An Improved Gorilla Troops Optimizer Based on Lens Opposition-Based Learning and Adaptive β-Hill Climbing for Global Optimization

Gorilla troops optimizer(GTO)is a newly developed meta-heuristic algorithm,which is inspired by the collective lifestyle and social intelligence of gorillas.Similar to othermetaheuristics,the convergence accuracy and stability of GTOwill deterioratewhen the optimization problems to be solved becomemore complex and flexible.To overcome these defects and achieve better performance,this paper proposes an improved gorilla troops optimizer(IGTO).First,Circle chaotic mapping is introduced to initialize the positions of gorillas,which facilitates the population diversity and establishes a good foundation for global search.Then,in order to avoid getting trapped in the local optimum,the lens opposition-based learning mechanism is adopted to expand the search ranges.Besides,a novel local search-based algorithm,namely adaptiveβ-hill climbing,is amalgamated with GTO to increase the final solution precision.Attributed to three improvements,the exploration and exploitation capabilities of the basic GTOare greatly enhanced.The performance of the proposed algorithm is comprehensively evaluated and analyzed on 19 classical benchmark functions.The numerical and statistical results demonstrate that IGTO can provide better solution quality,local optimumavoidance,and robustness compared with the basic GTOand five other wellknown algorithms.Moreover,the applicability of IGTOis further proved through resolving four engineering design problems and training multilayer perceptron.The experimental results suggest that IGTO exhibits remarkable competitive performance and promising prospects in real-world tasks.

LeNS China:A Chinese learning network on sustainability for the development and diffusion of teaching materials and tools on design for sustainability

It is a shared opinion that sustainable development requires a system discontinuity, meaning that radical changes in the way we produce and consume are needed. Within this framework there is an emerging understanding that an important contribution to this change can be directly linked to decisions taken in the design phase of products, services and systems. Design schools have therefore to be able to provide design students with a broad knowledge and effective Design for Sustainability tools, in order to enable a new generation of designers in playing an active role in re-orienting our consumption and production patterns. This paper presents the intermediate results of the LeNS China, the Learning Network on Sustainability of Chinese design Higher Education Institutions aiming at curricula development on Design for Sustainability. The project is a regeneration of the LeNS Asian-European multi-polar network project financed by the European Commission. LeNS China is taking in consideration the local needs, interests and opportunities could represent a significant enabling platform capable to sensitise, support and empower a new generation of Chinese design educators, designers and entrepreneurs to reach design practice throughout an open collaborative learning approach. The paper will firstly introduce the LeNS project and its ethos, and then the LeNS China network will be described in terms of the state of the art of design for sustainability and its education in China, the scope and the objective, the results achieved so far and the next steps.

Through Pacific/Pasifika Lens to Understand Student＇s Experiences to Promote Success Within New Zealand Tertiary Environment

Traditionally, education environments are Eurocentric. They have reinforced ＂pedagogy of the oppressed＂ where Western knowledge is reflected in the university curriculum and ways of learning and teaching. Factors influencing success in learning remain an area of strong interest particularly in regard to non-traditional students in learning and teaching settings. This study explores the strategies undertaken by first, second, and third generation Paciflc/Pasifika students to overcome challenges whilst studying and utilizing services provided by staff in the Pasifika Learning Village at the Auckland University of Technology in New Zealand. The study adopted a mixed method approach that was adapted by integrating a Pasfika method of talanoa to understand their experiences so that their voices and stories on how they made it through a tertiary environment are heard and valued. Through Pacific/Pasifika lens, a cultural analysis of Pacific/Pasifika students＇ knowledge, values, and beliefs highlighted that supplementary cultural spaces, Pacific/Pasifika staff support, and valuing and acknowledging the social space relationships are imperative factors empowering them to succeed in a New Zealand tertiary setting. This paper argues that cultural pedagogies integrated into mainstream revealed successes that warrant recognition as they have demonstrated that traditional models within contemporary settings empower and enhance Pacific/Pasifika students＇ success.

