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  • 1201.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Lundström, Jens
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Active In-Database Processing to Support Ambient Assisted Living Systems2014Ingår i: Sensors, E-ISSN 1424-8220, Vol. 14, nr 8, s. 14765-14785Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As an alternative to the existing software architectures that underpin the development of smart homes and ambient assisted living (AAL) systems, this work presents a database-centric architecture that takes advantage of active databases and in-database processing. Current platforms supporting AAL systems use database management systems (DBMSs) exclusively for data storage. Active databases employ database triggers to detect and react to events taking place inside or outside of the database. DBMSs can be extended with stored procedures and functions that enable in-database processing. This means that the data processing is integrated and performed within the DBMS. The feasibility and flexibility of the proposed approach were demonstrated with the implementation of three distinct AAL services. The active database was used to detect bed-exits and to discover common room transitions and deviations during the night. In-database machine learning methods were used to model early night behaviors. Consequently, active in-database processing avoids transferring sensitive data outside the database, and this improves performance, security and privacy. Furthermore, centralizing the computation into the DBMS facilitates code reuse, adaptation and maintenance. These are important system properties that take into account the evolving heterogeneity of users, their needs and the devices that are characteristic of smart homes and AAL systems. Therefore, DBMSs can provide capabilities to address requirements for scalability, security, privacy, dependability and personalization in applications of smart environments in healthcare.

    Ladda ner fulltext (pdf)
    de_morais_active_2014
  • 1202.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Mayr, Matthias
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE). Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Philippsen, Roland
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Ambient Intelligence and Robotics: complementing one another to support Ambient Assisted Living2014Ingår i: IAS-13: The 13th International Conference on Intelligent Autonomous Systems: July 15-19, 2014: Padova and Venice, Italy: Proceedings of Workshops and Tutorials / [ed] Jangmyung Lee, Philippe Martinet, Marcus Strand, Stefano Ghidoni & Matteo Munaro, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    This work combines a database-centric architecture, which supports Ambient Intelligence (AmI) for Ambient Assisted Living, with a ROS-based mobile sensing and interaction robot. The role of the active database is to monitor and respond to events in the environment and the robot subscribes to tasks issued by the AmI system. The robot can autonomously perform tasks such as to search for and interact with a person. Consequently, the two systems combine their capabilities and complement the lack of computational, sensing and actuation resources.

  • 1203.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    A lightweight method for detecting sleep-related activities based on load sensing2014Ingår i: SeGAH 2014: IEEE 3rd International Conference on Serious Games and Applications for Health, Red Hook, NY: Curran Associates, Inc., 2014, artikel-id 7067080Konferensbidrag (Refereegranskat)
    Abstract [en]

    Current practices in healthcare rely on expensive and labor-intensive procedures that are not adequate for future healthcare demands. Therefore, alternatives are required to complement or enhance healthcare services, both at clinical and home settings. Hospital and ordinary beds can be equipped with load cells to enable load sensing applications, such as for weight and sleep assessment. Beds with such functionalities represent a tangible alternative to expensive and obtrusive routines for sleep assessment, such as polysomnography. A finite-state machine is proposed as a lightweight on-line method to detect sleep-related activities, such as bed entrances and exits, awakenings, wakefulness, and sleep atonia. The proposed approach is evaluated with a dataset collected in real homes of older people receiving night-time home care services.

  • 1204.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    A Serious Computer Game to Assist Tai Chi Training for the Elderly2011Ingår i: 2011 IEEE 1st International Conference on Serious Games and Applications for Health, SeGAH 2011, Piscataway: IEEE Press, 2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes the development of a computer-based serious game to enable older individuals to practice Tai Chi at home on their own. The player plays the game by imitating Tai Chi movements presented by a virtual instructor on the screen. The proposed system is decomposed into two modules. The first module is the game design, i.e., the process of recording an instructor training Tai Chi. Acquired data are used to create gesture templates and a virtual instructor. The second module is the game play in which the player attempts to mimic the virtual instructor. Gestures are measured in real-time and then compared with the prerecorded Tai Chi gesture template corresponding to the displayed movement. Visual feedback indicates how well the player imitated the instructor. The proposed system is not designed to classify gestures but to evaluate the similarity of a given gesture with a gesture template. The Longest Common Sub-Sequence (LCSS) method is applied to compute such similarity. The proposed approach (1) facilitates the design of assessment tools in which the user has to follow a sequence of predefined movements and (2) applicable to other domains, such as telerehabilitation.

  • 1205.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    A "Smart Bedroom" as an Active Database System2013Ingår i: Proceedings – 9th International Conference on Intelligent Environments, IE 2013, Los Alamitos, CA: IEEE Computer Society, 2013, s. 250-253, artikel-id 6597820Konferensbidrag (Refereegranskat)
    Abstract [en]

    Home-based healthcare technologies aim to enable older people to age in place as well as to support those delivering care. Although a number of smart homes exist, there is no established method to architect these systems. This work proposes the development of a smart environment as an active database system. Active rules in the database, in conjunction with sensors and actuators, monitor and respond to events taking place in the home environment. Resource adapters integrate heterogeneous hardware and software technologies into the system. A 'Smart Bedroom' has been developed as a demonstrator. The proposed approach represents a flexible and robust architecture for smart homes and ambient assisted living systems. © 2013 IEEE.

  • 1206.
    Ourique de Morais, Wagner
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Evaluation of Extensibility, Portability and Scalability in a Database-centric System Architecture for Smart Home Environments2015Rapport (Refereegranskat)
    Abstract [en]

    Advances in database technology allow modern database systems to serve as a platform for the development, deployment and management of smart home environments and ambient assisted living systems. This work investigates non-functional issues of a database-centric system architecture for smart home environments when: (i) extending the system with new functionalities other than data storage, such as on-line reactive behaviors and advanced processing of longitudinal information, (ii) porting the whole system to different operating systems on distinct hardware platforms, and (iii) scaling the system by incrementally adding new instances of a given functionality. The outcome of the evaluation is demonstrated, and analyzed, for three test functionalities on three heterogeneous computing platforms. As a contribution, this work can help developers in identifying which architectural components in the database-centric system architecture that may become performance bottlenecks when extending, porting and scaling the system.

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    fulltext
  • 1207.
    Ovenmark, Josefin
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Måbrink, Simon
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Låsanordning med induktiv laddning för elcyklar2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna rapport har justerats på grund av sekretess skäl, vissa meningar kan därför vara ändrade.Elcykeln är ett smidigt färdmedel, ett bra alternativ när långa sträckor eller jobbiga backar kan vara ett hinder.Målet för projektet var att skapa en prototyp på en låsanordning med induktiv laddning för elcyklar.Tanken med projektet var att ta fram en användarvänlig låsanordning, där cyklarna skulle laddas induktivt när de var fastlåsta. För att utföra projektet behövdes fakta om induktion, batteriladdning och låsanordningar införskaffas. Kretsar för induktionsladdaren skapades samt en låsanordning konstruerades. En mikroprocessor användes för att styra hela systemet.En prototyp har tagits fram på en låsanordning med induktiv laddning monterad i ett cykelställ.Projektet som helhet blev väldigt stort, vilket medförde att inte alla momenten i projektet kunde genomföras. Men resultatet av projektet blev lyckat då laddningen samt låsningen fungerade samt att prototypen blev klar i tid.

    Ladda ner fulltext (pdf)
    Låsanordning med induktiv laddning för elcyklar
  • 1208.
    Pamplona, Rodrigo Christovam
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Data replication in mobile computing2010Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    With the advances of technology and the popularization of mobile devices, the need of researching and discussing subjects related to mobile devices has raised. One of the subjects that needs to be further analyzed is data replication.

