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  • Viet Nam National University Ho Chi Minh City  (38)
  • 1
    Online Resource
    Online Resource
    SIMULATING CHARACTERISTICS OF CARBON NANOTUBE FIELD- EFFECT TRANSISTOR (CNTFET)
    Viet Nam National University Ho Chi Minh City ; 2010
    In:  Science and Technology Development Journal Vol. 13, No. 2 ( 2010-06-30), p. 15-27
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 13, No. 2 ( 2010-06-30), p. 15-27
    Abstract: We provide a model of coaxial CNTFET, using single wall nanotube. These devices would exhibit wrap-around gates that maximize capacitive coupling between the gate electrode and the nanotube channel. The results of simulations of I-V characteristics for CNTFETs are presented. Here we use non-equilibrium Green’s function (NEGF) to perform simulation for CNTFET. This simulator also includes a graphic user interface (GUI) of Matlab that enables parameter entry, calculation control, display of calculation results. In this work, we review the capabilities of the simulator, summarize the theoretical approach and experimental results. Current-voltage characteristics are a function of the variables such as: diameter of CNT, the length of CNT, the gate oxide thickness, gate voltage of Vg, types of materials of Source-Drain, Gate, and temperature. The obtained I-V characteristics of the CNTFET are also presented by analytical equations.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v13i2.2123
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2010
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  • 2
    Online Resource
    Online Resource
    Determination of the concentration of Fe, Se and Zn elements in nails of Vietnamese women with breast cancer using k0-INAA method
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal Vol. 22, No. 4 ( 2020-01-23), p. 370-377
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 22, No. 4 ( 2020-01-23), p. 370-377
    Abstract: Introduction: Breast cancer is the most common type of cancer resulting in death. Trace elements of Fe, Se and Zn can play a key role in the onset and prevention of breast cancer. Trace elements in the fingernails may be used as bioindicators for breast cancer diagnosis. The purpose of this work is to determine the concentrations of Fe, Se, and Zn in the fingernails of women with breast cancer and healthy women, which used to find the difference and correlation of these elements in the fingernail. Methods: This research was approved by the Ethics Committee of Dong Nai General Hospital. The fingernail collected from 29 women with breast cancer and 30 healthy women, who are the same age and living in Dong Nai province, Vietnam. The concentrations of Fe, Se, and Zn in the fingernails were determined using the k0-INAA method. The analytical data were evaluated using some statistical analysis for the correlation of trace elements in the fingernails of both groups. Results: As a result, the mean concentrations of Fe, Se and Zn in fingernails of women with breast cancer were 102.87 ug/g, 0.75 ug/g and 65.49 ug/g, respectively, while those of healthy women were 69.74 ug/g, 0.78 ug/g and 107.75 ug/g. The assessment of these elements in fingernails for both two sample groups, including t-test and correlation coefficients, was also carried out in this study. As a result, the significant difference (p 〈 0.05) was found for the Fe and Zn in fingernails of women with breast cancer, while those of Se was not found. The correlation between Se and Zn was found in both groups. The correlation between Fe and Zn was found in fingernails of healthy women, but it disappears in the women with breast cancer. Conclusions: From our finding, it can be concluded that Fe and Zn significantly associated with the risk of breast cancer, while Se is not associated.  
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v22i4.1698
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 3
    Online Resource
    Online Resource
    Applying approximate entropy to compare the randomness of data series in Aseans’stock markets
    Viet Nam National University Ho Chi Minh City ; 2019
    In:  Science & Technology Development Journal - Economics - Law and Management Vol. 2, No. 4 ( 2019-03-28), p. 5-13
    Details
    In: Science & Technology Development Journal - Economics - Law and Management, Viet Nam National University Ho Chi Minh City, Vol. 2, No. 4 ( 2019-03-28), p. 5-13
    Abstract: The paper calculates the approximate entropy using the algorithm proposed by Pincus (2008) on the daily closing price of ASEAN countries’ stock indices collected from the Datastream from January 2000 to December 2016. The approximate entropy is employed to measure the randomness of financial time series in ASEAN countries’ stock markets. The results on the whole data show that the fluctuation rate of return is much higher than the stock index and Singapore has the most stochastic time series, including stock index and its return. Indonesia’s stock index exhibits the lowest randomness as suggested by approximate entropy. After crisis, the randomness of time series in the Vietnam’s market is sharply enhanced and the Philippines has become a potential country for investors to seek arbitrage opportunities.
