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Monte Carlo simulation of a cone-beam CT system for lightweight casts

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Radiation Detection Technology and Methods 2021年第4期5卷 504-512页

作者： Thuy Duong Tran ngoc Ha Bui Kim tuan Tran ngoc Toan Tran Department of Nuclear Engineering and Environmental Physics School of Engineering PhysicsHanoi University of Science and Technology01 Dai Co VietHai Ba TrungHanoiVietnam Vietnam Atomic Energy Institute 59 Ly Thuong KietHoan KiemHanoiVietnam

Cone-beam computed tomography(CBCT),a modern technique with many applications,is becoming increasingly important and essential in many areas of economics and *** equipment has been commercialized in both hardware and ***,having a device system suitable for a specific group of objects will be the *** work used Monte Carlo simulation to optimize the design of a Cone-beam Computed Tomography(CBCT)for lightweight and small-size *** affecting image quality such as radiation-source,flat-panel detector,and geometrical distance were *** results indicate that an X-ray generator with a focal spot size of 4×4µm^(2),high voltage of 240 kV,and a radiation intensity of 10^(13) photon/s with a flat panel CsI(Tl)detector of 0.3 mm thickness and a pixel size of 0.1–0.2 mm,is suitable for a CBCT to inspect small objects in *** Monte Carlo model was validated against experiments and to evaluate some characteristics of the existing system.

关键词： Cone-beam computed technology Monte Carlo simulation Lightweight casts in industry Applied radiation

Self-supervised image quality assessment for X-ray tomographic images of Li-ion battery

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npj Computational Materials 2022年第1期8卷 1848-1856页

作者： Kai Zhang tuan-Tu nguyen Zeliang Su Arnaud Demortière Laboratoire de Réactivitéet Chimie des Solides(LRCS) CNRS UMR 7314UPJVHub de l’Energie15 rue Baudelocque80039Amiens CedexFrance ENSTA Paris 91120PalaiseauFrance Renault Technocentre 78084GuyancourtFrance Réseau sur le Stockage Electrochimique de l’Energie(RS2E) CNRS FR 3459Hub de l’EnergieRue Baudelocque80039Amiens CedexFrance ALISTORE-European Research Institute CNRS FR 3104Hub de l’EnergieRue Baudelocque80039Amiens CedexFrance

Image perception plays a fundamental role in the tomography-based approaches for microstructure characterization and has a deep impact on all subsequent stages of image processing,such as segmentation and 3D *** enhancement of image perception,however,frequently involves observer-dependence,which reflects user-to-user dispersion and uncertainties in the calculated *** work presents an objective quantitative method,which uses convolutional neural networks (CNN) for the quality assessment of the X-ray tomographic *** only dozens of annotations,our method allows to evaluate directly and precisely the quality of tomographic *** metrics were employed to evaluate the correlation between our predicted scores and subjective human *** evaluation results demonstrate that our method can be a direct tool to guide the enhancement process in order to produce reliable segmentation *** processing of the tomographic image can thus evolve into a robust observer-independent procedure and advance towards the development of an efficient self-supervised approach.

关键词： image networks battery

Spherical Fuzzy WASPAS-based Entropy Objective Weighting for International Payment Method Selection

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Computers, Materials & Continua 2022年第7期72卷 2055-2075页

作者： Phi-Hung nguyen Thanh-tuan Dang Kim-Anh nguyen Hong-Anh Pham Faculty of Business FPT UniversityHanoi100000Vietnam Department of Business Management National Taipei University of TechnologyTaipei1068Taiwan Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan

In international trade,exporters prefer to receive payments as quickly as possible,and importers want to make payments as late as *** this respect,the payment field,an essential condition for trade transactions,also represents the positions of exporters and importers *** addition,there are many cases in which various variables must be considered rather than only one specific variable representatively affecting payment,particularly in the case of import-export Small and Medium-Sized Enterprises(SMEs)from emerging countries.A selection of proper payment methods can be categorized as a Multi-Criteria Decision-Making(MCDM)***,this study aims to propose a novel and efficient Spherical Fuzzy Weighted Aggregated Sum Product Assessment based Entropy Objective Weighting method(SF-EW and WASPAS-SF)to evaluate international payment methods with uncertain ***,SF-EW model is applied to determine the relative weights of critical ***,international payment method alternatives are prioritized by the WASPAS-SF *** essential factors for four international payment methods are proposed based on experts’opinions and the existing literature.A real-world case study from Vietnamese import-export SMEs is presented to validate the applicability of the proposed *** results indicated that“Characteristics of payment method(PA)”had the most significant impact on international payment method *** comparison,“Letters of Credit(L/C)”was the most reliable payment method with the highest ranking available to international ***,a sensitivity analysis was performed to examine the validity and robustness of the proposed decision support ***,this study could contribute to international payment services and in the context of globalization and international trade.

