Abstract Node localization is an essential problem for some engineering applications in wireless sensor network (WSN). In this paper, an improved node localization method is proposed by combining the particle swarm optimization (PSO) and evaluation of environment variables. Firstly, the problem characteristics of node localization in WSN are analysed, and then a framework and a strategy for the settings of important parameters are given... Node localization is an essential problem for some engineering applications in wireless sensor network (WSN). In this paper, an improved node localization method is proposed by combining the particle swarm optimization (PSO) and evaluation of environment variables. Firstly, the problem characteristics of node localization in WSN are analysed, and then a framework and a strategy for the settings of important parameters are given to solve such problems with PSO. Furthermore, the environment variable of WSN is evaluated and an improved node localization method based on PSO is proposed. In the proposed node localization method, the environment variable of WSN is evaluated during the process of ranging and the fitness function of PSO is designed according to the environment variable, and then the PSO algorithm is adopted to solve the node localization problem. Compared with the traditional methods, the results of simulation experiments show that the proposed method has good performance on the core indicators. Besides, for the proposed model and method, we also discussed the impact of several factors on the localization performance, which include the number of nodes, the number of failure nodes, the positioning error and the mean distance-measuring error. Read More Read Less

Abstract Wireless Sensor Networks are prone to two major attacks, viz., the active and passive attacks and these attacks are aimed by five groups as classified in this paper. We in this study have described all the five attacks with a comprehensive architecture. We have detailed all possible defensive mechanisms against these five groups. Our descriptive enumeration as well as the reviews will enable... Wireless Sensor Networks are prone to two major attacks, viz., the active and passive attacks and these attacks are aimed by five groups as classified in this paper. We in this study have described all the five attacks with a comprehensive architecture. We have detailed all possible defensive mechanisms against these five groups. Our descriptive enumeration as well as the reviews will enable the security systems to plan the defensive networks against all attacks. Read More Read Less

Abstract This paper illustrated that the connotation and principle of secuirty based teaching design in the military ideological and political education courses, and discussed its particularity and content, as well as its status and development. Besides, it pointed out that the secured online ideological and political education should meet the requirement of military modern construction. Only with a stronger security based teaching design in... This paper illustrated that the connotation and principle of secuirty based teaching design in the military ideological and political education courses, and discussed its particularity and content, as well as its status and development. Besides, it pointed out that the secured online ideological and political education should meet the requirement of military modern construction. Only with a stronger security based teaching design in the internet security courses, can we achieve a better practical ideological and political education. Read More Read Less

Abstract This paper illustrated that the connotation and principle of secuirty based teaching design in the military ideological and political education courses, and discussed its particularity and content, as well as its status and development. Besides, it pointed out that the secured online ideological and political education should meet the requirement of military modern construction. Only with a stronger security based teaching design in... This paper illustrated that the connotation and principle of secuirty based teaching design in the military ideological and political education courses, and discussed its particularity and content, as well as its status and development. Besides, it pointed out that the secured online ideological and political education should meet the requirement of military modern construction. Only with a stronger security based teaching design in the internet security courses, can we achieve a better practical ideological and political education. Read More Read Less