Light-weighted services awareness scheme of the IP and optical converged network

As internet services newly emerge with diversity and complexity, great challenges and demands are presented to both IP network and optical network to support various services. Aimed to solve this problem, this paper proposes a light-weighted echo-state-network (LW-ESN) based services awareness scheme of the software defined IP and optical converged network. This LW-ESN model adopts the ring topology structure inside and generates the probability output result to determine the quality of service policy of IP and optical converged network. Moreover, the LW-ESN based service awareness engine is also designed in controller node of IP and optical converged network to perform services awareness by obtaining service traffic parameters from IP and optical layers, together with necessary working procedure. Simulation results show that the proposed approach is able to improve the services-oriented supporting ability in terms of blocking rate and delay time.     

试议土地资源管理利用

现在的社会经济发展越来越快,土地资源的浪费和紧缺也越来越严重,因此人地会出现矛盾,面对这样的问题,土地资源的科学性和合理性,也就成为重要的工作。本文就针对土地资源管理利用存在的问题以及产生原因进行分析和阐述,指出土地资源管理如何加强的措施和建议。中-1643158．htm     

低压电力线通信导致漏电保护器误跳闸问题探讨

针对国内部分用电信息采集用户出现的漏电保护器误跳闸现象,介绍了漏电保护器原理和跳闸现场情况,分析了低压电力线载波台区线路结构、信号传输和导致漏电保护器误跳闸的影响因素,并重点从载波通信影响量大小和漏电保护器抗扰性两方面进行了理论分析和实验验证,从而得出了漏电保护器误跳闸受其自身抗扰能力、载波信号特征、电缆及设备绝缘能力、电网噪声等因素影响,其中载波信号仅是导致抗扰能力较弱漏电保护器误跳闸的原因之一,而提高漏电保护器自身的抗扰能力和设计不足是解决漏电保护器误跳闸的较佳措施。     

不同种类炭黑对人防门海绵橡胶性能的影响

以三元乙丙橡胶(EPDM)作为橡胶主体材料,加入不同种类炭黑以及其他原料,通过热空气自由发泡,制备海绵橡胶。通过探讨不同种类炭黑在橡胶中的分散情况,以及对海绵橡胶硫化发泡特性、加工性能、物理性能的影响,结果表明,炭黑N550在橡胶中的分散效果最好,炭黑N120的分散效果较差;炭黑N550填充的海绵橡胶的硫化速率与发泡剂分解速率匹配较好,海绵橡胶密度小,发泡倍率大;炭黑N120的Payne效应最明显,海绵橡胶的力学性能最好。     

基于电力无线专网的用电信息采集业务接入控制方法

随着智能电网通信终端数量和业务的迅速增长,LTE电力无线专网的接入控制已成为海量业务的重要瓶颈,其接入时延、阻塞率和资源利用率在一定程度上影响了电力业务的可靠性和实时性。针对大规模用电信息采集业务,提出了一种电力数据分组业务的无线接入控制方法。首先提出了面向用电信息采集的电力无线专网系统架构,其次结合智能配用电业务的特点,建立电力数据分组业务的无线接入控制模型,最后进行仿真验证。仿真结果表明,所提出的用电信息采集业务接入控制机制,能有效提升电力无线专网对业务的可靠高效支持能力。     

基于AMI测量参数的电力线通信组网技术

针对电力线通信信号强度和时延指标无法准确测量,且网络建立过程中缺少路径权值和方向的问题,文章提出了基于AMI测量参数的路径指标间接测量方法。从AMI系统的智能电能表和集中器获取线路电压、电流、相位等测量参数,并以台区负荷中心的测量值为参考,利用基尔霍夫定律计算出不同相线测量点的电压损失大小和方向,也可结合线路材质参数计算出线路距离,从而实现了通信网络路径权值和方向的间接测量。为了验证方法的有效性,提出了一种采用AMI测量参数的p-persistent CSMA洪泛路由算法,实验证明该方法可有效缩短电力线通信网络路径深度和网络时延。     

OSNR comprehensive-awareness model based lightpath control scheme in an OpenFlow controlled all-optical network

To enhance the communication quality of OpenFlow controlled all-optical networks, an optical signal-to-noise ratio comprehensive-awareness (OSNR-CA) model based lightpath control scheme is proposed. This approach transforms main physical-layer optical impairments into OSNR value, and takes this comprehensive OSNR value of the optical signal along the lightpath into consideration, when establishing the lightpath for the connection request using OpenFlow protocol. Moreover, the proposed scheme makes full advantages of the OSNR monitoring function in each node, and assigns the lightpath according to the comprehensive-OSNR value by extending messages of OpenFlow protocol, in order to guarantee the reliable establishment of the lightpath. The simulation results show that the proposed scheme has better performance in terms of packet loss rate and lightpath establishment time.     

基于海燕610微处理器的FTU设计与实现

文章研制了基于"中国芯"和"国网芯"的智能配变终端设备。首先介绍了海燕610微处理器的功能和特点;接着阐述了基于海燕610的馈线终端单元的设计实现方案,并对硬件架构和软件功能进行了讨论,对电能测量模块、开关量采集模块和通信模块的设计进行了详细说明;最后给出了下一步的研究方向,即结合芯片的数据处理能力和专用指令研究简化的故障检测算法。     

1LBS-435型双向耕耙犁

1前言目前,国内外双向犁多为立式翻转,两套犁体,只能翻不能耙,而且悬挂质量大,只能与大马力拖拉机配套使用;现在虽有耕耙复式作业犁,但都是单向作业,存在堑沟和土埂,地表不平。为减少双向犁翻转犁体数,又能同时实现耕耙复式作业,我省研制成功