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Glucose measurement via Raman spectroscopy of graphene:Principles and operation

nano Research 2022年第10期15卷 8697-8704页

作者： Alireza Ahmadianyazdi ngoc Hoang Lan nguyen Jie Xu Vikas Berry Department of Mechanical and Industrial Engineering University of Illinois at ChicagoChicagoIllinois 60607USA Department of Chemical Engineering University of Illinois at ChicagoChicagoIllinois 60607USA

The sensitivity of graphene’s Raman characteristics to external perturbations can be exploited for sensing *** apply this principle,Raman spectroscopy of graphene in contact with a chemical/biological analyte is recorded to unravel a correlation between analyte’s physical/chemical/biological properties and electronic properties(Fermi energy and dopants level)of *** an example,we demonstrate the principle and operation of glucose measurement using graphene’s Raman spectroscopy,utilizing both affinity and enzymatic detection *** the affinity detection,we monitor Raman spectrum of graphene in contact with a glucose containing sample to quantify the attachment of glucose onto 1-pyrene boronic acid(PBA)functionalized *** is revealed that glucose covalent bond to PBA induces n-type doping in graphene and increases its Fermi level following the Hill–Langmuir *** the enzymatic detection,we show that graphene’s Fermi energy shifts due to the biocatalytic oxidation of glucose by immobilized glucose oxidase(GOx)*** a result,graphene becomes p-doped with increasing glucose *** attribute this sensitivity to a re-distribution of ionic charges within the electric double layer(EDL)of graphene upon introducing the glucose *** model explains both our affinity and enzymatic glucose detection *** glucose detection,our graphene Raman spectroscopy-based sensor(GRS)may extend its applications to a broader range of remote and non-invasive detection without the need to employ electronics such as field-effect transistors.

关键词： graphene Raman spectroscopy glucose affinity detection glucose oxidase

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Examination of n-T_(9) conditions required by n=50,82,126 waiting points in r-process

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Communications in Theoretical Physics 2021年第10期73卷 147-157页

作者： nguyen Duy Ly nguyen ngoc Duy nguyen Kim Uyen Vinh n T Pham Faculty of Fundamental Sciences Vanlang UniversityHo Chi Minh City 700000Vietnam Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Ho Chi Minh City University of EducationHo Chi Minh City 700000Vietnam

We examined the conditions of neutron density(n) and temperature(T9) required for the n = 50, 82,and 126 isotopes to be waiting points(WP) in the r-process. The nuclear mass based on experimental data presented in the AME2020 database(AME and AME ± Δ) and that predicted using FRDM,WS4, DZ10, and KTUY models were employed in our estimations. We found that the conditions required by the n = 50 WP significantly overlap with those required by the n = 82 ones, except for the WS4 model. In addition, the upper(or lower) bounds of the n-T9 conditions based on the models are different from each other due to the deviations in the two-neutron separation *** standard deviations in the nuclear mass of 108 isotopes in the three n = 50, 82, and 126 groups are about rms = 0.192 and 0.434 Me V for the pairs of KTUY-AME and WS4-KTUY models,respectively. We found that these mass uncertainties result in a large discrepancy in the nn-T_(9) conditions, leading to significant differences in the conditions for simultaneously appearing all the three peaks in the r-process abundance. The newly updated FRDM and WS4 calculations can give the overall conditions for the appearance of all the peaks but vice versa for their old versions in a previous study. The change in the final r-process isotopic abundance due to the mass uncertainty is from a few factors to three orders of magnitude. Therefore, accurate nuclear masses of the r-process key nuclei, especially for 76 Fe,81Cu,127Rh,132Cd,192Dy, and 197Tm, are highly recommended to be measured in radioactive-ion beam facilities for a better understanding of the r-process evolution.

