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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (9)
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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (9)
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  • 1
    Online Resource
    Online Resource
    AN INTEGRATED AVOIDING AND APPROACHING HUMAN SYSTEMS FOR MOBILE SERVICE ROBOTS IN DYNAMIC SOCIAL ENVIRONMENTS
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Science and Technology Vol. 60, No. 1 ( 2022-02-23)
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 60, No. 1 ( 2022-02-23)
    Abstract: In this study, we present a socially aware navigation framework for mobile service robots by integrating the systems proposed in our previous studies into a completed mobile robot navigation system, including the human detection and tracking system that is used to detect and track humans; the encoder and laser-based localization and mapping system that is used to determine the position of the robot in the environment; the approaching pose estimation system that is used to estimate the approaching pose of the robot to the human; and the social timed elastic band-based motion planning system that is used to socially navigate the mobile robots to approach the human. In addition, in the paper we describe in detail the motor control system and the design of our mobile robot platform, which is then utilized to conduct experiments in the real-world environments. We verify the feasibility and usefulness of the proposed socially aware robot navigation framework through a series of experiments in a corridor-like environment. The experimental results show that our proposed framework is able to drive the mobile robots to both avoid and approach the humans, providing the safety and comfort for the humans and socially acceptable behaviors for the mobile service robots in the dynamic social environments.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/15993
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam: a review on the state of research
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2023
    In:  Vietnam Journal of Earth Sciences ( 2023-04-19)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2023-04-19)
    Abstract: Global warming enhances atmospheric moisture loading and will likely affect monsoon strength in Vietnam. Without a long written history in Vietnam, we need to rely on geoarchives such as lake sediments to reconstruct past monsoon variability and regional paleoenvironmental fluctuations and evaluate current climatic trends. Natural lakes in the Central Highlands of Vietnam have the potential to have recorded shifts of the monsoon belt over glacial/interglacial cycles. Since 2016, the EOS Geoscience Research Group at Vietnam National University, Hanoi (EOS group) has collaborated with international partners to collect and analyze Vietnamese lake sediments to reconstruct the Pleistocene-Holocene climate history. Numerous sediment cores have been retrieved from Biển Hồ, Ia Bang, Ea Tyn, Ea Sno and Lak lakes between 2016 and 2022. Of special importance is a 25 m long sediment core from Biển Hồ Lake (Gia Lai province) covering the last 57 ka, which the team retrieved in April 2021. Sediment cores were analyzed for geochemistry, sedimentology, magnetic susceptibility, and radiocarbon dating. This paper reviews the status of our currently available sedimentary records to assess the paleoenvironmental potential of lacustrine sediments in the Central Highlands of Vietnam. Current data suggest that the lakes in the Central Highlands provide reliable sedimentological and geochemical records and bear the potential to reconstruct the paleoenvironmental and paleoclimatic conditions in Vietnam across several glacial periods, with a high-resolution record at least in the Holocene. The records contribute to quantifying the effects of monsoon variability and assessing the changes in hydrological conditions before and after the onset of human land use by comparing different lakes in the region. Future fieldwork will focus on retrieving longer lake sediment sequences from the Central Highlands, possibly covering the full interglacial-glacial cycle (i.e. the last 125 ka, back to MIS-5e), and on the assessment of comparable lake archives in other parts of Vietnam where the timing and character of monsoon-related climatic variations may have differed.