    Type of Medium: Online Resource
    ISSN: 2588-1051 , 2588-1051
    URL: Article
    DOI: 10.32508/stdjelm.v2i4.525
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2019
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  • 4
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    Online Resource
    Applying transfer entropy approach to investigate the information flow among ASEAN stock markets
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science & Technology Development Journal - Economics - Law and Management Vol. 4, No. 1 ( 2020-04-04), p. First-
    Details
    In: Science & Technology Development Journal - Economics - Law and Management, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 1 ( 2020-04-04), p. First-
    Abstract: This paper uses transfer entropy to measure and identify the information flows between stock markets in the ASEAN region. Data on daily closing stock indices, including Vietnam, the Philippines, Malaysia, Indonesia, Thailand, and Singapore, are collected for the period from March 2012 to October 2019 to calculate these transfer entropies. The research results of this article can be considered in two aspects: one is, how information flow originating from one market will be accepted by other markets and secondly, information flow that markets receive. From the perspective of incoming transfer entropy, Vietnam is the country most affected by information from the other ASEAN markets while Indonesia and Malaysia are the least affected. In terms of outgoing entropy, Thailand is the largest source of information flow to the ASEAN markets. Malaysia and the Philippines are the two countries that receive minor information impact from other countries. The research also reveals that the Singapore stock market is rather separate from the other ASEAN countries. The research results also imply that, for investors and policymakers, defining the information flows among ASEAN stock markets can help to predict market movements, thereby developing a suitable investment strategy or establishing appropriate management policies.
    Type of Medium: Online Resource
    ISSN: 2588-1051 , 2588-1051
    URL: Article
    DOI: 10.32508/stdjelm.v4i1.604
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    Noncatalytic biodiesel synthesis from rubber seed oil via supercritical methanol and ethanol
    Viet Nam National University Ho Chi Minh City ; 2016
    In:  Science and Technology Development Journal Vol. 19, No. 3 ( 2016-09-30), p. 129-137
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 19, No. 3 ( 2016-09-30), p. 129-137
    Abstract: This paper reports the production of fatty acid methyl esters (FAMEs) and fatty acid ethyl esters (FAEEs) by the transesterification reaction of rubber seed oil (RSO) in supercritical methanol and ethanol without using any catalyst. Experiment were carried out in a batch reactor, and reactions were studied at 260, 280, 300 and 320 oC at a pressure of 8.1-19 MPa with various mole ratios of ethanol – to - methanol from 0 to 100%. The extent of the reaction was explored using a convertibility parameter, which corresponds to the maximum ester content attainable from the feedstock. The highest FAME and FAEE contents achieved were 91.8 % and 86.4%, respectively. Results show that transesterification of RSO in methanol was more efficient than that in ethanol; the temperature had the strongest influence.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v19i3.579
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2016
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  • 6
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    Solid state lithium-ion rechargeable batteries: An overview
    Nguyen, Huu Huy Phuc ; Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City, Vietnam ; Tran, Anh Tu ; [et al.]
    Viet Nam National University Ho Chi Minh City ; 2023
    In:  Science & Technology Development Journal - Engineering and Technology ( 2023)
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, ( 2023)
    Abstract: Rechargeable solid-state Li-ion batteries have potential for applications in mobile devices and electric vehicles in the near future to meet the growing demand for high energy storage. Research on rechargeable solid-state Li-ion batteries has a long history and has been accelerating recently. Solid electrolytes are the most important component in the all-solid-state batteries. Solid electrolytes can be divided into the following groups: oxide groups (Perovskite Li3.3La0.56TiO3, NASICON LiTi2(PO4)3, LISICON Li14Zn(GeO4)4, and Li7La3Zr2O12 garnets), sulfide groups (Li2S – P2S5 and Li2S – P2S5 – MxS), hydride group (LiBH4, LiBH4–LiX (X=Cl, Br or I), LiBH4–LiNH2, LiNH2, Li3AlH6 and Li2NH), halogen group (LiI, spinel Li2ZnI4 and anti-perovskite Li3OCl), and polymer group (mainly polyethylene). Although electrolytes with good ionic conductivity have been used, the performance of solid-state rechargeable Li-ion batteries is still far behind that of the ones using liquid electrolytes. Along with the development of science and technology, many scientific and technical problems in solid-state rechargeable Li-ion batteries have been discovered. In this review, the major issues of solid-state rechargeable Li-ion batteries will be breifly documented: the interface between the active material (AM) and the solid electrolyte (SE), aging of the solid-solid interface, electrode structure, and fabrication methods.
