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1.	Larsson, Marcus, 1979-, et al. (författare) Curvature based Antenna Selection Method Evaluated Using the Data Age Metric and V2V Measurements 2015 Ingår i: 2015 IEEE International Conference on Communication Workshop (ICCW). - Piscataway, NJ : IEEE Press. - 9781467363051 ; , s. 2356-2362 Konferensbidrag (refereegranskat)abstract In this paper, we compare a method for selecting transmission antenna based on road curvature to a method based on periodically alternating between left and right hand side transmission antennas. Both methods aim to improve the success rate for communication between participants in a platoon of vehicles. Moreover, we propose the data age metric for online use as input to the algorithm controlling the inter-vehicle distance in platooning, e.g. to decide appropriate gap between the vehicles depending on the V2V communication quality. The methods have been evaluated through V2V communication measurements performed using heavy duty vehicles on public highway. We show that, when using the curvature-based method, a 150 ms data age deadline is only missed approximately half as often compared to when periodically alternating between left and right hand side transmission antennas. The methods have also been compared for different antenna combinations. © 2015 IEEE
2.	Allgayer, Rodrigo, et al. (författare) Analysis of distributed control system using remote method invocation in wireless network 2011 Ingår i: IECON 2011 Proceedings. - New York : IEEE. - 9781612849720 ; , s. 346-351 Konferensbidrag (refereegranskat)abstract This work presents the temporal analysis for a distributed differential control system for a mobile robot deployed on a wireless network using the SunSPOT platform. The system is programmed in Java and each of its part is executed in a distinct processor which cooperates via a wireless network. The communication between the network nodes is made by remote procedure calls, which are implemented by a minimum version of the Java RMI (mRMI), presented in this work. Simulation results are compared to experimental data acquired by the deployment of the system on real devices, the SunSPOTs. The comparisons reveal that the distributed solution presents fairly good results besides the inserted errors due to the wireless communication. © 2011 IEEE.
3.	Aramrattana, Maytheewat, 1988-, et al. (författare) A Novel Risk Indicator for Cut-In Situations 2020 Ingår i: 2020 IEEE 23rd International Conference on Intelligent Transportation Systems, ITSC 2020. - Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc.. - 9781728141497 - 9781728141503 Konferensbidrag (refereegranskat)abstract Cut-in situations occurs when a vehicle intentionally changes lane and ends up in front of another vehicle or in-between two vehicles. In such situations, having a method to indicate the collision risk prior to making the cut-in maneuver could potentially reduce the number of sideswipe and rear end collisions caused by the cut-in maneuvers. This paper propose a new risk indicator, namely cut-in risk indicator (CRI), as a way to indicate and potentially foresee collision risks in cut-in situations. As an example use case, we applied CRI on data from a driving simulation experiment involving a manually driven vehicle and an automated platoon in a highway merging situation. We then compared the results with time-to-collision (TTC), and suggest that CRI could correctly indicate collision risks in a more effective way. CRI can be computed on all vehicles involved in the cut-in situations, not only for the vehicle that is cutting in. Making it possible for other vehicles to estimate the collision risk, for example if a cut-in from another vehicle occurs, the surrounding vehicles could be warned and have the possibility to react in order to potentially avoid or mitigate accidents.
4.	Aramrattana, Maytheewat, 1988- (författare) A Simulation-Based Safety Analysis of CACC-Enabled Highway Platooning 2018 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract Cooperative Intelligent Transport Systems (C-ITS) enable actors in the transport systems to interact and collaborate by exchanging information via wireless communication networks. There are several challenges to overcome before they can be implemented and deployed on public roads. Among the most important challenges are testing and evaluation in order to ensure the safety of C-ITS applications.This thesis focuses on testing and evaluation of C-ITS applications with regard to their safety using simulation. The main focus is on one C-ITS application, namely platooning, that is enabled by the Cooperative Adaptive Cruise Control (CACC) function. Therefore, this thesis considers two main topics: i) what should be modelled and simulated for testing and evaluation of C-ITS applications? and ii) how should CACC functions be evaluated in order to ensure safety?When C-ITS applications are deployed, we can expect traffic situations which consist of vehicles with different capabilities, in terms of automation and connectivity. We propose that involving human drivers in testing and evaluation is important in such mixed traffic situations. Considering important aspects of C-ITS including human drivers, we propose a simulation framework, which combines driving-, network-, and traffic simulators. The simulation framework has been validated by demonstrating several use cases in the scope of platooning. In particular, it is used to demonstrate and analyse the safety of platooning applications in cut-in situations, where a vehicle driven by a human driver cuts in between vehicles in platoon. To assess the situations, time-to-collision (TTC) and its extensions are used as safety indicators in the analyses.The simulation framework permits future C-ITS research in other fields such as human factors by involving human drivers in a C-ITS context. Results from the safety analyses show that cut-in situations are not always hazardous, and two factors that are the most highly correlated to the collisions are relative speed and distance between vehicles at the moment of cutting in. Moreover, we suggest that to solely rely on CACC functions is not sufficient to handle cut-in situations. Therefore, guidelines and standards are required to address these situations properly.
