A Modelling of Context-Aware Elderly Healthcare Eco-System-(CA-EHS) Using Signal Analysis and Machine Learning Approach

In cloud computing, more often times cloud assets are underutilized because of poor allocation of task in virtual machine (VM). There exist inconsistent factors affecting the scheduling tasks to VMs. In this paper, an effective scheduling with multi-objective VM selection in cloud data centers is proposed. The proposed multi-objective VM selection and optimized scheduling is described as follows. Initially the input tasks are gathered in a task queue and tasks computational time and trust parameters are measured in the task manager. Then the tasks are prioritized based on the computed measures. Finally, the tasks are scheduled to the VMs in host manager. Here, multi-objectives are considered for VM selection. The objectives such as power usage, load volume, and resource wastage are evaluated for the VMs and the entropy is calculated for the measured objectives and based on the entropy value krill herd optimization algorithm prioritized tasks are scheduled to the VMs. The experimental results prove that the proposed entropy based krill herd optimization scheduling outperforms the existing general krill herd optimization, cuckoo search optimization, cloud list scheduling, minimum completion cloud, cloud task partitioning scheduling and round robin techniques.

     

多目标猫群优化算法支持下的云计算任务调度

针对云环境下任务调度易出现多目标冲突的问题,提出一种改进的基于猫群的多目标优化算法。该算法模拟猫的行为模式,采用基于线性混合比率的猫行为选择方式来提高全局搜索和局部寻优能力;并在迭代过程中结合任务完成时间和任务费用支出,引入一个可调节的多目标集成效用函数,实现了资源与任务的智能调度。实验结果表明,所提算法不仅求解质量高,且在求解速度和调度消耗方面均优于多目标遗传算法和多目标粒子群算法。     

基于极坐标变换的改进NSGA-II算法

在实际工程中存在着大量的多目标优化问题,而由于大部分多目标优化问题有无穷多个最优解,且传统的数学方法如梯度下降法和牛顿法,无法求解一些不可微或表达式过于复杂的多目标优化问题。为避免以上局限,NSGA-II作为求解多目标优化问题的代表算法被提出,但NSGA-II算法仍存在着一些不足,如变异算子功能过于简单,降低了Pareto最优解的多样性。为增加Pareto最优解的多样性,文中设计了一种基于极坐标变换的改进NSGA-II算法,该算法可使得Pareto最优解分布更加均匀,并最终通过标准的测试函数验证了算法的有效性。     

一种基于边缘分布估计的多目标优化算法

该文提出了一种基于边缘分布估计的多目标优化算法,通过在每一进化代中估计较优个体的边缘概率分布来引导算法对Pareto最优解的搜索。通过与基于拥挤机制的多样性保持技术、基于非支配排序的联赛选择、精英保留等技术的有机结合,使得算法在具有良好收敛性能的同时,具有很好的维持群体多样性的能力。通过一组典型测试函数实验对该算法的性能进行了分析,并与NSGA-II、SPEA、PAES等知名多目标优化算法进行了比较,结果表明该文算法收敛速度较快,且得到的非支配解集分布均匀,适合于复杂多目标优化问题的求解。     

基于免疫算法多目标约束P2P任务调度策略研究

任务调度是P2P计算中的一项关键技术,直接影响到整个系统的计算性能.提出了基于免疫算法的多目标约束P2P任务调度策略.首先对多目标P2P任务调度相关问题做出定义,然后分别构造了考虑负载均衡的种群初始化算子和基于熵的克隆选择算子,并设计了新颖的交叉算子、变异算子和具有先验知识的疫苗.在描述了P2P节点获取和管理策略的基础...     

多目标量子编码遗传算法

如何使算法快速收敛到真正的Pareto前沿,并保持解集在前沿分布的均匀性是多目标优化算法重点研究解决的问题。该文提出一种基于量子遗传算法的多目标优化算法,利用量子遗传算法的高效全局搜索能力,在整个解空间内快速搜索多目标函数的Pareto最优解,利用量子遗传算法维持解集多样性的特点,使搜索到的Pareto最优解在前沿均匀分布。通过求解带约束的多目标函数优化问题,对该文算法的多目标优化性能进行了考察,并与NSGAII,PAES,MOPSO和Ray-Tai-Seows算法等知名多目标优化算法进行比较,结果证明了该文算法的有效性和先进性。     

基于合作模型的协同免疫多目标优化算法

本文针对多目标优化问题Pareto最优解集合(PS)的分布特点,构造了一种基于新的子任务划分方法的合作型协同进化模型,并将该模型引入人工免疫系统中,提出了一种基于合作模型的协同免疫多目标优化算法(A Cooperative Immune Coevolutionary Algorithm for Multiobjective Optimization,CICAMO).CICAMO算法运用Tchebycheff分解方法进行子种群划分,然后对各个子种群建立线性概率统计模型分段逼近整个PS,在抗体繁殖上结合了克隆选择和模型采样两种方式.实验结果表明,CICAMO算法在求解质量和收敛速度上均表现良好,尤其对于决策变量非线性相关的多目标优化问题,性能尤为突出.     

