| 1. |
- Ahmed, Mobyen Uddin, 1976-, et al.
(author)
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Run-Time Assurance for the E-care@home System
- 2018
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In: Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 225). - Cham : Springer International Publishing. - 9783319762128 - 9783319762135 ; , s. 107-110
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Conference paper (peer-reviewed)abstract
- This paper presents the design and implementation of the software for a run-time assurance infrastructure in the E-care@home system. An experimental evaluation is conducted to verify that the run-time assurance infrastructure is functioning correctly, and to enable detecting performance degradation in experimental IoT network deployments within the context of E-care@home. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.
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| 2. |
- Bagci, Ibrahim Ethem, et al.
(author)
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Combined Secure Storage and Communication for the Internet of Things
- 2013
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Conference paper (peer-reviewed)abstract
- The future Internet of Things (IoT) may be based on the existing and established Internet Protocol (IP). Many IoT application scenarios will handle sensitive data. However, as security requirements for storage and communication are addressed separately, work such as key management or cryp- tographic processing is duplicated. In this paper we present a framework that allows us to combine secure storage and secure communication in the IP-based IoT. We show how data can be stored securely such that it can be delivered securely upon request without further cryptographic processing. Our prototype implementation shows that combined secure storage and communication can reduce the security-related processing on nodes by up to 71% and energy consumption by up to 32.1%.
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| 3. |
- Dunkels, Adam, et al.
(author)
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Connecting wireless sensornets with TCP/IP Networks
- 2004
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In: Wired/Wireless Internet Communications. - Berlin Heidelberg. - 9783540209546 ; , s. 143-152
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Conference paper (peer-reviewed)abstract
- Wireless sensor networks are based on the collaborative efforts of many small wireless sensor nodes, which collectively are able to form networks through which sensor information can be gathered. Such networks usually cannot operate in complete isolation, but must be connected to an external network through which monitoring and controlling entities can reach the sensornet. As TCP/IP, the Internet protocol suite, has become the de-facto standard for large-scale networking, it is interesting to be able to connect sensornets to TCP/IP networks. In this paper, we discuss three different ways to connect sensor networks with TCP/IP networks: proxy architectures, DTN overlays, and TCP/IP for sensor networks. We conclude that the methods are in some senses orthogonal and that combinations are possible, but that TCP/IP for sensor networks currently has a number of issues that require further research before TCP/IP can be a viable protocol family for sensor networking.
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| 4. |
- Dunkels, Adam, et al.
(author)
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Contiki - a Lightweight and Flexible Operating System for Tiny Networked Sensors
- 2004
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In: Proceedings - Conference on Local Computer Networks, LCN. ; , s. 455-462
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Conference paper (peer-reviewed)abstract
- Wireless sensor networks are composed of large numbers of tiny networked devices that communicate untethered. For large scale networks it is important to be able to dynamically download code into the network. In this paper we present Contiki, a lightweight operating system with support fordynamic loading and replacement of individual programs and services. Contiki is built around an event-driven kernel but provides optional preemptive multi-threading that can be applied to individual processes. We show that dynamic loading and unloading is feasible in a resource constrained environment, while keeping the base system lightweight and compact.
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| 5. |
- Dunkels, Adam, et al.
(author)
-
Making TCP/IP Viable for Wireless Sensor Networks
- 2004. - 1
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Conference paper (peer-reviewed)abstract
- The TCP/IP protocol suite, which has proven itself highly successful in wired networks, is often claimed to be unsuited for wireless micro-sensor networks. In this work, we question this conventional wisdom and present a number of mechanisms that are intended to enable the use of TCP/IP for wireless sensor networks: spatial IP address assignment, shared context header compression, application overlay routing, and distributed TCP caching (DTC). Sensor networks based on TCP/IP have the advantage of being able to directly communicate with an infrastructure consisting either of a wired IP network or of IP-based wireless technology such as GPRS. We have implemented parts of our mechanisms both in a simulator environment and on actual sensor nodes, and preliminary results are promising.
