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Influence of phytochemicals in piper betle linn leaf extract on wound healing

Burns & Trauma 2015年第3期3卷 143-150页

作者： Le Thi Lien Nguyen Thi Tho Do Minh Ha pham luong hang Phan Tuan Nghia Nguyen Dinh Thang Department of Biochemistry and Plant Physiology VNU University of ScienceVietnam National University334 Nguyen Trai St.Thanh Xuan DistrictHanoiVietnam Key laboratory of Enzyme and Protein Technology(KLEPT) VNU University of ScienceVietnam National UniversityHanoiVietnam

Background:Wound healing has being extensively investigated over the *** impairment is caused by many reasons including increasing of free-radicals-mediated damage,delaying in granulation tissue formation,reducing in angiogenesis and decreasing in collagen *** facts consequently lead to chronic wound *** betle Linn(Betle)leaves have been folklore used as an ingredient of drugs for cutaneous wound ***,the effect of betle leaf on wound healing is not yet well *** this study,we aimed to investigate the healing efficacy of methanol leaf extract of Piper betle Linn on proliferation of fibroblast NIH3T3 cells as well as full-thickness burn and excision wounds in swiss ***:Scratch wound healing assays were conducted to examine the effects of betle leaf extract on healing activity of fibroblast *** and excision wounds on swiss mouse skins were created for investigating the wound healing progress caused by the betle leaf ***(MDA)was also evaluated to examine the products of lipid hydroperoxide(LPO)under conditions of with or without betle leaf extract ***:The results of this study showed that Piper betle Linn leaf extract in methanol increased proliferation of NIH3T3 cells and promoted wound healing in vitro and in vivo with both burn wound and excision wound *** addition,this extract significant decreased level of malondialdehyde(MDA)in liver of treated-mice compared with that in non-treated ***:Our results suggest that Piper betle Linn can be used as an ingredient in developing natural origin drugs for treatment of cutaneous wounds.

关键词： Piper betle Linn Leaf extract Wound healing Malondialdehyde(MDA) Fibroblast(NIH3T3)

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STRONG CONVERGENCE OF AN INERTIAL EXTRAGRADIENT METHOD WITH AN ADAPTIVE NONDECREASING STEP SIZE FOR SOLVING VARIATIONAL INEQUALITIES

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Acta Mathematica Scientia 2022年第2期42卷 795-812页

作者： Nguyen Xuan LINH Duong Viet THONG Prasit CHOLAMJIAK pham Anh TUAN luong Van LONG Department of Mathematics Mathematics Falcuty of Information TechnologyNational University of Civil Engineering Division of Applied Mathematics Thu Dau Mot UniversityBinh Duong ProvinceVietnam School of Science University of PhayaoPhayao 56000Thailand Paculty of Mathematical Economics National Economics UniversityHanoi CityVietnam

In this work,we investigate a classical pseudomonotone and Lipschitz continuous variational inequality in the setting of Hilbert space,and present a projection-type approximation method for solving this *** method requires only to compute one projection onto the feasible set per iteration and without any linesearch procedure or additional projections as well as does not need to the prior knowledge of the Lipschitz constant and the sequentially weakly continuity of the variational inequality mapping.A strong convergence is established for the proposed method to a solution of a variational inequality problem under certain mild ***,we give some numerical experiments illustrating the performance of the proposed method for variational inequality problems.

关键词： Inertial method Tseng’s extragradient viscosity method variational inequality problem pseudomonotone mapping strong convergence

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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

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Hybrid model to optimize object-based land cover classification by meta-heuristic algorithm:an example for supporting urban management in Ha Noi,Viet Nam

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International Journal of Digital Earth 2019年第10期12卷 1118-1132页

作者： Quang-Thanh Bui Manh pham Van Nguyen Thi Thuy hang Quoc-Huy Nguyen Nguyen Xuan Linh pham Minh Hai Tran Anh Tuan pham Van Cu Center for Applied Research in Remote sensing and GIS(CARGIS) VNU University of ScienceHa NoiViet Nam VNU University of Science Ha NoiViet Nam Vietnam Institute of Geodesy and Cartography Ha NoiViet Nam Ministry of Education and Training Ha NoiViet Nam

