The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Routing Algorithm is an important mechanism which decides data transferring path in a network. Several existed routing algorithms are derived from a fundamental of graph theory with shortest path approach. A lot of additional network metrics were applied to serve the best quality of service (QoS) to end devices. However, a selected path from the existed algorithms can suffer from additional end-to-end...
In this information era, the number of websites in the Internet has dramatically increased over a few years. Any information and services can be retrieved from the website. However, the most valuable content of the website is still a text which is related to the topic or category of the websites. But there has only few researches focusing on categorizing Thai language information. The rest of researches...
The increasing quantity of the smartphones and their embedded sensors result in the increasing number of applications developed to serve users need. These applications require a solution to exchange their desired data. Although there are currently many types of wireless communication, these networks rely on infrastructure and cannot be scaled to support for incoming enormous requirement in internet...
In present, IEEE 802.11p is a standard for vehicle communication which can enhance quality of road transportation. The communication in non-line-of-sight is an important scenario that has to be inspected deeply. Because in non-line-of-sight or blind corner scenario, the signals may be obstructed. This reason would lead to communication loss, and be a big challenge for building safety applications...
Intelligent Transportation System enables various safety applications that rely on wireless ad hoc communication. The safety applications require fast dissemination, reliability, and restricted area dissemination so only important information will be delivered to the right vehicles. Not only a reliable broadcasting protocol is needed but also an ability of location awareness is required. Therefore,...
In the future, VANET and IEEE 802.11p will play important role in ITS with many applications that improve the quality of traffic. Road environment is one of factors that influences the performance of the wireless communication. Especially for blind corner, the buildings which obstruct the signal may be a big challenge for the data transmission of safety applications. Thus, the performance analysis...
The accretion of smartphone affects to a proliferation of demand in location service and system. A GPS is one of the famous technologies for localization because GPS can localize accurately when devices are outdoor. But when devices are indoor, GPS signal will be blocked by wall and roof. In order to create indoor localization system, there are many researches related to this topic. Most of previous...
Implementing Crowdsourcing in arrival time prediction system for public transportation lets people share their pieces of information that they have, such as the transport location or situation, and combine the information together to get the complete picture of the interesting public transportation. However, the system that requires human to input the information has critical problems, which are the...
Boat is one of the most popular vehicles for local people and tourists to travel in Bangkok, Thailand, since there is no traffic jam. Without accurate arrival time, however, boat becomes an inconvenient transportation since the waiting time can be varied from 10 minutes to an hour. In this paper, we propose a novel boat arrival time prediction system by using passengers' mobile phones. The system...
IEEE 802.11p is an approved amendment to the IEEE 802.11 standard and adds enhancements to 802.11 to be suitable for vehicular networks. Several researchers have evaluated the 802.11p in term of transmission range and propagation loss model. In this paper, we study a performance of a complex reliable broadcasting protocol on IEEE 802.11p in real public transport testbed. DECA, the density-aware reliable...
In this paper, we proposed a hybrid communication approach for disaster recovery system. Playing an important role in rescuing victims, the communication system in the disaster area is usually destroyed. The mobile ad-hoc network (MANET) can replace the original system. MANET can be deployed in the form of peer-to-peer (P2P) approach or infrastructure-based (IB) approach. However, both approaches...
In this paper, we propose effective trusted communication (ETC) using two-mode authentication. ETC combines routing protocol and authentication protocol together to provide trusted communication especially in disaster situations. During disasters, a communication system plays an important role in rescuing victims. Due to infrastructure failure, mobile ad-hoc networks (MANET) must be used. Since most...
Mobile phone has played an important role in daily life. Many applications on mobile phone can provide location service to user. A GPS sensor provides highly accurate localization system in outdoor environment but low accuracy over an indoor scenario because obstacles and mainly infrastructure of building block a GPS signal from GPS satellites. Moreover, GPS cannot determine a current floor that mobile...
Most work in vehicular ad hoc network focuses on an efficient mechanism to deliver data. These mechanisms need a beacon to exchange all necessary information between neighbors. Although a beacon is a small packet that is periodically broadcast to maintain accuracy, too much information can cause a bulky beacon. This leads to a contention problem due to limited resources in wireless networks. Many...
Vehicular ad hoc network (VANET) is challenging to deliver a query message for a requesting data efficiently when the topology of network keeps changing frequently and has many partitions. Many routing algorithms suffer from path breaks. Our work focuses on communication between vehicles to roadside unit stations by requesting data only one-hop communication from the requesting node. Routing algorithms...
Mobile phone is now becoming a necessary gadget in our daily life. Mobile applications have been proposed to advance the function of mobile phone. Location service application is a kind of mobile application that provides location information such as current location of the mobile phone. GPS is the popular technology for location service on mobile phone because many models of mobile phone are embedded...
Vehicular ad hoc network (VANET) is one type of wireless networks that uses moving vehicles as nodes in the network. In vehicular networks, it is challenging to transfer a query message for a requesting data efficiently when the destination node is out of transmission range from the requestor node. This is because many routing algorithms suffer from frequent path breaks when the vehicles are moving...
Congestion in DTNs happens when the forwarding path to destination does not exist and a node runs out of buffer space. Several works have shown that the situation is hard to mitigate. Consequently, to choose the right message to drop is a crucial task. Moreover, there has not been much attention to the buffer management policy in the Social-DTNs contexts. Therefore, an efficient buffer management...
Several prospective applications on vehicular networks have been defined. Most applications rely on beaconing mechanisms to broadcast the presence and updated information of a vehicle to surrounding neighbors. However, due to the broadcasting nature, no acknowledgement mechanism is provided. Therefore, vehicles do not perceive beacon collision if two or more vehicles simultaneously broadcast the beacons...
In this paper, we further evaluate our previously-proposed NewRAPID by comparing with TCP CUBIC and TCP RAPID in the following aspects: intra-protocol fairness, inter-protocol fairness, and convergence time. The result shows that TCP CUBIC provides more intra-protocol fairness than others because of its stability characteristic while TCP RAPID and TCP NewRAPID provide almost the same. Our designed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.