Enhancing Renewable Energy Integration:A Gaussian-Bare-Bones Levy Cheetah Optimization Approach to Optimal Power Flow in Electrical Networks

In the contemporary era,the global expansion of electrical grids is propelled by various renewable energy sources(RESs).Efficient integration of stochastic RESs and optimal power flow(OPF)management are critical for network optimization.This study introduces an innovative solution,the Gaussian Bare-Bones Levy Cheetah Optimizer(GBBLCO),addressing OPF challenges in power generation systems with stochastic RESs.The primary objective is to minimize the total operating costs of RESs,considering four functions:overall operating costs,voltage deviation management,emissions reduction,voltage stability index(VSI)and power loss mitigation.Additionally,a carbon tax is included in the objective function to reduce carbon emissions.Thorough scrutiny,using modified IEEE 30-bus and IEEE 118-bus systems,validates GBBLCO’s superior performance in achieving optimal solutions.Simulation results demonstrate GBBLCO’s efficacy in six optimization scenarios:total cost with valve point effects,total cost with emission and carbon tax,total cost with prohibited operating zones,active power loss optimization,voltage deviation optimization and enhancing voltage stability index(VSI).GBBLCO outperforms conventional techniques in each scenario,showcasing rapid convergence and superior solution quality.Notably,GBBLCO navigates complexities introduced by valve point effects,adapts to environmental constraints,optimizes costs while considering prohibited operating zones,minimizes active power losses,and optimizes voltage deviation by enhancing the voltage stability index(VSI)effectively.This research significantly contributes to advancing OPF,emphasizing GBBLCO’s improved global search capabilities and ability to address challenges related to local minima.GBBLCO emerges as a versatile and robust optimization tool for diverse challenges in power systems,offering a promising solution for the evolving needs of renewable energy-integrated power grids.

基于Cheetah技术的测试规程模板开发与应用

完成测试规程是DO-178B中软件验证过程的重要目标。基于Cheetah技术设计和实现测试规程模板,根据形式化软件高层需求设计的测试用例,自动转化为测试规程,从而避免了手工创建测试规程过程中测试用例的不一致性和繁琐性,同时提高了软件测试效率。宿主机平台测试环境中运行测试规程,测试结果表明可针对软件高层需求进行验证。

Calcinosis circumscripta in a captive African cheetah(Acinonyx jubatus)

This article reports a first case of calcinosis circumscripta in a captive African cheetah(Acinonyx jubatus).Histopathology demonstrated well defined multiple cystic structures containing granular,dark basophilic materials with peripheral granulomatous reaction,characterized by presence of multinucleated giant cells surrounded by a varying amounts of fibrous connective tissues.Special staining with von Kossa revealed black stained deposits confirming the presence of calcium salts.

Spatial and Temporal Habitat Use by GPS Collared Male Cheetahs in Modified Bushland Habitat

Cheetahs and other apex predators are threatened by human-wildlife conflict and habitat degradation. Bush encroachment creates one of the biggest forms of habitat change, thus it is important to understand the impact this has on habitat use. We investigated habitat preferences of five male cheetahs in Namibian farmlands degraded by bush encroachment. Cheetahs were tracked using satellite based Global System for Mobile (GSM) collars providing a higher resolution on ranging behavior. We aimed to investigate: 1) habitat characteristics;2) evidence for habitat selection;3) temporal activity partitioning;and 4) whether revisits to locations were related to habitat type. There were differences in habitat characteristics, showing that cheetahs were able to utilise different habitats. Fecal pellet counts revealed that warthog, oryx, scrub hare and kudu were most abundant. The cheetahs spent more time in high visibility shrubland, suggesting they selected rewarding patches within predominantly bush-encroached landscapes. The usage in marginal habitat was strikingly influenced by habitat type, with both previously cleared and open vegetated areas showing high proportions in edge use. Individuals exhibited significant temporal activity partitioning, showing peaks between late afternoon and early morning hours. This finding could be key to managing human-wildlife conflict by showing that increased protection such as the use of herders and livestock guarding dogs should be used as mitigation methods to minimize the impact of cheetah specific temporal patterns at all times as defined in this research. Visits to the same locations were not correlated to habitat type;revisits may be dictated by other reasons such as social interaction, prey density or avoidance of other predators. Findings from this study will help build existing knowledge on the effects bush encroachment has on cheetah habitat preference.