This study proposed a novel object-based hybrid classification model named GMNN that combines Grasshopper Optimization Algorithm(GOA)and the multiple-class Neural network(MNN)for urban pattern detection in Hanoi,*** bands of SPOT 7 image and derivable NDVI,NDWI were used to generate image segments with associated attributes by PCI Geomatics *** segments were classified into four urban surface types(namely water,impervious surface,vegetation and bare soil)by the proposed ***,three training and validation datasets of different sizes were used to verify the robustness of this *** all tests,the overall accuracies of the classification were approximately 87%,and the Area under Receiver Operating Characteristic curves for each land cover type was ***,the performance of this model was examined by comparing several statistical indicators with common benchmark *** results showed that GMNN out-performed established methods in all comparable *** results suggested that our hybrid model was successfully deployed in the study area and could be used as an alternative classification method for urban land cover *** a broader sense,classification methods will be enriched with the active and fast-growing contribution of metaheuristic algorithms.

关键词： Urban remote sensing object-based classification neural network grasshopper optimization algorithm

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Skin fold thickness at abdomen:a simple anthropometric measurement may compliment metabolic syndrome definition in patients with normal waist circumference

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Journal of Geriatric Cardiology 2006年第2期3卷 85-92页

作者： Toan C Nguyen Thai Q Ngo Son V Nguyen Hieu T luong Khoa TA pham Cong D Nguyen Vietnam Military Medical University Ha ToyVietnam

Backgroud and Objectives Previous studies have reported that skin fold thickness (SF) strongly correlated with insulin resistance in the metabolic syndrome (MetS). In this study, we developed a MetS definition by SF at A8 point (SFA8) on Erdheim diagram(MetSSFA8) in essential hypertensive patients. Subjects and Methods Medical records of 268 essential hypertensive patients (126males and 122 females) were analyzed, including 210 non-diabetic patients (NDM group) and 58 patients with diabetes (DM group).The mean age was 61.4 ± 9.9 and 59.0 ± 11.0 years, respectively. The control group consisted of 90 non-diabetic, non-hypertensive patients with a mean age of 58.0 ± 11.3 years. The proposed MetSSFA8 definition included SFA8 specific values ( ≥30 mm in female and ≥27 mm in male) and at least two of the following: raised triglyceride levels ( ≥1.7 mmol/L), or specific treatment for this lipid abnormality; raised blood pressure (SBP≥130 mmHg and/or DBP≥85 mmHg), or treatment of previously diagnosed hypertension;reduced HDL-cholesterol (＜ 1.03 mmol/L in men, ＜1.29 mmol/L in women), or specific treatment for this lipid abnormality; raised fasting plasma glucose (≥5.6 mmol/l), or previously diagnosed DM. Metabolic Syndrome by the National Cholesterol Education Program and International Diabetes Federation definitions were determined with abdominal obesity defined by Asia-Pacific criteria for waist circumference (NCEPA and IDFA). Results The percentage of MetS as defined by NCEPA, IDFA and MetSSFA8 in NDM group was lower than that of NCEPA, IDFA and MetSSFA8 in DM group [OR=7.7 (95%CI, 2.9-20.2) and 2.5 (95%CI, 1.4-4.8) and 2.7(95%CI, 1.3-5.6), respectively] and higher than that of the control group [OR=53.3 (95%CI, 16.7-170.6), 5.8 (95%CI, 2.6-13.2) and18.8 (95%CI, 7.3-48.7), respectively]. The percentage of MetS by NCEPA, IDFA and MetSSFA8 in males in NDM group was lower than the percentage of MetS by NCEPA, IDFA and MetSSFA8 in females in NDM group (50.8% and 77.9%, P＜ 0.0

关键词： skin fold thickness metabolic syndrome hypertension

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A new formula for screening metabolic syndrome in Asians:skin fold thickness at A8 point on Erdheim diagram and waist circumference

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Journal of Geriatric Cardiology 2007年第1期4卷 32-41页

作者： Toan C Nguyen Thai Q Ngo Khoa TA pham Son V Nguyen Hieu T luong Cong D Nguyen Vietnam Military Medical University Ha Dong Town Ha Tay Province Vietnam Department of Cardiology Hospital 103 Vietnam

