117,987 research outputs found
XScan: An Integrated Tool for Understanding Open Source Community-Based Scientific Code
Many scientific communities have adopted community-based models that integrate multiple components to simulate whole system dynamics. The community software projects’ complexity, stems from the integration of multiple individual software components that were developed under different application requirements and various machine architectures, has become a challenge for effective software system understanding and continuous software development. The paper presents an integrated software toolkit called X-ray Software Scanner (in abbreviation, XScan) for a better understanding of large-scale community-based scientific codes. Our software tool provides support to quickly summarize the overall information of scientific codes, including the number of lines of code, programming languages, external library dependencies, as well as architecture-dependent parallel software features. The XScan toolkit also realizes a static software analysis component to collect detailed structural information and provides an interactive visualization and analysis of the functions. We use a large-scale community-based Earth System Model to demonstrate the workflow, functions and visualization of the toolkit. We also discuss the application of advanced graph analytics techniques to assist software modular design and component refactoring
Formal Analysis and Redesign of a Neural Network-Based Aircraft Taxiing System with VerifAI
We demonstrate a unified approach to rigorous design of safety-critical
autonomous systems using the VerifAI toolkit for formal analysis of AI-based
systems. VerifAI provides an integrated toolchain for tasks spanning the design
process, including modeling, falsification, debugging, and ML component
retraining. We evaluate all of these applications in an industrial case study
on an experimental autonomous aircraft taxiing system developed by Boeing,
which uses a neural network to track the centerline of a runway. We define
runway scenarios using the Scenic probabilistic programming language, and use
them to drive tests in the X-Plane flight simulator. We first perform
falsification, automatically finding environment conditions causing the system
to violate its specification by deviating significantly from the centerline (or
even leaving the runway entirely). Next, we use counterexample analysis to
identify distinct failure cases, and confirm their root causes with specialized
testing. Finally, we use the results of falsification and debugging to retrain
the network, eliminating several failure cases and improving the overall
performance of the closed-loop system.Comment: Full version of a CAV 2020 pape
GRAIL – Grid Access and Instrumentation Tool
Since the release of Globus Toolkit 4 Web services enrich the world of Grid Computing. They provide methods to develop modular Grid applications which can be parallelized easily. The access to Web services is mostly solved by complex command line tools which need a good deal of knowledge of the underlaying Grid technologies. GRAIL is intended to fill the gap between existing Grid access methods and both the developer who wants to utilize the Grid for own developments and the user who wants to access the Grid without much additional knowledge. It simplifies the access and the testing of Web services for the Globus Grid middleware. GRAIL provides an easy to use graphical user interface for executing Web services and enables the user to construct complex relationships between services to realize parallel execution. The underlying framework allows an easy integration of any Web service or other arbitrary task without much additional effort for the developer. Existing technologies, shipped with the Globus Toolkit, are seamlessly integrated into GRAIL
Investigation into Mobile Learning Framework in Cloud Computing Platform
Abstract—Cloud computing infrastructure is increasingly
used for distributed applications. Mobile learning
applications deployed in the cloud are a new research
direction. The applications require specific development
approaches for effective and reliable communication. This
paper proposes an interdisciplinary approach for design and
development of mobile applications in the cloud. The
approach includes front service toolkit and backend service
toolkit. The front service toolkit packages data and sends it
to a backend deployed in a cloud computing platform. The
backend service toolkit manages rules and workflow, and
then transmits required results to the front service toolkit.
To further show feasibility of the approach, the paper
introduces a case study and shows its performance
Software (Re-)Engineering with PSF III: an IDE for PSF
We describe the design of an integrated development environment (IDE) for
PSF. In the software engineering process we used process algebra in the form of
PSF for the specification of the architecture of the IDE. This specification is
refined to a PSF specification of the IDE system as a ToolBus application, by
applying vertical and horizontal implementation techniques. We implemented the
various tools as specified and connected them with a ToolBus script extracted
from the system specification
Graph-RAT: Combining data sources in music recommendation systems
The complexity of music recommendation systems has increased rapidly in recent years, drawing upon different sources of information: content analysis, web-mining, social tagging, etc. Unfortunately, the tools to scientifically evaluate such integrated systems are not readily available; nor are the base algorithms available. This article describes Graph-RAT (Graph-based Relational Analysis Toolkit), an open source toolkit that provides a framework for developing and evaluating novel hybrid systems. While this toolkit is designed for music recommendation, it has applications outside its discipline as well. An experiment—indicative of the sort of procedure that can be configured using the toolkit—is provided to illustrate its usefulness
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