2010 11th International Conference on Control Automation Robotics & Vision, 2010
Gabor Wavelets are widely used to extract facial features since they are robust against illuminat... more Gabor Wavelets are widely used to extract facial features since they are robust against illumination and pose changes. Due to the limitation in computational power, the common practice is to down-sample the face image to reduce number of Gabor features generated. As not all of the generated Gabor features are necessary, the main objective of this paper is to develop
This thesis complements extant studies of single motherhood and its related living condition in t... more This thesis complements extant studies of single motherhood and its related living condition in the Vietnamese context that only exist in qualitative research methods. It also provides a complement analysis to the existing study by providing evidence from a developing country to a literature that is dominated by evidence from developed countries. The research is based on the individual-level sample of the Population and Housing Census from the years 1999 and 2009, provided by IPUMS International Project. Generally, the results on average indicate that single-mother household is more likely to face more difficulty in living conditions regarding home ownership and having durable goods, than two-parent family. It is clear that two-parent families are at least twofold more likely to have both home ownership and durable goods than single mother families. Moreover, single mothers who are a household head, who lives with only children face more difficulty in living condition indicated by d...
... Ngoc T. Dang and Anh T. Pham Graduate Department of Computer and Information Systems The ... ... more ... Ngoc T. Dang and Anh T. Pham Graduate Department of Computer and Information Systems The ... of distortion and broadening of data signal increase with transmission length (L). This is due to ... In order to calculate MAI currents, we first consider the average number of interfering ...
The aim of this study was to evaluate the influence of vitamin and β-glucan supplementations on g... more The aim of this study was to evaluate the influence of vitamin and β-glucan supplementations on growth performance of growing-finishing pigs in Ben Tre province. A total of 36 post-weaned piglets (Duroc x Yorkshire-Landrace) with the initial live weight of 17.42 kg±0.26, was allotted into 3 treatments and 4 replications in a completely randomized design. There were three diets, including basal diet (BD) without any addition of β-glucan or vitamin (diet CT), the BD supplemented with vitamin (diet Vit) and the BD supplemented with β-glucan (diet Glu). The results on growth parameters indicated that final live weight (kg), weight gain (kg), and average daily gain (g/head/day) of pigs in the experimental diets were significantly higher (P<0.01) than those in the control treatment. FCR was lowest in Glu and highest in the control (P<0.01). Financial benefit based on feed and veterinary expenses was higher in the vitamin and β-glucan supplement diets than that of the control from 15...
Hue University Journal of Science: Natural Science, 2018
Tóm tắt. Chế phẩm nano bạc-TBS (tinh bột sắn) được sử dụng để nghiên cứu khả năng kháng nấm Macro... more Tóm tắt. Chế phẩm nano bạc-TBS (tinh bột sắn) được sử dụng để nghiên cứu khả năng kháng nấm Macrophoma theicola gây bệnh trên quả quýt sau thu hoạch. Kết quả nghiên cứu chứng minh rằng chế phẩm nano bạc-TBS trong điều kiện in vitro nồng độ bổ sung từ 10 ppm đã có tác dụng ức chế sự sinh trưởng và phát triển của nấm sau 2 ngày theo dõi với đường kính tản nấm chỉ đạt 1,4 (±0,4) cm và ức chế hoàn toàn từ nồng độ 30 ppm. Ở điều kiện in vivo, nồng độ chế phẩm nano bạc-TBS có khả năng hạn chế sự phát triển gây bệnh của nấm Macrophoma theicola từ 24,4% đến 100% tương ứng từ 10 đến 90 ppm.
