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1.	Bacos, Karl, et al. (författare) Type 2 diabetes candidate genes, including PAX5, cause impaired insulin secretion in human pancreatic islets 2023 Ingår i: The Journal of clinical investigation. - 0021-9738 .- 1558-8238. ; 133:4 Tidskriftsartikel (refereegranskat)abstract Type 2 diabetes (T2D) is caused by insufficient insulin secretion from pancreatic β-cells. To identify candidates contributing to T2D pathophysiology, we studied human pancreatic islets from ~300 individuals. We found 395 differentially expressed genes (DEGs) in islets from individuals with T2D, including, to our knowledge, novel (OPRD1, PAX5, TET1) and previously identified (CHL1, GLRA1, IAPP) candidates. A third of the identified islet expression changes may predispose to diabetes, as they associated with HbA1c in individuals not previously diagnosed with T2D. Most DEGs were expressed in human β-cells based on single-cell RNA-sequencing data. Additionally, DEGs displayed alterations in open chromatin and associated with T2D-SNPs. Mouse knock-out strains demonstrated that T2D-associated candidates regulate glucose homeostasis and body composition in vivo. Functional validation showed that mimicking T2D-associated changes for OPRD1, PAX5, and SLC2A2 impaired insulin secretion. Impairments in Pax5-overexpressing β-cells were due to severe mitochondrial dysfunction. Finally, we discovered PAX5 as a potential transcriptional regulator of many T2D-associated DEGs in human islets. Overall, we identified molecular alterations in human pancreatic islets contributing to β-cell dysfunction in T2D pathophysiology.
2.	Bicaku, Ani, 1988-, et al. (författare) Interacting with the arrowhead local cloud : On-boarding procedure 2018 Konferensbidrag (refereegranskat)abstract Industrial automation systems are advancing rapidly and a wide range of standards, communication protocols and platforms supporting the integration of devices are introduced. It is therefore necessary to design and build appropriate tools and frameworks that allow the integration of devices with multiple systems and services. In this work we present the Arrow-head Framework, used to enable collaborative IoT automation and introduce two support core systems, SystemRegistry and DeviceRegistry, which are needed to create a chain of trust from a hardware device to a software system and its associated services. Furthermore, we propose an on-boarding procedure of a new device interacting with the Arrowhead local cloud. This ensures that only valid and authorized devices can host software systems within an Arrowhead local cloud.
3.	Birk, Wolfgang, et al. (författare) iRoad - cooperative road infrastructure systems for driver support 2009 Ingår i: 16th World Congress and Exhibition on Intelligent Transport Systems 2009. - Red Hook : Curran Associates, Inc.. - 9781617385896 Konferensbidrag (refereegranskat)abstract This paper discusses the design and implementation of a cooperative road infrastructure systems, which uses an intelligent road surface. Using an overtaking assist feature as an example it is shown how such a feature can be designed and implemented on a road infrastructure and integrated with drivers and passengers using IMS. The feasibility of this feature is assessed from a functional and communication perspective. Moreover, first results from real-life tests on the Swedish highway E4 are presented which motivate the next research and development steps.
4.	Birk, Wolfgang, et al. (författare) Project: iRoad 2011 Annan publikation (populärvet., debatt m.m.)
5.	Birk, Wolfgang, et al. (författare) Road surface networks technology enablers for enhanced ITS 2010 Ingår i: 2010 IEEE Vehicular Networking Conference, VNC 2010. - Piscataway, NJ : IEEE Communications Society. - 9781424495269 ; , s. 152-159 Konferensbidrag (refereegranskat)abstract The increased need for mobility has led to transportation problems like congestion, accidents and pollution. In order to provide safe and efficient transport systems great efforts are currently being put into developing Intelligent Transport Systems (ITS) and cooperative systems. In this paper we extend proposed solutions with autonomous on-road sensors and actuators forming a wireless Road Surface Network (RSN). We present the RSN architecture and design methodology and demonstrate its applicability to queue-end detection. For the use case we discuss the requirements and technological solutions to sensor technology, data processing and communication. In particular the MAC protocol is detailed and its performance assessed through theoretical verification. The RSN architecture is shown to offer a scalable solution, where increased node density offers more precise sensing as well as increased redundancy for safety critical applications. The use-case demonstrates that RSN solutions may be deployed as standalone systems potentially integrated into current and future ITS. RSN may provide both easily deployable and cost effective alternatives to traditional ITS (with a direct impact independent of penetration rate of other ITS infrastructures - i.e., smart vehicles, safe spots etc.) as well as provide fine grain sensory information directly from the road surface to back-end and cooperative systems, thus enabling a wide range of ITS applications beyond current state of the art.
6.	Blomstedt, Fredrik, et al. (författare) The Arrowhead Approach for SOA Application Development and Documentation 2015 Ingår i: IECON 2014. - Piscataway, NJ : IEEE Communications Society. - 9781479940318 - 9781479940325 ; , s. 2631-2637 Konferensbidrag (refereegranskat)abstract The Arrowhead project aims to address the technical and applicative issues associated with cooperative automation based on Service Oriented Architectures. The problems of developing such kind of systems are mainly due to the lack of adequate development and service documentation methodologies, which would ease the burden of reusing services on different applications. The Arrowhead project proposes a technical framework to efficiently support the development of such systems, which includes several tools for documentation of services and to support the development of SOA-based installations. The work presented in this paper describes the approach which has been developed for the first generation pilots to support the documentation of their structural services. Each service, system and system- of-systems within the Arrowhead Framework must be documented and described in such way that it can be implemented, tested and deployed in an interoperable way. This paper presents the first steps of realizing the Arrowheadvision for interoperable services, systems and systems-of-systems.
7.	Borodina, I., et al. (författare) Metabolic engineering of streptomyces 2009 Ingår i: The Metabolic Pathway Engineering Handbook: Fundamentals. - 9781439802977 ; , s. 24-1-24-30 Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract Some of the common soil microorganisms are actinomycetes, Gram-positive bacteria with high GC content. Because of their mycelial habit they were initially believed to be fungi, which reected in their name (mucus (lat.) means fungus). In 1939, one year before rediscovery of penicillin by Florey and Chain, soil microbiologist Waksman has set his lab on a quest for new antimicrobial drugs. From the previous studies he knew that actinomycetes can inhibit the growth of other soil bacteria through secretion of bioactive compounds, which he named “antibiotics” (anti (lat.) against, bio (lat.) life). Systematic search for antibiotics produced by actinomycetes resulted in the discovery of actinomycin (1940), clavacin, and streptothricin (1942), all of them sadly turned out to be toxic in animal tests. In 1943 Waksman’s student Schatz isolated streptomycin-producing strain of Streptomyces griseus.1 Streptomycin was not particularly toxic to animals and humans, but remarkably was the rst compound active against tuberculosis bacteria. Many pharmaceutical companies and research laboratories started to collect soil samples from all over the world in search of antibiotics-producing organisms. Most of the discoveries were made in the rst ten years of the “hunt,” the larger part involved Streptomyces species. Streptomyces is a genus in the genera of actinomycetes, many of these bacteria produce volatile compounds that give the earth its characteristic odor. Streptomyces proved to be an excellent source of secondary metabolites, including antibiotics, anticancerous agents, antihelmintic drugs, and other useful compounds (Table 24.1). At present more than half of antibiotics in clinical use are produced in Streptomyces species.