5.	Aramrattana, Maytheewat, et al. (författare) A simulation framework for cooperative intelligent transport systems testing and evaluation 2017 Ingår i: Transportation Research Part F. - Kidlington : Pergamon Press. - 1369-8478 .- 1873-5517. Tidskriftsartikel (refereegranskat)abstract Connected and automated driving in the context of cooperative intelligent transport systems (C-ITS) is an emerging area in transport systems research. Interaction and cooperation between actors in transport systems are now enabled by the connectivity by means of vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. To ensure the goals of C-ITS, which are safer and more efficient transport systems, testing and evaluation are required before deployment of C-ITS applications. Therefore, this paper presents a simulation framework—consisting of driving-, traffic-, and network-simulators—for testing and evaluation of C-ITS applications. Examples of cooperative adaptive cruise control (CACC) applications are presented, and are used as test cases for the simulation framework as well as to elaborate on potential use cases of it. Challenges from combining the simulators into one framework, and limitations are reported and discussed. Finally, the paper concludes with future development directions, and applications of the simulation framework in testing and evaluation of C-ITS. © 2017 Elsevier Ltd. All rights reserved.
6.	Aramrattana, Maytheewat, et al. (författare) A Simulation Study on Effects of Platooning Gaps on Drivers of Conventional Vehicles in Highway Merging Situations 2021 Ingår i: IEEE transactions on intelligent transportation systems (Print). - Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc.. - 1524-9050 .- 1558-0016. Tidskriftsartikel (refereegranskat)abstract Platooning refers to a group of vehicles that--enabled by wireless vehicle-to-vehicle (V2V) communication and vehicle automation--drives with short inter-vehicular distances. Before its deployment on public roads, several challenging traffic situations need to be handled. Among the challenges are cut-in situations, where a conventional vehicle--a vehicle that has no automation or V2V communication--changes lane and ends up between vehicles in a platoon. This paper presents results from a simulation study of a scenario, where a conventional vehicle, approaching from an on-ramp, merges into a platoon of five cars on a highway. We created the scenario with four platooning gaps: 15, 22.5, 30, and 42.5 meters. During the study, the conventional vehicle was driven by 37 test persons, who experienced all the platooning gaps using a driving simulator. The participants' opinions towards safety, comfort, and ease of driving between the platoon in each gap setting were also collected through a questionnaire. The results suggest that a 15-meter gap prevents most participants from cutting in, while causing potentially dangerous maneuvers and collisions when cut-in occurs. A platooning gap of at least 30 meters yield positive opinions from the participants, and facilitating more smooth cut-in maneuvers while less collisions were observed.
7.	Aramrattana, Maytheewat, et al. (författare) Cooperative Driving Simulation 2016 Ingår i: Proceedings of the Driving Simulation Conference 2016. ; , s. 123-132 Konferensbidrag (refereegranskat)abstract For a few decades, driving simulators have been supporting research and development of advanced driver assistance systems (ADAS). In the near future, connected vehicles are expected to be deployed. Driving simulators will need to support evaluation of cooperative driving applications within cooperative intelligent transportation systems (C-ITS) scenarios. C-ITS utilize vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. Simulation of the inter vehicle communication is often not supported in driving simulators. On the other hand, previous efforts have been made to connect network simulators and traffic simulators, to perform C-ITS simulations. Nevertheless, interactions between actors in the system is an essential aspect of C-ITS. Driving simulators can provide the opportunity to study interactions and reactions of human drivers to the system. This paper present simulation of a C-ITS scenario using a combination of driving, network, and traffic simulators. The architecture of the solution and important challenges of the integration are presented. A scenario from Grand Cooperative Driving Challenge (GCDC) 2016 is implemented in the simulator as an example use case. Lastly, potential usages and future developments are discussed.
8.	Aramrattana, Maytheewat, et al. (författare) Dimensions of cooperative driving, ITS and automation 2015 Ingår i: IEEE Intelligent Vehicles Symposium, Proceedings. - Piscataway, NJ : IEEE Press. - 9781467372664 ; , s. 144-149 Konferensbidrag (refereegranskat)abstract Wireless technology supporting vehicle-to-vehicle (V2V), and vehicle-to-infrastructure (V2I) communication, allow vehicles and infrastructures to exchange information, and cooperate. Cooperation among the actors in an intelligent transport system (ITS) can introduce several benefits, for instance, increase safety, comfort, efficiency.Automation has also evolved in vehicle control and active safety functions. Combining cooperation and automation would enable more advanced functions such as automated highway merge and negotiating right-of-way in a cooperative intersection. However, the combination have influences on the structure of the overall transport systems as well as on its behaviour. In order to provide a common understanding of such systems, this paper presents an analysis of cooperative ITS (C-ITS) with regard to dimensions of cooperation. It also presents possible influence on driving behaviour and challenges in deployment and automation of C-ITS.
