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A comparative analysis of weight-based machine learning methods for landslide susceptibility mapping in Ha Giang area

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Big Earth Data 2023年第4期7卷 1005-1034页

作者： Thanh Trinh Binh Thanh Luu Trang Ha Thi Le duong Huy nguyen Trong Van Tran Thi Hai Van nguyen Khanh Quoc nguyen Lien Thi nguyen Faculty of Computer Science Phenikaa UniversityYen NghiaHa DongHanoi 12116Vietnam Phenikaa Research and Technology Institute(PRATI) A&A Green Phoenix Group JSCNo.167 Hoang NganTrung HoaCau GiayHanoi 11313Vietnam Northwestern Geological Division General Department of Geology and Minerals of VietnamHanoiVietnam Youth union office Thuyloi University175 Tay SonDong DaHanoiVietnam Center of Remote Sensing and Geohazards Vietnam Institute of Geosciences and Mineral ResourcesHanoiVietnam

Landslide susceptibility maps (LSMs) are very crucial for planningpolicies in hazardous areas. However, the accuracy and reliability ofLSMs depend on available data and the selection of suitable *** study is conducted to produce LSMs by combinations of machinelearning methods and weighting techniques for Ha Giang province,Vietnam, where has limited data. In study area, we gather 11 landslideconditioning factors and establish a landslide inventory *** the weights of classes (or factors) is very important toprepare data for machine learning methods to generate LSMs. Wefrst use frequency ratio (FR) and analytic hierarchy process (AHP)techniques to generate the weights. Then, random forest (RF), supportvector machine (SVM), logistic regression (LR), and AHP methods arecombined with FR and AHP weights to yield accurate and reliableLSMs. Finally, the performance of these methods is evaluated by fivestatistical metrics, ROC and R-index. The empirical results have shownthat RF is the best method in terms of R-index and the five metrics, *** rate (0.9661), FP rate (0.0), ACC (0.9835), MAE (0.0046), and RMSE(0.0350) for this study area. This study opens the perspective of weightbasedmachine learning methods for landslide susceptibility mapping.

关键词： Landslide logistic regression random forest SvM Vietnam

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Advancing Wound Filling Extraction on 3D Faces:An Auto-Segmentation and Wound Face Regeneration Approach

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 2197-2214页

作者： duong Q.nguyen Thinh D.Le Phuong D.nguyen Nga T.K.Le H.nguyen-Xuan Department of Mathematics and Statistics Quy Nhon UniversityQuy Nhon City55100Viet Nam Applied Research Institute for Science and Technology Quy Nhon UniversityQuy Nhon City55100Viet Nam CIRTECH Institute HUTECH UniversityHo Chi Minh City72308Viet Nam

Facial wound segmentation plays a crucial role in preoperative planning and optimizing patient outcomes in various medical *** this paper,we propose an efficient approach for automating 3D facial wound segmentation using a two-stream graph convolutional *** method leverages the Cir3D-FaIR dataset and addresses the challenge of data imbalance through extensive experimentation with different loss *** achieve accurate segmentation,we conducted thorough experiments and selected a high-performing model from the *** selectedmodel demonstrates exceptional segmentation performance for complex 3D facial ***,based on the segmentation model,we propose an improved approach for extracting 3D facial wound fillers and compare it to the results of the previous *** method achieved a remarkable accuracy of 0.9999993% on the test suite,surpassing the performance of the previous *** this result,we use 3D printing technology to illustrate the shape of the wound *** outcomes of this study have significant implications for physicians involved in preoperative planning and intervention *** automating facial wound segmentation and improving the accuracy ofwound-filling extraction,our approach can assist in carefully assessing and optimizing interventions,leading to enhanced patient ***,it contributes to advancing facial reconstruction techniques by utilizing machine learning and 3D bioprinting for printing skin tissue *** source code is available at https://***/SIMOGroup/WoundFilling3D.

关键词： 3D printing technology face reconstruction 3D segmentation 3D printed model

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Research Power Manager for Ad Hoc on Demand Distance Vector Routing Protocol

Research Power Manager for Ad Hoc on Demand Distance Vector ...