.................................................................................................... more ........................................................................................................................................ viii
Cette thèse traite des problèmes de trading optimal avec une approche de contrôle stochastique et... more Cette thèse traite des problèmes de trading optimal avec une approche de contrôle stochastique et se compose de quatre parties. On commence, dans la première partie, par uneétude de l'impact du volume sur le prix. Pour cela, on introduit un modèle structurel en temps discret dont le changement de prix est dû aux impacts de tous les volumes, affaiblis par un facteur de decay. En utilisant une version continue du modèle précédent, on obtient une condition nécessaire sur les stratégies minimisant une fonctionnelle de type moyenne-variance. Cetteéquation intégrale de Fredholm du premier type est résolue numériquement et on obtient des stratégies optimales. Ces travaux généralisent le modèle d'Almgren-Chriss très utilisé en pratique. Dans la seconde partie, on propose un modèle générique permettant d'optimiser l'utilisation d'algorithmes de trading. En nous basant sur des techniques de contrôle impulsionnel, on modélise l'exécution d'un large ordre par une séquence de variables (τ i , δ i , E i) i de contrôle, définies de telle sort que la i-ième slice est exécutée dans [τ i , τ i + δ i ] avec le paramètre E i envoyé aux robots de trading. On caractérise la fonction valeur comme solution de viscosité d'un système d'EDP. On fournit un schéma numérique et on prouve dont la convergence. L'approche est illustrée par un exemple numérique correspondantà un cas réel, calibré sur données financières. On s'intéresse ensuiteà la notion d'évaluation d'option sur liquidation de book dans un modèleà facteur d'impact, pour lequel les notions habituelles d'évaluation par mesure risque neutre ne font plus sens. On commence par traiter un cadre abstrait qui généralise les travaux de Bouchard-Elie-Touzi (2008), puis on l'appliqueà l'évaluation de garanties de type VWAP. Onétablit dans la dernière partie un résultat d'équivalence entre problèmes de cibles stochastiques et problèmes de contrôle optimal sous forme standard. On montre comment retrouver l'équation d'Hamilton-Jacobi-Bellmaǹ a partir deséquations obtenues par l'approche de cibles stochastiques. Cette partie est déconnectée des autres mais est intéressante car elle apporte un nouveléclairage sur le contrôle optimal.
2015 IEEE International Conference on Communications (ICC), 2015
ABSTRACT In this paper, we newly propose and theoreti-cally analyze the performance of all-optica... more ABSTRACT In this paper, we newly propose and theoreti-cally analyze the performance of all-optical amplify-and-forward (OAF) relaying free-space optical (FSO) systems using erbium-doped fiber amplifier (EDFA) combined with optical hard-limiter (OHL) over atmospheric turbulence channels. The use of OHL enables OAF relaying FSO systems to remove accumulated background noise, which is one of the main factors that limit the system performance. The performance of proposed systems is analytically studied by which closed-form expression for bit-error rate (BER) is formulated, taking into account the effects of at-mospheric turbulence channels and noises caused by background radiation and receiver. The numerical results, which are validated by Monte-Carlo (M-C) simulations, confirm the superiority of the proposed systems in comparison with conventional ones.
Purpose: To study the effect of changing structure of benzyl esters on its reactivity in sodium d... more Purpose: To study the effect of changing structure of benzyl esters on its reactivity in sodium dodecyl sulfate micelles. Methods: Ester molecules with benzyl moiety were either purchased or synthesized. Alkyl groups of the esters were increased incrementally from one to six carbons, also, the location of the ester bond was shifted from the first carbon attached to the benzene ring as in benzyl acetate to three and six carbons awary from the benzene ring as in 3-Phenylpropylacetate and 6-Phenylhexylacetate. Hydrolysis reaction rate constants fro each compound were determined in borate buffer at pH 9 and in surfactant solutions at 40 degrees C. HPLC was used to separate reactants and products. Results: As the number of carbon atoms in the alkyl chain has increased, rate constant in buffer decreased according to an increase in the alkyl chain starting from methyl and ending with hexyl. In micelles, rate constants also decreased as the surfactant concentration increased, this effect ca...
