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A Novel Incremental Attribute Reduction Algorithm Based on Intuitionistic Fuzzy Partition Distance

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Computer Systems Science & Engineering 2023年第12期47卷 2971-2988页

作者： Pham Viet Anh Nguyen Ngoc Thuy Nguyen Long Giang Pham dinh khanh Nguyen The Thuy Graduate University of Science and Technology Vietnam Academy of Science and TechnologyHanoi100000Vietnam Institute of Information Technology Vietnam Academy of Science and TechnologyHanoi100000Vietnam HaUI Institute of Technology Hanoi University of IndustryHanoi100000Vietnam Faculty of Information Technology University of SciencesHue UniversityHue530000Vietnam AI Research Department Neurond Technology JSCHanoi100000Vietnam Information and Communication Technology Center Department of Information and CommunicationsBacninh790000Vietnam

Attribute reduction,also known as feature selection,for decision information systems is one of the most pivotal issues in machine learning and data *** based on the rough set theory and some extensions were proved to be efficient for dealing with the problemof attribute ***,the intuitionistic fuzzy sets based methods have not received much interest,while these methods are well-known as a very powerful approach to noisy decision tables,i.e.,data tables with the low initial classification ***,this paper provides a novel incremental attribute reductionmethod to dealmore effectivelywith noisy decision tables,especially for highdimensional *** particular,we define a new reduct and then design an original attribute reduction method based on the distance measure between two intuitionistic fuzzy *** should be noted that the intuitionistic fuzzypartitiondistance iswell-knownas aneffectivemeasure todetermine important *** interestingly,an incremental formula is also developed to quickly compute the intuitionistic fuzzy partition distance in case when the decision table increases in the number of *** formula is then applied to construct an incremental attribute reduction algorithm for handling such dynamic ***,some experiments are conducted on real datasets to show that our method is far superior to the fuzzy rough set based methods in terms of the size of reduct and the classification accuracy.

关键词： Incremental attribute reduction intuitionistic fuzzy sets partition distance measure dynamic decision tables

不同围岩条件下偏压隧道初期支护优化设计研究——以鹤大高速公路回头沟隧道为例

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不同围岩条件下偏压隧道初期支护优化设计研究——以鹤大高速公路...

作者： NGUYEN dinh hoan.阮庭环）吉林大学

学位级别：硕士

由于偏压隧道的复杂性,通过工程类比法设计出的初期支护在实际工程的施工和运营期间出现了许多问题,因此对于地形偏压隧道的初期支护结构有必要进行深入的研究、优化设计。本文结合在建隧道的浅埋偏压段,通过资料调研、理论分析和数值... 详细信息

由于偏压隧道的复杂性,通过工程类比法设计出的初期支护在实际工程的施工和运营期间出现了许多问题,因此对于地形偏压隧道的初期支护结构有必要进行深入的研究、优化设计。本文结合在建隧道的浅埋偏压段,通过资料调研、理论分析和数值模拟对偏压隧道的初期支护体系提出锚杆长度、锚杆间距和喷混凝土厚度的优化设计。本文采用MIDAS/GTS/NX有限元数值模拟软件建立二维数值模型,根据原设计方案与《公路隧道设计规范》(JTG D70-2004)设计出锚杆长度、间距以及喷射混凝土层厚度的各个工况,进行模拟分析研究,最终结合工程经济性做出优化设计。通过研究得出以下成果:1.根据回头沟隧道工程地质条件,几何参数和围岩的物理力学特性建立了相应的数值模拟模型,利用数值方法对偏压隧道初期支护进行了模拟分析。给出了各设计工况产生的隧道特征位移、衬砌轴应力与弯矩、围岩塑性区、锚杆轴力等,并对其进行研究分析。最终给出回头沟隧道IV级和V级围岩条件下初期支护的优化设计方案。2.分析比较了埋深为5m,10m,15m,地表倾角为15°,30°,45°各组合条件下,隧道不同初期支护设计的支护效果,通过比较塑性区分布情况以及围岩压力,周围位移,衬砌受力,可知:(1)对于偏压隧道,埋深和地表倾角均会影响到隧道初期支护的受力,因此要综合考虑隧道的埋深和地表倾角。(2对于偏压隧道,采用非对称的支护结构设计较对称设计更为合理。3.依据优化方案,对该隧道的施工进行指导,保障其安全与稳定。

