Learning Algorithms

This study aims to empirically analyze teaching-learning-based optimization(TLBO)and machine learning algorithms using k-means and fuzzy c-means(FCM)algorithms for their individual performance evaluation in terms of clustering and classification.In the first phase,the clustering(k-means and FCM)algorithms were employed independently and the clustering accuracy was evaluated using different computationalmeasures.During the second phase,the non-clustered data obtained from the first phase were preprocessed with TLBO.TLBO was performed using k-means(TLBO-KM)and FCM(TLBO-FCM)(TLBO-KM/FCM)algorithms.The objective function was determined by considering both minimization and maximization criteria.Non-clustered data obtained from the first phase were further utilized and fed as input for threshold optimization.Five benchmark datasets were considered from theUniversity of California,Irvine(UCI)Machine Learning Repository for comparative study and experimentation.These are breast cancer Wisconsin(BCW),Pima Indians Diabetes,Heart-Statlog,Hepatitis,and Cleveland Heart Disease datasets.The combined average accuracy obtained collectively is approximately 99.4%in case of TLBO-KM and 98.6%in case of TLBOFCM.This approach is also capable of finding the dominating attributes.The findings indicate that TLBO-KM/FCM,considering different computational measures,perform well on the non-clustered data where k-means and FCM,if employed independently,fail to provide significant results.Evaluating different feature sets,the TLBO-KM/FCM and SVM(GS)clearly outperformed all other classifiers in terms of sensitivity,specificity and accuracy.TLBOKM/FCM attained the highest average sensitivity(98.7%),highest average specificity(98.4%)and highest average accuracy(99.4%)for 10-fold cross validation with different test data.

基于改进TLBO算法的刮板输送机伸缩机尾PID控制系统优化

为了提高刮板输送机伸缩机尾控制系统的工作性能,将一种新的群智能优化算法,即教学与学习算法(TLBO)应用于机尾PID控制器的参数优化中,并提出新的自适应教学因子计算方法,其利用完整学习阶段前、后学生群体成绩的变化来决定教学因子的取值。研究结果表明:改进后的TLBO算法的精度及稳定性均比原TLBO算法的优。在建立刮板输送机伸缩机尾控制系统模型的基础上,利用改进的TLBO方法进行PID参数整定,并引入超调量控制指标对适应度函数再次完善,二次优化后的刮板输送机伸缩机尾控制系统具有良好控制品质和鲁棒性。

无线传感器网络节点OSFL-TLBO定位算法

定位技术对于无线传感器的应用是至关重要的,没有位置坐标的传感器节点信息是没有意义的。针对非测距的DV-Hop算法定位精度不高的问题,提出了一种新的基于反向蛙跳-教学优化(OSFL-TLBO)定位算法,以改进DV-Hop用平均跳距来代替欧式距离时的累积误差问题和利用最小二乘法求解非线性方程时对初值敏感,受测量误差影响较大的问题。把无线传感器网络节点的定位问题转化为求解最优解的问题。仿真结果表明,所提算法的定位准确度提高大约10%~25%,有效的提高了定位精度。

基于改进TLBO优化LSSVM的风电功率短期预测

为提高风电功率短期预测的精度,提出一种基于改进TLBO优化LSSVM的风电功率短期预测方法。首先对基本TLBO算法中的‘教’阶段进行改进,在采用自适应教学因子的同时改变所有搜索个体的平均值,从而能够自适应的提高TLBO在整个搜索空间的性能;然后改进TLBO算法的‘学’阶段,为维持种群的多样性,避免TLBO算法过早收敛和陷入局部最优,在学习阶段引入高斯变异算子;最后用改进的TLBO优化构建的LSSVM预测模型。以上海北沿风电场和莱州风电场实测数据为例,仿真结果表明,与PSO和TLBO优化LSSVM相比,改进的TLBO优化LSSVM方法对短期风电功率预测具有更好的稳定性和更高的准确性。

一种新的结合奖励机制的ETLBO算法

通过对原ETLBO(elitist teaching-learning-based optimization)算法引入一种新的奖励机制,提出一种新的结合奖励机制的ETLBO-reward算法,并基于该算法提出一种简单自适应的精英个数算法RETLBO-reward,该算法保留了传统算法参数少、易实现、收敛快等优点,进一步提升了传统算法的收敛能力.对6个连续非线性优化问题的测试结果表明,这两种算法均具有良好的性能,求解效率较原ETLBO算法有明显提升.

