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- Aliahmadipour, Laya, et al.
(författare)
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On Hesitant Fuzzy Clustering and Clustering of Hesitant Fuzzy Data
- 2017
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Ingår i: Fuzzy sets, rough sets, multisets and clustering. - Cham : Springer. - 9783319475561 - 9783319475578 ; , s. 157-168
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Bokkapitel (refereegranskat)abstract
- Since the notion of hesitant fuzzy set was introduced, some clustering algorithms have been proposed to cluster hesitant fuzzy data. Beside of hesitation in data, there is some hesitation in the clustering (classification) of a crisp data set. This hesitation may be arise in the selection process of a suitable clustering (classification) algorithm and initial parametrization of a clustering (classification) algorithm. Hesitant fuzzy set theory is a suitable tool to deal with this kind of problems. In this study, we introduce two different points of view to apply hesitant fuzzy sets in the data mining tasks, specially in the clustering algorithms.
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| 2. |
- Bencheikh Lehocine, Chouaib, 1993, et al.
(författare)
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Sensitivity analysis of beamforming techniques for periodic broadcast V2V communication
- 2021
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Ingår i: Conference Record - Asilomar Conference on Signals, Systems and Computers. - 1058-6393. ; Volume 2021-October, s. 61-66
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Konferensbidrag (refereegranskat)abstract
- In this work, we extend the results of two previously proposed transmit beamforming techniques for periodic, broadcast, vehicle-to-vehicle communication with a common fixed broadcast period, to the scenario where vehicular users (VUs) use different, and potentially varying broadcast periods. The two techniques, analog beamforming network (ABN) of phase shifters and antenna switching network (ASN), were previously developed in accordance with a multiple antenna receiver that employs an analog combining network (ACN) of phase shifters. To accommodate the use of multiple broadcast periods, we propose the design of phase shifter parameters of ABN-ACN and ASN-ACN systems using a design period Td. Then, we analytically derive sets of broadcast periods that sustain optimality, in the sense that the sum signal-to-noise ratio (SNR) of Kconsecutive packets for any receiving VU is maximized. Next, we provide guidelines on how to set Td to ensure a sufficient granularity of the sets of optimal broadcast periods. Finally, we investigate using numerical computations the effect of certain design choices on the sensitivity of ABN/ASN-ACN systems to small variations of the broadcast period.
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| 4. |
- Bray, Matthieu, et al.
(författare)
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Recognition of gestures in the context of speech
- 2002
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Ingår i: 16th International Conference on Pattern Recognition, 2002. Proceedings..
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Konferensbidrag (refereegranskat)abstract
- The scope of this paper is the interpretation of a user's intention via a video camera and a speech recognizer In comparison to previous work which only takes into account gesture recognition, we demonstrate that by including speech, system comprehension increases. For the gesture recognition, the user must wear a colored glove, then we extract the velocity of the center of gravity of the hand. A Hidden Markov Model (HMM) is learned for each gesture that we want to recognize. In a dynamic action, to know if a gesture has been performed or not, we implement a threshold model below which the gesture is not detected. The off line tests for gesture recognition have a success rate exceeding 85% for each gesture. The combination of speech and gestures is realized using Bayesian theory.
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| 8. |
- Fonseca, Joana, et al.
(författare)
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Adaptive Sampling of Algal Blooms Using an Autonomous Underwater Vehicle and Satellite Imagery
- 2023
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Ingår i: 2023 IEEE Conference on Control Technology and Applications, CCTA 2023. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 638-644
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Konferensbidrag (refereegranskat)abstract
- This paper proposes a method that uses satellite data to improve adaptive sampling missions. We find and track algal bloom fronts using an autonomous underwater vehicle (AUV) equipped with a sensor that measures the concentration of chlorophyll a. Chlorophyll a concentration indicates the presence of algal blooms. The proposed method learns the kernel parameters of a Gaussian process model using satellite images of chlorophyll a from previous days. The AUV estimates the chlorophyll a concentration online using locally collected data. The algal bloom front estimate is fed to the motion control algorithm. The performance of this method is evaluated through simulations using a real dataset of an algal bloom front in the Baltic. We consider a real-world scenario with sensor and localization noise and with a detailed AUV model.
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| 9. |
- Ghasemi, Masoomeh, et al.
(författare)
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Thermodynamic assessment and binary nucleation modeling of Sn-seeded InGaAs nanowires
- 2017
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Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248 .- 1873-5002. ; 478, s. 152-158
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Tidskriftsartikel (refereegranskat)abstract
- We have performed a thermodynamic assessment of the As-Ga-In-Sn system based on the CALculation of PHAse Diagram (CALPHAD) method. This system is part of a comprehensive thermodynamic database that we are developing for nanowire materials. Specifically, the As-Ga-In-Sn can be used in modeling the growth of GaAs, InAs, and InxGa1−xAs nanowires assisted by Sn liquid seeds. In this work, the As-Sn binary, the As-Ga-Sn, As-In-Sn, and Ga-In-Sn ternary systems have been thermodynamically assessed using the CALPHAD method. We show the relevant phase diagrams and property diagrams. They all show good agreement with experimental data. Using our optimized description we have modeled the nucleation of InxGa1−xAs in the zinc blende phase from a Sn-based quaternary liquid alloy using binary nucleation modeling. We have linked the composition of the solid nucleus to the composition of the liquid phase. Eventually, we have predicted the critical size of the nucleus that forms from InAs and GaAs pairs under various conditions. We believe that our modeling can guide future experimental realization of Sn-seeded InxGa1−xAs nanowires.
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| 10. |
- Glavatskih, Sergei, et al.
(författare)
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Tribotronics : towards active tribology
- 2008
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Ingår i: Tribology International. - : Elsevier BV. - 0301-679X .- 1879-2464. ; 41:9-10, s. 934-939
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Tidskriftsartikel (refereegranskat)abstract
- A constant trend towards more compact mechanical systems with higher power densities and increased thermo-mechanical loads emphasises the importance of the development of new design approaches and novel tribological systems. Ignoring this may cause a significant slow down in technological and industrial development. Tribotronics or active tribology based on adaptive performance is thought of as being critical in the implementation of smart machine concepts. Recognition of the importance of tribotronics, or active control of system loss outputs, such as those through friction and wear will have significant beneficial economic consequences as a result of the associated accelerated rate of technological progress. These smart tribotronic systems can be embedded in a great variety of machines and mechanisms. If this integration is made at the design stage, products that are more flexible, efficient and reliable can be produced. The concept of tribotronics is presented and discussed in this paper. Some illustrativeexamples that show the feasibility of an “active†approach are given. In addition, various possibilities already reported in literature are discussed.
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