赛康Cheetah数码印刷机获EDP 2015最佳标签印刷解决方案奖

在2015年度EDP大奖赛上,赛康Cheetah数码印刷机荣获了最佳标签印刷解决方案奖,这也是该设备获得的首个行业大奖。Cheetah数码印刷机是赛康在Labelexpo Americas 2014上推出的。一些早期的使用者已开始将Cheetah数码印刷机加入到了企业的生产体系当中,例如,世界首台Cheetah数码印刷机用户莫西亚人标签公司。

The Structural Design, Simulation Analysis and Parameter Optimization of the Cheetah Robot's Lumbar Vertebrae

The quality of skeleton system for the cheetah robot goes hand in hand with its bionic result of its shape, structure and functions. In view of the skeleton system constitution and structural characteristic of the cheetah, the team applied structure design, stimulation analysis and parameter optimization to developing the cheetah robot. In addition, after the invention of cheetah robot＇s anterior lumbar vertebra based on its functional attribute and connectivity attribute, the Solidworks Simulation was utilized to analyze the design, according to which improvement on the lumbar vertebra was made. Plus, the advantages of the CAD and CAE made the high efficiency of design work and high quality of the cheetah robot possible.

The Role of Copper and Vitamin A Deficiencies Leading to Neurological Signs in Captive Cheetahs(Acinonyx jubatus)and Lions(Panthera leo)in the United Arab Emirates

Neurological signs like ataxia and hind limb paresis have often been reported in cheetahs (Acinonyx jubatus), lions (Panthera leo) and snow leopards (Panthera unica). As a cause, copper and Vitamin A deficiencies have been discussed. Many cases were seen in cheetahs and lions in the United Arab Emirates (UAE) within the last years. The aim of this study was to find correlations between nutrition, serum, and tissue levels, focusing on copper and Vitamin A. Blood and tissue samples of affected and unaffected animals were analyzed at the Central Veterinary Research Laboratory in Dubai, UAE. Animals were split into three different groups (A, B and C) according to their diets. Minerals were determined in serum, tissue, food and water samples, and serum was additionally analyzed for Vitamin A and E. Liver, kidney and spinal cord samples were taken for histopathological investigations. Mean serum copper and liver copper levels of animals fed pure chicken muscle meat without supplements were significantly lower (0.41 ± 0.71 μM/L;2.16 ± 0.95 ppm wet weight) than in animals fed a whole carcass prey diet (12.16 ± 3.42 μM/L;16.01 ± 17.51 ppm wet weight) (p < 0.05). Serum Vitamin A and E levels were highest in animals fed whole carcass prey diets (1.85 ± 0.68;27.31 ± 5.69 μM/L). Liver zinc concentrations were highest in animals fed pure chicken meat only (43.75 ± 16.48 ppm wet weight). In histopathology, demyelination of the spinal cord was found in all of the affected animals and most commonly when fed a diet based on poultry without supplements.

硬盘速度更上一层楼希捷发布Cheetah 15K．4

硬盘制造商5eagate(希捷)公司日前正式在日本市场上发售它的旗舰硬盘产品Cheetah 15K.4系列硬盘．这次发售的主要有36Gb和73Gb两种容量：这款15K.4产品相比前一代15K.3产品．在数据传辅速度上从原来的56—86MB／S提高到85—142MB／5，平均寻道时间为3.5Msec。

转速最快的磁盘驱动器:Seagate Cheetah系列产品

Seagate公司一直在不断确立高性能磁盘驱动器的新标准。它的Elite系列率先把5400rpm的转速带入市场,接着又以3.5英寸的Barracuda系列最先倡导了7200rpm的主轴转速,现在3.

猎豹优化算法在水资源优化配置中的应用

水资源优化配置能够解决区域水资源短缺及不合理利用问题,近年来优化算法成为获得水资源优化配置结果的重要工具。为有效缓解现有优化配置算法中存在的收敛缓慢、局部优化和早熟等问题,介绍了一种新型的元启发式算法:猎豹优化算法(the Cheetah Optimizer,CO),利用该算法收敛速度快、鲁棒性强、寻优能力强等优点,将其运用至水资源优化配置问题中。以太原市为研究区域,建立了以经济效益、社会效益和生态效益为目标的水资源优化配置模型,采用CO求解该模型,并与遗传算法(Genetic Algorithm,GA)结果进行对比分析。结果表明:CO的污染物排放总量在规划年(2030)控制目标内,区域用水满意度达到0.98,能够满足基本用水和发展用水需求;与现状年(2020)相比,生活用水占比下降22.58%,三次产业用水占比分别上升10.53%、25.81%、12.5%,地表水和地下水供水比例分别降低21.70%、11.14%,回用水和引黄水供水比例分别提高了5.43%、27.40%,符合太原市水资源配置思路,验证了CO的有效性;与GA相比,CO的区域满意度、综合用水价值和配水公平性分别提高了7.10%、3.57%和56.52%,污染物排放量和缺水率分别降低了3.11%和3.85%,同时有更好的协调性,验证了CO的优越性。研究成果表明用CO求解水资源优化配置模型合理可行,为水资源优化配置模型求解提供了新方法。

