Online state migration in modern stream processing engines

Stream Processing Engines (SPEs) are called upon to help solve problems around big and volatile data, while satisfying the needs for near real-time processing. In order for such systems to be considered effective solutions to such problems at scale, efficient elasticity and non dataflow-disturbing reconfiguration operations within are a...

Reconfiguration of Graph Colorings

For this thesis, we consider two $k$-colorings of a graph $G$ adjacent if one can recolor one into the other by changing the color of one vertex. The reconfiguration graph of a graph $G$ on $k$ colors $\mathcal{C}_{k}(G)$ is the graph for which the vertices are the $k$-colorings of $G$, and an edge is between two $k$-colorings if they are...

Design and Implementation of a Reconfigurable Phase Shift Full-Bridge Converter for Wide Voltage Range EV Charging Application

This article analyzes, designs, and tests a reconfigurable phase shift full-bridge (r-PSFB) isolated dc/dc converter well suited for a wide voltage operating range. By controlling the auxiliary switches, a series or parallel connection can be realized on the secondary side of the converter. As a result, the r-PSFB converter can operate in an...

Captain and conscript or companions in operational reconfiguration? The case of an infrastructure owner with projects and asset management units

Infrastructure owners with projects and asset management units reconfigure their operational capabilities to deal with external stressors. We distinguish between two reconfiguration approaches, the discrete and the continuous approach. The discrete approach is broadly adopted in the infrastructure sector and draws from the project...

Vessel-Platform Automation: Integrating self-assembly with configuration dependent control strategies

Vessel platform automation developed notably categorizable in two behaviors: reconfiguration and collaborative motion control. This work explores integration of both behaviors in a single system. Fundamental system characteristics of both behaviors are analyzed to create understanding of the varying design approaches. A multi-vessel platform...

Architectures in Motion: Reconfiguring Addis Ababa's Narratives

Ethiopia is both one of the fastest-growing economies and one of the poorest countries in the world. As its population grows exorbitantly, waves of migrants are flowing endlessly into the capital city. Such a fast pace of development brings about a hallucinated future constituted by processes driven by economic and political forces pursuing...

Restructuring medium voltage distribution grids: Parallel AC-DC reconfigurable links

Energy transition will inevitably lead to greater electrification. For example, it is anticipated that electrical energy demand will rise by at least 2-3 times by 2050 with increasing share of electric vehicles and heat pumps. This will translate to significant increase in power demand on the existing medium voltage distribution grid, resulting...

Boundaries of Operation for Refurbished Parallel AC–DC Reconfigurable Links in Distribution Grids

Hybrid ac–dc reconfigurable link technology can find interesting applications in medium-voltage power distribution. These are networks having dc links operating in parallel alongside ac links with post-fault reconfiguration capability. A given system can operate in different configurations while maintaining equivalent capacity during (n−1)...

Offline Reconfigurability Based Substation Converter Sizing for Hybrid AC-DC Distribution Links

Hybrid ac-dc distribution systems with multiple parallel operating ac and dc links are being developed to maximize system capacity during (n-1) contingencies. This paper shows that offline reconfigurability between such ac and dc links post-fault clearance allows an additional design flexibility of reducing the required substation converter...

AC Distribution Grid Reconfiguration using Flexible DC Link Architecture for Increasing Power Delivery Capacity during (n-1) Contingency

A practical issue faced by today's ac grid is the rapidly growing power demand on its aging infrastructure. One possibility to maximize the capacity of the existing infrastructure is to refurbish the ac links to operate under dc conditions using modular multilevel converters. In this paper, the idea is applied to restructure an actual medium...

Reconfigurable DC Links for Restructuring Existing Medium Voltage AC Distribution Grids

While the scientific community recognizes the benefits of DC power transfer, the distribution network operators point out the practical and economic constraints in refurbishing the existing AC network at a medium-voltage level. Some apprehensions like reliability, cost of ownership, and safety in adopting a universal DC distribution may merit...

Run-time Reconfiguration in Wireless Sensor Networks

A wireless sensor network (WSN) consists of multiple small and simple computers (nodes), whose performance is tightly linked to its unpredictable deployment environment. It is nearly impossible to design a WSN that performs well in every scenario; instead they are developed for a specific context, with performance rapidly decreasing when...

Efficient Runtime Management of Reconfigurable Hardware Resources

Runtime reconfigurable systems built upon devices with partial reconfiguration can provide reduction in overall hardware area, power efficiency, and economic cost in addition to the performance improvements due to better customization. However, the users of such systems have to be able to afford some additional costs compared to hardwired...

Run-Time Partial Reconfiguration on the Virtex-II Pro

Reconfigurable Computing entails the utilization of a general-purpose processor augmented with a reconfigurable hardware structure (e.g. a field-programmable gate array). Normally, a complete reconfiguration is needed to cha nge the functionality of the FPGA even when the change is only minor. Moreover, the complete chip needs to be halted to...