8.	Brodin, Gert, 1963-, et al. (författare) Plasma dynamics at the Schwinger limit and beyond 2023 Ingår i: Physical review. E. - : American Physical Society. - 2470-0045 .- 2470-0053. ; 107:3 Tidskriftsartikel (refereegranskat)abstract Strong field physics close to or above the Schwinger limit are typically studied with vacuum as initial condition or by considering test particle dynamics. However, with a plasma present initially, quantum relativistic mechanisms such as Schwinger pair creation are complemented by classical plasma nonlinearities. In this work we use the Dirac-Heisenberg-Wigner formalism to study the interplay between classical and quantum mechanical mechanisms in the regime of ultrastrong electric fields. In particular, the effects of initial density and temperature on the plasma oscillation dynamics are determined. Finally, comparisons with competing mechanisms such as radiation reaction and Breit-Wheeler pair production are made.
9.	Carlsson, Oscar, et al. (författare) Configuration Service in Cloud based Automation Systems 2016 Ingår i: IECON Proceedings (Industrial Electronics Conference). - Piscataway, NJ : IEEE Computer Society. ; , s. 5238-5245 Konferensbidrag (refereegranskat)abstract Current challenges in production automation requires the involvement of new technologies like Internet of Things (IoT), Systems of Systems and local automation clouds. The objective of this paper is to address one of the challenges involved in establishing and managing a cloud based automation system. Three key capabilities have been identified as required to create the expected benefits of local automation clouds; 1) capturing of plant design 2) capturing and distributing configuration and deployment information 3) coordinating information exchange.This paper addresses the capturing and distribution of configuration and deployment information. For this purpose a system service is proposed, the ConfigurationStore, following the principles of the Arrowhead Framework. The service is accompanied by a deployment methodology and a bootstrapping procedure. These are discussed for several types of automation technology, e.g. controllers, sensors, actuators. A qualitative evaluation of the proposed approach is made for four use cases; Building automation, Manufacturing automation, Process automation and IoT devices. Concluding the usability for large-scale deployment and configuration of Industrial Internet of Things.
10.	Carlsson, Oscar (författare) Engineering of IoT Automation Systems 2017 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract Major societal challenges such as environmental sustainability, availability of energy and raw materials, and globalisation are creating new requirements for many actors in society. These new requirements relate to efficiency, flexibility, sustainability, and competitiveness. While these aspects have all been around for some time, and many systems have been locally optimised with regards to one or a few of these requirements, recent advances in communication and processing capabilities promise increased possibilities for connecting different parts of society, allowing optimal operation on a much larger scale.While industrial production systems have been controlled electronically for decades, the digitisation of market channels and consumer systems, together with the possibility to interconnect different production facilities, now allow for automated interaction along the whole supply chain from raw materials to end users.Simultaneously, increased demand for efficiency forces increased specialisation among actors, which with increased possibilities of interconnectivity, creates large enterprises of cooperating, specialised stakeholders.One of the major remaining obstacles for a widespread adaptation of more intelligent, more connected systems, able to deliver these envisioned results, is a coherent approach to the engineering and management of Systems-of-Systems involving very large numbers of devices and operating across several automation domains.For traditional automation systems there are established engineering procedures and numerous standards for engineering data, although most are focused on the static processes that have traditionally been the norm. For full integration with a digital society many of the existing automation systems will need significant modifications and as many automation systems are ageing and in need of replacement, a suitable solution to this may be a large scale migration to new automation solutions.The work presented in this thesis includes some new approaches and methodologies to utilise the existing engineering procedures and standards, while introducing some of the flexibility proposed by the emerging technologies. The major technical solutions presented consist of a structure way to organise connected systems and how they are related, regardless of engineering standards used to design their interactions, and an approach to allow configuration of heterogeneous systems through service interactions.Further contributions include an approach for migrating certain categories of existing industrial control systems to a service oriented architecture, as a basic outline for adaption of the next generation of automation systems in industry.Certain remaining challenges have been identified, which have to be addressed for a successful launch of widespread interconnected automation systems based on Internet of Things and associated technologies.
11.	Casselgren, Johan, et al. (författare) Road surface information system 2013 Ingår i: Proceedings of the 16th SIRWEC conference. - : Standing International Road Weather Commission. Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract In order to classify the road condition, dry asphalt and asphalt covered with water, ice and snow a technique using a sensor called Road eye is presented. The Road eye sensor uses three wavelengths and one photo detector to determine the intensities that are reflected from the road surface and is then able to estimate the road condition. By linking the Road eye sensor to a GPS and a Mulle, a miniature wireless Embedded Internet System, the road conditions can be associated with the correct road position, making it possible to use the information in many different applications.
12.	Cats, Oded, et al. (författare) A dynamic stochastic model for evaluating congestion and crowding effects in transit systems 2016 Ingår i: Transportation Research Part B. - : Elsevier. - 0191-2615 .- 1879-2367. ; 89, s. 43-57 Tidskriftsartikel (refereegranskat)abstract One of the most common motivations for public transport investments is to reduce congestion and increase capacity. Public transport congestion leads to crowding discomfort, denied boardings and lower service reliability. However, transit assignment models and appraisal methodologies usually do not account for the dynamics of public transport congestion and crowding and thus potentially underestimate the related benefits. This study develops a method to capture the benefits of increased capacity by using a dynamic and stochastic transit assignment model. Using an agent-based public transport simulation model, we dynamically model the evolution of network reliability and on-board crowding. The model is embedded in a comprehensive framework for project appraisal.A case study of a metro extension that partially replaces an overloaded bus network in Stockholm demonstrates that congestion effects may account for a substantial share of the expected benefits. A cost-benefit analysis based on a conventional static model will miss more than a third of the benefits. This suggests that failure to represent dynamic congestion effects may substantially underestimate the benefits of projects, especially if they are primarily intended to increase capacity rather than to reduce travel times.