关键词： neutron capture r-process nuclear mass isotopic abundance precise mass measurement

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Adaptive Relaying Protocol for Decode and Forward Full-Duplex System over Rician Fading Channel: System Performance Analysis

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China Communications 2019年第3期16卷 92-102页

作者： Tan n.nguyen Minh Tran Thanh-Long nguyen Miroslav Voznak Wireless Communications Research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang University Optoelectronics Research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang University Center for Information Technology Ho Chi Minh City University of Food Industry Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava

In this paper, the system performance of a decode-and-forward(DF) full-duplex(FD) adaptive relaying network over the Rician fading environment is proposed, analyzed and demonstrated. In the first stage, the system is presented with the energy harvesting and information transmission processes. After that, the analytical expressions of the achievable throughput, the outage probability, and symbol error ratio(SER) were proposed, analyzed and demonstrated. Finally, the analytical results are also demonstrated by Monte-Carlo simulation in comparison with the closed-form expressions in the influence of the key system parameters. The results show that the analytical and simulated results match for all possible parameter values.

关键词： relaying network throughput outage probability SER wireless energy harvesting(EH)

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Constructing Collective Signature Schemes Using Problem of Finding Roots Modulo

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Computers, Materials & Continua 2022年第7期72卷 1105-1122页

作者： Tuan nguyen Kim Duy Ho ngoc nikolay A.Moldovyan School of Computer Science Duy Tan UniversityDa NangVietnam Department of Information Technology Ha NoiVietnam ITMO University St.PetersburgRussia

Digital signature schemes are often built based on the difficulty of the discrete logarithm problems,of the problem of factor analysis,of the problem of finding the roots modulo of large primes or a combination of the difficult problems mentioned *** this paper,we use the new difficult problem,which is to find the wth root in the finite ground field GF(p)to build representative collective signature schemes,but the chosen modulo p has a special structure distinct p=nt_(0)t_(1)t_(2)+1,where n is an even number and t_(0),t_(1),t_(2) are prime numbers of equal magnitude,about 80 *** characteristics of the proposed scheme are:i)The private key of each signer consists of 2 components(K_(1),K_(2)),randomly selected,but the public key has only one component(Y)calculated by the formula Y=K_(w)^(1)_(1) K^(w)_(2)^(2);w_(1)=t_(0)t_(1) and w_(2)=t_(0)t_(2);and ii)The generated signature consists of a set of 3 components(e,S_(1),S_(2)).We use the technique of hiding the signer’s public key Y,which is the coefficientλgenerated by the group nanager,in the process of forming the group signature and representative collective signature to enhance the privacy of all members of the signing collective.

关键词： Computing roots finding roots modulo collective signature signing collective signing group

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new Collective Signatures Based on the Elliptic Curve Discrete Logarithm Problem

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Computers, Materials & Continua 2022年第10期73卷 595-610页

There have been many digital signature schemes were developed based on the discrete logarithm problem on a finite *** this study,we use the elliptic curve discrete logarithm problem to build new collective signature *** cryptosystem on elliptic curve allows to generate digital signatures with the same level of security as other cryptosystems but with smaller *** extend practical applicability and enhance the security level of the group signature protocols,we propose two new types of collective digital signature schemes based on the discrete logarithm problem on the elliptic curve:i)the collective digital signature scheme shared by several signing groups and ii)the collective digital signature scheme shared by several signing groups and several individual *** two new types of collective signatures have combined the advantages of group digital signatures and collective digital *** signatures have a fixed size and do not depend on the number of members participating in the creation of the final collective *** of the advantages of the proposed collective signature protocols is that they can be deployed on top of the available public key infrastructures.

关键词： Elliptic curve signing group individual signer collective signature group signature

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EXISTEnCE AnD STABILITY OF PERIODIC AnD ALMOST PERIODIC SOLUTIOnS TO THE BOUSSInESQ SYSTEM In UnBOUnDED DOMAInS

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Acta Mathematica Scientia 2022年第5期42卷 1875-1901页

作者： Thieu Huy nguyen Truong Xuan PHAM Thi ngoc Ha VU The Sac LE School of Applied Mathematics and Informatics Hanoi University of Science and Technology Vien Toan ung dung va Tin hocDai hoc Bach khoa Hanoi 1DaiCoVietHanoiVietnam Department of Mathematics Faculty of Information TechnologyThuyloi university Khoa Cong nghe Thong tinBo mon ToanDai hoc Thuy loi175 Tay SonDong DaHa NoiViet Nam Thuyloi University Dai hoc Thuy Loi175 Tay SonDong DaHanoiViet Nam

