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NBP-based localization algorithm for wireless sensor networks in NLOS environments

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Journal of Southeast University(English Edition) 2016年第4期32卷 395-401页

作者： bui thi oanh 徐平平朱文祥武贵路东南大学移动通信国家重点实验室南京210096

To mitigate the impacts of non-line-of-sight（NLOS） errors on location accuracy, a non-parametric belief propagation（NBP）-based localization algorithm in the NLOS environment for wireless sensor networks is *** to the amount of prior information known about the probabilities and distribution parameters of the NLOS error distribution, three different cases of the maximum a posterior（MAP） localization problems are introduced. The first case is the idealized case, i. e., the range measurements in the NLOS conditions and the corresponding distribution parameters of the NLOS errors are known. The probability of a communication of a pair of nodes in the NLOS conditions and the corresponding distribution parameters of the NLOS errors are known in the second case. The third case is the worst case, in which only knowledge about noise measurement power is obtained. The proposed algorithm is compared with the maximum likelihood-simulated annealing（ML-SA）-based localization algorithm. Simulation results demonstrate that the proposed algorithm provides good location accuracy and considerably outperforms the ML-SA-based localization algorithm for every case. The root mean square error（RMSE）of the location estimate of the NBP-based localization algorithm is reduced by about 1. 6 m in Case 1, 1. 8 m in Case 2 and 2. 3 m in Case 3 compared with the ML-SA-based localization algorithm. Therefore, in the NLOS environments,the localization algorithms can obtain the location estimates with high accuracy by using the NBP method.

关键词： non-line-of-sight(NLOS) localization accuracy wireless sensor networks

Exponentially Bounded C-semigroup and the Cauchy Initial Value Problems in Complete Random Normed Modules

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2195-2212页

作者： Son TA CONG Thang Dang HUNG oanh Le thi Department of Mathematics University of ScienceVietnam National University 334 Nguyen TraiThanh XuanHanoiVietnam Faculty of Natural Sciences Hong Duc University565 Quang TrungDong VeThanh HoaVietnam

In this paper,the notion of C-semigroup of continuous module homomorphisms on a complete random normal(RN)module is introduced and *** existence and uniqueness of solution to the Cauchy problem with respect to exponen... 详细信息

关键词： C-semigroup Cauchy problem random normed modules L^(0)-Lipschitz

Photocatalytic degradation of antibiotic sulfamethizole by visible light activated perovskite LaZnO_(3)

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Journal of Environmental Sciences 2024年第10期144卷 212-224页

作者： bui The Huy XCuong Nguyen Vu Khac Hoang bui Nguyen Ngoc Tri Iqra Rabani Nhu Hoa thi Tran Quang Viet Ly Hai Bang Truong Major of Biomedical Engineering Division of Smart HealthcareCollege of Information Technology and ConvergencePukyong National UniversityBusan 48513Korea Center for Advanced Chemistry Institute of Research and DevelopmentDuy Tan UniversityDa Nang 550000Viet Nam Faculty of Environmental and Chemical Engineering Duy Tan UniversityDa Nang 550000Viet Nam Department of Environment and Energy Sejong UniversitySeoul 05006Korea Lab of Computational Chemistry and Modelling Department of ChemistryFaculty of Natural SciencesQuy Nhon UniversityQuy NhonViet Nam Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Korea Faculty of Materials Science and Technology University of ScienceHo Chi Minh City 700000Viet Nam Vietnam National University Ho Chi Minh City 700000Viet Nam Department of Environmental Engineering Seoul National University of Science and TechnologySeoul 01811Korea Optical Materials Research Group Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Applied Technology School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam

