Extending Alan-DB: Designing a DBMS for storing and retrieving typed, rooted graph-based data on disk

Modeling of a Twisted and Coiled Polymer Muscle

A new type of polymeric artificial muscle was recently discovered. This muscle is based on twisted and coiled polymer fiber and is actuated thermally. It has interesting properties, such as low costs and high work densities. Based on fabrication methods, two variations can be considered. The autocoiled variation has a larger load capacity and...

Parallelizing the Linkage Tree Genetic Algorithm and Searching for the Optimal Replacement for the Linkage Tree

The recently introduced Linkage Tree Genetic Algorithm (LTGA) has shown to exhibit excellent scalability on a variety of optimization problems. LTGA employs Linkage Trees (LTs) to identify and exploit linkage information between problem variables. In this work we present two parallel implementations of LTGA that enable us to leverage the...

Differential Protection Modeling of the Randstad 380 kV South Ring High Voltage Cable in ATP - EMTP

Modern transmission power networks consist mainly of High Voltage overhead lines, since the later have proven their high operational reliability. However, technological developments have made it possible to use High Voltage cables, not only in the distribution grids, but also at higher transmission voltage levels. Thus, more mixed configurations...

Modeling and Extraction of Through-Silicon Vias

3D is entering the world of Integrated Circuits. While interconnects have always been three-dimensional, the actual silicon inside an IC was essentially still planar. The introduction of the Through-Silicon Via changes that, by allowing connections to be made from one side of a die through its silicon substrate to the other side of the die, so...

Visual Instance-Based Modeling of Procedure Specifications for Architectural Structures

Under the pressure of competition and the expectations of consumers, game developers are in a race to create the biggest and most detailed worlds in their productions. Nowadays, thanks to the evolution of computer hardware, great amounts of detail to be put in those worlds, and this trend is not expected to end any time soon. But that detail has...

Sharing Incentives for Lazy Free-Riders in BitTorrent and the BarterCast Reputation System

A well-known problem in peer-to-peer networks is free-riding, where users do not share resources in return for what they consume. Free-riders can be distinguished in two categories: diehard free-riders that are willing to subvert the network’s protocol in order to free-ride, and lazy free-riders that are reluctant to share but do follow the...