9.	Aramrattana, Maytheewat, et al. (författare) Extended Driving Simulator for Evaluation of Cooperative Intelligent Transport Systems 2016 Ingår i: Proceedings of the 2016 annual ACM Conference on SIGSIM Principles of Advanced Discrete Simulation (SIGSIM-PADS '16). - New York, NY, USA : ACM Digital Library. - 9781450337427 ; , s. 255-258 Konferensbidrag (refereegranskat)abstract Vehicles in cooperative intelligent transport systems (C-ITS) often need to interact with each other in order to achieve their goals, safe and efficient transport services. Since human drivers are still expected to be involved in C-ITS, driving simulators are appropriate tools for evaluation of the C-ITS functions. However, driving simulators often simplify the interactions or influences from the ego vehicle on the traffic. Moreover, they normally do not support vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication, which is the main enabler for C-ITS. Therefore, to increase the C-ITS evaluation capability, a solution on how to extend a driving simulator with traffic and network simulators to handle cooperative systems is presented as a result of this paper. Evaluation of the result using two use cases is presented. And, the observed limitations and challenges of the solution are reported and discussed.
10.	Aramrattana, Maytheewat, et al. (författare) Safety Analysis of Cooperative Adaptive Cruise Control in Vehicle Cut-in Situations 2017 Ingår i: Proceedings of 2017 4th International Symposium on Future Active Safety Technology towards Zero-Traffic-Accidents (FAST-zero). - : Society of Automotive Engineers of Japan. Konferensbidrag (refereegranskat)abstract Cooperative adaptive cruise control (CACC) is a cooperative intelligent transport systems (C-ITS) function, which especially when used in platooning applications, possess many expected benefits including efficient road space utilization and reduced fuel consumption. Cut-in manoeuvres in platoons can potentially reduce those benefits, and are not desired from a safety point of view. Unfortunately, in realistic traffic scenarios, cut-in manoeuvres can be expected, especially from non-connected vehicles. In this paper two different controllers for platooning are explored, aiming at maintaining the safety of the platoon while a vehicle is cutting in from the adjacent lane. A realistic scenario, where a human driver performs the cut-in manoeuvre is used to demonstrate the effectiveness of the controllers. Safety analysis of CACC controllers using time to collision (TTC) under such situation is presented. The analysis using TTC indicate that, although potential risks are always high in CACC applications such as platooning due to the small inter-vehicular distances, dangerous TTC (TTC < 6 seconds) is not frequent. Future research directions are also discussed along with the results.
11.	Aramrattana, Maytheewat, 1988-, et al. (författare) Safety Evaluation of Highway Platooning Under a Cut-In Situation Using Simulation Annan publikation (populärvet., debatt m.m.)abstract Platooning refers to an application, where a group of connected and automated vehicles follow a lead vehicle autonomously, with short inter-vehicular distances. At merging points on highways such as on-ramp, platoons could encounter manually driven vehicles, which are merging on to the highways. In some situations, the manually driven vehicles could end up between the platooning vehicles. Such situations are expected and known as “cut-in” situations. This paper presents a simulation study of a cut-in situation, where a platoon of five vehicles encounter a manually driven vehicle at a merging point of a highway. The manually driven vehicle is driven by 37 test persons using a driving simulator. For the platooning vehicles, two longitudinal controllers with four gap settings between the platooning vehicles, i.e. 15 meters, 22.5 meters, 30 meters, and 42.5 meters, are evaluated. Results summarizing cut-in behaviours and how the participants perceived the situation are presented. Furthermore, the situation is assessed using safety indicators based on time-to-collision.
12.	Aramrattana, Maytheewat, 1988-, et al. (författare) Simulation of cut-in by manually driven vehicles in platooning scenarios 2017 Ingår i: IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC. - Piscataway, NJ : IEEE. - 9781538615256 - 9781538615263 - 9781538615270 Konferensbidrag (refereegranskat)abstract In the near future, Cooperative Intelligent Transport System (C-ITS) applications are expected to be deployed. To support this, simulation is often used to design and evaluate the applications during the early development phases. Simulations of C-ITS scenarios often assume a fleet of homogeneous vehicles within the transportation system. In contrast, once C-ITS is deployed, the traffic scenarios will consist of a mixture of connected and non-connected vehicles, which, in addition, can be driven manually or automatically. Such mixed cases are rarely analysed, especially those where manually driven vehicles are involved. Therefore, this paper presents a C-ITS simulation framework, which incorporates a manually driven car through a driving simulator interacting with a traffic simulator, and a communication simulator, which together enable modelling and analysis of C-ITS applications and scenarios. Furthermore, example usages in the scenarios, where a manually driven vehicle cut-in to a platoon of Cooperative Adaptive Cruise Control (CACC) equipped vehicles are presented.
