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Xp-tree : Xpath 로케이션 스텝의 효율화를 위한 새로운 공간기반의 인덱싱 기법
Nguyen Van Trang(Nguyen Van Trang),황정희(Jeong Hee Hwang),류근호(Keun Ho Ryu) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1B
Nowadays, with the rapid emergence of XML as a standard for data exchange over the Internet had led to considerable interest in the problem of data management requirements such as the need to store and query XML documents in which the location path languages Xpath is of particular important for XML application since it is a core component of many XML processing standards such as XSLT or XQuery. This paper gives a brief overview about method and design by applying a new spatial-based indexing method namely Xp-tree that used for supporting Xpath. Spatial indexing technique has been proved its capacity on searching in large databases. Based on accelerating a node using planar as combined with the numbering schema, we devise efficiently derivative algorithms, which are simple, but useful. Besides that, it also allows to trace all its relative nodes of context node in a manner supporting queries natural to the types especially Xpath queries with predicates.
Nguyen Ba Tiến,Hoai-Nam Nguyen,Hoang-Ha Le,Tran Thu Trang,Chau Van Dinh,Ha-Nam Nguyen,Gyoo Seok Choi 한국인터넷방송통신학회 2023 International Journal of Internet, Broadcasting an Vol.15 No.2
A common approach to the problem of predicting student test scores is based on the student's previous educational history. In this study, high school transcripts of about two thousand candidates, who took the High-school Student Assessment (HSA) were collected. The data were estimated through building a regression model - Random Forest and optimizing the model's parameters based on Genetic Algorithm (GA) to predict the HSA scores. The RMSE (Root Mean Square Error) measure of the predictive models was used to evaluate the model’s performance.
Nguyen, Ngoc-Anh,Nguyen, Tham Thao-Trang,Nguyen, Van-Toan,Ali, Yousuf,Sim, Eunju,Choi, Ho-Suk Elsevier 2019 CATALYSIS TODAY - Vol.337 No.-
<P><B>Abstract</B></P> <P>We report a method for synthesizing a plasma-treated sponge-like NiAu nanoalloy to enhance the hydrogen evolution reaction (HER) performance. First, an as-prepared sponge-like NiAu nanoalloy is obtained by using NaBH<SUB>4</SUB> to reduce a NiCl<SUB>2</SUB> and HAuCl<SUB>4</SUB> mixture without using any surfactant. Second, this as-prepared sponge-like NiAu nanoalloy is treated by argon plasma under atmospheric pressure with a treatment time of 15 min to obtain the final plasma-treated sponge-like NiAu nanoalloy. The HER electrocatalytic performance of the plasma-treated sponge-like NiAu nanoalloy is then investigated in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. From the results, the plasma-treated sponge-like NiAu nanoalloy exhibits enhanced HER performance compared to the as-prepared sponge-like NiAu nanoalloy due to the exposure of more active/edge sites. The overpotential at a current density of 10 mA.cm<SUP>−2</SUP> of the plasma-treated sponge-like NiAu nanoalloy (88 mV) is lower than that of the as-prepared sponge-like NiAu nanoalloy (134 mV), and this is due to the plasma treatment process. In addition, plasma-treated sponge-like NiAu nanoalloy shows an excellent durable ability of HER activity for 80,000 s.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sponge-like NiAu nanoalloys are prepared using a simple method without any surfactant. </LI> <LI> Electronic coupling between Ni and Au atoms can improve the HER activity. </LI> <LI> The plasma-treated sponge-like NiAu nanoalloy exhibits enhanced HER performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Acute Myocardial Infarction in Patients With Single Coronary Artery: A Case Report
Nguyen Thi Huyen,Nguyen Ngoc Trang,Nguyen Khoi Viet,Le Thi Thuy Lien,Hoang Thi Van Hoa,Phung Bao Ngoc,Vu Dang Luu 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.2
A single coronary artery (SCA) is a rare congenital anomaly. In most cases, it is an incidental finding on coronary angiography and has no clinical significance. However, it can cause angina, myocardial infarction, or even sudden death. Reports of SCA with acute myocardial infarction are very rare in the medical literature. This case study presents a patient with SCA from the right aortic sinus with severe stenosis in the proximal and distal part of the right coronary artery, which was detected using cardiac angiography and cardiac multidetector computed tomography (MDCT) with acute myocardial infarction.