关键词：偏压隧道初期支护不同围岩级别优化设计

Tuning the inhomogeneous charge transport in ZnO interfaces for ultrahigh on/off ratio top-gated field-effect-transistor arrays

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Nano Research 2020年第11期13卷 3033-3040页

作者： Thanh Luan Phan dinh Loc Duong Tuan khanh Chau Sidi Fan Won Tae Kang Thi Suong Le Hyun Yong Song Linfeng Sun Van Tu Vu Min Ji Lee Quoc An Vu Young Hee Lee Woo Jong Yu Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwon16419Republic of Korea Center for Integrated Nanostructure Physics(CINAP) Institute for Basic Science(IBS)Suwon16419Republic of Korea Department of Energy Science Sungkyunkwan UniversitySuwon16419Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon16419Republic of Korea

The interface between oxide/oxide layers shows an inhomogeneous charge transport behavior,which reveals a high conductivity owing to *** typical example is the hetero-interface between ZnO film and other wide band gap oxides(e.g.,Al_(2)O_(3),TiO_(2),and HfO_(2)).It is thus quite evident that the ZnO/other oxides hetero-interface contains high density electron carriers effectively screening the gate-induced electric ***,an extremely weak gate modulation in ZnO film was showed,resulting in very low on/off ratio of 1.69 in top-gate field-effect-transistor(TG-FET)***,to extend the usage of ZnO TG-FET is not quite possible toward further practical ***,we clarified the correlation of inhomogeneous region in oxide/oxide hetero-junction by systematically *** work suggests that a self-assembly of molecules(SAM)buffer layer is suitable for tuning the inhomogeneous charge transport in ZnO film,which not only reduces the interface trap density,but also effectively enhances the gate electric field modulation at the *** further report the robust fabrication of TG-FET arrays based on ZnO thin film,using an ultra-thin alkylphosphonic acid molecule monolayer as buffer *** device demonstrates a pronounced ultrahigh on/off ratio of≥10^(8),which is 8-order of magnitude higher than that of a device without buffer *** the highly reliable arrays,our device exhibits a high yield of over 93%with an average on/off ratio of^10^(7) across the entire wafer scale,mobility(18.5 cm^(2)/(V·s)),an extended bias-stressing(~2,000 s)and long-stability(~150 days)under ambient conditions.

关键词： zinc oxides thin-film field-effect-transistor self-assembly molecule inhomogeneous charge transport interface engineering

Facile Preparation, Characterization of Flexible Organic Solar Cells Using P3HT-MWCNTS Composite Photoactive Layer

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Journal of Materials Science and Chemical Engineering 2020年第10期8卷 1-10页

作者： Tran Si Trong khanh Nguyen Phuong Hoai Nam Nguyen Nang dinh Advanced Research Group of Nano-Semiconducting Materials and Devices (ARGD) University of Engineering and Technology VNU in Hanoi Hanoi Vietnam

Multiwalled carbon nanotubes (MWCNTs) mixed in poly(3-hexylthiophene) (P3HT) were used as a photoactive layer for organic solar cells (OSC). The flexible OSCs of a structure of PET/rGO-P3HT/P3CT/PCBM/LiF-Al were prepared by spincoating. The UV-Vis absorption spectra of the photoactive films and current-voltage characteristics of the OSCs showed the advantage of the composite devices above the pristine-polymeric ones. Under illumination of light with a 100 mW/cm2-powerdensity, the photoelectrical conversion efficiency (PCE) of the OSCs with 3.0 wt% MWNCTs embedded in the photoactive layer possess a value as large as 2.35%. The obtained results suggest further useful applications of the flexible large-area solar cells.