猎豹算法优化的车用PMSM控制策略研究

为了解决电机响应速度慢、抗干扰能力不足的问题,研究了PI控制器控制技术。根据矢量控制原理搭建了永磁同步电机矢量控制模型。为提升控制系统面对转速变化的动态性能,根据模糊控制原理设计了模糊PI转速控制器,增加了系统的响应速度。针对模糊控制设计过程中存在主观性及不同工况下控制器参数选择较难等问题,提出了一种基于猎豹算法与模糊PI相结合的智能控制策略,解决系统参数匹配问题。在Matlab/Simulink搭建相关模型并进行仿真。仿真结果表明:通过猎豹算法能够迅速得到模糊PI控制器的最佳参数,使电机的转速响应更快,抗干扰性更强,使控制系统具有更好的动态性能。

Control of a Cheetah Robot in Passive Bounding Gait

Passive dynamics is always one of research emphases of the legged robots. Studies have proved that cheetah robot could achieve stably passive bounding motion under proper initial conditions in the ideal case. However, the actual robot must have energy dissipation because of friction and collision compared with the theoretical model. This paper aims to propose a control method that can drive the cheetah robot running in passive bounding gait. First, a sagittal-plane model with a rigid torso and two compliant legs is introduced to capture the dynamics of robot bounding. Numerical return map studies of the bounding model reveal that there exists a large variety of passively cyclic bounding motions （fixed points）. Based on the distribution law of fixed points, an open-loop control method including touchdown angle control strategy and leg length control strategy is put forward. At last, prototype of the cheetah robot is designed and manufactured, and locomotion experiment are carried out. The experiment results show that the cheetah robot can achieve a stable bounding motion at different speeds with the proposed control method.

基于参数自适应VMD的滚动轴承故障特征提取

针对提取的滚动轴承故障特征信号易受复杂工作环境的影响以及变分模态分解(variational mode decomposition,VMD)参数依赖人为经验选择的问题,课题组提出了一种基于参数自适应的VMD的滚动轴承故障特征提取方法。首先,以原始信号经过VMD后的固有模态函数(intrinsic mode function,IMF)的包络谱熵作为适应度函数,采用猎豹优化(cheetah optimizer,CO)算法对分解阶数k、惩罚因子α进行自适应寻优;其次,基于峭度准则对各IMF分量进行重构;然后,对重构信号进行Hilbert包络谱分析从而提取故障特征,并通过滚动轴承故障仿真信号和实验信号经VMD和SSA-VMD处理结果对比验证可行性。研究结果表明:该方法相比于经典VMD所得故障特征更为准确;在参数寻优时间方面CO算法相比麻雀搜索算法(sparrow search algorithm,SSA)提升了65%。课题组的研究具有一定工程应用价值。

若干新型群体智能算法优化高斯过程回归的年降水量预测

为提高年降水量预测精度,提出一种基于小波包变换(WPT)和孔雀优化算法(POA)、沙猫优化(SCSO)算法、猎豹优化(CO)算法优化的高斯过程回归(GPR)预测模型,并将其应用于文山州年降水量预测研究。首先,利用WPT将实例1956-2021年降水量时间序列分解为1个周期项分量和3个波动项分量;其次,简要介绍POA、SCSO、CO算法原理,利用POA、SCSO、CO分别优化GPR超参数,建立WPT-POA-GPR、WPT-SCSOGPR、WPT-CO-GPR模型;最后,利用所建立的3种模型对年降水量周期项分量和波动项分量进行预测,将4个分量的预测结果加和重构后得到最终预测结果,并构建基于支持向量机(SVM)的WPT-POA-SVM、WPT-SCSOSVM、WPT-CO-SVM模型、基于RBF神经网络的WPT-POA-RBF、WPT-SCSO-RBF、WPT-CO-RBF模型和未经优化的WPT-GPR模型作对比分析模型。结果表明:①WPT-POA-GPR、WPT-SCSO-GPR、WPT-CO-GPR模型对年降水量预测的平均绝对百分比误差MAPE分别为0.52%、0.46%、0.48%,平均绝对误差MAE分别为5.80 mm、5.31 mm、5.25 mm,均方根误差RMSE分别为8.20 mm、7.72 mm、7.83 mm,确定性系数DC>0.99,预测效果优于其他7种模型,具有更高的预测精度和更好的泛化能力。②POA、SCSO、CO能有效优化GPR超参数,显著提高GPR预测性能。③所构建的3种模型具有普适性,为降水等时间序列预测研究提供参考。

