Device-free indoor localization using ambient radio signals

in UbiComp-2013 Adjunct proceedings (2013)

This paper investigates feasibility of device-free indoor localization using single passive receiver. Instead of local wireless nodes sharing one frequency channel, this work leverages multiple ambient FM ... [more ▼]

This paper investigates feasibility of device-free indoor localization using single passive receiver. Instead of local wireless nodes sharing one frequency channel, this work leverages multiple ambient FM radio stations. Experimental results demonstrate feasibility of the proposed approach and highlight the role of frequency diversity for passive localization. [less ▲]

Digital Cities are not void of politics: Quayside as an example of what happens when Big Tech gets into real estate

Presentation (2019)

Digital Identity Wallets and their Semantic Contradictions

in Smethurst, Reilly (Ed.) ECIS 2023 Research Papers (2023, May 11)

In the fight for individual privacy against online surveillance and personal data breaches, blockchain developers often pitch encrypted wallets as solutions. Five examples from 2021 and 2022 involve Big ... [more ▼]

In the fight for individual privacy against online surveillance and personal data breaches, blockchain developers often pitch encrypted wallets as solutions. Five examples from 2021 and 2022 involve Big Tech companies or large European governments. On the private side, Jack Dorsey’s Block company announced the Web5 Self-Sovereign Identity (SSI) Service. Meta and Twitter added support for fictional identities – tokenised avatars or profile pictures like Bored Apes and CryptoPunks, registered to Web3 wallets that putatively offer “self-sovereign ownership”. On the public side, the European Commission funded SSI wallet trials for digital diploma credentials. Germany’s federal government launched a mobile driving licence (mDL), stored in a SSI wallet. This one term, “SSI”, is associated with varying sets of technologies and ethical principles. Following complaints that “SSI” generates confusion, I offer a typology that highlights four semantic contradictions as well as a concept map to guide future research. [less ▲]

DIGITAL TWIN FRAMEWORK FOR HUMANROBOT INTERACTION BY MEANS OF INDUSTRY 4.0 ENABLING TECHNOLOGIES

Doctoral thesis (2022)

The introduction of Industry 4.0 technologies has shaped the old form of manufactures. Despite the enormous existence of technologies such as IoT, CPS, AI or collaborative and autonomous robots in the ... [more ▼]

The introduction of Industry 4.0 technologies has shaped the old form of manufactures. Despite the enormous existence of technologies such as IoT, CPS, AI or collaborative and autonomous robots in the industrial environment and while the main objective of Industry 4.0 is to implement a better connected, flexible and smarter industrial environment, some aspects still lack to be better integrated and implemented. Among these aspects, the human-robot interaction, collaborative robot programming and simulation which still need many improvements in order to fit in the new smart environments where cobots and humans work together in hybrid teams. This research envisions the future of robot programming and robot simulation in industrial environment where humans and robots work side by side in hybrid teams. The main objective of this work was to build and demonstrate a new digital twin-based framework that is designed to enhance the human-robot interaction, robot programming and realtime in-real-environment simulation. The proposed approach required to afford a flexible real-time service-based framework for both vertical and horizontal integration. It also needed to provide an intuitive and human-friendly usage for any unskilled worker. This dissertation introduces the main six steps of the digital twin for human-robot interaction proposed framework which was adapted and modified from the common 5-C architectural design of CPSs. Its flexible architecture grants a robust integration of new devices, systems or APIs. Since this framework was initially designed for human-robot interaction, its capabilities was demonstrated through a use case study and implementation. The first three-C steps of the method (Connect, Collect and Combine) should be initiated at the beginning but executed only one time during each process life-cycle. Connection establishment between physical and digital worlds is guaranteed in step one. Data Collection from physical devices was done in step two. Combining both worlds in one scene and synchronization between twin models was accomplished during step three. Data analysis, algorithms generation and motion planning are processed in step four. Then, a simulation of digital model generated motions was visualized through mixed reality interfaces and while enabling user interaction was executed during step five. At t he e nd, after approval, robot movements are generated and actions are made by the physical twin. All-along the six steps, an horizontal technological architecture was used. First, an IoT Gateway infrastructure was established to maintain the real-time data exchange between the system’s different components. Then, a MR-based immersive interface was developed through many phases to enable digital world set-up, visualization, simulation and interaction using human gestures. At the meanwhile, a broker was implemented to handle diverse tasks mainly citing the motion planning and the AI-based object pose estimation defining. The broker is also responsible on new elements integration. At the end, implemented system approved the main objectives of the proposed research methodology which are: • Intuitive robot programming: any unskilled worker can program the robot thanks to the human-friendly interface and the autonomous assistance capabilities of the robot while estimating position and planning motions. • Realistic simulation: a simulation done in real environment with unpredicted real conditions and objects. • Flexible system integration: it is easy to integrate new devices and features thanks to the broker master interface that connects all separated elements with all their diverse interfaces and platforms. [less ▲]

