Rollover Warning of Articulated Vehicles Based on a Time-To-Rollover Metric

1999 ◽  
Author(s):  
Bo-Chiuan Chen ◽  
Huei Peng
Keyword(s):  
Real Time ◽  
The Other ◽  
Roll Angle ◽  
Vehicle Speed ◽  
Time Model ◽  
Whole Process ◽  
Articulated Vehicles ◽  
Articulated Vehicle ◽  
The One ◽  
Accuracy Problem

Abstract A Time-To-Rollover (TTR) metric is proposed as the basis to assess rollover threat for an articulated vehicle. Ideally, a TTR metric will accurately “count-down” toward rollover regardless of vehicle speed and steering patterns, so that the level of rollover threat is accurately indicated. To implement TTR in real-time, there are two conflicting requirements. On the one hand, a faster-than-real-time model is needed. On the other hand, the TTR predicted by this model needs to be accurate enough under all driving scenarios. An innovative approach is proposed in this paper to solve this dilemma and the whole process is illustrated in a design example. First, a simple yet reasonably accurate yaw/roll model is identified. A Neural Network (NN) is then developed to mitigate the accuracy problem of this simplified real-time model. The NN takes the TTR generated by the simplified model, vehicle roll angle and change of roll angle to generate an enhanced NN-TTR index. The NN was trained and verified under a variety of driving patterns. It was found that an accurate TTR is achievable across all the driving scenarios we tested.

scholarly journals Rollover Warning for Articulated Heavy Vehicles Based on a Time-to-Rollover Metric

2004 ◽  
Vol 127 (3) ◽  
pp. 406-414 ◽  
Author(s):  
Bo-Chiuan Chen ◽  
Huei Peng
Keyword(s):  
Neural Network ◽  
Simple Model ◽  
Design Process ◽  
The Other ◽  
Roll Angle ◽  
Heavy Vehicle ◽  
Vehicle Speed ◽  
Heavy Vehicles ◽  
The One ◽  
Accuracy Problem

A Time-To-Rollover (TTR) metric is proposed as the basis to assess rollover threat for an articulated heavy vehicle. The TTR metric accurately “counts-down” toward rollover regardless of vehicle speed and steering patterns, so that the level of rollover threat is accurately assessed. There are two conflicting requirements in the implementation of TTR. On the one hand, a model significantly faster than real-time is needed. On the other hand, the TTR predicted by this model needs to be accurate enough under all driving scenarios. An innovative approach is proposed in this paper to solve this dilemma and the design process is illustrated in an example. First, a simple yet reasonably accurate yaw∕roll model is identified. A Neural Network (NN) is then developed to mitigate the accuracy problem of this simple model. The NN takes the TTR generated by the simple model, vehicle roll angle, and change of roll angle to generate an enhanced NN-TTR index. The NN was trained and verified under a variety of driving patterns. It was found that an accurate TTR is achieved across all the driving scenarios we tested.

Optimal Camera Placement in a Virtual Environment

2021 ◽  
pp. 247-260
Author(s):  
Hocine Chebi
Keyword(s):  
Real Time ◽  
Virtual Environment ◽  
The Other ◽  
New Method ◽  
Camera Placement ◽  
Virtual Camera ◽  
Clear Vision ◽  
Transmission Of Information ◽  
The One ◽  
Visual Properties

Camera placement in a virtual environment consists of positioning and orienting a 3D virtual camera so as to respect a set of visual or cinematographic properties defined by the user. Carrying out this task is difficult in practice. Indeed, the user has a clear vision of the result he wants to obtain in terms of the arrangement of the objects in the image. In this chapter, the authors identify three areas of research that are relatively little covered by the literature dedicated to camera placement and which nevertheless appear essential. On the one hand, existing approaches offer little flexibility in both solving and describing a problem in terms of visual properties, especially when it has no solution. They propose a flexible solution method which computes the set of solutions, maximizing the satisfaction of the properties of the problem, whether it is over constrained or not. On the other hand, the existing methods calculate only one solution, even when the problem has several classes of equivalent solutions in terms of satisfaction of properties. They introduce the method of semantic volumes which computes the set of classes of semantically equivalent solutions and proposes a representative of each of them to the user. Finally, the problem of occlusion, although essential in the transmission of information, is little addressed by the community. Consequently, they present a new method of taking into account occlusion in dynamic real-time environments.

