An Nguyen
Ho Chi Minh city University of Economics, Banking and Finance, Graduate Student
Dispersed fluorescence spectra for S0 to S1 vibronic transitions in anthracene are computed using the semiempirical QCFF/PI approach plus corrections resulting from fits to experimental spectral intensities. Extensive comparisons are made... more
Dispersed fluorescence spectra for S0 to S1 vibronic transitions in anthracene are computed using the semiempirical QCFF/PI approach plus corrections resulting from fits to experimental spectral intensities. Extensive comparisons are made with the experimental jet spectra. The nature and assignment of low lying levels are clarified within the normal mode picture, whereas higher energy spectra are shown to be considerably broadened by low order anharmonic corrections.
Research Interests:
Abstract In this paper, we present a system for recognizing Vietnamese document images and propose a method to increase the accuracy for this system. Based on features of Vietnamese language, we can minimize the number of characters and... more
Abstract In this paper, we present a system for recognizing Vietnamese document images and propose a method to increase the accuracy for this system. Based on features of Vietnamese language, we can minimize the number of characters and integrate spell-checking in the ...
Research Interests: Information Technology, Linguistics, Vietnamese Language, Probability, Hidden Markov Models, and 13 moreDocument Analysis, Dictionary, Word Frequency, hidden Markov model, Frequency, Image recognition, Hmm, Predictive models, Dictionaries, Language Model, Statistical models, Statistical Model, and Post Processing
In this paper, we propose an approach based on HMM and linguistics for the Vietnamese recognition problem, including handwritten and speech recognition. The main contribution is that our method could be used to model all Vietnamese... more
In this paper, we propose an approach based on HMM and linguistics for the Vietnamese recognition problem, including handwritten and speech recognition. The main contribution is that our method could be used to model all Vietnamese isolated words by a small number ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
The development of efficient hydrogen evolving electrocatalysts that operate near neutral pH in aqueous solution remains of significant interest. A series of low-valent iron clusters have been investigated to provide insight into the... more
The development of efficient hydrogen evolving electrocatalysts that operate near neutral pH in aqueous solution remains of significant interest. A series of low-valent iron clusters have been investigated to provide insight into the structure-function relationships affecting their ability to promote formation of cluster-hydride intermediates and to promote electrocatalytic hydrogen evolution from water. Each of the metal carbonyl anions, [Fe4N(CO)12](-) (1(-)), [Fe4C(CO)12](2-) (2(2-)), [Fe5C(CO)15](2-) (3(2-)), and [Fe6C(CO)18](2-) (4(2-)) were isolated as their sodium salt to provide the necessary solubility in water. At pH 5 and -1.25 V vs SCE the clusters afford hydrogen with Faradaic efficiencies ranging from 53-98%. pH dependent cyclic voltammetry measurements provide insight into catalytic intermediates. Both of the butterfly shaped clusters, 1(-) and 2(2-), stabilize protonated adducts and are effective catalysts. Initial reduction of butterfly shaped 1(-) is pH-independent and subsequently, successive protonation events afford H1(-), and then hydrogen. In contrast, butterfly shaped 2(2-) undergoes two successive proton coupled electron transfer events to form H22(2-) which then liberates hydrogen. The higher nuclearity clusters, 3(2-) and 4(2-), do not display the same ability to associate with protons, and accordingly, they produce hydrogen less efficiently.
Research Interests:
Research Interests:
Research Interests:
NA
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
... eksper. teor. Fiz. 57, 247 (1969). [ZO] NGUYEN BA AN, NGUYEN VAN HIEU, NGUYEN TOANTHANG, and NGUYEN AI VIET, pu'uovo [21] CH HENRY, 5. J. HOPFIELD, and L. C. LUTHER, Phys. Rev. Letters 17, 1178 (1966).... more
... eksper. teor. Fiz. 57, 247 (1969). [ZO] NGUYEN BA AN, NGUYEN VAN HIEU, NGUYEN TOANTHANG, and NGUYEN AI VIET, pu'uovo [21] CH HENRY, 5. J. HOPFIELD, and L. C. LUTHER, Phys. Rev. Letters 17, 1178 (1966). [22] G. B. WRIGHT and A. MOORADIAN, Phys. Rev. ...
