Throat cancer treatment involves surgical removal of the tumor, leaving patients with facial disfigurement as well as temporary or permanent loss of voice. Surface electromyography (sEMG) generated from the jaw contains lots of voice information. However, it is difficult to record because of not only the weakness of the signals but also the steep skin curvature. This paper demonstrates the design of an imperceptible, flexible epidermal sEMG tattoo-like patch with the thickness of less than 10 μm and peeling strength of larger than 1 N cm −1 that exhibits large adhesiveness to complex biological surfaces and is thus capable of sEMG recording for silent speech recognition. When a tester speaks silently, the patch shows excellent performance in recording the sEMG signals from three muscle channels and recognizing those frequently used instructions with high accuracy by using the wavelet decomposition and pattern recognization. The average accuracy of action instructions can reach up to 89.04%, and the average accuracy of emotion instructions is as high as 92.33%. To demonstrate the functionality of tattoo-like patches as a new human-machine interface (HMI) for patients with loss of voice, the intelligent silent speech recognition, voice synthesis, and virtual interaction have been implemented, which are of great importance in helping these patients communicate with people and make life more enjoyable.
Esitetään Jyväskylän yliopiston informaatioteknologian tiedekunnan suostumuksella julkisesti tarkastettavaksi yliopiston Agora-rakennuksen auditoriossa 3 joulukuun 12. päivänä 2014 kello 13.Academic dissertation to be publicly discussed, by permission of the Faculty of Information Technology of the University of Jyväskylä, in building Agora, auditorium 3, on December 12, 2014 at 13 o'clock. In this thesis, the solutions for efficiently offering two types of typical services (voice based RT services and data based NRT services) were investigated for evolution of a future network system. For the voice service characterized by the low latency and the small packet size, VoIP over E-DCH associated with DPCCH gating and/or packet bundling in uplink has been investigated and proven in a compelling performance. Moreover, HS-SCCH-less operation in the downlink and the enhanced packet scheduler have been studied to further improve the user end-to-end experience. The tradeoff between reduction of CQI reports and the reliability of the link adaption has also been evaluated for consideration in performance optimization.
UNIVERSITYFor the data service, a hybrid network has been integrated using deviceto-device (D2D) communication into a LTE cellular network is envisioned and investigated as one potential solution. The various RRM schemes for mode selection, power control and resource allocation are studied, which are further complemented by a time hopping mechanism and the enhanced scheduler algorithm. Additionally, asymmetric D2D operation and semi-autonomous D2D were presented as different ways for D2D implementation. D2D based cluster operation was also studied for the potential of offering multicast services. The feedback mechanism for a multicast operation was discussed for assisting the cooperative D2D operation.In short, the VoIP based voice solutions and D2D based data solutions can be considered for future network evolution based on the studies in this thesis.
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