| 1. |
- Bengtsson, Lars, 1958-, et al.
(författare)
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Brains for Autonomous Robots : Hardware and Surgery Tools
- 1994
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Ingår i: Proceedings of PerAc '94. From Perception to Action. - Los Alamitos : IEEE. - 0818664827 - 9780818664823 ; , s. 436-439
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Konferensbidrag (refereegranskat)abstract
- This paper presents a hardware architecture and a software tool needed for future autonomous robots. Specific attention is given to the execution of artificial neural networks and to the need for a good inspection and visualization tool when developing this kind of systems. Achievable performance using state-of-the-art technology is estimated and module miniaturization issues are discussed. © 1994 IEEE.
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| 2. |
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| 3. |
- Bilstrup, Urban, 1971-, et al.
(författare)
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Knowledge Horizon - Dynamic limitations in a wireless ad hoc network
- 2003
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Ingår i: SNCNW 2003 Swedish National Computer Networking Workshop 2003 on-line proceedings. ; , s. 1-3
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Konferensbidrag (refereegranskat)abstract
- In this paper we investigate the impact of node mobility in a wireless ad hoc network (WAHN). Especially we investigate the possibility to provide guaranteed services in a WAHN, i.e., the network topology predictability. We combine link expiration time (LET) estimation with information propagation speed (IPS) in a time-space diagram and as result an operation area is revealed. The result gives that a WAHN, where the nodes are mobile, has a knowledge horizon (KH), the distance of which is dependent on the mobility of the nodes. Beyond the KH, knowledge about the network state is impossible to achieve. Thus, we can not predict long distance network topology state when the node mobility is high.
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| 4. |
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| 5. |
- Jonsson, Magnus, 1969-, et al.
(författare)
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Vision-based low-level navigation using a feed-forward neural network
- 1997
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Ingår i: Proc. International Workshop on Mechatronical Computer Systems for Perception and Action (MCPA'97), Pisa, Italy, Feb. 10-12. ; , s. 105-111
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Konferensbidrag (refereegranskat)abstract
- In this paper we propose a simple method for low-level navigation for autonomous mobile robots, employing an artificial neural network. Both corridor following and obstacle avoidance in indoor environments are managed by the same network. Raw grayscale images of size 32 x 23 pixels are processed one at a time by a feed-forward neural network. The output signals from the network directly control the motor control system of the robot. The feed-forward network is trained using the RPROP algorithm. Experiments in both familiar and unfamiliar environments are reported.
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| 6. |
- Nilsson, Björn, 1965-, et al.
(författare)
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An active backscatter wake-up and tag identification extraction protocol for low cost and low power active RFID
- 2010
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Ingår i: Proceedings of 2010 IEEE International Conference on RFID-Technology and Applications, RFID-TA 2010. - Piscataway, NJ : IEEE Press. - 9781424466986 - 9781424467006 ; , s. 86-91
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a Radio Frequency Identification (RFID) protocol used to wake up and extract the ID of every tag (or a subset thereof) within reach of a reader in an active backscatter RFID system. We also study the effect on tag energy cost and read-out delay incurred when using the protocol, which is based on a frequency binary tree. Simulations show that, when using the 2.45 GHz ISM band, more than 1500 tags can be read per second.With a population of 1000 tags, the average read-out delay is 319 ms, and the expected lifetime of the RFID tags is estimated to be more than 2.5 years, even in a scenario when they are read out very often.
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| 7. |
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| 8. |
- Nilsson, Björn, 1965-, et al.
(författare)
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The Effect of Introducing Carrier Sense in an Active RFID Protocol
- 2007
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Active Radio Frequency Identification (A-RFID) extends the functionality from the predecessor passive RFID trough adding a power source to the transponder device (device used on a product to identify it). This power source enables more advanced functions in the radio interface such as listening (doing a carrier sense) to the radio channel (carrier of data information) finding out if it is unengaged, and free to use. In this paper we study the carrier sense functionality and its effects in lowering the tag energy consumption. Simulation results show that the life time of a tag, in an A-RFID system, using carrier sense is more than doubled compared to one not using carrier sense. The increased lifetime of the tag is due to the lowered energy consumption caused by the improved throughput and the decreased payload delay, which in turn is thanks to using carrier sense and naturally then give a better utilization of the radio channel.
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| 9. |
- Nilsson, Kenneth, 1951-, et al.
(författare)
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A modular, massively parallel computer architecture for trainable real-time control systems
- 1993
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Ingår i: Control Engineering Practice. - Kidlington, Oxford : Pergamon Press. - 0967-0661 .- 1873-6939. ; 1:4, s. 655-661
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Tidskriftsartikel (refereegranskat)abstract
- A new system-architectural concept for trainable real-time control systems is based on resource adequacy both in processing and communication. Cyclically executing programs in distributed nodes communicate via a shared high-speed medium. Static scheduling of programs and communication implies that the maximum possible work-load can always be handled in a time-deterministic manner. The use of Artificial Neural Networks (ANN) algorithms and trainability implies a new system development strategy based on a Continuous Development paradigm. An implementation of the Architectural concept is presented. The communication speed is measured in Gbps and the access method is TDMA. An implementation of the system-development strategy is also presented. © 1993.
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| 10. |
- Ražanskas, Petras, 1987-, et al.
