scholarly journals Environment perception based on LIDAR sensors for real road applications

Robotica ◽  
2011 ◽  
Vol 30 (2) ◽  
pp. 185-193 ◽  
Author(s):  
F. García ◽  
F. Jiménez ◽  
J. E. Naranjo ◽  
J. G. Zato ◽  
F. Aparicio ◽  
...  

SUMMARYThe recent developments in applications that have been designed to increase road safety require reliable and trustworthy sensors. Keeping this in mind, the most up-to-date research in the field of automotive technologies has shown that LIDARs are a very reliable sensor family. In this paper, a new approach to road obstacle classification is proposed and tested. Two different LIDAR sensors are compared by focusing on their main characteristics with respect to road applications. The viability of these sensors in real applications has been tested, where the results of this analysis are presented.

1937 ◽  
Vol 4 (3) ◽  
pp. A105-A108
Author(s):  
Hugh L. Dryden

Abstract A brief account is given of the principal concepts which have been utilized in the formulation of theories of the turbulent motion of fluids prior to 1935 and the new approach originated by G. I. Taylor in that year. A bibliography of 31 papers is included.


Geophysics ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. SM77-SM93 ◽  
Author(s):  
Tim T. Lin ◽  
Felix J. Herrmann

An explicit algorithm for the extrapolation of one-way wavefields is proposed that combines recent developments in information theory and theoretical signal processing with the physics of wave propagation. Because of excessive memory requirements, explicit formulations for wave propagation have proven to be a challenge in 3D. By using ideas from compressed sensing, we are able to formulate the (inverse) wavefield extrapolation problem on small subsets of the data volume, thereby reducing the size of the operators. Compressed sensing entails a new paradigm for signal recovery that provides conditions under which signals can be recovered from incomplete samplings by nonlinear recovery methods that promote sparsity of the to-be-recovered signal. According to this theory, signals can be successfully recovered when the measurement basis is incoherent with the representa-tion in which the wavefield is sparse. In this new approach, the eigenfunctions of the Helmholtz operator are recognized as a basis that is incoherent with curvelets that are known to compress seismic wavefields. By casting the wavefield extrapolation problem in this framework, wavefields can be successfully extrapolated in the modal domain, despite evanescent wave modes. The degree to which the wavefield can be recovered depends on the number of missing (evanescent) wavemodes and on the complexity of the wavefield. A proof of principle for the compressed sensing method is given for inverse wavefield extrapolation in 2D, together with a pathway to 3D during which the multiscale and multiangular properties of curvelets, in relation to the Helmholz operator, are exploited. The results show that our method is stable, has reduced dip limitations, and handles evanescent waves in inverse extrapolation.


The recent developments in wireless communication technologies along with the costs of hardware allow both V2V and V2I communications for information exchange. Such a network is called Vehicular ad Hoc Network (VANET) which is very important for various road safety and non-safety related applications. However, Due to the wireless nature of communication in VANETs, it is also prone to various security attacks which are originally present in wireless networks. Hence to realize the highest potential of VANET, the network should be free from attackers, there by all the information exchanged in the network must be reliable should be originated from authenticated source. The system can be processed by the fuzzy logic method. It does not require any keys for data transmission. The system design is very efficient compared to other techniques. So the users prevent from road accident and traffic jam.


2012 ◽  
pp. 277
Author(s):  
Pedro A. Fuertes-Olivera ◽  
Beatriz Pérez Cabello de Alba