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| 6. |
- Dunkels, Adam, et al.
(author)
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Protothreads : Simplifying Event-Driven Programming of Memory-Constrained Embedded Systems
- 2006
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In: SenSys'06: Proceedings of the Fourth International Conference on Embedded Networked Sensor Systems. - New York, NY, USA : ACM. - 9781595933430 ; , s. 29-42
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Conference paper (peer-reviewed)abstract
- Event-driven programming is a popular model for writing programs for tiny embedded systems and sensor network nodes. While event-driven programming can keep the memory overhead down, it enforces a state machine programming style which makes many programs difficult to write, maintain, and debug. We present a novel programming abstraction called protothreads that makes it possible to write event-driven programs in a thread-like style, with a memory overhead of only two bytes per protothread. We show that protothreads significantly reduce the complexity of a number of widely used programs previously written with event-driven state machines. For the examined programs the majority of the state machines could be entirely removed. In the other cases the number of states and transitions was drastically decreased. With protothreads the number of lines of code was reduced by one third. The execution time overhead of protothreads is on the order of a few processor cycles
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| 7. |
- Dunkels, Adam, et al.
(author)
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Run-Time Dynamic Linking for Reprogramming Wireless Sensor Networks
- 2006
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In: SenSys'06: Proceedings of the Fourth International Conference on Embedded Networked Sensor Systems. - New York, NY, USA : ACM. - 9781595933430 ; , s. 15-28
-
Conference paper (peer-reviewed)abstract
- From experience with wireless sensor networks it has become apparent that dynamic reprogramming of the sensor nodes is a useful feature. The resource constraints in terms of energy, memory, and processing power make sensor network reprogramming a challenging task. Many different mechanisms for reprogramming sensor nodes have been developed ranging from full image replacement to virtual machines.We have implemented an in-situ run-time dynamic linker and loader that use the standard ELF object file format. We show that run-time dynamic linking is an effective method for reprogramming even resource constrained wireless sensor nodes. To evaluate our dynamic linking mechanism we have implemented an application-specific virtual machine and a Java virtual machine and compare the energy cost of the different linking and execution models. We measure the energy consumption and execution time overhead on real hardware to quantify the energy costs for dynamic linkin.Our results suggest that while in general the overhead of a virtual machine is high, a combination of native code and virtual machine code provide good energy efficiency. Dynamic run-time linking can be used to update the native code, even in heterogeneous networks.
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| 8. |
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| 9. |
- Loutfi, Amy, 1978-, et al.
(author)
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Ecare@home : A distributed research environment on semantic interoperability
- 2016
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In: Lect. Notes Inst. Comput. Sci. Soc. Informatics Telecommun. Eng.. - Cham : Springer International Publishing. - 9783319512334 - 9783319512341 ; , s. 3-8
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Conference paper (peer-reviewed)abstract
- This paper presents the motivation and challenges to developing semantic interoperability for an internet of things network that is used in the context of home based care. The paper describes a research environment which examines these challenges and illustrates the motivation through a scenario whereby a network of devices in the home is used to provide high-level information about elderly patients by leveraging from techniques in context awareness, automated reasoning, and configuration planning.
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| 10. |
- Tsiftes, Nicolas, et al.
(author)
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The E-Care@Home Infrastructure for IoT-Enabled Healthcare
- 2016. - 8
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In: Internet of Things Technologies for HealthCare. - Cham : Springer. - 9783319512334 - 9783319512341 ; , s. 138-140
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Conference paper (peer-reviewed)abstract
- The E-Care@Home Project aims at providing a comprehensive IoT-based healthcare system, including state-of-the-art communication protocols and high-level analysis of data from various types of sensors. With this poster, we present its novel technical infrastructure, consisting of low-power IPv6 networking, sensors for health monitoring, and resource-efficient software, that is used to gather data from elderly patients and their surrounding environment.
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