1,720,984 research outputs found
Studying users’ perception of IoT mobile companion apps
No full textInternet of Things (IoT) products provide over-the-net capabilities such as remote activation, monitoring, and notifications. An associated mobile app is often provided for more convenient usage of these capabilities. The perceived quality of these companion apps can impact the success of the IoT product. We investigate the perceived quality and prominent issues of smart-home IoT mobile companion apps with the aim of deriving insights to: (i) provide guidance to end users interested in adopting IoT products; (ii) inform companion app developers and IoT producers about characteristics frequently criticized by users; (iii) highlight open research directions. We employ a mixed-methods approach, analyzing both quantitative and qualitative data. We assess the perceived quality of companion apps by quantitatively analyzing the star rating and the sentiment of 1,347,799 Android and 48,498 iOS user reviews. We identify the prominent issues that afflict companion apps by performing a qualitative manual analysis of 1,000 sampled reviews. Our analysis shows that users’ judgment has not improved over the years. A variety of functional and non-functional issues persist, such as difficulties in pairing with the device, software flakiness, poor user interfaces, and presence of issues of a socio-technical impact. Our study highlights several aspects of companion apps that require improvement in order to meet user expectations and identifies future directions
Synthesis of context-aware business-to-business processes for location-based services through choreographies
No full textModern technologies and emerging wireless communication solutions in the ICT world are empowering the spread of the most disparate ready-to-use software services distributed over the globe and accessed by an increasing number of users. This state of affairs encourages the development of systems based on the reuse of existing services through composition approaches, notably choreographies. Also Public Administrations are driven towards a digitalization process which exploits composition approaches to build complex and interoperable systems that can be remotely accessed by citizens and authorities. However, an automatic support is needed in order to realize the service composition and the distributed coordination logic that enforces the correct choreography realization. Moreover, the need for building dynamic and user-centered systems calls for the realization of choreographies capable to adjust their behavior to the surrounding context. This work presents our proposal for addressing the choreography realization problem, by describing an automated process for the synthesis of choreography-based systems. The synthesized systems are location-aware and able to adapt the services' interaction according to the user's needs and context conditions. We show and evaluate our approach at work on a real use case scenario in the Public Administration domain
Assessing Dependability for Mobile and Ubiquitous Systems: Is There a Role for Software Architectures?
No full textA traditional research direction in Software Architecture (SA) and dependability is to deduce system dependability properties from the knowledge of the system SA. This well reflects the fact that traditional systems are built by using the closed world assumption. In mobile and ubiquitous systems this line of reasoning becomes too restrictive to apply due to the inherent dynamicity and heterogeneity of the systems under consideration. Indeed, these systems need to relax the closed world assumption and to consider an open world where the system context is not fixed. In other words, the assumption that the system SA is known and \fxed at an early stage of the system development might be a limitation. On the contrary, the ubiquitous scenario promotes the view that systems are built by dynamically assembling available components. System dependability can then at most be assessed in terms of components' assumptions on the system context. This requires the SA to be dynamically induced by taking into consideration the specified dependability and the context conditions. This paper will illustrate this challenge and, by means of an illustrative scenario, will discuss a possible research direction
CHOReVOLUTION: Hands-On In-Service Training for Choreography-Based Systems
No full textCHOReVOLUTION is a platform for the tool-assisted development and execution of scalable applications that leverage the distributed collaboration of services specified through service choreographies. It offers an Integrated Development and Runtime Environment (IDRE) comprising a wizard-aided development environment, a system monitoring console, and a back-end for managing the deployment and execution of the system on the cloud. In this tutorial paper, we describe the platform and demonstrate its step-by-step application to an industrial use case in the domain of Smart Mobility & Tourism. (Demo Video: youtu.be/ae2jI9SYsvg) (GitHub: https://github.com/chorevolution/CHOReVOLUTION-IDRE
Migration of Monoliths through the Synthesis of Microservices using Combinatorial Optimization
No full textMicroservices are an emerging architectural style that is gaining a growing interest from companies and research. They are small, distributed, autonomous and loosely coupled services that are deployed independently and work together by communicating through lightweight protocols.
Microservices are easy to update, scale, deploy, and reduce the time-to-market thanks to continuous delivery and DevOps.
Several existing systems, in contrast, are difficult to maintain, evolve, and scale.
For these reasons, microservices are the ideal candidates for the refactoring and modernization of long-lived monolithic systems. However, the migration process is a complex, time-consuming and error-prone task that needs the support of appropriate tools to assist software designers and programmers from the extraction of a proper architecture to the implementation of the novel microservices.
This paper proposes a possible solution for the automated decomposition of a monolithic system into microservices, which exploits combinatorial optimization techniques to manage the decomposition. Our proposal covers the whole decomposition process, from the microservice architecture definition to the generation of the code of the microservices and their APIs, in order to assist developers and ensure by construction the correct behavior of the refactored system
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Synthesis of Distributed and Adaptable Coordinators to Enable Choreography Evolution
No full textSoftware systems are often built by composing together software services distributed over the Internet. Choreographies are a form of decentralized composition that models the external interaction of the participant services by specifying peer-to-peer message exchanges from a global perspective. Nowadays, very few approaches address the problem of actually realizing choreographies in an automatic way. Most current approaches are rather static and are poorly suited to the need of the Future Internet. In this chapter, we propose a method for the automatic synthesis of evolving choreographies. Coordination software entities are synthesized in order to proxify and control the participant services’ interaction. When interposed among the services, coordination entities enforce the collaboration specified by the choreography. The ability to evolve the coordination logic in a modular way enables choreography evolution in response to possible changes. We illustrate our method at work on a running example in the domain of Intelligent Transportation Systems (ITS)
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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