Machine learning adaptation of intraocular lens power calculation for a patient group

Background:To examine the effectiveness of the use of machine learning for adapting an intraocular lens(IOL)power calculation for a patient group.Methods:In this retrospective study,the clinical records of 1,611 eyes of 1,169 Japanese patients who received a single model of monofocal IOL(SN60WF,Alcon)at Miyata Eye Hospital were reviewed and analyzed.Using biometric metrics and postoperative refractions of 1211 eyes of 769 patients,constants of the SRK/T and Haigis formulas were optimized.The SRK/T formula was adapted using a support vector regressor.Prediction errors in the use of adapted formulas as well as the SRK/T,Haigis,Hill-RBF and Barrett Universal II formulas were evaluated with data from 395 eyes of 395 distinct patients.Mean prediction errors,median absolute errors,and percentages of eyes within±0.25 D,±0.50 D,and±1.00 D,and over+0.50 D of errors were compared among formulas.Results:The mean prediction errors in the use of the SRT/K and adapted formulas were smaller than the use of other formulas(P<0.001).In the absolute errors,the Hill-RBF and adapted methods were better than others.The performance of the Barrett Universal II was not better than the others for the patient group.There were the least eyes with hyperopic refractive errors(16.5%)in the use of the adapted formula.Conclusions:Adapting IOL power calculations using machine learning technology with data from a particular patient group was effective and promising.

基于VMD-LILGWO-LSSVM短期风电功率预测

目的为了减小风电功率并入国家电网时产生的频率波动,提高风电功率预测精度,方法提出一种结合变分模态分解(VMD)、改进灰狼算法(LILGWO)和最小二乘支持向量机(LSSVM)的风电功率短期预测方法。首先通过VMD方法将风电功率序列分解重构成3个复杂程度性不同的模态分量,降低风电功率的波动性;其次使用LSSVM挖掘各分量的特征信息,对各分量分别进行预测,针对LSSVM模型中重要参数的选取对预测精度影响较大问题,引入LILGWO对参数进行寻优;最后将各分量预测结果叠加重构,得到最终预测风电功率。结果以宁夏回族自治区某地区风电站实际数据为例,对未来三天分别进行预测取平均值,本文方法的预测平均绝对误差(mean absolute error,MAE)为2.7068 kW,均方根误差(root mean square error,RMSE)为2.0211,拟合程度决定系数(R-Square,R^(2))为0.9769,与对比方法3~6相比,RMSE分别降低了40.93%,25.21%,14.7%,6.24%;MAE分别降低了42.34%,28.04%,16.97%,7.77%;R^(2)分别提升了4.21%,1.78%,0.82%,0.28%。预测时长方面,BP和LSSVM平均训练时间分别是10,138 s,虽然LSSVM预测时间较长但效果最好,采用PSO、GWO、LILGWO对LSSVM进行寻优后训练时间分别平均缩短了39,44,58 s。结论仿真验证了所提方法在短期风电功率预测方面的有效性。

改进的北方苍鹰算法优化粒子滤波算法

针对标准粒子滤波过程的权值退化和样本贫化问题,提出一种改进的北方苍鹰算法优化粒子滤波算法INGOPF(Improved Northern Goshawk Optimization for Particle Filter)。首先,利用透镜成像学习策略增加种群多样性,在优化初始解的同时增加种群搜索范围,使算法尽可能搜索到潜在的最优解,增加算法的搜索能力。其次,将改进的北方苍鹰位置更新公式用于优化迭代更新,然后将最优最差学习策略与透镜成像学习策略结合,克服算法陷入局部最优和易早熟的情况,提高算法的收敛精度。最后,将INGOPF应用于锂电池的寿命预测。仿真结果表明:与标准粒子滤波以及粒子群算法优化的粒子滤波方法相比,INGOPF有效提升了粒子多样性、系统状态估计精度、滤波稳定性和实际运用能力。

