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Structural Characteristics of Allomyrina Dichotoma Beetle＇s Hind Wings for Flapping Wing Micro Air Vehicle

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Journal of Bionic Engineering 2014年第2期11卷 226-235页

作者： ngoc San Ha Quang Tri Truong Hoang Vu phan Nam Seo Goo Hoon Cheol Park Biomimetics and Intelligent Microsystem Laboratory Department of Advanced Technology Fusion Division of Interdisciplinary Studies Konkuk University Seoul 143-701 Republic of Korea

In this study, we present a complete structural analysis ofAllomyrina dichotoma beetle＇s hind wings by investigating their static and dynamic characteristics. The wing was subjected to the static loading to determine its overall flexural stiffness. Dy- namic characteristics such as natural frequency, mode shape, and damping ratio of vibration modes in the operating frequency range were determined using a Bruel ＆ Kjaer fast Fourier transform analyzer along with a laser sensor. The static and dynamic characteristics of natural Allomyrina dichotoma beetle＇s hind wings were compared to those of a fabricated artificial wing. The results indicate that natural frequencies of the natural wing were significantly correlated to the wing surface area density that was defined as the wing mass divided by the hind wing surface area. Moreover, the bending behaviors of the natural wing and artificial wing were similar to that of a cantilever beam. Furthermore, the flexural stiffness of the artificial wing was a little higher than that of the natural one whereas the natural frequency of the natural wing was close to that of the artificial wing. These results provide important information for the biomimetic design of insect-scale artificial wings, with which highly ma- neuverable and efficient micro air vehicles can be designed.

关键词： beetle hind wing flexural stiffness natural frequency mode shape Micro Air Vehicles (MAVs)

Knowledge and attitude toward COVID-19 among healthcare workers at District 2 Hospital, Ho Chi Minh City

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Asian Pacific Journal of Tropical Medicine 2020年第6期13卷 260-265页

作者： Huynh giao Nguyen Thi ngoc Han Tran Van Khanh Vo Kim Ngan Vo Van Tam Pham Le An Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Department of Infectious Diseases University Medical Center Ho Chi Minh CityVietnam Department of Scientific Research District 2 HospitalHo Chi Minh CityVietnam Department of Nursing District 2 HospitalHo Chi Minh CityVietnam Faculty of Nursing and Medical Technology University of Medicine Pham Ngoc Thach at Ho Chi Minh CityVietnam Center for the Training of Family Medicine Faculty of MedicineUniversity of Medicine and Pharmacy at Ho Chi Minh CityVietnam

Objective:To assess the knowledge and attitude toward coronavirus disease-2019(COVID-19)among healthcare workers at District 2 Hospital in Ho Chi Minh City(HCMC).Methods:A cross-sectional study was performed between January 2020 and February 2020 at District 2 Hospital.A systematic random sampling strategy was carried out and the data was collected through a self-administered questionnaire of the knowledge and attitude of healthcare workers regarding *** analysis was reported to describe the demographic,mean knowledge and attitude score of healthcare *** statistics including t-test,ANOVA and Spearman’s correlation were used to evaluate the relationship between study ***:A total of 327 eligible healthcare workers had a mean score of knowledge and attitude of 8.17±1.3(range 4-10)and 1.86±0.43(range 1-5),*** showed good knowledge and a positive ***,approximately two thirds of the participants knew the mode of transmission,the isolation period and treatment(67.0%,65.8%,and 58.4%,respectively),and 82.3%and 79.8%,respectively,held positive attitude regarding the risk of personal and family members getting *** was a negative correlation between knowledge scores and attitude scores(r=-0.21,P<0.001).Additionally,healthcare workerspredominately used social media to inform themselves about COVID-19(91.1%).Conclusions:The majority of healthcare workers had good knowledge and positive attitude toward ***,the level of some knowledge and attitude lower than that expected for their position level towards the *** education interventions and campaigns are required for healthcare workers.

关键词： Knowledge Attitude COVID-19 Healthcare worker District 2 Hospital

Rapid and efficient characterization of cervical collagen orientation using linearly polarized colposcopic images

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Journal of Innovative Optical Health Sciences 2023年第5期16卷 21-31页

作者： Cat phan ngoc Khuong Dung Nguyen Huu Quang Hai Pham Thanh Long Nguyen Quynh Nguyen ngoc Duc Le Huynh Tien Tran Van Tu Ly Anh Department of Applied Physics Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City 700000Vietnam Quality Management Department Tu Du Hospital 284 Cong QuynhDistrict 1 Ho Chi Minh City 700000Vietnam Department of Biomedical Engineering Nguyen Tat Thanh University 300A Nguyen Tat Thanh District 4Ho Chi Minh City 700000Vietnam Faculty of Science and Technology Jean Monnet University 11 Rue du Docteur Annino Saint Etienne 42000France

