The Data Activated Liu 1 Graph Engine -DALiuGE 2 -is an execution framework for processing large astronomical datasets at a scale required by the Square Kilometre Array Phase 1 (SKA1). It includes an interface for expressing complex data reduction pipelines consisting of both data sets and algorithmic components and an implementation run-time to execute such pipelines on distributed resources. By mapping the logical view of a pipeline to its physical realisation, DALiuGE separates the concerns of multiple stakeholders, allowing them to collectively optimise large-scale data processing solutions in a coherent manner. The execution in DALiuGE is data-activated, where each individual data item autonomously triggers the processing on itself. Such decentralisation also makes the execution framework very scalable and flexible, supporting pipeline sizes ranging from less than ten tasks running on a laptop to tens of millions of concurrent tasks on the second fastest supercomputer in the world. DALiuGE has been used in production for reducing interferometry data sets from the Karl E. Jansky Very Large Array and the Mingantu Ultrawide Spectral Radioheliograph; and is being developed as the execution framework prototype for the Science Data Processor (SDP) consortium of the Square Kilometre Array (SKA) telescope. This paper presents a technical overview of DALiuGE and discusses case studies from the CHILES and MUSER projects that use DALiuGE to execute production pipelines. In a companion paper, we provide in-depth analysis of DALiuGE's scalability to very large numbers of tasks on two supercomputing facilities.1 Liu is the phonetic form of the Chinese character 流, meaning "flow". 2 Pronounced [da " Ę £lȋW åi] or approximately Da-'Lieu-Gee

This article describes “WAMbot,'' an autonomous unmanned ground vehicle and the Team MAGICian solution to the 2010 Multi Autonomous Ground‐robotic International Challenge (MAGIC). The system architecture, hardware, sensing, planning, navigation, mapping systems, and user interface were specifically designed to address the demands of the large‐scale distributed reconnaissance and surveillance task presented in the challenge. The resulting system was selected as a finalist and ultimately placed 4th in MAGIC 2010. © 2012 Wiley Periodicals, Inc.

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