基于神经网络的系泊系统主动式截断试验仿真

系泊系统主动式截断试验技术对缆索数值模型的求解速度有着较高的要求,而基于集中质量模型或有限元模型的缆索数值模型在计算时需要在每个时间步内迭代求解,因此求解速度缓慢;为解决此问题,采用神经网络辨识得到缆索上端点与截断点运动的时域等价近似模型;该等价模型在每个时间步内无需迭代求解,因此求解速度快于传统的缆索数值模型;同时利用商软OrcaFlex以及Matlab搭建了系泊系统主动式截断试验的仿真平台,将离线辨识得到的神经网络模型代替集中质量模型对缆索截断点运动进行求解;通过对比截断水深以及全水深下张力以及运动结果,说明了神经网络模型代替传统数值模型进行截断点运动计算的可行性。     

电力系统数据整合与网络安全应用

分析了万州供电局能量管理系统(EMS)、电能量计量系统(TMR)的现状,提出了电力数据的整合方案,自动生成反映电网运行和经济凋度的电力调度日报表,探讨了数据整合对两个系统网路安全的影响.     

分布式打印环境和Internet打印技术

该文阐述了分布式打印环境的概念和特点,并对Ｉｎｔｅｒｎｅｔ打印的思想和技术进行了分析和描述,就ＩＰＰ的设计和实现提供了基本方法。     

Performing permutations on interconnection networks by regularlychanging switch states

In this paper, we present an algorithm for performing permutations of messages on multistage interconnection networks. Permutations of messages are needed in many parallel algorithms. The proposed algorithm is feasible for any networks that can connect each input to each output using a set of N nonblocking connections, where N is the number of ports on the network. Messages are segmented into N submessages that are sent independently in each time step. For any permutation, the settings of switches are changed with fixed patterns. Partitioning of the network into independent subnetworks is also supported, each capable of simultaneously routing a different permutation     

Repeated Price Search

Consumers check few sites in online purchases. Previous research and experiments we perform demonstrate that consumers can not calculate the optimal strategy for price search. They use heuristics whose performance is better than random and less than optimal. To investigate online price search performance we survey student online textbook purchases. Students achieve good performance because they start with a good strategy and online market organization of marketplace and meta-search sites. An important factor is that algorithms at sites searched perform calculations that reduce the computational complexity of the search.     

湖泊湿地利用阶段演变的经济学分析——以太湖为例

人类对太湖湿地利用存在多种形式,但是在特定经济发展阶段的主导地位不同,存在太湖湿地利用阶段的演变,这个演变过程是在人类需求和湖泊湿地资源比较优势的共同作用下实现的,是实现丰富的自然资源对相对稀缺的自然资源的替代,是人造资本对自然资本和自然生产力进行替代的过程,是人类对太湖湿地依附性利用向和谐性利用转变的过程。     

Effect of dy on structure and magnetic properties of CoPt alloys

The effects of Dy on the microstructure and magnetic properties of Dy _x Co_50?x Pt₅₀ alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 °C contain only a single A1 (fcc) phase, while the alloys annealed at 675 °C consist of a hard-magnetic face-centered-tetragonal (fct) phase and a magnetically soft face-centered-cube (fcc) phase. Maximum values for the coercivity H _c and remanence ratio m _r were achieved in Dy_0.4Co_49.6Pt₅₀ alloys annealed at 675 °C for 80 min. For the series of Dy _x Co_50?x Pt₅₀ alloys annealed at 675 °C for 60 min, H _c decreases monotonically with increasing Dy concentration, but m _r is first enhanced and then weakened.     

Grigorii Valentinovich Samsonov

Obituaries

Grigorii Valentinovich Samsonov     

基于单片机的电脑弹簧机按键板的设计与实现

电脑弹簧机是用来生产弹簧的专用设备,按键板则是实现对弹簧机控制的一个人机交互的操作界面。本文介绍了电脑弹簧机按键板的设计及实现方法。该按键板采用薄膜面板开关的形式,用PS/2协议作为按键板和主机的通信手段,以单片机AT89S51作为处理芯片,设计灵活,使用方便可靠,具有锁键的功能,很好地满足了工业现场需求。它具有的通用性使得其能广泛应用于以PC机为主机的控制系统中。