Background and objectives Recent studies have shown that abdominal obesity is an important component for the diagnosis of metabolic syndrome (MS) and MS is a high risk factor for cardiovascular disease and diabetes mellitus. The aim of this study was to develop a new formula for screening and diagnosis of MS using the waist circumference (WC) and skin fold thickness at the point A8 (SFA8) on the Erdheim diagram. Methods A total of 358 essential hypertensive patients (189 male and 169 female) with a mean age of 59.0±9.7 years were included; 151 healthy people (79 male, 72 female) with a mean age of 57.3±12.1 years (similar to hypertensive patients) who were non-hypertensive and non-diabetic served as a control group. All subjects had no evidence of hepatic, renal, or endocrine disease as determined by history, physical examination and screening blood tests. Height, weight, WC, SFA8, blood pressure (BP), fasting plasma glucose, HDL-cholesterol and triglyceride levels were measured in all subjects. Abdominal obesity measured by WC using the Asia-Pacific criteria (IDFA) was applied for meeting the MS definition. The normal value of SFA8 was measured in the non- MS group. Relationships between SFA8 and systolic BP, diastolic BP, fasting plasma glucose, HDL-cholesterol and triglyceride levels were calculated in the control group. A new formula was developed according to high SFA8 and high WC. Results The normal value of SFA8 in non-MS group was 23.6±7.2 mm in male and 26.5±4.6 mm in female, respectively. The value of SFA8 in MS group was 36.7± 7.4 mm in male and 38.9 ± 8.1 mm in female, respectively. The value of WC in MS group and non-MS group were 92.5±3.0 cm and 79.4±6. 1 cm in male and 86.3±6.4 cm and 74.7±5.4 cm in female, respectively. There was a correlation between SFA8 and systolic BP, diastolic BP, fasting plasma glucose, HDL-cholesterol and triglyceride in control group (the correlation coefficients were 0.29, 0.23, 0.25, -0.31 and 0.46, respectively, P < 0.01)

关键词： waist circumference skin fold thickness metabolic syndrome

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Improved flood susceptibility mapping using a best first decision tree integrated with ensemble learning techniques

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Geoscience Frontiers 2021年第3期12卷 333-342页

作者： Binh Thai pham Abolfazl Jaafari Tran Van Phong Hoang Phan Hai Yen Tran Thi Tuyen Vu Van luong Huu Duy Nguyen Hiep Van Le Loke Kok Foong University of Transport Technology Ha Noi 100000Viet Nam Research Institute of Forests and Rangelands Agricultural ResearchEducation and Extension Organization(AREEO)TehranIran Institute of Geological Sciences Vietnam Academy of Sciences and Technology84 Chua Lang StreetDong daHa NoiViet Nam Department of Geography School of Social EducationVinh UniversityViet Nam Department of Resource and Environment Management School of Agriculture and ResourcesVinh UniversityViet Nam Faculty of Geography VNU University of Science334 Nguyen TraiHa NoiViet Nam Institute of Research and Development Duy Tan UniversityDa Nang 550000Viet Nam Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

Improving the accuracy of flood prediction and mapping is crucial for reducing damage resulting from flood *** this study,we proposed and validated three ensemble models based on the Best First Decision Tree(BFT)and the Bagging(Bagging-BFT),Decorate(Bagging-BFT),and Random Subspace(RSS-BFT)ensemble learning techniques for an improved prediction of flood susceptibility in a spatially-explicit manner.A total number of 126 historical flood events from the Nghe An Province(Vietnam)were connected to a set of 10 flood influencing factors(slope,elevation,aspect,curvature,river density,distance from rivers,flow direction,geology,soil,and land use)for generating the training and validation *** models were validated via several performance metrics that demonstrated the capability of all three ensemble models in elucidating the underlying pattern of flood occurrences within the research area and predicting the probability of future flood *** on the Area Under the receiver operating characteristic Curve(AUC),the ensemble Decorate-BFT model that achieved an AUC value of 0.989 was identified as the superior model over the RSS-BFT(AUC=0.982)and Bagging-BFT(AUC=0.967)models.A comparison between the performance of the models and the models previously reported in the literature confirmed that our ensemble models provided a reliable estimate of flood susceptibilities and their resulting susceptibility maps are trustful for flood early warning systems as well as development of mitigation plans.

