浅谈路由器及Win2000路由的应用方法

介绍了互联网的核心设备路由器的作用、基本原理及其作为网络连结设备的特点和分类,Win2000服务器路由功能的实现步骤.     

Time Series Properties of the German Production Index

Summary: The production index is an important indicator for assessing the cyclical state of the economy. Unfortunately, the monthly time series is contaminated by many noisy components like seasonal variations, calendar and vacation effects. Only part of those nuisance components are explicitly considered in the seasonal adjustment procedures used by statistical agencies. In this paper, we propose a more flexible specification for the seasonal and working day effects and introduce an indicator for the summer vacations effect. We allow for time-varying parameters and show that the resulting Unobserved Components Model delivers more reliable results for the trend and cycle components of the production index. * I am grateful to a referee and the participants of the ifo Lunchtime Seminar, the Pfingstkonferenz of the Deutsche Statistische Gesellschaft and the annual conference of the Verein für Socialpoltik for helpful comments.     

TESTING FOR PERIODIC STATIONARITY

This paper proposes a test for the null hypothesis of periodic stationarity against the alternative hypothesis of periodic integration. We derive the limiting distribution of the test statistic and its characteristic function, which are the same as those of the test developed in Kwiatkowski, Phillips, Schmidt and Shin.[15] We find that some parameters, which we must assume under the alternative, have an important effect on the limiting power, so we should choose such parameters carefully. A Monte Carlo simulation reveals that the test has reasonable power but may be affected by the lag truncation parameter that is used for the correction of nuisance parameters.     

MANAGING CREDIT BUBBLES

We study a dynamic economy where credit is limited by insufficient collateral and, as a result, investment and output are too low. In this environment, changes in investor sentiment or market expectations can give rise to credit bubbles, that is, expansions in credit that are backed not by expectations of future profits (i.e., fundamental collateral), but instead by expectations of future credit (i.e., bubbly collateral). Credit bubbles raise the availability of credit for entrepreneurs: this is the crowding‐in effect. However, entrepreneurs must also use some of this credit to cancel past credit: this is the crowding‐out effect. There is an “optimal” bubble size that trades off these two effects and maximizes long‐run output and consumption. The equilibrium bubble size depends on investor sentiment, however, and it typically does not coincide with the “optimal” bubble size. This provides a new rationale for macroprudential policy. A credit management agency (CMA) can replicate the “optimal” bubble by taxing credit when the equilibrium bubble is too high and subsidizing credit when the equilibrium bubble is too low. This leaning‐against‐the‐wind policy maximizes output and consumption. Moreover, the same conditions that make this policy desirable guarantee that a CMA has the resources to implement it.     

Learning from the ‘Trojan horse’? The arrival of ‘Anti-Social Behaviour Orders’ in Ireland

The Republic of Ireland is about to introduce Anti-Social Behaviour Orders (ASBOs) similar to those introduced in England under the Crime and Disorder Act 1998. Following Bourdieu and Wacquant, it is maintained that England is apt to play the role of a ‘Trojan horse’ transporting American responses to crime and ‘disorder’ into Europe. Moreover, the perspective of Bourdieu and Wacquant provides a more political and complete account of ‘policy transfer’ dynamics than is provided in most mainstream accounts. Nonetheless, there is still a need to recognise the sheer complexity of ‘policy transfers’ and, in the case of ASBOs, the particular Irish and wider European contexts are immensely significant. It is maintained that social workers and associated social professions in Ireland should support the Irish Coalition Against ASBOs as part of a strategy which seeks to promote social policies which are more in keeping with the aims of the International Federation of Social Workers.     

Cyclical variations in unemployment duration

In this paper I study how individual unemployment durations vary over the business cycle, using unemployment spells of a sample of Danish workers. A compositional, an outflow, and a residual calendar-time component are identified, and they all contribute to explaining the variations in unemployment duration. Based on the analysis it is concluded that long-term unemployment is a phenomenon that is associated with periods of high unemployment, but nothing should prevent the long-term unemployed finding jobs again as aggregate unemployment eventually starts falling. In particular, there is no evidence of negative duration dependence, not even at long durations, and not when aggregate unemployment is high. Received: 7 December 1998/Accepted: 24 August 1999     

Three enigmatic examples and inference from likelihood

Statistics has many inference procedures for examining a model with data to obtain information concerning the value of a parameter of interest. If these give different results for the same model and data, one can reasonably want a satisfactory explanation. Over the last eighty years, three very simple examples have appeared intermittently in the literature, often with contradictory or misleading results; these enigmatic examples come from Cox, Behrens, and Box & Cox. The procedures in some generality begin with an observed likelihood function, which is known to provide just first order accuracy unless there is additional information that calibrates the parameter. In particular, default Bayes analysis seeks such calibration in the form of a model‐based prior; such a prior with second order accuracy is examined for the Behrens problem, but none seems available for the Box and Cox problem. Alternatively, higher‐order likelihood theory obtains such information by examining likelihood at and near the data and achieves third order accuracy. We examine both Bayesian and frequentist procedures in the context of the three enigmatic examples; simulations support the indicated accuracies. The Canadian Journal of Statistics © 2009 Statistical Society of Canada     

Exponential random graph models for management research: A case study of executive recruitment

We introduce a recent development in the statistical analysis of relational data that offers rigorous discrimination of a variety of structural and behavioural effects of interest to management research. Exponential random graph models account for the highly interdependent nature of network data that are problematic for the predominant inferential statistical analysis used in management research. We illustrate the value of the approach with an application focused on executive recruitment by large UK firms, modelling migrations of managers among firms as a network of relationships. We find rigorous statistical support for the influences of industry origin in executive recruitment, particularly in relation to legal and accounting activities. The flexibility and sophisticated relational variables available in the models offer considerable analytical power of value to a wide range of management applications.     

基于C语言的压电式喷墨打印机驱动程序设计

压电式喷墨打印机是现在市面上最流行的打印机之一。首先分析了压电式喷墨打印机的工作原理,接着测试压电式喷墨打印机,并绘制出其工作时序图,剖析其逻辑关系,在此基础之上利用STM32F105开发板和IAR Embedded Workbench For ARM5.40开发工具搭建开发环境,完成了压电式喷墨打印机的驱动程序的研发,测试表明达到了预期效果。     

Windows 98注册表的组成结构及修复

本文介绍了Windows 98注册表的组成结构 ,阐述了几种对Windows 98注册表维护和修复的方法