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Ensemble machine learning models based on Reduced Error Pruning Tree for prediction of rainfall-induced landslides

International Journal of Digital Earth 2021年第5期14卷 575-596页

作者： Binh Thai Pham Abolfazl Jaafari trung Nguyen-Thoi tran Van Phong Huu Duy Nguyen Neelima Satyam Md Masroor Sufia Rehman Haroon Sajjad Mehebub Sahana Hiep Van Le Indra Prakash Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Research Institute of Forests and Rangelands Agricultural ResearchEducationand Extension Organization(AREEO)TehranIran Institute of Geological Sciences Vietnam Academy of Sciences and TechnologyHanoiViet Nam Faculty of Geography V.N.U.University of ScienceVietnam National UniversityHanoiViet Nam Discipline of Civil Engineering Indian Institute of Technology IndoreMadhya PradheshIndia Department of Geography Jamia Millia IslamiaNew DelhiIndia School of Environment Education and DevelopmentUniversity of ManchesterManchesterUK Institute of Research and Development Duy Tan UniversityDa NangViet Nam DDG(R)Geological Survey of India GujaratIndia

In this paper,we developed highly accurate ensemble machine learning models integrating Reduced Error Pruning Tree(REPT)as a base classifier with the Bagging(B),Decorate(D),and Random Subspace(RSS)ensemble learning techniques for spatial prediction of rainfallinduced landslides in the Uttarkashi district,located in the Himalayan range,*** do so,a total of 103 historical landslide events were linked to twelve conditioning factors for generating training and validation *** Mean Square Error(RMSE)and Area Under the receiver operating characteristic Curve(AUC)were used to evaluate the training and validation performances of the *** results showed that the single REPT model and its derived ensembles provided a satisfactory accuracy for the prediction of *** D-REPT model with RMSE=0.351 and AUC=0.907 was identified as the most accurate model,followed by RSS-REPT(RMSE=0.353 and AUC=0.898),B-REPT(RMSE=0.396 and AUC=0.876),and the single REPT model(RMSE=0.398 and AUC=0.836),*** prominent ensemble models proposed and verified in this study provide engineers and modelers with insights for development of more advanced predictive models for different landslide-susceptible areas around the world.

关键词： Machine learning ensemble modeling Bagging Decorate Random Subspace

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In vivo anticancer activity of maesopsin 4—O— β—glucoside isolated from leaves of Artocarpus tonkinensis *** Gagnep

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Asian Pacific Journal of Tropical Medicine 2016年第4期9卷 343-348页

作者： Trinh Thi Thuy Dao Duc Thien tran quang Hung Nguyen Thanh Tam Nguyen Thi Hoang Anh Nguyen Thi Nga Nguyen Thi Cuc Le Phuong Mai tran Van Sung Domenico V.Delfino Do Thi Thao Institute of Chemistry.Vietnam Academy of Science and Technology Institute of Biotechnology Vietnam Academy of Science and Technology National Research Council Canada Measurement Science and Standards1200 Montreal RoadBuilding M-12.Ottatca.Ontario KIA OR6 Department of Medicine University of PerugiaPiazzale Gambuli.S.Andrea delle Fratte

Objective:To investigate the antitumor effect of maesopsin 4-O-β-glucoside(TAT2) isolated from the leaves of Artocarpus tonkinensis(***) *** ***:The antitumor activity of TAT2 was evaluated in Lewis lung carcinoma(LLC) tumor-bearing ***/c mice had tumors induced by implantation with 2× 10~6 LLC cells into the subcutaneous right posterior ***-bearing mice were treated orally with a range of doses of TAT2 and a standard drug,*** were observed for tumor growth and mortality *** was collected to determine hematological and biochemical *** TAT2 was isolated from an ethanolic extract of *** *** structure was determined by MS and NMR spectroscopy,and identified as *** compound did not show acute toxicity at the highest dose tested(2 OIK) mg/kg body weight).TAT2 exhibited antitumor activity by decreasing tumor growth,increasing the survival rale,and ameliorating some hematological and biochemical parameters at doses of 100 and 200 mg/kg body weight(P<0.05).Conclusions:These results indicate that TAT2 possesses clear antitumor *** to its bioavailability and low toxicity,and the fact that it could be isolated in a large scale from *** leaves,the compound shows promise as a potential anticancer drug.

关键词： Artocarpus tonkinensis BALB/c Hematological parameters Lewis lung carcinoma Maesopsin 4-0-β-glucoside

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Potential Application of iRap for Road Safety Assessment under Mixed Traffic Condition Case Study: Le Van Viet Street in Ho Chi Minh City

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Journal of Traffic and transportation Engineering 2023年第2期11卷 45-53页

作者： Vuong tran quang Faculty of Civil Engineering Campus in Ho Chi Minh CityUniversity of Transport and CommunicationsHo Chi Minh 700000Vietnam

Road transport safety policies have emphasized road infrastructure safety design and engineering as a core ***,in developing countries like Vietnam,this approach has been slower to adopt,resulting in substandard ***-depth studies of accident locations indicate that road environment factors contribute significantly to road accidents in Vietnam and road design features are associated with specific accident types and *** and reactive approaches,such as road safety audit,inspection,assessment,and treatment of hazardous locations,are necessary to ensure that the road and its environment are *** paper provides an overview of road safety in Vietnam in general,and Ho Chi Minh in particular,including its factors and characteristics,as well as road infrastructure safety *** iRap tool for road safety inspection and assessment is highlighted as a potential method for systematically analyzing road infrastructure deficiencies and providing targeted countermeasures to improve road safety under mixed traffic conditions.

