The 'physics of diagrams' : revealing the scientific basis of graphical representation design

Data is omnipresent in the modern, digital world and a significant number of people need to make sense of data as part of their everyday social and professional life. Therefore, together with the rise of data, the design of graphical representations has gained importance and attention. Yet, although a large body of procedural knowledge about effective visualization exists, the quality of representations is often reported to be poor, proposedly because these guidelines are scattered, unstructured and sometimes perceived as contradictive. Therefore, this paper describes a literature research addressing these problems. The research resulted in the collection and structuring of 81 guidelines and 34 underlying propositions, as well as in the derivation of 7 foundational principles about graphical representation design, called the "Physics of Diagrams", which are illustrated with concrete, practical examples throughout the paper

Semantic Change: Synaesthetic Metaphors

Every word has its own history. Semantic change does not follow strict rules as other domains, such as phonological change sometimes does, but it does not happen randomly either. In this paper we will analyze a phenomenon which could represent a law in semantic change, and at the same time help explaining how our cognitive system processes Language, synaesthetic metaphor (SM), a kind of metaphor in which the two terms belong to different sensorial domains, as in 'sweet smell'. Words change in order to fulfil a need; they change to ease communication and to help conceptualizing the changing world. Scholars have struggled to find a law for semantic change for several years but up to now they have not found any firm pattern. The evolution of a word cannot be foreseen, but there are some natural tendencies that new lexicalizations tend to follow. For instance, abstract concepts, which are difficult to grasp, are usually understood in terms of concrete ones, which can be understood more easily, so, words for the latter are used for referring to the former. In the case of SM, however, we can find more than a simple tendency; we have a regularity that is almost an exceptionless law: the directionality thesis. The directionality thesis analyses the order of mapping in the synaesthetic transfer. Several authors have analysed verbal synaesthesia from different perspectives and conclude that the mapping goes from the lower to the higher senses. The directionality thesis mirrors a natural tendency: transfer of meaning usually goes from concrete to abstract. On the other hand, we will see that metaphor and especially SM cannot be accounted within the boundaries of semantics, pragmatics or any linguistic theory. We need a cognitive approach such as the conceptual metaphor theory. The conceptual metaphor theory defends that metaphors, and SM, can be processed because our cognitive system is metaphorical in nature and we are prepared to understand one thing in terms of another. In this approach, metaphor is not considered the exception of a rule anymore, it is seen as the norm. Moreover, another kind of synaesthesia, the perceptual or strong synaesthesia, provides evidence to show how our cognitive system works. The fact that some people, synaesthetes, experience real co-sensation, makes us believe that our cognitive system works in an analogical manner. Synaesthesia provides linguists with a path to analyse the functioning of Language

Survey of Educational Modelling Languages (EMLs)

CEN/ISSS WS/LT Learning Technologies WorkshopThe reports compares several approaches to educational modelling. The work has been performed under the umbrella of the CEN/ISSS, the European workshop for learning technologies. (http://dspace.ou.nl/bitstream/1820/227/2/eml-report-cen-isss.pdf

Tools for Stored Interactive Multimedia

Thesis submitted for the PhD degree

Understanding Declare Models: Strategies, Pitfalls, Empirical Results

Declarative approaches to business process modeling are regarded as well suited for highly volatile environments, as they enable a high degree of flexibility. However, problems in understanding and maintaining declarative process models often impede their adoption. Likewise, little research has been conducted into the understanding of declarative process models. This paper takes a first step toward addressing this fundamental question and reports on an empirical investigation consisting of an exploratory study and a follow-up study focusing on the system analysts' sense-making of declarative process models that are specified in Declare. For this purpose, we distributed real-world Declare models to the participating subjects and asked them to describe the illustrated process and to perform a series of sense-making tasks. The results of our studies indicate that two main strategies for reading Declare models exist: either considering the execution order of the activities in the process model, or orienting by the layout of the process model. In addition, the results indicate that single constraints can be handled well by most subjects, while combinations of constraints pose significant challenges. Moreover, the study revealed that aspects that are similar in both imperative and declarative process modeling languages at a graphical level, while having different semantics, cause considerable troubles. This research not only helps guiding the future development of tools for supporting system analysts,but also gives advice on the design of declarative process modeling notations and points out typical pitfalls to teachers and educators of future systems analysts

Composition of context aware mobile services using a semantic context model

Context-awareness has been regarded as an important feature for mobile services. However, only a few services are sensible to context and the features that are context-aware are still limited. Composition of Web services has received much interest in business-to-business or enterprise application, but not so much interest in business-to- consumer applications. This paper presents iCas, a novel architecture that enables the creation of context-aware services on the fly, and discusses its main components. We compare our approach with similar systems and point out the main differences and advantages. To explore context-awareness to support service composition, iCas uses SeCoM, a semantic model to represent context. The main parts of this model are explained as well the advantages of using a semantic model to represent context. We also describe the use of our approach in an university campus to provide pedagogical features and assist the socio-pedagogical interaction of various types of users

Model-Driven Methodology for Rapid Deployment of Smart Spaces based on Resource-Oriented Architectures

Advances in electronics nowadays facilitate the design of smart spaces based on physical mash-ups of sensor and actuator devices. At the same time, software paradigms such as Internet of Things (IoT) and Web of Things (WoT) are motivating the creation of technology to support the development and deployment of web-enabled embedded sensor and actuator devices with two major objectives: (i) to integrate sensing and actuating functionalities into everyday objects, and (ii) to easily allow a diversity of devices to plug into the Internet. Currently, developers who are applying this Internet-oriented approach need to have solid understanding about specific platforms and web technologies. In order to alleviate this development process, this research proposes a Resource-Oriented and Ontology-Driven Development (ROOD) methodology based on the Model Driven Architecture (MDA). This methodology aims at enabling the development of smart spaces through a set of modeling tools and semantic technologies that support the definition of the smart space and the automatic generation of code at hardware level. ROOD feasibility is demonstrated by building an adaptive health monitoring service for a Smart Gym

Device Cooperation in Ad-hoc Multimedia Ensembles

Users can be overwhelmed by the abundance of functionality that smart ad-hoc environments offer. This thesis investigates how to assist the user in controlling such environments. We present an approach that enables the devices in an ad-hoc environment to cooperatively generate and execute an action sequence to fulfill the user's goals. Device cooperation happens spontaneously and in a completely distributed fashion. In a quantitative user study, we show that users accept the assistance such a system provides even if it is suboptimal.Nutzer von intelligenten Ad-hoc-Umgebungen sind oft überfordert von der Fülle an Funktionalität, die solche Umgebungen bieten. Im Mittelpunkt dieser Arbeit steht die Frage, wie man Nutzern solcher Umgebungen assistieren kann. Der vorgestellte Ansatz versetzt die Geräte in Ad-hoc-Umgebungen in die Lage, kooperativ eine Aktionssequenz zu generieren und auszuführen, die die Nutzerziele erfüllt. Die Gerätekooperation erfolgt spontan und komplett verteilt. In einer quantitativen Nutzerstudie zeigen wir, dass Nutzer die Assistenz eines solchen Systems akzeptieren, auch wenn sie suboptimal ist