Nguyen Trung Hieu

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Cyber-Physical Systems (CPS) are convergence of real physical world and computation world. CPS systems are rapidly becoming an important development strategies with broad application domains. The key requirements for CPS systems are to support multiple applications with many different resources at the same time in timeliness and also ensure energy(More)
This thesis examines techniques to improve the robustness of automatic speech recognition (ASR) systems against noise distortions. The study is important as the performance of ASR systems degrades dramatically in adverse environments, and hence greatly limits the speech recognition application deployment in realistic environments. Towards this end, we(More)
Resources used in a cloud data center could be spread across a large number of servers that are not fully utilized. This situation results in significant operational costs which are directly related to the power consumption of active servers. Virtual machine migration enables reducing the number of active servers by consolidating the load on a limited(More)
Virtual machine consolidation aims at reducing the number of active physical servers in a data center, with the goal to reduce the total power consumption. In this context, most of the existing solutions rely on aggressive virtual machine migration, thus resulting in unnecessary overhead and energy wastage. This article presents a virtual machine(More)
In Vietnam, nutrition interventions do not target school children despite a high prevalence of micronutrient deficiencies. The present randomised, placebo-controlled study evaluated the impact of providing school children (n 403) with daily multiple micronutrient-fortified biscuits (FB) or a weekly Fe supplement (SUP) on anaemia and Fe deficiency.(More)
Routing holes in wireless sensor networks (WSN) do occur due to several reasons, including cases caused by natural obstacles or disaster suffered areas. Computing the exact boundary of a hole is possible [5], but can be impractical with large holes. In this paper, we consider the problem of how to approximate a hole by a simplistic shape, covering polygon(More)
In this paper, we present a robust real-time sound source localization system implemented on a social robot platform developed in Institute for Infocomm Research, Singapore. The audio localization system provides the robot with auditory senses and enables the robot to direct its face to a speaker outside its frontal vision system. As the localization system(More)
Virtual machine (VM) placement is the process of selecting the most suitable server in large cloud data centers to deploy newly-created VMs. Several approaches have been proposed to find a solution to this problem. However, most of the existing solutions only consider a limited number of resource types, thus resulting in unbalanced load or in the(More)