Collagen provides tissue strength and structural *** fication of the orientated dispersion of collagen fibers is an important factor when studying the mechanical properties of the *** this study,for the first time,a new method for rapid characterization of the collagen fiber orientations of the cervix using linearly polarized light colposcopy is presented.A total of 24 colposcopic images were captured using a cross-polarized imaging system with white LED light *** the preprocessing stage,the Red channel of the RGB image was chosen,which contains no information of the blood vessels because of the low-absorption of blood cells in the red ***,which is an ImageJ plug-in,was used to estimate the local orientation of the collagen *** result shows that in the nonpregnant cervix,the middle zone(Zone 2)has circumferentially aligned collagen fibers while the inner zone(Zone 1)has randomly *** collagen fiber dispersion in Zone 2 is much smaller than that in Zone 1 at all four quadrants region(anterior,posterior,left,and right quadrant).This new analysis technique could potentially combine with diagnostic tools to provide a quantitative platform of collagen fibers in the clinic.

关键词： Cervix collagen fibers collagen orientation coherency cross-polarized imaging colposcopy

Orange G degradation by heterogeneous peroxymonosulfate activation based on magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid

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Journal of Environmental Sciences 2023年第2期124卷 379-396页

作者： Le Thi Thao To Van Nguyen Van Quy Nguyen ngoc Man phan Ki Jae Kim Nguyen Nhat Huy Nguyen Trung Dung Faculty of Physical and Chemical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Department of Energy Engineering Konkuk UniversitySeoul 05029Korea School of Chemical Engineering College of EngineeringSungkyunkwan UniversityJangan-guSuwon 16419Korea Faculty of Environment and Natural Resources Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City Linh Trung WardThu Duc CityHo Chi Minh City 700000Vietnam

Wastewater containing an azo dye Orange G(OG)causes massive environmental pollution,thus it is critical to develop a highly effective,environmental-friendly,and reusable catalyst in peroxymonosulfate(PMS)activation for OG *** this work,we successfully applied a magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid fabricated by a simple hydrothermal method for OG removal in *** characteristics of the hybrid were investigated by Xray diffraction,scanning electron microscopy,energy-dispersive X-ray spectroscopy,Fourier transform infrared spectroscopy,Brunauer–Emmett–Teller method,vibrating sample magnetometry,electron paramagnetic resonance,thermogravimetric analysis,and X-ray photoelectron *** effects of operational parameters(i.e.,catalytic system,catalytic dose,solution pH,and temperature)were *** results exhibited that 96.8% of OG degradation was obtained with MnFe_(2)O_(4)/α-MnO2(1:9)/PMS system in 30 min regardless of solution pH ***,the possible reaction mechanism of the coupling system was proposed,and the degradation intermediates of OG were identified by mass *** radical quenching experiments and EPR tests demonstrated that SO_(4)•̶,O_(2)•̶,and 1O2 were the primary reactive oxygen species responsible for the OG *** hybrid also displayed unusual stability with less than 30%loss in the OG removal after four sequential ***,magnetic MnFe2O4/α-MnO2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.

关键词： MnFe_(2)O_(4)/α-MnO_(2) Peroxymonosulfate Orange G Catalytic degradation Reusability

Is convenience really king? Comparative evaluation of catastrophic costs due to tuberculosis in the public and private healthcare sectors of Viet Nam: a longitudinal patient cost study

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贫困所致传染病(英文) 2024年第2期13卷 17-28页

作者： Nguyen Hoa Binh Quang Vo Luan Nguyen Forse Rachel Jeanette Wiemers Anja Maria Christine Huynh Huy Ba Dong Thuy Thi Thu phan Yen Thi Hoang Creswell Jacob Dang Thi Minh Ha Nguyen Lan Huu Shedrawy Jad L?nnroth Knut Nguyen Tuan Dinh Van Dinh Luong Annerstedt Kristi Sidney Codlin Andrew James National Lung Hospital Ha Noi Viet Nam Friends for International TB Relief Ha Noi Viet Nam Department of Global Public Health WHO Collaboration Centre On Tuberculosis and Social Medicine Karolinska Institute Stockholm Sweden Stop TB Partnership Geneva Switzerland Pham ngoc Thach Hospital Ho Chi Minh City Viet Nam