    Type of Medium: Online Resource
    ISSN: 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v6i1.1036
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2023
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  • 7
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    Study of lamellar structures of graft-type fluorinated proton exchange membranes by small-angle X-ray scattering: preparation procedures and grafting degree dependence for fuel application
    Viet Nam National University Ho Chi Minh City ; 2015
    In:  Science and Technology Development Journal Vol. 18, No. 3 ( 2015-08-30), p. 153-161
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 18, No. 3 ( 2015-08-30), p. 153-161
    Abstract: The variation of lamellar structures of poly(styrenesulfonic acid)-grafted poly (ethylene-co-tetrafluoroethylene) proton exchange membranes dependence on preparation procedures and grafting degree (GD) was investigated by small angle X-ray scattering. The detail structures of lamellar including lamellar period L, thickness of lamellar crystal Lc, thickness of lamellar amorphous La, and linear crystallinity Lc/L were examined by a 1D correlation function. The lamellar structures were recognized at the grafting step and did not change under the sulfonation process. With GD  79 %, Lc significantly decreased (corresponding to the increase of La) and then retained in the GDs of 79-117 %. Note that the retained values of Lc, La, and linear crystallinity in the GDs of 79-117 % are the origin of high conductivity and mechanical strength of membranes under severe operation conditions for fuel cell applications.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v18i3.831
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2015
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  • 8
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    Online Resource
    From semigroup action to homomorphic encryption and some related problems in cryptography
    Viet Nam National University Ho Chi Minh City ; 2015
    In:  Science and Technology Development Journal Vol. 18, No. 3 ( 2015-08-30), p. 254-259
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 18, No. 3 ( 2015-08-30), p. 254-259
    Abstract: In some recent papers, the authors have showed some homomorphic cryptosystems which are particular cases of split exact sequences of groups. By connecting the relation between these ideas to the concept of group action, in this paper, we build a public key exchange protocol based on actions to a group, from its automorphism group and semigroup ℤ under usual multiplication.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v18i3.842
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2015
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  • 9
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    Online Resource
    Fabrication of titanium nitride thin films by DC magnetron sputtering on different types of subtrates for coating applications
    Viet Nam National University Ho Chi Minh City ; 2014
    In:  Science and Technology Development Journal Vol. 17, No. 4 ( 2014-12-31), p. 65-73
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 17, No. 4 ( 2014-12-31), p. 65-73
    Abstract: Titanium nitride thin films (TiN) are fabricated by DC magnetron sputtering on different types of substrates such as glass substrates, PET substrates, substrate alloy (AISI 304) and drill steel. In this work we study the effect of distance target - substrate, sputtering time and negative voltage to the crystal structure, mechanical properties and optical films. The properties of thin films were studied by X-ray diffraction method Stylus, UV – Vis method and scanning electron microscopy. Results showed that the distance target - substrate, sputtering time and negative voltage affects the crystalline structure, mechanical properties and optical films. TiN films have been synthesized highly crystalline structure, crystal structure of thin films oriented along the the surface lattice (111), (200) and (311). Besides TiN thin films also have high reflectance in the visible and infrared range, good adhesion, high chemical durability.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v17i4.1557
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2014
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  • 10
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    Online Resource
    Propose a smart classroom model to enhance education experience in industrial revolution 4.0 era
    Viet Nam National University Ho Chi Minh City ; 2022
    In:  Science & Technology Development Journal - Economics - Law and Management ( 2022)
    Details
    In: Science & Technology Development Journal - Economics - Law and Management, Viet Nam National University Ho Chi Minh City, ( 2022)
    Abstract: Industry 4.0 has changed many areas of life, among which education is one of the fields with the most impact. Education 4.0 is increasingly developing in the world, and the concept of smart education is becoming a current trend, especially in the context of the Covid-19 pandemic. The application of new technologies such as Artificial Intelligence (AI) and Internet of Things (IoT) in training is also increasingly of interest globally, and Vietnam is no exception. The rapid growth of Industry 4.0, and Smart Education with Smart City development and the Covid-19 pandemic in Vietnam, have accelerated the burgeoning of Smart Classroom. These advances have given rise to various applications in several areas of society, ranging from digital transformation to managing and automating simple tasks. Foreseeing that trend, in this study, the authors reviewed the most typical research works on smart classrooms in the world and outlined the respective research directions and core technologies to build a smart classroom. Consequently, in this study, we reviewed the most advanced works about Smart Classroom in the world and summarized the current research directions as well as the corresponding primary functions. Besides, we also proposed the Smart Classroom model applied Artificial Intelligence and the Internet of Things which will be suitable for the facilities, culture, as well as the Vietnamese market and education environment. Bringing these features of the smart classroom with proposed technologies and features will help teachers and students experience the technology and illustrate the application of science and technology in a close and vivid way STEM topics in the context of Education 4.0 development in Vietnam.
    Type of Medium: Online Resource
    ISSN: 2588-1051
    URL: Article
    DOI: 10.32508/stdjelm.v6i2.783
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2022
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