    This study investigates data replication on mobile devices focusing on power consumption. It presents four different scenarios that propose, describe, apply and evaluate data replication mechanisms, with the purpose of finding the best scenario that presents less energy consumption.

    In order to make the experiments, Sun SPOT was chosen as a mobile device. This device is fully programmed in a java environment. A different software was created in each scenario in order to verify the performance of the mobile devices regarding energy saving.

    The results found did not meet the expectations. While trying to find the best scenario a hardware limitation was found. Although software can be easily changed to fix errors, hardware cannot be changed as easily. The implications for the hardware limitation found in this study prevented the results to be optimal. The results found also imply that new hardware should be used in further experimentation. As this study proved to be limited, it suggests that additional studies should be carried out applying the new version of the hardware used in this study.

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    Data replication in mobile computing - Rodrigo Christovam Pamplona.pdf
  • 1209.
    Pankaczi, Lilla
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Eldefrawy, Mohamed Hamdy
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Enhancing the Security of ISO/IEC 14443-3 and 4 RFID Authentication Protocols through Formal Analysis2023Ingår i: 2023 IEEE International Conference on Omni-Layer Intelligent Systems, COINS 2023, IEEE, 2023Konferensbidrag (Refereegranskat)
    Abstract [en]

    Due to cyber attacks targeting RFID systems, this paper briefly summarizes parts 3 and 4 of the ISO/IEC 14443 standard, which specify the initialization, selection, and trans-mission protocols in high-frequency RFID smart-card and reader communication. The communication has been modeled, and two experiments have been performed using a security protocol ana-lyzer tool called Scyther. The protocol verification results shows that implementing Random UID can prevent many RFID attacks, such as eavesdropping and replay attacks and successfully protect the cardholder's privacy. © 2023 IEEE.

  • 1210.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    A Centralized Channel Assignment Algorithm for Clustered Ad Hoc Networks2013Ingår i: ICWiSe: Sarawak : 2 – 4 December 2013: Proceeding Book / [ed] Hamzah Asyrani Bin Sulaiman, Mohd Azlishah Bin Othman & Muhammad Noorazlan Shah Bin Zainudin, Piscataway, NJ: IEEE conference proceedings, 2013, , s. 6s. 73-78, artikel-id 6728784Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents new channel assignment algorithm for a clustered ad hoc network. The suggested method is based on a graph-theoretic model and seeks a solution for the channel assignment problem in a clustered ad hoc network. The method is based on a new meta-heuristic algorithm that is referred to as imperialist competitive algorithm (ICA). It provides a scheme for allocating the available channels to the cluster heads, maximizing spectrum efficiency and minimizing co-channel interference. The suggested method is tested for several scenarios and its performance is compared with a genetic algorithm based scheme. © 2013 IEEE

  • 1211.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    An emotional learning-inspired ensemble classifier (ELiEC)2013Ingår i: Proceedings of the 2013 Federated Conference on Computer Science and Information Systems (FedCSIS) / [ed] M. Ganzha, L. Maciaszek & M. Paprzycki, Los Alamitos, CA: IEEE Computer Society, 2013, s. 137-141, artikel-id 6643988Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, we suggest an inspired architecture by brain emotional processing for classification applications. The architecture is a type of ensemble classifier and is referred to as 'emotional learning-inspired ensemble classifier' (ELiEC). In this paper, we suggest the weighted k-nearest neighbor classifier as the basic classifier of ELiEC. We evaluate the ELiEC's performance by classifying some benchmark datasets. © 2013 Polish Information Processing Society.

  • 1212.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    An Imperialist Competitive Algorithm For Interference-Aware Cluster-heads Selection in Ad hoc Networks2014Ingår i: Proceedings: 2014 IEEE 28th International Conference on Advanced Information Networking and Applications: IEEE AINA 2014: 13-16 May 2014: University of Victoria, Victoria, Canada, Los Alamitos, CA: IEEE Computer Society, 2014, s. 41-48Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    This paper presents the results of applying a new clustering algorithm in ad hoc networks. This algorithm is a centralized method and is designed on the basis of an imperialist competitive algorithm (ICA). This algorithm aims to find a minimum number of cluster-heads while satisfying two constraints, the connectivity and interference. This work is a part of an ongoing research to develop a distributed interference aware cluster-based channel allocation method. As a matter of fact, the results of the centralized method are required to provide an upper level for the performance of the distributed version. The suggested method is evaluated for several scenarios and compares the obtained results with the reported results of ant colony optimization-based methods. © 2014 IEEE.

  • 1213.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Ant Colony Optimization for Channel Assignment Problem in Clustered Mobile Ad Hoc Network2013Ingår i: Advances in Swarm Intelligence, Berlin Heidelberg: Springer Berlin/Heidelberg, 2013, Vol. 7928, s. 314-322Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    This paper presents an ant colony optimization (ACO) method as a method for channel assignment in a mobile ad hoc network (MANET), where achieving high spectral efficiency necessitates an efficient channel assignment. The suggested algorithm is intended for graph-coloring problems and it is specifically tweaked to the channel assignment problem in MANET with a clustered network topology. A multi-objective function is designed to make a tradeoff between maximizing spectral utilization and minimizing interference. We compare the convergence behavior and performance of ACO-based method with obtained results from a grouping genetic algorithm (GGA). © 2013 Springer-Verlag Berlin Heidelberg.

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    ICSI
  • 1214.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Brain Emotional Learning Based Fuzzy Inference System (BELFIS) for Solar Activity Forecasting2012Ingår i: 2012 IEEE 24th International Conference on Tools with Artificial Intelligence (ICTAI 2012), Vol. 1, Piscataway, NJ: IEEE Press, 2012, s. 532-539, artikel-id 6495090Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents a new architecture based on a brain emotional learning model that can be us.ed in a wide varieties of AI applications such as prediction, identification and classification. The architecture is referred to as: Brain Emotional Learning Based Fuzzy Inference System (BELFIS) and it is developed from merging the idea of prior emotional models with fuzzy inference systems. The main aim of this model is presenting a desirable learning model for chaotic system prediction imitating the brain emotional network. In this research work, the model is used for predicting the solar activity, since it has been recognized as a threat to critical infrastructures in modern society. Specifically sunspot numbers are predicted by applying the proposed brain emotional learning model. The prediction results are compared with the outcomes of using other previous models like the locally linear model tree (LOLIMOT) and radial bias function (RBF) and adaptive neuro-fuzzy inference system (ANFIS). © 2012 IEEE.

  • 1215.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Brain Emotional Learning Based Fuzzy Inference System (Modified using Radial Basis Function)2013Ingår i: Eighth International Conference on Digital Information Management (ICDIM 2013), Piscataway, NJ: IEEE Press, 2013, s. 206-211, artikel-id 6693994Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents a modified model of brain emotional learning based fuzzy inference system (BELFIS). It has been suggested to predict chaotic time series. We modify the BELFIS model merging radial basis function network with adaptive neuro-fuzzy network. The suggested model is evaluated by testing on complex systems and the obtained results are compared with the results of other studies. © 2013 IEEE.