scholarly journals DoS Protection through Credit Based Metering - Simulation-Based Evaluation for Time-Sensitive Networking in Cars

10.29007/pxrk ◽  
2019 ◽  
Author(s):  
Philipp Meyer ◽  
Timo Häckel ◽  
Franz Korf ◽  
Thomas Schmidt
Keyword(s):  
Real Time ◽  
The Other ◽  
Dos Attacks ◽  
Promising Candidate ◽  
The Real ◽  
Simulation Based ◽  
Promising Solution ◽  
Attack Surface ◽  
The One ◽  
Audio Video

Ethernet is the most promising solution to reduce complexity and enhance the band- width in the next generation in-car networks. Dedicated Ethernet protocols enable the real-time aspects in such networks. One promising candidate is the IEEE 802.1Q Time- Sensitive Networking protocol suite. Common Ethernet technologies, however, increases the vulnerability of the car infrastructure as they widen the attack surface for many com- ponents. In this paper proposes an IEEE 802.1Qci based algorithm that on the one hand, protects against DoS attacks by metering incoming Ethernet frames. On the other hand, it adapts to the behavior of the Credit Based Shaping algorithm, which was standardized for Audio/Video Bridging, the predecessor of Time-Sensitive Networking. A simulation of this proposed Credit Based Metering algorithm evaluates the concept.

scholarly journals The Quick Growth of the Catholic Church in Manggarai: A Phenomenology of Conversion and Some Explanations

MELINTAS ◽  
2016 ◽  
Vol 31 (3) ◽  
pp. 276
Author(s):  
Fransiskus Borgias M.
Keyword(s):  
Social Services ◽  
Catholic Church ◽  
External Factor ◽  
The Other ◽  
The Political ◽  
Whole Process ◽  
Cultural Encounter ◽  
Cultural Life ◽  
The One ◽  
The Church

<p>Since the arrival of Christianity together with the colonial rulers, Manggarai, Flores, Indonesia, undergoes physical and spiritual changes. These changes can be explained with theory of intellectual voluntarism (the free will of the repentant) and theory of structural determinism (enforcement by external factor). It appears that the changes in Manggarai happen because of the mixture of both factors in their diverse variants, such as the political-economical, educational, social-services related, and religious-theological factors. There are two horizons in the whole process of encounter and transformation in this area. On the one hand, there is the horizon of European Christian missionaries (supported by government), and on the other hand, the horizon of the Manggarain, with their cultural life in the broadest sense of the word. The two horizons fuse to each other in one drama of cultural encounter throughout the growth of the Church. Following the hermeneutical discourse of Gadamer, it might be said that the fusion of the two horizons results in the emergence of a new face of unique local and contextual Christianity. In its uniqueness and locality, it has also something to be contributed to the universal Church.</p>

String Generation by Cellular Automata

2021 ◽  
Vol 30 (2) ◽  
pp. 111-132
Author(s):  
Martin Kutrib ◽  
◽  
Andreas Malcher ◽  
Keyword(s):  
Cellular Automata ◽  
Real Time ◽  
Structural Properties ◽  
The Other ◽  
Time Constraints ◽  
Closure Properties ◽  
Other Hand ◽  
The One

In contrast to many investigations of cellular automata with regard to their ability to accept inputs under certain time constraints, in this paper we are studying cellular automata with regard to their ability to generate strings in real time. Structural properties such as speedup results and closure properties are investigated. On the one hand, constructions for the closure under intersection, reversal and length-preserving homomorphism are presented, whereas on the other hand the nonclosure under union, complementation and arbitrary homomorphism are obtained. Finally, decidability questions such as emptiness, finiteness, equivalence, inclusion, regularity and context-freeness are addressed.