Con el nombre de Inglés para Fines Específicos, mas conocido por el acrónimo inglés ESP, nos referimos a la variedad de la lengua inglesa que se enseña a los estudiantes matriculados en carreras como Económicas, Turismo, Medicina e Ingenierías. Desde sus inicios hasta la fecha hemos asistido a un gran crecimiento en el número de estudiantes y cursos ofertados, que ha obligado a poner en marcha prácticas docentes autónomas, es decir sin la participación de expertos en el campo, y replicativas, es decir prácticas que fueron inicialmente diseñadas para el aprendizaje de las destrezas profesionales, como por ejemplo el uso del estudio de casos procedente de los Masters of Business Administration (MBA). Ambos procesos, unidos al desarrollo del inglés como lingua franca y al interés por el desarrollo de una metodología que favorezca la autonomía de los estudiantes, se han traducido en un desarrollo espectacular de herramientas docentes de Internet. En este marco se sitúa este trabajo que se organiza en tres grandes apartados: (1) una precisión del concepto de ESP y una reinterpretación del mismo; (2) una revisión del concepto de lexicografía y del diccionario pedagógico; (3) una descripción de las posibilidades que ofrecen los diccionarios de Internet para poder leer textos de inglés empresarial/inglés económico. El artículo finaliza resumiendo las principales ideas defendidas en este trabajo.From its inception in the early 1960s, English for Specific Purposes (ESP) has grown to become one of the most prominent areas of EFL teaching. ESP is usually concerned with the teaching of English used in academic studies and/or professional activities, especially the teaching of English related with Business/Economics, Tourism, Medicine, and Engineering. As the number of courses and students has grown considerably the original team teaching methodology is being substituted by a more autonomous approach in which both ESP instructors and students have to acquire knowledge of the basic concepts of the field by themselves, as well as upgrade their discourse competence. This new approach lends support to recent developments in the field of learner’s autonomy, especially those based on Internet (for example, Moodle) that are being promoted in this era of shortages and lack of resources. Within this framework, this article offers a review of the state of art regarding ESP, formulates a reconceptualization of the concept with the aim of making room to two recent developments: the consolidation of English as lingua franca; and the possibilities offered by the Internet for teaching and learning. It also enumerates the main basic requirements of pedagogically-oriented specialised dictionaries and illustrates some of their potentialities for assisting users in a reading situation. The article finishes by summarising the main conclusions drawn.


Safety ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 60 ◽  
Author(s):  
Guido ◽  
Vitale ◽  
Astarita ◽  
Giofrè

Recently, many researchers have employed a microsimulation technique to study the chain of interactions among vehicles, which generates an accident occurrence in some circumstances. This new approach to studying road safety is named traffic conflict technique. The aim of this paper is to assess how the microscopic simulation is a useful tool to identify potentially unsafe vehicle interactions and how high-risk locations identified by a microsimulation technique are similar to the ones identified by using historical accident data. Results show that high-risk locations identified by the simulation framework are superimposable to those identified by using the historical accident database. In particular, the statistical analysis employed based on Pearson’s correlation demonstrates a significative correspondence between a risk rate defined with simulation and an accident rate determined by the observed accidents dataset.


2004 ◽  
Vol 13 (01) ◽  
pp. 19-28 ◽  
Author(s):  
MATTHIAS BRACK ◽  
CHRISTIAN AMANN ◽  
MIKHAIL PLETYUKHOV ◽  
OLEG ZAITSEV

We summarize recent developments of the semiclassical description of shell effects in finite fermion systems with explicit inclusion of spin degrees of freedom, in particluar in the presence of spin-orbit interactions. We present a new approach that makes use of spin coherent states and a correspondingly enlarged classical phase space. Taking suitable limits, we can recover some of the earlier approaches. Applications to some model systems are presented.


2016 ◽  
Vol 95 ◽  
pp. 8-19 ◽  
Author(s):  
Sahar Alian ◽  
R.G.V. Baker ◽  
Stephen Wood

1997 ◽  
Vol 06 (03) ◽  
pp. 365-395 ◽  
Author(s):  
Lefteri H. Tsoukalas

Anticipatory systems are systems whose change of state is based on information about present as well as future states. Planning and acting on the basis of anticipations of the future is an omnipresent feature of human control strategies, deeply permeating our daily experience and considered as the hallmark of natural intelligence. Yet, as the eminent mathematical biologist Robert Rosen has pointed out in his book Anticipatory Systems (1985), such control strategies are curiously absent from existing formal approaches to automatic control and decision-making processes. Recent developments in biology, ethology and cognitive sciences, however, as well as advancements in the technology of computer-based predictive models, compel us to reconsider the role of anticipation in intelligent systems and to the extent possible incorporate it in our formal approaches to control. Significant improvements in neural predictive computing when combined with the flexibility of fuzzy systems, supports the development of neurofuzzy anticipatory control architectures that integrate planning and control sequencing functions with feedback control algorithms. A review of the role of anticipation in intelligent systems and a new approach for neurofuzzy anticipatory control using radial basis neural predictive models and fuzzy if/then rules is presented.


1995 ◽  
Vol 19 (2-3) ◽  
pp. 245-252 ◽  
Author(s):  
J.H.A. Van Uden ◽  
A.H. Heijkamp
Keyword(s):  

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