Panichpapiboon, Sooksan

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School of Information Technology

sooksan.pa@kmitl.ac.th

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Connectivity requirements for vehicular networks with single-hop broadcasting
(2009-12-01)
Panichpapiboon, Sooksan
;
Pattara-Atikom, Wasan
In a vehicular ad hoc network (VANET), an information can generally be disseminated by using either a multi-hop broadcasting protocol or a single-hop broadcasting protocol. While in our earlier work we analyze the connectivity requirements in a network that employs a multi-hop broadcasting protocol, in this paper we extend our analysis to model the connectivity in a network that uses a single-hop broadcasting protocol. Our goal is to develop a model that is able to describe the relationship among the flow rate, the broadcast rate, and the network connectivity. As an initial step, in this paper, we determine the fundamental relation between the flow rate and the network connectivity. ©2009 IEEE.
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Characterization of Passenger Search Time Under Varying Supply-Demand Imbalance
(2026-08-01)
Panichpapiboon, Sooksan
Passenger search time is an essential variable in a street-hail taxi operation. Fundamentally, the statistical distributions of passenger search time form the basis of analytical and simulation models for describing the taxi system’s dynamics. To create accurate analytical and simulation models that realistically represent the dynamics of the actual taxi system, it is inevitable to characterize the type of statistical distributions that can effectively model the empirical distributions. While the probability distribution functions of passenger search time are critical elements of analytical and simulation models, their empirical distributions under different levels of supply-demand imbalance have not been characterized in any existing studies. In this paper, based on more than eight million real taxi trips in Bangkok, Thailand, and formal statistical analysis, we identify the probability distributions that can effectively model the empirical distributions of passenger search time under different levels of taxi supply-demand imbalance.
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Irresponsible forwarding under general inter-vehicle spacing distributions
(2011-08-12)
Panichpapiboon, Sooksan
Typically, vehicles in a self-organizing traffic information system distribute the information by rebroadcasting. Rebroadcasting results in redundant retransmission of the same information packet, leading to a useless occupation of the radio channel. Minimizing redundancy, while still guaranteeing complete reachability throughout the network, is a challenging task in multi-hop broadcasting. In our previous work, we introduced a new probabilistic-based broadcasting scheme, called Irresponsible Forwarding (IF), which could reduce the redundancy effectively. However, in the previous work, we only considered the scenario where the inter-vehicle spacing was exponentially distributed. In this paper, we generalize the concept of IF such that it can be applied to any inter-vehicle spacing distribution. © 2011 IEEE.
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Connectivity requirements for a self-organizing vehicular network
(2008-12-24)
Panichpapiboon, Sooksan
;
Pattara-Atikom, Wasan
In order to facilitate the traffic information dissemination in a self-organizing vehicular network, the network connectivity is required. In other words, a message from a source vehicle should be able to propagate and reach all of the vehicles on the road segment. Clearly, this requires the road segment to have a certain number of vehicles equipped with communication devices. It is a task of a system designer to determine the minimum number of vehicles (i.e., the minimum penetration) necessary to form a connected network as well as the critical transmission range required to provide such connectivity. In this paper, we present an analytical framework for determining the connectivity requirements in distributing traffic information in a self-organizing vehicular network. Both one-way and two-way street scenarios are considered. © 2008 IEEE.
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A review of information dissemination protocols for vehicular ad hoc networks
(2012-01-01)
Panichpapiboon, Sooksan
;
Pattara-Atikom, Wasan
With the fast development in ad hoc wireless communications and vehicular technology, it is foreseeable that, in the near future, traffic information will be collected and disseminated in real-time by mobile sensors instead of fixed sensors used in the current infrastructure-based traffic information systems. A distributed network of vehicles such as a vehicular ad hoc network (VANET) can easily turn into an infrastructure-less self-organizing traffic information system, where any vehicle can participate in collecting and reporting useful traffic information such as section travel time, flow rate, and density. Disseminating traffic information relies on broadcasting protocols. Recently, there have been a significant number of broadcasting protocols for VANETs reported in the literature. In this paper, we classify and provide an in-depth review of these protocols. © 2012 IEEE.
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Efficient broadcasting in IEEE 802.11 networks through irresponsible forwarding
(2009-12-01)
Busanelli, Stefano
;
Ferrari, Gianluigi
;
Panichpapiboon, Sooksan
In a self-organizing vehicular network, vehicles share and distribute information by rebroadcasting a received information packet to their neighbors. An efficient broadcast technique can offer a high reactivity without sacrificing the communication reliability. Therefore, broadcast techniques are particularly suitable for safety-related vehicular transmissions, whose goal is reaching reliably the widest area in the shortest time. Among the numerous solutions appeared in the literature, the probabilistic broadcast approaches seem to be promising and not yet accurately analyzed. Since the interaction between a high level broadcasting protocol with the lower layers cannot be ignored, in this work we analyze the behavior of a recently proposed broadcast technique, denoted as the Irresponsible Forwarding (IF), in IEEE 802.11 networks. Our attention concentrates on the Medium Access Control (MAC) layer, which is affected by some critical impairments for broadcasting, such as the hidden terminal problem and self-interference. In this work, we evaluate the benefits brought by the use of IF to perform efficient broadcasting in IEEE 802.11 networks.