13.	Aramrattana, Maytheewat, 1988-, et al. (författare) Team Halmstad Approach to Cooperative Driving in the Grand Cooperative Driving Challenge 2016 2018 Ingår i: IEEE transactions on intelligent transportation systems (Print). - Piscataway, N.J. : Institute of Electrical and Electronics Engineers Inc.. - 1524-9050 .- 1558-0016. ; 19:4, s. 1248-1261 Tidskriftsartikel (refereegranskat)abstract This paper is an experience report of team Halmstad from the participation in a competition organised by the i-GAME project, the Grand Cooperative Driving Challenge 2016. The competition was held in Helmond, The Netherlands, during the last weekend of May 2016. We give an overview of our car’s control and communication system that was developed for the competition following the requirements and specifications of the i-GAME project. In particular, we describe our implementation of cooperative adaptive cruise control, our solution to the communication and logging requirements, as well as the high level decision making support. For the actual competition we did not manage to completely reach all of the goals set out by the organizers as well as ourselves. However, this did not prevent us from outperforming the competition. Moreover, the competition allowed us to collect data for further evaluation of our solutions to cooperative driving. Thus, we discuss what we believe were the strong points of our system, and discuss post-competition evaluation of the developments that were not fully integrated into our system during competition time. © 2000-2011 IEEE.
14.	Binotto, Alécio Pedro Delazari, et al. (författare) Towards Dynamic Task Scheduling and Reconfiguration using an Aspect Oriented Approach applied on Real-time concerns of Industrial Systems 2009 Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - Frankfurt : Elsevier. - 1474-6670. ; 13:PART 1, s. 1423-1428 Tidskriftsartikel (refereegranskat)abstract High performance computational platforms are required by industries that make use of automatic methods to manage modern machines, which are mostly controlled by high-performance specific hardware with processing capabilities. It usually works together with CPUs, forming a powerful execution platform. On an industrial production line, distinct tasks can be assigned to be processed by different machines depending on certain conditions and production parameters. However, these conditions can change at run-time influenced mainly by machine failure and maintenance, priorities changes, and possible new better task distribution. Therefore, self-adaptive computing is a potential paradigm as it can provide flexibility to explore the machine resources and improve performance on different execution scenarios of the production line. One approach is to explore scheduling and run-time task migration among machines’ hardware towards a balancing of tasks, aiming performance and production gain. This way, the monitoring of time requirements and its crosscutting behaviour play an important role for task (re)allocation decisions. This paper introduces the use of software aspect-oriented paradigms to perform machines’ monitoring and a self-rescheduling strategy of tasks to address nonfunctional timing constraints. As case study, tasks for a production line of aluminium ingots are designed. © 2009 IFAC.
15.	Binotto, Alécio P. D., et al. (författare) Towards task dynamic reconfiguration over asymmetric computing platforms for UAVs surveillance systems 2009 Ingår i: Scalable computing. - Timisoara : Universitatea de Vest din Timisoara / West University of Timisoara. - 1895-1767. ; 10:3, s. 277-289 Tidskriftsartikel (refereegranskat)abstract High-performance platforms are required by modern applications that make use of massive calculations. Actually, low-cost and high-performance specific hardware (e.g. GPU) can be a good alternative along with CPUs, which turned to multiple cores, forming powerful heterogeneous desktop execution platforms. Therefore, self-adaptive computing is a promising paradigm as it can provide flexibility to explore different computing resources, on which heterogeneous cluster can be created to improve performance on different execution scenarios. One approach is to explore run-time tasks migration among node's hardware towards an optimal system load-balancing aiming at performance gains. This way, time requirements and its crosscutting behavior play an important role for task (re)allocation decisions. This paper presents a self-rescheduling task strategy that makes use of aspect-oriented paradigms to address non-functional application timing constraints from earlier design phases. A case study exploring Radar Image Processing tasks is presented to demonstrate the proposed approach. Simulations results for this case study are provided in the context of a surveillance system based on Unmanned Aerial Vehicles (UAVs). © 2009 SCPE.
16.	de Freitas, Edison Pignaton, 1979-, et al. (författare) Evaluation of coordination strategies for heterogeneous sensor networks aiming at surveillance applications 2009 Ingår i: Sensors 2009 New Zealand. - Piscataway, N.J. : IEEE Press. - 9781424445486 - 9781424453351 ; , s. 591-596 Konferensbidrag (refereegranskat)abstract A new challenge in the sensor network area is the coordination of heterogeneous sensors (with different sensing, mobility and computing capabilities) in an integrated network. This kind of sensor networks have clearly high relevance in surveillance systems, in which both low-end static ground sensor nodes and more sophisticated sensors carried by mobile platforms, such as Unmanned Aerial Vehicles (UAVs), cooperate. This paper provides an analysis of two different strategies to guide the collaboration among the sensor nodes mentioned above, applied to area surveillance systems. The first analyzed problem is related to the choice of the UAV instance that will respond to a given alarm issued by a ground sensor node. The second issue is the estimation of the response time until any UAV can be engaged in handling an alarm and effectively handles it. Two strategies are introduced and compared: one based on a pheromone inspired approach and another based on utility functions inspired on risk profiles that models decisions of investors in the stock market. ©2009 IEEE.
