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Search Results: 1 - 10 of 36757 matches for " Tao Jiang "
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MAP-based Audio Coding Compensation for Speaker Recognition  [PDF]
Tao Jiang, Jiqing Han
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.23021
Abstract: The performance of the speaker recognition system declines when training and testing audio codecs are mismatched. In this paper, based on analyzing the effect of mismatched audio codecs in the linear prediction cepstrum coefficients, a method of MAP-based audio coding compensation for speaker recognition is proposed. The proposed method firstly sets a standard codec as a reference and trains the speaker models in this codec format, then learns the deviation distributions between the standard codec format and the other ones, next gets the current bias via using a small number adaptive data and the MAP-based adaptive technique, and then adjusts the model parameters by the type of coming audio codec format and its related bias. During the test, the features of the coming speaker are used to match with the adjusted model. The experimental result shows that the accuracy reached 82.4% with just one second adaptive data, which is higher 5.5% than that in the baseline system.
The Numerical Simulation of Gas Turbine Inlet-Volute Flow Field  [PDF]
Tao Jiang, Kezhen Huang
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.34023

The structural and aerodynamic performance of the air inlet volute has an important influence on the performance of the gas turbine. On one hand, it requires the airflow flowing through inlet volute as even as possible, in order to reduce the pressure loss, to avoid a decrease in the effective output power and an increase of the fuel consumption rate of the internal combustion engine which indicate the inefficiency of the entire power unit; On the other hand, it requires the size of the inlet volute to be as small as possible in order to save mounting space and production costs. The thesis builds the structure model and develops flow fields numerical simulation of several different sizes of the inlet volutes. Further, the unreasonable aerodynamic structure is improved according to the flow field characteristics and thereby, a better aerodynamic performance of the inlet volute is obtained.

Nickase-dependent isothermal DNA amplification  [PDF]
Yan He, Tao Jiang
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.44070

We developed a nicking endonuclease dependent DNA amplification (NDA), using Nt.BstNBI to catalyze single-stranded nick on double-stranded DNA, and Bst DNA polymerase to make extension while sealing the nick and displacing the downstream strand. The displaced single-stranded DNA thereby serves as template for primers hybridization and extension, resulting in exponential synthesis of target DNA under isothermal condition. Over 105 folds target DNA amplification can be achieved in 30 minutes, generating DNA product suitable for both diagnosis and DNA cloning. This NDA strategy does not require thermal cycling or prerequisite nucleotides modification, making it suitable for application in the field and at the point-of-care.

The Influence Factors Study of Aerosol Particles  [PDF]
Tao Jiang, Wu Wei
Modern Mechanical Engineering (MME) , 2013, DOI: 10.4236/mme.2013.32014

The marine and coastal intake filtration device is mainly used to filter out the salt spray aerosol particles. So, the laboratory studies of the intake filtration device need to simulate the salt spray aerosols state of the ocean environment. But the distribution of ocean salt spray aerosol particle of diameter is very wide, so the simulation device of salt spray aersol should produce a variety of salt spray aerosol particles. The paper is to mainly study the influencing factors of salt spray aerosol device to produce different particles diameter. And the investigation and study mainly include two aspects: numerical simulation and experimental study.

Ruin Probability with Constant Interest Force and Negatively Dependent Insurance Risks
Tao Jiang
Lecture Notes in Engineering and Computer Science , 2009,
Finite-time Ruin Probability of Renewal Model with Risky Investment and Subexponential Claims
Tao Jiang
Lecture Notes in Engineering and Computer Science , 2009,
Ruin Probability for Non-standard Poisson Risk Model with Stochastic Returns
Tao Jiang
Lecture Notes in Engineering and Computer Science , 2009,
Removal of Heavy Metal from Contaminated Soil with Chelating Agents  [PDF]
Wei Jiang, Tao Tao, Zhi-Ming Liao
Open Journal of Soil Science (OJSS) , 2011, DOI: 10.4236/ojss.2011.12010
Abstract: Removal of copper and nickel by the addition of the biodegradable chelating agent, chitosan and ethylenediamine tetraacetic acid (EDTA), was investigated, alongside the reaction of a reference compound sodium citrate for comparison. The artificial-contaminated soils were used in this study. The experiments showed that the extraction ability for copper and nickel from the contaminated soil decreased as follows: chitosan > EDTA > sodium citrate. The pH value of the eluents is the key to control the extraction, especially to chitosan solution. It was evident that the chitosan solution was the most efficient when the pH value was 3 - 3.5, the rate of extraction of copper being 43.36% and of nickel being 37.07%. And the best match of concentration and liquid/solid was 0.3 g/L and 10 mL/g.
Pace of Expansion and FDI Performance: The Case of Auto FDIs in China  [PDF]
Qing Jiu Tao, Rui Hua Jiang
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.410067

How fast do firms expand in a foreign market after their initial entry? Is faster better? Under what conditions is it beneficial or detrimental for a firm to move fast in a foreign market? This paper attempted to answer these questions by investigating the relationship between a firm’s pace of post-entry foreign expansion and its market share performance in a foreign market. The study is an attempt at filling a gap in the existing international business literature. Numerous researches have studied various point-of-entry decisions such as why (motivations), how (entry modes), where (location choices), and when (entry timing) firms make foreign entries. Studies have also investigated the consequences of internationalization, i.e., the relationship between degree of internationalization and firm performance. However, little is known about what happens after initial entry into a foreign market and before firms reach a certain degree of international diversity. As a step towards understanding the internationalization process, this study explores one important characteristic of post-entry foreign expansion—pace of expansion and its performance implications. Opposing hypotheses are developed from the perspectives of industrial organizational economics, and that of organizational learning, the resource-based view of the firm, and internationalization theory. The post-entry experiences of 214 foreign firms in China’s automobile market were examined in our sample. Results from multivariate regression show that greater firm performance is associated with greater expansion frequency and expansion magnitude. Furthermore, we found the inverted U shape relationship between expansion frequency and firm performance. J-shaped relationship between expansion magnitude and firm performance was also identified. We conclude this paper with implications for theory, research and management practice.

Exploring Human Activity Patterns Using Taxicab Static Points
Tao Jia,Bin Jiang
ISPRS International Journal of Geo-Information , 2012, DOI: 10.3390/ijgi1010089
Abstract: This paper explores the patterns of human activities within a geographical space by adopting the taxicab static points which refer to the locations with zero speed along the tracking trajectory. We report the findings from both aggregated and individual aspects. Results from the aggregated level indicate the following: (1) Human activities exhibit an obvious regularity in time, for example, there is a burst of activity during weekend nights and a lull during the week. (2) They show a remarkable spatial drifting pattern, which strengthens our understanding of the activities in any given place. (3) Activities are heterogeneous in space irrespective of their drifting with time. These aggregated results not only help in city planning, but also facilitate traffic control and management. On the other hand, investigations on an individual level suggest that (4) activities witnessed by one taxicab will have different temporal regularity to another, and (5) each regularity implies a high level of prediction with low entropy by applying the Lempel-Ziv algorithm.
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