基于信号波形协同提高无线通信系统容量的研究

针对有限频谱资源与迅速增长业务需求的矛盾,提出了一种基于信号波形协同的无线通信技术。在传统正弦载波通信系统的基础上,在相同的频谱范围内利用正弦信号和线性调频信号在频域和分数域能量积聚特性的对偶关系在正弦载波通信信号上叠加线性调频信号波形来传输不同的用户信息,并在接收端分别通过频域和分数域滤波处理实现两类用户信号波形的分别提取,从而达到提高频谱效率和增加系统容量的目的。建立了系统模型,给出了理论分析,并进行了数值验证。研究结果表明,在传统正弦载波通信体制的基础上,通过信号波形协同和变换域滤波处理可以有效地提高频谱效率,理论上能够将系统容量提升近一倍。     

巧借媒体资源 推进基础研究

以平面媒体的代表——《人民日报》为例,分析了大众传媒在基础研究中的地位和作用,提出了如何借助媒体推进基础研究的建议,包括：要区分不同目标,选择相应媒体,紧密配合媒体,选择合适的报道方式和途径,邀请记者提前介入相关基础研究采访,主动对媒体进行专业培训和科普。     

Resource allocation on condition of random resource demand of network activities

A general network model is considered. Each activity may require several storable and productive resources. Fixed amounts of storable resources are delivered at fixed times. The capacities of the productive resources are assumed to be constant. A general resource allocation problem is derived in order to optimize the cost for the execution of the network activities, In the main, the case is considered where the resource demands of the activities are random variables. For this case, the means of resource demands are estimated and a method is presented to obtain a vector of start times and durations of the activities so that a cost function is minimized and the probability that, at any time, there appears no lack of resources is maximized.     

Design of intermodal logistics networks with hub delays

In an intermodal hub network, cost benefits can be achieved through the use of intermodal shipments and the economies of scale due to consolidation of flows at the hubs. However, due to limited resources at the logistics hubs, shipment delays may affect the service performance. In this research hub operations are modeled as a GI/G/1 queuing network and the shipments as multiple job classes with deterministic routings. By integrating the hub operation queuing model and the hub location-allocation model, the effect of limited hub resources on the design of intermodal logistics networks under service time requirements is investigated. The managerial insights gained from a study of 25-city road-rail intermodal logistics network show that the level of available hub resources significantly affects the logistics network structure in terms of number and location of hubs, total network costs, choice of single-hub and inter-hub shipments and service performance.     

可变集—可变模糊集的发展及其在水资源系统中的应用

将可变模糊集理论,从模糊系统发展到可变模糊一清晰系统.给出可变集的对立公理与可变集定义,给出基于可变集的唯物辩证法三大基本规律的数学定理对立统一、质量互变与否定的否定定理.给出可变集在地区水资源可持续利用程度变化与发展态势的评估价原理、方法与应用实例.不仅对技术科学,而且对哲学等科学均有重要的科学意义.     

基于综合模拟法与支持向量机的水资源预警分析

提出并确定了哈尔滨市水资源可持续利用预警指标的警度.利用反馈法确定了预警指标的警限,采用2次检验的方法对其预警有效性进行了检验,设计了预警信号灯系统,并对哈尔滨市水资源可持续利用进行监测预警;运用支持向量机的方法预警指标值进行预测,对哈尔滨市水资源可持续利用进行趋势预警,包括单指标趋势预警和多指标趋势预警,进而获得了趋势预警的结果.     

一种基于拍卖的无线网络资源分配方法的研究

随着Internet 应用的迅猛发展,网络资源相对匮乏的问题日渐突出,如何合理分配有限的资源为不同服务质量需求的应用提供服务, 提高资源使用效率是亟待解决的问题.分析了目前网络资源分配的特点,给出了采用拍卖作为利用市场机制实现网络资源有效配置的首选方案的原因,提出了一种基于累进第二价格模型(PSP)拍卖机制的分配方法,采用可变的保留价格(reserve price),同时定义最小效用和最小数据需求,实现了两个目的:一是最大用户群体中的满意用户的数量,其次最大化系统的吞吐量.     

武汉城市圈信息资源共享网络联盟研究

武汉城市圈信息资源共享网络呈垂直分布,不利于跨系统、跨地域信息资源充分共享.建立一个实质性的图书馆联盟,是发展武汉城市圈信息资源共享网络的有效途径.     

A note on oligopoly exploitation of common-pool renewable resources

This note derives the linear Feedback Nash equilibrium of a differential oligopoly game of exploitation of a common-pool renewable resource, and compares and contrasts it with social optimum. The case of regulated entry by means of a license fee is also considered. Two main results are derived. First, the steady-state oligopoly price can be increasing in the (exogenously given) number of firms. Second, an optimal license fee exists that induces the (endogenously given) number of firms to behave efficiently.     

Modelling systems with renewable resources based on functional operators with shift

A method for the study of systems with renewable resources is proposed. The individual and the group parameters are separated and a discretization of time is carried out. We obtain equilibrium proportions which are functional equations with shift. A cyclic model and an open model are considered. Conditions for the existence and uniqueness of the solution are formulated for the cyclic model. For the open model, the system’s evolution is analyzed.