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近年来,随着国家智慧海洋战略的推进,以及海洋资源开发的需求,基于OFDM调制的水声通信技术得到了飞速发展,其关键问题之一就是主节点如何分配子载波资源以优化系统性能.据此,提出了一种低复杂度的水声OFDM子载波分配算法,以某个准则挑选出每轮待分配的候选节点,选择综合信道状态最差的节点分配子载波,在提高系统整体传输性能... 相似文献
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在正交频分复用技术和双向通信下,研究了携能通信网络中的资源分配问题。提出了一种面向子载波和传输功率的联合分配算法,该算法不依赖于现有的功率分割或时隙切换机制,可以在不同的子载波上分别传输信息和能量,简化了携能机制设计;此外,考虑到实际能量收集电路的饱和特性,该算法基于非线性能量采集模型,采用拉格朗日对偶和次梯度方法,研究了在满足用户传输速率阈值的前提下使系统的总能耗最小化的问题,降低网络能量开销。数值仿真实验证实了此联合分配算法的有效性和能量高效性。 相似文献
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在分析了正交频分复用(OFDM)技术优缺点的基础上提出了单载波频域均衡技术(SC-FDE).SC-FDE系统在保持了OFDM系统性能的同时避免了OFDM的两大问题.接着,在ADS仿真平台上对SC-FDE系统进行了建模和仿真.经过仿真分析得出,通过无线信道后的数据在经过频域均衡模块后可以得到很好的恢复,整个传输模型具有较低的误码率.最后,对OFDM与SC-FDE的误码率曲线就行了对比,证明了SC-FDE所具有的良好性能. 相似文献
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Fong-Gong Wu Ying-Jye Lee Ming-Chyuan Lin 《International Journal of Industrial Ergonomics》2004,33(6):751-569
This study uses the fuzzy analytic hierarchy process (FAHP) approach on a multiple criteria decision-making process made up of rational and emotional choices. The process involves setting evaluation criteria, constructing a fuzzy judgment matrix and weight vector, and then ranking the order of candidate alternatives by a fuzzy number in the fuzzy sequencing vector. This FAHP approach can provide hotel managers with a suitable way to determine the optimum spatial allocation. Also, creation of an artificial spatial allocation image by the image compositing technique allows hotel managers to see the future completed work before renovating, and the emotional judgment of the spatial image can take place immediately. Furthermore, the virtual image facilitates the reduction of communication time between hotel managers and designers and increases the level of satisfaction towards the final spatial allocation.
Relevance to industry
The FAHP approach addressed in this study can be applied to hotels, motels and related spaces where spatial allocation is needed and helps decision-makers or designers to choose the optimum alternative under the consideration of rational and emotional factors. 相似文献
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针对混沌参数调制(CPM)的电力线通信(PLC)中谐波引起的窄带干扰,两阶段动态估计方法根据最小相空间体积(MPSV)准则估计模型参数,计算量大。为此,提出将未知参数合并到增广状态矩阵的联合卡尔曼滤波方法,避免了专门的参数估计过程,在提高增益性能的同时有效降低了计算量。方法的性能通过对混沌电力线通信下的单音干扰和多音干扰的有效抑制得到了验证。 相似文献
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目的:针对目前置乱度评估算法对同一图像置乱算法的评价结果存在多变性,对多个置乱算法不能同时评估的问题,本文提出基于层次分析法的图像置乱评估算法。方法:首先,计算置乱矩阵元素分布的均匀性和随机性程度,获得置乱像素位置分布的属性值,保证了同一置乱算法置乱度的恒定性。然后应用层次分析法,实现置乱度二维属性的整合和多个置乱算法的同时评估。结果:实验结果表明,该算法得到的置乱度只与置乱算法本身和置乱迭代次数相关,和置乱对象无关,结果具有稳定性和有效性,同时算法可给出任意数目置乱算法的置乱度排序。结论:总之,建议算法实现了客观、公平、高效的图像置乱度评估,不仅有利于信息隐藏领域设计者方便快速选择合适的置乱算法,同时也为置乱算法的开发提供了有力的反馈工具。 相似文献
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基于模糊层次分析法的集成软件质量评估模型 总被引:3,自引:1,他引:3
通过建立软件质量点模型和软件质量度量模型,并运用模型集成的方法,构建了软件质量的集成评估模型。通过模型转换方法将其转换为层次分析模型,并针对模型中权重指标难以确定的问题引入了模糊分析的方法。最后通过一个实例验证了该方法的可行性。 相似文献
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Selection of a cleaning system for engine maintenance based on the analytic hierarchy process 总被引:1,自引:0,他引:1
María Socorro García-Cascales María Teresa Lamata 《Computers & Industrial Engineering》2009,56(4):1442-1451
Environmental impact assessment is an intrinsically complex multi-dimensional process which involves multiple criteria and multiple actors. Multi-criteria methods can serve as useful decision aids for carrying out environmental impact assessment. This paper proposes the use of a multi-criteria technique, namely the analytic hierarchy process, as a potential decision-making method for use in management maintenance processes. In this case, our problem concerns the selection of a parts cleaning system for diesel engine maintenance. A hierarchical structure is built for the prequalification of the criteria and the alternatives within the system. By applying the analytic hierarchical process, the criteria can be prioritized and the alternatives can be organized in descending order so that the best parts cleaning system may be selected. 相似文献
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Budgetary allocations of resources are made in all businesses, but their volume and composition vary; and efficient budget allocation is fundamental to flow in businesses. The objective of the allocation problem is to determine the required budget for each department (or section) of a company so as to maximize the sum of the company's benefits. The purpose of this paper is to find a suitable degree of fuzziness for preference rankings and to demonstrate an example of budget allocation using artificial intelligence programming, and fuzzy analytic hierarchy process (FAHP). An efficient budget allocation method using FAHP will be provided for businesses. This method is suitable for use in evaluating proposed policies (including tangible and intangible information). A comparison between FAHP and artificial neural network (ANN) will be also made in this paper.An aerospace company's budget allocation problem is investigated as a case study in this research, which will illustrate how to solve this problem. The case study utilizes a two-stage interview (semi-structured interview and in-depth interview) to select their budget allocations given a number of tangible and intangible criteria. The results from the case study are pertinent to other real-world allocation problems that share many of the characteristics of problems, such as decision makers’ subjective opinions. 相似文献
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以港口作业计算机仿真模型为基础,阐述船舶泊靠港选择中港口这一复杂对象所涉及的主要因素,构造港口选择决策AHP模型层次结构中的准则,建立数学模型进行定量分析,并得到有效验证. 相似文献
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针对模糊层次分析法中存在的模糊判断矩阵一致性检验和修正困难、元素权重计算繁琐的问题,从模糊判断矩阵的定义角度出发,构建了基于粒子群算法的模糊层次分析模型(PSO-FAHP),提出了包含模糊判断矩阵一致性修正及各元素排序过程的非线性带约束优化问题,引入粒子群算法实现了问题的求解,并分析了模型的合理性。最后通过数值算例对比了模型的计算结果,验证了模型的正确性。对模糊层次分析法的实践应用具有一定的指导意义。 相似文献