    Type of Medium: Online Resource
    ISSN: 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/18281
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2023
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Research on marine environment and coral distribution on Nam Yet island using VNRedsat-1 and QuickBird images
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 19, No. 3B ( 2019-10-21), p. 189-202
    Details
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 3B ( 2019-10-21), p. 189-202
    Abstract: Based on the processing of VNRedsat-1 and QuickBird images in the area of Truong Sa archipelago, the research results showed the efficiency of assessing marine environmental characteristics in surroundings of these islands. In this paper, we presented the research results on Nam Yet island and adjacent area. The marine parameters in this research include sea surface temperature (SST) and chlorophyll-a concentration in the surface layer as well as in the deep layers of 20m and 40m, the distributions of the ground objects such as coral shelf, sand accumulation, coral reef combined with seagrass and seaweed. The accuracy of assessment of supervised and unsupervised classified results is approximate of 87.8%. The research results allowed assessing the environmental characteristics, warning of the risk of erosion and coastal line change in the study area.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/19/3B/14525
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Facile Synthesis of Carbon Quantum Dots by Plasma-liquid Interaction Method
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Communications in Physics Vol. 27, No. 4 ( 2018-01-26), p. 311-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 27, No. 4 ( 2018-01-26), p. 311-
    Abstract: Carbon quantum dots (CQDs) are a novel type of fluorescent nano-materials with various unique properties. They are recently attracting enormous interest due to their superiority in water solubility, chemical inertness, low toxicity, ease of functionalization as well as resistance to photo-bleaching and potential applications in biomedical indication, photo-catalysis, energy conversion, optoelectronics, and sensing. In this work, we present a facile and environmentally friendly synthesis of CQDs based on plasma - liquid interaction method. This is a single-step method and does not use toxic chemicals. The size distribution of obtained CQDs is rather uniform at approximately 3 nm. The emission peak of CQDs shifts from 427 nm to 523 nm as the excitation wavelength is varied from 340 nm to 460 nm. The non-equilibrium reactive chemistry of plasma liquid interaction is responsible for acceleration of the CQDs formation process.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-27-4
    DOI: 10.15625/0868-3166/27/4/10867
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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    Online Resource
  • 5
    Online Resource
    Online Resource
    An alternative method for determining the coefficient of thermal expansion of composite material of spherical particles
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2007
    In:  Vietnam Journal of Mechanics Vol. 29, No. 1 ( 2007-03-31), p. 58-64
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 29, No. 1 ( 2007-03-31), p. 58-64
    Abstract: Composite material is widely used in modern structures. Many researchers have been involved in studying, developing and applying this kind of material. The composite material of spherical particles is a material composed of continuous matrix phase and spherical particles. In modern technique, it is very necessary to consider the influence of temperature on toughness and stability of structures. Therefore, determining the coefficient of thermal expansion of composite as a function of the coefficients and volume fractions of matrix and particle phases is a practical requirement. In this paper. we would like to introduce an alternative derivation method in order to obtain the thermal expansion coefficient of two-phase composite of spherical particles. Our results are the same as Vanin's and other authors'.
    Type of Medium: Online Resource
    ISSN: 0866-7136 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/29/1/5591
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2007
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Application of satellite images and VNREDSAT-1 images in study on marine environment in Truong Sa region
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 19, No. 3B ( 2019-10-21), p. 149-162
    Details
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 3B ( 2019-10-21), p. 149-162
    Abstract: The remote sensing images, including images of MODIS, VNREDSAT-1 and altimeter, are applied for researching marine environment with the different resolutions. On the basis of different time remote sensing images, we concentrated on the assessment of several characteristics including the SST, chlorophyll-a concentration and sea surface current at the different depths in different monsoons as well. With the large areas, we used the images of MODIS and altimeter. The detailed research area focuses on the Nam Yet island, and the images of VNREDSAT-1 are used. The analysis method of environmental parameters of SST and chlorophyll-a used the regression functions based on the single and combined bands to enhance the accuracy of the analysis result. The marine parameters collected at different depths in the latest field surveys on Truong Sa archipelago in the years of 2015 and 2018 are presented in this paper. On the basis of these parameters, we can analyse the relationships and compare the real field survey data and corresponding results interpreted from remote sensing images.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/19/3B/14522
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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    Online Resource
  • 7
    Online Resource
    Online Resource
    AGROBACTERIUM-MEDIATED TRANSFORMATION OF PANAX VIETNAMENSIS HA ET GRUSHV.
