求解服务选取问题的混合蚁群优化算法

为解决大规模服务选取问题,提出了一种混合蚁群优化(HACO)算法.该算法先采用动态skyline服务查询过程过滤抽象服务类相关的冗余候选服务,以大力缩减空间提高查找效率,然后利用聚类设计动态构造图来引导蚂蚁的搜索方向,从而确定局部服务选取的搜索区域;基于已经确定的局部服务选取的搜索区域,利用启发式策略选取具体的组合服务.采用标准的真实数据集和综合产生的数据集对所提的方法进行试验评估,以及和最近提出的相关组合服务算法进行对比.实验结果在解的质量和处理时间方面效果显著.     

基于改进蚁群算法对 VRP 线路优化

针对基本蚁群算法存在易陷入局部最优解、 收敛速度慢等缺点, 先引入节约矩阵 U 作为先验信息引导蚂 蚁搜索, 然后通过不同搜索时段采用不同的信息素挥发因子, 使算法更好地在“探索冶和“利用冶之间达到平衡, 并对较优解应用 2-opt 方法进行优化。 最后将改进后的蚁群算法应用到物流配送车辆路径优化问题中。 实验结 果表明, 相比基本蚁群算法, 改进的算法可得到更好的物流配送路径, 是解决物流配送路径优化问题的一种有 效方法, 可快速、 高效地对送货车辆线路进行调整, 满足消费者的需求。     

基于蚁群算法的物流配送算法

蚁群算法是一种新型智能仿生类算法.以近年来国内外学者提出的蚁群算法思想为基础,结合实际应用,对和生活紧密相关的物流配送系统进行了研究,提出了基于蚁群算法的配送算法,从而快速实现了企业物流配送业务,减少了企业的物流成本.     

（S）-4-苄基-2-噻唑硫酮诱导椰树犀牛甲虫聚集信息素的合成

以（S）-4-苄基-2-噻唑硫酮为手性助剂,与丁烯酰氯进行N-酰化反应,所得酰化产物与溴代正丁烷的铜试剂进行不对称迈克尔加成反应,在NaBH4作用下解脱得到（R）-3-甲基庚醇,再经氰化、水解等反应,合成出椰树犀牛甲虫聚集信息素,其化学总产率为39.45％,光学异构体纯度达93％e.e.以上。     

基于信息扩散机制的双子群粒子群优化算法

针对粒子群算法在多峰、高维函数的全局优化中易陷入局部极值的问题,在分析算法早熟收敛原因的基础上,提出一种基于信息扩散和多样性反馈机制的双子群粒子群优化算法。算法将粒子群划分力两纽搜紊方向相反的主、辅子群协同进化,通过引入信总扩散函数,根据不同粒子的位置及相应适应值与当前群体最佳位置和最佳适应值的关系,控制粒子变尺度向群体当万矿最佳位置移动,岁倦于多样性反馈机制动态调节惯性权重和分配主、辅子群的粒子数量。对基准函数的仿真优化结果表明,改进算法与其他PSO改进算法相比,具有抑制早熟、收敛速度快、求解精度高的特点。     

Accumulation of phenylpropanoids in the rectal glands of males of the Oriental fruit fly,Dacus dorsalis

Summary Two phenylpropanoid compounds, 2-allyl-4,5-dimethoxyphenol(II) and coniferyl alcohol(III), were characterized from body tissue of wild males of the Oriental fruit fly,Dacus dorsalis. These compounds accumulated in the rectal glands only when laboratory-reared males were fed with methyl eugenol. Compound II was released into the air during dusk, which coincides with the fly courtship period. Pheromonal and allomonal effects of the phenylpropanoids were examined.     

Enemy-induced dispersal in a parasitic wasp

Females of the parasitic waspAphidius uzbekistanicus, a specialist aphid primary parasitoid, react to the presence of their specialist hyperparasitoid enemyAlloxysta victrix by leaving the area. The wasps leave to increase their reproductive success, because only their offspring, but not the wasps themselves, are threatened by enemy attack. Furthermore, this dispersal is elicited through the action of volatile chemical cues produced by the hyperparasitoids. We provide evidence for 6-methyl-5-hepten-2-one being one of the volatiles eliciting dispersal. The tendency of the wasps to leave areas which are being colonized by their enemies reduces their efficiency as aphid antagonists.     

3-Ethyl-2,5-dimethylpyrazine,a component of the trail pheromone of the antMessor bouvieri

Summary 3-Ethyl-2,5-dimethylpyrazine, found in the poison gland of workers, induces trail following in the Mediterranean harvester antMessor bouvieri. The poison gland contains on average 9 ng of this trail pheromone component. The alkaloids anabasine and anabaseine are also present in this gland, but induce no reaction in workers. Trail following is also induced by substances present in the Dufour gland, but the combined effect of both glands shows no synergism.     

Unique sex chromosome mediated behavioral response specificity of hybrid male European corn borer moths

Unlike the narrow response windows exhibited by the parent races, hybrid male European corn borers resulting from crosses of the E and Z races respond to a wide range of sex pheromone blends. The F₁ response profile consists of some individuals that respond to both the Z pheromone and the 6535 E/Z blend produced by F₁ females. Some F₁ males fail to respond to any blend and some do not respond as broadly as others. The hybrid male populations, however, are not tuned optimally to the pheromone blend produced by F₁ females and there is no coupling of F₁ blend production and response.     

Inter-specific avoidance of egg-associated semiochemicals in four tortricids

Oviposition of four tortricid pests of vineyards (the European grapevine moth and the grape berry moth) and fruit orchards (the codling moth and the oriental fruit moth) is deterred by a blend of straight chain fatty acids and esters of fatty acids that have been identified in the eggs of one of them: the European grapevine moth (EGVM)Lobesia botrana. This is the first evidence of inter-specific recognition of an egg-like signal in moths. We demonstrate that oviposition site selection is influenced by population density, avoidance of deterrent being most important when females are isolated. Inter-specific egg recognition might be an important phenomenon, especially in species competing for a common food resource. We propose the term oviposition regulating synomone for molecules and blends that affect the inter-specific spacing of eggs.