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Träfflista för sökning "L773:9781424427284 "

Sökning: L773:9781424427284

  • Resultat 1-10 av 17
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1.
  • Akan, Batu, et al. (författare)
  • Object Selection using a Spatial Language for Flexible Assembly
  • 2009
  • Ingår i: 14th IEEE International Conference on Emerging Technologies and Factory Automation, 2009. (ETFA 2009). - Mallorca, Spain. - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present a new simplified natural language that makes use of spatial relations between the objects in scene to navigate an industrial robot for simple pick and place applications. Developing easy to use, intuitive interfaces is crucial to introduce robotic automation to many small medium sized enterprises (SMEs). Due to their continuously changing product lines, reprogramming costs are far higher than installation costs. In order to hide the complexities of robot programming we propose a natural language where the use can control and jog the robot based on reference objects in the scene. We used Gaussian kernels to represent spatial regions, such as left or above. Finally we present some dialogues between the user and robot to demonstrate the usefulness of the proposed system.
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2.
  • Behnam, Moris, et al. (författare)
  • Improved SIRAP analysis for synchronization in hierarchical scheduled real-time systems
  • 2009
  • Ingår i: Proceedings of 14th IEEE International Conference on Emerging Techonologies and Factory (ETFA'09). - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • We present our ongoing work on synchronization in hierarchical scheduled real-time systems, where tasks are scheduled using fixed-priority pre-emptive scheduling. In this paper, we show that the original local schedulability analysis of the synchronization protocol SIRAP is very pessimistic when tasks of a subsystem access many global shared resources. The analysis therefore suggests that a subsystem requires more CPU resources than necessary. A new way to perform the schedulability analysis is presented which can make the SIRAP protocol more efficient in terms of calculated CPU resource needs.
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3.
  • Bouguerra, Abdelbaki, 1974-, et al. (författare)
  • An autonomous robotic system for load transportation
  • 2009
  • Ingår i: 2009 IEEE Conference on Emerging Technologies & Factory Automation (EFTA 2009). - New York : IEEE conference proceedings. - 9781424427277 - 9781424427284 ; , s. 1563-1566
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents an overview of an autonomous robotic material handling system. The goal of the system is to extend the functionalities of traditional AGVs to operate in highly dynamic environments. Traditionally, the reliable functioning of AGVs relies on the availability of adequate infrastructure to support navigation. In the target environments of our system, such infrastructure is difficult to setup in an efficient way. Additionally, the location of objects to handle are unknown, which requires that the system be able to detect and track object positions at runtime. Another requirement of the system is to be able to generate trajectories dynamically, which is uncommon in industrial AGV systems.
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4.
  • Hellström, Daniel, et al. (författare)
  • Exploring an open-loop RFID implementation in the automotive industry
  • 2009
  • Ingår i: [Host publication title missing]. - 1946-0759 .- 1946-0740. - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • This paper explores and describes the impact of radio frequency identification (RFID) technology on inventory accuracy within a production and assembly plant, and proposes a model for assessing the impact of the technology on inventory accuracy. The empirical investigation, based on case study research, focuses on a RFID implementation at a supplier of bumper and spoiler systems to the automotive industry. The results indicate that RFID ensures that inventory inaccuracy will be kept at minimum, providing practitioners with the opportunity to further eliminate waste and improve factory performance.
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5.
  • Hjertström, Andreas, 1972-, et al. (författare)
  • A Data-Entity Approach for Component-Based Real-TimeEmbedded Systems Development
  • 2009
  • Ingår i: 14th IEEE International Conference on Emerging Technology and Factory Automation. - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • In this paper the data-entity approach for efficientdesign-time management of run-time data in componentbasedreal-time embedded systems is presented. The approachformalizes the concept of a data entity which enabledesign-time modeling, management, documentationand analysis of run-time data items. Previous studies ondata management for embedded real-time systems showthat current data management techniques are not adequate,and therefore impose unnecessary costs and quality problemsduring system development. It is our conclusion thatdata management needs to be incorporated as an integralpart of the development of the entire system architecture.Therefore, we propose an approach where run-time datais acknowledged as first class objects during developmentwith proper documentation and where properties such asusage, validity and dependency can be modeled. In thisway we can increase the knowledge and understanding ofthe system. The approach also allows analysis of data dependencies,type matching, and redundancy early in the developmentphase as well as in existing systems.
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6.