In thiswork,the perovskite LaZnO_(3) was synthesized via sol-gel method and applied for photocatalytic treatment of sulfamethizole(SMZ)antibiotics under visible light *** was almost completely degraded(99.2%±0.3%)within 4 hr by photocatalyst LaZnO3 at the optimal dosage of 1.1 g/L,with amineralization proportion of 58.7%±0.4%.The efficient performance of LaZnO_(3) can be attributed to itswide-range light absorption and the appropriate energy band edge levels,which facilitate the formation of active agents such as·O_(2)^(−),h^(+),and·*** integration of RP-HPLC/Q-TOF-MS and DFT-based computational techniques revealed three degradation pathways of SMZ,which were initiated by the deamination reaction at the aniline ring,the breakdown of the sulfonamidemoieties,and a process known as Smile-type rearrangement and SO2 *** toxicity of SMZ and the intermediateswere analyzed by quantitative structure activity relationship(QSAR),indicating the effectiveness of LaZnO_(3)-based photocatalysis in preventing secondary pollution of the intermediates to the ecosystem during the degradation *** visible-light-activated photocatalyst LaZnO_(3) exhibited efficient performance in the occurrence of inorganic anions and maintained high durability across multiple recycling tests,making it a promising candidate for practical antibiotic treatment.

关键词： Perovskite Antibiotics Photocatalysis Density functional theory Toxicity

Energy-efficient cell-association bias adjustment algorithm for ultra-dense networks

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Science China(Information Sciences) 2018年第2期61卷 100-114页

作者： Wenxiang ZHU Pingping XU thi oanh bui Guilu WU Yan YANG National Mobile Communications Research Laboratory Southeast University Department of Electronic and Electrical Engineering Bengbu University

In recent years, energy efficiency has become an important topic, especially in the field of ultradense networks(UDNs). In this area, cell-association bias adjustment and small cell on/off are proposed to enhance the performance of energy efficiency in UDNs. this is done by changing the cell association relationship and turning off the extra small cells that have no users. However, the variety of cell association relationships and the switching on/off of the small cells may deteriorate some users’ data rates, leading to nonconformance to the users’ data rate requirement. Considering the discreteness and non-convexity of the energy efficiency optimization problem and the coupled relationship between cell association and scheduling during the optimization process, it is difficult to achieve an optimal cell-association bias. In this study, we optimize the network energy efficiency by adjusting the cell-association bias of small cells while satisfying the users’ data rate requirement. We propose an energy-efficient centralized Gibbs sampling based cell-association bias adjustment(CGSCA) algorithm. In CGSCA, global information such as channel state information, cell association information, and network load information need to be collected. Then, considering the overhead of the messages that are exchanged and the implementation complexity of CGSCA to obtain the global information in UDNs, we propose an energy-efficient distributed Gibbs sampling based cell-association bias adjustment(DGSCA) algorithm with a lower message-exchange overhead and implementation *** DGSCA, we derive the updated formulas for calculating the number of users in a cell and the users’ SINR. We analyze the implementation complexities(e.g., computation complexity and communication complexity) of the proposed two algorithms and other existing algorithms. We perform simulations, and the results show that CGSCA and DGSCA have faster convergence speed, as well as a higher performance gain o

关键词： ultra-dense networks cell-association bias energy efficiency Gibbs sampling users’ data rate constraint

Polycyclic aromatic hydrocarbons from rural household biomass burning in a typical Chinese village

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Science China Earth Sciences 2008年第7期51卷 1013-1020页

作者： NGUYEN thi Kim oanh Environmental Engineering SERD Asian Institute of Technology Pathumthani 12120 Thailand

Biomass energy sources are still popular in the rural areas of developing countries for cooking and space heating. Since the incomplete combustion of agricultural residues in home-made ranges might lead to both outdoo... 详细信息

关键词： biomass burning rural area household stoves PAHs emission factors distribution

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越南学习者汉语愉悦与人格特质的关系研究

红河学院学报 2024年第4期22卷 27-30页

作者：陈德忠朱氏莺中央民族大学国际教育学院北京100081 华东师范大学国际汉语文化学院上海200062

近年来,学习者的积极情绪成为了二语习得领域的研究热点。文章通过对107名越南学习者的汉语愉悦和人格特质的考察,探究汉语愉悦与人格特质的关系。结果显示:(1)学习者的总体汉语愉悦水平很高,个人汉语愉悦和汉语教师愉悦是主要的愉悦来... 详细信息

