Implementation and user testing of a system for visualizing continuous health data and events

Information Visualization

Pirozzi

et al. 2016

Experienced musicians have the ability to understand the structural elements of music compositions. Such an ability is built over time through the study of music theory, the understanding of rules that guide the composition of music, and countless hours of practice. The learning process is hard, especially for classical music, where the rigidity of the music structures and styles requires great effort to understand, assimilate, and then master the learned notions. In particular, we focused our attention on a specific type of music compositions, namely, music in chorale style (four-voice music). Composing such type of music is often perceived as a difficult task because of the rules the composer has to adhere to. In this article, we propose a visualization technique that can help people lacking a strong knowledge of music theory. The technique exploits graphic elements to draw the attention on the possible errors in the composition. We then developed an interactive system, named VisualMelody, that employs the proposed visualization technique to facilitate the understanding of the structure of music compositions. The aim is to allow people to make four-voice music composition in a quick and effective way, that is, avoiding errors, as dictated by classical music theory rules. We have involved 40 people in testing VisualMelody in order to analyze its effectiveness, its usability, and the overall user satisfaction. We partitioned the people involved in the evaluation study into two groups evenly splitting the musical expertise. Then, we had one group use VisualMelody without the visualization facilities and the other using the tool enhanced with our visualization. On average, people in the group that used our visualization were 60% faster and produced music with less errors.

“…In our evaluation study, we followed the standard human–computer interaction (HCI) methodology, 19 commonly applied in different contexts, 20,21 as well as visualization. 22–24…”

Section: Discussionmentioning

confidence: 99%

Understanding the structure of musical compositions: Is visualization an effective approach?

Prisco

Information Visualization

Pirozzi

et al. 2016

“…In our evaluation study, we followed the standard human–computer interaction (HCI) methodology, 26 commonly applied in different contexts, 27,28 as well as visualization. 29–31…”

Section: Discussionmentioning

confidence: 99%

The legal macroscope: Experimenting with visual legal analytics

Lettieri

Altamura

Information Visualization

2016

This work presents Knowlex, a web application designed for visualization, exploration, and analysis of legal documents coming from different sources. Understanding the legal framework relating to a given issue often requires the analysis of complex legal corpora. When a legal professional or a citizen tries to understand how a given phenomenon is disciplined, his attention cannot be limited to a single source of law but has to be directed on the bigger picture resulting from all the legal sources related to the theme under investigation. Knowlex exploits data visualization to support this activity by means of interactive maps making sense out of heterogeneous documents (norms, case law, legal literature, etc.). Starting from a legislative measure (what we define as Root) given as input by the user, the application implements two visual analytics functionalities aiming to offer new insights on the legal corpus under investigation. The first one is an interactive node graph depicting relations and properties of the documents. The second one is a zoomable treemap showing the topics, the evolution, and the dimension of the legal literature settled over the years around the norm of interest. The article gives an overview of the research so far conducted presenting the results of a preliminary evaluation study aiming at evaluating the effectiveness of visualization in supporting legal activities as well as the effectiveness of Knowlex, the usability of the proposed system, and the overall user satisfaction when interacting with its applications.

“…In our evaluation study, we followed the standard humancomputer interaction methodology (Lazar, Feng, & Hochheiser, 2010) that is commonly applied in various contexts (Al-Musawi, Ledesma, Nieminen, & Korhonen, 2016;Blake, Stapleton, Rodgers, & Howse, 2014;De Prisco et al, 2016a;De Prisco, Malandrino, Pirozzi, Zaccagnino, & Zaccagnino, 2017;Leon et al, 2012;Malandrino et al, 2015). Specifically, given the configurations described in Section 4, we wanted to answer the following questions: Virtual Reality Configuration VRConf…”

Section: Evaluation Studymentioning

confidence: 99%

Virtual Reality Interfaces for Interacting with Three-Dimensional Graphs

Erra

International Journal of Human–Computer Interaction

Pepe

2018

Today, virtual reality (VR) systems are widely available through low-cost devices such as Oculus Rift and HTC Vive. Although VR technology has so far been centered on entertainment, there is a growing interest from developers, technology companies, and consumers to evaluate it in a wider variety of contexts. This paper explores the effectiveness of visualizing and interacting with three-dimensional graphs in VR in comparison with the traditional approach. In particular, we present an empirical evaluation study for exploring and interacting with three-dimensional graphs using Oculus Rift and Leap Motion. We designed several interfaces exploiting the natural user interface in a VR environment and compared them with traditional mouse-keyboard and joypad configurations. Our evaluation suggests that, although these upcoming VR technologies are more challenging than more traditional ones, they facilitate user involvement during graph interaction and visualization tasks, given the enjoyable experience elicited when combining gesture-based interfaces and VR.