17.	de Freitas, Edison Pignaton, 1979-, et al. (författare) Middleware Support in Unmanned Aerial Vehicles and Wireless Sensor Networks for Surveillance Applications 2009 Ingår i: Intelligent Distributed Computing III. - Berlin/Heidelberg : Springer Berlin/Heidelberg. - 9783642032134 ; , s. 289-296 Konferensbidrag (refereegranskat)abstract This paper presents the architecture of a middleware that provides an intelligent interoperability support to allow the integration and cooperation among Wireless Sensor Network (WSN) nodes and small Unmanned Aerial Vehicles (UAVs) implementing a surveillance system. The motivation for this study is that the cooperation among distinct types of sensor nodes to achieve common goals can notably enhance the results obtained in surveillance operations. A discussion around the requirements of such systems is also presented, supporting the design decisions and the choice of the techniques employed to develop the middleware. Finally, preliminary results are presented.
18.	de Freitas, Edison Pignaton, et al. (författare) Mobile Agents Model and Performance Analysis of a Wireless Sensor Network Target Tracking Application 2011 Ingår i: Smart spaces and next generation wired/wireless networking. - Heidelberg : Springer Berlin/Heidelberg. - 9783642228742 - 3642228747 ; , s. 274-286 Konferensbidrag (refereegranskat)abstract Advances on wireless communication and sensor systems enabled the growing usage of Wireless Sensor Networks. This kind of network is being used to support a number of new emerging applications, thus the importance in studying the efficiency of new approaches to program them. This paper proposes a performance study of an application using high-level mobile agent model for Wireless Sensor Networks. The analysis is based on a mobile object tracking system, a classical WSN application. It is assumed that the sensor nodes are static, while the developed software is implemented as mobile agents by using the AFME framework. The presented project follows a Model-Driven Development (MDD) methodology using UML (Unified Modeling Language) models. Metrics related to dynamic features of the implemented solution are extracted from the deployed application, allowing a design space exploration in terms of metrics such as performance, memory and energy consumption. © Springer-Verlag Berlin Heidelberg 2011.
19.	Heimfarth, Tales, et al. (författare) Middleware Support for Wireless Sensor Networks : A survey 2010 Ingår i: Handbook of Research on Developments and Trends in Wireless Sensor Networks. - Hershey, PA : Information Science Reference. - 9781615207015 - 1615207015 - 9781615207022 ; , s. 235-260 Bokkapitel (refereegranskat)abstract Wireless sensor networks (WSNs) are gaining visibility due to several sophisticated applications in which they play a key role, such as in pervasive computing and context-aware systems. However, the evolution of WSN capabilities, especially regarding their ability to provide information, brings complexity to their development, in particular for those application developers that are not familiar with the technology underlying and needed to support WSNs. In order to address this issue and allow the use of the full potential of the sensor network capabilities, the use of a middleware that raises the abstraction level and hides much of the WSN complexity is a promising proposal. However, the development of a middleware for WSNs is not an easy task. Systems based on WSNs have several issues that make them quite different from conventional networked computer systems, thus requiring specific approaches that largely differ from the current solutions. The proposal of this chapter is to address the complexity of middleware made for sensor networks, presenting a taxonomy that characterizes the main issues in the field. An overview of the state-of-the-art is also provided, as well as a critical assessment of existing approaches. © 2010, IGI Global.
20.	Khan, Zeshan Aslam, et al. (författare) A Multi-agent Model for Fire Detection in Coal Mines using Wireless Sensor Networks 2013 Ingår i: 2013 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications. - Los Alamitos, CA : IEEE Computer Society. - 9780769550220 ; , s. 1754-1761 Konferensbidrag (refereegranskat)abstract This paper presents an application for monitoring and detection of fire in coal mines using wireless sensor networks (WSNs). The application uses BDI (Belief, Desire and Intention) based multi-agent model and its implementation on sensor networks. The language used for implementation is interpreted by Jason; an extension of AgentSpeak which is based on the BDI Architecture. The BDI agents are reactive planning systems; systems that are not meant to compute the value of a function and terminate but rather designed to be permanently running and reacting to some form of event. The distributed model of the environment is adopted to overcome the communication overhead, power consumption, network delay and reliability on a centralized base station. © 2013 IEEE.