近年来,学习者的积极情绪成为了二语习得领域的研究热点。文章通过对107名越南学习者的汉语愉悦和人格特质的考察,探究汉语愉悦与人格特质的关系。结果显示:(1)学习者的总体汉语愉悦水平很高,个人汉语愉悦和汉语教师愉悦是主要的愉悦来源,汉语环境愉悦水平有待提高;(2)学习者的人格特质分布均衡,都具有开放性、尽责性、外向性、亲和性及神经质等五类人格特质;(3)除了神经质人格,其他四类人格特质都与汉语愉悦呈正相关,汉语愉悦水平的提高有助于人格特质的积极发展。文章基于研究结果分析了适合不同人格特质的汉语愉悦提升方式,可为个性化汉语二语教育提供一定的启示。

关键词：越南学习者汉语愉悦人格特质

Effect of heating time on structural,morphology,optical,and photocatalytic properties of g-C3N4 nanosheets

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Chinese Physics B 2020年第5期29卷 504-508页

作者： Nguyen Manh Hung Le thi Mai oanh Lam thi Hang Pham Do Chung Pham thi Duyen Dao Viet Thang Nguyen Van Minh Center for Nano Science and Technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41A Phu Dien RoadNorth Tu LiemHanoi100000Vietnam Hanoi University of Mining and Geology Duc Thang wardNorth Tu Liem DistrictHanoi100000Vietnam Military science Academy 322 Le Trong Tan streetDinh CongHoang MaiHanoi100000Vietnam

Effect of heating time on the structural,morphology,optical,and photocatalytic properties of graphitic carbon nitride(g-C3N4)nanosheets prepared at 550℃in Ar atmosphere is *** investigations are carried out by using x-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),UV-vis absorption,and photoluminescence(PL).At a heating temperature of 550℃,g-C3N4 nanocrystals are formed after 0.5 h and become more orderly as the heating time *** surface area of the g-C3N4 nanosheets significantly increases as the preparation time *** g-C3N4 prepared in 2.5 h shows the highest photocatalytic performance,decomposing completely 10 ppm RhB solution under xenon lamp irradiation for 2.0 h.

关键词： nanosheets photocatalytic heating time Ar atmosphere

The observed analysis on the wave spectra of Hurricane Juan (2003)

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Acta Oceanologica Sinica 2014年第11期33卷 112-122页

作者： XU Fumin bui thi Thuy Duyen PERRIE Will Key Laboratory of Coastal Disaster and Defense Ministry of EducationCollege of HarbourCoastal and Offshore EngineeringHohai University Fisheries & Oceans Canada Bedford Institute of Oceanography

Hurricane Juan provides an excellent opportunity to probe into the detailed wave spectral patterns and spectral parameters of a hurricane system, with enough wave spectral observations around Juan＇s track in the deep ocean and shallow coastal water. In this study, Hurricane Juan and wave observation stations around Juan＇s track are introduced. Variations of wave composition are discussed and analyzed based on time series of one-dimensional frequency spectra, as well as wave steepness around Juan＇s track： before, during, and after Juan＇s passing. Wave spectral involvement is studied based on the observed one-dimensional spectra and two-dimensional spectra during the hurricane. The standardization method of the observed wave spectra during Hurricane Juan is discussed, and the standardized spectra show relatively conservative behavior, in spite of the huge variation in wave spectral energy, spectral peak, and peak frequency during this hurricane. Spectral widths＇ variation during Hurricane Juan are calculated and analyzed. A two-layer nesting WW3 model simulation is applied to simulate the one-dimensional and two-dimensional wave spectra, in order to examine WW3＇s ability in simulating detailed wave structure during Hurricane Juan.

关键词： Hurricane Juan wave spectra wave steepness spectral width WW3

The cross-section for the γe-→Ze-→l-l+e- scattering at the LHeC

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Chinese Physics C 2023年第2期47卷 82-87页

作者： bui thi Ha Giang Hanoi National University of Education 136 Xuan ThuyHanoiVietnam

A measurement of the Z production cross-section in γe^(-) collisions at the Large Hadron^(-)electron Collider(LHeC) is presented for comparison to that at the International Linear Collider(ILC).The total cross-section depends strongly on the polarization of the initial and final e^(-)beams and the electron beam energy Ee;the energy of the proton beam was set to E_(p)=7 *** results show that the total cross^(-)section in γe^(-)→Ze^(-)→l^(-)l+e^(-) at the LHeC is much larger than that at the ILC.

关键词： Z production cross-section LHeC