13.	Cats, Oded, et al. (författare) Appraisal of increased public transport capacity : The case of a new metro line to Nacka, Sweden 2014 Rapport (övrigt vetenskapligt/konstnärligt)
14.	Charlier, Maximilien, et al. (författare) Support for IEEE 802.15.4 Ultra Wideband Communications in the Contiki Operating System 2016 Ingår i: IEEE Symposium on Communications and Vehicular Technology in the Benelux (SCVT). - Piscataway, NJ : Institute of Electrical and Electronics Engineers (IEEE). - 9781509043613 Konferensbidrag (refereegranskat)abstract The use of UWB for Industrial Internet of Things (IIoT) applications benefits from the following four main properties; 1) scalability due to the inherent short transmissions times of the UWB radio, 2) bandwidth-consuming applications such as condition monitoring with vibration sensing, 3) applications with real-time positioning (RTLS) requirements, and 4) wireless communication in electromagnetically harsh environments with a high level of multipath fading. In this paper, we present a UWB-based 6LoWPAN implementation in the Contiki OS as a step towards incorporating UWB in the industrial IoT domain.
15.	del Campo, Sergio Martin, et al. (författare) FPGA prototype of machine learning analog-to-feature converter for event-based succinct representation of signals 2013 Ingår i: IEEE International Workshop on Machine Learning for Signal Processing. - Piscataway, NJ : IEEE Signal Processing Society. Konferensbidrag (refereegranskat)abstract Sparse signal models with learned dictionaries of morphological features provide efficient codes in a variety of applications. Such models can be useful to reduce sensor data rates and simplify the communication, processing and analysis of information, provided that the algorithm can be realized in an efficient way and that the signal allows for sparse coding. In this paper we outline an FPGA prototype of a general purpose "analog-to-feature converter", which learns an overcomplete dictionary of features from the input signal using matching pursuit and a form of Hebbian learning. The resulting code is sparse, event-based and suitable for analysis with parallel and neuromorphic processors. We present results of two case studies. The first case is a blind source separation problem where features are learned from an artificial signal with known features. We demonstrate that the learned features are qualitatively consistent with the true features. In the second case, features are learned from ball-bearing vibration data. We find that vibration signals from bearings with faults have characteristic features and codes, and that the event-based code enable a reduction of the data rate by at least one order of magnitude.
16.	Delsing, Jerker, et al. (författare) A migration approach towards a SOA-based next generation process control and monitoring 2012 Ingår i: IECON 2011. - Piscataway, NJ : IEEE Communications Society. - 9781612849690 ; , s. 4319-4324 Konferensbidrag (refereegranskat)abstract Interest in Service Oriented Architectures (SOA) in the automation domain has seen a rapid increase both from the academia as well as the industry recent years. Since green field plants today are not common, the partial migration of plant automation to SOA design is needed to introduce new functionalities. Thus strategies and approaches for migration from legacy to SOA architectures becomes of vital interest. This paper discusses different views on partial migration of a process monitoring and control system from legacy to SOA. The discussion includes a global top down view, a bottom up view, hardware/software considerations and a hint on training of personnel.
17.	Delsing, Jerker, 1957-, et al. (författare) Arrowhead Framework core systems and services 2017 Ingår i: IoT Automation. - Boca Raton, FL : CRC Press. - 9781498756754 - 9781498756761 ; , s. 89-138 Bokkapitel (refereegranskat)
18.	Delsing, Jerker, et al. (författare) Building System of Systems with SOA Technology : A Smart House Use Case 2014 Ingår i: Industrial Cloud-Based Cyber-Physical Systems. - Cham : Encyclopedia of Global Archaeology/Springer Verlag. - 9783319056234 - 9783319056241 ; , s. 219-230 Bokkapitel (refereegranskat)abstract The IMC-AESOP architecture has been used to implemente a smart house demonstration. Six different systems has been integrated with local (802.11, 802.15.4) and global (telecom) communication. The six systems integrated are: Car arrival detection system, Garage door opening system, House security system, External house lightning system, External electrical outlet system, House energy control system. The SOA technologies used are CoAP and EXI using SenML to encode the services. Engineering tools have been used to simulate the usage scenario and provide prediction of system behaviour.
19.	Delsing, Jerker, 1957-, et al. (författare) Concepts and Architecture for a Thumb-Sized Smart IoT Ultrasound Measurement System 2016 Ingår i: IEEE Ultrasonic Symposium 2016. - Piscataway, NJ : IEEE conference proceedings. - 9781479981823 - 9781467398978 Konferensbidrag (refereegranskat)abstract This paper presents the technology concepts for a “thumb”-sized self-contained ultrasonic IoT measurement sys- tem. An overall architecture is proposed, and key elements are discussed with solutions using existing technology, thus arguing that realization is possible with the current technology.Such an ultrasonic IoT measurement system is constrained by its size and available energy, although it requires at least decent computational and communication resources. Because streaming data from such a device is not advisable from an energy viewpoint, there is a need for resource efficient (energy, memory and computational power) data analysis.An architecture with the following parts as well as some implementation details and performance data are proposed here:Energy supply, battery and super capacitorTransducer excitation achieving almost zero electrical lossesEvent detection sensor interfaceData aggregation using sparse approximation and learnedfeature dictionaries, adapted to resource constrained em-bedded systemsIoT communication protocols and implementations enablingevent -based communication and System of Systems integra- tion capabilitiesThe optimization of system level performance requires each subsystem to be optimized for the specific measurement situation taking into account the subsystem interdependencies. This can be performed using a combined electrical and acoustical model of the system. Here, the model allowing electronic and acoustic co-simulation using SPICE is an important tool bridging the electronic and acoustic domains.
20.	Delsing, Jerker, et al. (författare) Enabling IoT automation using local clouds 2016 Ingår i: Proceedings IEEE World Forum on Internet of Things. - Piscataway, NJ : IEEE Computer Society Digital Library. - 9781509041305 ; , s. 501-507 Konferensbidrag (refereegranskat)abstract Various forms of cloud computing principles and technologies are becoming important recently. This paper ad- dresses cloud computing for automation and control applications. It’s argued that the open Internet cloud idea has such limitations that its not appropriate for automation.Since automation is physically and geographically local, it is inevitable to introduce the concept of local automation clouds. It’s here proposed that local automation clouds should be self contained an be able to execute the intended automation func- tionalities without any external resources. Thus providing a fence at the rim of the local cloud preventing any inbound or outbound communication. Such a local cloud provides possibilities to address key requirements of both todays and future automation solutions. Adding mechanisms for secure inter-cloud administra- tion and data tranfere enables local automation cloud to meet IoT automation system requirements as: 1) Interoperability of a wide range of IoT and legacy devices 2) Automation requirement on latency guarantee/prediction for communication and control computations. 3) Scalability of automation systems enabling very large integrated automation systems 4) Security and related safety of automation systems 5) Ease of application engineering 6) Multi stakeholder integration and operations agility.How these requirements can be met in such a local automation cloud is discussed with references to proposed solutions. The local automation cloud concept is further verified for a compartment climate control application. The control application included an IoT controller, four IoT sensors and actuators, and a physical layer communication gateway. The gateway acted as host for local cloud core functionalities. The climate control application has successfully been implemented using the open source Arrowhead Framework and its supports for design and implementation of self contained local automation clouds.