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Time-headway distributions on an expressway: Case of bangkok
(2015-01-01)
Panichpapiboon, Sooksan
Traffic flow modeling is one of the fundamental keys to solving a traffic engineering problem. Among many parameters, time headway is frequently used to model traffic flow characteristics. A statistical analysis of time headways is immensely important to both theoretical traffic modeling and simulation-based traffic modeling. Basically, it allows researchers to describe an inherently random pattern of traffic flows. Past studies have mainly focused on the time headways of vehicles on highways, freeways, and arterials. However, studies of time headways on urban expressways are rather limited and still need further investigation. In this paper, the author investigates and characterizes the time-headway distributions of vehicles traveling on an urban expressway in Bangkok, Thailand. Particularly, the exponential distribution, the lognormal distribution, and the generalized extreme value (GEV) distribution are used to model the time headways. It is found that the GEV distribution is most effective in modeling time headways. In fact, the GEV distribution can describe more than 90% of the empirical distributions on most lanes and sections of the expressway. On the other hand, the exponential distribution is the least effective distribution. It can only describe the empirical distributions during the periods when the traffic is extremely light.
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Real-Time Vehicle Maneuvering Detection with Digital Compass
(2021-01-01)
Leakkaw, Puttipong
;
Panichpapiboon, Sooksan
Vehicle maneuverings are important pieces of information for many applications such as traffic incident detection and driving behavior recognition. On a macroscopic level, an unusually large number of some maneuvering events (e.g., lane changes) may suggest that a road incident occurs. On a microscopic level, vehicle maneuverings can tell how each individual person drives (e.g., safely or unsafely). A number of smartphone-based maneuvering detection methods have been proposed. However, most of them typically rely on accelerometer and gyroscope, and thus require the smartphone to be placed at a specific position on a vehicle and in a specific orientation. In this work, we take a rather different approach from most of the existing methods. Particularly, we investigate how effective it is to detect vehicle maneuverings by relying only on a signal from a digital compass on a smartphone. To this end, we introduce a simple rule-based maneuvering detection method which only takes the heading angles measured by the digital compass as inputs. This allows the smartphone to be placed freely at any position on the vehicle and in any orientation. Our results show that the digital compass can be used to detect turns and u-turns extremely well, and its accuracy on lane change detection is at an acceptable level.
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Irresponsible forwarding under real intervehicle spacing distributions
(2013-01-01)
Panichpapiboon, Sooksan
;
Cheng, Lin
One approach to the distribution of traffic information in a self-organizing traffic information system is multihop broadcasting. In this approach, each vehicle may simply rebroadcast an information packet that it receives from the others. However, rebroadcasting results in redundant retransmissions of the same information, leading to a useless occupation of the radio channel. Minimizing redundancy, while still guaranteeing reachability in the network, is a challenging task in multihop broadcasting. In our previous work, we introduced a new probabilistic-based broadcasting scheme, i.e., Irresponsible Forwarding (IF) , which could effectively reduce the redundancy. However, in the previous work, we only considered the scenario where the intervehicle spacing was exponentially distributed. In this paper, we generalize the concept of IF such that it can be applied to any intervehicle spacing distribution. In addition, we evaluate the performance of the IF protocol when it is applied in a realistic scenario (i.e., using real traffic traces). This paper shows that the IF protocol is able to limit packet redundancy all hours of the day effectively. © 1967-2012 IEEE.
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Lane Change Detection with Smartphones: A Steering Wheel-Based Approach
(2020-01-01)
Panichpapiboon, Sooksan
;
Leakkaw, Puttipong
Lane change is a valuable piece of traffic information. An abnormally high number of lane changes on a road section typically suggests that some lanes are blocked due to traffic incidents. Currently, the lane change information of vehicles on an urban road is typically obtained from over-roadway fixed sensors such as surveillance cameras. However, using fixed sensors has limitations in terms of cost and coverage. It is more effective to collect the lane change information directly from each individual vehicle. In addition, lane changing behavior of a driver can help assess his driving risk. One convenient way to detect a lane change directly from each vehicle is to take advantage of sensors on smart mobile devices such as smartphones. In this paper, we explore a new way to identify a lane change event based on a pattern of steering wheel angles detected by a smartphone. This is distinguishable from all of the existing steering wheel-based lane change detection methods, which need to retrieve the steering wheel angle signal from the On-board Diagnostic (OBD) port of the vehicle via the Controller Area Network-Bus (CAN-Bus). In addition, unlike others, our method does not require a lot of complex features to make an accurate detection. In fact, we demonstrate that a high level of accuracy can already be attained with a single simple feature called rotation span. Results show that the proposed detection method performs very well both in terms of precision and recall.

Panichpapiboon, Sooksan

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