Evaluating the Quality of Free/Open Source Systems: A Case Study

2011 ◽  
pp. 119-134 ◽  
Author(s):  
Lerina Aversano ◽  
Maria Tortorella
Keyword(s):  
Open Source ◽  
Open Source Systems ◽  
Free Open Source

An open-source R-package and web application for high-quality probabilistic predictions in hydrology

2021 ◽  
Author(s):  
Jason Hunter ◽  
Mark Thyer ◽  
Dmitri Kavetski ◽  
David McInerney
Keyword(s):  
Open Source ◽  
Web Application ◽  
R Package ◽  
Error Model ◽  
Objective Functions ◽  
High Quality ◽  
Wide Range ◽  
Probabilistic Error

<p>Probabilistic predictions provide crucial information regarding the uncertainty of hydrological predictions, which are a key input for risk-based decision-making. However, they are often excluded from hydrological modelling applications because suitable probabilistic error models can be both challenging to construct and interpret, and the quality of results are often reliant on the objective function used to calibrate the hydrological model.</p><p>We present an open-source R-package and an online web application that achieves the following two aims. Firstly, these resources are easy-to-use and accessible, so that users need not have specialised knowledge in probabilistic modelling to apply them. Secondly, the probabilistic error model that we describe provides high-quality probabilistic predictions for a wide range of commonly-used hydrological objective functions, which it is only able to do by including a new innovation that resolves a long-standing issue relating to model assumptions that previously prevented this broad application.  </p><p>We demonstrate our methods by comparing our new probabilistic error model with an existing reference error model in an empirical case study that uses 54 perennial Australian catchments, the hydrological model GR4J, 8 common objective functions and 4 performance metrics (reliability, precision, volumetric bias and errors in the flow duration curve). The existing reference error model introduces additional flow dependencies into the residual error structure when it is used with most of the study objective functions, which in turn leads to poor-quality probabilistic predictions. In contrast, the new probabilistic error model achieves high-quality probabilistic predictions for all objective functions used in this case study.</p><p>The new probabilistic error model and the open-source software and web application aims to facilitate the adoption of probabilistic predictions in the hydrological modelling community, and to improve the quality of predictions and decisions that are made using those predictions. In particular, our methods can be used to achieve high-quality probabilistic predictions from hydrological models that are calibrated with a wide range of common objective functions.</p>

scholarly journals SENTIMENT ANALYSIS OF FREE/OPEN SOURCE DEVELOPERS: PRELIMINARY FINDINGS FROM A CASE STUDY

2014 ◽  
Vol 13 (2) ◽  
Author(s):  
Athanasios-Ilias Rousinopoulos ◽  
Gregorio Robles ◽  
Jesús M. González-Barahona
Keyword(s):  
Sentiment Analysis ◽  
Open Source ◽  
Open Source Software ◽  
Free Open Source Software ◽  
Free Open Source

O desenvolvimento de software é uma atividade intensive em esforço humano. Assim, a forma como os desenvolvedores encaram suas tarefas é de suam importância. Em um ambiente como o usual em projetos de FOSS (free/open source software) em que profissionais (desenvolvedores pagos) compartilham os esforços de desenvolvimento com voluntários, a moral da comunidade de desenvolvedores e usuários é fundamental. Neste artigo, apresentamos uma análise preliminary utilizando técnicas de análise de sentimentos realizada em um projeto de FOSS. Para isso, executamos a mineração da lista de endereços eletrônicos de um projeto e aplicamos as técnicas propostas aos participantes mais relevantes. Embora a aplicação seja limitada, no momento atual, experamos que essa experiência possa ser benéfica no future para determiner situações que possam afetar os desenvolvedores ou o projeto, tais como baixa produtividade, abandono do projeto ou bifurcação do projeto, entre outras.

scholarly journals Own system of intelligent building in comparison with an open - source solution

2019 ◽  
Vol 12 ◽  
pp. 232-239
Author(s):  
Cezary Kryczka
Keyword(s):  
Comparative Analysis ◽  
Open Source ◽  
Automation System ◽  
Home Automation ◽  
Intelligent Building ◽  
Building System ◽  
Home Automation System ◽  
Open Source Systems ◽  
Free Open Source

This article is an attempt to answer the question whether and under what conditions it is beneficial to develop an own intelligent building system, when many free open source systems are available. The publication presents the characteristics of author's own home automation system - sHome, as well as the open-source system - Domoticz, in a configuration that is as close to the functionality of the author's system as possible. The work ends with a comparative analysis of the systems and conclusions from the analysis.

