Papers by Nguyen Duy Phuong
arXiv (Cornell University), Jan 3, 2016
In this paper we introduce a unified approach to deal with incidence problems between points and ... more In this paper we introduce a unified approach to deal with incidence problems between points and varieties over finite fields. More precisely, we prove that the number of incidences I(P, V) between a set P of points and a set V of varieties of a certain form satisfies I(P, V) − |P||V| q k ≤ q dk/2 |P||V|. This result is a generalization of the results of Vinh (2011), Bennett et al. (2014), and Cilleruelo et al. (2015). As applications of our incidence bounds, we obtain results on the pinned value problem and the Beck type theorem for points and spheres. Using the approach introduced, we also obtain a result on the number of distinct distances between points and lines in F 2 q , which is the finite field analogous of a recent result of Sharir et al. (2015).
Academic Journal of Interdisciplinary Studies, 2021
The victory of the Vietnamese people in the war is inseparable from the great support of the inte... more The victory of the Vietnamese people in the war is inseparable from the great support of the international community and the peacekeeping force worldwide. Not only receiving material support, but more importantly, Vietnam also received the support on intellectual resources from international friends through the training of officers in all fields. The Soviet Union's role as the leader of the socialist bloc held the most important position in that immense help. Based on archived sources that are diplomatic documents between the two countries, as well as the latest research achievements, the article analyzes the support of The Soviet Union for Vietnam in the field of officer training in many aspects. The results confirm the great contributions of The Soviet Union to the Vietnam war against the United States to build and protect the independence of Vietnamese people, and at the same time contribute to explain the effects of the “Soviet model” in Vietnam in the past as well as nowada...
Reserve Navigation System of Tether Powered Unmanned Aerial Platform in Conditions of Turbulent Atmosphere
Communications in Computer and Information Science, 2020
Isolation and Characterization of a OsRap2.4A Transcription Factor and its Expression in Arabidopsis for Enhancing High Salt and Drought Tolerance
Current Science, 2015
Dehydration responsive element/C-repeat (DRE/CRT) is a cis-acting element involved in the regulat... more Dehydration responsive element/C-repeat (DRE/CRT) is a cis-acting element involved in the regulation of abiotic stress-responsive gene expression in higher plants. Using a 50-nucleotide bait containing DRE cis-acting element localized on the downstream mini TATA box of glutamate dehydrogenase-like protein ( JRC2606 ) promoter in yeast one-hybrid screening, we have identified two transcription factors belonging to A6 subgroup of DREB subfamily - OsRap2.4A and OsRap2.4B. Expression of OsRap2.4A was induced by drought, high salt and temperature stress conditions, and also by abscisic acid treatment. Binding assay showed that OsRap2.4A bound specifically to DRE sequence in both in vivo and in vitro experiments. Transient expression of OsRap2.4A in protoplasts revealed that OsRap2.4A functioned as a transcriptional activator and upregulated expression of the GUS re-porter gene. Transgenic Arabidopsis plants expressing OsRap2.4A at low level showed no significant growth re-tardation under...
Intensive agriculture, based on ‘green revolution’ practices such as monocultures, agro-chemical ... more Intensive agriculture, based on ‘green revolution’ practices such as monocultures, agro-chemical inputs and intensive tillage with high level of fuel consumption, has helped to meet the rapidly-growing needs of global populations and markets. Yet, agricultural intensification also has devastating effects on the environment, affects farm profitability and impacts human health, of farmers and consumers. Especially the non-guided use of chemically-synthesized pesticides now poses real social problems that occur across the globe, and is having devastating consequences for wildlife and world’s biodiversity. Such a situation can only be remediated by a paradigm shift, an increased attention to applied (on-farm) research and grower education, and a deliberate promotion of practices that safeguard nature and the environment.