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作者： nguyen duong QUAN 湖南大学

学位级别：硕士

随着人们对摆脱有线网络束缚、随时随地可以进行自由通信的渴望,近几年来无线网络通信得到了迅速的发展。人们可以通过配有无线接口的便携计算机或个人数字助理来实现移动中的通信。目前的移动通信大多需要有线基础设施(如基站)的支持... 详细信息

随着人们对摆脱有线网络束缚、随时随地可以进行自由通信的渴望,近几年来无线网络通信得到了迅速的发展。人们可以通过配有无线接口的便携计算机或个人数字助理来实现移动中的通信。目前的移动通信大多需要有线基础设施(如基站)的支持才能实现。为了能够在没有固定基站的地方进行通信,一种新的网络技术——MANET技术应运而生。Mobile ad hoc network-MANET(移动自组网络)不需要有线基础设备的支持,通过移动主机自由的组网实现通信。移动自组网络的出现推进了人们实现在任意环境下的自由通信的进程,同时它也为军事通信、灾难救助和临时通信提供了有效的解决方案。在现代化战场上,各种军事车辆之间、士兵之间、士兵与军事车辆之间都需要保持密切的联系,以实现统一指挥,协同作战。这是一种典型的移动自组织网络。这种网络据报道在最近的伊拉克战争中得到应用,效果不错。MANET已被认为是未来移动通信技术的核心组成部分之一,甚至有不少人认为MANET的思想将会把所有我们能想到的网络组合在一起,从而实现世界通信网络的大统一。MANET作为一种新的组网方式,具有网络的独立性、自动配置、动态变化的网络拓扑、有限的无线通信带宽、移动终端的局限性\有限的物理安全、网络的可扩展性不强、多跳路由存在单向的无线信道、特殊的信道共享方式、有限的主机能源等特点。MANET可以看作是移动通信和计算机网络的交叉。在移动自组网络中,使用计算机网络的分组交换机制,而不是电路交换机制。通信的主机一般是便携式计算机、个人数字助理等移动终端设备。MANET不同于目前因特网环境中的移动IP网络。在移动IP网络中,移动主机可以通过固定有线网络、无线链路和拨号线路等方式接入网络,而在移动自组网络中只存在无线链路一种连接方式。在移动IP网络中,移动主机通过相邻的基站等有线设施的支持才能通信,在基站和基站(代理和代理)之间均为有线网络,仍然使用因特网的传统路由协议。而移动自组网络没有这些设施的支持。此外,在移动IP网络中移动主机不具备路由功能,只是一个普通的通信终端。当移动主机从一个区移动到另一个区时并不改变网络拓扑结构,而MANET中移动主机的移动将会导致拓扑结构的改变。MANET的应用范围很广,总体上来说,它可以用于以下场合：没有有线通信设施的地方,如没有建立硬件通信设施或有线通信设施遭受破坏;需要分布式特性的网络通信环境;现有有线通信设施不足,需要临时快速建立一个通信网络的环境;作为生存性较强的后备网络。MANET技术因其可临时组网、快速发展、无控制中心、抗毁性强等特点。在军事领域中发挥着重要作用,随着移动通信和移动终端技术的高速发展,移动自组网技术不但在军事领域得到充分的发展,而且也引起了商用领域的极大兴趣,应用范围不断拓展。同时移动自组网互联趋势也带来新的问题。例如,在灾难恢复场景中,当地警察部队可能要与消防队员、军队及医务人员通过信息交流和共享来实现相互合作,而不需要考虑每个小组使用的特殊网络技术。这样的应用情景就需要一项技术,使不同行政领域的异构MANET之间实现端对端的通信。而其中一个关键问题就是路由协议互操作问题。关于这方面的研究并未得到太多研究团体的关注,本文在这里讨论了相关工作和下一步研究方向,可以为以后的相关研究提供一些依据。MANET与传统的蜂窝技术的根本区别在于移动节点之间的通信是在没有固定基础设施(例如基站或路由器)支持的条件下进行的,系统支持动态配置和动态数据流控制,所有的网络协议也都是分布式的。网络的组织和控制并不依赖于某些重要的节点,所有节点都是平等的。允许任一节点发生故障、离开或加入网络,另一方面,网络内的所有节点都必须在一定程度上相互合作以完成网络的功能。Ad Hoc网络技术是近年来十分活跃的研究领域。然而大多数研究都集中在多跳路由这个关键技术上。本文详细介绍了AODV协议的工作原理并优化了AODV的路由重建过程,重点分析了存在的题并提出了一些解决方案。AODV(按需距离向量协议Ad Hoc On Demand Distance Vector Routing)是一种重要的MANET按需路由协议,它只当源节点需要时才生成路由,AODV路由协议以其网络开销、算法复杂度等大部分性能指标优于其它同类而受到广泛关注,被认为是最有实用前景的Ad hoc网络路由协议之一,目前已被IETF标准化。AODV路由请求RREQ,路由应答RREP和路由错误RRER, AODV主要包含路由发现,路由维护和邻居管理等过程。当源节点需要发送数据而又没有到目的节点的有效路由时,就会启动一个路由发现过程：向网络广播一个路由请求分组(RREQ),当收到请求的中间节点或目的节点有一条足够新的路由到达目的地时,中间节点或者目