  • 1216.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Imperialist Competition Algorithm for DSA in Cognitive Radio Networks2012Ingår i: 2012 8th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM2012): September 21-23, 2012, Shanghai, China / [ed] C. Kurzawa, D. Graffox & G. MacPherson, Piscataway, NJ: IEEE conference proceedings, 2012, s. 1726-1729, artikel-id 6478538Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper a novel optimization method called imperialist competitive algorithm (ICA) is applied to solve the channel assignment problem in a mobile ad hoc network. First the imperialist competitive algorithm (ICA) is described, which has been proposed as an evolutionary optimization method, and after that it is explained how it can seek a near optimal solution for the channel allocation problem in a cognitive mobile ad hoc radio network. The simulation results are compared with the results that were obtained by applying island genetic algorithm. © 2012 IEEE

  • 1217.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Interference-Aware Clustering Algorithms for Mobile ad hoc Network: Ant Colony optimization-based Algorithm2013Ingår i: Proceedings of SNCNW 2013: The 9th Swedish National Computer Networking Workshop: Lund, June 3-4, 2013, 2013, s. 61-66Konferensbidrag (Refereegranskat)
    Abstract [en]

    The next generation tactical networks will be based on mobile ad hoc networks (MANETs). These networks require as well a stable clustered network structure as an efficient channel assignment optimization method. Efficient spatial channel reuse provides network scalability and high spectral efficiency. In this paper, a centralized clustering algorithm scheme based on ant colony optimization (ACO) is suggested for forming clusters and assigning channels to clusters. Ant colony optimization (ACO) is used to select the cluster heads in an as advantageous way as possible. A multi-objective function is designed to maximize the stability and scalability, minimize the number of clusters and inter-cluster interference power. The suggested algorithms are evaluated for numerous scenarios. Particularly, the performance of ACO-based clustering algorithm is compared with other clustering algorithms.

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    SNCNW2013
  • 1218.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Merging ant colony optimization based clustering and an imperialist competitive algorithm for spectrum management of a cognitive mobile ad hoc network2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    Next generation tactical military network will be based on mobile ad hoc networks (MANET). These networks require efficient spatial channel reuse in order to provide high spectral efficiency and this requires as well a stable network structure as an efficient channel assignment optimization method. In this paper ant colony optimization (ACO) and imperialist competitive algorithm (ICA) are merged in the cognitive manager for the combined clustering and channel assignment problem in a clustered based MANET. Ant colony optimization is used to choose the cluster head in an as advantageous way as possible. The used multi-objective function is defined to maximize the stability and scalability, minimize the number of clusters, and minimizing interference power in between clusters. The imperialist competitive algorithm is applied for solving the channel assignment problem. In this case the multi-objective function minimizes interference and maximizes the spectral efficiency.

  • 1219.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Neuro-Fuzzy Models, BELRFS and LOLIMOT, for Prediction of Chaotic Time Series2012Ingår i: INISTA 2012: International Symposium on Innovations in Intelligent Systems and Applications : 2-4 July, 2012 : Trabzon, Turkey, Piscataway, N.J.: IEEE Press, 2012, s. Article number 6247025-, artikel-id 624702Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper suggests a novel learning model for prediction of chaotic time series, brain emotional learning-based recurrent fuzzy system (BELRFS). The prediction model is inspired by the emotional learning system of the mammal brain. BELRFS is applied for predicting Lorenz and Ikeda time series and the results are compared with the results from a prediction model based on local linear neuro-fuzzy models with linear model tree algorithm (LoLiMoT). © 2012 IEEE.

  • 1220.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Using the grouping genetic algorithm (GGA) for channel assignment in a cluster-based mobile ad hoc network2012Ingår i: Proceedings of SNCNW 2012: The 8th Swedish National Computer Networking Workshop: Stockholm, June 7-8, 2012, 2012, s. 56-60Konferensbidrag (Refereegranskat)
    Abstract [en]

    Next generation tactical military network will be based on mobile ad hoc networks (MANET). These networks require efficient spatial channel reuse in order to provide high spectral efficiency and this is only achieved by efficient channel assignment optimization. For a clustered network topology the basic goal is to assign different channels to adjacent clusters, i.e. a graph coloring problem. Unfortunately, is the optimal solution for graph coloring problems intractable, the problem is NP-hard. As a consequence heuristic methods must be applied, which provide solutions with as close to optimal result as possible. In this article the grouping genetic algorithm is applied for solving the channel assignment problem in a cluster based mobile ad hoc network. The used multi objective function minimizes interference and maximizes the spectral efficiency.

  • 1221.
    Parsapoor, Mahboobeh
    et al.
    McGill University, Montreal, QC H3A 2T6, Canada.
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Svensson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Forecasting Solar Activity with Computational Intelligence Models2018Ingår i: IEEE Access, E-ISSN 2169-3536, Vol. 6, s. 70902-70909Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is vital to accurately predict solar activity, in order to decrease the plausible damage of electronic equipment in the event of a large high-intensity solar eruption. Recently, we have proposed brain emotional learning-based fuzzy inference system (BELFIS) as a tool for the forecasting of chaotic systems. The structure of BELFIS is designed based on the neural structure of fear conditioning. The function of BELFIS is implemented by assigning adaptive networks to the components of the BELFIS structure. This paper especially focuses on the performance evaluation of BELFIS as a predictor by forecasting solar cycles 16-24. The performance of BELFIS is compared with other computational models used for this purpose, in particular with the adaptive neuro-fuzzy inference system. © 2018 IEEE.

  • 1222.
    Parsapoor, Mahboobeh
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES). School of Computer Science, Faculty of Engineering & Physic al Science, The University of Manchester, Manchester, United Kingdom.
    Bilstrup, Urban
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Svensson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Prediction of Solar Cycle 24: Using a Connectionist Model of the Emotional System2015Ingår i: 2015 International Joint Conference on Neural Networks (IJCNN), Piscataway, NJ: IEEE Press, 2015, artikel-id 7280839Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Accurate prediction of solar activity as one aspect of space weather phenomena is essential to decrease the damage from these activities on the ground based communication, power grids, etc. Recently, the connectionist models of the brain such as neural networks and neuro-fuzzy methods have been proposed to forecast space weather phenomena; however, they have not been able to predict solar activity accurately. That has been a motivation for the development of the connectionist model of the brain; this paper aims to apply a connectionist model of the brain to accurately forecasting solar activity, in particular, solar cycle 24. The neuro-fuzzy method has been referred to as the brain emotional learning-based recurrent fuzzy system (BELRFS). BELRFS is tested for prediction of solar cycle 24, and the obtained results are compared with well-known neuro-fuzzy methods and neural networks as well as with physical-based methods. @2015 IEEE

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  • 1223.
    Paula, Maicke C. G.
    et al.
    University of Beira Interior, Covilhã, Portugal & Fiat Automobile, Brazil.
    Rodrigues, Joel J. P. C.
    University of Beira Interior, Covilhã, Portugal & ITMO University, St. Petersburg, Russia.
    Dias, João A.
    University of Beira Interior, Covilhã, Portugal.
    Isento, João N.
    University of Beira Interior, Covilhã, Portugal.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Performance Evaluation of a Real Vehicular Delay-Tolerant Network Testbed2015Ingår i: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477, Vol. 2015, artikel-id 219641Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Vehicular Delay-Tolerant Networks (VDTNs) are a breakthrough based DTN solution used to provide vehicular communications under challenging scenarios, characterized by long delays and sporadic connections. Using the store-carry-and-forward paradigm, this technology allows in-transit bundles to asynchronously reach the destination hop by hop over traveling vehicles equipped with short-range wireless devices. The VDTN architecture assumes out-of-band signaling with control and data planes separation and follows an IP over VDTN approach. This paper presents a real-world VDTN prototype evaluated through a safety application and a Traffic Jam Information Service. It also demonstrates the real deployment of this new vehicular communication approach. The real testbed is an important contribution since some complex issues presented in vehicular communication systems can be studied more accurately in real-world environments than in a laboratory approach. The results confirm that real deployment of VDTNs is doable and can be seen as a very promising technology for vehicular communications, although it requires appropriated technologies for outline interferences and quality of service support. © 2015 Maicke C. G. Paula et al.

