Web based surveillance systems could improve disease detection and the response to emerging disease events

The Chinese government should be commended for its open, concerted, and rapid response to the recent H7N9 influenza outbreak. However, the first known case was not reported until 48 days after disease onset.1 Although the difficulties in detecting the virus and the lack of suitable diagnostic methods have been the focus of discussion,2 systematic limitations that may have contributed to this delay have hardly been discussed. The detection speed of surveillance systems is limited by the highly structured nature of information flow and hierarchical organisation of these systems. Flu surveillance usually relies on notification to a central authority of laboratory confirmed cases or presentations to sentinel practices for flu-like illness. Each step in this pathway presents a bottleneck at which information and time can be lost; this limitation must be dealt with...

生产调度理论和方法研究综述

生产调度理论与方法研究是非常困难的课题 ,但是对企业或行业提高生产效率和效益是至关重要的 ,特别是在当前市场经济时代 生产调度理论和方法的研究已经有 5 0多年的历史 ,但是经典调度理论和实际调度问题之间仍然存在着鸿沟 针对这一特点 ,指出了当前实际生产调度存在的一些问题和需要考虑的各种因素 ,例举了主要的生产调度方法和典型应用 ,指出了各种方法的优缺点 最后 ,总结并提出了生产调度理论和方法的未来研究方向和今后工作的建议

Causas de la decadencia del arte musical en México

UANL

El peri??dico literario : un ejemplo pr??ctico con Don Quijote

Resumen basado en el de la autora

As condições NNT e NNR na realização de um referencial

In this paper the theoretical fundamentals related to the introduction of NNT (No Net Translation) and NNR (No Net-Rotation) conditions in the realization of a referential are presented. Moreover, aspects related to the implementation are also presented, with special emphasis on the realization from VLBI data, where only scale information is available.