193 research outputs found
Quantisation mechanisms in multi-protoype waveform coding
Prototype Waveform Coding is one of the most promising methods for speech coding at low bit rates over telecommunications networks. This thesis investigates quantisation mechanisms in Multi-Prototype Waveform (MPW) coding, and two prototype waveform quantisation algorithms for speech coding at bit rates of 2.4kb/s are proposed. Speech coders based on these algorithms have been found to be capable of producing coded speech with equivalent perceptual quality to that generated by the US 1016 Federal Standard CELP-4.8kb/s algorithm. The two proposed prototype waveform quantisation algorithms are based on Prototype Waveform Interpolation (PWI). The first algorithm is in an open loop architecture (Open Loop Quantisation). In this algorithm, the speech residual is represented as a series of prototype waveforms (PWs). The PWs are extracted in both voiced and unvoiced speech, time aligned and quantised and, at the receiver, the excitation is reconstructed by smooth interpolation between them. For low bit rate coding, the PW is decomposed into a slowly evolving waveform (SEW) and a rapidly evolving waveform (REW). The SEW is coded using vector quantisation on both magnitude and phase spectra. The SEW codebook search is based on the best matching of the SEW and the SEW codebook vector. The REW phase spectra is not quantised, but it is recovered using Gaussian noise. The REW magnitude spectra, on the other hand, can be either quantised with a certain update rate or only derived according to SEW behaviours
Persistence probability of a random polynomial arising from evolutionary game theory
In this paper, we obtain an asymptotic formula for the persistence
probability in the positive real line of a random polynomial arising from
evolutionary game theory. It corresponds to the probability that a multi-player
two-strategy random evolutionary game has no internal equilibria. The key
ingredient is to approximate the sequence of random polynomials indexed by
their degrees by an appropriate centered stationary Gaussian process.Comment: revised versio
Cultures and Works of Tay People Through Vocative Words
Culture has a close relationship with many fields, including Linguistics. Language is a special product of culture. It is a means of communication and a tool for thinking. Language is a means to reflect, maintain and develop culture. Any meaningful sign of a language contains a cultural element. Vocative words are one of those cases. The article explores the vocative words system in the language of the Tay people in Tuyen Quang Province, Vietnam and concludes that culture is not only a factor that generates language, but also an environment for language to exist and develop. develop. Through the system of vocative words in the Tay language, it shows the cultural characteristics of respect affection of the Tay people
Determination of Fluoroquinolone antibiotics in sludge matrix using pressurized liquid extraction technique combined with high performance liquid chromatography/fluorescence detection
Joint Research on Environmental Science and Technology for the Eart
Mediating Effect of Social Commerce Continuance Use Intention on the Relationship Between Perceived Values and Brand Loyalty
The purpose of this paper is to examine the mediating effect of social commerce continuance use intention on the relationship between perceived values and brand loyalty in the social commerce context. The data was collected from 176 members of the Apple Watch Social Commerce site in Vietnam via an online questionnaire. Applying the structural equation modelling method, we found that social commerce continuance use intention has mediating effects on the relationship between perceived values and brand loyalty. Keywords: Perceived values, continuance use intention, brand loyalty, social commerce, Vietnam DOI: 10.7176/EJBM/12-11-07 Publication date: April 30th 202
Educating and training labor force Under Covid 19; Impacts to Meet Market Demand in Vietnam during Globalization and Integration Era
During integration and globalization era, Vietnam labor market face challenges but also have lots of
opportunities. This paper mainly use qualitative analysis with statistics, synthesis and inductive
methods, combine with dialectical materialism methods. Research results indicate that because many
Vietnam laborers do not have enough work skills and lack of training programs, they meet difficulties
on job; hence, human resource management need to deal with issues of improving skills and knowledge
for workforce to meet demand under EVFTA and Industry 4.0. There are lots of job opportunities from
banking, finance to manufacturing, industries. Last but not least, this study also propose some solutions
to deal with challenges in Human resources to meet demand from corporations. For instance, we need
to invest more on equipment and infrastructures, as well as quality of trainers for human resources of
training schools, so that Vietnam businesses can overcome challenges from EVFTA
Application of Regional Ocean Modeling System for hydrodynamics in Binh Cang-Nha Trang Bay, Vietnam
Based on the data collected at the Cau Da station, the Regional Ocean Modeling System (ROMS) is applied for hydrodynamics (e.g. circulation and temperature-salinity) in Binh Cang - Nha Trang Bay, Vietnam. The results present the several cases of hydrodynamic regimes in the Bay during two mainly monsoon seasons (northeast and southwest monsoons). The clearly hydrodynamic regime occurs in the bay due to the impacts of rivers and monsoon conditions. These changes could be contributed to the hydrodynamic systems and water exchanges, that support basic scientific information for sustainable development of Binh Cang - Nha Trang bay
Endoparasites in pigs raised in smallholder farms in Hung Yen province of Vietnam
As being part of an ongoing project, assessing animal health and food
safety risks in smallholder pig value chains in Hung Yen province of
Vietnam, the presence of endoparasites was investigated in a repeated
study. Three communes, with a total of 545 smallhoder pig farms, from
three districts were selected. In each commune, ten farms were
randomly chosen. On farm data including farm management and
biosecurity measures were recorded by using a checklist and observations.
From each farm, one pooled fecal sample was collected from a
randomly chosen barn monthly and followed from June to December
2014 for seven months. Fecal samples were analyzed for intestinal
parasites by floatation and sedimentation methods. The intensity of
most commonly seen parasites was determined by the McMaster
counting technique. In 198 collected fecal samples, six types of
parasites were detected, namely Eimeria 89 (44.95%), Ascaris suum 43
(21.72%), Strongyloides sp. 41 (20.71%), Trichocephalus suis 19 (9.60%),
Fasciolopsis buski 10 (5.05%), and Fasciola 2 (1.01%). Highest intensities
were observed for Eimeria (maximum 80900 oocyst/g), followed by
Ascaris suum (2400 egg/g), Strongyloides sp. (1900 egg/g), and Trichocephalus
suis (1300 egg/g); the others were reported at much lower
intensities. Infection levels and intensities of the parasites tended to be
higher during the hot months, June to September. No significant
difference between communes was found. At least one type of parasites
was present in 137 samples (69.19%). Most of farms (96.67%) were
positive for at least one type of parasites in at least one sample. There
was a significant difference in infection level of endoparasites between
biogas and non-biogas farms. The general high parasite burden
reported in this study will be addressed in future interventions which
will include parasite control apart from other measures
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