Evaluating the Roll Stability of Articulated Vehicles Using a Phase-Plane Analysis Method

2015 ◽  
Author(s):  
Tao Sun ◽  
Yuping He
Keyword(s):  
Angular Velocity ◽  
Phase Plane ◽  
Roll Angle ◽  
Phase Plane Analysis ◽  
Analysis Method ◽  
Threshold Values ◽  
Roll Control ◽  
Plane Analysis ◽  
Articulated Vehicles ◽  
Articulated Vehicle

An innovative phase-plane analysis method is proposed to assess the roll stability of articulation vehicles. It is well know that the roll instability of articulated vehicles is one of the most serious problems resulting in loss of life and property for drivers. Hence, it is necessary to develop active anti-roll systems to enhance the roll stability of articulated vehicle systems. In order to actuate the active anti-roll control for the articulated vehicle system, effectively threshold values should be determined. Conventionally, vehicle units’ lateral accelerations are used as the roll-over threshold values for active anti-roll control of articulated vehicles. Considering distinguished configurations and unique dynamic features of articulated vehicles, it is questionable whether the lateral-acceleration-based roll-over threshold of single vehicle is effective to evaluate the roll stability of articulated vehicles. In order to address the problem, case studies will be conducted to assess the roll stability of articulated vehicles using the phase-plane method. To this end, this paper will select a car-trailer system, which is represented by a nonlinear vehicle model generated using the CarSim software package. The phase-plane analysis method is used to examine the following relationships between: 1) the leading unit’s roll angle and roll angular velocity (ϕ – dϕ/dt) and 2) the trailing unit’s roll angle and roll angular velocity (ϕ′ – dϕ′/dt). Built upon the conventional phase-plane analysis method for single-unit vehicles, an innovative phase-plane analysis technique is developed in order to effectively assess the roll stability of articulated vehicles. The applicability and effectiveness of the newly developed technique is examined and demonstrated.

scholarly journals Système d'Information Intégré Adaptatif sous Web pour la gestion et la modélisation des ressources hydriques

2006 ◽  
Vol Volume 5, Special Issue TAM... ◽  
Author(s):  
F. El Dabaghi ◽  
M. Bechchi ◽  
H. Henine
Keyword(s):  
Information System ◽  
Real Time ◽  
Natural Extension ◽  
User Profile ◽  
The Other ◽  
Integrated Information System ◽  
Système D’Information ◽  
International Audience ◽  
Engine System ◽  
The One

International audience This work presents the Adaptative Integrated Information System under Web (AIISW) for the management of hydrous resources. The AIISW is a natural extension of the IISW-WADI towards an adaptative and customised architecture according to the user profile or the context of use including : a research and indexation engine system, simulators, a GIS and meshing editors as well as graphic viewers. This AIISW allows on the one hand to manage in an automatic way data of simulators and on the other hand to exploit and calibrate eventually in real time the results of these simulations by corroborating them with extracted or identified parameters. Ce travail présente le Système d'Information Intégré Adaptatif sous Web (SIIAW) pour la gestion des ressources hydriques. Le SIIAW est une extension naturelle du S2IW-WADI vers une architechture adaptative et personnalisée en fonction de l'utilisateur et du contexte d'utilisation incluant: un système de recherche et d'indexation, des codes de simulations, un SIG et des mailleurs ainsi que des visualiseurs graphiques. Ce SIIAW permet ainsi d'une part de manipuler de manière automatique les données des simulateurs et d'autre part d'exploiter et de caler éventuellement en temps réel les résultats de ces simulations en les corroborant avec des paramètres extraits ou identifiés.