改进TLBO的相关反馈图像检索方法

针对当前基于进化算法的相关反馈图像检索方法无法很好地结合用户偏好信息和设置参数过多的问题,提出一种基于改进教与学优化的相关反馈图像检索方法。根据图像检索问题的特定环境,对教与学优化算法进行了一系列改进:首先,结合最近邻分类法构造适应度函数的约束条件,使之更好地反映用户偏好信息;其次,通过在教阶段将相关图像集的中心图像作为教师以及在学阶段将相关图像作为学员学习的对象,使算法快速收敛到相关图像区域;最后,结合约束处理技术Deb准则进行学员的选择操作。将该算法与目前效果优异的3种基于进化算法的相关反馈技术在两套标准图像测试集上进行对比。结果表明,所提算法相较于另外3种算法具有明显的优势,能更好地结合用户偏好信息提高图像检索性能。

基于TLBO优化算法的电动汽车充电站选址

随着电动汽车使用规模的不断增加,建设电动汽车充电站已成为当务之急。文中将每个区域中心作为电动汽车充电负荷中心,以分区内电动汽车充电桩数量作为充电站选址的权重系数,建立了充电站位置和定容的优化模型。采用TLBO优化算法计算出电动汽车充电站的数量、建设地点、每个充电站的覆盖范围以及充电站的充电桩数量。仿真结果表明,TLBO优化算法在电动汽车充电站的选址和定容方面,计算准确、收敛速度快,并且具有良好的全局优化性能。

TLBO-ELM模型的番茄灰霉病高光谱潜育期诊断

番茄叶片在感染病害后首先发生的是内在生理反应,肉眼无法观察到。叶片从被感染到出现肉眼可见病斑期间,称为叶片病害潜育期。为了实现番茄叶片表面未见明显病斑的灰霉病潜育期诊断,对接种样本进行叶片编码、跟踪、采集所有编码叶片样本1~8 d连续高光谱图像数据,建立番茄叶片样本时序高光谱数据集。采用跟踪的叶片样本出现肉眼可见病斑前几天同一位置区域的高光谱数据作为潜育期感兴趣区域进行检测分析。为了建立番茄叶片灰霉病潜育期诊断和不同病斑等级分类模型,采用基于教学优化算法(TLBO)优化极限学习机(ELM)的分类模型进行建模。通过TLBO算法优化ELM的输入权值和隐藏层的偏差,提高模型分类性能。利用高光谱成像系统在近红外高光谱波段388~1006 nm波段获取五个等级的感兴趣区域进行数据建模,共采样213个高光谱数据,其中,健康类(56个)、潜育期类(42个)、小病斑类(43个)、大病斑类(39个)和严重类(33个)。通过对比不同的光谱预处理方法,采用效果最好的小波滤波变换(DWT)对样本数据中每类数据分别滤波。DWT滤波后,在610~840 nm波段间五个等级光谱曲线能区分明显,共包含91个波长,波长数量较多。因此,采用竞争性自适应重加权抽样法(CARS)对采用DWT预处理后的光谱数据在610~840 nm波段重复3次优选特征波长,合并去除重复项后得到9个特征波段:694,696,765,767,769,772,778,838和840 nm。最后分别选取全波段FC、610~840 nm波段、CARS提取的9个特征波段建立3个分类模型FC-TLBO-ELM,DWT-TLBO-ELM,DWT-CARS-TLBO-ELM进行对比,其中DWT-CARS-TLBO-ELM检测精确度最高达100%,潜育期召回率100%,利用时间最短为0.0689 s,表明该模型可以实现番茄灰霉病潜育期高精度诊断和灰霉病病害程度高精度分类,为番茄灰霉病早期防治、精准施药提供理论依据。

A Hybrid Approach of TLBO and EBPNN for Crop YieldPrediction Using Spatial Feature Vectors

The prediction of crop yield is one of the important factor and also challenging,to predict the future crop yield based on various criteria’s.Many advanced technologies are incorporated in the agricultural processes,which enhances the crop yield production efficiency.The process of predicting the crop yield can be done by taking agriculture data,which helps to analyze and make important decisions before and during cultivation.This paper focuses on the prediction of crop yield,where two models of machine learning are developed for this work.One is Modified Convolutional Neural Network(MCNN),and the other model is TLBO(Teacher Learning Based Optimization)-a Genetic algorithm which reduces the input size of data.In this work,some spatial information used for analysis is the Normalized Difference Vegetation Index,Standard Precipitation Index and Vegetation Condition Index.TLBO finds some best feature value set in the data that represents the specific yield of the crop.So,these selected feature valued set is passed in the Error Back Propagation Neural Network for learning.Here,the training was done in such a way that all set of features were utilized in pair with their yield value as output.For increasing the reliability of the work whole experiment was done on a real dataset from Madhya Pradesh region of country India.The result shows that the proposed model has overcome various evaluation parameters on different scales as compared to previous approaches adopted by researchers.