关键词： Traffic safety road safety assessment mixed traffic condition

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Road Traffic Accident Patterns and Safety Policies Suggestions in Ho Chi Minh City

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Journal of Traffic and transportation Engineering 2022年第2期10卷 41-48页

作者： Vuong tran quang Faculty of Civil Engineering Campus in Ho Chi Minh CityUniversity of Transport and CommunicationsHo Chi MinhVietnam

Although the number of road traffic accidents,fatalities,injuries has been slightly reduced in recent years,HCMC(Ho Chi Minh City)would still face challenges in reducing and restraining road traffic accidents in the *** paper presents the results of road traffic accident data analysis over the past 3 years that we collected from the Road-Railway Police Bureau in *** on the results,we could be able to deeply understand trends,characteristics,and causes of road traffic *** a deep understanding is a scientific basis to study and formulate synchronous strategy along with specific solutions to solve road traffic accident problems more effectively in the future.

关键词： Traffic safety safety policies accident patterns.

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A Multiplicative Seasonal ARIMA/GARCH Model in EVN Traffic Prediction

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International Journal of Communications, Network and System Sciences 2015年第4期8卷 43-49页

作者： quang Thanh tran Zhihua Ma Hengchao Li Li Hao quang Khai Trinh Sichuan Provincial Key Laboratory of Information Coding and transmission Southwest Jiaotong University Chengdu China Beijing Branch of China United Network Communications Co. Ltd. Beijing China Telecommunication Department University of Transport and Communications Hanoi Vietnam

This paper highlights the statistical procedure used in developing models that have the ability of capturing and forecasting the traffic of mobile communication network operating in Vietnam. To build such models, we follow Box-Jenkins method to construct a multiplicative seasonal ARIMA model to represent the mean component using the past values of traffic, then incorporate a GARCH model to represent its volatility. The traffic is collected from EVN Telecom mobile communication network. Diagnostic tests and examination of forecast accuracy measures indicate that the multiplicative seasonal ARIMA/GARCH model, i.e. ARIMA (1, 0, 1) × (0, 1, 1)24/GARCH (1, 1) shows a good estimation when dealing with volatility clustering in the data series. This model can be considered to be a flexible model to capture well the characteristics of EVN traffic series and give reasonable forecasting results. Moreover, in such situations that the volatility is not necessary to be taken into account, i.e. short-term prediction, the multiplicative seasonal ARIMA/GARCH model still acts well with the GARCH parameters adjusted to GARCH (0, 0).

关键词： Traffic Prediction ARIMA GARCH Multiplicative Seasonal ARIMA/GARCH EViews

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越中贸易发展

越中贸易发展

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作者： tran trung DUNG（陈忠勇）浙江工业大学

学位级别：硕士

自从1991年越中两国开始恢复正常关系之后,两国的双边贸易已有初步的发展。在1999年,越中两国的高级领导已共同签署了“联合名声”,提出16字方针“睦邻友好,全面合作,长期稳定,面向未来”作为双边发展关系走向21世纪的主导方向之后,两... 详细信息

自从1991年越中两国开始恢复正常关系之后,两国的双边贸易已有初步的发展。在1999年,越中两国的高级领导已共同签署了“联合名声”,提出16字方针“睦邻友好,全面合作,长期稳定,面向未来”作为双边发展关系走向21世纪的主导方向之后,两国在文教、经济、科技、政治等各个领域的交往与合作不断发展,越中友好关系越来越巩固及加强,双边贸易也不断地提高和发展。近几年来,越中两国的双方贸易猛烈地增长。如今中国已成为越南最大的进口市场。本文主要分成果如下:第一,现状大部分学者都关注越中两国的边境贸易来分析越中两国的贸易关系。而本文从双边贸易非边境贸易的角度来分析两国的贸易情况,将对越中贸易的成体情况进行深入分析。第二,本文在前人的研究基础上融入了越中贸易发展及越南经济增长的新特点新趋势。同时在越中两国的贸易发展过程中提出了两国存在的问题。并且运用SWOT模型来进行分析越中两国的贸易关系,同时指出越中贸易的优势、劣势、机会和威胁。第三,目前学术界对越中贸易问题的研究主要集中在越中边境贸易发展的现状,大部分的研究都是对越中贸易进行表面的分析。本文对越中贸易和越南经济发展之间的关系进行深入的定性分析的基础上,通过实证分析,进一步深入挖掘越中贸易与越南经济发展的联系。通过本论文我们已指出越中两国在贸易发展处所存在的问题,并提出了一些方案来减少越南对中国的贸易逆差,同时对越南方面提出一些建议来进一步促进越中两国的贸易长远发展、不断地增长。