Concurrency Control Protocol for Real-Time Database and the Analysis Base on Petri Net

2010 ◽  
Vol 143-144 ◽  
pp. 12-17
Author(s):  
Jun Chen ◽  
Yu Fen Wang ◽  
Jian Ping Wang
Keyword(s):  
Real Time ◽  
Petri Net ◽  
Concurrency Control ◽  
The Other ◽  
Time Limits ◽  
Control Protocol ◽  
Other Hand ◽  
Congestion Problems ◽  
Real Time Database ◽  
The One

In the article a new concurrency control protocol for real-time database (RTCC) is proposed. The protocol based on the traditional speculative concurrency control protocol (SCC). It dynamically establish the maximum of shadow to reasonably use the resources of system and add the quasi-commit phase to avoid many unnecessary restarting and enhance the concurrency of transaction. The theory of Petri net proof and results of experiment show that this protocol is feasible and effective , and it can meet the needs of real-time transaction. Speculative Concurrency Control is suitable especially for real-time database[1]. On the one hand, SCC is similar to PCC, to detect potentially harmful conflict as early as possible, so as to start a replacement schedule, thereby increasing the opportunities for transactions to meet time limits. On the other hand, SCC is similar to OCC, it allows the concurrency of conflict transaction and, therefore, avoids unnecessary matters that may affect the timely submission of delay. As a result, it alleviates the congestion problems and PCC restart OCC's problems, in order to better meet the transaction deadline. Based on the fact above mentioned, we propose a suitable real-time database concurrency control protocol [2,3] (RTCC: Concurrency Control protocol for Real-Time). The protocol of the SCC protocol on the traditional basis with a series of improvements can avoid a large number of unnecessary transaction restart and improve concurrency. Finally, by Petri net theory it can be proved feasible and correct.

scholarly journals Será a interface sintaxe-discurso necessariamente um locus de opcionalidade em L2? O caso da inversão locativa em inglês L2

2017 ◽  
pp. 347-386
Author(s):  
Joana Teixeira
Keyword(s):  
Real Time ◽  
Language Use ◽  
Contextual Information ◽  
The Other ◽  
L2 Acquisition ◽  
Intransitive Verb ◽  
Priming Task ◽  
European Portuguese ◽  
The One ◽  
Locative Inversion

This study investigates the acquisition of locative inversion in L1 European Portuguese (EP) – L2 English and L1 French – L2 English. Its purpose is to test two opposing hypotheses on the end-state of L2 acquisition at the syntaxdiscourse interface: the Interface Hypothesis (IH) and the L1+input Hypothesis (LIH). The former proposes that the syntax-discourse/pragmatics interface is a locus of residual, but permanent, optionality, because L2 speakers are less than optimally efficient at integrating syntactic and contextual information in real-time language use as a by-product of bilingualism. The latter, in contrast, sustains that structures at this interface generate problems at highly advanced levels of proficiency iff their properties are different in the L1 and the L2 and the evidence available in the input is not transparent (e.g., because the structure is rare). By administering 2 untimed drag and drop tasks, 2 speeded acceptability judgement tasks and 1 syntactic priming task to a total of 80 participants, we tested, on the one hand, the type of intransitive verb allowed in locative inversion and, on the other, the type of discourse context in which this inversion is admitted. The results disconfirm the LIH and confirm (most of) the IH’s predictions.

scholarly journals Adaptive Radial Basis Function Neural Network Controller for Autonomous Multirotors

2021 ◽  
pp. 112-118
Author(s):  
Afshin Banazadeh ◽  
◽  
Ardalan Samadzadeh
Keyword(s):  
Neural Network ◽  
Real Time ◽  
Basis Function ◽  
Rbf Neural Network ◽  
The Other ◽  
Data Types ◽  
Neural Network Controller ◽  
Network Controller ◽  
The One ◽  
High Level

Limits in the real-time computation of micro-processors on the one hand and high-level controllers that need precise computation in addition to implementation and compiling issues, on the other hand, have caused a great gap between control science and experiments. In this work, an adaptive RBF neural network controller is proposed to control the position and attitude of an autonomous multirotor. The controller is combined with an EKF observer and simulated in real-time flight conditions. In order to check the capabilities of the system, the proposed structure has been successfully applied to a quadrotor and a hexarotor using three data types for getting similar real-time flight results. Based on the results, the proposed structure has accomplished two separate missions with different scenarios, though there exists some error, especially in position estimations which are caused by step-wise characteristics of the desired path.

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