Stochastic modeling of IEEE 802.11p output process for efficient V2X large-scale interworking

2017 ◽  
Author(s):  
Fatma Salem ◽  
Yassin Elhillali ◽  
Smail Niar
Keyword(s):  
Stochastic Modeling ◽  
Large Scale ◽  
Ieee 802.11P ◽  
Output Process

Automated extraction of Tree-Adjoining Grammars from treebanks

2005 ◽  
Vol 12 (3) ◽  
pp. 251-299 ◽  
Author(s):  
JOHN CHEN ◽  
SRINIVAS BANGALORE ◽  
K. VIJAY-SHANKER
Keyword(s):  
Stochastic Modeling ◽  
Stochastic Models ◽  
Large Scale ◽  
Automated Extraction ◽  
Tree Adjoining Grammar ◽  
Tree Adjoining Grammars

There has been a contemporary surge of interest in the application of stochastic models of parsing. The use of tree-adjoining grammar (TAG) in this domain has been relatively limited due in part to the unavailability, until recently, of large-scale corpora hand-annotated with TAG structures. Our goals are to develop inexpensive means of generating such corpora and to demonstrate their applicability to stochastic modeling. We present a method for automatically extracting a linguistically plausible TAG from the Penn Treebank. Furthermore, we also introduce labor-inexpensive methods for inducing higher-level organization of TAGs. Empirically, we perform an evaluation of various automatically extracted TAGs and also demonstrate how our induced higher-level organization of TAGs can be used for smoothing stochastic TAG models.

Stochastic modeling of large-scale solid-state storage systems

2013 ◽  
Vol 41 (1) ◽  
pp. 179-190 ◽  
Author(s):  
Yongkun Li ◽  
Patrick P.C. Lee ◽  
John C.S. Lui
Keyword(s):  
Solid State ◽  
Stochastic Modeling ◽  
Large Scale ◽  
Storage Systems

scholarly journals Efficient modelling of IEEE 802.11p MAC output process for V2X interworking enhancement

IET Networks ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 210-219 ◽  
Author(s):  
Fatma Salem ◽  
Yassin Elhillali ◽  
Smail Niar
Keyword(s):  
Ieee 802.11P ◽  
Output Process

scholarly journals Wi-Fi Direct Performance Evaluation for V2P Communications

2020 ◽  
Vol 9 (2) ◽  
pp. 28 ◽  
Author(s):  
Thales Teixeira de Almeida ◽  
José Geraldo Ribeiro Júnior ◽  
Miguel Elias M. Campista ◽  
Luís Henrique M. K. Costa
Keyword(s):  
Performance Evaluation ◽  
Simulation Model ◽  
Large Scale ◽  
Alternative Methods ◽  
Ieee 802.11P ◽  
Line Of Sight ◽  
Vehicle Speed ◽  
Vehicular Communication ◽  
Transmission Method ◽  
Packet Delivery

The high cost of IEEE 802.11p-compliant devices and the lack of a widely adopted standard motivate the search for alternative methods for vehicular communication. As a consequence, and due to the ubiquity of smartphones, we see an increasing number of proposals based on Wi-Fi Direct, especially related to the integration of pedestrians in VANETs. Nevertheless, given the complexity of real experimentation, it is difficult to assess the ability of Wi-Fi Direct to offer connectivity in the vehicular environment on a large scale, leading to the evaluation through simulation. In order to verify the ability of a simulation model of reproducing the Wi-Fi Direct behavior, we analyze the performance of a safety application based on the communication range, packet delivery rate, and packet inter-reception time. In V2P scenarios, with and without line of sight, with varying vehicle speed, measurements using smartphones are performed and their results compared with those of OMNeT++ simulator. The results indicate, apart from the simulator’s accuracy, that the connection establishment time hinders the use of Wi-Fi Direct as a replacement to 802.11p. As an outcome of this observation, we evaluate a new transmission method for Wi-Fi Direct based on beacon stuffing, which mitigates the long connection establishment issue.

scholarly journals Transmission Capacity Characterization in VANETs with Enhanced Distributed Channel Access

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 340 ◽  
Author(s):  
Wei Liu ◽  
Xinxin He ◽  
Zhitong Huang ◽  
Yuefeng Ji
Keyword(s):  
Large Scale ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Path Loss ◽  
Transmission Capacity ◽  
Ieee 802.11P ◽  
Small Scale ◽  
Channel Access ◽  
Transmission Scheme

The traditional research on the capacity of the Vehicular Ad Hoc Networks (VANETs) mainly lacks realistic models mimicking the behaviors of vehicles and the MAC protocol applied by IEEE 802.11p. To overcome these drawbacks, in this paper, the network transmission capacity analysis for VANETs is carried out from the perspective of the spatial geometric relationship among different vehicles. Specifically, the transmission scheme in this system is set to mimic enhanced distributed channel access (EDCA) protocol, in which the division of priorities is taken into account both the data type and the transmission distance requirement. Meanwhile, the moving pattern of vehicles is described as the classic car-following model according to realistic characteristics of VANET, and the propagation channel is modeled as a combination of large-scale path-loss and small-scale Rayleigh fading. Based on this model, the transmission opportunity under EDCA protocol is quantified and compared with that of CSMA/CA, and then the outage probability is calculated under the worst interfered scenario. Finally, the transmission capacity is thereby calculated and verified by the simulation results.

Stochastic modeling of large-scale flow in heterogeneous unsaturated soils

1991 ◽  
Vol 27 (7) ◽  
pp. 1447-1458 ◽  
Author(s):  
Donald J. Polmann ◽  
Dennis McLaughlin ◽  
Steve Luis ◽  
Lynn W. Gelhar ◽  
Rachid Ababou
Keyword(s):  
Stochastic Modeling ◽  
Unsaturated Soils ◽  
Large Scale ◽  
Large Scale Flow

EFFECTIVE GPU ACCELERATION OF LARGE SCALE, ASYNCHRONOUS SIMULATIONS ON GRAPHS

2012 ◽  
Vol 15 (08) ◽  
pp. 1250035
Author(s):  
DUSTIN ARENDT ◽  
YANG CAO
Keyword(s):  
Stochastic Modeling ◽  
Large Scale ◽  
Ad Hoc ◽  
General Purpose ◽  
Gpu Acceleration ◽  
Simulation Framework ◽  
Good Balance ◽  
Recent Emergence ◽  
Wide Range ◽  
Gpu Implementation

The recent emergence of GPGPU programming has resulted in a number of very efficient, but ultimately ad-hoc implementations of GPU accelerated simulations of complex systems. Because developing applications for the GPU is still a difficult and time consuming task, efficient GPU parallelizations of general purpose modeling frameworks are very useful. The dimer automaton is a stochastic modeling and simulation framework with a good balance of robustness, generality, and simplicity with capacity to model a wide range of phenomena. A major advantage of dimer automata is the ease in which they can be applied to any space that can be represented as a graph. Therefore, we have developed an efficient GPU implementation of dimer automata that runs up to 80 times faster than the serial implementation.

Stochastic modeling of large-scale transient unsaturated flow systems

1987 ◽  
Vol 23 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Aristotelis Mantoglou ◽  
Lynn W. Gelhar
Keyword(s):  
Stochastic Modeling ◽  
Large Scale ◽  
Unsaturated Flow ◽  
Flow Systems
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