Background In Viet Nam, tuberculosis (TB) represents a devastating life-event with an exorbitant price tag, partly due to lost income from daily directly observed therapy in public sector care. Thus, persons with TB may seek care in the private sector for its flexibility, convenience, and privacy. Our study aimed to measure income changes, costs and catastrophic cost incurrence among TB-affected households in the public and private *** Between October 2020 and March 2022, we conducted 110 longitudinal patient cost interviews, among 50 patients privately treated for TB and 60 TB patients treated by the National TB Program (NTP) in Ha Noi, Hai Phong and Ho Chi Minh City, Viet Nam. Using a local adaptation of the WHO TB patient cost survey tool, participants were interviewed during the intensive phase, continuation phase and post-treatment. We compared income levels, direct and indirect treatment costs, catastrophic costs using Wilcoxon rank-sum and chi-squared tests and associated risk factors between the two cohorts using multivariate *** The pre-treatment median monthly household income was significantly higher in the private sector versus NTP cohort (USD 868 vs USD 578;P=0.010). However, private sector treatment was also significantly costlier (USD 2075 vs USD 1313;P=0.005), driven by direct medical costs which were 4.6 times higher than costs reported by NTP participants (USD 754 vs USD 164;P<0.001). This resulted in no significant difference in catastrophic costs between the two cohorts (Private: 55% vs NTP: 52%;P=0.675). Factors associated with catastrophic cost included being a single-person household [adjusted odds ratio [(aOR=13.71; 95% confidence interval (CI): 1.36–138.14;P=0.026], unemployment during treatment (aOR=10.86; 95%CI: 2.64–44.60;P<0.001) and experiencing TB-related stigma (aOR=37.90; 95%CI: 1.72–831.73;P=0.021).Conclusions Persons with TB in Viet Nam face similarly high risk of catastrophic costs whether treated in the

关键词： Tuberculosis Patient cost Catastrophic cost Private sector Comparative analysis Viet Nam

Hepatitis B vaccination status and associated factors among health science students

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Asian Pacific Journal of Tropical Medicine 2023年第5期16卷 213-219页

作者： Binh Thanh Nguyen Lan Y Vo Tap Van Nguyen Minh Cong Vo Tinh Dang Pham Han Thi ngoc Nguyen Lynda Boyer-Chu giao Huynh Faculty of Medicine Tra Vinh UniversityTra Vinh CityTra Vinh ProvinceVietnam Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam Faculty of Medical Management Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam Department of Ear Nose Throat-Head and Neck Surgery FV hospitalHo Chi Minh CityVietnam Department of Anaesthesia and Intensive Care FV hospitalHo Chi Minh CityVietnam Infection Control Department University Medical Center Ho Chi Minh CityHo Chi Minh CityVietnam San Francisco Unified School District San FranciscoCaliforniaUSA

Objective:To evaluate hepatitis B virus(HBV)vaccine coverage and its associated factors among health science students in ***:This cross-sectional study involving 459 health science students at Tra Vinh University was conducted between April and June *** were collected using a structured questionnaire with items on sociodemographic characteristics,knowledge and attitude about HBV,and vaccination status.A multivariable logistic regression model was used to explore the factors associated with vaccination ***:The majority of participants were female(65.8%)and enrolled at the medical school(56.2%).A total of 30.3%participants received the full dose of the HBV *** percentages of participants with sufficient knowledge and positive attitudes toward HBV infection were 75.2%and 43.4%,*** was 11.8 times higher in sixth-year medical students than any healthcare student in their first-year[adjusted odds ratio(aOR)11.8,95%CI 3.1-45.1,P<0.001],and the coverage was also significant higher in those who had sufficient knowledge(aOR 2.0,95%CI 1.1-3.9,P<0.05)and positive attitudes(aOR 3.0,95%CI 1.9-4.8,P<0.05)than in their ***:The majority of students were not fully vaccinated against HBV,indicating they were vulnerable to the *** and authorities should reinforce health education messages aimed at encouraging all students to get vaccinated with the HBV vaccine,enhance their awareness and knowledge of HBV,and improve attitudes toward HBV infection prevention.

关键词： Hepatitis B Knowledge Attitude Practice Vaccination Students

Electrochemical Immunosensor for Detection of Atrazine Based on Polyaniline/Graphene

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Journal of Materials Science & Technology 2016年第6期32卷 539-544页

作者： Nguyen Van Chu Nguyen Hai Binh Cao Thi Thanh Nguyen Van Tu Nguyen Le Huy Nguyen Tuan Dzung phan ngoc Minh Vu Thi Thu Tran Dai Lam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau Giay.HanoiViet Nam School of Chemical Engineering.Hanoi University of Science and Technology 1 Dai Co VietHanoiViet Ham Institute for Tropical Technology.Vietnam Academy of Science and Technology 18 Hoang Quoc VietHanoiViet Nam Center for High Technology Development Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoiViet Nam University of Science and Technology of Hanoi.18 Hoang Quoc Viet HanoiViet Ham Graduate University of Science and Technology.Vietnam Academy of Science and Technology 18 Hoang Quoc Viet.HanoiViet Nam

In this study, a novel layer-by-layer polyaniline/graphene （PANi/Gr） structure for electrochemical detec- tion of atrazine was developed. Gr film was synthesized by thermal chemical vapor deposition （CVD） method and transferred onto the PANi-predeposited microelectrode. The properties of PANi/Gr film were thoroughly investigated by high-resolution transmission electron microscopy and Raman techniques. The most attractive feature of this system is a suitable microenvironment, which could provide an amplifi- cation of the conductive signal, thus may contribute to enhancing electron transfer and subsequently improve the sensitivity in electrochemical measurements. With low detection limit （- 43 × 10 -12 g/L）, ac-ceptable stability and good reproducibility, the proposed electrochemical immunosensor could be advantageously extended for multiplexed detection of other agents of environmental pollution.