21.	Delsing, Jerker, et al. (författare) Latency and packet loss of an interferred 802.15.4 channel in an industrial environment 2010 Ingår i: Fourth International Conference on Sensor Technologies and Applications, SENSORCOMM. - : International Academy, Research and Industry Association (IARIA). ; , s. 33-38 Konferensbidrag (refereegranskat)abstract There is currently a rapid development of new types of wireless communication channels for industrial automation. This paper aims to provide some experimental data and theoretical justification on packet latency and packet loss for a wireless communication channel exposed to intentional radio interference. The intentional radio interference used in the experiments is an attempt to simulate possible future co-existence scenarios in a dense wireless communication environment at an industrial site. For the cases tested packet loses of less than 10% was obtained. Latency is shown to depend on channel access and will has a deterministic behaviour.
22.	Delsing, Jerker, et al. (författare) Project: Arrowhead 2014 Annan publikation (populärvet., debatt m.m.)
23.	Delsing, Jerker, 1957-, et al. (författare) The Arrowhead Framework architecture 2017 Ingår i: IoT Automation. - Boca Raton, FL : CRC Press. - 9781498756754 - 9781498756761 ; , s. 43-88 Bokkapitel (refereegranskat)
24.	Delsing, Jerker, et al. (författare) The IoT Rockbolt 2015 Konferensbidrag (refereegranskat)abstract The use of rock bolts in the mining industry is a widely used approach for increasing mine stability. Here we demonstrate an IoT rockbolt with strain and accelerometer sensors. By utilizing the real-time monitoring capabilities of a network of IoT rockbolts, open up for drastically improve monitoring of mining activities and thereby providing real time logistics and operational information while at the same time provide working safety information.
25.	Derhamy, Hasan, et al. (författare) A survey of commercial frameworks for the Internet of Things 2015 Ingår i: Proceedings of 2015 IEEE 20th International Conference on Emerging Technologies & Factory Automation (ETFA 2015). - Piscataway, NJ : IEEE Communications Society. - 9781467379298 Konferensbidrag (refereegranskat)abstract In 2011 Ericsson and Cisco estimated 50 billion Internet connected devices by 2020, encouraged by this industry is developing application frameworks to scale the Internet of Things. This paper presents a survey of commercial frameworks and platforms designed for developing and running Internet of Things applications. The survey covers frameworks supported by big players in the software and electronics industries. The frameworks are evaluated against criteria such as architectural approach, industry support, standards based protocols and interoperability, security, hardware requirements, governance and support for rapid application development. There is a multitude of frameworks available and here a total 17 frameworks and platforms are considered. The intention of this paper is to present recent developments in commercial IoT frameworks and furthermore, identify trends in the current design of frameworks for the Internet of Things; enabling massively connected cyber physical systems.
26.	Derhamy, Hasan (författare) Architectural Design Principles For Industrial Internet of Things 2018 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract As society has progressed through periods of evolution and revolution, technology hasplayed a key role as an enabler. In the same manner that mechanical machines of the1800’s drove the industrial revolution, now digitalized machines are driving another one.With this recognition of a fourth industrial revolution, the Industry 4.0 initiative wasfounded. One of the drivers of Industry 4.0 is the Industrial Internet of Things (IIoT).The IIoT is a consequence of widely present computing ubiquity and interconnected-ness. Software has become a crucial tool of almost all industries from bakeries and arts to manufacturing facilities and banking. Programming is now a required competenceand used by a variety of professions. It is not only about algorithm development, it has become more about engineering and integrating existing designs and tools. This impacts the way software is architected and drives a large body of research in the area.Software solutions are becoming more distributed, not only over multiple processes, but over heterogeneous hardware and business domains. Computing platforms could bemobile or geographically separated over large distances, exposing the solutions to network disturbances, performance degradation and security vulnerabilities.Hence, IIoT introduces complexity on a scale previously unseen in the software in-dustry. Software architecture must accommodate these heterogeneous domains and com-petencies and handle the increasing levels of complexity.This thesis proposes an architectural style for designing IIoT software architectures.The popular Service Oriented Architecture (SOA) style is not sufficient to define a com-plete architecture for IIoT applications. SOA fundamental principles are defined as loose coupling, lookup and late binding. The proposed architecture style extends these SOA principles with autonomy, specialization, data at its source and first person perspective. It preserves the benefits of SOA that models functionalities as reusable services with standardized interfaces. Thus, the proposed style helps to capture the heterogeneity of IIoT (e.g. systems, capabilities, domains, competencies etc.), while handling challenges imposed by it. The style also captures resource constraints of IIoT platforms; distri-bution of application logic across IIoT; dependence between services within IIoT; and presentation of the solution in various stakeholder perspectives.The IIoT generates large amounts of data that is subsequently stored, analysed, archived and eventually fed back into the product life cycle. Centralization of data has well known challenges. This thesis proposes a method of information extraction based on the principle of data at its source. Such data preserves implicit context, reducing the burden of semantic data within the system. Desired information is expressed through dynamic (runtime) queries. Using the queries, a path is created to retrieve the requested data. It alleviates the need for data to be stored in intermediary nodes; data remains atthe source. Thus, IIoT applications extract information and present it to requesting sys-tems without redundant source related context. This helps with issues of data ownership, access control and stale data.Another IIoT challenge tackled in this work is decentralization of Manufacturing Execution System (MES). It is motivated by a need to mitigate the impact of vulnerable shared networks on the factory floor; and by business requirements to reduce dependence on local factory infrastructure. This thesis explores a solution where functions of MES are distributed to the workstations that enables them to operate autonomously. Such autonomous workstations utilize the proposed Intelligent Product, Workflow Managerand Workflow Executor systems. Thus, MES can be decentralized to edge nodes as envisioned by Industry 4.0.
27.	Derhamy, Hasan, et al. (författare) In-network Processing for Context-Aware SOA-based Manufacturing Systems 2017 Ingår i: Proceedings IECON 2017. - Piscataway, NJ : Institute of Electrical and Electronics Engineers (IEEE). - 9781538611272 ; , s. 3460-3465 Konferensbidrag (refereegranskat)abstract To achieve flexible manufacturing, increasingly large amounts of data are being generated, stored, analyzed, archived and eventually fed back into the product life cycle. But where is this data stored and how is it transported? Current methods rely on centralized or federated databases to manage the data storage. This approach has several challenges, such as collection bottlenecks, secure retrieval, single point of failure and data-scheme fragility as data heterogeneity increases. Additionally, manufacturers are finding the need to open their networks for service based equipment suppliers. This means previous security assumptions regarding network encryption and information access-control must be re-evaluated. Proposed here is a method of in-network processing that gathers information only where and when it is needed. Systems build context at runtime by creating dynamic queries which make service composition. The service composition processes raw data and presents it as information to the calling system. This reduces the movement of data/information and removes single point collection bottlenecks. Furthermore, fine grained access control and shared trust can be granted between untrusted systems. The proposed methods are demonstrated on a lab setup of an industrial use case.
