SUMMARY Modular multilevel converter (MMC) type topology is considered an enabling technology for expanding the voltage sourced converter (VSC) applications and thus providing its operational benefits with low switching power loss comparable to that of the conventional thyristor-based line commutated converters. However, due to its inherent topological and consequently control complexity, compu...

One general strategy for approximately solving large Markov decision processes is \divide-and-conquer": the original problem is decomposed into sub-problems which interact with each other, but yet can be solved independently by taking into account the nature of the interaction. In this paper we focus on a class of \policy-coupled" semi-Markov decision processes (SMDPs), which arise in many nons...

The frequency hopping (FH) based ultra-wideband (UWB) communication system divides its available frequency spectrum into several sub-bands, which leads to inherent disparities between carrier frequencies of each sub-band. Since the propagation loss is proportional to the square of the transmission frequency, the propagation loss on the sub-band having the highest carrier frequency is much large...

This study investigated the effects of hearing impairment and auditory vs. auditory-visual perception of lexical tone by native Thai hearing impaired listeners: Hearing Impaired with Hearing Aids (HI+HA), Hearing Impaired without Hearing Aids (HIHA), and Normal Hearing (NH). Adults’ discrimination of the 5 Thai tones was investigated in auditory-visual (AV), auditoryonly (AO), and visual-only (...

Speech recognition in reverberant environments is still a challenge problem. In this paper, we first investigated the reverberation effect on subband temporal envelopes by using the modulation transfer function (MTF). Based on the investigation, we proposed an algorithm which normalizes the subband temporal modulation spectrum (TMS) to reduce the diffusion effect of the reverberation. During th...

In the subband coding of images, directionality of image features has thus far been exploited very little. The proposed subband coding scheme utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional subband schemes at low bit rates, At comparable bit rates, the subjective image quality obtained by...

Full-duplex multi-way relaying is a potential solution for supporting high data rates in future Internet-of-Things (IoT) and 5G networks. Thus, in this paper the full-duplex MIMO multi-way channel consisting of 3 users (Y-channel) with M antennas each and a common relay node with N antennas is studied. Each user wants to exchange messages with all the other users via the relay. A transmission s...

Moving shadow detection is a challenging task in computer vision applications, such as surveillance, video conference, visual tracking, object recognition, and many other important applications. In this paper, region-based moving shadow detection using affinity propagation (RMSDAP) is presented, which detects shadows in terms of texture similarity. Firstly, we divide foreground image into no ov...

Key frame extraction is considered as one of the most critical issues in content-based video retrieval technology (CBVR). In this paper, an efficient key frame extraction algorithm based on unsupervised clustering and compressive sensing is proposed. Firstly, three types of filters with various scales are employed to generate high dimensional feature of each frame in one shot, which will be pro...