Ket qua hop tác nghiên cuu ve quan ly tài nguyên đat giua vien nghiên cuu phát trien pháp và vien tho nhưong nông hóa
Journal of Agriculture and Rural Development in the Tropics and Subtropics, 2017
To promote pro-poor payments for environmental services, it is necessary to identify institutiona... more To promote pro-poor payments for environmental services, it is necessary to identify institutional options that reduce transaction costs and organisational problems associated with establishing and maintaining contracts with small-scale environmental service providers. This study examined the dual functionality of state forest enterprises (SFEs) in the implementation of the Payments for Forest Environmental Services (PFES) Program in Vietnam. We considered whether SFEs’ involvement in the programme could reduce transaction costs and organisational problems. Data were collected from Tu Ly SFE in Hoa Binh province, northern Vietnam and from implementing agencies at various institutional levels. A survey of households participating in the SFE loan programme, and two stakeholder workshops were executed in 2014. The results revealed that Tu Ly SFE plays an important role in the livelihood of many farmers. A SWOT analysis exhibited SFEs’ advantage over other state agencies in implementing...
Vietnam Journal of Agricultural Sciences, 2021
Southern rice black-streaked dwarf virus (SRBSDV) causes severe epidemical disease on rice with t... more Southern rice black-streaked dwarf virus (SRBSDV) causes severe epidemical disease on rice with the infected area up to millions of hectares in South China and North and Central of Vietnam. So far, there are no effective, cheap, quick, and practicable methods for diagnosing SRBSDV. The conventional RT-PCR technique is the most popular method for detecting SRBSDV with high accuracy. However, it is hard to apply this method for large-scale SDBSDV diagnosis because of the requirements of expensive reagents and instruments, as well as complex procedures. Meanwhile, SRBSDV diagnostic techniques based on antigen detection have outstanding advantages due to their low cost, easy manipulation, and wide application possibility. Today, there are still no commercially available specific antibodies to SRBSDV. In a previous study, to develop the SRBSDV diagnostic technique by the ELISA technique, a SRBSDV specific antibody was generated by a recombinant P10 envelope protein (66kDa), which has a t...
Reliability Evaluation of a Hexacopter-Based Flight Module of a Tethered Unmanned High-Altitude Platform
Communications in Computer and Information Science, 2019
This article discusses a model on the basis of a multidimensional Markov process applied for eval... more This article discusses a model on the basis of a multidimensional Markov process applied for evaluation of the reliability characteristics of a tethered multirotor high-altitude platform based on a hexacopter. The proposed model takes into account the increase in the functional load after the failure of an element on the remaining operating ones, and also takes into account the location of the failed elements.
Science & Technology Development Journal - Engineering and Technology, 2021
Skin graft is effective method to reconstruct large lesions on the skin. Long-term injuries such ... more Skin graft is effective method to reconstruct large lesions on the skin. Long-term injuries such as burns, skin ulcers, skin flaps, skin grafts... can affect the health of the patient. Skin plays a very important role because it protects the body from dehydration, helps regulate temperature, helps prevent pathogenic bacteria or viruses from entering the body and minimizes skin deformation. In recent years the cold plasma has been used to aid the treatment of chronic skin wounds, burns, ulcers,... To assess the effectiveness of the wound healing process of Plasma, this study uses non – invasive (assess the shrinkage of the wound, the temperature change of the wound) and invasive methods (regeneration of skin tissue structure) to evaluate the therapeutic effects of Dielectric Barrier Dissections Plasma (DBD Plasma) in skin graft surgery. Experimenting with the entire skin graft model on mice, this use of DBD Plasma treatment along with clinical evaluation methods, this is to compare w...
Vietnam Journal of Biotechnology, 2020
Rehmannia glutinosa (Gaertn.) Libosch. is an herbal plant, which belongs to the Srcophulariaceae ... more Rehmannia glutinosa (Gaertn.) Libosch. is an herbal plant, which belongs to the Srcophulariaceae family, containing the main active ingredients such as catalpol and verbacoside in its root tubers. In traditional medicine, R. glutinosa tubers have been used in the fresh or dried tuber root or the prepared rehamannia root. They not only possess the comprehensive pharmacological actions in the blood system, endocrine system but also used mainly for anti-tumor treament, immune-enhancement, anti-diabetes, treament for concretion in the urinary tract, etc. R. glutinosa is naturally distributed in China, Korea and Japan. This species was introduced into Viet Nam since 1958 and then planted widely in many the Northern plain and midland provinces. In Vietnam, R. glutinosa produces flowers without seeds, therefore the plant has been mainly propagated by slicing tubers. In this work, we investigated the effect of some plant hormones and sucrose contents on the ability to producing microtubers ...
