Petcharat Suriyachai

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A number of wireless sensor network (WSN) applications demand timely data delivery. However, existing WSNs are designed to conserve energy and not to support timely data transmission. This paper shows how WSNs can be dimensioned, deployed and operated such that both reliable and timely data delivery is ensured while scarce energy is preserved. The presented(More)
Wireless Sensor Networks (WSNs) are generally designed to support applications in long-term deployments, and thus WSN protocols are primarily designed to be energy efficient. However, the research community has recently explored new WSN applications such as industrial process automation. These mission-critical applications demand not only energy efficient(More)
Currently, wireless sensor networks (WSNs) are not used in application scenarios that require timely reaction to sensor data for two main reasons. First, there is no exact method to dimension a wireless sensor network before deployment such that both delay and reliability are guaranteed. Second, most existing network components aim to be energy efficient(More)
Future application areas of wireless sensor networks (WSNs) may include industrial process automation, aircraft control systems or patient monitoring in hospitals. Such applications require predictable quality of service in terms of message transfer delay and reliability. Performance of WSN data transport is to a large extent defined by the employed medium(More)
It is difficult to design and operate a Wireless Sensor Network (WSN) that ensures timely data delivery. Hence, few time-critical WSNs are nowadays in operation despite numerous application scenarios that would benefit from such a system. This paper presents a novel dimensioning framework that can be used to efficiently construct WSNs for time-critical(More)
Some emerging applications of wireless sensor networks (WSNs) are time-critical, and in such scenarios data must be reliably delivered within a delay bound. A common approach to provide this strict delivery performance is to devise a medium access control (MAC) protocol, leading to the current plethora of MAC protocols in WSNs. In contrast to this(More)
In this research sodium bicarbonate (NaHCO3) was introduced to generate carbon dioxide gas (CO2) to the existing nitrogen gas (N2) of elastomeric foam, to lower thermal conductivity (K). Various loadings of NaHCO3 (0 to 60 phr) were added into the azodicarbonamide (AZC)-containing compound and its properties were then determined. Two vulcanization methods,(More)
Wireless sensor and actuator network (WSAN) applications are used in many critical scenarios. For instance, upon receiving an over-threshold pressure value, the control station of a gas separation plant issues a command to corresponding actuators to close gas valves to prevent a fire accident. In such control-loop systems, messages must be transported(More)
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