Phongsak Keeratiwintakorn

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A location and tracking system becomes very important to our future world of pervasive computing, where information is all around us. Location is one of the most needed information for emerging and future applications. Since the public use of GPS satellite is allowed, several state-of-the-art devices become part of our life, e.g. a car navigator and a(More)
Due to broadcast nature of wireless radio transmission, security services are of paramount importance to protect information exchanged in a wireless network. However, providing security services increases the computation and hence energy consumption due to cryptographic algorithms. Energy tends to be a very limited resource for wireless devices operating on(More)
Telemedicine is a future trend of medical care due to the increasing cost of treatment and the aging of population around the world. Several telecommunication technologies are proposed for transferring medical data between a point of care and a hospital; however, full mobility of patients needed to be attached with wired monitoring devices is not provided.(More)
Wireless communication becomes important part of everyday life, and in the future, there will be new wireless technologies. Vertical handoff between networks with different wireless network interface becomes so important especially in mobile devices that move at high speed such as vehicles. The vertical handoff is required for a vehicle to connect to(More)
Security protocols in wired and wireless networks make use of computationally intensive cryptographic primitives and several message exchanges for authenticated key exchange at the session-level and data confidentiality and integrity at the packet level. Moreover, changes in connectivity require mobile stations to repeatedly authenticate themselves thereby(More)
The fuzzy path selection is a framework for mobile ad hoc networks in which inaccurate information is available for making a routing decision. The goal of our path selection process is to identify a shortest path and to prolong the connectivity of the networks, using minimum hops and node remaining power as our model cost. Under an assumption that a list of(More)
Due to the high cost of fossil-based energy, several methods are proposed to reduce the usage of the energy in logistics and fleet management to be even more. GPS tracking system is a common approach to get vehicle location information in real-time for fleet planning. We proposed a GPS tracking system called Goo-Tracking that is composed of commodity(More)
This paper focuses on Ad Hoc routing problems on IEEE 802.15.4 in which nodes' speeds and courses are different. The objective is to optimize the performance of the proactive OLSR routing protocol in terms of key metrics for real time services - End-to-End Delay and Throughput - within the selected stable-connecting route, in terms of the number of link(More)
Many capital cities in the world encounter the similar problem of traffic jam due to the population growth and the need for transportation. Bangkok, Thailand is one of the top cities with serious traffic jam. An inter vehicle communication was proposed to provide the real time road information to realize the intelligent transportation system (ITS) with the(More)
Vehicular Ad-hoc Network (VANET) is the road vehicle's communication network without a base station. For end-to-end communication between vehicles, a routing protocol is used to find a route based on link properties from one to another vehicle with specific requirements. In VANET, vehicles move at high speed, which makes topology changed all the time, often(More)