改进?鱼优化算法和熵测度的图像多阈值分割

针对传统图像多阈值分割方法存在效率低、分割质量差等问题,提出一种改进?鱼优化算法并结合熵测度(weight lens remora optimization algorithm,WLROA)的图像多阈值分割方法。针对?鱼优化算法易陷入局部极值等缺陷,引入透镜成像反向学习策略,生成透镜反向解来增加种群多样性,进而提高算法跳出局部极值能力;提出一种自适应权重因子,对个体位置进行自适应扰动,提高算法探索能力。以最小化交叉熵作为优化目标,利用WLROA确定最小交叉熵并获得相应分割阈值。选取部分伯克利大学分割数据集图像和遥感图像测试提出算法的分割性能,测试结果表明,WLROA与其他知名算法相比具有更好的分割效果,能够有效实现复杂图像的精确处理。

基于透镜成像对立学习TSO算法的无人机三维航迹规划

金枪鱼优化算法求解无人机三维航迹规划容易出现搜索精度差、航迹代价高的问题,为此设计了基于透镜成像对立学习机制的改进金枪鱼优化算法。首先,引入非线性权重系数更新、最优最差对立学习及透镜成像对立学习策略对金枪鱼优化算法寻优性能进行改进,提升算法逼近最优解的精度;然后,建立具有地貌约束和性能约束的障碍物威胁模型,将无人机三维航迹规划问题转换为代价函数优化问题,利用改进算法迭代求解航迹规划,搜索代价最小且安全避障的最优航迹。实验结果表明,改进算法有效解决了原有早熟收敛问题,其规划航程更短、代价更低,且航迹规划效率得到了有效提升。

混合策略改进的减法平均优化算法

减法平均的优化算法(Subtraction-Average-Based Optimizer,SABO)是一种新的元启发式算法,具有参数少、易实现、结构简单等优点,为了进一步提高SABO算法性能,提出了一种混合策略改进的减法平均的优化算法(HSABO)。首先,在种群初始化时,通过引入Tent混沌映射,使初始化种群成员能够均匀分布;其次,在计算种群新个体位置时,加入了自适应惯性权重,提高了算法的局部搜索能力;最后,引入透镜成像反向学习策略,对新个体位置以一定的概率进行扰动变异,避免陷入局部最优,增强算法全局探索的能力。通过14个标准测试函数,对改进算法与其他优化算法进行测试比较。仿真结果表明,HSABO算法是可行有效的,相比于其他基本算法,其寻优精度和收敛速度都有了很大的提高。

一种基于算术运算和透镜成像学习策略的改进灰狼优化算法

针对基本灰狼优化算法收敛速度慢,易陷入局部搜索的情况,提出一种基于算术运算和透镜成像学习策略的改进灰狼优化算法。该算法在基本灰狼优化算法的基础上,引入算术优化算法的乘除算子,利用带透镜成像的反向学习策略增强最优个体的多样性,增强算法的全局探索能力,提高收敛速度。对比实验结果表明,改进的灰狼优化算法具有收敛速度快、易跳出局部寻优状态,在30个基准测试函数的求解中获得了28个测试函数的最优均值,并且求解质量及普适性均优于最新的几种对比算法。

基于自适应权重与透镜成像学习的麻雀算法

为了解决麻雀搜索算法(SSA)存在的跳出局部最优值能力弱、寻优精度不理想等缺陷,提出了一种基于自适应权重因子与透镜成像反向学习的麻雀搜索算法(LIW-SSA)。利用Circle映射和一般反向学习策略生成麻雀种群,提升了初始种群的质量以及丰富性。将自适应权重因子引入到麻雀种群警戒者更新公式中,能有效平衡算法前后期搜索能力。采用透镜成像学习机制对当前麻雀最优个体实施干扰,提高了算法的跳出局部最优以及寻优性能。通过对基准测试函数的寻优对比,验证了提出的LIW-SSA算法相较于基本麻雀搜索算法以及其他优化算法,在算法稳定性以及寻优精度上得到了很大的提高。

