Autor: Le, T.T. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: An improved effective index method for planar multimode waveguide design on an silicon-on-insulator (SOI) platform
Autorzy:: Le, T T
Tematy:: multimode interference (MMI)
silicon-on-insulator (SOI)
effective index method (EIM); Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174442.pdf Link otwiera się w nowym oknie
Opis:: In this paper, an improved effective index method (EIM) for designing planar multimode waveguides on the silicon-on-insulator (SOI) platform is presented. The proposed method predicts the evolution of the fields more accurately than the conventional effective index method. This improved method is particularly suited to the design of multimode interference (MMI) couplers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Design of 4××4 4 Multimode Interference Coupler Based Microring Resonators on an SOI Platform
Autorzy:: Le, T.T.
Cahill, L. W.
Tematy:: integrated optics
multimode interference couplers
optical logic gates; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308902.pdf Link otwiera się w nowym oknie
Opis:: This paper would like to propose a novel microring resonator based on 4 ×4 multimode interference (MMI) couplers. The device acts as two separate microring resonators just in one structure. The transfer matrix method and the three dimensional beam propagation method (3D-BPM) are used to verify the working principle of the device. The device is then designed on silicon on insulator (SOI) technology. This device may be a very promising building block for optical switches, filters, add-drop multiplexers, delay lines and modulators.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Physiological and biochemical changes during the growth of custard apple (Annonasquamosa L.) fruit cultivated in Vietnam
Autorzy:: Le, T.T.
Le, T.V.
Doan, H.T.K.
Nguyen, K.N.
Wydawca:: Instytut Ogrodnictwa
Powiązania:: https://bibliotekanauki.pl/articles/55789052.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Isolation and characterization of a DREB homolog gene from a local drought-tolerant maize cultivar
Autorzy:: Huynh, T.T.H.
Nguyen, T.L.
Luu, H.L.
Nguyen, H.H.
Le, H.D.
Bui, M.M.
Pham, T.H.
Doan, T.B.T.
Le, T.T.H.
Ha, H.H.
Nong, V.H.
Tematy:: drought tolerance
maize
transformation
DrEB gene
Tevang-1 cultivar; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/2117848.pdf Link otwiera się w nowym oknie
Opis:: Clarifying the genetic background of the drought-tolerance trait is a crucial task that may help to improve plant performance under stress by a genetic engineering approach. dehydration-responsive element-binding protein (dREB) is a transcription factor family which modulates many stress-responsive genes. In this study, we isolated a DrEB homolog gene named ZmDrEBtv from Zea mays var. Tevang-1. Using bioinformatic tools, a number of Indels and SNPs in ZmDrEBtv sequence different from the reference accession were identified. In addition, based on deduced protein sequence similarity, ZmdREBtv was assigned to transcription factor dREB2 class as featured by a conserved dNa binding domain – aP2. The ZmDrEBtv construct under thecontrol of the rd29a promoter was transformed into a drought-sensitive maize plant, K7 line. The transgenic plants were assessed with reference to molecular and phenotypic characteristics related to the drought-tolenrance trait. The results proved that the maize plants carrying ZmDrEBtv gene showed enhanced tolerance and better performance to the water-deficit environment at different stages, compared to the wild-type plants.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Content-based image retrieval using a signature graph and a self-organizing map
Autorzy:: Van, T. T.
Le, T. M.
Tematy:: binary signature
similarity measure
signature graph
image retrieval
sygnatura binarna
miara podobieństwa
wyszukiwanie obrazu; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/330159.pdf Link otwiera się w nowym oknie
Opis:: In order to effectively retrieve a large database of images, a method of creating an image retrieval system CBIR (content-based image retrieval) is applied based on a binary index which aims to describe features of an image object of interest. This index is called the binary signature and builds input data for the problem of matching similar images. To extract the object of interest, we propose an image segmentation method on the basis of low-level visual features including the color and texture of the image. These features are extracted at each block of the image by the discrete wavelet frame transform and the appropriate color space. On the basis of a segmented image, we create a binary signature to describe the location, color and shape of the objects of interest. In order to match similar images, we provide a similarity measure between the images based on binary signatures. Then, we present a CBIR model which combines a signature graph and a self-organizing map to cluster and store similar images. To illustrate the proposed method, experiments on image databases are reported, including COREL, Wang and MSRDI.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A Novel Technique of Optimization for the COCOMO II Model Parameters using Teaching-Learning-Based Optimization Algorithm
Autorzy:: Khuat, T. T.
Le, M. H.
Tematy:: COCOMO II
cost estimation
NASA software
optimization
teaching-learning-based optimization algorithm; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/309064.pdf Link otwiera się w nowym oknie
Opis:: Software cost estimation is a critical activity in the development life cycle for controlling risks and planning project schedules. Accurate estimation of the cost before the start-up of a project is essential for both the developers and the customers. Therefore, many models were proposed to address this issue, in which COCOMO II has been being widely employed in actual software projects. Good estimation models, such as COCOMO II, can avoid insufficient resources being allocated to a project. However, parameters for estimation formula in this model have not been optimized yet, and so the estimated results are not close to the actual results. In this paper, a novel technique to optimize the coefficients for COCOMO II model by using teaching-learning-based optimization (TLBO) algorithm is proposed. The performance of the model after optimizing parameters was tested on NASA software project dataset. The obtained results indicated that the improvement of parameters provided a better estimation capabilities compared to the original COCOMO II model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Forecasting Stock Price using Wavelet Neural Network Optimized by Directed Artificial Bee Colony Algorithm
Autorzy:: Khuat, T. T.