关键词： MANET 电源 AODV

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Numerical investigation of the effect of seasonal variations of depthof-closure on shoreline evolution

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International Journal of Sediment Research 2021年第1期36卷 1-16页

作者： Xuan Tinh nguyen Minh Thanh Tran Hitoshi Tanaka Trung Viet nguyen Yuta Mitobe Cong Dien duong Department of Civil Engineering Tohoku University

The current study presents the effects of seasonal variations in the depth-of-closure（D;） on shoreline evolution using a numerical,one-line shoreline *** erosion of the southern beach of the Nha Trang Coast,which is located in south central of Vietnam,is selected as the study *** study area is immensely influenced by the tropical monsoon climate that has a clear pattern of large waves in the northeast monsoon season and calm waves in the non-monsoon *** analysis of the long-term measured shoreline variations from a video-camera system has found a strong correlation of these variations to the monsoon-dominated wave characteristics in the Nha Trang ***,a new approach for determining the depth-of-closure with consideration of the seasonal wave climate changes is purposed in the current *** implementing this new approach into a numerical,one-line shoreline model,it is found that the seasonal variations of D;appear to better describe the periodical shoreline evolution due to the monsoon-dominated wave characteristics for the Nha Trang *** important findings are considered to commonly apply for monsoon-dominated coastal regions in *** findings are useful information not only for scientific readers but also for the coastal authorities and managers in order to make better countermeasure plans against this kind of erosion mechanism in the future.

关键词： Video camera Shoreline change One-line theory Nha Trang Beach Depth-of-closure Monsoon wave climate

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Predicted aerodynamic damping of slender single beam structures in across-wind vibrations

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Acta Mechanica Sinica 2020年第5期36卷 990-998,I0001页

作者： Cung Huy nguyen Dinh Tung nguyen Department of Civil Engineering Industrial University of Ho Chi Minh CityHo Chi Minh City 700000Vietnam Department of Civil Engineering University of NottinghamNottingham NG72RDUK

The paper presents a generalization of the conventional analytical approach where the quasisteady theory is utilised to evalu-ate the across-wind aerodynamic damping of slender single beam *** generalized theory considers the variation of structural and aerodynamic parameters along the structural height,together with the nature of the vertical wind profile and mode ***-form solutions for typical uniform and tapered tall buildings are given.A numerical application on a prototype tall building shows that the conventional method may be oversimplified,which results in incorrect predictions of the aerodynamic damping.