  • Lidholm, Jörgen, et al. (författare)
  • Validation of Stereo Matching for Robot Navigation
  • 2009
  • Ingår i: 14th IEEE International Conference on emerging Technologies and Factory Automation ETFA 2009. - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • In this paper a new method is presented for evaluat- ing visual stereo matching. Features are extracted and stereo paired according to their vertical positions in the image, with constraints on the horizontal position, leaving only sane, possible pairs. From feature pairs landmarks are constructed. The landmarks are evaluated using mo- tion estimation from a complementary relative naviga- tion system like odometry, only landmarks calculated from correctly paired features should survive the motion, thus transferring the problem into three dimensional space.
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7.
  • Mashaei, Maziar, 1973, et al. (författare)
  • Optimal number of pallets for reconfigurable cyclic manufacturing plants
  • 2009
  • Ingår i: 2009 IEEE 14th International Conference on Emerging Technologies & Factory Automation, ETFA 2009, Mallorca, Spain. - 1946-0759. - 9781424427284 ; , s. 1-8
  • Konferensbidrag (refereegranskat)abstract
    • In a cyclic manufacturing system, the number of pallets in a handling and locating pallet system (HLPS) can have a huge effect on the production cycle time. The complexity of calculating the optimal number of pallets that satisfies the minimal cycle time poses a challenging design problem. In this paper the optimal solution is presented for deterministic cyclic manufacturing systems having determined schedule of tasks for multi-product applications. Furthermore, a specific domain which includes the optimal number of pallets is obtained for any arbitrary schedule of various product types in an HLPS. To verify the optimal solution, a reconfigurable Colored Petri Net (CPN) model is developed for a simple X85 pallet system. For various cases of machine processing times, the optimal number of pallets is obtained for the suggested framework.
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8.
  • Nemati, Farhang, Senior Lecturer, 1975-, et al. (författare)
  • Efficiently Migrating Real-Time Systems to Multi-Cores
  • 2009
  • Ingår i: 2009 IEEE Conference on Emerging Technologies & Factory Automation. - : IEEE. - 9781424427284 - 9781424427277 ; , s. 1205-1212
  • Konferensbidrag (refereegranskat)abstract
    • Power consumption and thermal problems limit a further increase of speed in single-core processors. Multi-core architectures have therefore received significant interest. However, a shift to multi-core processors is a big challenge for developers of embedded real-time systems, especially considering existing “legacy” systems which have been developed with uniprocessor assumptions. These systems have been developed and maintained by many developers over many years, and cannot easily be replaced due to the huge development investments they represent. An important issue while migrating to multi-cores is how to distribute tasks among cores to increase performance offered by the multi-core platform. In this paper we propose a partitioning algorithm to efficiently distribute legacy system tasks along with newly developed ones onto different cores. The target of the partitioning is increasing system performance while ensuring correctness.
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9.
  • Nemati, Farhang, Senior Lecturer, 1975-, et al. (författare)
  • Investigation of Implementing a Synchronization Protocol under Multiprocessors Hierarchical Scheduling
  • 2009
  • Ingår i: 2009 IEEE Conference on Emerging Technologies & Factory Automation. - : IEEE. - 9781424427277 - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • In the multi-core and multiprocessor domain, there has been considerable work done on scheduling techniques assuming that real-time tasks are independent. In practice a typical real-time system usually share logical resources among tasks. However, synchronization in the multiprocessor area has not received enough attention.In this paper we investigate the possibilities of extending multiprocessor hierarchical scheduling to support an existing synchronization protocol (FMLP) in multiprocessor systems. We discuss problems regarding implementation of the synchronization protocol under the multiprocessor hierarchical scheduling.
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10.
  • Pesonen, Joonas, et al. (författare)
  • Methodology and tools for controller-networking codesign in WirelessHART
  • 2009
  • Ingår i: ETFA 2009 - 2009 IEEE Conference on Emerging Technologies and Factory Automation. - : IEEE conference proceedings. - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • This paper describes a methodology for controller and communication scheduling co-design in control systems operating over wirelessHART networks. Data collection and dissemination operations are identified and scheduled to minimize the nominal communication latency. Techniques for improving the reliability of the network when link transmissions are unreliable are discussed, and a Markov-chain model for computing the latency distribution of data collection operations for a given schedule is proposed. The resulting latency models allow to represent the networked control loop as a jump-linear system, whose performance can be analyzed using techniques from stochastic control. We demonstrate how this framework can be used to co-design a networked LQG controller for a five-by-five MIMO control loop.
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