基于自适应截断策略的约束多目标优化算法

为提高约束多目标优化问题所求解集的分布性和收敛性,该文提出基于自适应截断策略的约束多目标优化算法。首先,自适应截断选择策略能够保留Pareto最优解和约束违反度及目标函数值均较优的不可行解,不仅提高了种群多样性,而且能够较好地兼顾多样性和收敛性;其次,为增强算法的局部开发能力,在变异操作和交叉操作之后进行指数变异;最后,改进的拥挤密度估计方式只选择一部分Pareto最优解和距离较近的个体参与计算,不仅更加准确地反映解集的分布性,而且降低了计算量。通过在标准测试问题(CTP系列)上与其他4种优秀算法的对比结果可以得出,该算法所求解集的分布性和收敛性均得到一定提高,而且相较于对比算法在求解性能上具备一定的优势。     

多目标优化问题的遗传算法改进研究

基于Nash均衡的思想在NSGA所求得的Pareto最优解基础上,探讨一种能对多目标优化问题进行求解的遗传算法。采用Nash均衡的思想在多目标优化的遗传算法,结合NSGA算法,提出一种能得到多个Pareto最优解的多目标优化算法。通过目标函数线性加权法、NSGA对函数进行了试验分析,对部分自变量进行固定,对其他的自变量进行优化,对Pareto最优解进行持续优化,进而实现加速算法的收敛,从实验中得出了这种算法具有较快的收敛性,但是其运行时间和NSGA相比没有多少改善。     

机间数据链系统的功率分配控制方法

针对想定战场中机间数据链网络通信模型的上行链路功率控制问题,采用了一种基于多目标灰狼算法(Multi-objective Grey Wolf Optimizer,MOGWO)的功率控制方法.将功率控制建模为多目标优化问题,以最小化上行链路中各节点功率、使各节点在接收机处的信干噪比值(Signal-to-In-terfe...     

基于改进烟花算法的多目标多机器人任务分配

多机器人任务规划是多机器人系统研究的主要问题之一,多目标多机器人任务规划是指同时对多机器人系统的多个指标进行优化。近年来,启发式算法越来越多地被用来解决多目标问题。本文提出了一种基于改进烟花算法的多目标多机器人任务分配方法,并详细讨论了多目标解的排序方法和选择策略。为了验证该方法的性能,对7个实例进行了实验,并对该方法和其他四种多目标算法,Non-dominated Sorting Genetic Algorithm II (NSGA-II), Strength Pareto Evolutionary Algorithm 2 (SPEA2),Pareto Envelope-based Selection Algorithm (PESA ) 和一种改进的Strength Pareto Genetic Algorithm 2 (SPGA2)在S-metric指标上进行了比较。实验结果表明,在解集质量、解集覆盖度方面,基于改进烟花算法的多目标多机器人任务分配方法具有明显的优势。      

基于改进遗传算法的多目标JSP调度研究

针对多目标车间作业调度问题(JSP),提出了一种混合遗传算法,将多目标遗传算法得出的初步优化结果作为粒子群算法的初始粒子,利用粒子群算法强化局部搜索,加快收敛速度,改善了简单遗传算法局部搜索能力差、迭代效率低的问题.仿真结果表明了该算法对JSP调度的良好效果.     

基于膜量子布谷鸟搜索的双通道网络频谱资源分配

无线双通道Ad Hoc网络中, 有效分配簇间码分频谱资源是提高资源利用效率的关键技术之一.综合考虑子簇码分频谱资源需求和分配公平性, 给出了簇间码分频谱资源分配数学模型, 并转换为以最大化码分频谱资源效益和分配公平性为多目标的受约束离散优化问题.结合膜结构、量子计算和布谷鸟搜索算法, 提出一种新的离散组合优化算法——膜量子布谷鸟搜索算法.该算法使用量子鸟窝表征问题潜在解, 利用布谷鸟寻窝产卵的演化方法在基础膜中寻求单目标最优解, 通过膜间信息共享和非支配解等级排序求出具有多目标最优解的表层膜Pareto前端解集.仿真结果证明, 与经典优化算法相比, 该算法不仅能够同时求解单目标和多目标最优解, 而且具有更优的收敛性能, 能更好地实现码分频谱资源效益最优化.     

基于生态种群捕获竞争模型的多目标Memetic优化算法

本文针对复杂多目标优化问题Pareto前沿搜索难度大的特点,设计了一种结合多种群间捕获竞争、强化学习机制的多种群Memetic学习策略与进化计算模型.受种群进化、捕食种群与被捕食群体间的竞争等生态学原理的启发,提出了一种基于生态种群捕获竞争模型的多目标Memetic优化算法(Multi-Objective Memetic Algorithm based on Ecological Population Preying-competition Model,ECPM-MOMA).ECPM-MOMA算法设计并运用了捕获竞争、强化学习算子进行全局搜索,在种群进化过程中结合了Memetic搜索算子进行局部搜索.理论分析与实验结果表明,本文所提出的算法具有良好的收敛性能和分布特征,生态种群捕获竞争策略与进化计算模型对于解决复杂多目标优化问题是有效的.     