In this paper we investigate the existence and stability of periodic solutions(on a half-line R_(+))and almost periodic solutions on the whole line time-axis R to the Boussinesq system on several classes of unbounded domains of R^(n) in the framework of interpolation *** the linear Boussinesq system we combine the L^(p)—L^(q)-smoothing estimates and interpolation functors to prove the existence of bounded mild ***,we prove the existence of periodic solutions by invoking Massera’s *** also prove the existence of almost periodic *** we use the results of the linear Boussinesq system to establish the existence,uniqueness and stability of the small periodic and almost periodic solutions to the Boussinesq system using fixed point arguments and interpolation *** results cover and extend the previous ones obtained in[13,34,38].

关键词： Boussinesq systems periodic solutions almost periodic solutions unbounded domains smoothing estimates dual estimates interpolation spaces stability

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Defect engineering of water-dispersible g-C_(3)n_(4) photocatalysts by chemical oxidative etching of bulk g-C_(3)n_(4) prepared in different calcination atmospheres

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Journal of Materials Science & Technology 2022年第8期103卷 232-243页

作者： Thi Kim Anh nguyen Thanh-Truc Pham Bolormaa Gendensuren Eun-Suok Oh Eun Woo Shin School of Chemical Engineering University of UlsanDaehakro 93Ulsan 44610South Korea Department of Material Technology Faculty of Applied ScienceHo Chi Minh City University of Technology and Education(HCMUTE)No.1 Vo Van Ngan StreetLinh Chieu WardThu Duc DistrictHo Chi Minh City 700000Viet Nam

In this study,water-dispersible graphitic carbon nitride(g-C_(3)n_(4))photocatalysts were successively prepared through the chemically oxidative etching of bulk g-C_(3)n_(4) that was polymerized thermally in different calcination atmospheres such as air,CO_(2),and n_(2).The different calcination atmospheres directly influenced the physicochemical and optical properties of both bulk and water-dispersible g-C_(3)n_(4),changing the photocatalytic degradation behavior of methylene blue(MB)and tetracycline hydrochloride(TCHCl)for water-dispersible g-C_(3)n_(4).The bubble-burst process in the thermal polymerization of thiourea produced defective edges containing C=O groups that preferred substituting the C-nHx groups over bulk g-C_(3)n_(4).In the oxygen-free n_(2) atmosphere among the different calcination atmospheres,more C=O functional groups were generated on the defective edges of bulk g-C_(3)n_(4),resulting in the highest n vacancy of the tri-s-triazine *** the successive chemical oxidation,S-or O-containing functional groups were introduced onto water-dispersible g-C_(3)n_(4).The water-dispersible g-C_(3)n_(4) photocatalyst from the oxygen-free n_(2) atmosphere(nTw)contained the most O-and S-functional groups on the g-C_(3)n_(4) ***,nTw exhibited the highest photocatalytic activity in the MB and TC-HCl photodegradation because of its slowest recombination process,which was ascribed to the unique surface properties of nTw such as abundant functional groups on the defective edges and n-deficient property.

关键词： g-C_(3)n_(4) Water-dispersible photocatalyst Calcination atmosphere Charge separation Chemically oxidative etching Defect edges

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A combination of damage locating vector method （DLV） and differential evolution algorithm （DE） for structural damage assessment

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 92-108页

作者： T. nguyen-THOI A. TRAn-VIET n. nguyen-MInH T. VO-DUY V. HO-HUU Division of Computational Mathematics and Engineering Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Division of Construction Computation Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Faculty of Civil Engineering Ton Duc Thang University Hochiminh City Vietnam

In this study, a two-stage method is presented for identifying multiple damage scenarios. In the first stage, the damage locating vector （DLV） method using normalized cumulative energy （nce） is employed for damage localization in structures. In the second stage, the differential evolution algorithm （DE） is used for damage severity of the structures. In addition, in the second stage, a modification of an available objective function is made for handing the issue of symmetric structures. To verify the effectiveness of the present technique, numerical examples of a 72-bar space truss and a one-span steel portal frame are considered. In addition, the effect of noise on the performance of the identification results is also investigated. The numerical results show that the proposed combination gives good assessment of damage location and extent for multiple structural damage cases.

