Is direct seeded rice a boon for economic performance? Empirical evidence from India

The direct-seeded rice (DSR) establishment method can improve productivity and labor efficiency while taking into account the soil and hydrologic conditions of the field, the availability of appropriate land equipment, and irrigation-drainage systems. Using plot- and household-level data, we analyze the impacts of DSR adoption in two rice-growing states of India. We account for observed and unobserved heterogeneity using endogenous switching regression. We analyze the yield and costs effects of DSR adoption. Our study shows a small but significant effect of DSR adoption on yield and costs. We find increase in rice yields (by 3.74%) for DSR adopters; an increase in rice yields (by 6.79%) if the DSR method were adopted on puddled transplant rice (PTR) parcels. We find a 7.51% reduction in total costs for DSR adopters; a decrease in total costs (by 3.71%) if the DSR method was adopted on PTR parcels. DSR farmers can significantly reduce their fertilizer and land preparation costs. Hence, the decision to adopt DSR may help households with limited resources to reduce their cost of production without compromising the yield.     

Ad Hoc网络中DSR协议的QoS改进算法

针对AdHoc网络中基于资源预留的QoS算法所带来的复杂度问题,本文引入了适合该网络的测量可用带宽算法,并且提出了新的DSR-QoS改进算法。仿真结果表明,在网络业务较大的时候这种改进是有效的,适合实时业务的传输;在网络业务较小的时候,这种改进的效果不是很明显。     

移动Ad hoc网络路由协议的ns模拟分析

Ad hoc网络是一种自组网,移动节点必须具备路由功能,那么路由协议选择至关重要。文章介绍了DSDV、DSR和AODV几种典型的路由协议。然后采用NS模拟的方法,得到了吞吐量、丢包率和端到端的延时性能分析图。通过对模拟结果的分析比较,给出这几种路由协议的优缺点及未来路由协议的发展方向。     

Security Routing Protocol For The Wireless Mesh Networks (WMNs)

The pretty promising Wireless Mesh Networking technique, which is regarded as the next generation wireless Internet, not only possesses the normal features of wireless networks, but also has the advantages of multi-hop, self-organizing, etc. However, the great strength of the Mesh Networks also lead to a serious problem in the perspective of network security. This paper starts with the security issue of WMN routing and puts forward the corresponding solutions to the two kinds of routings’ security, such as adding the public/private (Pi/Si) key to the AODV to solve the problem of black hole and adding the credit value of nodes to the DSR to improve the security.