Micelles are aggregates of surfactant molecules used to increase the solubility and bioavailabili... more Micelles are aggregates of surfactant molecules used to increase the solubility and bioavailability of poorly soluble pharmaceutical compounds. Past studies have suggested that a micelle is an oil droplet surrounded by a layer of water. To further investigate the microenvironment of a micelle, the thickness of water penetration was not clearly understood. To study the mechanism of micellar solubilization, we have purchased and synthesized several benzyl esters derivatives. Alkyl chain length of the acid segment was increased from one as in benzyl acetate to ten carbons as in benzyl decanoate. Partition coefficients of each benzyl ester were determined from kinetic data using pseudo phase mathematical model. Degradation studies were conducted using borate buffer at pH 9 and constant temperature (40ºC). Surfactants (SDS) were dissolved in the buffer solution at varying concentrations to extend the concentration range below and above the critical micelle concentration. Reaction product...
In this paper, a novel relaying technique is proposed to improve the bit-error rate (BER) perform... more In this paper, a novel relaying technique is proposed to improve the bit-error rate (BER) performance and distance coverage of high-speed all-optical free-space optical (FSO) communication systems. Particularly, an optical amplifyand-forward (OAF) relaying technique using erbium-doped fiber amplifier (EDFA) combined with optical hard-limiter (OHL) is introduced. The use of OHL enables EDFA-based OAF relaying FSO systems to prevent the accumulation of amplified background noise, which significantly degrades the system performance when deploying multiple relays. For performance evaluation, we theoretically analyze the proposed system over atmospheric turbulence channels modeled by Gamma-Gamma distribution. A closed-form expression for the end-to-end BER bounds is therefore analytically formulated, taking into account other impacts of atmospheric channels including atmospheric attenuation and geometric spreading of the optical beam, as well as noises caused by background light and receiver. The numerical results, which are validated by Monte-Carlo (M-C) simulations, confirm the superiority of the proposed system in comparison with conventional ones. Index Terms-Optical amplify-and-forward relaying, optical hard-limiter, EDFA, background noise, atmospheric turbulence, channel loss, FSO communication systems. I. INTRODUCTION Free-space optical (FSO) communication refers to the lineof-sight (LOS) transmission of modulated optical beams through the atmosphere. FSO has many favorable characteristics such as huge modulation bandwidth, narrow beam size, license-free, and ease of installation [1], [2]. FSO technologies, so far, have attracted much attention for the last-mile applications thanks to the high capacity with low cost and good security that they can offer [2]. Today's commercial FSO systems are able to provide very high bit-rates up to 2.5 or 10 Gigabits per second (Gbps), e.
International Conference on Communications and Electronics 2010, 2010
We propose 2-dimensional (2-D) free-space optical (FSO) CDMA system for broadband access networks... more We propose 2-dimensional (2-D) free-space optical (FSO) CDMA system for broadband access networks. The performance of the proposed system is analyzed over strong atmospheric turbulence channels. To mitigate the impact of the strong atmospheric turbulence, channel coding schemes, including Reed-Solomon (R-S) and convolutional (CC) codes, are employed. In the analysis, we derive the upper bound of bit-error rate (BER) taking
2014 International Conference on Advanced Technologies for Communications (ATC 2014), 2014
In this paper, we propose to use spatial pulse position modulation (SPPM), which is the combinati... more In this paper, we propose to use spatial pulse position modulation (SPPM), which is the combination of optical spatial modulation (SM) and pulse position modulation (PPM), as a powerful technique to improve the performance of free-space optical communication (FSO) systems. We analyze the performance of proposed system taking into account most major effects of FSO channel including geometric spreading (i.e., beam broadening), path loss, and scintillation due to atmospheric turbulence. In addition, background noise and thermal noise are also included in our analysis. The numerical results show the significant improvement in bit error rate (BER) of FSO systems thanks to the use of SPPM. We also found that the location of photodetectors (PDs) and the beam waist at the receiver play important roles in the design of FSO systems using SM and SPPM. Due to the impact of beam broadening, the PDs should be located far from each other otherwise the narrow beam (or small beam waist) should be used.