Digitizing of Research and Teaching

Scientific Conference (2020, September 05)

The current Covid-19 crisis impacts all manufacturing areas and new processes are sought. This presentation provides the audience with three examples related to assembly work instructions, logistics data ... [more ▼]

The current Covid-19 crisis impacts all manufacturing areas and new processes are sought. This presentation provides the audience with three examples related to assembly work instructions, logistics data handling and manufacturing education, for which innovative ways to obtain access to context sensitive data based on digital tools are investigated. Augmented Reality (AR) and Virtual Reality (VR) facilitate access to relevant manufacturing information. In order to provide logistic warehouse workers with immediate access to shipping documents, to avoid paper print-outs, and to eliminate error-prone typing of information, critical information should be handled digitally and hands-free. To support logistic workers to efficiently document, register and trace receipt, storage or delivery of goods, the presented solution is built on hands-free digital tools with AR technology in commercially available smart glasses. Similarly, workers who execute complex assembly operations frequently require either assistance or support for the next assembly step. Depending on the context, relevant assembly process information is automatically displayed together with the environment in the AR smart glass. Thus, the operator is supported by the presented hands-free-tool to complete the next challenging tasks. Currently, teaching is being transferred from physical class-room teaching to remote or hybrid education. For this purpose, Virtual Reality (VR) provides a very welcome opportunity to complement in-presence teaching with exposure to examples of real manufacturing operations captured in videos of industrial case studies. Students apply learnings from theoretical classes to manufacturing case studies by identifying best practices and also recognizing waste. The presentation shares experience in teaching of lean methods based on AR technology to graduate engineering students. [less ▲]

Direct image-analysis methods for surgical simulation and mixed meshfree methods

Presentation (2014, May 28)

Directionality of Attacks in Natural Language Argumentation

in CEUR Workshop Proceedings (2018)

In formal (abstract and structured) argumentation theory, a central notion is that of an attack between a counterargument and the argument that it is challenging. Unlike the notion of an inconsistency ... [more ▼]

In formal (abstract and structured) argumentation theory, a central notion is that of an attack between a counterargument and the argument that it is challenging. Unlike the notion of an inconsistency between two statements in classical logic, this notion of an attack between arguments can be asymmetric, i.e. an argument A can attack an argument B without B attacking A. While this property of the formal systems studied by argumentation theorist has been motivated by considerations about the human practice of argumentation in natural language, there have not been any systematic studies on the connection between the directionality of attacks in argumentation-theoretic formalisms and the way humans actually interpret conflicts between arguments in a non-symmetric way. In this paper, we report on the result of two empirical cognitive studies that aim at filling this gap, one study with ordinary adults (undergraduate students) and one study with adult experts in formal argumentation theory. We interpret the results in light of the notions and distinctions defined in the ASPIC+ framework for structured argumentation, and discuss the relevance of our findings to past and future empirical studies about the link between human argumentation and formal argumentation theory. [less ▲]

Discrete mechanical models and upscaling techniques for discrete materials

Poster (2016)

Numerous natural and man-made materials are essentially discrete structures at the mesoscale or microscale (see Fig. 1). Discrete mechanical models can be formulated to capture typical mechanical ... [more ▼]

Numerous natural and man-made materials are essentially discrete structures at the mesoscale or microscale (see Fig. 1). Discrete mechanical models can be formulated to capture typical mechanical phenomena arising from this discreteness. Failure in these materials, which often starts with the fracture of an individual bond, can be predicted based on the small-scale mechanics with these models. For failure, but also for non-local mechanics, no phenomenological descriptions are required in these models. This makes them more predictive than constitutive material models for this type of materials. [less ▲]

Discrete Multiscale Modelling and Future Research Plans concerning Metals (presentation)

Presentation (2014, October 14)

Discretisation and Model Selection for Interface Problems in Mechanics

in International Journal of Computational Methods (2017, August 04)