Vietnam Journal of Biotechnology, 2018
ASEAN Journal on Science and Technology for Development, 2017
ZnO semiconductor nanostructures have been synthesized by thermal evaporation of mixture of ZnO a... more ZnO semiconductor nanostructures have been synthesized by thermal evaporation of mixture of ZnO and graphite powders. The thin layer of gold coated on Si substrates was used as a catalyst. The structure analysis shows high crystallinity of ZnO, their preferred orientation along the (0 02) plane of the wurtzite phase and their chemical purity. The scanning electron microscopy (SEM) images of products indicate that ZnO nanowires have a diameter of about 40 - 150 nm and a length of up to tens of micrometers. The morphology and structure of ZnO nanowires and nanorods depend on the thicknesses of the Au layers. The fact that Au nanoparticles are located at the tips of the nanowires represents a strong evidence for a growth process dominated by the vapor - liquid - solid mechanism. The low temperature photoluminescence spectra of the ZnO nanowires indicate a group of the ultraviolet narrow peaks and a blue - green very broad peak at 500 nm.
Adaptive System for Analysis and Interpretation of Combined Well Test Data (Russian)
SPE Russian Petroleum Technology Conference, 2017
Forum Mathematicum, 2018
We prove that if we are given a set of points 𝒫 {\mathcal{P}} and set of lines ℒ {\mathcal{L}} in... more We prove that if we are given a set of points 𝒫 {\mathcal{P}} and set of lines ℒ {\mathcal{L}} in 𝔽 q 2 {\mathbb{F}_{q}^{2}} such that | 𝒫 | | ℒ | ≳ q 8 / 3 {|\mathcal{P}||\mathcal{L}|\gtrsim q^{8/3}} , then the set of distinct distances between points from 𝒫 {\mathcal{P}} and lines from ℒ {\mathcal{L}} contains a positive proportion of all distances. Using the same techniques, we also obtain a generalization of this result in higher dimensional cases.
TAP CHI SINH HOC, 2019
Galactinol synthase (GolS) is a key biological catalyst for the synthesis of the raffinose oligos... more Galactinol synthase (GolS) is a key biological catalyst for the synthesis of the raffinose oligosaccharides (RFOs) which play important roles in abiotic stress adaptation of plants, especially drought tolerance. GolS gene has been isolated on a variety of plants in order to create material resources for generating transgenic plants resistant to adverse environmental factors. In our previous research, we have isolated a GolS gene from drought stress cDNA library of Oryza sativa L. Moctuyen (named OsGolS). In this study, the expression vector pCAM-Rd/OsGolS carrying the isolated OsGolS gene under the control of stress-inducible Rd29A promoter was constructed and introduced into Agrobacterium tumefaciens LBA4404, which was used for maize transformation. PCR and Real-time PCR assay indicated that transgene was integrated in the genome of the regenerated Zea mays plants. Reverse transcription-PCR showed that the OsGolS was transcribed into mRNA in Zea mays and was highly expressed. Thes...
Expert Systems with Applications, 2019
Context-aware recommender systems (CARS) are specially designed to take into account the contextu... more Context-aware recommender systems (CARS) are specially designed to take into account the contextual conditions under which a user experiences an item, with the goal of generating improved recommendations. A known difficulty when constructing recommender systems is data sparseness, which reduces the effectiveness of collaborative filtering algorithms. While using contextual information provides fine-grained signals for the recommendation process, it makes the data even sparser and increases the computational complexity. In this paper, we present a method for making context-aware recommendations, which is less sensitive to data sparseness. The proposed method exploits the transitivity of the interactions between users and items on the user-item graph to augment the direct interactions, thus reducing the negative effect of sparse data. Based on graph transitivity we introduce a new graph-based association measure that we use as a measure of similarity between two users or two items in nearest neighbor recommendation methods. This combination of graph-based similarity measure with nearest neighbor methods allows considering more contextual conditions at a lower risk of being affected by data sparseness caused by additional contextual dimensions. We experimentally evaluated the proposed method on three contextually-tagged data sets. The results show that our method outperforms several baselines and state-of-the-art context-aware recommendation methods.