基于数据处理与若干群体算法优化的GRU/LSTM水质时间序列预测

为提高水质时间序列预测精度,提出一种基于小波包变换(WPT)和变色龙优化算法(CSA)、猎豹优化(CO)算法和山瞪羚优化(MGO)算法的优化门限循环控制单元(GRU)、长短期记忆神经网络(LSTM)的预测模型。首先利用WPT对pH值、DO、COD_(Mn)、NH_(3)-N时间序列进行平稳化处理,得到若干个规律性较强的子序列分量;其次简要介绍了CSA、CO、MGO算法原理,利用CSA、CO、MGO分别寻优GRU、LSTM超参数,建立WPT-CSA-GRU、WPT-CO-GRU、WPT-MGO-GRU、WPT-CSA-LSTM、WPT-CO-LSTM、WPT-MGO-LSTM模型;最后利用所建立的模型对pH值及DO、COD_(Mn)、NH_(3)-N浓度各分量进行预测和重构,并建立WPT-GRU、WPT-LSTM和WPT-CSA-SVM、WPT-CO-SVM、WPT-MGO-SVM模型作对比分析模型,以云南省昆明市观音山断面为例,通过pH值及DO、COD_(Mn)、NH_(3)-N浓度预测对模型进行了验证。结果表明:WPT-CSA-GRU、WPT-CO-GRU、WPT-MGO-GRU、WPT-CSA-LSTM、WPT-CO-LSTM、WPT-MGO-LSTM模型对实例pH值及DO、COD_(Mn)、NH_(3)-N浓度的预测精度优于其他对比模型,具有较好的预测效果,其中尤以WPT-CSA-GRU、WPT-CO-GRU、WPT-MGO-GRU模型的预测精度最高;CSA、CO、MGO能有效调优GRU、LSTM超参数,显著提高GRU、LSTM预测性能;所构建的6种模型预测精度高且计算规模小,是有效的水质时间序列预测模型,可为相关水质预测研究提供参考。

章怀太子墓壁画《狩猎出行图》助猎动物考察

助猎动物有猎犬、鹰隼、猎豹、狞猫等,在我国传世古代绘画中,章怀太子墓壁画《狩猎出行图》是唯一四者兼具的一幅。学界有关《狩猎出行图》的研究甚多,但针对其助猎动物的研究似乎尚未见过。《狩猎出行图》中寻觅出七只犬,其中三只为宠物犬、四只为猎犬。其中一只为细犬,一只为本土田犬,另两只的品种只能臆测。同时找到四只鹰隼,除了最左侧的凤头鹰雕,其余三只的种别也只能臆测。在讨论中,作者认为,图中的猎豹和狞猫,或许仪仗意义大于实际意义。两匹辎重骆驼,一匹驮负炊具,一匹驮负薪柴,由于未驮负营帐,此行应为当日往返。猎取点野味,顺便带着宠物犬出游,或许才是此行的主要目的。附记说明1996年初次研究《狩猎出行图》时,将狞猫误为猞猁的前因后果。

猎豹与虎猫杯状病毒的分离及其超变区基因比较研究

用F8 1细胞从上海某动物园患口腔溃疡的猎豹和虎的唾液病料中分离获得两株杯状病毒 ,经形态学、理化学、生物学鉴定和病毒核酸超变区基因RT_PCR扩增与序列测定证明两株病毒均为猫杯状病毒 (FCV) ,分别命名为FCV/cheetah/Shanghai/ 0 2 / 2 0 0 2与FCV/tiger/Shanghai/ 0 3/ 2 0 0 2。人工感染猫可引起体温升高 ,口腔溃疡 ,食欲下降等症状。两株病毒的超变区序列 5 2 0bp长片段间的同源性为 99.2 % ,与国内桂林虎分离株 (TFCV9710 )的同源性为 74 .0 % ,与国外分离株的总体同源性为 5 8.1% ,说明不同宿主或同种不同个体间杯状病毒分离株超变区核酸差异十分显著 。