Kai-Juan Wong

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This paper introduces SpeckMAC, a novel low-power distributed, unsynchronised, random-access MAC protocol for a wireless mobile ad-hoc network of miniature specks called specknet. Two variations of the SpeckMAC protocol were compared theoretically with the well-known B-MAC protocol. All three MAC protocols were implemented on a larger speck prototype called(More)
This paper looks into the possibility of using the regular traffic patterns provided by public buses to improve the performance of Mobile Ad-hoc Networks (MANET) for Inter-vehicular communications systems (IVCS). MANET is an adhoc network with mobile nodes that are random and unpredictable. IVCS provide drivers and passengers with a range of services, and(More)
In this paper, the use of wireless vehicular sensor networks (VSN) were explored for the purpose of environmental monitoring. A prototype for the mobile sensor node that can be mounted onto vehicles, such as public buses, was introduced and from the experiments performed, it was demonstrated that the use of mobile vehicular sensors instead of static sensors(More)
Body sensor networks (BSNs) is a challenging research area that have attracted many researchers in recent times. Examples of BSN applications include those that are used to detect vital signs of the human body. As these body sensor devices are typically powered by batteries that are difficult to replace, energy efficient MAC protocols play an important role(More)
Emotion awareness has become one of the key characteristics in human-computer interactions in order to achieve more natural and intelligent communications. As an alternative channel for emotional communication, physiological signals have gradually earned attentions in the field of affective computing. Ever since Dr. Picard and colleagues brought forward the(More)
This paper describes a physical test-bed for evaluating the performance of MAC and networking algorithms targeted at a network of specks called the specknet. The Perspeckz-64 is a workbench available to researchers to conduct experiments remotely on an ensemble of up to 64 speck prototypes called the ProSpeckz. The firmware on the ProSpeckz can be(More)
In this paper, we propose a variable preamble length-based broadcasting scheme and compare it with a probability-based broadcasting scheme in a wireless sensor network environment. In our work, we show that in dense wireless sensor networks, broadcasting a packet with a small size preamble can give sufficient network-wide data dissemination and significant(More)
In this paper, we explore the use of wireless mesh networks (WMN) for the purpose of exchanging GPS raw data to support in-network processing of low-cost GPS devices. A proof of concept deployment with a small number of GPS stations is studied. This experiment validates the feasibility of using WMN to enable in-network processing in a dense GPS network.(More)
In this paper, we explore the use of wireless mesh networks (WMN) for the purpose of exchanging GPS raw data within GPS stations in a WMN to support real-time in-network processing of low-cost single-frequency GPS devices. A proof of concept deployment with a small number of GPS stations was studied. This experiment validates the feasibility of using WMN to(More)