2010 11th International Conference on Control Automation Robotics & Vision, 2010
Gabor Wavelets are widely used to extract facial features since they are robust against illuminat... more Gabor Wavelets are widely used to extract facial features since they are robust against illumination and pose changes. Due to the limitation in computational power, the common practice is to down-sample the face image to reduce number of Gabor features generated. As not all of the generated Gabor features are necessary, the main objective of this paper is to develop
This thesis complements extant studies of single motherhood and its related living condition in t... more This thesis complements extant studies of single motherhood and its related living condition in the Vietnamese context that only exist in qualitative research methods. It also provides a complement analysis to the existing study by providing evidence from a developing country to a literature that is dominated by evidence from developed countries. The research is based on the individual-level sample of the Population and Housing Census from the years 1999 and 2009, provided by IPUMS International Project. Generally, the results on average indicate that single-mother household is more likely to face more difficulty in living conditions regarding home ownership and having durable goods, than two-parent family. It is clear that two-parent families are at least twofold more likely to have both home ownership and durable goods than single mother families. Moreover, single mothers who are a household head, who lives with only children face more difficulty in living condition indicated by d...
... Ngoc T. Dang and Anh T. Pham Graduate Department of Computer and Information Systems The ... ... more ... Ngoc T. Dang and Anh T. Pham Graduate Department of Computer and Information Systems The ... of distortion and broadening of data signal increase with transmission length (L). This is due to ... In order to calculate MAI currents, we first consider the average number of interfering ...
The aim of this study was to evaluate the influence of vitamin and β-glucan supplementations on g... more The aim of this study was to evaluate the influence of vitamin and β-glucan supplementations on growth performance of growing-finishing pigs in Ben Tre province. A total of 36 post-weaned piglets (Duroc x Yorkshire-Landrace) with the initial live weight of 17.42 kg±0.26, was allotted into 3 treatments and 4 replications in a completely randomized design. There were three diets, including basal diet (BD) without any addition of β-glucan or vitamin (diet CT), the BD supplemented with vitamin (diet Vit) and the BD supplemented with β-glucan (diet Glu). The results on growth parameters indicated that final live weight (kg), weight gain (kg), and average daily gain (g/head/day) of pigs in the experimental diets were significantly higher (P<0.01) than those in the control treatment. FCR was lowest in Glu and highest in the control (P<0.01). Financial benefit based on feed and veterinary expenses was higher in the vitamin and β-glucan supplement diets than that of the control from 15...
Hue University Journal of Science: Natural Science, 2018
Tóm tắt. Chế phẩm nano bạc-TBS (tinh bột sắn) được sử dụng để nghiên cứu khả năng kháng nấm Macro... more Tóm tắt. Chế phẩm nano bạc-TBS (tinh bột sắn) được sử dụng để nghiên cứu khả năng kháng nấm Macrophoma theicola gây bệnh trên quả quýt sau thu hoạch. Kết quả nghiên cứu chứng minh rằng chế phẩm nano bạc-TBS trong điều kiện in vitro nồng độ bổ sung từ 10 ppm đã có tác dụng ức chế sự sinh trưởng và phát triển của nấm sau 2 ngày theo dõi với đường kính tản nấm chỉ đạt 1,4 (±0,4) cm và ức chế hoàn toàn từ nồng độ 30 ppm. Ở điều kiện in vivo, nồng độ chế phẩm nano bạc-TBS có khả năng hạn chế sự phát triển gây bệnh của nấm Macrophoma theicola từ 24,4% đến 100% tương ứng từ 10 đến 90 ppm.