21.	Lampoltshammer, Thomas J., et al. (författare) Use of Local Intelligence to Reduce Energy Consumption of Wireless Sensor Nodes in Elderly Health Monitoring Systems 2014 Ingår i: Sensors. - Basel : Multidisciplinary Digital Publishing Institute. - 1424-8220. ; 14:3, s. 4932-4947 Tidskriftsartikel (refereegranskat)abstract The percentage of elderly people in European countries is increasing. Such conjuncture affects socio-economic structures and creates demands for resourceful solutions, such as Ambient Assisted Living (AAL), which is a possible methodology to foster health care for elderly people. In this context, sensor-based devices play a leading role in surveying, e.g., health conditions of elderly people, to alert care personnel in case of an incident. However, the adoption of such devices strongly depends on the comfort of wearing the devices. In most cases, the bottleneck is the battery lifetime, which impacts the effectiveness of the system. In this paper we propose an approach to reduce the energy consumption of sensors’ by use of local sensors’ intelligence. By increasing the intelligence of the sensor node, a substantial decrease in the necessary communication payload can be achieved. The results show a significant potential to preserve energy and decrease the actual size of the sensor device units. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
22.	Larsson, Tony, 1950-, et al. (författare) Cooperative partly automated and coordinated vehicles and transports 2014 Konferensbidrag (refereegranskat)abstract Automation of vehicles and transports is rapidly evolving from a vision to reality due to systems for local situation awareness relying on advanced on-board vehicle sensors and software implemented intelligence. This evolution will be further supported by the capability to communicate and cooperate between vehicles and with important infrastructure to coordinate the traffic for both safe and environmentally efficient transports. To become accepted among vehicle drivers and other citizens this will require understanding of the problems involved and suitable methods to cope with these problems. This paper identifies some of the problems seen and methods needed.
23.	Larsson, Tony, 1950-, et al. (författare) System and Method for Dynamic Sharing of Connection Resources 1997 Patent (populärvet., debatt m.m.)abstract A system and method for the efficient utilization of core telecommunications resources (including both switching and transport resources) during a datacom session over a connection-oriented telecommunications system is described. First, the telecommunications resources along a connection path are partitioned into two or more segments. One or more pause sensors placed along the connection path detect periods of inactivity in an connection. Whenever such a period of inactivity is detected, the pause sensor selectively causes the release of core telecommunications resources for reallocation to active applications, typically by deactivating one or more segments. When wake-up sensors detect renewed activity over the connection, then the dormant connection is reactivated by reallocating core physical resources. The dynamic connection technique of the present invention can be used both with analog (inband) signaling systems (e.g., Plain Old Telephone Service) as well as with digital signaling systems (e.g., Integrated Services Digital Network). The deactivation and reactivation of core telecommunications resources can be performed using various priority schemes.
24.	Larsson, Tony, 1950- (författare) System and method for dynamic sharing of core connection resources 1998 Patent (populärvet., debatt m.m.)abstract A system and method for the efficient utilization of core telecommunications resources (including both switching and transport resources) during a datacom session over a connection-oriented telecommunications system is described. First, the telecommunications resources along a connection path are partitioned into two or more segments. One or more pause sensors (550) placed along the connection path detect periods of inactivity in a connection. Whenever such a period of inactivity is detected, the pause sensor (550) selectively causes the release of core telecommunications resources for reallocation to active applications, typically by deactivating one or more segments. When wake-up sensors (520, 550) detect renewed activity over the connection, then the dormant connection is reactivated by reallocating core physical resources. The dynamic connection technique of the present invention can be used both with analog (inband) signaling systems (e.g., Plan Old Telephone Service) as well as with digital signaling systems (e.g., Integrated Services Digital Network). The deactivation and reactivation of core telecommunications resources can be performed using various priority schemes.
25.	Larsson, Tony, 1950- (författare) System and method for reducing coupling between modules in a telecommunications environment 1997 Patent (populärvet., debatt m.m.)abstract A technique for enhancing the modifiability and reuse of telecommunications software systems is described. The problem domain is first partitioned into tasks that are assigned to distinct software program modules. In one embodiment, each of the software modules have multiple output ports. Each output port provides a mechanism to link the software module to a specific version of a different program module. The multiple output ports are used to selectively link the module to one of several versions of a different program module. The linking is performed as early as system design time or as late as run-time, or at any intermediate time between the two. The use of output ports makes software modules less dependent on each other and also simplifies the "hot-swapping" or dynamic replacement of one module by another at run-time. In an alternative embodiment, each of the software modules has a unitary output port where each output port comprises an array of linking records. Each linking record has as many linking variables as there are versions of the receiving module.
26.	Larsson, Tony, 1950- (författare) System and method for reducing coupling between modules in a telecommunications environment 1998 Patent (populärvet., debatt m.m.)abstract A technique for enhancing the modifiability and reuse of telecommunications software systems is described. The problem domain is first partitioned into tasks that are assigned to distinct software program modules (901, 902). In one embodiment, each of the software modules (901, 902) have multiple output ports (911, 912). Each output port (911, 912) provides a mechanism to link the software module (901, 902) to a specific version of a different program module (903, 904). The multiple output ports are used to selectively link the module to one of several versions of a different program module. The linking is performed as early as system design time or as late as run-time, or at any intermediate time between the two. The use of output ports makes software modules less dependent on each other and also simplifies the 'hot-swapping' or dynamic replacement of one module by another at run-time. In an alternative embodiment, each of the software modules (800) has a unitary output port (802) where each output port comprises an array of linking records. Each linking record has as many linking variables as there are versions of the receiving module.