关键词： Electrochemical immunosensor Polyaniline Graphene Atrazine

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越南高校数字图书馆中开源软件的应用研究

越南高校数字图书馆中开源软件的应用研究

作者： phan ngoc DONG（潘玉东）南京大学

学位级别：硕士

随着信息技术广泛的发展,数字图书馆得到了广泛的应用。该类图书馆的优势在于既可以收集并生成多个不同的信息源,又可以为研究者提供一个丰富而方便、广泛且深入的知识图谱。因此,在某种角度,数字图书馆不仅是研究者在研究过程中的重要... 详细信息

随着信息技术广泛的发展,数字图书馆得到了广泛的应用。该类图书馆的优势在于既可以收集并生成多个不同的信息源,又可以为研究者提供一个丰富而方便、广泛且深入的知识图谱。因此,在某种角度,数字图书馆不仅是研究者在研究过程中的重要工具,且是学术前沿交流的一个平台。越南的数字图书馆建设始于2003年,并得到政府高层的重视。近年来,国内许多图书馆已经开启了现代化管理并采用数字化的管理的方式,该类管理方式在应用科学与艺术的两个领域中得到了成效显著。但即使如此,至今,在越南的数字图书馆还处于初级发展阶段,原因有二,一方面由于越南图书馆的管理制度并未与时俱进,行业监管部门缺乏规划和监督,应用的管理软件多且杂,各校图书馆的数据库之间无法有效链接,导致资源分散;另一方面则是软件使用门槛高,目前大多数字图书馆管理软件采购自国外,不但无越南语版本,且安装过程复杂,缺乏使用说明等材料,普通员工也没有正式培训的机会,导致技术人员缺乏。本研究通过问卷调查法来探讨越南图书馆开源软件应用的现状,力图提供关于越南数字图书馆对开源软件应用情况以及的一个较全面的,专业的看法。以期寻找对应的解决方案,助力越南国内的数字图书馆发展。本研究共七章,具体如下:第一章,问题提出部分。该部分的主要内容包括:研究背景、概念、研究内容及研究方法。第二章,文献综述部分。该部分主要包括国内外研究综述。通过对中越两国对开源软件的应用现状分析,从而指出开源软件和封闭源软件的优缺点以及做出概括性评价。第三章,基本理论部分。该部分主要包括内容管理、开源软件的基本理论以及数字图书馆理论。第四章,数字图书馆开源软件绩效评价实施与结果分析部分。这一部分首先分析越南高校数字图书馆软件的应用情况,然后做出相应结论。第五章,越南高校图书馆开源软件应用的策略方案部分。该部分根据数字图书馆开源软件应用的策略原则提出学术、管理、技术、环境等的四种策略。第六章,个案研究部分。研究以越南大叻大学为研究对象;首先探讨关于开源软件在越南大叻大学应用过程中所遇到的具体问题,从而提出具有针对性的解决方案。第七章,结论部分。根据前文的研究结果以及具体分析内容,该部分把研究所得到的结果进行总结提炼,同时进一步提出开源软件未来的发展前景和应用研究方向。

关键词：越南数字图书馆开源软件内容管理

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越南汉语本土化教材建设初探

越南汉语本土化教材建设初探

作者： LAM ngoc phan (林玉芬) 福建师范大学

学位级别：硕士

为了满足不同母语背景、不同文化背景和学习需求的学习者的需要,近来国别化教材成为研究热点,也取得了一些研究成果。目前,越南的主要对对外汉语教材研究大都基于通用性教材,国别化教材的编写与研究数量不多。作为母语是越南语的汉语学... 详细信息

为了满足不同母语背景、不同文化背景和学习需求的学习者的需要,近来国别化教材成为研究热点,也取得了一些研究成果。目前,越南的主要对对外汉语教材研究大都基于通用性教材,国别化教材的编写与研究数量不多。作为母语是越南语的汉语学习者,笔者从自身学习经历出发,通过对越南现有的本土化教材《汉语》课文、生词、语法、练习各方面的统计分析与研究,结合调查数据总结越南国别教材是否体现出国别性,以及存在的优点与不足,希望能对越南国别化教材的编写提出参考。

关键词：国别化教材《汉语》教材分析课文生词语法练习