融合多狩猎协调策略的爬行动物搜索算法

爬行动物搜索算法(RSA)具有较强的全局探索能力,但开发能力相对薄弱,在迭代后期无法较好地收敛。针对上述问题,综合教与学优化(TLBO)算法、二次插值的天牛须搜索(BAS)算法和透镜成像反向学习策略,提出一种融合多狩猎协调策略的爬行动物搜索算法(MHCS-RSA)。MHCS-RSA保留了RSA包围阶段(全局探索)和狩猎阶段(局部开发)中狩猎合作的位置更新公式,在狩猎阶段,将狩猎协调融合TLBO算法的学习阶段和二次插值的BAS进行位置更新,以增强算法的开发能力和收敛能力;此外,引入透镜成像反向学习策略以增强算法跳出局部最优的能力。在CEC 2020测试函数上的实验结果表明,MHCS-RSA具有良好的寻优能力、收敛能力以及鲁棒性。最后通过对拉力/压力弹簧设计问题和减速器设计问题的求解,进一步验证了MHCS-RSA求解实际问题的有效性。

基于ICOA算法的三维无人机路径规划

针对浣熊算法(COA)全局寻优能力不足的问题,提出改进的浣熊算法(ICOA)。通过SPM混沌映射初始化种群,引入莱维飞行和透镜成像反向学习综合的位置更新策略,提高了算法跳出局部最优解和全局搜索能力。采用基准函数测试,结果表明,ICOA算法与COA算法、麻雀搜索算法(SSA)和算术搜索算法(AOA)相比拥有更优的收敛速度和收敛精度。针对各种地形、威胁和约束三维无人机的路径规划问题,构建丘陵地貌的仿真环境模拟无人机执行古建筑群勘探任务的场景,并使用ICOA算法、COA算法、SSA算法和AOA算法进行路径规划。仿真结果表明,ICOA算法规划路径的适应度值更优,路径距离更短且俯仰角度更小,进一步验证了ICOA算法的有效性及其应用于丘陵地区无人机勘探任务的可行性。

Machine learning adaptation of intraocular lens power calculation for a patient group

Background:To examine the effectiveness of the use of machine learning for adapting an intraocular lens(IOL)power calculation for a patient group.Methods:In this retrospective study,the clinical records of 1,611 eyes of 1,169 Japanese patients who received a single model of monofocal IOL(SN60WF,Alcon)at Miyata Eye Hospital were reviewed and analyzed.Using biometric metrics and postoperative refractions of 1211 eyes of 769 patients,constants of the SRK/T and Haigis formulas were optimized.The SRK/T formula was adapted using a support vector regressor.Prediction errors in the use of adapted formulas as well as the SRK/T,Haigis,Hill-RBF and Barrett Universal II formulas were evaluated with data from 395 eyes of 395 distinct patients.Mean prediction errors,median absolute errors,and percentages of eyes within±0.25 D,±0.50 D,and±1.00 D,and over+0.50 D of errors were compared among formulas.Results:The mean prediction errors in the use of the SRT/K and adapted formulas were smaller than the use of other formulas(P<0.001).In the absolute errors,the Hill-RBF and adapted methods were better than others.The performance of the Barrett Universal II was not better than the others for the patient group.There were the least eyes with hyperopic refractive errors(16.5%)in the use of the adapted formula.Conclusions:Adapting IOL power calculations using machine learning technology with data from a particular patient group was effective and promising.

瞬态搜索金枪鱼优化城市物流无人机路径规划

针对复杂城市物流无人机路径规划易收敛于局部最优的不足,提出一种自适应瞬态搜索金枪鱼优化算法的无人机路径规划方法。设计Kent混沌初始化丰富初始种群多样性,提出自适应瞬态搜索平衡全局搜索与局部开发,利用透镜成像对立学习和柯西变异混合扰动防止算法陷入局部最优。利用改进金枪鱼优化算法求解城市物流无人机路径规划问题,结合城市飞行环境三维建模,设计评估路径规划的多目标代价函数,并对物流无人机路径规划方案迭代求解。实验结果表明,改进算法能够得到安全避障且代价更小的路径。

动态透镜成像学习人工兔优化算法及应用

针对基本人工兔优化(Artificial Rabbits Optimization, ARO)算法在解决复杂优化问题时存在收敛慢、精度不高和容易陷入局部最优等缺陷,本文提出一种改进的ARO算法(记为IARO算法)。IARO算法中的基于正弦函数的非线性递减能量因子能够帮助算法实现从探索阶段到开发阶段的良好过渡,从而提高算法的收敛速度和解的质量。此外,为了提高算法跳出局部最优的概率,IARO算法引入了一种动态透镜成像学习策略。为了证明IARO算法的优越性,首先选取了6个基准测试函数进行数值实验,然后用其求解2个工程设计优化问题和1个包括15个数据集的特征选择问题,并与灰狼优化(GWO)算法、鲸鱼优化算法(WOA)、正弦余弦算法(SCA)和基本ARO算法进行对比。结果表明,IARO算法有着比其他对比算法更优越的性能。

