The effects of the Works Progress Administration's anti-malaria programs in Georgia 1932–1947

From 1900 to 1950, malaria rates declined rapidly in the southeast United States. At its peak, malaria infected over 30% of the population. Malaria declined over the period for several reasons: improvements in public infrastructure; development of new insecticides; improvements in agriculture that promoted drainage; increases in incomes; and changes in migration patterns. This paper focuses on public works constructed by the Works Progress Administration (WPA) during the 1930s and subsequent interventions during the 1940s. To estimate the relationship between these malaria programs and malaria rates, I construct a panel of annual county level malaria rates in Georgia from 1932 to 1947. Between 1932 and 1940 the malaria rate in counties that received WPA malaria projects fell from 25.9 deaths per 100,000 to 5.3 deaths per 100,000. The empirical estimates suggest that WPA malaria projects led to 9.1 fewer deaths per 100,000 or roughly 44% of the observed decline in treated counties. Additional public works constructed by the MCWA during World War II, and the introduction of DDT after 1945 completely eliminated malaria in Georgia by 1947.     

校园网中WLAN的安全问题探讨

无线局域网的应用日趋广泛,但是其存在的安全隐患也不容忽视。该文讨论了目前维护无线局域网安全常用的几种处理方法,指出在校园无线局域网中有必要做的几项安全工作。     

企业无线网络常见的威胁及其应对措施探索

随着网络技术和无线通信技术的不断发展,对无线网络的普及产生了较大的推动作用,对于企业网络信息资源的发掘重组起到了带动作用。然而,由于种种原因使得无线网络存在较大的安全隐患,导致企业的一些重要商业秘密被恶意窃取、篡改,造成了不可估量的损失,其安全缺陷同时又制约了自身的发展。文章针对无线网络安全技术的常见威胁因素进行了分析,并提出了增强网络安全的解决策略。