* This project is funded under the NASA-KSC STTR-Phase I Program. ABSTRACT A single-stage power factor correction converter with softswitching is proposed in this paper. The topology of this converter is derived by adding a resonant circuit to an existing Single-Stage, Single-Switch Power Factor Correction (S PFC) converter. As a result, zero-voltage-switching and zero-current-switching are ach...

For tutorial dialogue systems, selecting an appropriate dialogue move to support learners can significantly influence cognitive and affective outcomes. The strategies implemented in tutorial dialogue systems have historically been based on handcrafted rules derived from observing human tutors, but a data-driven model of strategy selection may increase the effectiveness of tutorial dialogue syst...

Clustering algorithms can identify groups in large data sets, such as star catalogs and hyperspectral images. In general, clustering methods cannot analyze items that have missing data values. Common solutions either fill in the missing values (imputation) or ignore the missing data (marginalization). Imputed values are treated as just as reliable as the truly observed data, but they are only a...

In this paper, we propose a new classification technique based on the Minimum Component Analysis (MCA) instead of the traditional Principal Components Analysis (PCA). Most existing classification techniques based on PCA represent a class by its principal component. However, the principal component is not always the best choice since there is a high possibility for classes to overlap with each o...

The objective of this research is development of an Advanced Life Support Automated Robotic Manipulator –End Effector (ALSARM-EE); a robotic system to be used in the Biomass production chamber (BPC) at Kennedy space center (KSC). The ALSARM-EE is composed of a seven degree-of-freedom robot system that has an automated control. It provides automated and manual data measurement capabilities while...

The rapid development of computer and information technology has made project evaluation and selection a difficult task at the Kennedy Space Center (KSC) Shuttle Project Engineering Office. Decision Makers (DMs) are required to consider a vast amount of intuitive and analytical information in the decision process. Fuzzy Euclid is a Multi-criteria Decision Analysis (MCDA) model that captures the...

Artificial Intelligence (AI) technology, and in particular expert systems — a subset of AI which shows the strongest applicability to a wide variety of environments, has recently emerged from the realm of basic research into that of real-world applications. To further these advances, NASA-Kennedy Space Center (KSC) provided funding and other critical resources to the University of Central Flori...