关键词： damage assessment damage locating vector method (DLV) differential evolution (DE) multiple damagelocation assurance criterion (MDLAC) mode shape error function

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ISO 9000在越南行政管理应用中存在的问题与改进研究

ISO 9000在越南行政管理应用中存在的问题与改进研究

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作者： nguyen THU huyen（阮秋玄）哈尔滨工业大学

学位级别：硕士

行政服务对一个国家的政治和经济发展方面起着非常重要的作用。ISO9000质量管理体系不仅符合应用在企业管理中，而且也符合应用在公共行政管理中，所以被世界上很多国家进行运用。所以ISO9000被应用在行政管理中不仅有助于世界上很多国... 详细信息

行政服务对一个国家的政治和经济发展方面起着非常重要的作用。ISO9000质量管理体系不仅符合应用在企业管理中，而且也符合应用在公共行政管理中，所以被世界上很多国家进行运用。所以ISO9000被应用在行政管理中不仅有助于世界上很多国家解决行政管理中难以解决的复杂问题，而且这些国家也可以获得ISO9000质量管理的理论精华，工作方法，工作过程以及程序等。应用ISO9000使国家管理机关提供最好的行政服务给人民，满足人民的愿望和要求。越南国家也不例外，从2000年以来，在越南的一些机构已经实施了ISO9000，并且对越南行政改革的过程做出了重大贡献。但是在实践过程中还存在许多问题，需要改进。基于对一些国内外ISO9000质量管理体系的研究和一些管理理论展开研究。首先分析ISO在行政管理的作用，ISO9000与政府行政管理的特点，说明应用ISO9000在国家行政管理的必要性和目标。其次，本文分析了ISO9000在马来西亚和中国的应用情况，从两国应用的情况可以获得经验和教训，使ISO9000成为越南最有效的行政改革工具，提高国家的公共行政体系。然后，本文以越南文化体育及旅游部为例，详细介绍了越南文化体育与旅游部应用ISO9000的情况，取得的进展和存在的问题。特别针对在应用过程中的经费安排以及明确的实施计划等进行了系统的研究。最后，从越南应用ISO9000的情况和在微观、宏观两个层面提出措施和对策以提升ISO9000在改进质量行政管理服务的作用。研究的内容将会对越南国家行政管理应用ISO9000改进行政服务质量提供理论借鉴。

关键词：行政管理 ISO9000 质量管理体系

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Bi-Objective Optimal Control Modification Adaptive Control for Systems with Input Uncertainty

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IEEE/CAA Journal of Automatica Sinica 2014年第4期1卷 423-434页

作者： nhan T.nguyen Sivasubramanya n.Balakrishnan the nASA Ames Research Center Moffett Field the Missouri University of Science and Technology

This paper presents a new model-reference adaptive control method based on a bi-objective optimal control formulation for systems with input uncertainty. A parallel predictor model is constructed to relate the predictor error to the estimation error of the control effectiveness matrix. In this work, we develop an optimal control modification adaptive control approach that seeks to minimize a bi-objective linear quadratic cost function of both the tracking error norm and the predictor error norm simultaneously. The resulting adaptive laws for the parametric uncertainty and control effectiveness uncertainty are dependent on both the tracking error and the predictor error, while the adaptive laws for the feedback gain and command feedforward gain are only dependent on the tracking error. The optimal control modification term provides robustness to the adaptive laws naturally from the optimal control framework. Simulations demonstrate the effectiveness of the proposed adaptive control approach.

关键词： Optimal control Adaptive control Uncertainty Adaptation models Robustness Cost function nASA Learning (artificial intelligence)

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