Abstract. The evolution of various wireless technologies has greatly increased the interest in heterogeneous networks, in which the mobile users can enjoy services while roaming between different networks. The current Internet architecture does not seem to cope with the modern networking trends and the growing application demands for performance, stability and efficiency, as the integration of different technologies faces many problems. In this paper, we focus on the issues raised when attempting to provide seamless mobility over a hybrid environment. We highlight the shortcomings of the current architecture, discuss some of the proposed solutions and try to identify the key choices that lead to failure. Finally, we introduce RINA (Recursive Inter-Network Architecture), a newly-proposed network architecture that achieves to integrate networks of different characteristics inherently and show a simple example that demonstrates this feature.

Abstract-Microalgae have the potential to produce enough biofuels to meet the current US fuel demands. In order to achieve this potential, photobioreactors (PBRs) need to be developed that are efficient, scalable, and affordable. Models are an analytical tool that can be used to evaluate various PBRs. In this article, a dynamic model is developed for growing microalgae in a vertical flat panel photobioreactor (PBR) that may be used to measure PBR efficiency for various architectures independent of scale. The growth model is used to estimate the microalgae growth and byproduct production and consumption as a function of incident light. A feed-forward controller is developed that uses the estimated amount of CO2 consumed to determine the amount of additional CO2 to add to the system during photosynthesis. An overall controller structure that uses both feed-forward and feedback control is presented for growing microalgae inside a PBR.

Abstract-In the course of generalizing the Inter-Process Communication (IPC) model from one system, two, to N systems directly connected, the necessity of a function to figure out via which "wire" or interface the requested application is available became apparent. In a Recursive InterNetwork Architectureenabled system this is equivalent to asking on which of the Distributed IPC Facilities (layers) the requested application is available. We name this distributed application, the Inter-DIF Directory (IDD). In this paper we explain why the IDD is fundamental in networks, allowing the discovery of applications that belong to layers other than the one the requested application is on. Moreover, there are two phases of the IDD function: first, finding the requested application and then, creating a DIF that supports the communication. We describe the actions taken in each phase. Finally, we give a simple example of an IDD that makes use of hierarchical names.

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