| 1. |
- Claesson, Åsa, et al.
(författare)
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lntegrated Optical Fiber Sensors in Additive Manufactured Metal Components for Smart Manufacturing Applications
- 2019
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Ingår i: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems.
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Konferensbidrag (refereegranskat)abstract
- This work combines fiber optic sensors with additive manufacturing to enable integration of temperature and strain sensors in metal components. In this paper, we present a fiber optic sensor network integrated in press hardening tools to monitor the contact between the tool and the metal sheet during forming operation. The tools are manufactured through metal powder bed fusion using laser melting processes (PBF-SLM), after which the tools are prepared for sensor integration. A demonstrator press hardening tool with integrated fiber optic sensors was heated using an electric heat foil and the sensor measurements was compared to a thermal simulation model. The sensor technology is based on Fiber Bragg Gratings (FBGs), integrated at several positions along the optical fiber. FBGs are in-fiber sensors that are multiplexed. lt is possible to place hundreds of FBG sensors along one single fiber, thus allowing for quasidistributed sensing of temperature or strain. The optical fiber itself can be less than 100 micrometer in diameter, allowing for sensing at several points in a minimally invasive way, when integrated in a tool or component.
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| 2. |
- Forsström, Stefan, et al.
(författare)
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A Flexible Sensor and Actuator Gateway for Internet-of-Things Applications
- 2015
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Konferensbidrag (refereegranskat)abstract
- There is currently a vast amount of sensors, actuators, and other devices intended to create the Internet-of-Things. However, most of these only operate within a particular manufacturer’s ecosystem and with a limited set of compatible hardware. In response to this we present a general sensor and actuator gateway for the Internet-of-Things, which provides the flexibility to easily exchange sensor and actuator hardware. The gateway is implemented as a proof-of-concept prototype that is verified to be compatible with a wide range of commercial off the shelf hardware. It is also shown to be able to run the SensibleThings platform, a fully distributed and open communication platform for Internet-Things applications.
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| 3. |
- Forsström, Stefan, 1984-, et al.
(författare)
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Surveying and identifying the communication platforms of the internet of things
- 2018
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Ingår i: 2018 Global Internet of Things Summit, GIoTS 2018. - : IEEE. - 9781538664513
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Konferensbidrag (refereegranskat)abstract
- Research and industry invest time and resources in producing Internet of Things-based services, and the concept of Internet of Things platforms is climbing in the hype cycle for emerging technologies. Consequently, there is a vast number of enabling technologies, making it difficult to find the most suitable platform. The aim and goal of this article is to list and identify the currently available communication platforms for the Internet of Things. In this workwe surveyed the area and found over 128 different platforms for communication of data between things and services, out of which 42 fulfilled our listed basic requirements for being an IoT communication platform.
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| 4. |
- Imran, Muhammad, et al.
(författare)
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STC-CAM1, IR-visual based smart camera system
- 2015
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Ingår i: ACM International Conference Proceeding Series. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450336819 ; , s. 195-196
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Konferensbidrag (refereegranskat)abstract
- Safety-critical applications require robust and real-time surveillance. For such applications, a vision sensor alone can give false positive results because of poor lighting conditions, occlusion, or different weather conditions. In this work, a visual sensor is complemented by an infrared thermal sensor which makes the system more resilient in unfavorable situations. In the proposed camera architecture, initial data intensive tasks are performed locally on the sensor node and then compressed data is transmitted to a client device where remaining vision tasks are performed. The proposed camera architecture is demonstrated as a proof-ofconcept and it offers a generic architecture with better surveillance while only performing low complexity computations on the resource constrained devices.
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| 5. |
- Kardeby, Victor, et al.
(författare)
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Overlay Enhanced Mobility for the Internet of Things
- 2015
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Ingår i: Journal of Networks. - 1796-2056. ; 10:7, s. 420-430
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Tidskriftsartikel (refereegranskat)abstract
- One of the major challenges to realize the Internet of Things is to support IP mobility for the large amount of connected entities when they move between different locations and access methods. Current solutions for mobility are host centric, requiring support from the infrastructure, or breaks backwards compatibility, which will take a long time or high economic motivation to implement. Solutions for context information exchange are created for specific, small, or localized scenarios with centralized coordination that do not scale well. There is therefore a need for a solution which both scales well, and support IP mobility, without additional demands on current or future Internet infrastructure.We propose the use of a dual-overlay network structure for both information dissemination and as an alternative to current IP mobility technologies. It separates identities from location by introducing a second overlay network where the identity-to-location association is stored. We show analytically that the proposed solution provide logarithmic latency for localization and reduces the overall workload when the number of sensors per host increases beyond seven, with a workload reduction of 15 percentage points at fifteen sensors per host.
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| 6. |
- Kardeby, Victor, et al.
(författare)
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Power consumption for global information dissemination in the Internet of Things
- 2015
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Ingår i: 2015 IEEE 10th International Conference on Intelligent Sensors, Sensor Networks and Information Processing, ISSNIP 2015. - 9781479980543 ; , s. Art. no. 7106933-
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Konferensbidrag (refereegranskat)abstract
- The Internet of Things is a research topic, where billions of things, both sensing and actuating, connect to the Internet, interact, exchange information and enable intelligent services. Current resource consumption models are adapted to information distribution where the cost of information gathering is neglected. However, the emerging Internet of Things will contain billions of sensors that are capable of producing information in real-time, which both demand more resources, and is of interest to fewer users. In this paper, we present an analytical power model for both information collection and distribution in order to find the total power consumption of the Internet of Things. We apply the model to both a centralized and a distributed scenario where billions of devices produce and consume sensor information continuously. We find through analysis that there is a reduced power consumption for content traffic in distributed solutions when compared with centralized solutions for equal numbers of devices, sensors, and users. Thus, we conclude that a fully distributed solution for information gathering and dissemination is preferable to centralized solutions for retrieving the current version of information that changes often.
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| 7. |
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| 8. |
- Kardeby, Victor, et al.
(författare)
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Surveying indexing methods for the Internet of things
- 2016
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Ingår i: Internet of Things. IoT Infrastructures. - Cham : Springer. - 9783319470740 ; , s. 282-291
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Konferensbidrag (refereegranskat)abstract
- The Internet of Things is expected to expand several magnitudes in the coming decade surpassing over 50 billion devices. In the Internet of Things there is a need to support complex queries on the massive amount of information that will be made available. The scalability of the indexes used to support the queries is therefore critical. This paper therefore investigate what type of index that could scale to the size required by the Internet of Things. We find that range query is an approach that support continuously changing information and fast updates with the lowest increase in signaling per participating device.We find that a Chord-based distributed hash table hosting a NUBL range query indexing scheme will scale to the required size while supporting multidimensional range queries.
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