Dalat University Journal of Science / Tạp chí khoa học Đại học Đà Lạt
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    543 research outputs found

    MONOMIAL IDEALS FROM A SEMIRING PERSPECTIVE

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    We formulate the theory of monomial ideals of a ring of polynomials with coefficients in a field through the theory of semirings. In particular, we focus on the theory of integrally closed monomial ideals. We prove that there exist isomorphisms of lattice-ordered semirings between the semiring of antichains of Nn equipped with the product order (of its usual order), and the semiring of monomial ideals. In the same way, we prove that there is an isomorphism between the semiring of integrally closed monomial ideals and the family of vertex sets of Nn equipped with the product order. These isomorphisms are independent of the choice of a base field for the polynomial ring

    REMARKS ON LIPSCHITZ GEOMETRY OF GLOBALLY CONIC SINGULAR MANIFOLDS

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    We study metric properties of manifolds with conic singularities and present a natural interplay between metrically conic and metrically asymptotically conic behavior. As a consequence, we prove that a singular sub-manifold is Lipschitz normally embedded (i.e., its inner and outer metric structures are equivalent) in an ambient singular manifold whenever the singularities are conic and the ends of the manifold are asymptotically conic, which answers positively a question of Costa et al. (2024c)

    ANTIMICROBIAL ACTIVITY OF PIPER BETLE L. LEAF EXTRACT-REDUCED SILVER NANOPARTICLES

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    Spherical silver nanoparticles were produced utilizing Piper betle L. extract as a natural reducing and stabilizing agent. The concentration of AgNO₃ and the pH were tuned for consistent particle production. The silver nanoparticles were analyzed by scanning electron microscopy, UV–Vis absorption spectroscopy, and energy-dispersive X-ray spectroscopy. Antibacterial activity was evaluated against Citrobacter freundii (NCTC 43864) and Helicobacter pylori, and antifungal activity was evaluated against three fungal strains: Aspergillus fumigatus ATCC 204304, Aspergillus brasiliensis, and Candida albicans ATCC 10231. Ampicillin and amoxicillin served as positive controls, while distilled water (H₂O) functioned as the negative control. The produced silver nanoparticles had an average diameter of 20 ± 1.8 nm. At a concentration of 100 µg/mL, they exhibited superior antibacterial and antifungal efficacy compared to conventional antibiotics or Piper betle L. extract alone. The results indicate that green-synthesized silver nanoparticles have potential as a sustainable and biocompatible alternative for combating bacterial and fungal diseases

    TỶ LỆ LÃI SUẤT TRONG HỢP ĐỒNG VAY TIỀN THEO QUY ĐỊNH CỦA PHÁP LUẬT DÂN SỰ VIỆT NAM QUA CÁC THỜI KỲ TRONG MỐI LIÊN HỆ VỚI PHÁP LUẬT TÍN DỤNG

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    Interest rates are a financial tool to ensure the rights of lenders in loan contracts. Accordingly, the borrower is obliged to pay interest if so agreed or provided by law. Through the amendments of the Civil Code, interest rates are an item that has had many changes compared to other provisions in loan agreements. However, the interest rates prescribed in the current Civil Code still cause different interpretations, especially in relation to credit laws. This leads to inconsistent application of the law, especially when dealing with credit contract disputes. Therefore, based on the study of interest rate regulations on loan contracts under the laws of Vietnam over time, we analyze some problems about interest rates and credit law under the current Civil Code and make some specific recommendations to solve the problems.Lãi suất là một công cụ tài chính nhằm đảm bảo quyền lợi của bên cho vay trong các hợp đồng vay tiền; theo đó, bên vay có nghĩa vụ trả lãi nếu có thỏa thuận hoặc pháp luật có quy định. Qua các lần sửa đổi Bộ luật Dân sự, lãi suất là một nội dung có nhiều sự thay đổi so với các quy định khác trong chế định hợp đồng vay tài sản. Tuy nhiên, tỷ lệ lãi suất được quy định trong Bộ luật Dân sự hiện hành vẫn còn gây ra nhiều cách hiểu khác nhau, đặc biệt là trong mối liên hệ với pháp luật tín dụng. Điều này dẫn đến việc áp dụng pháp luật không thống nhất, đặc biệt là khi giải quyết các tranh chấp về hợp đồng tín dụng. Vì vậy, trong phạm vi bài viết, trên cơ sở nghiên cứu các quy định về tỷ lệ lãi suấttrong hợp đồng vay tiền theo quy định của pháp luật Việt Nam qua các thời kỳ, chúng tôi phân tích một số vướng mắc về tỷ lệ lãi suất theo quy định của Bộ luật Dân sự Việt Nam hiện hành trong mối liên hệ với pháp luật tín dụng và đưa ra một số kiến nghị cụ thể giải quyết vấn đề này.