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  • 1224.
    Paula, Maicke
    et al.
    University of Beira Interior, Covilhã, Portugal.
    Rodrigues, Joel
    University of Beira Interior, Covilhã, Portugal.
    Dias, João
    University of Beira Interior, Covilhã, Portugal.
    Isento, João
    University of Beira Interior, Covilhã, Portugal.
    Vinel, Alexey
    Department of Communications Engineering, Tampere University of Technology, Tampere, Finland.
    Deployment of a Real Vehicular Delay-Tolerant Network Testbed2012Ingår i: 2012 12th International Conference on ITS Telecommunications (ITST), Piscataway, N.J.: IEEE Press, 2012, s. 103-107Konferensbidrag (Refereegranskat)
  • 1225.
    Pašalić, Emir
    et al.
    OGI School of Science & Engineering, Oregon Health & Science University, Hillsboro, Oregon, USA.
    Taha, Walid
    Computer Science Department, Rice University, Houston, TX, USA.
    Sheard, Tim
    OGI School of Science & Engineering, Oregon Health & Science University, Portland, Oregon, USA.
    Tagless Staged Interpreters for Typed Languages2002Ingår i: ICFP '02: Proceedings of the Seventh ACM SIGPLAN International Conference on Functional Programming, New York, NY: ACM Press, 2002, Vol. 37, s. 218-229Konferensbidrag (Refereegranskat)
    Abstract [en]

    Multi-stage programming languages provide a convenient notation for explicitly staging programs. Staging a definitional interpreter for a domain specific language is one way of deriving an implementation that is both readable and efficient. In an untyped setting, staging an interpreter "removes a complete layer of interpretive overhead", just like partial evaluation. In a typed setting however, Hindley-Milner type systems do not allow us to exploit typing information in the language being interpreted. In practice, this can mean a slowdown cost by a factor of three or more. Previously, both type specialization and tag elimination were applied to this problem. In this paper we propose an alternative approach, namely, expressing the definitional interpreter in a dependently typed programming language. We report on our experience with the issues that arise in writing such an interpreter and in designing such a language. To demonstrate the soundness of combining staging and dependent types in a general sense, we formalize our language (called Meta-D) and prove its type safety. To formalize Meta-D, we extend Shao, Saha, Trifonov and Papaspyrou's λH language to a multilevel setting. Building on λH allows us to demonstrate type safety in a setting where the type language contains all the calculus of inductive constructions, but without having to repeat the work needed for establishing the soundness of that system.

  • 1226.
    Pedrollo, Guilherme
    et al.
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Aparecida Konzen, Andréa
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Ourique de Morais, Wagner
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Pignaton de Freitas, Edison
    Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Using smart virtual-sensor nodes to improve the robustness of indoor localization systems2021Ingår i: Sensors, E-ISSN 1424-8220, Vol. 21, nr 11, artikel-id 3912Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Young, older, frail, and disabled individuals can require some form of monitoring or assistance, mainly when critical situations occur, such as falling and wandering. Healthcare facilities are increasingly interested in e-health systems that can detect and respond to emergencies on time. Indoor localization is an essential function in such e-health systems, and it typically relies on wireless sensor networks (WSN) composed of fixed and mobile nodes. Nodes in the network can become permanently or momentarily unavailable due to, for example, power failures, being out of range, and wrong placement. Consequently, unavailable sensors not providing data can compromise the system’s overall function. One approach to overcome the problem is to employ virtual sensors as replacements for unavailable sensors and generate synthetic but still realistic data. This paper investigated the viability of modelling and artificially reproducing the path of a monitored target tracked by a WSN with unavailable sensors. Particularly, the case with just a single sensor was explored. Based on the coordinates of the last measured positions by the unavailable node, a neural network was trained with 4 min of not very linear data to reproduce the behavior of a sensor that become unavailable for about 2 min. Such an approach provided reasonably successful results, especially for areas close to the room’s entrances and exits, which are critical for the security monitoring of patients in healthcare facilities. © 2021 by the authors.

  • 1227.
    Pelliccione, Patrizio
    et al.
    Dipartimento di Ingegneria e Scienze dell'Informazione e Matematica, Università degli Studi dell'Aquila, L'Aquila, Italy & Chalmers, Gothenburg University, Gothenburg, Sweden.
    Knauss, Eric
    Chalmers, Gothenburg University, Gothenburg, Sweden.
    Ågren, S. Magnus
    Chalmers, Gothenburg University, Gothenburg, Sweden.
    Heldal, Rogardt
    Chalmers, Gothenburg University, Gothenburg, Sweden & Western Norway University of Applied Sciences, Bergen, Norway.
    Bergenhem, Carl
    Qamcom Research & Technology AB, Gothenburg, Sweden.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES). Western Norway University of Applied Sciences, Bergen, Norway.
    Brunnegård, Oliver
    Veoneer Sweden AB, Vårgårda, Sweden.
    Beyond connected cars: A systems of systems perspective2020Ingår i: Science of Computer Programming, ISSN 0167-6423, E-ISSN 1872-7964, Vol. 191, artikel-id 102414Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The automotive domain is rapidly changing in the last years. Among the different challenges OEMs (i.e. the vehicle manufacturers) are facing, vehicles are evolving into systems of systems. In fact, over the last years vehicles have evolved from disconnected and “blind" systems to systems that are (i) able to sense the surrounding environment and (ii) connected with other vehicles, the city, pedestrians, cyclists, etc. Future transportation systems can be seen as a System of Systems (SoS). In an SoS, constituent systems, i.e. the units that compose an SoS, can act as standalone systems, but their cooperation enables new emerging and promising scenarios. While this trend creates new opportunities, it also poses a risk to compromise key qualities such as safety, security, and privacy.

    In this paper we focus on the automotive domain and we investigate how to engineer and architect cars in order to build them as constituents of future transportation systems. Our contribution is an architectural viewpoint for System of Systems, which we demonstrate based on an automotive example. Moreover, we contribute a functional reference architecture for cars as constituents of an SoS. This reference architecture can be considered as an imprinting for the implementations that would be devised in specific projects and contexts. We also point out the necessity for a collaboration among different OEMs and with other relevant stakeholders, such as road authorities and smart cities, to properly engineer systems of systems composed of cars, trucks, roads, pedestrians, etc. 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. © 2020 Published by Elsevier.

  • 1228.
    Peng, Jiaxin
    et al.
    George Washington University, Washington, USA.
    Alkabani, Yousra
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Puri, Krunal
    George Washington University, Washington, USA.
    Ma, Xiaoxuan
    George Washington University, Washington, USA.
    Sorger, Volker
    George Washington University, Washington, USA.
    El-Ghazawi, Tarek
    George Washington University, Washington, USA.
    A Deep Neural Network Accelerator using Residue Arithmetic in a Hybrid Optoelectronic System2022Ingår i: ACM Journal on Emerging Technologies in Computing Systems, ISSN 1550-4832, E-ISSN 1550-4840, Vol. 18, nr 4, artikel-id 81Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The acceleration of Deep Neural Networks (DNNs) has attracted much attention in research. Many critical real-time applications benefit from DNN accelerators but are limited by their compute-intensive nature. This work introduces an accelerator for Convolutional Neural Network (CNN), based on a hybrid optoelectronic computing architecture and residue number system (RNS). The RNS reduces the optical critical path and lowers the power requirements. In addition, the wavelength division multiplexing (WDM) allows high-speed operation at the system level by enabling high-level parallelism. The proposed RNS compute modules use one-hot encoding, and thus enable fast switching between the electrical and optical domains. We propose a new architecture that combines residue electrical adders and optical multipliers as the matrix-vector multiplication unit. Moreover, we enhance the implementation of different CNN computational kernels using WDM-enabled RNS based integrated photonics. The area and power efficiency of the proposed accelerator are 0.39 TOPS/s/mm(2) and 3.22 TOPS/s/W, respectively. In terms of computation capability, the proposed chip is 12.7x and 4.02x better than other optical implementation and memristor implementation, respectively. Our experimental evaluation using DNN benchmarks illustrates that our architecture can perform on average more than 72 times faster than GPU under the same power budget. © 2023 ACM, Inc.