关键词： International payment Vietnam MCDM spherical fuzzy theory entropy WASPAS

Surface PEGylation of hollow mesoporous silica nanoparticles via aminated intermediate

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Progress in Natural Science:Materials International 2019年第6期29卷 612-616页

作者： Thi ngoc Tram nguyen Diem-Huong nguyen-Tran Long Giang Bach Tran Hoang Du Truong ngoc Thuy Trang Le Dai Hai nguyen Tra Vinh University Institute of Applied Materials Science Vietnam Academy of Science and Technology Graduate University of Science and Technology Vietnam Academy of Science and Technology nguyen Tat Thanh University 5. Institute of Research and Development Duy Tan University

A hybrid of organic/inorganic system, hollow mesoporous silica nanoparticles functionalized with poly(ethylene glycol), was synthesized in the presence of coupling agent and aminated ends. Doxorubicin(DOX) was used as a model drug to evaluate the effect of PEGylation on the loading capacity and release pattern of the *** with transmission electron microscopy(TEM) and scanning electron microscopy(SEM), X-ray diffraction(XRD), nitrogen adsorption-desorption, thermogravimetric analysis(TGA) and Fourier transformed infrared(FTIR) confirmed the PEG conjugation, as well as the amorphous mesoporous nature of the synthesized particles. Due to the capping effect of PEG molecules over the pores in the silica structure, the synthesized system was able to retain higher amount of cargo and establish a controlled manner when releasing.

关键词： Hollow mesoporous silica nanoparticles mPEG PEGylation Surface modification

Ardisia gigantifolia ethanolic extract inhibits cell proliferation and targets cancer stem cells in gastric cancer

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Asian Pacific Journal of Tropical Biomedicine 2023年第6期13卷 258-267页

作者： Thi Thanh Huong Le Phu Hung nguyen Van Phuong nguyen Thy ngoc nguyen Faculty of Biotechnology TNU-University of SciencesThai NguyenVietnam Department of Life Science University of Science and Technology of HanoiVietnam Academy of Science and TechnologyHanoiVietnam

Objective:To evaluate the effects of ethanol extract from Ardisia gigantifolia leaves on cell proliferation and cancer stem cell(CSC)number in gastric ***:The inhibitory effect of Ardisia gigantifolia extract on the proliferation of MKN45 and MKN74 gastric cancer cells was assessed using 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide ***-adherent culture(3D)model was used to evaluate the effect of the extract on tumorsphere size and ***,the expression of CD44,ALDH,and p21 was determined by immunofluorescence *** cytometric analysis was performed to evaluate cell cycle arrest and the expression of gastric CSC markers CD44 and ***-time PCR analysis was also carried out to assess the effect of the extract on the expression of cell cycle-regulated ***:Ardisia gigantifolia extract effectively inhibited cell proliferation with an IC_(50)of 55.7μg/m L in MKN45 cells and 123.6μg/m L in MKN74 *** extract also arrested cell cycle in the G_(0)/G_(1)phase as well as significantly reduced the size and number of *** markedly increased expression of p21 was observed at both m RNA and protein levels in the extract-treated adherent cells and *** addition,Ardisia gigantifolia extract significantly reduced the number of CD44-and/or ALDH-expressing gastric ***:The development of gastric CSC can be inhibited by the ethanol extract of Ardisia gigantifolia.

关键词： Ardisia gigantifolia Gastric cancer Cancer stem cell markers CD44 ALDH

Performance Evaluation of Food and Beverage Listed Companies in Vietnam

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Computers, Materials & Continua 2022年第11期73卷 3575-3593页

作者： Jung-Fa Tsai ngoc Huyen nguyen Ming-Hua Lin Department of Business Management National Taipei University of TechnologyTaipei10608Taiwan Department of Urban Industrial Management and Marketing University of TaipeiTaipei11153Taiwan

During the last decade,the food and beverage industry has been one of the most significant and prioritized industries that contributed to the economic growth in ***,how to enhance the performance of food and beverage firms has become a critical factor for Vietnam’s economic *** research aims to use the data envelopment analysis(DEA)and the Malmquist productivity index(MPI)to assess changes in operational performance and productivity of listed lead food and beverage firms in Vietnam during the period between 2015 and *** obtained results reveal that Vietnamese food and beverage firms were generally inefficient between 2015 and 2020 because the number of relatively inefficient companies was higher than the relatively efficient ones in each year between 2015 and *** MPI findings indicate the growth in productivity during the study period as a result of technological *** integrating the findings of the relative efficiency and productivity change,this study creates five decision-making matrixes for five periods,respectively,from 2015 to 2020 to position the food and beverage firms in each *** analytical results provide instructions to senior managers on developing strategy for increasing efficiency of food and beverage listed companies in Vietnam.

