| 1. |
- Karvonen, Niklas, 1979-
(författare)
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Unobtrusive Activity Recognition in Resource-Constrained Environments
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis discusses activity recognition from a perspective of unobtrusiveness, where devices are worn or placed in the environment without being stigmatising or in the way. The research focuses on performing unobtrusive activity recognition when computational and sensing resources are scarce. This includes investigating unobtrusive ways to gather data, as well as adapting data modelling and classification to small, resource-constrained, devices.The work presents different aspects of data collection and data modelling when only using unobtrusive sensing. This is achieved by considering how different sensor placements affects prediction performance and how activity models can be created when using a single sensor, or when using a number of simple binary sensors, to perform movement analysis, recognise everyday activities, and perform stress detection. The work also investigates how classification can be performed on resource-constrained devices, resulting in a novel computation-efficient classifier and an efficient hand-made classification model. The work finally sets unobtrusive activity recognition into real-life contexts where it can be used for interventions to reduce stress, sedentary behaviour and symptoms of dementia.The results indicate that activities can be recognised unobtrusively and that classification can be performed even on resource-constrained devices. This allows for monitoring a user’s activities over extensive periods, which could be used for creating highly personal digital interventions and in-time advice that help users make positive behaviour changes. Such digital health interventions based on unobtrusive activity recognition for resource-constrained environments are important for addressing societal challenges of today, such as sedentary behaviour, stress, obesity, and chronic diseases. The final conclusion is that unobtrusive activity recognition is a cornerstone necessary for bringing many digital health interventions into a wider use.
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| 2. |
- Paniagua, Cristina
(författare)
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Autonomous Runtime System of Systems Interoperability
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The current technological environment is evolving increasingly fast, and the development of new devices, technologies, and architectures has opened an emergent paradigm where the digital and physical world work together, leading to a new digitalizacion era.For the industry, the shift of paradigm represents the start of the fourth industrial revolution, also called Industry 4.0. The Industry 4.0 approach contributes to addressing continuously evolving industrial requirements, and promotes the rise of efficiency and sustainability on industrial production. The implementation and use of systems based on a Service Oriented Architecture (SOA) in conjunction with the Internet of Things (IoT) and Cyber-Physical Systems (CPS) into System of Systems (SoS) have been extended during the last decades in numerous scenarios contributing to reach the Industry 4.0 vision.The new industrial paradigm leads to growing complexity, thus, potentially increasing the development and maintenance costs. Significant engineering time is dedicated to the integration and interoperability of different components. Therefore, one of the major barriers to this approach is the lack of interoperability between heterogeneous systems.This thesis proposes a set of architectural design principles and tools in order to reduce engineering effort by means of finding solutions that enable autonomous integration and increase interoperability without human intervention. The research is focused on the SoS field, taking service definition and SoS integration into account.The presented solution is an service contract translation system that can aid in the generation of new service consumer interfaces at both compile time and runtime. The proposed approach requires a new point of view in the service contract that can provide a holistic description of the information required for the generation of consumer interfaces. The proposed system makes use of service interface descriptions to dynamically instantiate a new autonomously generated interface that solves communication mismatches between the provider and the consumer. To illustrate the potential of this approach, a prototype of the system has been implemented and testedIn addition, aspects related to interoperability, such as the many IoT frameworks in the current market, naming conventions, syntactic modeling and translation, and security, are also partially analyzed.
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