TLBO with variable weights applied to shop scheduling problems

The teaching–learning-based optimisation (TLBO) algorithm is a population-based metaheuristic inspired on the teaching–learning process observed in a classroom. It has been successfully used in a wide range of applications. In this study, the authors present a variant version of TLBO. In the proposed version, different weights are assigned to students during the student phase, with higher weights being assigned to students with better solutions. Three different approaches to assign weights are investigated. Numerical experiments with benchmark instances of the flow-shop and the job-shop scheduling problems are carried out to investigate the performance of the proposed approaches. They compare the proposed approaches with the original TLBO algorithm and with two variants of TLBOs proposed in the literature in terms of solution quality, convergence speed and simulation time. The results obtained by the application of a Friedman statistical test showed that the proposed approaches outperformed the original version of TLBO in terms of convergence, with no significant losses in the average makespan. The additional simulation time required by the proposed approaches is small. The best performance was achieved with the approach of assigning a fixed weight to half the students with the best solutions and assigning zero to other students.

An Experimental Investigation into the Amalgamated Al2O3-40% TiO2 Atmospheric Plasma Spray Coating Process on EN24 Substrate and Parameter Optimization Using TLBO

Surface coating is a critical procedure in the case of maintenance engineering. Ceramic coating of the wear areas is of the best practice which substantially enhances the Mean Time between Failure (MTBF). EN24 is a commercial grade alloy which is used for various industrial applications like sleeves, nuts, bolts, shafts, etc. EN24 is having comparatively low corrosion resistance, and ceramic coating of the wear and corroding areas of such parts is a best followed practice which highly improves the frequent failures. The coating quality mainly depends on the coating thickness, surface roughness and coating hardness which finally decides the operability. This paper describes an experimental investigation to effectively optimize the Atmospheric Plasma Spray process input parameters of Al2O3-40% TiO2 coatings to get the best quality of coating on EN24 alloy steel substrate. The experiments are conducted with an Orthogonal Array (OA) design of experiments (DoE). In the current experiment, critical input parameters are considered and some of the vital output parameters are monitored accordingly and separate mathematical models are generated using regression analysis. The Analytic Hierarchy Process (AHP) method is used to generate weights for the individual objective functions and based on that, a combined objective function is made. An advanced optimization method, Teaching-Learning-Based Optimization algorithm (TLBO), is practically utilized to the combined objective function to optimize the values of input parameters to get the best output parameters. Confirmation tests are also conducted and their output results are compared with predicted values obtained through mathematical models. The dominating effects of Al2O3-40% TiO2 spray parameters on output parameters: surface roughness, coating thickness and coating hardness are discussed in detail. It is concluded that the input parameters variation directly affects the characteristics of output parameters and any number of input as well as output parameters can be easily optimized using the current approach.

Parameter Optimization of Amalgamated Al2O3-40% TiO2 Atmospheric Plasma Spray Coating on SS304 Substrate Using TLBO Algorithm

SS304 is a commercial grade stainless steel which is used for various engineering applications like shafts, guides, jigs, fixtures, etc. Ceramic coating of the wear areas of such parts is a regular practice which significantly enhances the Mean Time Between Failure (MTBF). The final coating quality depends mainly on the coating thickness, surface roughness and hardness which ultimately decides the life. This paper presents an experimental study to effectively optimize the Atmospheric Plasma Spray (APS) process input parameters of Al2O3-40% TiO2 ceramic coatings to get the best quality of coating on commercial SS304 substrate. The experiments are conducted with a three-level L18 Orthogonal Array (OA) Design of Experiments (DoE). Critical input parameters considered are: spray nozzle distance, substrate rotating speed, current of the arc, carrier gas flow and coating powder flow rate. The surface roughness, coating thickness and hardness are considered as the output parameters. Mathematical models are generated using regression analysis for individual output parameters. The Analytic Hierarchy Process (AHP) method is applied to generate weights for the individual objective functions and a combined objective function is generated. An advanced optimization method, Teaching-Learning-Based Optimization algorithm (TLBO), is applied to the combined objective function to optimize the values of input parameters to get the best output parameters and confirmation tests are conducted based on that. The significant effects of spray parameters on surface roughness, coating thickness and coating hardness are studied in detail.

An Efficient Hybrid TLBO-PSO Approach for Congestion Management Employing Real Power Generation Rescheduling

In the present deregulated electricity market, power system congestion is the main complication that an independent system operator (ISO) faces on a regular basis. Transmission line congestion trigger serious problems for smooth functioning in restructured power system causing an increase in the cost of transmission hence affecting market efficiency. Thus, it is of utmost importance for the investigation of various techniques in order to relieve congestion in the transmission network. Generation rescheduling is one of the most efficacious techniques to do away with the problem of congestion. For optimizing the congestion cost, this work suggests a hybrid optimization based on two effective algorithms viz Teaching learning-based optimization (TLBO) algorithm and Particle swarm optimization (PSO) algorithm. For binding the constraints, the traditional penalty function technique is incorporated. Modified IEEE 30-bus test system and modified IEEE 57-bus test system are used to inspect the usefulness of the suggested methodology.

