A nonextensive approach to the dynamics of financial observables

We present results about financial market observables, specifically returns and traded volumes. They are obtained within the current nonextensive statistical mechanical framework based on the entropy . More precisely, we present stochastic dynamical mechanisms which mimic probability density functions empirically observed. These mechanisms provide possible interpretations for the emergence of the entropic indices q in the time evolution of the corresponding observables. In addition to this, through multi-fractal analysis of return time series, we verify that the dual relation q_stat+q_sens=2 is numerically satisfied, q_stat and q_sens being associated to the probability density function and to the sensitivity to initial conditions respectively. This type of simple relation, whose understanding remains ellusive, has been empirically verified in various other systems.     

Efficient optimisation of per-channel pre-compensation in WDM 20-Gbit/s RZ-DPSK transmission in non-slope matched submarine links

We propose a computationally efficient method to the per-channel dispersion optimisation applied to 50 GHz-spaced N × 20-Gbit/s wavelength division multiplexing return-to-zero differential phase shift keying transmission in non-zero dispersion-shifted fibre based submarine systems.     

Clusters in weighted macroeconomic networks: the EU case. Introducing the overlapping index of GDP/capita fluctuation correlations

GDP/capita correlations are investigated in various time windows (TW), for the time interval 1990–2005. The target group of countries is the set of 25 EU members, 15 till 2004 plus the 10 countries which joined EU later on. The TW-means of the statistical correlation coefficients are taken as the weights (links) of a fully connected network having the countries as nodes. Thereafter we define and introduce the overlapping index of weighted network nodes. A cluster structure of EU countries is derived from the statistically relevant eigenvalues and eigenvectors of the adjacency matrix. This may be considered to yield some information about the structure, stability and evolution of the EU country clusters in a macroeconomic sense.     

医疗设备管理及维修经验心得简述

在本文中,笔者将立足于自身医疗设备管理及维修方面的经验和心得,进行探讨如何进一步完善医院医疗设备的管理和维修工作的水平和质量.从而发挥医疗设备应用过程中的有效性和可靠性,保证医疗设备的使用寿命和使用效率,对医院综合实力进行提高.     

The Efficiency of Engineering Traffic Across Network Boundaries

With the arrival of wideband packet and circuit-oriented data services, it becomes a challenge to provide efficiently the desired quality of service for speech, packet data, and real-time data on a network. As these diverse networks will coexist, architectural studies on integrated heterogeneous networks suggest that a common radio resource manager be used to coordinate radio resource allocation between diverse network types. Initial studies show that supernets, which engineer traffic across wireless networks, are more efficient than operating separate cellular/wireless networks. Increased sharing occurs in supernets because a larger number of services compete for a larger pool of resources. If sharing can be shown to be efficient in general, then supernets should likewise be more efficient. This study decomposes the two-dimensional Markov chain to prove when sharing is beneficial and when it is not.     

数字微波动力环境监控系统方案

介绍数字微波站动力设备及环境监控系统监控的主要内容,监控系统的设计,监控设备的配置及监控系统的分级管理,阐述了微波监控中心的功能及下属各个微波站监控系统的设计和配置。     

数字电视用户管理模式探讨

近年来有线电视数字化已经在全国各地铺展开来,如何有效地进行数字电视用户管理成为一个新的课题摆在我们面前。主要介绍了三门县对数字电视用户管理模式的探索以及具体细节的探讨。     

泛在、移动互联网的体系结构

文章针对现有互联网由于原始设计模式方面的不足,难以满足泛在、移动用户的多元化网络服务需求的问题,创造性地提出全新的泛在、移动互联网体系理论与总体框架;创建一种。基础设施层。模型与理论,解决用户在任何地点、任何时间、以任何方式接入到互联网的问题;建立一种。普适服务层”模型与理论,实现对普适服务的支持;并提出新网络体系下的移动性管理机制。新的网络体系结构可克服现有互联网存在的弊端,有效满足泛在、移动方面的多元化网络服务需求。     

基于J2EE多层架构的特种设备技术服务信息管理系统设计

特种设备技术服务是指特种设备检验检测机构提供的、不含法定检验在内的、出具税票的各类检验检测、咨询、场车型式试验、鉴定评审、锅炉热效率详细测试和简单测试、节能系统测试核工程改造等业务。针对特种设备技术服务业务特点,设计一个基于B/S架构的特种设备技术服务管理系统。采用J2EE分布式开发平台,实现业务逻辑和业务数据相分离的多层体系结构,增强系统的稳定性、可扩展性和可移植性,为各类特种设备检验检测机构提供了一种切实有效的技术服务管理方案。     

Information and Telecommunications Project for a Digital City: A Brazilian case study

Making information and telecommunications available is a permanent challenge for cities concerned to their social, urban and local planning and development, focused on life quality of their citizens and on the effectiveness of public management. Such a challenge requires the involvement of everyone in the city. The objective is to describe the information and telecommunications project from the planning of a digital city carried out in Vinhedo-SP, Brazil. It was built as a telecommunications infrastructure of the kind of “open access metropolitan area networks” which enables the integration of citizens in a single telecommunications environment. The research methodology was emphasized by a case study which turned to be a research-action, comprising the municipal administration and its local units. The results achieved describe, by means of a methodology, the phases, sub-phases, activities, approval points and resulting products, and formalize their respective challenges and difficulties. The contributions have to do with the practical feasibility of the project and execution of its methodology. The conclusion reiterates the importance of the project, collectively implemented and accepted, as a tool to help the management of cities, in the implementation of Strategic Digital City Projects, in the decisions of public administration managers, and in the quality of life of their citizens.