• Analyzing incomplete spatial data in air pollution predictionAnalyzing incomplete spatial data in air pollution prediction

    Abstract In air pollution studies at metropolis, as in Bangkok or Saigon, installation of new stations for monitoring dangerous pollution sources is costly. Using statistical models and analyzing data sets collected at good stations to predict air pollution levels at malfunctioning stations, therefore, are highly demanding. We study air polluti...

    pdf23 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 395 | Lượt tải: 0

  • Tập biến phân cấp cao của ánh xạ nhiễu theo nghĩa Benson trong tối ưu đa trịTập biến phân cấp cao của ánh xạ nhiễu theo nghĩa Benson trong tối ưu đa trị

    TÓM TẮT Trong bài báo này, chúng tôi tìm hiểu về chủ đề phân tích độ nhạy trong tối ưu đa trị, đây là một hướng nghiên cứu thu hút sự quan tâm của nhiều nhà toán học trên thế giới trong những năm gần đây. Dạng đạo hàm chính sử dụng trong bài là tập biến phân cấp cao (được giới thiệu bởi Khánh và Tuấn năm 2008). Đây có thể xem là một dạng suy rộ...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 284 | Lượt tải: 0

  • The determinant of the adjacency matrix of cycle-power graph C4nThe determinant of the adjacency matrix of cycle-power graph C4n

    The determinant of adjacency matrix of G is det(A(G) and kth eigenvalues of the adjacency matrix is E(G; k) which are independent of the choice of vertices in adjacency matrix and are an invariant of G, respectively. In 1974 and In 1980, N. Biggs [3] and D.M. Cvetkovic et.al [5] have published about determinant of adjacency matrix of some graph...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 304 | Lượt tải: 0

  • The conditions of some cayley digraphs containing hamiltonian path and hamiltonian circuitThe conditions of some cayley digraphs containing hamiltonian path and hamiltonian circuit

    Abstract For a finite semigroup S and a nonempty subset A of S the Cayley Digraph of S with respect to A, denoted by Cay(S, A) is the directed graph with vertex set S and arc set {(s, sa) | s ∈ S and a ∈ A}. For digraph D, a directed path and a directed circuit which contain every vertex of D is called a Hamiltonian path and Hamiltonian circuit...

    pdf5 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 283 | Lượt tải: 0

  • Modeling user’s interests, similarity and trustworthiness based on vectors of entries in social networksModeling user’s interests, similarity and trustworthiness based on vectors of entries in social networks

    Abstract The purpose of this paper is first to present vectorial representations of user’s entries and interests in topics in social networks. Based on such vectorization of short texts, we propose three interest measures of users. And then we investigate the relationships among interest degrees, similarity and trustworthiness of users based o...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 279 | Lượt tải: 0

  • On an identity involving integer partitions sequencesOn an identity involving integer partitions sequences

    Abstract In this short note we provide an q-series identity. By the use of the new concept of integer partition sequences, we give a bijective proof of this identity based in a famous Euler partition identity involving partitions into distinct parts and partitions in odd parts.

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  • A new proof of baer-dedekind theoremA new proof of baer-dedekind theorem

    Abstract In this paper we will give a new proof of the Baer-Dedekind theorem which classifies the groups in which each subgroup is normal, using the fact that these are torsion nilpotent groups whose class is less than or equal to 2.

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  • Application of 1H DOSY NMR in Measurement of Polystyrene Molecular WeightsApplication of 1H DOSY NMR in Measurement of Polystyrene Molecular Weights

    Abstract: In this work, we studied the applicability of diffusion ordered nuclear magnetic resonance spectroscopy (DOSY NMR) as an alternative method in determination of polystyrene molecular weight. DOSY NMR spectroscopy allows measuring the diffusion coefficient of molecule which directly depend on hydrodynamic radius and so on, average molar ...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 384 | Lượt tải: 0

  • Tripolar fuzzy interior ideals of semiringsTripolar fuzzy interior ideals of semirings

    Abstract In this paper, we introduce the notion of tripolar fuzzy set to be able to deal with tripolar information as a generalization of fuzzy set, bipolar fuzzy set and intuitionistic fuzzy set. The tripolar fuzzy set representation is very useful in discriminating relevant elements, irrelevant elements and contrary elements.We also introduce...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 303 | Lượt tải: 0

  • A new algorithm for computing a root of transcendental equations using series expansionA new algorithm for computing a root of transcendental equations using series expansion

    Abstract In this paper, we discuss a new algorithm to find a non-zero real root of the transcendental equations using series expansion. This proposed method is based on the inverse series expansion, which gives a good approximate root than some other existing methods. The implementation of this algorithm is presented in Matlab and Maple. Sample...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 15/07/2021 | Lượt xem: 292 | Lượt tải: 0