关键词： Aerodynamic damping Across-wind Slender structure-Galloping Tall building

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Insights and implications from the study on meniscus reconstruction using tendon autograft

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World Journal of Orthopedics 2024年第11期15卷 1109-1111页

作者： Phi duong nguyen Thanh Kien Lam Department of Orthopaedic-Burn-Plastic Surgery City Children's HospitalHo Chi Minh City 71815Viet Nam The Faculty of Medical Technology Van Lang UniversityHo Chi Minh City 700000Viet Nam

This letter addresses the recent study by Zhu et al on the predictive factors for coronal and sagittal graft extrusion length following medial meniscus reconstruction using tendon *** study provides valuable insights into the importance of preoperative joint space width and tunnel positioning as predictors of graft ***,it found strong correlations between preoperative joint space width and medial,posterior,and mean graft extrusion at both 1 week and 8 months ***,tunnel edge distance at 1 week postoperation correlated with anterior and posterior graft *** findings offer critical guidance for improving surgical ***,the letter highlights the need for further research with larger sample sizes and comparative studies involving different graft types to strengthen these findings and broaden their applicability in clinical *** study's contributions to understanding meniscus reconstruction using tendon autografts are acknowledged,along with suggestions for future research directions.

关键词： Meniscus reconstruction Tendon autograft Graft extrusion Joint space width Tunnel positioning Surgical outcomes

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Transient responses of double-curved sandwich two-layer shells resting on Kerr's foundations with laminated three-phase polymer/GNP/fiber surface and auxetic honeycomb core subjected to the blast load

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Defence Technology（防务技术） 2024年第5期35卷 222-247页

作者： nguyen Thi Hai Van Thi Hong nguyen Researcher&Lecturer Faculty of Industrial EducationThe University of Danang-University of Technology and Education48 Cao ThangDanang550000Viet Nam Researcher&Lecturer Faculty of Mechanical EngineeringThuyloi University175 Tay SonDong DaHanoi100000Viet Nam

This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-curved sandwich two-layer shells made of auxetic honeycomb core and laminated three-phase polymer/GNP/fiber surface subjected to the blast *** of the two layers that make up the double-curved shell structure is made up of an auxetic honeycomb core and two laminated sheets of three-phase polymer/GNP/*** exterior is supported by a Kerr elastic foundation with three *** key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfaces of each *** contrast to previous first-order shear deformation theories,no shear correction factor is ***'s exact solution was used to treat the double-curved shell problem with a single title boundary,while the finite element technique and an eight-node quadrilateral were used to address the other boundary *** ensure the accuracy of these results,a thorough comparison technique is employed in conjunction with credible *** problem model's edge cases allow for this kind of *** study's findings may be used in the post-construction evaluation of military and civil works structures for their ability to sustain explosive *** addition,this is also an important basis for the calculation and design of shell structures made of smart materials when subjected to shock waves or explosive loads.

关键词： Blast load Two-layer shell Polymer/GNP/Fiber surface Auxetic honeycomb Shear connectors

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Effect of Poly-Alkylene-Glycol Quenchant on the Distortion, Hardness, and Microstructure of 65Mn Steel

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Computers, Materials & Continua 2021年第6期67卷 3249-3264页

作者： Thi Xuan Tran Xuan Phuong nguyen duong Nam nguyen Dinh Toai Vu Minh Quang Chau Osamah Ibrahim Khalaf Anh Tuan Hoang Hanoi University of Science and Technology HanoiVietnam Ho Chi Minh City University of Transport Ho Chi Minh CityVietnam Vietnam Maritime University HaiphongVietnam Industrial University of Ho Chi Minh City(IUH) Ho Chi Minh CityVietnam Al-Nahrain Nanorenewable Energy Research Center Al-Nahrain UniversityBaghdadIraq Ho Chi Minh city University of Technology(HUTECH) Ho Chi Minh CityVietnam

