An Approach Based on VR to Design Industrial Human-Robot Collaborative Workstations

This paper presents an integrated approach for the design of human–robot collaborative workstations in industrial shop floors. In particular, the paper presents how to use virtual reality (VR) technologies to support designers in the creation of interactive workstation prototypes and in early validation of design outcomes. VR allows designers to consider and evaluate in advance the overall user experience, adopting a user-centered perspective. The proposed approach relies on two levels: the first allows designers to have an automatic generation and organization of the workstation physical layout in VR, starting from a conceptual description of its functionalities and required tools; the second aims at supporting designers during the design of Human–Machine Interfaces (HMIs) by interaction mapping, HMI prototyping and testing in VR. The proposed approach has been applied on two realistic industrial case studies related to the design of an intensive warehouse and a collaborative assembly workstation for automotive industry, respectively. The two case studies demonstrate how the approach is suited for early prototyping of complex environments and human-machine interactions by taking into account the user experience from the early phases of design.

Pipe Dreams of the Nouveaux Riches

World expos are occasions for the type of rhetorical display known as "epideictic," and as such, they provide glimpses into how a nation wants to be seen at a particular point in time. In this article, I probe into Norway’s pavilion at the 1992 expo in Seville, Spain, for answers to what Norway wanted to be in the early 1990s. I will argue that Norway’s pavilion, a “deconstructed structure” that centered on a somewhat ambiguous pipe, signals a country in the process of reinventing itself under the aegis of petroleum. More specifically, I suggest that Norway’s ’92 pavilion can be read as an early instantiation of rhetorical techniques that would later become key to Norway’s claim to being both a leading petroleum producer and an environmental frontrunner. The pavilion itself pulled off this balancing act in much the same way that politicians and others would later learn to handle it – by techniques of rhetorical association and dissociation (Perelman & Olbrechts-Tyteca 1969 [1958]). Having chosen “the cycle of water” as the overarching theme for the exhibition, the makers of the pavilion (the largest sponsor of which was the state oil company, Statoil) managed to make petroleum safe by renaming it “offshore” and by associating it, also in many other ways, with water. The pavilion’s deconstructive architecture can thus be understood as an early validation of the rhetorical practice of “putting together” and “taking apart” to make new things that serve the nation’s interests – in this case a “cycle of water” in which petroleum was a natural part. Although I posit only similarity, and not causality, the rhetorical techniques of Norway’s ’92 pavilion were in this way strikingly similar to what later became a stock argument, e.g. that Norway offers “the world’s cleanest petroleum” (see Ihlen 2007).

The Validity of Ultrasound Technology in Providing an Indirect Estimate of Muscle Glycogen Concentrations Is Equivocal

Researchers and practitioners in sports nutrition would greatly benefit from a rapid, portable, and non-invasive technique to measure muscle glycogen, both in the laboratory and field. This explains the interest in MuscleSound®, the first commercial system to use high-frequency ultrasound technology and image analysis from patented cloud-based software to estimate muscle glycogen content from the echogenicity of the ultrasound image. This technique is based largely on muscle water content, which is presumed to act as a proxy for glycogen. Despite the promise of early validation studies, newer studies from independent groups reported discrepant results, with MuscleSound® scores failing to correlate with the glycogen content of biopsy-derived mixed muscle samples or to show the expected changes in muscle glycogen associated with various diet and exercise strategies. The explanation of issues related to the site of assessment do not account for these discrepancies, and there are substantial problems with the premise that the ratio of glycogen to water in the muscle is constant. Although further studies investigating this technique are warranted, current evidence that MuscleSound® technology can provide valid and actionable information around muscle glycogen stores is at best equivocal.

Characteristics, potentials, and limitations of open-source Simulink projects for empirical research

Simulink is an example of a successful application of the paradigm of model-based development into industrial practice. Numerous companies create and maintain Simulink projects for modeling software-intensive embedded systems, aiming at early validation and automated code generation. However, Simulink projects are not as easily available as code-based ones, which profit from large publicly accessible open-source repositories, thus curbing empirical research. In this paper, we investigate a set of 1734 freely available Simulink models from 194 projects and analyze their suitability for empirical research. We analyze the projects considering (1) their development context, (2) their complexity in terms of size and organization within projects, and (3) their evolution over time. Our results show that there are both limitations and potentials for empirical research. On the one hand, some application domains dominate the development context, and there is a large number of models that can be considered toy examples of limited practical relevance. These often stem from an academic context, consist of only a few Simulink blocks, and are no longer (or have never been) under active development or maintenance. On the other hand, we found that a subset of the analyzed models is of considerable size and complexity. There are models comprising several thousands of blocks, some of them highly modularized by hierarchically organized Simulink subsystems. Likewise, some of the models expose an active maintenance span of several years, which indicates that they are used as primary development artifacts throughout a project’s lifecycle. According to a discussion of our results with a domain expert, many models can be considered mature enough for quality analysis purposes, and they expose characteristics that can be considered representative for industry-scale models. Thus, we are confident that a subset of the models is suitable for empirical research. More generally, using a publicly available model corpus or a dedicated subset enables researchers to replicate findings, publish subsequent studies, and use them for validation purposes. We publish our dataset for the sake of replicating our results and fostering future empirical research.