28.	Derhamy, Hasan, et al. (författare) IoT Interoperability : On-demand and low latency Transparent Multi-protocol Translator 2017 Ingår i: IEEE Internet of Things Journal. - : Institute of Electrical and Electronics Engineers (IEEE). - 2327-4662. ; 4:5, s. 1754-1763 Tidskriftsartikel (refereegranskat)abstract In the Industrial Internet of Things there is a clear need for a high level of interoperability between independently developedsystems, often from different vendors. Traditional methods of interoperability including protocol gateways and adapters, are often usedat the network layer. Recent work on application interoperability has emphasized the use of middleware or protocol proxy/gateway.However, middleware tends to move the interoperability problem rather than solving it, and there are scalability issues with increasingthe number of proxies; re-configuration effort, and required bandwidth and processing overheads.This paper proposes a secure, on-demand and transparent protocol translator for the Industrial Internet of Things. Targeting thechallenge of interoperability between IP-based communication protocols, the paper analyses current solutions and develops a set ofrequirements to be met by IoT protocol interoperability. The proposed protocol translator is not a middleware, it is a SOA-basedparticipant, it is used on-demand when needed, it does not introduce design time dependencies, it operates transparently, it supportslow-latency, and it is secured through the use of Arrowhead authorization and authentication.
29.	Derhamy, Hasan, et al. (författare) Orchestration of Arrowhead services using IEC 61499 : Distributed Automation Case Study 2016 Ingår i: Proceedings of 2016 IEEE 20th International Conference on Emerging Technologies & Factory Automation (ETFA 2016). - Piscataway, NJ : IEEE Communications Society. - 9781467379298 Konferensbidrag (refereegranskat)abstract This paper presents a novel approach to automationof flexible manufacturing systems with mechatronic intelligenceand distributed control. The mechatronic intelligence layer isimplemented using a combination of wireless sensor/actuatornetworks with service-oriented architecture, where services arelocated at the device level, as well as in local and global Cloudsfollowing the Arrowhead framework.The machine/floor level coordination is implemented using thedistributed automation architecture of IEC 61499, which is alsoused as a graphical tool for orchestration of services.The paper discusses the enablers developed in-order to combineIEC 61499 and Arrowhead and the use is illustrated ona laboratory scale flexible factory example. By integration ofIndustrial IoT with IEC 61499, we envision that large gains interms of engineering effort and system operation performancecan be made.
30.	Derhamy, Hasan, et al. (författare) Protocol interoperability of OPC UA in ServiceOriented Architectures 2017 Ingår i: Proceedings. - Piscataway, NJ : Institute of Electrical and Electronics Engineers (IEEE). - 9781538608371 ; , s. 44-50 Konferensbidrag (refereegranskat)abstract Abstract—Industrial Internet of Things covers all aspects ofnetworked intelligent manufacturing systems. This means coveringa wide array of application domains and user requirements.In such scenarios it is not feasible to define a single protocol forall situations. Hence, a multi-protocol approach is required. OPCUA has strong backing from Industry 4.0 as the protocol for theIndustrial Internet of Things. Interoperability of OPC UA hasbeen investigated in the context of migration from legacy andwith protocols such as DPWS. Additionally HTTP and CoAPhave been investigated as possible transport mediums.However, OPC UA interoperability has not been investigatedwithin a multi-protocol settings and no generic protocol translationexists. This paper proposes an OPC UA translator followingthe service translator model proposed in the Arrowhead project.Utilizing a mapping to intermediate format, it can be used alongside CoAP, HTTP and MQTT protocols.
31.	Derhamy, Hasan, et al. (författare) System of System Composition based on Decentralized Service Oriented Architecture 2019 Ingår i: IEEE Systems Journal. - : IEEE. - 1932-8184 .- 1937-9234. ; 13:4, s. 3675-3686 Tidskriftsartikel (refereegranskat)abstract As society has progressed through periods of evolution and revolution, technology has played a key role as an enabler. In the same manner, mechanical machines of the 1800s drove the industrial revolution, now digitalized machines are driving another industrial revolution. Manufacturers are increasing the digital footprint on the factory floor. It is challenging to harness the vast amounts of data generated, stored, analyzed, archived, and returned. Data centralization has several well-known challenges, such as collection bottlenecks, secure retrieval, single point of failure, and data scheme fragility as data heterogeneity increases. This paper proposes a method of information distribution based on the principle of data at its source . It proposes that contextual data be used at runtime through the creation of dynamic queries that build compositions of different systems. Such system of systems (SoS) compositions handle the flow of data across its life cycle and present it as information to the initiating system. The proposal starts by creating a graph model of the Arrowhead framework. Then, building on the graph model, the query-based approach for specifying, validating, and forming the SoS is proposed. The proposed graph model allows for unambiguous description of systems and their interrelations, including security relations. The proposed composer operates on the edge computing hardware and gives the production floor the ability to extract information without impacting the overall operation of the factory.
32.	Derhamy, Hasan, et al. (författare) Translation Error Handling for Multi-Protocol SOA Systems 2015 Ingår i: Proceedings of 2015 IEEE 20th International Conference on Emerging Technologies & Factory Automation (ETFA 2015). - Piscataway, NJ : IEEE Communications Society. - 9781467379298 Konferensbidrag (refereegranskat)abstract The IoT research area has evolved to incorporate aplethora of messaging protocol standards, both existing and new,emerging as preferred communications means. The variety ofprotocols and technologies enable IoT to be used in manyapplication scenarios. However, the use of incompatiblecommunication protocols also creates vertical silos and reducesinteroperability between vendors and technology platformproviders. In many applications, it is important that maximuminteroperability is enabled. This can be for reasons such asefficiency, security, end-to-end communication requirements etc.In terms of error handling each protocol has its own methods,but there is a gap for bridging the errors across protocols.Centralized software bus and integrated protocol agents are usedfor integrating different communications protocols.However, the aforementioned approaches do not fit well in allIndustrial IoT application scenarios. This paper thereforeinvestigates error handling challenges for a multi-protocol SOAbasedtranslator. A proof of concept implementation is presentedbased on MQTT and CoAP. Experimental results show thatmulti-protocol error handling is possible and furthermore anumber of areas that need more investigation have beenidentified.
