Echo-state-network classification based multi-services awareness in high-speed optical passive networks

With the challenge of great growing of services diversity,service-oriented supporting ability is required by current high-speed passive optical network (PON).Aimed at enhancing the quality of service (QoS) brought by diversified-services,this study proposes an echo state network (ESN) based multi-service awareness mechanism in 10-Gigabite ethernet passive optical network (10G-EPON).In the proposed approach,distributed architecture is adopted to realize this ESN based multi-service awareness.According to the network architecture of 10G-EPON,where a main ESN is running in OLT and a number of ESN agents works in ONUs.The main-ESN plays the main function of service-awareness from the total view of various kinds of services in 10G-EPON system,by full ESN training.Then,the reservoir information of well-trained ESN in OLT will be broadcasted to all ONUs and those ESN agents working in ONUs are allowed to conduct independent service-awareness function.Thus,resources allocation and transport policy are both determined only in ONUs.Simulation results show that the proposed mechanism is able to better support the ability of multiple services.     

水飞蓟种子（果实）形态学及萌发特性研究

系统地对水飞蓟种子进行了形态学和萌发特性的研究,实验结果表明：种子的千粒重分别是18.88 g和21.14 g.长度分别是0.66 cm,0.68 cm,厚度分别是0.16 cm,0.20 cm,宽度分别是0.26 cm,0.28 cm.哈师大植物园的水飞蓟种子在25℃时萌发率较高为90％.绥化中学的水飞蓟种子用赤霉素处理,结果100 ppm处理过的种子在25℃时萌发的比较好,萌发率为48％.     

小议堆石坝填筑施工质量GPS监控技术

近年来,随着高面板堆石坝施工质量的要求越来越高,作为企业,必须采取一切措施,来应对市场,适应环境的变化,为此,大多数企业采用分析质量管理参数和依托技术,提出了堆石坝填筑施工质量GPS(全球定位系统)实时监控系统,这是以全球卫星定位系统为基础的,这一技术的实施与运用,为堆石坝施工技术开辟了新的发展道路,为此,本文将对此技术做一些初步的相关分析,以便为工程施工提供指导作用。     

面向节能控制的楼宇机理模型仿真研究

由于现有建筑系统能源消耗大,控制系统复杂,电力成本高,为降低电力成本,搭建建筑的机理模型进行仿真。为证明建立的模型适用于建筑系统,对模型的准确性进行仿真验证。通过对比恒定电价与时变电价的加热功率,可以看出系统通过模型预测控制能随着时间的推移响应电力价格的变化,进而很好地控制电力成本,节约能源。     

重加工具有退化与学习现象的单机批排序问题

本文对同一台机器下次品工件可重加工生产的问题进行研究。工件要求成批加工,每批包括连续加工的两个子批。第一子批的工件加工后,一部分工件是按照要求得到的优良品,另一部分工件是次品。次品的工件接着在第二子批重加工,而次品工件在等待重加工时会产生退化与学习现象,加工完成后得到的工件是优良品。同一子批的工件同时完工,工件的完工时间是该子批中最后一个工件的完工时间。假设每批生产的工件次品率是相同的。每一批工件开始加工和重加工时都有安装时间。目标函数是使总安装时间,重加工和库存持续费用最小,并且优良品工件的需求得到满足。对于该问题的一般情形给出了动态规划算法。接着当批工件的完工时间和批的规模满足一致关系,给出多项时间算法。
     

Physical layer impairments tolerance based lightpath provision in software defined optical network

As all-optical networks grow with ever increasing ultra-high speed, the communication quality suffers seriously from physical layer impairments ( PLIs) .The same problem still exists in software defined optical network ( SDON) controlled by OpenFlow.Aimed to solve this problem, a PLIs tol-erance based lightpath provision scheme is proposed for OpenFlow controlled optical networks.This proposed approach not only takes the OSNR model to represent those linear PLIs factors, but also in-troduces those nonlinear factors into the OSNR model.Thus, the proposed scheme is able to cover most PLIs factors of each optical link and conduct optical lightpath provison with better communica-tion quality.Moreover, PLIs tolerance model is also set up and considered in this work with some necessary extension to OpenFlow protocols to achieve better compatibility between physical layer im-pairments factors and various services connections.Simulation results show that the proposed scheme is able to get better performance in terms of packet loss rate and connection setup time.     

略谈磁性指向器的形制

司南是最早的磁性指向器.北宋时期,磁化技术的突破,导致磁性指向器的形制有了新的演变,其中,用针指向是磁性指向器形制最重要的改进.指南针的出现,极大提高了磁性指向器的指向精度,加快了磁偏现象的发现.之后,指南针的形制仍不断被改进,指南鱼发展成水罗盘,用以指向的木刻鱼被穿上小木条的磁针取代,"指南鱼"的形制消失;指南龟发展成枢轴支承式,成了旱罗盘.本文对磁性指向器的发明和演进过程稍作梳理,希望对帮助广大读者了解这一问题能够有所裨益.     

介质流向对截止阀流场和流阻特性的影响

为探索介质流向对截止阀内部流场和流阻特性的影响,应用SOLIDWORKS软件建立截止阀的三维模型。使用Fluent软件中的有限元法和标准k-ε湍流模型,在不同开度的情况下,采用数值模拟分析的方法,研究不同介质流向下截止阀的流场和流阻特性,分析阀体内部的速度和压力分布规律。结果表明:在两种不同的流向下,阀门的流通能力相差较小;在小开度时,介质高进低出时能够减小阀门的压力损失,在流通高压介质的情况下,高进低出的流向能够极大的减小阀门的关闭力。流场的分析为截止阀的结构设计和优化提供参考。     

走出我国公共部门人力资源绩效考核的困境

文章从我国公共部门人力资源绩效考核面临的现实问题入手，针对现有的考核体系作了比较系统的思考，并给出了相应的建议和措施。     

Optimal multi-asset investment with no-shorting constraint under mean-variance criterion for an insurer

This paper considers the optimal investment strategy for an insurer under the criterion of mean-variance. The risk process is a compound Poisson process and the insurer can invest in a risk-free asset and multiple risky assets. This paper obtains the optimal investment policy using the stochastic linear quadratic (LQ) control theory with no-shorting constraint. Then the efficient strategy (optimal investment strategy) and efficient frontier are derived explicitly by a verification theorem with the viscosity solution of Hamilton-Jacobi-Bellman (HJB) equation.