关键词： Food and beverage industry data envelopment analysis Malmquist productivity index super-SBM model efficiency productivity

Determination of Helmert transformation parameters for continuous GNSS networks:a case study of the Géoazur GNSS network

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Geo-Spatial Information Science 2023年第1期26卷 125-138页

作者： Dinh Trong Tran Jean-Mathieu Nocquet ngoc Dung Luong Dinh Huy nguyen Department of Geodesy and Geomatics Engineering Hanoi University of Civil EngineeringHanoiVietnam UniversitéCôte d’Azur CNRSObservatoire de la Côte d’AzurIRDValbonneFrance

In this paper,we propose an approach to determine seven parameters of the Helmert transfor-mation by transforming the coordinates of a continuous GNSS network from the World Geodetic System 1984(WGS84)to the International Terrestrial Reference *** includes(1)convert-ing the coordinates of common points from the global coordinate system to the local coordinate system,(2)identifying and eliminating outliers by the Dikin estimator,and(3)estimating seven parameters of the Helmert transformation by least squares(LS)estimation with the“clean”data(*** removed).Herein,the local coordinate system provides a platform to separate points’horizontal and vertical ***,the Dikin estimator identifies and eliminates outliers in the horizontal or vertical component *** is significant because common points in a continuous GNSS network may contain *** proposed approach is tested with the Géoazur GNSS network with the results showing that the Dikin estimator detects outliers at 6 out of 18 common points,among which three points are found with outliers in the vertical compo-nent ***,instead of eliminating all coordinate components of these six common points,we only eliminate all coordinate components of three common points and only the vertical component of another three common ***,the classical LS estimation is applied to“clean”data to estimate seven parameters of the Helmert transformation with a significant accuracy *** Dikin estimator’s results are compared to those of other robust estimators of Huber and Theil-Sen,which shows that the Dikin estimator performs ***,the weighted total least-squares estimation is implemented to assess the accuracy of the LS estimation with the same *** inter-comparison of the seven estimated parameters and their standard deviations shows a small difference at a few per million levels(E-6).

关键词： Continuous GNSS tectonic geodesy Dikin estimation Helmert transformation

Land subsidence prediction for a new urban mass rapid transit line in Hanoi

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Underground Space 2020年第2期5卷 93-104页

作者： Pham Huy Giao Vu Thi Hue nguyen Dang Han nguyen Thi Hai Anh nguyen ngoc Minh Asian Institute of Technology BangkokThailand Institute of Foundation and Underground FECONHanoiViet Nam Sonhai JSC Viet Nam

The rapidly increasing population,urbanization,and industrialization of Hanoi city in the last few decades have necessitated the urgent development of a new underground public transport infrastructure such as the urban mass rapid transit(UMRT)system that is now under ***,concerns on the possible effects of land subsidence on the to-be-constructed and operated UMRT lines must be *** of the difficulties while assessing land subsidence in Hanoi is the insufficient subsidence monitoring ***,a good geotechnical characterization of the subsoil profile and proper numerical analysis can help predict groundwater pumping-induced subsidence *** UMRT line No.2 that was selected for this study is special as it runs across the old quarter downtown,located at the very heart of Hanoi *** this paper,the Hanoi aquifer system,groundwater extraction,and subsidence monitoring network of Hanoi are reviewed *** data from 30 investigation boreholes were analyzed to characterize the subsoil profile underlying a segment of the UMRT line No.2 that consists of both elevated and underground *** soil layers were identified up to a depth of 50 m,including a compressible soft clay layer 10-15 m thick that is supposed to be most vulnerable to subsidence by groundwater *** on the long-term groundwater monitoring data,one-dimensional finite element method(FEM)consolidation analyses were carried out for three drawdown boundary conditions of 5,10,and 15 m and yielded a total subsidence of 0.15,0.35,and 0.5 m,respectively,after 25 years with 1994 as the reference *** results of this study confirmed that land subsidence in particular should be considered in the construction and maintenance of the UMRT lines in Hanoi,in particular for underground sections that are founded on soft to medium clay layers.

关键词： Hanoi aquifer system Groundwater pumping Land subsidence UMRT line Geotechnical characterization

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越南医籍《海上懒翁医宗心领》版本考

中医药文化 2024年第4期19卷 325-332页

作者：芮芸杨丽娜阮明玉上海中医药大学图书馆上海201203 上海中医药大学科技人文研究院上海201203 越南菲尼卡大学河内12116

《海上懒翁医宗心领》是越南第一部内容完备的医学全书,在越南医学史上有里程碑的意义。该书由越南医家黎有卓所著,早期以手稿本或传抄本形式流传于其弟子之间,名为《懒翁心领》,经后人搜集、刊印,于咸宜元年(1885)刊刻出版,名为《新镌... 详细信息

《海上懒翁医宗心领》是越南第一部内容完备的医学全书,在越南医学史上有里程碑的意义。该书由越南医家黎有卓所著,早期以手稿本或传抄本形式流传于其弟子之间,名为《懒翁心领》,经后人搜集、刊印,于咸宜元年(1885)刊刻出版,名为《新镌海上懒翁医宗心领全帙》。通过考据该书版本的发生发展过程以及发展过程中形成的相互关系,梳理该书不同版本之间的源流演变,为今人研究越南医家黎有卓医学思想在越南的发展脉络提供参考。

关键词：《海上懒翁医宗心领》越南医籍版本考证域外汉籍