改进TLBO算法优化灰色神经网络的ORP预测

在生物氧化提金预处理过程中,由于传统的氧化还原电位预测方法精度不高,该文提出一种改进教与学优化算法(ATLBO)优化灰色神经网络的预测方法。在ATLBO算法中,采用多种群协同学习策略,有效地提高了算法的收敛速度和寻优精度。同时,对各个子种群进行随机交叉操作,大大降低算法陷入局部最优的可能性。运用ATLBO算法优化灰色神经网络(GNN)的参数,并将最优解作为灰色神经网络的输入,对氧化还原电位进行预测。仿真结果表明,与其他预测方法相比,该预测模型能达到较好的预测精度,并且优于其他预测模型。

基于TLBO算法优化的球磨机FBEL控制方案研究

为了提高球磨机控制系统的稳定性和精度,首先将分数阶微积分引入大脑情感学习模型,并把误差信号的分数阶微积分的线性组合作为大脑情感学习模型的感官输入信号和奖励信号,构建一种优化的分数阶大脑情感学习模型参数的方法,然后采用教与学优化算法优化系统的各个参数,使得系统的各个参数更合理,提高了系统的精度,并通过仿真实验验证.仿真结果表明:与传统的一些算法相比较,该方法选取的参数精确度较高,能更快寻找到最优解,具有较好的鲁棒性.

舱段主动隔振系统作动器配置优化

针对舱段主动隔振系统中作动器配置优化问题,给出一种优化模型和方法,通过数值计算进行方法验证。首先建立了多通道舱段主动隔振系统的动力学模型,然后将作动器配置优化转换为约束0-1非线性规划问题,以系统监测点响应为优化目标函数,作动器启用状态为自变量,最后采用教与学优化(teaching and learning-based optimization,TLBO)算法寻找最优配置。仿真计算结果表明,对于不同的激励,多通道主动隔振系统的最优配置不同,即存在对应给定激励下抑制壳体振动与声辐射的最优配置。

基于TLBO-LOIRE的回采工作面瓦斯涌出量预测

瓦斯涌出量是瓦斯防治与管理、矿井通风系统设计的重要基础数据,准确地预测瓦斯涌出量对于煤矿安全生产有着极其重要的指导意义与应用价值.但工作面瓦斯涌出规律复杂,在检测、数据采集过程中不可避免地会混入异常噪声,直接影响着瓦斯预测的准确性.本文采用l1正则化异常值隔离与回归方法(LOIRE)对煤矿回采工作面瓦斯涌出量及其相关影响因素的统计样本数据库进行计算分析,隔离样本的异常噪声干扰,利用教与学算法(TLBO)优化回归参数,建立了回采工作面瓦斯涌出量的优化预测模型,并对煤矿现场数据进行分析预测,结果表明3个回采工作面的瓦斯涌出量预测误差分别为3.04%、0.33%和2.36%,平均相对误差仅为2.36%.TLBO-LOIRE优化预测方法,预测准确性高,能够满足井下瓦斯防治的工程需要,对其它工程领域的数据预测同样适用.

基于改进TLBO算法的电力系统区间经济调度

针对风电本身存在的波动性以及预测的不确定性,构建了含备用响应能力约束的经济调度模型;其次针对风电高成本却有较高环境效益的特性,引入一种新的平衡因子——弃风系数,以此来平衡风电成本,并对该平衡因子的有效区间进行了定义;同时对教与学优化(teaching-learning based optimization,TLBO)算法进行了优化改进,引入新的教学因子和交叉操作,进一步提高其收敛速度和收敛能力,并将其应用于模型求解中。最后利用改进的TLBO算法(improved teaching-learning based optimization,ITLBO)对10机系统进行了仿真计算,验证了弃风系数对平衡风电成本的有效性以及该算法解决此类问题的优越性。

云环境下改进TLBO算法的图像边缘检测

针对TLBO算法在解决复杂高维问题时,表现容易陷入局部最优,多样性丢失过快等不足的问题,提出了一种基于云计算环境下改进的TLBO算法(ITLBO),并将其应用到图像边缘检测中。通过对基本TLBO算法中的‘教’与‘学’阶段进行改进,引入一种新的种群更新方法,提高算法的迭代寻优能力。利用云环境下将该方法应用到图像边缘检测中进行实际性能验证,实验仿真结果表明,该方法提取图像的边缘信息的有效性。本文研究可为智慧城市的建设提供关键技术参考。