27.	Larsson, Tony, 1950- (författare) System and method for reducing coupling in an object-oriented programming environment 1999 Patent (populärvet., debatt m.m.)abstract The principal impediment to achieving interoperability, modifiability, implementation-independence and the reuse of object-oriented software components is the strong coupling between objects. The preferred solution to this problem involves adding an output port to each object and further making this additional output port part of a new software development approach that is an extension of the object-orientation paradigm. The resulting component-oriented software development environment provides the level of indirect addressing that is needed to manage the design requirements of interoperability, modifiability and implementation-independency. Another solution to the decoupling problem includes requiring each object to address other objects only indirectly, such as by using specific interface objects. Several variants of this technique have been detailed, described and compared in this patent application. Each of these techniques may be applied in different parts, or at different levels, of a software system.
28.	Larsson, Tony, 1950- (författare) System and method for reducing coupling in an object-oriented programming environment 1997 Patent (populärvet., debatt m.m.)abstract The principal impediment to achieving interoperability, modifiability, implementation-independence and the reuse of object-oriented software components is the strong coupling between objects. The preferred solution to this problem involves adding an output port to each object and further making this additional output port part of a new software development approach that is an extension of the object-orientation paradigm. The resulting component-oriented software development environment provides the level of indirect addressing that is needed to manage the design requirements of interoperability, modifiability and implementation-independency. The approach described is superior to the component-oriented approach used in some of the Microsoft Corporation's software applications and the applet approach recently advocated for the Java programming language. Another solution to the decoupling problem includes requiring each object to address other objects only indirectly, such as by using specific interface objects. Several variants of this technique have been detailed, described and compared in this patent application. Each of these techniques may be applied in different parts, or at different levels, of a software system.
29.	Larsson, Tony, 1950- (författare) Telecommunication Exchange Evolution 2017 Ingår i: Wiley Encyclopedia of Electrical and Electronics Engineering. - New York : John Wiley & Sons. - 9780471346081 ; , s. 1-16 Bokkapitel (refereegranskat)abstract To telecommunicate means to communicate over distance. The information that is communicated can be of many different forms. Communication over distance has been performed in many different ways if we look back in history, e.g. via drums, fire, telegraph, telephone and more recently also via various computer terminals. This article focuses on the telecommunication exchange development and evolution that for long was driven by the voice communication via telephone sets but that now involves also many other kinds of information carrying medias and the related encoding of the media and thus information. To make the communications economically attractive network topologies have been built to efficiently allow the sharing of physical resources along the paths between communicating parties with access to the network. These resources for example including cables, switches, routers, media translators and radio stations needed to carry the communicated information. An exchange is an important node in the network where several such resources are aggregated in an integrated system node and that is used to connect and enable access to different parts of the whole network. The network and the exchanges are complex long term investments that have evolved and changed over the years in order to cope with new services and challenges in an economically efficient way.
30.	Müller, Ivan, et al. (författare) Evaluation of RTSJ-Based Distributed Control System 2011 Ingår i: Smart Spaces and Next Generation Wired/Wireless Networking. - Heidelberg : Springer Berlin/Heidelberg. - 9783642228759 - 3642228755 ; , s. 295-303 Konferensbidrag (refereegranskat)abstract In this paper an analysis of a distributed control system based on Java is presented. A classical PID controlled system is implemented simulating each part of a real control system running in different computers connected to a local area network. The communication message time periods and their jitter are measured running the system in different computer environments and the results are presented and discussed at the end. Real time specification for Java is used in the implemented software and the results are compared to other implementations. © Springer-Verlag Berlin Heidelberg 2011.
31.	Pelliccione, Patrizio, 1975, et al. (författare) Architecting cars as constituents of a system of systems 2016 Ingår i: ACM International Conference Proceeding Series. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450363990 ; , s. 1-7 Konferensbidrag (refereegranskat)abstract Future transportation systems will be a heterogeneous mix of items with varying connectivity and interoperability. A mix of new technologies and legacy systems will co-exist to realize a variety of scenarios involving not only connected cars but also road infrastructures, pedestrians, cyclists, etc. Future transportation systems can be seen as a System of Systems (SoS), where each constituent system - one of the units that compose an SoS - can act as a standalone system, but the cooperation among the constituent systems enables new emerging and promising scenarios. In this paper we investigate how to architect cars so that they can be constituents of future transportation systems. This work is realized in the context of two Swedish projects coordinated by Volvo Cars and involving some universities and research centers in Sweden and many suppliers of the OEM, including Autoliv, Arccore, Combitech, Cybercom, Knowit, Prevas, ÅF-Technology, Semcom, and Qamcom.
