PEDESTRIAN POTENTIAL RISK WHILE CROSSING AT SIGNALIZED INTERSECTIONS

2016 ◽  
Vol 78 (5-2) ◽  
Author(s):  
Rizati Hamidun ◽  
Nurul Elma Kordi ◽  
Intan Rohani Endut ◽  
Siti Zaharah Ishak ◽  
Mohd Faudzi Mohd Yusof
Keyword(s):  
Risk Factors ◽  
Petri Nets ◽  
Potential Risk ◽  
Signalized Intersections ◽  
Signalized Intersection ◽  
Event Sequence ◽  
Road Section ◽  
Novel Approach ◽  
Pedestrian Accident ◽  
The Hierarchical Structure

Risk of pedestrian while crossing a road section may influence by several factors, including their crossing behaviors which might be difficult to be measured. In this paper, a model using Petri nets is introduced to consider the behavioral factors in measuring pedestrian risk. The crossing scenario of the pedestrian was observed to identify the pedestrian accident event. Sequence of event in pedestrian accident was modeled into Petri Nets elements. The model is designed in the hierarchical structure to consider risk factors related to human behavior, engineering and environment. The analysis of the model provides the numerical value of pedestrian potential risk as they crossed at a signalized intersection. The effect of each factor on the potential risk can be observed through sensitivity analysis.  The use of Petri Nets is a novel approach in predicting pedestrian potential risk through the modeling of pedestrian accident process.

AN MDP DECOMPOSITION APPROACH FOR TRAFFIC CONTROL AT ISOLATED SIGNALIZED INTERSECTIONS

2008 ◽  
Vol 22 (4) ◽  
pp. 587-602 ◽  
Author(s):  
René Haijema ◽  
Jan van der Wal
Keyword(s):  
Traffic Control ◽  
Dynamic Control ◽  
Signalized Intersections ◽  
Signalized Intersection ◽  
Value Iteration ◽  
Decomposition Approach ◽  
Traffic Lights ◽  
Novel Approach ◽  
Markovian Decision Process ◽  
One Step

This article presents a novel approach for the dynamic control of a signalized intersection. At the intersection, there is a number of arrival flows of cars, each having a single queue (lane). The set of all flows is partitioned into disjoint combinations of nonconflicting flows that will receive green together. The dynamic control of the traffic lights is based on the numbers of cars waiting in the queues. The problem concerning when to switch (and which combination to serve next) is modeled as a Markovian decision process in discrete time. For large intersections (i.e., intersections with a large number of flows), the number of states becomes tremendously large, prohibiting straightforward optimization using value iteration or policy iteration. Starting from an optimal (or nearly optimal) fixed-cycle strategy, a one-step policy improvement is proposed that is easy to compute and is shown to give a close to optimal strategy for the dynamic problem.

scholarly journals Modeling and Analysis of Connected Traffic Intersections Based on Modified Binary Petri Nets

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Omar Yaqub ◽  
Lingxi Li
Keyword(s):  
Petri Nets ◽  
Signalized Intersections ◽  
Signalized Intersection ◽  
Modeling And Analysis ◽  
Traffic Intersections

We propose an approach for the modeling and analysis of two connected traffic intersections based on Petri nets (PNs). We first use a PN to model an isolated four-way signalized intersection; then we extend it to model two successive signalized intersections. We find that this model has unbounded places, which in turn results in some confliction problems. Hence, we introduce the concept of modified binary petri nets (MBPNs) to overcome the limitation and resolve the confliction problem when we design our model and its controller. This MBPN model is a powerful tool and can be useful for the modeling and analysis of many other traffic applications.

A novel approach to examining personality risk factors of sexual offending in clergy applicants.

2020 ◽  
Vol 7 (4) ◽  
pp. 246-261
Author(s):  
Anthony Isacco ◽  
Paul B. Ingram ◽  
Katie Finn ◽  
John D. Dimoff ◽  
Brendan Gebler
Keyword(s):  
Risk Factors ◽  
Sexual Offending ◽  
Novel Approach

Premature Arterial Disease Associated with Familial Antithrombin III Deficiency

1990 ◽  
Vol 63 (01) ◽  
pp. 013-015 ◽  
Author(s):  
E J Johnson ◽  
C R M Prentice ◽  
L A Parapia
Keyword(s):  
Risk Factors ◽  
Venous Thromboembolism ◽  
Potential Risk ◽  
Antithrombin Iii ◽  
Arterial Disease ◽  
Coagulation System ◽  
Early Age ◽  
Arterial Thromboembolism ◽  
Potential Risk Factors ◽  
Antithrombin Iii Deficiency

SummaryAntithrombin III (ATIII) deficiency is one of the few known abnormalities of the coagulation system known to predispose to venous thromboembolism but its relation to arterial disease is not established. We describe two related patients with this disorder, both of whom suffered arterial thrombotic events, at an early age. Both patients had other potential risk factors, though these would normally be considered unlikely to lead to such catastrophic events at such an age. Thrombosis due to ATIII deficiency is potentially preventable, and this diagnosis should be sought more frequently in patients with arterial thromboembolism, particularly if occurring at a young age. In addition, in patients with known ATIII deficiency, other risk factors for arterial disease should be eliminated, if possible. In particular, these patients should be counselled against smoking.

Classification of Potential Risk Factors through HIRARC Method in Assessing Indoor Environment of Museums

2018 ◽  
Vol 10 (8) ◽  
Author(s):  
Syahrun Neizam Mohd Dzulkifli ◽  
◽  
Abd Halid Abdullah ◽  
Yee Yong Lee ◽  
Mohd Mahathir Suhaimi Shamsuri ◽  
...  
Keyword(s):  
Risk Factors ◽  
Potential Risk ◽  
Indoor Environment ◽  
Potential Risk Factors
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