.................................................................................................... more ........................................................................................................................................ viii
Cette thèse traite des problèmes de trading optimal avec une approche de contrôle stochastique et... more Cette thèse traite des problèmes de trading optimal avec une approche de contrôle stochastique et se compose de quatre parties. On commence, dans la première partie, par uneétude de l'impact du volume sur le prix. Pour cela, on introduit un modèle structurel en temps discret dont le changement de prix est dû aux impacts de tous les volumes, affaiblis par un facteur de decay. En utilisant une version continue du modèle précédent, on obtient une condition nécessaire sur les stratégies minimisant une fonctionnelle de type moyenne-variance. Cetteéquation intégrale de Fredholm du premier type est résolue numériquement et on obtient des stratégies optimales. Ces travaux généralisent le modèle d'Almgren-Chriss très utilisé en pratique. Dans la seconde partie, on propose un modèle générique permettant d'optimiser l'utilisation d'algorithmes de trading. En nous basant sur des techniques de contrôle impulsionnel, on modélise l'exécution d'un large ordre par une séquence de variables (τ i , δ i , E i) i de contrôle, définies de telle sort que la i-ième slice est exécutée dans [τ i , τ i + δ i ] avec le paramètre E i envoyé aux robots de trading. On caractérise la fonction valeur comme solution de viscosité d'un système d'EDP. On fournit un schéma numérique et on prouve dont la convergence. L'approche est illustrée par un exemple numérique correspondantà un cas réel, calibré sur données financières. On s'intéresse ensuiteà la notion d'évaluation d'option sur liquidation de book dans un modèleà facteur d'impact, pour lequel les notions habituelles d'évaluation par mesure risque neutre ne font plus sens. On commence par traiter un cadre abstrait qui généralise les travaux de Bouchard-Elie-Touzi (2008), puis on l'appliqueà l'évaluation de garanties de type VWAP. Onétablit dans la dernière partie un résultat d'équivalence entre problèmes de cibles stochastiques et problèmes de contrôle optimal sous forme standard. On montre comment retrouver l'équation d'Hamilton-Jacobi-Bellmaǹ a partir deséquations obtenues par l'approche de cibles stochastiques. Cette partie est déconnectée des autres mais est intéressante car elle apporte un nouveléclairage sur le contrôle optimal.
2015 IEEE International Conference on Communications (ICC), 2015
ABSTRACT In this paper, we newly propose and theoreti-cally analyze the performance of all-optica... more ABSTRACT In this paper, we newly propose and theoreti-cally analyze the performance of all-optical amplify-and-forward (OAF) relaying free-space optical (FSO) systems using erbium-doped fiber amplifier (EDFA) combined with optical hard-limiter (OHL) over atmospheric turbulence channels. The use of OHL enables OAF relaying FSO systems to remove accumulated background noise, which is one of the main factors that limit the system performance. The performance of proposed systems is analytically studied by which closed-form expression for bit-error rate (BER) is formulated, taking into account the effects of at-mospheric turbulence channels and noises caused by background radiation and receiver. The numerical results, which are validated by Monte-Carlo (M-C) simulations, confirm the superiority of the proposed systems in comparison with conventional ones.
Purpose: To study the effect of changing structure of benzyl esters on its reactivity in sodium d... more Purpose: To study the effect of changing structure of benzyl esters on its reactivity in sodium dodecyl sulfate micelles. Methods: Ester molecules with benzyl moiety were either purchased or synthesized. Alkyl groups of the esters were increased incrementally from one to six carbons, also, the location of the ester bond was shifted from the first carbon attached to the benzene ring as in benzyl acetate to three and six carbons awary from the benzene ring as in 3-Phenylpropylacetate and 6-Phenylhexylacetate. Hydrolysis reaction rate constants fro each compound were determined in borate buffer at pH 9 and in surfactant solutions at 40 degrees C. HPLC was used to separate reactants and products. Results: As the number of carbon atoms in the alkyl chain has increased, rate constant in buffer decreased according to an increase in the alkyl chain starting from methyl and ending with hexyl. In micelles, rate constants also decreased as the surfactant concentration increased, this effect ca...