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
We reviewed our experience with positron imaging tomography (PET) scanning from 1996–1998 in 45 patients (51 scans) with high risk (n = 15) or recurrent melanoma (n = 30). Positive or negative PET findings were considered correct if... more
We reviewed our experience with positron imaging tomography (PET) scanning from 1996–1998 in 45 patients (51 scans) with high risk (n = 15) or recurrent melanoma (n = 30). Positive or negative PET findings were considered correct if confirmed or refuted by other radiologic modalities or biopsy within 6 weeks, or clinical follow up within 6 months. PET scans were usually obtained to make a decision regarding surgical management (29/51 scans, 57%) or to confirm that a patient was disease free (12/51 scans, 23%). PET results facilitated clinical decision making in 15/45 (33%) patients, often due to the detection of distant disease making a surgical procedure inappropriate (5/15, 33%). There were 3 false positive (6%) and 7 false negative (14%) PET scans. False negative scans occurred in patients with small volume disease of the lung (4 patients) or CNS (2 patients, 3 scans). Three patients had false positive scans. These were secondary to benign hepatic tumors and sarcoidosis (one patient each). One patient with stage IV melanoma had PET findings not confirmed by CT scanning or clinical follow-up. PET scanning was clinically useful in a third of patients in our initial experience, and false positives were uncommon. Small volume disease in the lung or CNS may be missed by PET, and additional imaging modalities should be obtained when patient management would be impacted.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
A theoretical explanation is presented for the enhancement of the resonant impurity electronic Raman Scattering in CdTe with the transition of the electron from the donor ground state to the first excited one. If two exciton energy levels... more
A theoretical explanation is presented for the enhancement of the resonant impurity electronic Raman Scattering in CdTe with the transition of the electron from the donor ground state to the first excited one. If two exciton energy levels 1s and 2s are taken into account simultaneously, then the results of the calculations in the polariton theory are in good agreement with the experimental data.
Research Interests:
Research Interests:
Schemes for generation and protocols for network teleportation of multimode entangled cat-states are proposed. Explicit expressions for probability of successful teleportation are derived for both symmetric and asymmetric networks.
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
Exact time-evolution is analytically derived from a coherent photon-exciton system subjected to a monochromatic radiation field resonant with the exciton-biexciton transition. It is shown that biexcitons, which appear under the resonant... more
Exact time-evolution is analytically derived from a coherent photon-exciton system subjected to a monochromatic radiation field resonant with the exciton-biexciton transition. It is shown that biexcitons, which appear under the resonant pumping, might periodically behave as squeezed quasiparticles, if photons or/and excitons are initially in squeezed states. The squeezing degree of the initial photons or/and excitons, the pumping intensity and the off-resonance detuning are demonstrated to govern the transfer of squeezing from the photon-exciton system to the biexciton.
Research Interests:
This thesis attempts to fill in the general gap in scholarly research into the diffusion and social impact of online news both inside and outside Australia. Using historical and survey data, it explores the past and present of online news... more
This thesis attempts to fill in the general gap in scholarly research into the diffusion and social impact of online news both inside and outside Australia. Using historical and survey data, it explores the past and present of online news development to predict its future in both terms of online news production (a producer-centric perspective) and online news uses (a user-centric perspective). In particular, the thesis aims to investigate social and technological factors that influence the adoption and use of online news and online news technologies in the newsroom and among the general public, with a stronger focus on the latter. Beginning with the industrial context of the 1990s, when the world-wide web generated hyperbole about the Internet as a powerful news medium, the thesis goes back to the pre-web history of online news businesses, exploring the interaction between technologies and society to argue that seeing the technical potential online news as the primary driver of its ...
With a fast expansion in both size and substance in the past 20 years, the Vietnamese media system is beginning to feel the need for formal journalism education and training. However, the country's four major journalism programs have... more
With a fast expansion in both size and substance in the past 20 years, the Vietnamese media system is beginning to feel the need for formal journalism education and training. However, the country's four major journalism programs have been fiercely criticised for lagging far behind the big demand, producing hundreds of unqualified journalism graduates a year. Based on data from archival research and indepth interviews with Vietnamese journalists and journalism educators as well as an analysis of curricula, this paper sets out to review this situation and provide a critical analysis of the why and how of this irrelevance, its implications for journalism standards in the country, and potential measures and strategies to improve the situation. First, it will provide a brief overview of journalism education and training in Vietnam, particularly its history and current structure of provision. Second, it reviews the appealing nature of a journalism career among young Vietnamese and the...
Journalists and/or their editors appear to avoid science topics and journalists have the reputation of being largely unequipped to handle medical science, environmental science, or any science, in ways that do not distort, misrepresent or... more
Journalists and/or their editors appear to avoid science topics and journalists have the reputation of being largely unequipped to handle medical science, environmental science, or any science, in ways that do not distort, misrepresent or misunderstand the science and that do not promote a continuing feud with scientists. Nurse & Tooze (2000) contend that the result of this has been a generally low quality of debate about science issues and increased public anxiety. Low levels of understanding are the outcome of the public, the media, politicians and other opinion-formers having little idea of how science is done and how scientific knowledge is advanced, they argue. Although a convenient solution to this problem is seen in the training of specialist science journalists, such an apparent solution is impractical and, indeed, probably unsuitable. A better solution would seem to be to prepare all journalism trainees for the inevitable encounters with science and technology and especiall...
Key findings from the first national survey of the current state of play of online news consumption in Australia indicate that (1) the Internet as a news medium has reached a mainstream status in terms of audience sizes, although its... more
Key findings from the first national survey of the current state of play of online news consumption in Australia indicate that (1) the Internet as a news medium has reached a mainstream status in terms of audience sizes, although its penetration is still within a higher socio-economic segment of the society; (2) many distinctive features of online news have been substantially used and appreciated; and (3) from the perspective of innovation diffusion theory, online news has a notable potential to foster further adoption in the years ahead.