关键词： Machine learning Ensemble learners Hybrid modeling

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A Data Collection on Secondary School Students’STEM Performance and Reading Practices in an Emerging Country

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Data Intelligence 2021年第2期3卷 336-356页

作者： Quan-Hoang Vuong Viet-Phuong La Manh-Toan Ho Thanh-hang pham Thu-Trang Vuong Ha-My Vuong Minh-Hoang Nguyen Centre for Interdisciplinary Social Research Phenikaa UniversityYen Nghia WardHa Dong DistrictHanoi 100803Vietnam A.I.for Social Data Lab Vuong&AssociatesDong Da DistrictHanoi 100000Vietnam School of Business and Management RMIT Vietnam UniversityHanoi 100000Vietnam

Science,technology,engineering,and mathematics(STEM)education has become a critical factor in promoting sustainable ***,book reading is still an essential method for cognitive development and knowledge *** developing countries where STEM teaching and learning resources are limited,book reading is an important educational tool to promote ***,public data sets about STEM education and book reading behaviors in emerging countries are *** article,therefore,aims to present a data set of 4,966 secondary school students from a school-based data collection in *** data set comprises of five major categories:1)students’personal information(including STEM performance),2)family-related information,3)book reading preferences,4)book reading frequency/habits,and 5)classroom *** introducing the designing principles,the data collection method,and the variables in the data set,we aim to provide researchers,policymakers,and educators with well-validated resources and guidelines to conduct low-cost research,pedagogical programs in emerging countries.

关键词： STEM education Socio-economic status Book reading Emerging country Students

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Infectious keratitis in Vietnam:etiology,organisms,and management at Vietnam National Eye Hospital

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International Journal of Ophthalmology(English edition) 2022年第1期15卷 128-134页

作者： pham Ngoc Dong Do Thi Thuy hang Nguyen Thi Nga Duong Mai Thi Lien Angela C.Chen Anthony J.Aldave Vietnam National Eye Hospital Hanoi 10000Vietnam Nam Dinh Eye Hospital Nam Dinh 420000Vietnam Stein Eye Institute UCLA David Geffen School of MedicineLos AngelesCA 90095USA

AIM:To report the etiologies,risk factors,treatments,and outcomes of infectious keratitis(IK)at a major Vietnamese eye ***:This is a retrospective review of all cases of IK at Vietnam National Eye Hospital(VNEH)in Hanoi,*** histories,demographics,clinical features,microbiological results,and treatment outcomes were ***:IK was diagnosed in 1974 eyes of 1952 patients,with ocular trauma being the greatest risk factor for IK(34.2%),frequently resulting from an agriculturerelated injur y(53.3%).The mean duration between symptom onset and presentation to VNEH was 19.3±14.4 d,and 98.7%of patients had been treated with topical antibiotic and/or antifungal agents prior to evaluation at *** on smear results of 1706 samples,the most common organisms identified were bacteria(n=1107,64.9%)and fungi(n=1092,64.0%),with identification of both bacteria and fungi in 614(36.0%)***-five of 374 bacterial cultures(14.7%)and 426 of 838 fungal cultures(50.8%)were positive,with the most commonly cultured pathogens being Pseudomonas aeruginosa,Streptococcus pneumonia,Fusarium spp.,and Aspergillus *** perforation and descemetocele developed in 391(19.8%)and 93(4.7%)eyes,*** treatment was successful in resolving IK in 50.4%eyes,while 337(17.1%)eyes underwent penetrating or anterior lamellar *** was performed in 7.1%of eyes,most commonly in the setting of fungal ***:Ocular trauma is a major risk factor for IK in Vietnam,which is diagnosed in almost 400 patients each year at *** this,and as approximately one quarter of the eyes that develop IK require corneal transplantation or evisceration,greater emphasis should be placed on the development of prevention and treatment programs for IK in Vietnam.

关键词： infectious keratitis bacterial keratitis fungal keratitis microsporidial keratitis Acanthamoeba keratitis herpes simplex virus keratitis Vietnam

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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.

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