Design and Managing of Distributed Virtual Organizations

2011 ◽  
pp. 463-468
Author(s):  
Diego Liberati
Keyword(s):  
Web Services ◽  
Open Source ◽  
Virtual Organizations ◽  
Organizational Dynamics ◽  
Service Invocation ◽  
Cooperative Enterprise ◽  
Open Source Systems ◽  
Public Environment

A framework is proposed that creates, uses, communicates, and distributes information whose organizational dynamics allow it to perform a distributed cooperative enterprise in public environments even over open source systems. The approach assumes Web services as the enacting paradigm, possibly over a grid, to formalize interaction as cooperative services on various computational nodes of a network. A framework is thus proposed that defines the responsibility of e-nodes in offering services and the set of rules under which each service can be accessed by e-nodes through service invocation. By discussing a case study, the chapter will detail how specific classes of interactions can be mapped into a serviceoriented model whose implementation will be carried out in a prototypical public environment.

Design and Managing of Distributed Virtual Organizations

2011 ◽  
pp. 564-569
Author(s):  
Diego Liberati
Keyword(s):  
Web Services ◽  
Open Source ◽  
Virtual Organizations ◽  
Organizational Dynamics ◽  
Service Invocation ◽  
Cooperative Enterprise ◽  
Open Source Systems ◽  
Public Environment

A framework is proposed that creates, uses, communicates, and distributes information whose organizational dynamics allow it to perform a distributed cooperative enterprise in public environments even over open source systems. The approach assumes Web services as the enacting paradigm, possibly over a grid, to formalize interaction as cooperative services on various computational nodes of a network. A framework is thus proposed that defines the responsibility of e-nodes in offering services and the set of rules under which each service can be accessed by e-nodes through service invocation. By discussing a case study, the chapter will detail how specific classes of interactions can be mapped into a serviceoriented model whose implementation will be carried out in a prototypical public environment.

Volunteers in Large Libre Software Projects

2007 ◽  
pp. 1-24 ◽  
Author(s):  
Martin Michlmayr ◽  
Gregorio Robles ◽  
Jesus M. Gonzalez-Barahona
Keyword(s):  
Human Resources ◽  
Open Source ◽  
Technical Skills ◽  
Voluntary Work ◽  
Software Projects ◽  
Free Open Source Software ◽  
Libre Software ◽  
Free Open Source ◽  
Over Time

Most libre (free, open source) software projects rely on the work of volunteers. Therefore, attracting people who contribute their time and technical skills is of paramount importance, both in technical and economic terms. This reliance on volunteers leads to some fundamental management challenges: Volunteer contributions are inherently difficult to predict, plan, and manage, especially in the case of large projects. In this chapter we present an analysis of the evolution over time of the human resources in large libre software projects, using the Debian project, one of the largest and most complex libre software projects based mainly in voluntary work, as a case study. We have performed a quantitative investigation of data corresponding to roughly seven years, studying how volunteer involvement has affected the software released by the project, and the developer community itself.

A Framework for Semantic Grid in E-Science

2009 ◽  
pp. 235-240
Author(s):  
Diego Liberati
Keyword(s):  
Web Services ◽  
Open Source ◽  
Organizational Dynamics ◽  
Semantic Grid ◽  
Collaborative Environment ◽  
Cooperative Enterprise ◽  
Open Source Systems ◽  
The Web ◽  
Generally True

A framework is proposed that creates, uses, and communicates information, whose organizational dynamics allows performing a distributed cooperative enterprise in public environments, even over open source systems. The approach assumes the web services as the enacting paradigm possibly over a grid, to formalize interactions as cooperative services on various computational nodes of a network. The illustrated case study shows that some portions, both of processes and of data or knowledge, can be shared in a collaborative environment, which is also more generally true for any kind of either complex or resource demanding (or both) interaction that will benefit any of the approaches.

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