Self-organizing nest migration dynamics synthesis for ant colony systems

In this study, we synthesize a novel dynamical approach for ant colonies enabling them to migrate to new nest sites in a self-organizing fashion. In other words, we realize ant colony migration as a self-organizing phenotype-level collective behavior. For this purpose, we first segment the edges of the graph of ants' pathways. Then, each segment, attributed to its own pheromone profile, may host an ant. So, multiple ants may occupy an edge at the same time. Thanks to this segment-wise edge formulation, ants have more selection options in the course of their pathway determination, thereby increasing the diversity of their colony's emergent behaviors. In light of the continuous pheromone dynamics of segments, each edge owns a spatio-temporal piece-wise continuous pheromone profile in which both deposit and evaporation processes are unified. The passive dynamics of the proposed migration mechanism is sufficiently rich so that an ant colony can migrate to the vicinity of a new nest site in a self-organizing manner without any external supervision. In particular, we perform extensive simulations to test our migration dynamics applied to a colony including 500 ants traversing a pathway graph comprising 200 nodes and 4000 edges which are segmented based on various resolutions. The obtained results exhibit the effectiveness of our strategy

A decision support system for managing results-based financed mega infrastructure programs

International Financial Institutions are exploring solutions that can ensure the effectiveness of funds with respect to the achievement of desired results/outputs. Results-Based finance (RBF) considers this goal through linking desired outputs to the disbursement of funds. This may require borrowers to pre-finance programs and then receive their allocated disbursements after results are achieved, which could form cash flow gaps. The management of this type of programs requires the integration of multiple projects management and finance-based scheduling with the financial requirements of results-based funding mechanisms. For proper management of received funds, this research introduces a framework for the simulation and optimization of RBF funded programs, that serves as a Decision Support System (DSS) for borrowers while implementing RBF. The Program-For-Results (P4R) mechanism, offered by the World Bank (WB), was used as one of the RBF mechanisms for verifying the developed framework. A model was developed for guiding borrowing governments through the full processes of P4R. The proposed model provides governments a step-by-step guide through each stage from initiation to program closing. For verification, the model was applied on a case study for presenting its capabilities. It was validated using the Sustainable Rural Sanitation Services Program (SRSSP) in Egypt, and it showed an improvement in the overall financial standing of the government. This model was developed and applied on the P4R mechanism; however, it applies to any other RBF mechanism as they share the same concepts and mechanisms

Technology and Management Applied in Construction Engineering Projects

This book focuses on fundamental and applied research on construction project management. It presents research papers and practice-oriented papers. The execution of construction projects is specific and particularly difficult because each implementation is a unique, complex, and dynamic process that consists of several or more subprocesses that are related to each other, in which various aspects of the investment process participate. Therefore, there is still a vital need to study, research, and conclude the engineering technology and management applied in construction projects. This book present unanimous research approach is a result of many years of studies, conducted by 35 well experienced authors. The common subject of research concerns the development of methods and tools for modeling multi-criteria processes in construction engineering