关键词： P3HT-MWCNTs Composite Photovoltage UV-Vis Absorption Photoluminescence (PL) Quenching J-V Characteristics Photoelectrical Conversion Efficiency (PCE)

Magnetic Force Enhanced Sustainability and Power of Cam-Based Triboelectric Nanogenerator

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Research 2021年第1期2021卷 370-380页

作者： Hakjeong Kim Hee Jae Hwang Nghia dinh Huynh khanh Duy Pham Kyungwho Choi Dahoon Ahn Dukhyun Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYongin 17104Republic of Korea Department of Mechanical Engineering Korea Aerospace UniversityGoyang 10540Republic of Korea Division of Mechanical Engineering Kongju National UniversityCheonan 31080Republic of Korea

Since the first invention of triboelectric nanogenerators(TENGs)in 2012,many mechanical systems have been applied to operate TENGs,but mechanical contact losses such as friction and noise are still big obstacles for improving their output performance and ***,we report on a magnet-assembled cam-based TENG(MC-TENG),which has enhanced output power and sustainability by utilizing the non-contact repulsive force between the *** investigate the theoretical and experimental dynamic behaviors of MC-TENGs according to the effects of the contact modes,contact and separation times,and contact forces(i.e.,pushing and repulsive forces).We suggest an optimized arrangement of magnets for the highest output performance,in which the charging time of the capacitor was 2.59 times faster than in a mechanical cam-based TENG(C-TENG).Finally,we design and demonstrate a MC-TENG-based windmill system to effectively harvest low-speed wind energy,~4 m/s,which produces very low ***,it is expected that our frictionless MC-TENG system will provide a sustainable solution for effectively harvesting a broadband of wasted mechanical energies.

关键词： friction magnets generator

Assessing the Vulnerability of Agricultural Production Activities in the Coastal Area of Thua Thien Hue Province, Vietnam by GIS Analysis Tools

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Journal of Geoscience and Environment Protection 2019年第5期7卷 116-130页

作者： Nguyen hoan. Son Dao dinh Cham Phan Anh Hang Nguyen Trong Quan Nguyen Thanh hoan University of Education Hue University Hue Vietnam Institute of Geography Vietnam Academy of Science and Technology Hanoi Vietnam Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi Vietnam University of Science Hue University Hue Vietnam

Using Geography Information System (GIS) tools and remote sensing data in assessing the level of vulnerability of agricultural production activities in the coastal area has become more efficient in the recent years. This research has identified the sensitivity index (S) (including the traffic access index;the impact of residential areas;the impacts of industrial zones;the community dependence level), exposure index (E) (the sea level rises to 2100;the temperature change to 2100), the adaptable capacity index (AC) (slope;morphology), thereby synthesizing the vulnerability index (V). Based on the indexes to calculate vulnerability, the high to very high vulnerability area is 37,081.44 ha, accounting for 68.09%;the average vulnerability level is 15,286.49 ha, accounting for 28.07%;the low to very low vulnerability level with an area is 2087.82 ha, accounting for 3.84% of the total area. With a high and very high vulnerability accounting for 68.09%, there will be great influences on the lives of resident in the area, especially agricultural production.