  • 1229.
    Peng, Jiaxin
    et al.
    George Washington University, Washington, DC, United States.
    Alkabani, Yousra
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Sun, Shuai
    George Washington University, Washington, DC, United States.
    Sorger, Volker J.
    George Washington University, Washington, DC, United States.
    El-Ghazawi, Tarek A.
    George Washington University, Washington, DC, United States.
    DNNARA: A Deep Neural Network Accelerator using Residue Arithmetic and Integrated Photonics2020Ingår i: Proceedings of the 49th International Conference on Parallel Processing, New York: Association for Computing Machinery (ACM), 2020, s. 1-11, artikel-id 3404467Konferensbidrag (Refereegranskat)
    Abstract [en]

    Deep Neural Networks (DNNs) are currently used in many fields, including critical real-time applications. Due to its compute-intensive nature, speeding up DNNs has become an important topic in current research. We propose a hybrid opto-electronic computing architecture targeting the acceleration of DNNs based on the residue number system (RNS). In this novel architecture, we combine the use of Wavelength Division Multiplexing (WDM) and RNS for efficient execution. WDM is used to enable a high level of parallelism while reducing the number of optical components needed to decrease the area of the accelerator. Moreover, RNS is used to generate optical components with short optical critical paths. In addition to speed, this has the advantage of lowering the optical losses and reducing the need for high laser power. Our RNS compute modules use one-hot encoding and thus enable fast switching between the electrical and optical domains. 

    In this work, we demonstrate how to implement the different DNN computational kernels using WDM-enabled RNS based integrated photonics. We provide an accelerator architecture that uses our designed components and perform design space exploration to select efficient architecture parameters. Compared to memristor crossbars, our residue matrix-vector multiplication unit has two orders of magnitude higher peak performance. Our experimental evaluation using DNN benchmarks illustrates that our architecture can perform more than 19 times faster than the state of the art GPUs under the same power budget. © 2020 ACM.

  • 1230.
    Pentakota, Uday Kumar
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energivetenskap.
    Cost estimation and procedure to setup 1MW waste-to-energy gasification plant in India2016Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    With an increasing demand for electrical energy, it is certain that the production will also increase,especially in rapid developing countries like India. Rapid industrialization is carving for more electrical energy, investment and suitable space for its infrastructure. But this development has to be sustainable keeping in mind the increasing global temperature due to pollution.

    India is the second largest population in the world and hence produces a lot of waste daily. As of now, most of the waste goes to the landfills and gets burnt there or decomposed, either way releasing greenhouse gases in the process and degrading the environment. The municipal waste management is a challenging process in developing countries because of non-availability of proper infrastructure. There are some methods to manage this waste, such as scientific landfills,Incineration, Biomethanation, Gasification, Pyrolysis and Plasma Arc Gasification.By Gasification the solid waste is converted into synthesis gas which can be used for chemical industries, power generation, transportation and industrial heating etc. This process shrinks the solid waste to slag or ash which can either be used to manufacture eco bricks or can be disposed of on landfill. Thus saving a lot of place from land filling and if used for power generation it does not release any considerable harmful gases into the environment making it a sustainable process and partially renewable source of energy.

    This project will estimate the capital requirement and procedure to setup a 1 MW gasification plant in Indian state of Telangana. In the study, the generation, composition, treatment and energy potential of solid waste have been studied. The technologies for waste-to-energy conversion have also been studied and the feasibility comparison of two leading technologies has been done.

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  • 1231.
    Persson, Andreas
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Bengtsson, Lars
    Department of Computer Science and Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Forward and Reverse Converters and Moduli Set Selection in Signed-Digit Residue Number Systems2009Ingår i: Journal of Signal Processing Systems, ISSN 1939-8018, E-ISSN 1939-8115, Vol. 56, nr 1, s. 1-15Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents an investigation into using a combination of two alternative digital number representations; the residue number system (RNS) and the signed-digit (SD) number representation in digital arithmetic circuits. The combined number system is called RNS/SD for short. Since the performance of RNS/SD arithmetic circuits depends on the choice of the moduli set (a set of pairwise prime numbers), the purpose of this work is to compare RNS/SD number systems based on different sets. Five specific moduli sets of different lengths are selected. Moduli-set-specific forward and reverse RNS/SD converters are introduced for each of these sets. A generic conversion technique for moduli sets consisting of any number of elements is also presented. Finite impulse response (FIR) filters are used as reference designs in order to evaluate the performance of RNS/SD processing. The designs are evaluated with respect to delay and circuit area in a commercial 0.13 μm CMOS process. For the case of FIR filters it is shown that generic moduli sets with five or six moduli results in designs with the best area × delay products.

  • 1232.
    Persson, Anton
    Högskolan i Halmstad, Akademin för informationsteknologi.
    A Multi-camera based Next Best View Approach for Semantic Scene Understanding2023Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Robots are becoming more common; robotics has gone from bleeding-edge technology to an everyday topic that families discuss around thedinner table.The number of robots in the industry is growing, which means thatthe demand and need for robots to understand the environment it isworking in is also growing.The standard method for a robot to gather information about a sceneinvolves moving to different pre-determined poses from which it canview and analyze the scene. However, this approach does not con-sider the topology of the scene that the robot should explore.This thesis aims to create a two-dimensional approach to determinethe next best view ( 2D-NBV) to view and explore the scene, intro-duced in the method section.The 2D-NBV method converts a point cloud of the scene to an ele-vation map. A segmenting network is used to get the positions ofpre-trained objects. The positions are then used to generate a2DGaussian kernel heatmap of the scene. Using the 2D elevation andGaussian map, the NBV pose is then calculated. The NBV pose isthen converted back to a 6D pose that the robot moves to capture anew point cloud and register it to the scene.The 2D-NBV method is compared to a baseline and a state-of-the-artmethod. The baseline method captures four different point cloudsfrom pre-determined positions and registers them together. The state-of-the-art methods find a point of interest and declare a set of viewcandidates on a sphere around the point. Ray casting is used to findthe pose with the highest information gain. This pose is set as theNBV for the robot to move to. The goal of this thesis is that themethod should perform better than the baseline method, describedfurther in the method section.The evaluation metric used in this thesis is how wellthe differentmethods could estimate the bounding boxes of pre-trained items us-ing an off-the-shelf semantic scene segmentation method. Six sceneswith varying difficulty were constructed to test the methods.The results showed that the 2D-NBV method successfully comple-mented the scene with information about its empty cells. The 2D-NBV outperforms the state-of-the-art on occluded scenes. The 2D-NBV performed overall just as well as the baseline. The reason thatthe 2D-NBV did not outperform the baseline is seen as a consequenceof the information loss going from 3D to 2D.