33.	Derhamy, Hasan, et al. (författare) Workflow management for edge driven manufacturing systems 2018 Konferensbidrag (refereegranskat)abstract The fourth industrial revolution is one of digitization. As manufacturers build more digital equipment into their process harnessing the potential becomes a challenge. ISA 95 based manufacturers rely on top down decision making, with redundant flow of information in order to organize Workflows on the factory floor. With advances in edge computing and smart objects, more decision are made at lower levels of the infrastructure hierarchy. However, how can the MES tracking and execution functions be decentralized while maintain an organized collaboration of smart objects? This paper proposes a Cyber Physical Service Oriented System of Systems operating on edge computing. There are three systems proposed here; Smart Product, Workflow Manager and Workflow Executor. These systems operate within Arrowhead Local Clouds and create a fully autonomous set of system to complete a production order. Planning, Supply chain and Quality of Service monitoring are out of scope and remain as centralized activities. The Smart Product is the core Cyber Physical System that must be context-aware in order to pass the correct Workflow information to the Workflow System responsible for current activities.
34.	Ekman, Robin, 1991- (författare) Quantum Kinetic Theory for Plasmas : spin, exchange, and particle dispersive effects 2019 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract This thesis is about developing and studying quantum mechanical models of plasmas. Quantum effects can be important at high densities, at low temperatures, and in strong electromagnetic fields, in various laboratory and astrophysical systems. The focus is on the electron spin, the intrinsic magnetic moment; exchange interactions, a purely quantum mechanical effect arising from particles being indistinguishable; and particle dispersive effects, essentially the Heisenberg uncertainty principle. The focus is on using phase-space formulations of quantum mechanics, namely Wigner and -functions. These methods allow carrying over techniques from classical plasma physics and identifying quantum as opposed to classical behavior.Two new kinetic models including the spin are presented, one fully relativistic and to first order in ħ, and one semi-relativistic but to all orders in ħ. Among other example calculations, for the former, conservation laws for energy, momentum, and angular momentum are derived and related to “hidden momentum” and the Abraham-Minkowski dilemma. Both models are discussed in the context of the existing literature.A kinetic model of exchange interactions, formally similar to a collision operator, is compared to a widely used fluid description based on density functional theory, for the case of electrostatic waves. The models are found to disagree significantly.A new, non-linear, wave damping mechanism is shown to arise from particle dispersive effects. It can be interpreted as the simultaneous absorption or emission of multiple wave quanta. This multi-plasmon damping is of particular interest for highly degenerate electrons, where it can occur on time scales comparable to or shorter than that of linear Landau damping.
35.	Eliasson, Jens, et al. (författare) A bluetooth-based sensor node for low-power ad hoc networks 2008 Ingår i: Journal of Computers. - : International Academy Publishing (IAP). - 1796-203X. ; 3:5, s. 1-10 Tidskriftsartikel (refereegranskat)abstract TCP/IP has recently taken promising steps toward being a viable communication architecture for networked sensor nodes. Furthermore, the use of Bluetooth can enable a wide range of new applications, and in this article, an overview of the performance and characteristics of a networked sensor node based on TCP/IP and Bluetooth is presented. The number of Bluetooth-enabled consumer devices on the market is increasing, which gives Bluetooth an advantage compared to other radio technologies from an interoperability point of view. However, this excellent ability to communicate introduces disadvantages since neither TCP/IP nor Bluetooth were designed with resource-constrained sensor nodes in mind. We, however, argue that the constraints imposed by general purpose protocols and technologies can be greatly reduced by exploiting characteristics of the communication scheme in use and efficient and extensive use of available low-power modes. Furthermore, we claim that a Bluetooth-enabled networked sensor node can achieve an operating lifetime in the range of years using a total volume of less than 10 cm3. The Mulle Embedded Internet System (EIS), along with its advanced power management architecture, is presented as a case-study to support the claims.
36.	Eliasson, Jens, et al. (författare) A Feasibility Study of SOA-enabled Networked Rock Bolts 2014 Ingår i: Proceedings of 2014 IEEE 19th International Conference on Emerging Technologies & Factory Automation (ETFA 2014). - Piscataway, NJ : IEEE Communications Society. - 9781479948451 ; , s. 1-8 Konferensbidrag (refereegranskat)abstract The use of rock bolts in the mining industry is a widely used approach for increasing mine stability. However, when compared to the automation industry, where the use of sensors and real-time monitoring of processes have evolved rapidly, the use rock bolts have not changed a lot during the last 100 years. What is missing are technologies for keeping installed rock bolts under real-time and online monitoring. One problem is that rock bolts can become damaged by seismic activities or movements within the rock, and thus lose their load bearing capacity. If that happens, the outer shell of a tunnel’s walls or ceiling can collapse, with disaster as a result. Therefore, there is a clear need for online and real-time monitoring solutions for strain and thereby stress, as well as seismic activity. In this paper, the current state of art in research around intelligent rock bolts is presented. An intelligent rock bolt is the combination of a traditional rock bolt with an Internet of Things device, i.e. a rock bolt with embedded sensors, actuators, processing capabilities and wireless communication. In the proposed architecture, every rock bolt has its own IPv6 address and can establish a wireless mesh network in an ad-hoc manner. Bymeasuring strain and seismic activity and exposing the sensors in the form of services, large gains in terms of safety and efficiently can be achieved. A number of mining related activities such as stress on the rock bolt can be detected, falling rocks and the presence of mobile machinery can be observed. Since the network is based on standard communication protocols such as IPv6, it is vital to add security mechanisms to prevent eavesdropping and tampering of data traffic. By utilizing the real-time monitoring capabilities of a network of Internet-connected intelligent rock bolt, it is possible to drastically improve monitoring of mining activities and thereby providing workers with a safer working environment.
37.	Eliasson, Jens, et al. (författare) A heterogeneous sensor network architecture for highly mobile users 2011 Ingår i: Proceedings of the Sixth International Conference on Wireless Communication and Sensor Networks. - Piscataway, N.J : IEEE Communications Society. - 9781424497287 Konferensbidrag (refereegranskat)abstract Wireless sensor networks and personal area networks are two relatively new and emerging technologies, capable of addressing a large number of applications such as home automation, medical monitoring, and sports monitoring. This article presents a new sensor network architecture suitable for emerging applications that require a highly mobile group of persons, such as fire fighters or assault teams, to be monitored in real-time. The architecture combines features from WSN, such as mesh routing and efficient communication, with the benefits of using a PAN architecture communicating with standardized Bluetooth profiles and the TCP/IP protocol suite. The use of Bluetooth enables the proposed architecture to use a user's mobile phone in order to achieve Internet connectivity, and IEEE 802.15.4 to create an internal mesh network. This dual-radio approach is necessary since today's mobile phones lack support for radio technologies traditionally utilized by WSNs. Performed tests indicate that the approach can support dependable delivery of sensor data to the Internet from a group of highly mobile users.