关键词： Vulnerability Indexes GIS Tools Agricultural Production Activity Coastal Areas

An Optimal Weight Method for CT Image Denoising

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Journal of Electronic Science and Technology 2012年第2期10卷 124-129页

作者： dinh hoan.Trinh Marie Luong Jean-Marie Rocchisani Canh Duong Pham Huy Dien Pham Francoise Dibos the LAGA Laboratory Université Paris 13 Sorbonne Paris CitéF-93430 Villetaneuse France the L2TI Laboratory Université Paris 13 Sorbonne Paris CitéF-93430 Villetaneuse France the Hopital Avicenne-Medicine Nucleaire the CIID Laboratory Vietnam Academy of Science and Technology

This paper proposes a novel exemplar- based method for reducing noise in computed tomography （CT） images. In the proposed method, denoising is performed on each block with the help of a given database of standard image blocks. For each noisy block, its denoised version is the best sparse positive linear combination of the blocks in the database. We formulate the problem as a constrained optimization problem such that the solution is the denoised block. Experimental results demonstrate the good performance of the proposed method over current state-of-the-art denoising methods, in terms of both objective and subjective evaluations.

关键词： Constrained quadratic programming computed tomography image exemplar-based denoising.

Isolation and characterization of five novel mini-M conotoxins from the venom of mollusk-hunter snail Conus bandanus

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Asian Pacific Journal of Tropical Biomedicine 2020年第8期10卷 343-352页

作者： Nguyen Bao Jean-Pière LE CAER Phan Thi khanh Vinh Faculty of Food Technology Nha Trang University02 Nguyen Dinh ChieuNha TrangKhanh HoaVietnam Institut de Chimie des Substances Naturelles Centre de Recherche de Gif-FRC3115-UPR 2301F-91198 Gif-sur-YvetteFrance

Objective:To determine the new M-superfamily conotoxins from molluscivorous snail Conus bandanus in ***:Conus bandanus venom was fractionated and purified on HPLC system with an analytical reversed-phase C18 column in order to screen small *** primary structure of peptide was analyzed by matrix-assisted laser desorption/ionization time of flight tandem mass spectrometry using collision-induced dissociation and confirmed by Edman’s degradation ***:Five new conotoxins were biochemically characterized from the crude venom of the mollusk-hunting cone snail Conus bandanus,which were collected at Ke Ga reef of the Nha Trang Bay(Vietnam).Each conotoxin had 15 or 16 amino acid residues and shared the same characteristic cysteine framework V as–CC–C–C–CC–.They were termed as Bn3 b,Bn3 c,Bn3 d,Bn3 e and Bn3 f following the conotoxins ***:The conotoxins Bn3 b,Bn3 e,and Bn3 f are categorized in the mini-M conotoxins of the M1 branch,while conotoxins Bn3 c and Bn3 d are categorized in the mini-M conotoxins of the M2 *** homological analysis reveals that these conotoxins could serve as promising probe compounds for voltage-gated sodium channels.

关键词： Mini-M conotoxin Conus bandanus Cone snail venom

Evaluation of Interaction between Surface Water and Groundwater in the South of Hanoi City by Stable Isotope Technique

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Journal of Environmental Protection 2022年第11期13卷 870-880页

作者： Vo Thi Anh Tran khanh Minh Ha Lan Anh Mai dinh Kien Vu Hoai Dang Duc Nhan Institute for Nuclear Science and Technology Hanoi Vietnam

The δ18O and δ2H stable isotope techniques for studying properties of groundwater and surface help us to understand more clearly about the distribution and movement of groundwater in the South of Hanoi area. There were 68 water samples from the studying area and analyzed by a Liquid Water Isotope Analyzer (LWIA-24D). The stable isotope values of the groundwater from Pleistocene aquifers were range from -3.21‰ to -9.55‰ δ18O and -35.32‰ to -67.44‰ δ2H;rainwater from -8.18‰ to -4.13‰ δ18O and -61.19‰ to -17.93‰ δ2H;Red river water from -7.51‰ to -5.29‰ δ18O and -51.60‰ to -38.99‰ δ2H. Based on stable isotope characteristics, the results show that there was a relationship between surface water and groundwater in the South of Hanoi city. It is that groundwater recharges for river water in the dry season with 74%, and in the rainfall season groundwater is recharged from river with 87%.

关键词： Stable Isotopes Groundwater Surface Water River Water Precipitation Recharge