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Alleviating sensor location error is essential for promoting the quality of various location based services. Compared with the existing approaches which utilize the calibrators with known locations, e.g., GPS, this paper investigates the calibration performance which uses only the measurements from sources in unknown locations. Since no reference information is involved, it is revealed in this paper...
In order to explore the effects of tone categories on the perception of Mandarin vowels, the present study investigated the perceptual performance of vowel continua, which contained three Mandarin vowels /a, ɤ, u/ under four different tone conditions (i.e. high-level, mid-rising, falling-rising, and high-falling tones). The results showed that there was a shift in the categorical boundaries of /a/-/ɤ/...
Recently, various 3-D talking heads have been applied to computer-aided language learning as a novel mode. However, there is a lack of objective evaluation of learners' perception of the talking head when learning Mandarin as a second language. This study used eye-tracking methodology to evaluate a multimodal 3-D Mandarin pronunciation tutor, in comparison with real human instructor. The pronunciation...
The 3D talking head has been developed fast, in which both external and internal articulators were demonstrated. For Mandarin pronunciation, the aspiration airflow is crucial to discriminate confusable Mandarin consonants. In this paper, we present a 3D talking head system for articulatory and aspiration animation with the use of EMA articulation data and airflow data simultaneously. The quantitative...
In cooperative localization, minimally constrained system (MCS) refers to the minimal number of global (continuous) constraints which are indispensable for deriving node absolute locations. This paper investigates the optimality and practicability of the MCS. After deriving an optimal MCS and proving that the optimality depends on the node ground truth locations, a geometric approach to construct...
The present project attempted to design the next generation electronic voice box by modifying the driving signal of the device. Two steps were involved in the project. The first step involved designing a working minishaker system using existing commercial miniature shaker system that functions similarly to an electrolarynx, but with variable driving signals (type and frequency). The second step involved...
A triggering circuit for realizing the automatically capturing lightning stokes image on transmission lines has been studied to effectively detect the optical radiation of lightning channel. Firstly the signal characteristics of lightning flashes and background light are discussed and the performance indexes of lightning triggers for designing are puts forward. Then, a photoelectric detection circuit...
Basing on the IEC's description of the typical actual lightning current, Shanghai Jiao Tong University developed the first set of continuous multi-component of lightning current simulation experiment system. This paper put forward a kind of continuous multi-pulse multi-waveform of actual lightning current impulse current test system's implementation method which conform to the IEC's typical lightning...
Despite the fact that perceptual evaluation of voice quality is considered as a gold standard for examining normal and pathological voice quality, the considerably high inter- and intralisteners variability still cannot be neglected. This is the result of a number of confounding factors such as listeners' perceptual bias, listeners' experience and type of rating scale being used. Currently, automatic...
The application of articulatory database in speech production and automatic speech recognition has been practiced for many years. The goal of the research was to build an articulatory database specifying in Chinese Mandarin production and to investigate its efficacy in speech animation. Carstens EMA AG501 device were respectively used to capture acoustic data and articulatory data. Also, a Microsoft...
Unilateral vocal fold paralysis (UVFP) can be managed by injection laryngoplasty using different implant materials. To observe the long-term results of hyaluronic injection for unilateral vocal fold paralysis, acoustical measures including the glottal to noise excitation (GNE), vocal fold excitation ratio (VFER), glottis quotient (GQ) and mel frequency cepstral coefficients (MFCC) were obtained from...
The present project attempted to design the next generation electronic voice box by modifying the driving signal of the device. Two steps were involved in the project. The first step involved designing a working minishaker system using existing commercial miniature shaker system that functions similarly to an electrolarynx, but with variable driving signals (type and frequency). The second step involved...
The spatial relations of vowels are traditionally depicted by using an acoustic quadrilateral. However, the accuracy of vowel chart has been controversial. In the present study, the lingual movements of different mandarin Chinese vowels were investigated using electromagnetic articulography (EMA, AG501) and the physiological equivalent of Chinese vowels was then developed and compared to the traditional...
Injection laryngoplasty using hyaluronic acid for patients of unilateral vocal fold paralysis (UVFP) is becoming more prevalent in Hong Kong. The present investigation explored the efficacy of the procedure by examining various acoustical measures. Both traditional perturbation analyses and nonlinear dynamical measures were used to assess the change in patients' voice quality between before, one month...
This paper reports a low-cost fabrication method of sensitivity-enhanced SERS substrate using nanoimprinting lithography. A PDMS elastomer with grating structure is deformed by compressing to achieve the better pitch for SERS substrate. Experimental results show that the sensitivity can be enhanced about three times by this method.
The present project involved the development of a novel interactive speech training system based on virtual reality articulation and examination of the efficacy of the system for hearing impaired (HI) children. Twenty meaningful Mandarin words were presented to the HI children via a 3-D talking head during articulation training. Electromagnetic Articulography (EMA) and graphic transform technology...
This paper describes the fabrication processes of a new type of metal-embedded photo-mask, which will be used in standard photolithography and for fabricating patterned sapphire substrates. This new metal-embedded photo-mask is prepared by metal contact printing lithography and therefore can easily achieve smaller feature size around or below 1 µm. Besides its easiness in fabricating and obtaining...
To improve the lightning protection of large floating roof oil tank, the process of floating roof tanks stroked by lightning is analyzed, and relevant tests have been developed according to the standards. Test results indicate that the major role of conductive film is to release lightning current rapidly, but the presence of conductive films has their counter-effect. As long as conductive film exists,...
A novel de-noising algorithm, based on adaptive neural-fuzzy inference system (ANFIS) is proposed for noise reduction of the lightning current online monitoring system. The paper presents the theory and the implement procedure of the fuzzy neural system. Comparisons among the traditional strategies, such as curve fitting (CF), wavelet transform (WT) methods and the proposed ANFIS strategy are carried...
Developmental dyslexia has usually been characterized as having difficulties learning grapheme-phoneme correspondence and applying the mappings. This study investigates form-sound awareness in Chinese reading-impaired children in terms of regularity, consistency and lexicality effects using event-related potentials (ERP) and time-frequency analysis (TFA). Preliminary data from two Cantonese-speaking...
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