38.	Eliasson, Jens, et al. (författare) A power management architecture for sensor nodes 2007 Ingår i: IEEE Wireless Communications & Networking Conference. - Piscataway, NJ : IEEE Communications Society. - 1424406587 ; , s. 3008-3013 Konferensbidrag (refereegranskat)abstract Wireless sensor nodes are a versatile, generalpurpose technology capable of measuring, monitoring and controlling their environment. Even though sensor nodes are becoming ever smaller and more power efficient, there is one area that is not yet fully addressed; Power Supply Units (PSUs). Standard solutions that are efficient enough for electronic devices with higher power consumption than sensor nodes, such as mobile phones or PDAs, may prove to be ill suited for the extreme low-power and size requirements often found on wireless sensor nodes. In this paper, a system-level design of a Power Management Architecture (PMA) is presented. The PMA is an integration of PSU hardware and various software components, and is capable of supplying a sensor node with energy from multiple sources, as well as providing status information from the PSU. The heart of the architecture is a context- and power-aware Task manager, which controls when the nodes low-power modes are activated, and is highly integrated with PSU hardware as well as other software components in the system. Its main responsibility is to schedule when energy consuming tasks can be dispatched. Depending on the task priority and system configuration, a task can be either dispatched, discarded or delayed. This approach ensures that only critical tasks will be allowed to use the battery, and that the system will be powered by renewable energy when performing other non-critical tasks.
39.	Eliasson, Jens, et al. (författare) A SOA-based framework for integration of intelligent rock bolts with internet of things 2013 Ingår i: Proceedings of the IEEE International Conference on Industrial Technology. - Piscataway, NJ : IEEE Communications Society. - 9781467345699 - 9781467345682 ; , s. 1962-1967 Konferensbidrag (refereegranskat)abstract The mining industry is seeing a bright future with a high demand for minerals and relatively high material prices. Much of this is driven by the rapid industrial expansion in countries such as China and others. However, even though the mining business seems promising, there are some important issues that must be addressed in order to maintain a cost-effective and competitive edge. Worker and environment safety, working conditions, are very important issues. Another issue is attracting skilled personal to work in the deep mines of the future.Today, the mining industry has problems hiring personnel, due to hazardous working environments and re-locating to the distant regions. If the workers’ safety could be increased, attracting skilled personnel would become one less problem. Rock bolts and shot-crete are in use today to reinforce tunnel walls, and expensive measurement devices are used in order to monitor seismic activity and rock stress. However, by not having real-time monitoring of rock bolts makes it difﬁcult to monitor them. A better approach would be to make rock bolts intelligent and have them measure stress and seismic activity. Furthermore, by connecting the rock bolts to a network, real-time monitoring of them is made feasible. In this paper, we propose the merger of the Internet of Things (IoT) approach with traditional rock bolts, thereby allowing online monitoring of rock bolt status. This enables an increased possibility to enhance work safety by being able to detect anomalies on the rock earlier, thereby giving workers and machinery an earlier alarm to evacuate hazardous locations in the mine.
40.	Eliasson, Jens, et al. (författare) An ad-hoc bluetooth sensor network for automotive testing 2008 Ingår i: 2008 Consumer Communications and Networking Conference. - Piscataway, NJ : IEEE Communications Society. - 9781424414567 - 9781424414574 ; , s. 179-180 Konferensbidrag (refereegranskat)abstract In this paper, the feasibility of using a sensor network for automotive testing is investigated. Testing is becoming ever more important for the car industry, where the demands for quicker time-to-market and shortened development cycles are increasing. Car testing is time consuming, and is often performed in remote rural areas. Traditional methods include wiring up a vehicle with sensors connected to a data logging device. We envision that the use of wireless sensors can drastically decrease the time required to perform a set of test cases. A sensor network based on Bluetooth was used to validate our design approach. The network supports real-time monitoring of sensor data, and precludes the need of manually configuring each sensor node. Preliminary tests indicates that the proposed design is well suited for vehicle testing, due to its inherent support for ad-hoc networking and auto configuration of services.
41.	Eliasson, Jens, et al. (författare) An internet of things approach for intelligent monitoring of conveyor belt rollers 2013 Ingår i: 10th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2013, CM 2013 and MFPT 2013. - 9781629939926 ; , s. 1096-1104 Konferensbidrag (refereegranskat)
42.	Eliasson, Jens (författare) Intelligent industrial Processes : Big data devices 2014 Rapport (övrigt vetenskapligt/konstnärligt)abstract A versatile and competitive process industry is important for both Sweden's and Europe's future status as new players are emerging. To secure our position, constant improvement and development of industrial processes are required in order to increase productivity while reducing the pressures on the climate and the environment. One key area is ProcessIT (or Process industrial automation) in which several Swedish companies are world leaders in its development, delivery and application.The interest for new technologies such as Internet of Things (IoT), Cyber-Physical Systems (CPS), Big data, and Cloud computing have been increasing rapidly the last years. There have been a number of predictions from some of the world's largest companies in the business of computer communication, such as Cisco, Intel, Ericsson, etc. where the number of Internet connected devices will reach somewhere between 30 and 50 billion devices by the year 2030. This will include traditional devices such as computers and laptops, tablets, smart phones as well as new types of devices such as resource-constrained sensor and actuator platforms.