透镜成像对立学习的SMA算法及舆情预测应用

网络舆情具有小样本特征,而传统方法预测准确率低,容易得到局部最优。为此,提出一种改进黏菌算法优化支持向量机的网络舆情预测模型ISMA-SVM。引入混沌Circle映射机制提高初始种群的多样性;利用对数非线性调节反馈因子均衡算法全局搜索与局部开发;设计透镜成像对立学习机制对最优个体变异,扩展搜索空间并避免算法陷入局部最优。利用改进黏菌优化算法优化支持向量机模型,构建网络舆情预测模型。以若干舆情热点百度指数作为样本进行实证研究,结果表明,改进模型具有更高的数据拟合度,预测准确度更高。

基于改进北方苍鹰优化算法的多阈值图像分割

多阈值图像分割是一种简单、准确、高效且普遍的图像分割方法,相比单阈值图像分割更适用于包含大量信息的彩色图像。在多阈值图像分割中,随着阈值数量的增加,传统的枚举法计算量增大,分割一幅彩色图像不仅需要更多的时间,而且分割精度也随之降低。提出一种基于改进北方苍鹰优化(INGO)算法的多阈值图像分割方法。利用立方混沌优化与透镜成像反向学习策略增加种群多样性,在优化初始解的同时扩大种群搜索范围,使INGO算法尽可能搜索到潜在的最优解,增强算法的搜索能力。将最优最差反向与透镜成像反向学习策略相结合,避免INGO算法易陷入局部最优的情况,提高收敛精度。在对经典的伯克利测试图像进行多阈值彩色图像分割的实验结果表明,在GWO、PSO、ChOA等算法中,INGO算法取得峰值信噪比和特征相似度最优平均值的占比分别为100.000%和78.125%,在保证算法收敛效率的同时获得较优的图像分割结果,在多阈值图像分割领域具有较强的理论应用价值。

融合多策略改进的黏菌优化算法

针对黏菌优化算法(Slime Mould Algorithm,SMA)的寻优过程存在收敛效率较低、容易陷入局部最优解等问题,文中提出融合多策略改进的黏菌优化算法(Improved SMA Fused with Multi-strategy,MISMA).引入Halton序列,丰富初始种群的多样性,提升算法寻优的遍历性和收敛精度.融入差分变异思想,改进算法的全局位置更新公式,强化全局探索能力,增强算法的持续寻优性能.糅合改进收敛因子和精英选择机制的局部搜索策略,提升算法的局部开采能力,更好地平衡算法的全局探索与局部开发进程.基于动态边界的透镜成像学习策略改善个体的质量,加强算法反早熟及摆脱局部最优解的能力.在13个基准函数及部分CEC2014测试函数上的数值仿真实验表明,MISMA具有较强的鲁棒性.此外,在光伏电池组件模型参数优化实验上进一步验证MISMA在处理实际工程优化问题时的优越性及适用性.

基于混合策略改进鲸鱼优化算法的模糊时间序列模型

近年来研究者们提出了许多基于模糊时间序列的预测模型,并发现论域划分机制和去模糊化预测方法是影响模型预测精度的主要因素。对此,提出了一种混合模型,将改进鲸鱼优化算法用于论域划分,提出一种基于次序和时序的平均加权算子优化去模糊化预测方法。在Alabama大学入学人数数据集上进行仿真实验,与国内外相关研究进行横向分析。结果表明,改进鲸鱼优化算法在收敛速度、求解精度都有很大程度提升;混合模型与基线模型对比时,训练阶段和预测阶段都获得了最小的均方根误差(RMSE)和平均绝对百分比误差(MAPE),训练阶段对照基线最优模型,RMSE减少21.1%,MAPE降低0.28%。