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  • 1233.
    Persson, Anton
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Dymne, Niklas
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Alonso-Fernandez, Fernando
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Classification of PS and ABS Black Plastics for WEEE Recycling Applications2021Ingår i: 2021 8th International Conference on Soft Computing & Machine Intelligence (ISCMI), Piscataway, NJ: IEEE, 2021, s. 219-224Konferensbidrag (Refereegranskat)
    Abstract [en]

    Pollution and climate change are some of the biggest challenges that humanity is facing. In such a context, efficient recycling is a crucial tool for a sustainable future. This work is aimed at creating a system that can classify different types of plastics by using picture analysis, in particular, black plastics of the type Polystyrene (PS) and Acrylonitrile Butadiene Styrene (ABS). They are two common plastics from Waste from Electrical and Electronic Equipment (WEEE). For this purpose, a Convolutional Neural Network has been tested and retrained, obtaining a validation accuracy of 95%. Using a separate test set, average accuracy goes down to 86.6%, but a further look at the results shows that the ABS type is correctly classified 100% of the time, so it is the PS type that accumulates all the errors. Overall, this demonstrates the feasibility of classifying black plastics using CNN machine learning techniques. It is believed that if a more diverse and extensive image dataset becomes available, a system with higher reliability that generalizes well could be developed using the proposed methodology.  © 2021 IEEE.

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  • 1234.
    Persson, Jesper
    et al.
    Högskolan i Halmstad.
    Dahl, Kristoffer
    Högskolan i Halmstad.
    Control and Monitoring of a BTES-System2016Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Termisk energi som solfångare producerar kan lagras i Borehole Thermal Energy Storage, BTES, när efterfrågan är låg, för att sedan användas när efterfrågan är hög. Målet med detta examensarbete är att utveckla en skalbar systemarkitektur för styrning och monitorering av en BTES prototyp, där ringarna som borrhålen utgör är indelade i olika temperaturhierarkier. De ringar som ligger närmare centrum av borrhålen har högre temperaturhierarki än de som ligger längre ut. Driftinformation från systemet ska kunna följas på en webbplats och temperaturdata från systemet ska sparas undan för lagring. Datakommunikationen består av en One-Wire buss som innehåller temperatursensorer och ett CAN-buss system för datakommunikation mellan sensor/aktuator-noder och server-nod. Utifrån sensordata bestäms reglering av ventiler. Driftinformation lagras i en databas och från denna databas presenteras informationen på en hemsida. Hemsidan innehåller en överblick av brunnparken där temperaturen i varje brunn kan utläsas. Regleralgoritmen uppfyller den sökta temperaturhierarkin där de högsta temperaturerna ska vara i centrum av brunnparken. Prototypen fungerar som en utvecklingsplattform och demonstrerande prototyp.

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  • 1235.
    Peters, S. C.
    et al.
    MIT, USA.
    Frazzoli, E.
    MIT, USA.
    Iagnemma, Karl
    MIT, USA.
    Differential flatness of a front-steered vehicle with tire force control2011Ingår i: Intelligent Robots and Systems (IROS), 2011 IEEE/RSJ International Conference on, Piscataway, N.J.: IEEE Press, 2011, s. 298-304Konferensbidrag (Refereegranskat)
    Abstract [en]

    A trajectory tracking controller based on differential flatness is presented for a nonlinear bicycle model. This controller maps the bicycle dynamics into a point mass located at a center of oscillation with an additional degree of freedom of yaw dynamics. A state transformation is performed that reveals structure in the yaw dynamics resembling a Liénard system. A candidate Lyapunov function inspired by this structure is used to assess the stability of the yaw dynamics while tracking straight-line trajectories and steady turns. The basin of attraction of the controller is limited by actuator constraints and the presence of unstable equilibrium points during turns with high lateral acceleration. The controller properties and the stability of yaw dynamics are demonstrated in simulation. © 2011 IEEE.

  • 1236.
    Peters, S. C.
    et al.
    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States.
    Iagnemma, Karl
    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States.
    An analysis of rollover stability measurement for high-speed mobile robots2006Ingår i: Robotics and Automation, 2006. ICRA 2006. Proceedings 2006 IEEE International Conference on, Piscataway: IEEE Press, 2006, s. 3711-3716Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mobile robots and passenger vehicles are frequently required to operate at high speeds, on terrain that is sloped or uneven. These systems can be susceptible to rollover, particularly during severe maneuvers. This paper presents an analysis of rollover stability measurement for mobile robots operating at high speeds. The analysis examines the accuracy of a commonly accepted rollover stability metric during operation on sloped and rough terrain. The effects of sensor placement, center-of-gravity position estimation error, and wheel dynamics are examined. It is shown that these effects can have a significant impact on stability measurement during high speed operation.

  • 1237.
    Peters, Steven C.
    et al.
    MIT, USA.
    Bobrow, James E.
    Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA 92697, United States.
    Iagnemma, Karl
    MIT, USA.
    Stabilizing a Vehicle near Rollover: An Analogy to Cart-Pole Stabilization2010Ingår i: 2010 IEEE international conference on robotics and automation, Piscataway, N.J.: IEEE Press, 2010, s. 5194-5200Konferensbidrag (Refereegranskat)
    Abstract [en]

    An analogy between the dynamics of a cart-pole system and vehicle rollover dynamics is used to derive a controller for tipping up and stabilizing a planar model of a passenger vehicle near rollover by controlling lateral tire friction forces. The controller is based on a previously published controller for stabilizing a cart-pole using partial feedback linearization and energy shaping. A necessary condition for tip-up is given based on the surface friction coefficient and the location of the vehicle center of gravity (c.g.). A multi-body vehicle model with suspension is presented in the form of the robotic manipulator equations. Simulation results are presented demonstrating the effect of friction and suspension properties on the tip-up problem. ©2010 IEEE.

  • 1238.
    Peters, Steven C.
    et al.
    MIT, USA.
    Iagnemma, Karl
    MIT, USA.
    Mobile robot path tracking of aggressive maneuvers on sloped terrain2008Ingår i: 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) / [ed] Raja Chatila, Alonzo Kelly & Jean-Pierre Merlet, Piscataway, N.J.: IEEE Robotics and Automation Society, 2008, s. 242-247Konferensbidrag (Refereegranskat)
    Abstract [en]

    Path tracking control on non-flat terrain is an important capability of mobile robots operating in outdoor environments. A path tracking controller based on the model predictive control (MPC) framework is presented that explicitly considers terrain geometry and actuator limitations. The controller performance is studied with three vehicle dynamic models in a high-fidelity ADAMS simulation. The effect of model order on path tracking performance on flat terrain and sloped terrain is evaluated. It is shown that improved performance can be obtained by explicitly considering terrain effects. ©2008 IEEE.

  • 1239.
    Petersson, Daniel
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligenta system (IS-lab).
    Johansson, Jonas
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligenta system (IS-lab).
    Holmberg, Ulf
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligenta system (IS-lab).
    Åstrand, Björn
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligenta system (IS-lab).
    Torque Sensor Free Power Assisted Wheelchair2007Ingår i: ICORR '07: 2007 IEEE 10th International Conference on Rehabilitation Robotics : June 12-15, Noordwijk, The Netherlands, Piscataway, N.J.: IEEE Press, 2007, s. 151-157Konferensbidrag (Refereegranskat)
    Abstract [en]

    A power assisted wheelchair combines human power, which is delivered by the arms through the pushrims, with electrical motors, which are powered by a battery. Todays electric power assisted wheelchairs use force sensors to measure the torque exerted on the pushrims by the user. This leads to rather expensive and clumsy constructions. A new design, which only relies on velocity feedback, thus avoiding the use of expensive force sensors in the pushrims, is proposed in this paper. The control design is based on a simple PD-structure with only two design parameters easily tuned to fit a certain user; one parameter is used to adjust the amplification of the user’s force and the other one is used to change the lasting time of the propulsion influence. Since the new assisting control system only relies on the velocity, the torque sensor free power assisted wheelchair will besides giving the user assisting power also give an assistant, which pushes the wheelchair, additional power. This is a big advantage compared to the pushrim activated one, where this benefit for the assistant is not possible.