Currently,the 65Mn steel is quenched mainly by oil *** though the lower cooling rate of oil compared to water reduces the hardness of steel post quenching,the deforming and cracking of parts are often *** the other hand,the oil media also has the disadvantage of being ammable,creating smoke that adversely affects the *** poly alkylene glycol(PAG)polymer quenchant is commonly used for quenching a variety of steels based on its advantages such as non-ammability and exible cooling rate subjected to varying concentration and stirring *** article examines the effect of PAG polymer quenching solution(with concentrations of 10%and 20%)on deformation,hardness,and microstructure of C-ring samples made of 65Mn ***,the performance of PAG polymer quenchant is also compared with those of two common quenching solutions:Water and *** cooling in water,the C-ring samples had the largest deformation and 2 times higher than the results obtained when a 10%PAG solution was *** particular,similar levels of deformation on the C-ring samples were observed in both cases of 20%PAG solution and oil as the primary quenching ***,the hardness level measured between the sampled parts quenched in the 20%PAG solution appeared to be more uniform than that obtained from the oil-quenched *** study of the microscopic structure of steel by optical microscopy combined with X-ray diffraction showed that the water hardened sample exhibited cracks and comprised of two phases,martensite and retained *** to the results of Electron Back Scattering Diffraction(EBSD)analysis and backscattering electronic image(BSE),the content of austenite residue in the sample when the sample was cooled in PAG 10 and 20%solution was 3.21%and 4.73%,respectively and smaller than the measurements obtained from oil quenching ***,the 65Mn steel is cooled in 20%PAG solution for high hardness and more evenly distributed than when it is q

关键词： Polyethylene glycol electron backscattering diffraction quenching media cooling rate backscattering electronic image

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Structured Learning in Biological Domain

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Journal of Systems Science and Systems Engineering 2020年第4期29卷 440-453页

作者： Canh Hao nguyen Bioinformatics Center Instute for Chemical ResearchKyoto UniversityUjiKyotoJapan

Biological domain has been blessed with more and more data from biotechnologies as well as data integration *** the renaissance of machine learning and artificial intelligence,there is so much promise of data-driven biological knowledge ***,it is not straight forward due to the complexity of the domain knowledge hidden in the *** any level,be it atoms,molecules,cells or organisms,there are rich interdependencies among biological *** learning approaches in this domain usually involves analyzing interdependency structures encoded in graphs and related *** this report,we review our work in developing new Machine Learning methods for these applications with improved performances in comparison with state-of-the-art *** show how the networks among biological components can be used to predict properties.

关键词： Structured learning sparse modeling systems biology deep learning

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A time-domain estimation method of rapidly time-varying channels for OFDM-based LTE-R systems

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Digital Communications and Networks 2019年第2期5卷 94-101页

作者： Jin-Kyu Choi Van Due nguyen Hai Nam nguyen Van Vinh duong Tien Hoa nguyen Hanbyeog Cho Hyun-Kyun Choi Seong-Gyoon Park Smart Mobility Research Department of ETR1 DaejeonSouth Korea School of Electronics and Telecommunicalions HUSTViet Nam Electronics and Telecommunications Research Institute DaejeonSouth Korea School of Information and Communication in KongJu National University South Korea

This paper addresses the performance of fast doubly selective fading channel estimation combined with InterCarrier Interference (ICI) cancellation for Long Term Evolution (LTE) communication platform in the High Speed Railway (HSR) environment. We consider the Channel Impulse Response (CIR) coefficients with a critical Doppler frequency shift and multi-path fading that were taken from the WINNER II channel model and the D2a propagation scenario, where the conditions of HSR are analyzed. As multi-path fading increases and the channel varies in the order of the symbol period, we first propose a novel approach for designing a pilot symbol structure in the time domain. Then, we describe the deployment of the proposed pilot symbol structure to estimate the channel in the time domain. Channel information corresponding to the data positions is obtained by linear interpolation. In each OFDM symbol, the slope and the initial value for establishing an interpolation function are estimated to adapt to the time variation of the channel. An accurate estimate of channel state information is used for the purpose of ICI cancellation. The simulation results show that the channel estimated by our proposed method can follow the real channel well, even in a very high Doppler frequency. The estimation method in terms of Mean Squared Error (MSE) significantly outperforms the state-of-the-art methods. The combination of our channel estimator with several interference cancelers provides a considerably better system performance than that achieved when frequency channel estimation is used.

关键词： ICI cancellation OFDM Channel estimation LTE-R

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