The aim of this special issue is to explore organizing processes in ways which do not assume an a priori existence of space and time. Rather than providing a summary of the papers collected here, this introduction illustrates how Spacing and Timing relate to issues of knowing, organizing, mediation, engagement, alterity and absence/presence. We examine how various actions and practices may be seen as seeking to achieve order but also concomitantly create further openings and orderings. Finally, while this introduction attempts to highlight a range of issues relating to this process, the development of alternative vocabularies, approaches, and insights are required to develop this work further.

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Abstract: Wireless sensor networks (WSNs) are at risk to cyber attacks and thus security is of vital concern. WSN is a soft target for worm attacks due to fragile defence mechanism in the network . A single unsecured node can essentially propogate the worm in the complete network via communication. Mathematical epidemic models are useful in the study of propagation of worms in WSNs. This work considers a fractional order discrete model of attacking and spreading dynamics of worms in WSNs of the form The proposed epidemic model is probed with the assistance of stability theory. Basic reproduction number (R 0 )is determined for the analysis of the dynamics of worm propagation in WSNs. The equilibrium states are computed and analyzed the stability. Basic reproduction number R 0 enables to discover the threshold values for communication radius and node density distribution. If reproduction number is less than one, the worm free equilibrium state (WFE) is locally asymptotically stable (LAS) and if reproduction number is more than one then the endemic equilibrium state (EE) is asymptotically stable. Numerical illustrations affirm the consistency of the theoretical analysis and stimulating dynamical behavior of the system is observed.