Trang Nguyen Thi Kieu,Phuong Thao Dao Vu,Nguyet Nguyen Thi,Dien Nguyen Dac,Van Hoang Nhu,Van Thu Vu,Tran Manh Trung,Pham Hung Vuong,Tam Phuong Dinh 한국물리학회 2024 Current Applied Physics Vol.63 No.-
Gold nanoflowers (AuNF) were synthesized on a glassy carbon electrode via a one-step, eco-friendly protocol in deep eutectic solvent (DES) of choline choloride and urea, called reline, for label-free detection of DNA hybridization. DES is eco-friendly, low-cost, biocompatible, and nontoxic, and it can be used as an electrolyte to synthesize nanomaterials by using the electrochemical method. In this protocol, highly branched and stable AuNFs were obtained without using any surfactants for DNA sensor application. The electrochemical performance of the AuNF-modified electrode was studied by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the AuNF-based DNA biosensor exhibited a sensitivity of 294.9 Ω nM−1cm−2 and 218 μA nM−1cm−2 and a limit of detection (LOD) of 10−9 M. The remarkable sensitivity and low LOD could be attributed to the good conductivity of AuNFs for accelerating electron transfer, resulting in obvious signal amplification. The DNA biosensor showed good reproducibility (RSD <3.65 %) and acceptable stability and selectivity. Its excellent performance in DNA detection suggested that the proposed electrochemical DNA sensor has great application potential in clinical diagnosis.
Impacts of Foreign Direct Investment on Human Capital in ASEAN
Hoi Van NGUYEN,Thuy Thi Thu NGUYEN,Tha Hien TO,Duong Quy DANG,Trang Thi Dai Luong 한국유통과학회 2020 유통과학연구 Vol.18 No.9
Purpose: Research and development of human capital in countries bring sustainable development to the nations. Especially for developing countries, the attraction of foreign direct investment not only brings economic growth to the country but also contributes to improving human capital. This study aims to assess the impact of foreign direct investment on human capital in ASEAN countries. Research design, data and methodology: With data collected from ASEAN countries from 1990 to 2019, panel data analysis is performed with revised model types (the Pooled OLS, Fixed effect model, Random effect model and regression with Driscoll-Kraay standard errors). Result: The results of the regression analysis show that FDI has a positive impact on human capital. At the same time, the study also found that public investment in education also positively affects human capital; the life expectancy factor does not affect human capital. Conclusions: With this research result, the authors also proposed a number of solutions to improve human capital by attracting FDI and improving the efficiency of investment for the education of ASEAN countries. Besides, public expenditure on education also plays an important role in raising human capital. Therefore, investment in education should be promoted further in the future.
Do Van Cong,Nguyen Thi Thu Trang,Nguyen Vu Giang,Tran Huu Trung,Nguyen Thuy Chinh,Mai Duc Huynh,Thai Hoang,Jun Seo Park(박준서) 한국고분자학회 2016 폴리머 Vol.40 No.3
This study describes the preparation and characterization of nanocomposites obtained by melt-mixing of poly (ethylene-co-vinyl acetate) (EVA), polylactic acid (PLA), and TiO₂ nanoparticles (TNPs) via three different methods of direct mixing, one-step, and two-step methods. Vinyltrimethoxysilane was used as a surface modifier for the TNPs. The one-step method showed the best suitability for the preparation of EVA/PLA/TiO₂ nanocomposites. The increase in torque and the adhesion of the TNPs with EVA/PLA matrix in these nanocomposites showed enhanced interfacial interactions between EVA, PLA chains, and TNPs. The tensile strength, Young’s modulus, dynamic storage modulus, and thermooxidative stability of the one-step prepared nanocomposites were higher than those of two other nanocomposites and that of the EVA/PLA blend, reaching maximum values at 2.0 wt% of TNPs.
