Sirindhorn International Institute of Technology

About: Sirindhorn International Institute of Technology is a based out in . It is known for research contribution in the topics: Supply chain & Combustion. The organization has 1048 authors who have published 1678 publications receiving 30067 citations.

Verifying Safety Messages Using Relative-Time and Zone Priority in Vehicular Ad Hoc Networks

Abstract: In high-density road networks, with each vehicle broadcasting multiple messages per second, the arrival rate of safety messages can easily exceed the rate at which digital signatures can be verified. Since not all messages can be verified, algorithms for selecting which messages to verify are required to ensure that each vehicle receives appropriate awareness about neighbouring vehicles. This paper presents a novel scheme to select important safety messages for verification in vehicular ad hoc networks (VANETs). The proposed scheme uses location and direction of the sender, as well as proximity and relative-time between vehicles, to reduce the number of irrelevant messages verified (i.e., messages from vehicles that are unlikely to cause an accident). Compared with other existing schemes, the analysis results show that the proposed scheme can verify messages from nearby vehicles with lower inter-message delay and reduced packet loss and thus provides high level of awareness of the nearby vehicles.

Developing an economic cost model for quantifying supply chain costs

Abstract: Supply Chain Management (SCM) has become a very powerful tool for any business because it aims to provide a win-win situation for all members by maximising the profitability of the whole chain. However, some benefits from joining the chain are difficult to quantify in monetary terms. If these benefits and savings of supply chain coordination cannot be detected, it would result in a productivity paradox and failure to justify the benefits of building trust and coordination in the supply chain. The proposed classification of supply chain costs with an economic cost model expands the cost concept beyond typical logistics costs by breaking overhead costs according to their cost centre and introducing opportunity cost to estimate the neglected cost of non-value added activities. With this proposed cost model, companies would be able to quantify hidden benefits and their savings as well as to realise the true costs if they choose to join and cooperate in the chain, whereas these savings would be ignored and overlooked by the traditional costing methods, resulting in the possibility of collaboration in such projects (of building the chain) being turned down.

Virtual reality application to aid civil engineering laboratory course: A multicriteria comparative study

Abstract: The social distancing measure imposed worldwide to combat the outbreak of the novel coronavirus has seen rapid adoption of technologies to support online education. Compared to traditional lecture-based courses, online teaching is particularly more challenging for laboratory courses where hands-on activities are essential to achieve the learning outcomes. To deal with this issue, the study presented in this paper was aimed to: (1) to develop a virtual reality (VR) application to aid a civil engineering laboratory course, and (2) to measure the potential of the VR-aided learning (VRAL) application in civil engineering education by assessing the learners' preferences toward VRAL compared to instructor-aided learning (IAL) and video-aided learning (VAL). Using the Analytic Hierarchy Process, a comparison was conducted with 21 civil engineering students from both undergraduate and graduate levels. The results indicated that VRAL was more preferable than VAL by the participants based on the aspects of “interactivity” (the ability to provide theoretical and practical learning environments to the learners), “cognitive interest” (the ability to drive learners to engage in learning activity), “ease of understanding the content” (the ability to provide a clear lecture interpretation, i.e., easy to understand), and “support for learning” (the ability to help learners to achieve the learning goal). Although VRAL was comparatively less preferable than IAL by the participants overall, it was viewed as better in terms of cognitive interest and “accessibility” (the ability to provide learners with better access to the learning approach in terms of time and location). Complementing previous research, the findings supported the benefits of VR applications to aid civil engineering education.