Le, Q. C.
Nguyen, B. L.
Le, M. H.
Tematy:: Artificial Bee Colony algorithm
Artificial Neural Network
back-propagation algorithm
stock price forecasting
wavelet transform; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308651.pdf Link otwiera się w nowym oknie
Opis:: Stock prediction with data mining techniques is one of the most important issues in finance. This field has attracted great scientific interest and has become a crucial research area to provide a more precise prediction process. This study proposes an integrated approach where Haar wavelet transform and Artificial Neural Network optimized by Directed Artificial Bee Colony algorithm are combined for the stock price prediction. The proposed approach was tested on the historical price data collected from Yahoo Finance with different companies. Furthermore, the prediction result was found satisfactorily enough as a guide for traders and investors in making qualitative decisions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
Autorzy:: Van, H.T.
Nguyen, T.T.
Ton, H.T.T.
Dinh, K.T.T.
Le, V.S.
Pham, T.V.
Tran, G.B.
Tematy:: Rothmannia wittii
extract
phytochemical composition
antibacterial activity
LC-MS; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2096309.pdf Link otwiera się w nowym oknie
Opis:: Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Investigation of shear stress distribution in a 90 degree channel bend
Autorzy:: Lee, S. K.
Dang, T. A.
Le, V. T.
Tematy:: zginanie
naprężenie ścinające
erozja
experimental channel
90 degree bend
shear stress
erosion
deposition; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/265109.pdf Link otwiera się w nowym oknie
Opis:: Shear stress is a key parameter that plays an important role in sediment transport mechanisms; therefore, understanding shear stress distribution in rivers, and especially in river bends, is necessary to predict erosion, deposition mechanisms and lateral channel migration. The aim of this study is to analyze the shear stress distribution near a river bed at 90-degree channel bend using a depth-average method based on experimental measurement data. Bed shear stress distribution is calculated using the depth-averaged method based on velocity components data has been collected from a 3D-ADV device (three-dimensional acoustic doppler velocity) at different locations of a meandering channel. Laboratory experiments have been made at the hydraulic laboratory of the RCRFIDF (Research Center for River Flow Impingement and Debris Flow), Gangneung-Wonju National University, South Korea to provide data for simulating the incipient motion of the riverbed materials and then predicting the river morphological changes in the curved rivers. The calculated results show that the maximum value of shear stress distribution near the riverbed in the different cross sections of the surveyed channel occurs in a 70-degree cross section and occurs near the outer bank. From the beginning of a 40-degree curved channel section, the maximum value of the shear stress occurs near the outer bank at the end of the channel.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Product diversification from pomelo peel. Essential oil, Pectin and semi-dried pomelo peel
Autorzy:: Le, T. N. Huyen
On, T. N. H
Tran, T. Y. Nhi
Dao, T. Phat
Mai, H. Cang
Tematy:: Citrus grandis
Pomelo peel essential oil
Extract pectin
Pomelo peels products; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/2081509.pdf Link otwiera się w nowym oknie
Opis:: Currently, agriculture has shifted to green production, in which the recycling of post-production by-products is a key issue. In the present work, by-products such as pomelos were studied to promote consumption and enhance the value of pomelo. From pomelo material, essential oils extracted from pomelo peels, pectin, and drying pomelo products have been diversifi ed. In the extraction process of essential oils, the hydrodistillation method was applied in conjunction with the response surface method to obtain the optimal conditions of infl uence factors. These essential oils were quantifi ed as well as determined for components by GC-MS. The pectin recognition process was done by immersion method in HCl acid (pH 2) and the drying process was made with a heat pump dryer under the effects of drying temperature, drying time and wind rate. The results of the essential oil products reached the highest (0.88 ±0.006 g) at the material size of 3 mm, the distillation time of 27 min, and the ratio of raw materials/solvents of 1/12 g/mL. The main components found in pomelo peeling essential oils included limonene (71.768%), γ-terponene (12,847%), α-Phellandrene (2.979%), β-myrcene (2.668%), 1R-α-pinene (2,656%), and β-pinene (1,191%). The pectin content was the highest under the temperature of 90 oC, extraction time of 60 min and ratio/solvent ratio of 1:32 g/mL. Under these extraction conditions, 48% of concentrated pectin content was obtained. Surveying conditions for drying white pomelo peels are capable of reversing: refunded drying pomelos are drying heat pumps in the following conditions: 50 oC drying temperature, the drying time of 90 min, and wind rate of 12 m/s. Product with hardness 309.862 N.
Dostawca treści:: Biblioteka Nauki

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