一种云数据中心资源的动态综合负载均衡调度算法

One of the challenging scheduling problems in Cloud data centers is to take the allocation and migration of reconfigurable virtual machines as well as the integrated features of hosting physical machines into consideration. We introduce a Dynamic and Integrated Resource Scheduling algorithm (DAIRS) for Cloud data centers . Unlike traditional loadbalance scheduling algorithms which often consider only one factor such as the CPU load in physical servers , DAIRS treats CPU, memory and network bandwidth integrated for both physical machines and virtual machines . We develop integrated measurement for the total imbalance level of a Cloud datacenter as well as the average imbalance level of each server. Simulation results show that DAIRS has good performance with regard to total imbalance level, average imbalance level of each server, as well as overall running time.     

Furthest reach of a uniform cantilevered elastica

A uniform elastic cantilever is subjected to a uniformly distributed load or a concentrated load at its tip. The angle of the fixed end with the horizontal is varied until the maximum horizontal distance (projection) from the fixed end to the horizontal location of the tip is attained. The beam is modeled as an inextensible elastica, and numerical results are obtained with the use of a shooting method. For the optimal solution (furthest reach), the tip is below the level of the fixed end. Experiments are conducted to verify the analysis for a heavy cantilever (i.e., only subjected to its self-weight).     

A novel tunable gain CMOS buffer amplifier for large resistive loads

An all-OTA analog buffer amplifier configuration capable of driving large resistive loads is presented. The proposed configuration features high input swing, gain tunability, wide-bandwidth, and low design complexity. The concept is validated with simulation results in Cadence Virtuoso using SCL 0.18-μm technology parameters. Using a ±0.9 V power supply, the buffer with a gain of 1, can drive a 1 V_p−p sinusoid into a 50 Ω load with a THD of better than 0.015%, with a 3-dB bandwidth of 1.55 GHz and consumes 9 mW. The proposed configuration is demonstrated with gain values varying from 0.25 V/V to 5 V/V and with different load values 16 Ω to 5.6 kΩ. The voltage gain is tunable over more than a decade with reasonable power levels. With low-gain OTA, the proposed buffer configuration works well without any complex frequency compensation circuit that makes the all-OTA analog buffer amplifier configuration simple compared to the existing buffer amplifiers.     

交通荷载下沥青路面车辙三维非线性有限元分析

建立了半刚性沥青路面和柔性沥青路面的三维有限元模型,采用非线性粘弹塑性理论分析了不同交通荷载对沥青路面车辙变形和切应力的影响,并考虑了刹车、路面纵坡对路面车辙的影响。结果表明:在相同荷载作用下,两种路面结构的车辙变形和切应力分布随着路面深度呈非线性分布,但不同路面结构对交通荷载变化的敏感性存在较大的差异;不同的胎压、轮载以及刹车产生的水平力对路面车辙变形有着较大的影响。当胎压为1 050 kPa及轮载为62.5 kN时,路面产生的车辙都大于在标准荷载及标准胎压时路面产生的车辙;在坡度为1%～6%时,路面纵坡对沥青路面车辙深度的影响不明显;在坡道上行车(特别是下行)时刹车是路面车辙过大的主要原因。     

Polarimetric distributed Bragg reflector fiber laser sensor array for simultaneous measurement of transverse load and temperature

A polarimetric fiber laser sensor array based on wavelength/beat frequency hybrid interrogation approach for simultaneous measurement of transverse load and temperature is presented and experimentally demonstrated. Operation principle of the hybrid interrogation approach has been theoretically analyzed, which is validated by our experimental results. The shift of beat frequency and laser wavelength in response to the change of transverse load and temperature allows for simultaneous dual-parameter discrimination. Experimental results indicate that laser beat frequency is highly sensitive to transverse load and temperature while laser wavelength is insensitive to transverse load. And the temperature sensitivities of laser wavelength have the same magnitude as common FBG sensors. The proposed active sensor array with simple configuration has considerable potential applications for future fiber sensor networks.     

Free vibration and stability of tapered Euler–Bernoulli beams made of axially functionally graded materials

The free vibration and stability of axially functionally graded tapered Euler–Bernoulli beams are studied through solving the governing differential equations of motion. Observing the fact that the conventional differential transform method (DTM) does not necessarily converge to satisfactory results, a new approach based on DTM called differential transform element method (DTEM) is introduced which considerably improves the convergence rate of the method. In addition to DTEM, differential quadrature element method of lowest-order (DQEL) is used to solve the governing differential equation, as well. Carrying out several numerical examples, the competency of DQEL and DTEM in determination of free longitudinal and free transverse frequencies and critical buckling load of tapered Euler–Bernoulli beams made of axially functionally graded materials is verified.     

云环境下基于Min-Min改进的任务调度算法

在Min-Min的基础上,针对所存在的缺陷,提出了一种负载均衡的改进算法.仿真实验表明,在一定条件下,改进后的算法比传统的算法有一定的提高.     

临时烟囱在坑口发电公司的设计及安装

通辽霍林河坑口发电有限责任公司（以下简称“坑口发电公司”）现有两台600MW汽轮发电机组，共用1根烟囱。国家工业建构筑物质量安全监督检验中心于2014年9月对砖套筒和钢平台进行了现场的相关检测检查及安全性评估鉴定，检测鉴定结果为该烟囱不符合国家现行标准规范的可靠性要求，影响整体安全。坑口发电公司计划2015年实施工期120天的烟囱防腐改造工程。为实现烟囱防腐改造期间机组能够正常运行，在该项目实施前要完成两台机组临时烟囱的设计及安装工作。本文从临时烟囱的设计、安装、工期进度及施工安全质量等几个方面进行了阐述。2015年12月18日坑口发电公司烟囱防腐改造工程结束，烟囱投入运行，2016年3月31日1号机组临时烟囱完成封闭工作。至此，1号、2号机组临时烟囱全部退出运行。