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 15, No. 4 ( 2018-12-14), p. 641-650
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 15, No. 4 ( 2018-12-14), p. 641-650
    Abstract: In recent years, the Agrobacterium-mediated genetic transformation system has become the most useful method widely used for the introduction of foreign genes into plant cells followed by regeneration of genetically improved plants. Panax vietnamensis Ha et Grushv. is a highly valued medicinal plant native to Vietnam with limited area of distribution. This report illustrates the possibilities of biotechnology for genetic transformation aimed at establishing an effective production of secondary metabolites in P. vietnamensis. In the present investigation, 0.5 cm2 leaf blades, 1 cm long leaf petioles and 0.5 cm3 callus clusters were used for the hairy root induction. Results indicated that hairy roots were induced on P. vietnamensis callus clusters co-cultivated with Agrobacterium rhizogenes strain ATCC15834 at OD600 of 0.5 with an infection time of 20 min and a supplementation of 100 mM acetosyringone. PCR amplification of the DNA isolated from the resulting hairy roots was used to confirm the presence of rol genes. Compared to in vitro rhizome cultures, hairy root cultures appear to be potential for continuous production of valuable secondary metabolites with similar saponin profiles. The protocol described in this study is simple and rapid and therefore, can be used for large-scale experiments for the rapid production of valuable compounds.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/15/4/13404
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Assessment of gene and protein similarities of Beijing-1 vaccine producing strain with Japanese encephalitis virus strains circulating in Vietnam
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Biotechnology Vol. 18, No. 4 ( 2021-05-24), p. 663-670
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 18, No. 4 ( 2021-05-24), p. 663-670
    Abstract: Since 2006, the inactivated Japanese encephalitis vaccine has been studied and produced by the VABIOTECH company from the Beịing-1 strain on Vero cells. Vaccines produced from the materseed and working seed virus have been evaluated at laboratory and clinical scale in humans. The results showed that the vaccine was safe and created 100% protective antibodies after the booster dose. To officially put this vaccine into production and mass use, the master seed virus BV-MSV-0210 and working seed virus BV-WSV-0310 with the reference standard strain JEV Beijing-Kanonji has been tested for genetic stability. By the method of Sanger sequencing and genetic analysis software, we have evaluated the similarity of nucleotide and proteinsequencesof the E antigen-encoding gene. The results showed that the seed virus similarity of amino acids and nucleotides is 100% compared with the reference strain. Thus, it can be concluded, the seed virus has antigen stability. Nucleotide and amino acid gene sequences of E genomic regions of the two seed lots were compared with virus strains isolated from human, pig and mosquito in Vietnam. The results showed that the nucleotide similarity of seed virus compared with the JEV strains isolated from humans ranged from 86.67 to 97.54%; from pigs is 87.47 to 88.33%, and from mosquitoes is 86.05 to 99%. Meanwhile, the amino acid similarity of the seed virus with the JEV strains isolated from humans ranged from 96.73 to 99.02%; from pigs is 98.00 to98.40% and from mosquitoes 94.55 to 98.40%. The sequence of amino acids in the epitope producing neutralizing antibodies of the seed virus did not differ from that of the JEV strain circulating in humans isolated in 2014.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/18/4/15398
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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    Online Resource
  • 9
    Online Resource
    Online Resource
    AN IMPROVED INDEXING METHOD FOR QUERYING BIG XML FILES
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2023
    In:  Journal of Computer Science and Cybernetics ( 2023-12-25), p. 323-342
    Details
    In: Journal of Computer Science and Cybernetics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2023-12-25), p. 323-342
    Abstract: The exponential growth of bioinformatics in the healthcare domain has revolutionized our understanding of DNA, proteins, and other biomolecular entities. This remarkable progress has generated an overwhelming volume of data, necessitating big data technologies for efficient storage and indexing. While big data technologies like Hadoop offer substantial support for big XML file storage, the challenges of indexing data sizes and XPath query performance persist. To enhance the efficiency of XPath queries and address the data size problem, a novel approach that is derived from the spatial indexing method of the R-tre family. The proposed method is to modify the structure of leaf nodes in the indexing tree to preserve XML-sibling connections. Then, new algorithms for constructing the new tree structure and processing sibling queries better are introduced. Experimental results demonstrate the superior efficiency of sibling XPath queries with reduced data sizes for indexing, while other XPath queries exhibit notable performance improvements. This research contributes to the development of more effective indexing methods for managing and querying large XML datasets in bioinformatics applications, ultimately advancing biomedical research and healthcare initiatives.
    Type of Medium: Online Resource
    ISSN: 2815-5939 , 1813-9663
    URL: Article
    DOI: 10.15625/1813-9663/19018
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2023
    detail.hit.zdb_id: 3169641-7
    SSG: 24,1
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