This thesis deals with the use of sound in interactions in the context of participatory systems and data sonification. We investigate an interactive environment where participants perceive... Show moreThis thesis deals with the use of sound in interactions in the context of participatory systems and data sonification. We investigate an interactive environment where participants perceive information of the data through sound elements. To define the interactive process, we employ the dialogue model, breaking it down into three components: subject, verbal, and adjective. This supports the purpose of having a better understanding of the topics addressed in this thesis: i.e., interaction models, data sonification, interaction & design, and evaluation of data sonification. Moreover, it contributes new findings and perspectives to these topics. Show less
We have designed an interactive form of sonification in which the listener navigates through the molecular structures of amino acids over the network of carbon atoms. We use pitch and density as... Show moreWe have designed an interactive form of sonification in which the listener navigates through the molecular structures of amino acids over the network of carbon atoms. We use pitch and density as the two main features for the sound design of the four common chemical elements (H, C, N, O). We use multiple concurrently sounding sources to spatially sonify the atoms around a certain carbon atom of the amino acids. The main goal of this paper is to evaluate this sonification approach. We cover the design, execution and evaluation of two separate cycles of experiments that aim to evaluate our sonification approach and get insight in factors that may influence the individual performance of the concurrently sounding source identification and localization. Show less
We are interested in sonifying the molecular structures of amino acids. This paper describes the context and the first design choices for our approach. So far, we believe an amino acid molecule is... Show moreWe are interested in sonifying the molecular structures of amino acids. This paper describes the context and the first design choices for our approach. So far, we believe an amino acid molecule is too complex to be perceived at once. Therefore, we have designed an interactive form of sonification in which the listener navigates through the molecule over the network of carbon atoms. We describe our different approaches and discuss the topic of immediacy: the time it takes to recognize the structure surrounding the listenerﾒs position while navigating. Furthermore, we touch upon the question how many atoms we can sonify simultaneously and the role auditory masking plays in this context. To overcome auditory masking, we propose to use irregular but easy to recognize sounds. We conclude with an interest in a three-dimensional navigation environment using general molecular structures for further research and development. Show less
In this paper, we study the scheduling problem of the imprecise mixed-criticality model (IMC) under earliest deadline first with virtual deadline (EDF-VD) scheduling upon uniprocessor systems. Two... Show moreIn this paper, we study the scheduling problem of the imprecise mixed-criticality model (IMC) under earliest deadline first with virtual deadline (EDF-VD) scheduling upon uniprocessor systems. Two schedulability tests are presented. The first test is a concise utilization-based test which can be applied to the implicit deadline IMC task set. The suboptimality of the proposed utilization-based test is evaluated via a widely-used scheduling metric, speedup factors. The second test is a more effective test but with higher complexity which is based on the concept of demand bound function (DBF). The proposed DBF-based test is more generic and can apply to constrained deadline IMC task set. Moreover, in order to address the high time cost of the existing deadline tuning algorithm, we propose a novel algorithm which significantly improve the efficiency of the deadline tuning procedure. Experimental results show the effectiveness of our proposed schedulability tests, confirm the theoretical suboptimality results with respect to speedup factor, and demonstrate the efficiency of our proposed algorithm over the existing deadline tunning algorithm. In addition, issues related to the implementation of the IMC model under EDF-VD are discussed. Show less
Zhang, Z.; Ivison, R.J.; George, R.D.; Zhao, Y.; Dunne, L.; Herrera-Camus, R.; ... ; Werf, P.P. van der 2018
Systems are called real-time systems, if the correctness of the system does not only depend on the correctness of the system output but also on whether the output is delivered on time. Some... Show moreSystems are called real-time systems, if the correctness of the system does not only depend on the correctness of the system output but also on whether the output is delivered on time. Some examples of real-time systems are medical systems, automotive, aircrafts, etc. With the advent of Internet of Things (IoTs) and Cyber-Physical Systems (CPS), real-time systems and the systems that desire to apply real-time discipline are becoming ubiquitous. The increasing complexity of real-time software and the emerging new hardware inspire us to revisit the ``old-wise'' in the embedded system community and the real-time community and to propose novel solutions dealing with the drastic changes in real-time systems. Therefore, in this dissertation, we propose the new techniques and algorithms to improve the performance of real-time systems in terms of latency, energy, and schedulability. Show less