(författare)
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Predicting Blood Lactate Concentration and Oxygen Uptake from sEMG Data during Fatiguing Cycling Exercise
- 2015
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Ingår i: Sensors. - Basel : MDPI. - 1424-8220. ; 15:8, s. 20480-20500
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a study of the relationship between electromyographic (EMG) signals from vastus lateralis, rectus femoris, biceps femoris and semitendinosus muscles, collected during fatiguing cycling exercises, and other physiological measurements, such as blood lactate concentration and oxygen consumption. In contrast to the usual practice of picking one particular characteristic of the signal, e.g., the median or mean frequency, multiple variables were used to obtain a thorough characterization of EMG signals in the spectral domain. Based on these variables, linear and non-linear (random forest) models were built to predict blood lactate concentration and oxygen consumption. The results showed that mean and median frequencies are sub-optimal choices for predicting these physiological quantities in dynamic exercises, as they did not exhibit significant changes over the course of our protocol and only weakly correlated with blood lactate concentration or oxygen uptake. Instead, the root mean square of the original signal and backward difference, as well as parameters describing the tails of the EMG power distribution were the most important variables for these models. Coefficients of determination ranging from R2 = 0:77 to R2 = 0:98 (for blood lactate) and from R2 = 0:81 to R2 = 0:97 (for oxygen uptake) were obtained when using random forest regressors.
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| 11. |
- Razanskas, Petras, et al.
(författare)
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Time Domain Features of Multi-channel EMG Applied to Prediction of Physiological Parameters in Fatiguing Bicycling Exercises
- 2015
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Ingår i: Frontiers in Artificial Intelligence and Applications. - Amsterdam : IOS Press. - 0922-6389 .- 1879-8314. ; 278, s. 118-127
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Tidskriftsartikel (refereegranskat)abstract
- A set of novel time-domain features characterizing multi-channel surface EMG (sEMG) signals of six muscles (rectus femoris, vastus lateralis, and semitendinosus of each leg) is proposed for prediction of physiological parameters considered important in cycling: blood lactate concentration and oxygen uptake. Fifty one different features, including phase shifts between muscles, active time percentages, sEMG amplitudes, as well as symmetry measures between both legs, were defined from sEMG data and used to train linear and random forest models. The random forests models achieved the coefficient of determination R2 = 0:962 (lactate) and R2 = 0:980 (oxygen). The linear models were less accurate. Feature pruning applied enabled creating accurate random forest models (R2 >0:9) using as few as 7 (lactate) or 4 (oxygen) time-domain features. sEMG amplitude was important for both types of models. Models to predict lactate also relied on measurements describing interaction between front and back muscles, while models to predict oxygen uptake relied on front muscles only, but also included interactions between the two legs. © 2015 The authors and IOS Press. All rights reserved.
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| 12. |
- Svensson, Wolfgang, et al.
(författare)
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Optimizing the placement of microphones and loudspeakers in an aeroplane mounted active noise control system using stochastic search methods
- 1998
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Ingår i: Proceedings - National Conference on Noise Control Engineering. - : Inst Noise Control Eng, Poughkeepsie, NY, United States. - 0736-2935. ; , s. 283-288
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Tidskriftsartikel (refereegranskat)abstract
- In an aircraft the weight of the active noise control (ANC) system is a critical property. Therefore one aims at minimizing the number of microphones and loudspeakers. In doing so, only a reduced number of sensors and actuators may be used. Only recently has the relevance of placing sensors and actuators, in achieving a good global active noise control system, been considered. In this paper we will present two stochastic search methods for optimally placing the ANC-system -loudspeakers and -control microphones in a turboprop SAAB2000 aeroplane. The problem of optimal placement has not yet been showed to be analytically solvable. The number of possible configurations is large, indicating that stochastic search methods are strong candidates. In this work we show that genetic algorithms outperform simulated annealing in the case of the studied aeroplane. The method using genetic search also outperforms other known non stochastic methods.
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| 13. |
- Wiberg, Per-Arne, 1953-
(författare)
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Graphical programming of time-deterministic real-time systems
- 1996
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Ingår i: Second IEEE International Conference on Engineering of Complex Computer Systems. - Los Alamitos, Calif. : IEEE Computer Society. - 0818676140 ; , s. 173-180
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we present the Picasso programming language and the underlying design philosophy. Our goal is to provide programmers working with distributed embedded real-time systems with a tool to manage the complexity of this class of systems. The proposed tool allows easy and safe changes of the system software and hardware at any time during the lifetime of the system. This means that even during operation the system can be changed safely. This is not only important for enhancing the design process but is also necessary for a class of systems that need to be in service at all times. We have chosen to call this approach Change-Orientation. The most characteristic properties of the language are that it is graphical and that it shows time explicitly. All processing is described as functional transformations. These transformations are called processes. A very direct way of implementing a process is possible because the semantics of the description maps directly on the computation model of the processor.
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| 14. |
- Wiberg, Per-Arne, 1953-, et al.
(författare)
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Wireless Technology in Industry – Applications and User Scenarios
- 2001
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Ingår i: 2001 8th IEEE International Conference on Emerging Technologies and Factory Automation. - Piscataway, NJ : IEEE Press. - 0780372417 ; , s. 123-131
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Konferensbidrag (refereegranskat)abstract
- In this paper we draw a map of the wireless technology landscape, and place different industrial applications in this context. It is clear that in order to implement wireless communication in safety critical applications more research is needed. We describe one approach aiming at the very low bit error rates of these applications.
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