43.	Eliasson, Jens (författare) Low-power design methodologies for embedded internet systems 2008 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract Embedded systems are resource-constrained special-purpose computers, capable of both sensing and controlling the environment they are placed in. An embedded system usually consists of both hardware and software. The hardware can be composed of sensors, actuators, processors, memory storage devices, communication peripherals, and power supplies. The software typically includes an operating system, device drivers, and an application-specific algorithm for controlling the system's behavior. A special class of embedded systems is comprised by systems that can communicate using standard Internet protocols. Such systems, called Embedded Internet Systems (EIS), are capable of transmitting sensor data directly to the Internet without using specialized gateways. Sensor nodes (nodes in a sensor network) are an example of specialized embedded systems. Sensor nodes with wireless communication capabilities can form a wireless network of sensors. Two types of such networks are usually distinguished - Wireless Sensor Networks (WSN) and Personal Area Networks (PAN). Wireless sensor networks may consist of hundreds or even thousands of sensor nodes; they can be used in industrial applications and deployed in hazardous environments, such as battlefields, volcanos, and forest fires. Personal area networks, on the other hand, are normally composed of a relatively small number of devices, which minimizes requirement on scalability. PAN devices use general-purpose technologies and standard protocols, such as Wi-Fi and Bluetooth, and they are designed for applications such as video and audio streaming, web browsing, and file transfer. Today's research on WSN technology is focused on creating power-efficient large-scale networks using highly specialized protocols and technologies; they are usually intended for scientific, military, and industrial usage scenarios. Research on PAN technology targets consumer needs, where two important requirements are interoperability, through the use of general-purpose technologies and protocols, and usability, often achieved by supporting dynamic address allocation and well-known service discovery protocols. When sensor nodes are used in personal area networks, they should have both features normally characteristic of WSN nodes and those more typical of PAN nodes. A sensor network based on general-purpose technologies should be power-efficient while at the same time enabling interoperability with consumer devices. By using consumer devices, such as mobile phones, and widely available access networks, such as GPRS and UMTS cellular networks, such sensor nodes can achieve worldwide mobility. This is in contrast to traditional wireless sensor networks where the focus is on achieving efficient communication within the network using highly specialized protocols and technologies. This thesis investigates the feasibility of using Embedded Internet Systems as wirelessly networked sensor nodes using standard protocols and commercial off-the-shelf (COTS) components. The focus is on reducing sensor nodes' power consumption while still allowing interoperability with standard consumer devices, such as mobile phones, PDAs, and computers. In other words, the goal is to merge WSN and PAN technologies to produce a new type of wirelessly networked sensor nodes with an operational lifetime in the range of months to years, which communicate using well-known protocols, such as Bluetooth and TCP/IP. Bluetooth was chosen since it is by far the most wide-spread protocol supported by existing consumer devices, and we call the resulting sensor networks Bluetooth Sensor Networks (BSN). BSN nodes are EIS devices used in the context of sensor networks, and the main motivation for this type of sensor networks is to allow sensors, such as GPS, pulse oximeters, and thermometers, to be used in conjunction with standard consumer devices and applications. The work presented in this thesis has resulted in a system architecture which supports sensor networks consisting of EIS devices with a lifetime of several years, energy scavenging capabilities, and user-oriented low-power operation. The use of TCP/IP and Bluetooth enables interoperability with existing infrastructures, such as the Internet, and mobility, when Bluetooth-enabled mobile phones are used as gateways to cellular networks. It has also be demonstrated that it is feasible to utilize Bluetooth and TCP/IP on resource-constrained networked sensor nodes, while still enabling system operational lifetimes in the range of months to years and using a total system volume of less than 10 cm3 .
44.	Eliasson, Jens, et al. (författare) PCB Integration of Dye-sensitised Solar Cells for Internet of Things Applications 2012 Ingår i: International Journal on Advances in Systems and Measurements. - 1942-261X. ; 5:1-2, s. 45-54 Tidskriftsartikel (refereegranskat)abstract Internet of Things is envisioned to drastically chance the way sensor data from physical phenomena can be utilized by users on the Internet. However, one concern in deploying and maintaining a large number of sensor nodes is that replacing spent batteries will not be feasible. One solution to this issue may involve utilising energy harvesting technologies, e.g. solar, heat, or vibration, withsolar being the most promising for general applications. However, using solar panels is currently a relatively expensive approach as they require a time-consuming and therefore costly assembly process. As an alternative, this paper suggests a new approach to powering networked sensors: the direct integration of a solar cell onto a sensor nodes printed circuit board. This approach eliminates the need for manual assembly and the use of expensive connectors.
45.	Eliasson, Jens, et al. (författare) PCB Integration of dye-sensitised solar cells for low-cost networked embedded systems 2011 Ingår i: SENSORCOMM. - 9781612081441 ; , s. 215-222 Konferensbidrag (refereegranskat)abstract Wireless sensor networks are envisioned to make a large impact on how sensor data from physical phenomena can be utilized by millions of users on the Internet. However, one concern in deploying a large number of real-world physical sensors is that replacing spent batteries might not be feasible. One solution to this issue may involve energy harvesting technology, e.g. solar panels. Solar panels are currently relatively expensive because they require a time-consuming and therefore costly assembly process. As an alternative, this paper suggests a new approach to powering networked sensors: the direct integration of a solar cell onto the sensor nodes printed circuit board. This approach eliminates the need for manual assembly and the use of expensive connectors. This article presents test results and a feasibility analysis of the direct integration of a dye-sensitised solar cell onto a circuit board. Preliminary results indicate that this approach is feasible for networked sensors. The aim of this work is to develop a method for the assembly of complete systems, consisting of a printed circuit board, components, and power supply, using a single production process. The first steps towards this aim have been taken, and the authors believe that the proposed approach may be one enabling technology for future large-scale, low-cost wireless sensor networks.
46.	Eliasson, Jens, et al. (författare) Project: Architecture for Service-Oriented Process – Monitoring and Control 2011 Annan publikation (populärvet., debatt m.m.)
47.	Eliasson, Jens, et al. (författare) Project: I2Mine 2013 Annan publikation (populärvet., debatt m.m.)
48.	Eliasson, Jens, et al. (författare) Projekt: Y-programmet 2011 Annan publikation (populärvet., debatt m.m.)
49.	Eliasson, Jens, et al. (författare) Time synchronous bluetooth sensor networks 2006 Ingår i: IEEE Consumer Communications and Networking Conference. - Piscataway, NJ : IEEE Communications Society. - 1424400856 ; , s. 336-340 Konferensbidrag (refereegranskat)abstract Bluetooth-equipped wireless sensor nodes can be quickly integrated in small home networks. These networks can be utilized e.g. for surveillance, home monitoring and automation. Accurate time is an important factor for time-stamping of sensor data, encryption/authentication and it can also to used to implement time synchronous schemes for low power radio communication. We argue that IP-based time synchronization, such as various flavors of the NTP protocol, can be used with Bluetooth networks. This in combination with an activation schedule allows an efficient trade-off between energy consumption and communication delay, and provides easy integration with available infrastructure. The proposed approach in this paper is well suited for smaller wireless home networks, typically singlehop networks with access points that are always available. Our approach is verified by experiments performed on a COTS-based platform using Bluetooth.
50.	Eliasson, Jens, et al. (författare) Towards Industrial Internet of Things : An Efficient and Interoperable Communication Framework 2015 Ingår i: 2015 IEEE International Conference on Industrial Technology, ICIT 2015. - Piscataway, NJ : IEEE Communications Society. - 9781479978007 ; , s. 2198-2204 Konferensbidrag (refereegranskat)abstract Interoperability between shop floor devices and upper layer systems is a key challenge for enabling Internet of Things in industrial applications. Standardized protocols such as IPv6, CoAP, and XML can be used to address this issue. Widely used XML-based technologies such as SenML, EEML, OPC-UA as well as others rely on XML to be able to support a wide range of sensor and actuator applications. However, this approach results in high communication overhead due to the verbose nature of plain text messages encoded in XML. When devices are communicating using 6LoWPAN over IEEE 802.15.4, it is important to keep the messages small enough to fit into one MAC-layer frame to avoid fragmentation and hence conserving bandwidth and transmission energy. One possible solution is to integrate differential binary delta-encoding with a service-based framework based on CoAP, SenML and EXI. The proposed efficient communication approach for service-based architecture can compress a series of events up to 90-95%. The proposed framework is a holistic approach for enabling distributed monitoring and control applications and a move towards realizing the vision of Services of Things.

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