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1.
群体智能优化算法   总被引:13,自引:0,他引:13  
讨论四种群体智能优化算法--蚁群算法、微粒群算法、人工鱼群算法和混合蛙跳算法,对其算法的原理、发展及应用进行了综述.提出了群体智能优化算法统一框架模式,并对群体智能优化算法进一步发展进行了讨论.  相似文献   
2.
In this paper, a mixed-model assembly line (MMAL) sequencing problem is studied. This type of production system is used to manufacture multiple products along a single assembly line while maintaining the least possible inventories. With the growth in customers’ demand diversification, mixed-model assembly lines have gained increasing importance in the field of management. Among the available criteria used to judge a sequence in MMAL, the following three are taken into account: the minimization of total utility work, total production rate variation, and total setup cost. Due to the complexity of the problem, it is very difficult to obtain optimum solution for this kind of problems by means of traditional approaches. Therefore, a hybrid multi-objective algorithm based on shuffled frog-leaping algorithm (SFLA) and bacteria optimization (BO) are deployed. The performance of the proposed hybrid algorithm is then compared with three well-known genetic algorithms, i.e. PS-NC GA, NSGA-II, and SPEA-II. The computational results show that the proposed hybrid algorithm outperforms the existing genetic algorithms, significantly in large-sized problems.  相似文献   
3.
一种基于阈值选择策略的改进混合蛙跳算法   总被引:20,自引:3,他引:17       下载免费PDF全文
混合蛙跳算法(SFLA)是一种全新的后启发式群体进化算法,具有高效的计算性能和优良的全局搜索能力。对混合蛙跳算法的基本原理进行了阐述,针对算法局部更新策略引起的更新操作前后个体空间位置变化较大,降低收敛速度这一问题,提出一种基于阈值选择策略的改进混合蛙跳算法。通过不满足阈值条件的个体分量不予更新的策略,减小了个体空间差异,从而改善了算法性能。数值实验证明了该改进算法的有效性,并对改进算法的阈值参数进行了率定。  相似文献   
4.
研究水资源系统脆弱性有助于水资源可持续利用的实现,结合驱动力—压力—状态—影响—响应(DPSIR)框架构建了水资源系统脆弱性评价指标体系,利用混合蛙跳算法和投影寻踪方法建立了基于混合蛙跳和投影寻踪的水资源系统脆弱性评价模型,以山东省滕州市为研究区,分别从驱动力—压力—状态—影响—响应5个方面及系统整体进行了水资源系统脆弱性评价,并以模型计算的投影值作为衡量系统脆弱程度的依据。结果表明,该区2008年水资源系统指标体系各方面与整体均处于脆弱性中等范围,其中水资源供需矛盾不断加剧及水资源开发利用条件薄弱导致影响、状态两方面脆弱性程度较高,依靠科技进步措施使得响应类指标对脆弱性影响程度较低,与实际情况相符,可见该模型评价结果可行、有效。  相似文献   
5.
现有的网络社区划分方法以社区为主体,机械地将每一个节点划分到某一个社区,在真实网络中,对于活跃度低的用户进行划分会大大降低划分精确度,同时增加时间复杂度,并具有较小的划分意义。因此,将蛙跳算法与社区划分相结合,通过对青蛙性能的排序,提取活跃度高的用户,从而提高划分精确度。实验结果表明该方法具有良好的性能。  相似文献   
6.
The efficient operation and in-core fuel management of PWRs are of utmost importance. In the present work, a core reload optimization using Shuffled Frog Leaping (SFL) algorithm is addressed and mapped on nuclear fuel loading pattern optimization. SFL is one of the latest meta-heuristic optimization algorithms which is used for solving the discrete optimization problems and inspired from social behavior of frogs. The algorithm initiates the search from an initial population and carries forward to draw out an optimum result. This algorithm employs the use of memetic evolution by exchanging ideas between the members of the population in each local search. The local search of SFL is similar to particle swarm optimization (PSO) and applying shuffling process accomplishes the information exchange between several local searches to obtain an overall optimum result. To evaluate the proposed technique, Shekel’s Foxholes and a VVER-1000 reactor are used as test cases to illustrate performance of SFL. Among numerous neutronic and thermal-hydraulic objectives necessary for a fuel management problem to reach an overall optimum, this paper deals with two neutronic objectives, i.e., maximizing effective multiplication factor and flattening power distribution in the core, to evaluate the capability of applying SFL algorithm for a fuel management problem. The results, convergence rate and reliability of the method are quite promising and show the potential and efficiency of the technique for other optimization applications in the nuclear engineering field.  相似文献   
7.
李建军  郁滨  陈武平 《通信学报》2013,(Z1):216-222
为了提高密码服务的质量,提出了一种面向服务组合的密码服务体系结构,并针对其中的密码服务调度问题提出了一种改进的混合离散蛙跳算法。该算法利用传统混合蛙跳算法的基本框架,重新设计了编码和解码方式以及个体矢量更新方法。同时为了提高搜索的精度,利用6种邻域结构,结合变邻域搜索算法,对组内最优青蛙进行优化。最后分别进行了标准算例对比实验与模拟仿真实验,结果验证了算法高效的寻优能力以及合理地实现了服务组合的优化, 满足了用户的需求, 符合现实情况。  相似文献   
8.
In this paper, we propose an effective heuristic based on the framework of the shuffled frog-leaping algorithm (SFLA) for solving the resource-constrained project scheduling problem (RCPSP). We encode the virtual frog as the extended activity list (EAL) and decode it by the SFLA-specific serial schedule generation scheme (SSSGS). The initial population is generated by the regret-based sampling method and the priority rule. Then, virtual frogs are partitioned into several memeplexes, and each memeplex evolves by adopting the effective resource-based crossover (RBCO). To enhance the exploitation ability, a combined local search including permutation-based local search (PBLS) and forward-backward improvement (FBI) is performed in each memeplex. To maintain the diversity of each memeplex, virtual frogs are periodically shuffled and reorganized into new memeplexes. Basing on some theoretical analysis, speed-up evaluation methods are proposed to improve the efficiency of the SFLA, which are also suitable for other heuristics designed for RCPSP. In addition, we make use of a design-of-experiment method to determine the set of suitable parameters for the SFLA. Computational results and comparisons with some typical existing algorithms demonstrate the effectiveness of the proposed SFLA.  相似文献   
9.
随着片上网络集成度的提高,低功耗映射逐渐成为研究的热点.文中利用调整序思想,将混合蛙跳算法应用到片上网络低功耗映射问题中;同时对混合蛙跳算法进行改进,引入自适应混沌方法优化较差个体,采用多邻域退火策略优化较优个体.实验结果表明,相比于传统混合蛙跳算法和模拟退火混合蛙跳算法,改进混合蛙跳算法具有更优的搜索能力,从而能进一步降低通信功耗.  相似文献   
10.
针对网格环境中DAG任务调度问题,提出一种改进混洗蛙跳算法,通过增设族群进化点和引入邻域搜索策略,解决了原算法进化动力不足和易陷入局部最优的问题;为解决DAG任务在启发式算法中编码困难的问题,利用DAG任务自身的约束条件,重新定义解空间的度量方式,进而提出一种新的编码方式。仿真实验结果表明,改进算法的收敛速度较GA、PSO、SFL算法分别提高了75%、94%和27%,搜索性能亦有明显改善,能有效地提高最优解的质量。  相似文献   
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