32.	Pignaton de Freitas, Edison, et al. (författare) Cooperation among wirelessly connected static and mobile sensor nodes for surveillance applications 2013 Ingår i: Sensors. - Basel : MDPI. - 1424-8220. ; 13:10, s. 12903-12928 Tidskriftsartikel (refereegranskat)abstract This paper presents a bio-inspired networking strategy to support the cooperation between static sensors on the ground and mobile sensors in the air to perform surveillance missions in large areas. The goal of the proposal is to provide a low overhead in the communication among sensor nodes, while allocating the mobile sensors to perform sensing activities requested by the static ones. Simulations have shown that the strategy is efficient in maintaining low overhead and achiving the desired coordination. © 2013 by the authors; licensee MDPI, Basel, Switzerland.
33.	Pignaton de Freitas, Edison, 1979-, et al. (författare) Exploring geographic context awareness for data dissemination on mobile ad hoc networks 2013 Ingår i: Ad hoc networks. - Amsterdam : Elsevier. - 1570-8705 .- 1570-8713. ; 11:6, s. 1746-1764 Tidskriftsartikel (refereegranskat)abstract The use of mobile software agents is a promising approach to implement services and disseminate data over ad hoc networks. This paper presents an analysis of mobile autonomous agents with different levels of intelligence that allow them to make usage of the positioning information with different complexity in a mobile ad hoc network aiming at efficient data dissemination. This information considers the nodes current and future locations, as well as the route used to reach their destinations, depending on the agents' intelligence. Using this information, the agents decide their movement from node to node during opportunistic connections in order to accomplish their goals related to data dissemination and/or service provisioning. The analysis of this proposal is done in the context of a sensor network application, implemented by sensing services provided by mobile agents, which run on top of an infrastructure-less Vehicular Ad hoc Network (VANET). Simulation results are presented and discussed to support the proposed ideas. (C) 2013 Elsevier B.V. All rights reserved.
34.	Wang, Rui, 1986-, et al. (författare) Region-based Geocast Routing Protocols for VANETs : Summary, Evaluation Methods and Simulation Models 2014 Ingår i: 2014 International Conference on Connected Vehicles and Expo (ICCVE). - Piscataway, NJ : IEEE Press. - 9781479967292 ; , s. 731-738 Konferensbidrag (refereegranskat)abstract Vehicular Ad hoc Networks (VANETs) is a technology to support communication among vehicles or between vehicles and infrastructure in order to exchange traffic information and avoid accidents. Many applications in VANETs need to transmit messages to vehicles within a specific geographic region. This behaviour is called Geocast. Several Geocast routing protocols have been proposed for VANETs. In this paper, some important and representative Geocast routing protocols are summarized and theoretically compared. In order to evaluate the performance of these protocols, the evaluation methods are also defined, which include both the Packet Delivery Ratio (PDR) and the Packet Delivery Time (PDT). Additionally, some important and new models, such as the influences of city lights, and the distance between buildings potentially acting as free line of sight obstacles, are proposed to create a more realistic city environment for Geocast routing simulation. © 2014 IEEE
35.	Yu, Tianyi, 1989-, et al. (författare) Traffic Situation Estimator for Adaptive Cruise Control 2016 Ingår i: 2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM). - Piscataway, NJ : IEEE. - 9781509021857 - 9781509021840 Konferensbidrag (refereegranskat)abstract A traffic situation estimator capable of analyzing driving behavior utilizing an image analysis-based tracking module is presented. The behavior is analyzed by using a state machine driven counter to estimate the traffic rhythm and determine if the detected vehicles are approaching, getting away, have been overtaken or have overtaken the ego-vehicle. Depending on the result, the traffic situation estimator suggest different reactions, either to drive faster, slower or optionally suggest to overtake vehicles ahead to help the driver to follow the traffic rhythm which in turn will improve safety and energy efficiency. The proposed approach is implemented in a smart-phone and has shown good performance while testing the application on a two-lane highway. © 2016 IEEE.
36.	Zhang, Hequn, 1986-, et al. (författare) Simulation of Region-based Geocast Routing Protocols 2014 Ingår i: 2014 International Conference on Connected Vehicles and Expo (ICCVE). - Piscataway, NJ : IEEE Press. - 9781479967292 ; , s. 723-730 Konferensbidrag (refereegranskat)abstract As one of the most important enablers of Intelligent Transportation System (ITS), Inter-Vehicle Communication (IVC) have been a hot research direction in nearly a decade. To improve vehicle safety and cooperative systems, most of ITS applications need efficient and stable Vehicular Ad hoc Networks (VANETs) among vehicles and infrastructures, which can be set up by Geocast routing protocols. Some of these applications require the protocols, known as region-based Geocast routing protocols, supporting to broadcast messages to vehicles within a specific geographic region. Since different protocols are appropriate for different purposes or occasions, it is significant to simulate protocols and evaluate their performances under a variety of scenarios. Therefore, this paper focuses on investigations of simulation environment configurations for some known Geocast routing protocols. According to the investigations, a region based Geocast routing simulator is designed and developed. To demonstrate the effectiveness and the reliability of this simulator, several protocols are simulated and the performances of them are presented. © 2014 IEEE

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