| 1. |
- Carlsson, Marcus, et al.
(author)
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NetSync
- 2000
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Reports (other academic/artistic)abstract
- This paper describes NetSync, a protocol for automation of software updates and log file retrieval on lightweight terminals. It is mainly developed for use in a scientific test environment, but there are other possible uses as well. NetSync is a very flexible protocol, and while designed to be able to be run on handheld units with low storage and computing capacity, it could also be used for high end systems with much storage and computing capacity.
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| 2. |
- Carlsson, Marcus, et al.
(author)
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NetSync client and server
- 2000
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Reports (other academic/artistic)abstract
- This document describes the server and client for the NetSync protocol implemented as part of the networking project course at Lulea University of Technology. The server was implemented as a daemon for the FreeBSD operating system, and the client was implemented for PalmOS
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| 3. |
- Dini, Hoda, 1984-, et al.
(author)
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Optimization and validation of a dislocation density based constitutive model for as-cast Mg-9%Al-1%Zn
- 2018
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In: Materials Science & Engineering. - : Elsevier. - 0921-5093 .- 1873-4936. ; 710, s. 17-26
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Journal article (peer-reviewed)abstract
- A dislocation density-based constitutive model, including effects of microstructure scale and temperature, was calibrated to predict flow stress of an as-cast AZ91D (Mg-9%Al-1%Zn) alloy. Tensile stress-strain data, for strain rates from 10-4 up to 10-1 s-1 and temperatures from room temperature up to 190 °C were used for model calibration. The used model accounts for the interaction of various microstructure features with dislocations and thereby on the plastic properties. It was shown that the Secondary Dendrite Arm Spacing (SDAS) size was appropriate as an initial characteristic microstructural scale input to the model. However, as strain increased the influence of subcells size and total dislocation density dominated the flow stress. The calibrated temperature-dependent parameters were validated through a correlation between microstructure and the physics of the deforming alloy. The model was validated by comparison with dislocation density obtained by using Electron Backscattered Diffraction (EBSD) technique.
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| 4. |
- Grasic, Samo, et al.
(author)
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An Analysis of Evaluation Practices for DTN Routing Protocols
- 2012. - 7
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In: CHANTS '12. - New York, NY, USA : ACM. - 9781450312844 ; , s. 57-65
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Conference paper (peer-reviewed)abstract
- Over the past decade, a lot of research has been done to develop efficient routing protocols for Delay- and Disruption Tolerant Networks (DTNs). In the course of this work, many comparative evaluation studies have been done to determine which of two proposed protocols is the better one (for a given situation). The majority of these evaluations are based on results gained from simulated network environments. In order to conduct a relevant evaluation of routing schemes, numerous conditions, policies and data need to be specified and fed into the simulation environment. The aim of our work in this paper is to discuss current DTN evaluation practices through a thorough and critical literature study. Based on the surveyed material, we show some weaknesses and lack of argumentation used in the evaluations. Through this, we hope to aid in bridging the gap between simulated and real-world DTN environments. In addition, and as a call for further research, we propose a model for evaluation of DTN routing schemes that outlines the most crucial inputs that needs to be considered in the evaluation process. This model is then projected onto evaluation practices used for evaluations of DTN routing protocols in a set of sixteen papers roughly covering a decade of DTN research.
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| 5. |
- Grasic, Samo, et al.
(author)
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Revisiting a remote village scenario and its DTN routing objective
- 2014
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In: Computer Communications. - : Elsevier. - 0140-3664 .- 1873-703X. ; 48, s. 133-140
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Journal article (peer-reviewed)abstract
- Use of opportunistic connectivity together with the delay tolerant network (DTN) architecture provides an economically viable alternative to traditional ICT solutions for communication challenged areas. Here, the remote village scenario is commonly established as a motive in terrestrial DTN research. However, the majority of the DTN research does not discuss the remote village scenario as a concept at any length. Instead, urban scenarios are employed, both as benchmarks and as target scenarios. This can be a problem as it does not take into account the specific characteristics of a concrete real-world remote village scenario. In this paper we discuss how these characteristics affect and shape the deployment of network and the network itself. Furthermore, we show how these network conditions forced us to change the focus from the traditional DTN routing objective forwarding problem to the traffic queuing problem. Finally, we discuss how the characteristics seen in the case study of one remote village can be generalized for other remote village scenarios. All material and observations used in this paper are drawn from our 5 years experiences of DTN deployments in remote mountainous villages of Sweden.
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| 6. |
- Grasic, Samo, et al.
(author)
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The evolution of a DTN routing protocol : PRoPHETv2
- 2011
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In: CHANTS '11. - New York : ACM Digital Library. - 9781450308700 ; , s. 27-30
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Conference paper (peer-reviewed)abstract
- Research within Delay- and Disruption Tolerant Networks (DTN) has evolved into a mature research area. PRoPHET is a routing protocol for DTNs that was developed when DTN research was in its infancy and which has been studied by many. In this paper we investigate how the protocol can evolve to meet new challenges that has been identified through research and practical experience. We propose some minor modifications to the routing metric calculations done in PRoPHET which has potential to alleviate some issues and improve the performance of the protocol. Using these modifications, we define an updated version of the protocol called PRoPHETv2. We run simulations to verify the operation of the protocol and compare its performance against the original version of the protocol as well as some other routing protocols. The evaluations are done using both traces from an existing DTN deployment and a synthetic mobility model. Since the basic mechanisms of the protocol remain the same, migrating existing implementations to the new version of PRoPHET is possible with limited effort.
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| 7. |
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| 8. |
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| 9. |
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| 10. |
- Leguay, Jeremie, et al.
(author)
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Opportunistic content distribution in an urban setting
- 2006
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In: Proceedings of the ACM SIGCOMM 2006 Workshops. - New York : ACM Digital Library. - 159593572X ; , s. 205-212
-
Conference paper (peer-reviewed)abstract
- This paper investigates the feasibility of a city-wide content distribution architecture composed of short range wireless access points. We look at how a target group of intermittently and partially connected mobile nodes can improve the diffusion of information within the group by leveraging fixed and mobile nodes that are exterior to the group. The fixed nodes are data sources, and the external mobile nodes are data relays, and we examine the trade off between the use of each in order to obtain high satisfaction within the target group, which consists of data sinks. We conducted an experiment in Cambridge, UK, to gather mobility traces that we used for the study of this content distribution architecture
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