Economic Integration and Environmental Pollution Nexus in Asean: A PMG Approach
Beyond Traditional Probabilistic Methods in Economics, 2019
The nexus between economic integration and environmental pollution has been intensively analyzed ... more The nexus between economic integration and environmental pollution has been intensively analyzed by a number of studies, but the empirical evidence more often than not remains controversial and ambiguous. This research applies the estimation technique Pooled Mean Group (PMG) introduced by Pesaran et al. (1999) and the cointegration test of Fisher-Johansen to examine the impacts of economic integration on environmental quality (measured by the CO\(_2\) emissions per capita) in Asean 8 countries during the 1986–2014 period. The empirical results provide a strong statistical evidence that economic integration increases environmental pollution in Asean countries, yet there exists an inverted U-shape of ecological Kuznets curve. The time required to return to equilibrium is 4 years, and the turning point’s GDP per capita is about 9,400 US Dollar/year (at constant 2010 prices). This research suggests that policy-makers should control the environmental standards in the projects to improve environmental pollution, to achieve sustainable economic development in the long-run.
Proceedings of the American Mathematical Society, 2018
We use methods from spectral graph theory to obtain bounds on the number of incidences between k-... more We use methods from spectral graph theory to obtain bounds on the number of incidences between k-planes and h-planes in F d q which generalize a recent result given by Bennett, Iosevich, and Pakianathan (2014). More precisely, we prove that the number of incidences between a set P of k-planes and a set H of h-planes with h ≥ 2k + 1, which is denoted by I(P, H), satisfies I(P, H) − |P||H| q (d−h)(k+1) q (d−h)h+k(2h−d−k+1) 2 |P||H|.
2016 IEEE RIVF International Conference on Computing & Communication Technologies, Research, Innovation, and Vision for the Future (RIVF), 2016
In recent years, sharing electronic medical records (EMRs) for more researchers outside the assoc... more In recent years, sharing electronic medical records (EMRs) for more researchers outside the associated institutions is significant. For privacy preservation of the corresponding patients and the associated institutions, a de-identification task on the EMRs to be shared is a must. Although the deidentification task has been considered with positive research outcomes worldwide, especially those from the i2b2 (Informatics for Integrating Biology and the Bedside) shared tasks in 2006 and 2014, the task has not yet been a solved problem and still needs more investigation realistically. In this paper, we propose an automatic de-identification solution in a multilevel hybrid semisupervised learning paradigm with a key focus on correctly identifying protected health information (PHI) in the EMRs. Similar to the existing works, our work defines a hybrid approach by combining a machine learning-based method with a conditional random fields model and a rule-based method in a post-processing phase to handle the PHI types with disambiguity. Nevertheless, our work is more general and practical. First, it considers the structure complexity of each EMR so that each section can be treated properly for more correct PHI identification up to its structure complexity: structured, semistructured, or un-structured. Second, each EMR is then examined in our approach at three different levels of granularity such as a token level in the supervised learning phase, an entity level in the rule-based post-processing phase, and a section level along with the structure complexity in the semi-supervised learning phase. Many various detail levels will give our approach a deeper look at each EMR for more effectiveness. Third, our solution is conducted in a self-training manner so that it can get started with a small annotated data set in practice and get more effective with new EMRs over time. Evaluated with the i2b2 data set in comparison with the related works, our solution is effective with better F-measure values for the AGE, LOCATION, and PHONE PHI types and comparable for the other PHI types.
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Papers by Nguyen Duy Phuong