Nitthita Chirdchoo

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Unlike terrestrial networks that mainly rely on radio waves for communications, underwater networks utilize acoustic waves, which have comparatively lower loss and longer range in underwater environments. However, the use of acoustic waves pose a new research challenge in the networking area. While existing network schemes for terrestrial sensor networks(More)
Although there are numerous time synchronization algorithms recently proposed for terrestrial wireless sensor networks, none of these could be directly applied to underwater acoustic sensor networks. This is because they typically assume that the propagation delay is negligible, which is not the case in underwater. Furthermore, the sensor nodes in(More)
Although there are many MAC protocols that have been proposed for terrestrial wireless networks with a wide variety of aspects, these protocols cannot be applied directly in underwater acoustic networks due to the channel’s uniqueness of having low data rate and long propagation delay. In order to achieve a high throughput, both characteristics must be(More)
Unlike the terrestrial wireless networks that utilize the radio channel, underwater networks use the acoustic channel, which poses research challenges in the medium access control (MAC) protocol design due to its low bandwidth and high propagation delay characteristics. Since most of the MAC protocols for wireless terrestrial networks have been designed(More)
Unlike in terrestrial sensor networks where the locations of destination nodes are often assumed to be fixed and accurately known, such assumptions are usually not valid in underwater sensor networks where the destination nodes tend to be mobile inherently, either due to their self-propelling capability, or due to random motion caused by ocean currents. As(More)
Most local freshwater prawn farmers in Thailand are currently relying their prawn production on a traditional farming approach, which requires highly-experienced farm manager, effort and time. By continuing with this inefficient approach, it is hard to improve the productivity, due to two main difficulties: (1) the difficulty in consistently maintaining the(More)
In bit-patterned media recording (BPMR) channels at ultra high areal densities, the inter-track interference (ITI) is extremely severe, which significantly degrades the system performance. The partial-response maximum-likelihood (PRML) technique that uses a one-dimensional (1D) partial response target might not be able to cope with this severe ITI,(More)
Voice over Internet Protocol (VoIP) technology has continually gained popularity and has been widely adopted for personal and enterprise usage over the past decade. This results from its capability of reducing the cost of a pricy phone bill while being able to increase the organization's productivity as a whole. The contribution of this work is to discuss(More)
This paper considers the problem of channel reservation schemes for reservation-based MAC protocols with different priorities in wireless communication networks. A framework for designing such channel reservation protocols based on p-persistent is introduced. This framework allows us to explore several different prioritization mechanisms which are devised(More)
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