关键词：越中贸易越中关系发展战略逆差顺差

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Adaptability Zoning for Salty-Tolerant Rice Varieties in Soc trang Prefecture by Using GIS and Remote Sensing

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Journal of Geological Resource and Engineering 2016年第3期4卷 142-150页

作者： tran Thanh Dan tran Thi Ngoc Trinh Vo quang Minh Huynh Ngoc Van Department of Land Resources College of the Environment and Natural Resources Can Tho University Viet Nam Department of Science and Technology Graduate School of Engineering Nagasaki University Japan Center of Seed and Plant Soc trang province Viet Nam

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Control Rod Calibration and Worth Calculation for Optimized Power Reactor 1000 (OPR-1000) Using Core Simulator OPR1000

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World Journal of Nuclear Science and Technology 2017年第1期7卷 15-23页

作者： Nguyen An Son Nguyen Duc Hoa tran trung Nguyen tran Quoc Tuan Osvaldo Camueje Raul Dalat University Da Lat Vietnam Agostinho Neto University Luanda Angola

Control rod is used to change the power in nuclear reactor.?Certainly, the core at any moment can be made subcritical condition and shut downs when occurring?to emergency instance in the core. The rod is grouped based?on their function and located at different places in the core where their feature is maximized.?Two methods of control rod calibration are the asymptotic period method and the rod-drop method, which were applied in this experiment. In the first method, the reactor is made supcritical by inserting the control rod to be calibrated a certain level. The rod drop method is to determine the subcritical;at the critical state, the rod to be calibrated is dropped into the core, and the resulting decay of neutron flux is observed and related to the reactivity. In this paper, the regulating rod will be calibrated according to the reactivity in OPR-1000 that corresponds to a certain control rod insert or withdraw, and the reactivity in power reactor depends?on the integral and differential control rod group too. The core simulator OPR1000 is used to test those methods.

关键词： Control Rod The Asymptotic Period Method The Rod-Drop Method Core Simulator OPR1000

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创业团队冲突对团队双元创新导向的影响——基于团队行为整合的中介作用和团队创新氛围的调节作用

创业团队冲突对团队双元创新导向的影响——基于团队行为整合的中...

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作者： tran quang VU（陈光武）厦门大学

学位级别：硕士

在管理和组织研究领域中,团队冲突是指团队成员由于目标、价值理念、情感和利益等方面的分歧或对立所引发的一个过程。现代的团队冲突理论已经证实不同的冲突类型对团队绩效有不同的影响。其中任务冲突对团队创新的影响至今还存在争议... 详细信息

在管理和组织研究领域中,团队冲突是指团队成员由于目标、价值理念、情感和利益等方面的分歧或对立所引发的一个过程。现代的团队冲突理论已经证实不同的冲突类型对团队绩效有不同的影响。其中任务冲突对团队创新的影响至今还存在争议。本研究对创业团队冲突进行探讨,并通过实证研究结果证明任务冲突对团队双元创新导向有显著促进作用。目前对创业团队冲突的研究主要集中于团队冲突对团队双元创新导向的直接影响上,忽视了对团队冲突与团队绩效之间的中介变量进行深入探讨。本研究在社会信息加工理论的基础上提出了创业团队行为整合对团队冲突与团队双元创新导向关系的中介作用假设,采用问卷调查的方式收集数据,并运用统计方法对假设进行了实证检验。本研究一方面在一定程度上丰富了团队冲突对于团队创新影响的研究;另一方面也对创业团队在创业过程中提供了一些有参考价值的意见。本研究的主要结果是:创业团队任务冲突对双元创新导向有显著正向影响,创业团队关系冲突对双元创新导向有显著负向影响,创业团队行为整合对双元创新导向有显著正向影响,创业团队的合作行为、信息交换和联合决策在关系冲突对团队双元创新导向的影响中起显著完全的中介作用,团队创新氛围显著增强了任务冲突对双元创新导向的正向影响,团队规模与团队成立时间对双元创新导向均有显著正向影响。

关键词：团队冲突创业团队双元创新行为整合

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Novel Active Contour Model for Image Segmentation Based on Local Fuzzy Gaussian Distribution Fitting

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Journal of Electronic Science and Technology 2012年第2期10卷 113-118页

作者： quang Tung Thieu Marie Luong Jean-Marie Rocchisani Nguyen Linh-trung Emmanuel Viennet the L2TI laboratory Université Paris 13 Sorbonne Paris CitéF-93430 Villetaneuse France the Avicenne University Hospital the Faculty of Electronics and Telecommunications University of Engineering and Technology Vietnam National University

A novel active contour model is proposed, which incorporates local information distributions in a fuzzy energy function to effectively deal with the intensity inhomogeneity. Moreover, the proposed model is convex with respect to the variable which is used for extracting the contour. This makes the model independent on the initial condition and suitable for an automatic segmentation. Furthermore, the energy function is minimized in a computationally efficient way by calculating the fuzzy energy alterations directly. Experiments are carried out to prove the performance of the proposed model over some existing methods. The obtained results confirm the efficiency of the method.

关键词： Active contour energy minimization fuzzy energy function local information medical image segmentation.

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