Micelles are aggregates of surfactant molecules used to increase the solubility and bioavailabili... more Micelles are aggregates of surfactant molecules used to increase the solubility and bioavailability of poorly soluble pharmaceutical compounds. Past studies have suggested that a micelle is an oil droplet surrounded by a layer of water. To further investigate the microenvironment of a micelle, the thickness of water penetration was not clearly understood. To study the mechanism of micellar solubilization, we have purchased and synthesized several benzyl esters derivatives. Alkyl chain length of the acid segment was increased from one as in benzyl acetate to ten carbons as in benzyl decanoate. Partition coefficients of each benzyl ester were determined from kinetic data using pseudo phase mathematical model. Degradation studies were conducted using borate buffer at pH 9 and constant temperature (40ºC). Surfactants (SDS) were dissolved in the buffer solution at varying concentrations to extend the concentration range below and above the critical micelle concentration. Reaction product...
In this paper, a novel relaying technique is proposed to improve the bit-error rate (BER) perform... more In this paper, a novel relaying technique is proposed to improve the bit-error rate (BER) performance and distance coverage of high-speed all-optical free-space optical (FSO) communication systems. Particularly, an optical amplifyand-forward (OAF) relaying technique using erbium-doped fiber amplifier (EDFA) combined with optical hard-limiter (OHL) is introduced. The use of OHL enables EDFA-based OAF relaying FSO systems to prevent the accumulation of amplified background noise, which significantly degrades the system performance when deploying multiple relays. For performance evaluation, we theoretically analyze the proposed system over atmospheric turbulence channels modeled by Gamma-Gamma distribution. A closed-form expression for the end-to-end BER bounds is therefore analytically formulated, taking into account other impacts of atmospheric channels including atmospheric attenuation and geometric spreading of the optical beam, as well as noises caused by background light and receiver. The numerical results, which are validated by Monte-Carlo (M-C) simulations, confirm the superiority of the proposed system in comparison with conventional ones. Index Terms-Optical amplify-and-forward relaying, optical hard-limiter, EDFA, background noise, atmospheric turbulence, channel loss, FSO communication systems. I. INTRODUCTION Free-space optical (FSO) communication refers to the lineof-sight (LOS) transmission of modulated optical beams through the atmosphere. FSO has many favorable characteristics such as huge modulation bandwidth, narrow beam size, license-free, and ease of installation [1], [2]. FSO technologies, so far, have attracted much attention for the last-mile applications thanks to the high capacity with low cost and good security that they can offer [2]. Today's commercial FSO systems are able to provide very high bit-rates up to 2.5 or 10 Gigabits per second (Gbps), e.
International Conference on Communications and Electronics 2010, 2010
We propose 2-dimensional (2-D) free-space optical (FSO) CDMA system for broadband access networks... more We propose 2-dimensional (2-D) free-space optical (FSO) CDMA system for broadband access networks. The performance of the proposed system is analyzed over strong atmospheric turbulence channels. To mitigate the impact of the strong atmospheric turbulence, channel coding schemes, including Reed-Solomon (R-S) and convolutional (CC) codes, are employed. In the analysis, we derive the upper bound of bit-error rate (BER) taking
2014 International Conference on Advanced Technologies for Communications (ATC 2014), 2014
In this paper, we propose to use spatial pulse position modulation (SPPM), which is the combinati... more In this paper, we propose to use spatial pulse position modulation (SPPM), which is the combination of optical spatial modulation (SM) and pulse position modulation (PPM), as a powerful technique to improve the performance of free-space optical communication (FSO) systems. We analyze the performance of proposed system taking into account most major effects of FSO channel including geometric spreading (i.e., beam broadening), path loss, and scintillation due to atmospheric turbulence. In addition, background noise and thermal noise are also included in our analysis. The numerical results show the significant improvement in bit error rate (BER) of FSO systems thanks to the use of SPPM. We also found that the location of photodetectors (PDs) and the beam waist at the receiver play important roles in the design of FSO systems using SM and SPPM. Due to the impact of beam broadening, the PDs should be located far from each other otherwise the narrow beam (or small beam waist) should be used.
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