The Role of Zn Doping on the Catalytic Activity of the Nanoparticle Perovskite La0.7Sr0.3MnO3
Tran Thi Minh Nguyet,Nguyen Quang Huan,Tran Que Chi,Do The Chan,Nguyen Doan Thai,Nguyen Cong Trang,Luu Tien Hung,Le Van Tiep,Nguyen Van Qui 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The nanometer complex oxide La0:7Sr0.3Mn0.6Zn0.₄O₃ was prepared by using a Sol-Gel method with citric acid as a ligand. The in uence of Zn doping of La0.7Sr0.₃MnO₃ on the structure, the morphology, the surface properties and on the catalytic activity of material was studied by using X-ray diraction (XRD), transmission electron microscopy (TEM), a high-resolution images and selected area electron diraction (SAED), physical adsorption and temperature programmed surface reaction (TPSR) methods. The results showed that perovskite La0:7Sr0:3Mn0:6. Zn0.₄O₃ could well catalyse propene oxidation in the temperature range 190 { 280 ℃, which was reduced to 100 { 120 ℃ for catalyst La1-χSrχMnO₃ The nanometer complex oxide La0:7Sr0.3Mn0.6Zn0.₄O₃ was prepared by using a Sol-Gel method with citric acid as a ligand. The in uence of Zn doping of La0.7Sr0.₃MnO₃ on the structure, the morphology, the surface properties and on the catalytic activity of material was studied by using X-ray diraction (XRD), transmission electron microscopy (TEM), a high-resolution images and selected area electron diraction (SAED), physical adsorption and temperature programmed surface reaction (TPSR) methods. The results showed that perovskite La0:7Sr0:3Mn0:6. Zn0.₄O₃ could well catalyse propene oxidation in the temperature range 190 { 280 ℃, which was reduced to 100 { 120 ℃ for catalyst La1-χSrχMnO₃
Thuong Nhan Phu Nguyen,Chi Khang Van,Thu Trang Thi Nguyen,Thuan Van Tran,Quang Binh Hoang,Long Giang Bach 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.13
This study aimed to evaluate the encapsulation of pomelo (Citrus grandis (L.) Osbeck) essential oils using the spray drying technique. The parameters of the process include concentration of maltodextrin (20–35% by wt%/wt%), concentration of essential oil (1–2.5% by wt%/wt%), inlet temperature of spray drying (120–180 °C), and feed flow rates (120–240 mL/h) were soundly examined. The utilization of suitable parameters as the concentration of maltodextrin at 30% (by wt%/wt%), the concentration of essential oil at 1.5% (by wt%/wt%), the inlet temperature of 140 °C, and feed flow rate of 120 mL/h showed the highest drying yields (90.05%), microencapsulation yield (75.59%), and microencapsulation efficiency (89.44%). TGA and DSC results verified higher stability of Citrus grandis essential oil after encapsulation. The encapsulation of pomelo essential oils maintained most of the major components in comparison with the non-encapsulated essential oils without any significant changing in powder-obtained quality.
XML 문서를 위한 인덱스 기반의 명세 / 속성 기반 접근 제어
최남규(Nam Kyu Choi),Van-Trang-Nguyen(Van Trang Nguyen),차효성(Cha hyo soung),구미숙(Gu Mi Sug),황정희(Jeong Hee Hwang),류근호(Keun Ho Ryu) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ
최근 연구되고 있는 XML 문서를 위한 접근 제어에 관한 연구는 간접적으로 접근 권한을 표현하는 명시 기반 접근 제어 방법과 각 객체에 직접적인 접근 권한을 표현하는 속성 기반 접근 제어 방법으로 구분할 수 있는데, 명세 기반 접근 제어 방법은 공간 효율적이며, 속도 비효율적인 특성을 갖으며, 속성 기반 접근 제어 방법은 속도 효율적이며, 공간 비효율적인 특성을 갖는다. 또한 이러한 연구의 초점은 안전한 접근 제어를 보장하면서, 부가적인 비용 증가를 줄이고자 하지만, 대부분의 연구에서는 인덱스 기법에 기반 하지 않고 문서 전체 또는 일부를 액세스 하므로 탐색 비용 또는 데이터 처리 비용이 증가하고, 특정 기법에 국한 하여 적용하기 때문에 각 기법이 갖는 근본적인 문제점을 해결 할 수 없다. 따라서 이러한 문제점을 해결하기 위해 인덱스 기반의 전역 접근 제어와 지역 접근 제어 메커니즘 제안하고, 이를 기반으로 명세/속성 기반 접근 제어를 연계하여 강제 접근 제어(MAC)의 최소 접근 권한 정책을 지원하는 역할 기반 다중 레벨 접근 제어 모델에 적용하였다.