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  • 1240.
    Pettersson, H.
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Warburton, R. J.
    Ctr. for NanoScience and Sektion P., Ludwig-Maximilians Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
    Lorke, A.
    Ctr. for NanoScience and Sektion P., Ludwig-Maximilians Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
    Karrai, K.
    Ctr. for NanoScience and Sektion P., Ludwig-Maximilians Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
    Kotthaus, J.P.
    Ctr. for NanoScience and Sektion P., Ludwig-Maximilians Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
    Garcia, J.M.
    QUEST and Materials Department, University of California, Santa Barbara, CA 93106, United States.
    Petroff, P.M.
    QUEST and Materials Department, University of California, Santa Barbara, CA 93106, United States.
    Excitons in self-assembled quantum ring-like structures2000Ingår i: Physica. E, Low-Dimensional systems and nanostructures, ISSN 1386-9477, E-ISSN 1873-1759, Vol. 6, nr 1-4, s. 510-513Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A remarkable morphological change of self-assembled InAs quantum dots takes place during growth if a pause is introduced after overgrowing the dots with a few nm of GaAs. Atomic force microscopy indicates that the shape of the dots changes lens-like to ring-like. We report here the results of capacitance and interband transmission experiments on such ring-like structures embedded in a GaAs matrix. In particular, we compare the electronic properties of conventional dots with those of the rings. Significant changes are found which qualitatively support a quantum ring model. (C) 2000 Elsevier Science B.V. All rights reserved.

  • 1241.
    Pettersson, Håkan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Landin, Lars
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Kleverman, Mats
    Division of Solid State Physics, Lund University, Lund, Sweden.
    Seifert, Werner
    Division of Solid State Physics, Lund University, Lund, Sweden.
    Samuelson, Lars
    Division of Solid State Physics, Lund University, Lund, Sweden.
    Fu, Ying
    Phys. Electron. and Photonics, Department of Physics, Gothenburg University, Gothenburg, Sweden.
    Willander, Magnus
    Phys. Electron. and Photonics, Department of Physics, Gothenburg University, Gothenburg, Sweden.
    Intersubband photoconductivity of self-assembled InAs quantum dots embedded in InP2004Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 95, nr 4, s. 1829-1831Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The results from photoconductivity (PC) measurements on InAs dots embedded in InP are presented. The PC technique is recently applied to the study of InAs dots embedded in matrices of GaAs and Al0.3Ga0.7As matrix, respectively. It is demonstrated that this technique reveals important new physical insight into the electronic structure of the InAs/InP dots, information that cannot easily be obtained by other techniques.

  • 1242.
    Pettersson, Håkan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Trägårdh, Johanna
    Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
    Persson, Ann I.
    Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
    Landin, Lars
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Hessman, Dan
    Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
    Samuelson, Lars E.
    Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
    Infrared Photodetectors in Heterostructure Nanowires2006Ingår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 6, nr 2, s. 229-232Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report on spectrally resolved photocurrent measurements on single self-assembled nanowire heterostructures. The wires, typically 3 μm long with an average diameter of 85 nm, consist of InAs with a 1 μm central part of InAsP. Two different sets of wires were prepared with phosphorus contents of 15 ±3% and 35 ±3%, respectively, as determined by energy-dispersive spectroscopy measurements made in transmission electron microscopy. Ohmic contacts are fabricated to the InAs ends of the wire using e-beam lithography. The conduction band offset between the InAs and InAsP regions virtually removes the dark current through the wires at low temperature. In the optical experiments, interband excitation in the phosphorus-rich part of the wires results in a photocurrent with threshold energies of about 0.65 and 0.82 eV, respectively, in qualitative agreement with the expected band gap of the two compositions. Furthermore, a strong polarization dependence is observed with an order of magnitude larger photocurrent for light polarized parallel to the wire than for light polarized perpendicular to the wire. We believe that these wires form promising candidates as nanoscale infrared polarization-sensitive photodetectors.

  • 1243.
    Pettersson, Stefan
    et al.
    RISE Viktoria, Gothenburg, Sweden.
    Bjärsvik, Susanne
    Volvo Car Corporation, Gothenburg, Sweden.
    Englund, Cristofer
    RISE Viktoria, Gothenburg, Sweden.
    Eriksson, Robert
    Volvo Car Corporation, Gothenburg, Sweden.
    Koponen, Veikko
    Volvo Car Corporation, Gothenburg, Sweden.
    Kristiansson, Urban
    RISE Viktoria, Gothenburg, Sweden.
    Milding, Hans-Göran
    Volvo Car Corporation, Gothenburg, Sweden.
    Sundström, Christofer
    RISE Viktoria, Gothenburg, Sweden.
    Wedlin, Johan
    RISE Viktoria, Gothenburg, Sweden.
    Driving style comparison of plug-in hybrids and fossil fueled vehicles based on data collection of fast sampled signals2018Konferensbidrag (Refereegranskat)
  • 1244.
    Pignaton de Freitas, Edison
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Cooperative Context-Aware Setup and Performance of Surveillance Missions Using Static and Mobile Wireless Sensor Networks2011Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Surveillance systems are usually employed to monitor wide areas in which their usersaim to detect and/or observe events or phenomena of their interest. The use ofwireless sensor networks in such systems is of particular interest as these networks can provide a relative low cost and robust solution to cover large areas. Emerging applications in this context are proposing the use of wireless sensor networks composed of both static and mobile sensor nodes. Motivation for this trend is toreduce deployment and operating costs, besides providing enhanced functionalities.The usage of both static and mobile sensor nodes can reduce the overall systemcosts, by making low-cost simple static sensors cooperate with more expensive andpowerful mobile ones. Mobile wireless sensor networks are also desired in somespecific scenarios in which mobility of sensor nodes is required, or there is a specificrestriction to the usage of static sensors, such as secrecy. Despite the motivation,systems that use different combinations of static and mobile sensor nodes are appearing and with them, challenges in their interoperation. This is specially the case for surveillance systems.This work focuses on the proposal of solutions for wireless sensor networks including static and mobile sensor nodes specifically regarding cooperative andcontext aware mission setup and performance. Orthogonally to the setup and performance problems and related cooperative and context aware solutions, the goalof this work is to keep the communication costs as low as possible in the executionof the proposed solutions. This concern comes from the fact that communication increases energy consumption, which is a particular issue for energy constrained sensor nodes often used in wireless sensor networks, especially if battery supplied. Inthe case of the mobile nodes, this energy constraint may not be valid, since their motion might need much more energy. For this type of node the problem incommunicating is related to the links’ instabilities and short time windows availableto receive and transmit data. Therefore, it is better to communicate as little as possible. For the interaction among static and mobile sensor nodes, all thesecommunication constraints have to be considered.For the interaction among static sensor nodes, the problems of dissemination and allocation of sensing missions are studied and a solution that explores local information is proposed and evaluated. This solution uses mobile software agentsthat have capabilities to take autonomous decisions about the mission dissemination and allocation using local context information so that the mission’s requirementscan be fulfilled. For mobile wireless sensor networks, the problem studied is how to perform the handover of missions among the nodes according to their movements.This problem assumes that each mission has to be done in a given area of interest. In addition, the nodes are assumed to move according to different movement patterns,passing through these areas. It is also assumed that they have no commitment in staying or moving to a specific area due to the mission that they are carrying. To handle this problem, a mobile agent approach is proposed in which the agents implement the sensing missions’ migration from node to node using geographical context information to decide about their migrations. For the networks combining static and mobile sensor nodes, the cooperation among them is approached by abiologically-inspired mechanism to deliver data from the static to the mobile nodes.The mechanism explores an analogy based on the behaviour of ants building and following trails to provide data delivery, inspired by the ant colony algorithm. It is used to request the displacement of mobile sensors to a given location according tothe need of more sophisticated sensing equipment/devices that they can provide, so that a mission can be accomplished.The proposed solutions are flexible, being able to be applied to different application domains, and less complex than many existing approaches. The simplicity of the solutions neither demands great computational efforts nor large amounts of memory space for data storage. Obtained experimental results provide evidence of the scalability of these proposed solutions, for example by evaluatingtheir cost in terms of communication, among other metrics of interest for eachsolution. These results are compared to those achieved by reference solutions (optimum and flooding-based), providing indications of the proposed solutions’ efficiency. These results are considered close to the optimum one and significantly better than the ones achieved by flooding-based solutions.

