共查询到20条相似文献,搜索用时 218 毫秒
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针对人工蜂群算法收敛速度慢和易陷入局部最优的缺点,在雇佣蜂搜索阶段提出了一种基于多维搜索和一维搜索的混合搜索策略,能克服单一一维搜索下收敛速度慢的缺点,有效加快收敛速度;提出了新的跟随蜂蜜源选择策略,可保证种群多样性,增强算法全局搜索能力。通过对12个基准测试函数进行仿真实验并与原算法进行比较,其结果表明改进的算法在收敛速度和精度上均优于人工蜂群算法。 相似文献
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《电光与控制》2017,(1)
针对无人机飞行任务规划系统中的航迹规划问题,提出了一种改进的人工蜂群算法,将其应用于无人机的航迹规划。该算法将航迹规划问题转换成函数优化问题,以蜂群为搜索单位,通过群体之间的信息交流与优胜劣汰机制,使蜂群向更优方向进化。在雇佣蜂搜索阶段采用自适应搜索策略来加快算法收敛速度;在跟随蜂搜索阶段引入一种新的概率选择方式来保证种群的多样性;在侦察蜂搜索阶段利用混沌搜索算子提高算法的全局搜索能力。通过标准函数测试与航迹规划仿真对改进后的算法进行验证,结果表明,改进后的算法提高了全局收敛能力,在收敛速度和精度上优于传统的人工蜂群算法,可有效解决无人机的航迹规划问题。 相似文献
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拓守恒 《微电子学与计算机》2012,29(7):42-46
针对传统优化算法在求解高维非线性优化问题时,存在收敛速率慢和求解精度不高等问题.提出一种改进的人工蜂群优化算法.正交试验设计算法被用于初始化蜂群和侦察蜂探索新蜜源.采蜜蜂利用高斯分布估计优化算法在蜜源附近搜索,跟随蜂采用自适应差分算法进行搜索.最后,通过4个标准的高维Benchmark函数测试表明,本文算法在收敛速度、求解精度和稳定性方面有一定优势. 相似文献
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人工蜂群算法是最近提出的一种较有竞争力的优化技术.然而,它的搜索方程存在着探索能力强而开发能力弱的缺点.针对这一问题,受差分进化算法的启发,提出了一个改进的搜索方程.该搜索方程在最优解附近产生新的候选位置以便提高算法的开发能力.进一步,充分利用和平衡不同搜索方程的探索和开发能力,提出了一个改进的人工蜂群算法(简记为IABC).此外,为了提高算法的全局收敛速度,用反学习的初始化方法产生初始解.通过18个标准测试函数的仿真实验并与其他算法相比较,结果表明IABC算法具有良好的处理复杂数值优化问题的性能. 相似文献
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针对人工蜂群优化的K均值算法易陷入局部最优、搜索精度不够、分割图像不够细致等问题,本文融合自适应人工蜂群和K均值聚类,提出了一种新的图像分割算法。算法首先利用距离最大最小乘积对种群进行初始化;其次采用自适应搜索参数动态调整邻域搜索范围,使人工蜂群算法快速收敛于全局最优;然后将人工蜂群输出的所有蜜源进行K均值聚类,克服K均值聚类结果对初始聚类中心的依赖,再将聚类划分结果进行Powell局部搜索,加快算法收敛的速度,将得到的新聚类中心更新蜂群中蜜源位置。最后,将本文算法与其他两种同类分割算法进行试验对比。实验结果表明:与其他两种算法相比,本文提出的分割算法在保证运行时间的前提下,分割准确率比其他两种算法分别至少提高了3.5%和4.8%,表现出了较高的分割质量。 相似文献
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针对当前离散人工蜂群算法冗余度高、探索性能差、容易陷入早熟等问题,提出一种基于逻辑运算的离散人工蜂群算法.通过引入一系列的逻辑运算,一方面解决了当前离散人工蜂群算法中存在的解不更新问题,提高了算法的搜索效率;另一方面,很好地保证了搜索过程的中间解和最终解都封闭在原离散封闭集内,有效地避开了实数集与离散集间的映射问题.基于逻辑运算的离散人工蜂群算法计算简单、易于硬件实现,在基于图论着色理论的频谱分配模型上进行验证,取得了明显优于离散人工蜂群算法的收敛速度和优化性能. 相似文献
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文章针对传统人工蜂群算法收敛速度慢、精度不高的问题,基于差分进化算法中的变异算子,对人工蜂群算法搜索方程进行改进,在种群更新过程中引入当前种群最优个体信息,以提升算法的收敛速度和局部优化能力。 相似文献
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Meihua Shen Wilfred Pau Nicolas Gani Jianping Wen Shashank Deshmukh Thorsten Lill Jian Zhang Hanming Wu Guqing Xing 《半导体技术》2004,29(8)
This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration. 相似文献
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White organic light-emitting devices based on fac tris(2- phenylpyridine) iridium sensitized 5,6,11,12-tetraphenylnap -hthacene 总被引:1,自引:0,他引:1
We have fabricated the white organic light-emitting devices (WOLEDs) based on 4,4' -bis(2,2 -diphenyl vinyl)-1,1' - biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene (rubrene). The device structure is ITO/2T-NATA (20 nm)/NPBX (20 nm)/CBP: x%Ir(ppy)3:0.5% rubrene (8 nm)/NPBX (5 nm)/DPVBi (30 nm)/Alq(30 nm)/LiF(0.5 nm)/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)3], acts as a yellow light-emitting layer, and N,N' -bis- (1-naphthyl)- N,N' -diphenyl -1, 1' -biphenyl-4,4' -diamine (NPBX) acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir (PPY)3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V. 相似文献
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Complete approach to automatic identification and subpixel center location for ellipse feature 总被引:1,自引:0,他引:1
XUE Ting WU Bin SUN Mei YE Sheng-hua 《光电子快报》2008,4(1):51-54
To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction. 相似文献
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In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal (200) (2d = 0.4027 nm) is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line(w), the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line(x), the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines(y), the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line(z) in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line(q) in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution(λ/△ 2) is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy. 相似文献
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High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET > PDMAT > TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center. 相似文献
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This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors. 相似文献
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Credence Systems Corporation 《半导体技术》2004,29(9)
Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V. 相似文献
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YUXiao-hua XIANGYu-qun 《半导体技术》2005,30(2):30-32,37
An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB. 相似文献
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It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer (LDV). 相似文献