Research on optimal two element exchange algorithm for large scale cloud computing server scheduling problem

With the flourishing of cloud computing industry,the rational management and scientific scheduling of cloud computing servers has become an important issue.In terms of model,a new mixed integer programming (MIP) model with affinity constraints and anti-affinity constraints was proposed to describe the scheduling problem of large scale cloud computing server.Considering the time cost of solving large-scale MIP problems,an optimal two element exchange algorithm was designed with the basics of branch and bound method and local search algorithm.By constantly extracting MIP sub-problems from completing scheduling problems and using branch and bound method to solve the sub-problems,the algorithm continuously optimized the server scheduling schemes,so that the scheduling schemes approached the optimal solution.The experimental results show that the algorithm has great advantages over the other methods in testing data set ALISS,and can reduce the resource consumption of cloud computing center by more than 4% when the same task is completed.     

A genetic algorithm‐based task scheduling for cloud resource crowd‐funding model

With the rapid development of cloud computing, the number of cloud users is growing exponentially. Data centers have come under great pressure, and the problem of power consumption has become increasingly prominent. However, many idle resources that are geographically distributed in the network can be used as resource providers for cloud tasks. These distributed resources may not be able to support the resource‐intensive applications alone because of their limited capacity; however, the capacity will be considerably increased if they can cooperate with each other and share resources. Therefore, in this paper, a new resource‐providing model called “crowd‐funding” is proposed. In the crowd‐funding model, idle resources can be collected to form a virtual resource pool for providing cloud services. Based on this model, a new task scheduling algorithm is proposed, RC‐GA (genetic algorithm for task scheduling based on a resource crowd‐funding model). For crowd‐funding, the resources come from different heterogeneous devices, so the resource stability should be considered different. The scheduling targets of the RC‐GA are designed to increase the stability of task execution and reduce power consumption at the same time. In addition, to reduce random errors in the evolution process, the roulette wheel selection operator of the genetic algorithm is improved. The experiment shows that the RC‐GA can achieve good results.     

Segment-Adaptive Spread Spectrum Audio Watermarking Using NSGA-Ⅱ

In the field of robust audio watermarking,how to seek a good trade-off between robustness and imperceptibility is challenging.The existing studies use the same embedding parameter for each part of the audio signal,which ignores that different parts may have different requirements for embedding parameters.In this work,the constraints on imperceptibility are first analysed.Then,we present a segment multi-objective optimization model of the scaling parameter under the constrained Signal-to-noise ratio (SNR) in Spread spectrum (SS)audio watermarking.Additionally,we adopt the Non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ) to solve the proposed model.Finally,we compare our algorithm(called SS-SNR-NSGA-Ⅱ) with the existing methods.The experimental results show that the proposed SS-SNR-NSGA-Ⅱ not only provides flexible choices for different application demands but also achieves more and better trade-offs between imperceptibility and robustness.     

基于多目标优化的无线传感器网络移动充电及数据收集算法

近年来,通过引入移动设备(ME)为无线传感器网络(WSNs)进行无线充电和数据收集成为一个研究热点。传统方法一般先根据节点的充电需求优先级确定移动路径,再根据该路径依次对节点进行数据收集。该文同时考虑充电需求和数据收集两个维度,以最大化ME的总能量利用率和最小化数据收集平均时延为目标,建立多目标一对多充电及数据收集模型。在ME携带的行驶能量和充电能量不足的前提下,设计路径规划策略和均衡化充电策略,并改进多目标蚁群算法对该文问题进行求解。实验结果表明,该文算法在多种场景下的目标值、Pareto解的数量、Pareto解集的均匀性、分布范围等性能指标均优于NSGA-II算法。     

无线传感器网络优化的任务管理算法研究

该文针对多跳分簇无线传感器网络多节点协同式并行处理应用,提出了一种新的基于改进粒子群优化算法的任务管理算法,该算法建立了基于复制的变异操作,并采用基于熵权的逼近理想解的排序法对算法结果进行客观评价与择优。详述了算法的各个要素,仿真结果证实,算法搜索效率高、可获得多目标优化的任务分配与调度解,且比文献中提出的其他算法的解性能优越。     

布谷鸟粒子群优化算法的多目标任务调度

高效的调度方法促使云计算更快更好地服务,一般采用优化算法来解决云计算中的调度问题。将布谷鸟搜索(CS)和粒子群优化(PSO)两种算法相结合,提出多目标布谷鸟粒子群优化算法(MO-CPSO),主要目的是提高云计算的服务质量。使用Cloudsim仿真工具对MO-CPSO算法的性能进行了评估。仿真结果表明,与CS、ACO和Min-Min算法相比,MO-CPSO算法使makespan、开销和截止时间违背率均最小。