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  • 1245.
    Pignaton de Freitas, Edison
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Binotto, A. P. D.
    Informatics Institute, Federal University of Rio Grande do Sul, Brazil.
    Pereira, Carlos Eduardo
    Informatics Institute, Federal University of Rio Grande do Sul, Brazil.
    Stork, A.
    Fraunhofer IGD / Technische Universität Darmstadt, Germany.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Dynamic Reconfigurable Task Schedule Support towards a Reflective Middleware for Sensor Network2008Ingår i: Proceedings of the 2008 International Symposium on Parallel and Distributed Processing with Applications: 10-12 December 2008, Sydney, NSW, Australia, Los Alamitos, Calif.: IEEE Computer Society, 2008, s. 886-891Konferensbidrag (Refereegranskat)
    Abstract [en]

    Sensor networks are being applied in several emerging sophisticated applications due to the use of powerful and high-quality sensor nodes, such as radars and visible light cameras. However, these nodes need additional features to optimally benefit from heterogeneous modern computing platforms. Therefore, reconfigurable computing is a potential paradigm for those scenarios as it can provide flexibility to explore the computational resources on that kind of high performance computing system. This paper presents a reconfigurable sensor node allocation support, based on application requirements, provided by a middleware focused on heterogeneous sensor networks. In order to address this concern, an aspect-orientation paradigm and intelligent agents approach is proposed followed by an UAV case study.

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  • 1246.
    Pignaton de Freitas, Edison
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Binotto, A. P. D.
    Informatics Institute, Federal University of Rio Grande do Sul, Brazil.
    Pereira, Carlos Eduardo
    Informatics Institute, Federal University of Rio Grande do Sul, Brazil.
    Stork, Andre
    Fraunhofer IGD / Technische Universität Darmstadt, Germany.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Dynamic Tasks' Reconfiguration for UAV System using Aspect Orientation2008Ingår i: International Symposium on Parallel and Distributed Processing with Applications, 2008. ISPA '08, Piscataway, N.J.: IEEE Press, 2008, s. 292-300Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many modern applications require high-performance platforms to deal with a variety of algorithms requiring massive calculations. Moreover, low-cost powerful hardware (e.g., GPU, PPU) and CPUs with multiple cores have become abundant, and can be combined in heterogeneous architectures. To cope with this, reconfigurable computing is a potential paradigm as it can provide flexibility to explore the computational resources on hybrid and multi-core desktop architectures. The workload can optimally be (re)distributed over heterogeneous cores along the lifecycle of an application, aiming for best performance. As the first step towards a run-time reconfigurable load-balancing framework, application requirements and crosscutting concerns related to timing play an important role for task allocation decisions. In this paper, we present the use of aspect-oriented paradigms to address non-functional application timing constraints in the design phase. The DERAF aspects’ framework is extended to support reconfiguration requirements; and a strategy for load-balancing is described. In addition, we present preliminary evaluation using an Unmanned Aerial Vehicle (UAV) based Surveillance System as case study.

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  • 1247.
    Pignaton de Freitas, Edison
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Heimfarth, Tales
    Computer Science Department, Federal University of Lavras, Lavras, Brazil.
    Netto, Ivayr Farah
    Computer Science Department, Federal University of Lavras, Lavras, Brazil.
    Pereira, Carlos Eduardo
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Ferreira, Armando Morado
    Defense Engineering Graduate Program, Military Institute of Engineering, Rio de Janeiro, Brazil.
    Wagner, Flavio Rech
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Handling Failures of Static Sensor Nodes in Wireless Sensor Network by Use of Mobile Sensors2011Ingår i: Proceedings - 25th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2011, Los Alamitos, Calif.: IEEE Press, 2011, s. 127-134Konferensbidrag (Refereegranskat)
    Abstract [en]

    Node failures in Wireless Sensor Networks composed by static sensor nodes are common due to the nature of the sensor devices and the usually harsh environments in which they are deployed. Node failures can diminish the performance of the network as a whole, thus affecting its functionality in delivering the desired services. For instance, significant regions can become uncovered due to failure of several nearby nodes. This paper reports a study about the use of mobile sensor nodes acting in cooperation with static ones in order to fill gaps created by faulty static nodes. The proposed fault handling mechanism presents alternative policies with pros and cons, depending on the user priorities imposed to the system and the occurrence of failures. A discussion about this topic is presented based on results obtained by simulation of the proposed mechanisms.

  • 1248.
    Pignaton de Freitas, Edison
    et al.
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil & Electrical Engineering Department, University of Brasilia, Brasilia, Brazil.
    Heimfarth, Tales
    Computer Science Department, Federal University of Lavras, 37200-000 Lavras, MG, Brazil.
    Rech Wagner, Flavio
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Pereira, Carlos Eduardo
    Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Exploring geographic context awareness for data dissemination on mobile ad hoc networks2013Ingår i: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 11, nr 6, s. 1746-1764Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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.

  • 1249.
    Pignaton de Freitas, Edison
    et al.
    Electrical Engineering Department, University of Brasília, Brazil.
    Heimfarth, Tales
    Department of Computer Science, Federal University of Lavras, CP 3037, Lavras 37200-000, Brazil.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Rech Wagner, Flavio
    Electrical Engineering Department and Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil .
    Pereira, Carlos Eduardo
    Electrical Engineering Department and Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil .
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Cooperation among wirelessly connected static and mobile sensor nodes for surveillance applications2013Ingår i: Sensors, E-ISSN 1424-8220, Vol. 13, nr 10, s. 12903-12928Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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.

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  • 1250.
    Pignaton de Freitas, Edison
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS). Instituto de Informática, Universidade Federal do Rio Grande do Sul, Brazil.
    Söderstam, Per
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Ourique de Morais, Wagner
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Pereira, Carlos Eduardo
    Instituto de Informática, Universidade Federal do Rio Grande do Sul, Brazil.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Adaptable middleware for heterogeneous wireless sensor networks2008Ingår i: Proceedings of the 10th European Agent Systems Summer School: Student Session / [ed] Tina Balke, Tobias Küster, 2008, s. 17-24Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The use of sensor networks in different kinds of sophisticated applications is emerging due to several advances in sensor technologies and embedded systems. However, the integration and coordination of heterogeneous sensors is still a challenge, especially when the target application environment is susceptible to changes that the system must track and adapt itself to in order to fulfil the users’ requirements. These changing scenarios require services being provided in different places during the system runtime, and to fulfil this, a support for adaptability is needed. In this paper we present some initial ideas to use multi-agents in a middleware that aims to provide the necessary support to sophisticated sensor network applications.

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