    HIỆU LỰC VÀ ĐỘ TIN CẬY CỦA THANG ĐO CÁC KIỂU ỨNG PHÓ VỚI BẮT NẠT TRỰC TUYẾN DÀNH CHO SINH VIÊN

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    Based on the self-report coping scale (22 items) of Kochenderfer-Ladd and Skinner (2002), we have established and tested the validity and reliability of a Vietnamese version of the cyberbullying coping styles scale for students. The sample is 162 students from Hue University. Item discrimination analysis, item analysis, exploratory factor analysis, confirmatory factor analysis, and internal consistency reliability analysis were performed to assess the reliability and validity of the scale. The results show that the Vietnamese version of the cyberbullying coping styles scale had 21 items and 5 dimensions (problem solving, cognitive distance, looking for social support, externalization, and internalization). Analysis results showed that the Vietnamese version of the cyberbullying coping styles scale has good reliability and validity.Dựa theo thang đo tự báo cáo về ứng phó (22 mẫu) của Kochenderfer-Ladd và Skinner (2002), chúng tôi đã thiết lập và kiểm tra tính độ tin cậy và hiệu lực của phiên bản Tiếng Việt của thang đo các kiểu ứng phó với bắt nạt trực tuyến dành cho sinh viên. Mẫu nghiên cứu là 162 sinh viên đến từ Đại học Huế. Phân tích độ phân biệt, phân tích item, phân tích nhân tố khám phá, phân tích nhân tố xác nhận, phân tích độ tin cậy được thực hiện để đánh giá độ tin cậy và hiệu lực thang đo. Kết quả cho thấy phiên bản tiếng Việt của thang đo các kiểu ứng phó với bắt nạt trực tuyến có 21 mẫu và 5 tiểu thang đo (giải quyết vấn đề; Khoảng cách nhận thức; tìm kiếm sự hỗ trợ xã hội; Ngoại hóa và nội địa hóa). Kết quả phân tích cho thấy, phiên bản tiếng Việt của thang đo các kiểu ứng phó với bắt nạt trực tuyến có độ tin cậy và hiệu lực tốt

    SUPERVISOR LEADERSHIP STYLE AND ORGANIZATIONAL CITIZENSHIP BEHAVIOR IN THE HOSPITALITY INDUSTRY: THE MODERATING ROLE OF TRAIT GRATITUDE

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    The hospitality industry heavily relies on the performance of frontline employees, and organizational citizenship behavior (OCB) plays a crucial role in enhancing service quality and customer satisfaction. This study investigates the impact of supervisor transformational leadership and servant leadership on three dimensions of OCB among frontline employees in the hospitality industry in Da Nang, Vietnam. Additionally, the moderating role of trait gratitude is examined. A theoretical model grounded in social exchange theory, broaden-and-build theory, and experimental studies is developed and empirically tested using data collected from 346 frontline employees of 3-star (or higher) hotels in Da Nang. The findings reveal that both supervisor transformational leadership and servant leadership significantly impact organizational citizenship behavior toward the organization (OCBO) and toward customers (OCBC), with supervisor servant leadership exhibiting a stronger influence. However, the hypothesized relationships between supervisor transformational leadership, supervisor servant leadership, and organizational citizenship behavior toward individuals (OCBI) are found to be nonsignificant. Moreover, trait gratitude moderates the relationship between supervisor transformational leadership and OCBO, as well as the relationship between supervisor servant leadership and both OCBO and OCBC. This research contributes to the understanding the effect of leadership style on OCB dimensions in the hotel industry and highlights the role of personality traits, such as trait gratitude, in shaping OCB

    THE INTERFACE POSITION OF A BOSE-EINSTEIN CONDENSATE MIXTURE RESTRICTED BY A HARD WALL IN THE DOUBLE-PARABOLA APPROXIMATION

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    In this study, we determine the interface position of a binary Bose-Einstein condensate mixture in the prewetting phase, confined by a hard wall, at absolute zero temperature. An approximate analytical result is obtained by employing the double-parabola approximation (DPA) to the quartic potential energy density within the Gross-Pitaevskii (GP) theory. The interface position depends on the control parameter and the chemical potential ratio. Our analytical result shows good agreement with numerical results, which indicates that the DPA is a reliable method. This study provides insights for experiments focused on observing the wetting transition of gases in the Bose-Einstein condensate phase

    VĂN HÓA GIAO TIẾP CỦA NGƯỜI ÊĐÊ QUA TỪ XƯNG HÔ TRONG SỬ THI Y’KHING JU

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    In communication, the way of addressing shows the attitudes and affection of the speakers and reflects the positions, perceptions, social and cultural relationships, and language abilities of the individuals in the community. To clarify the characteristics of the Ede people’s communication culture, the article analyzes the communication characteristics of the Ede people through relationships, methods, and rituals of addressing in the Y’Khing Ju epic.Trong giao tiếp, lối xưng hô không chỉ thể hiện thái độ, tình cảm của các chủ thể trong giao tiếp mà còn thể hiện vị trí, nhận thức, mối quan hệ xã hội, văn hóa và khả năng ngôn ngữ của cá nhân, cộng đồng. Để góp phần làm rõ thêm đặc trưng văn hóa giao tiếp của người Êđê, bài viết phân tích đặc trưng giao tiếp của người Êđê qua các mối quan hệ, cách thức và các nghi thức xưng hô qua sử thi Y Khing Ju

    MINING CONCISE REPRESENTATIONS OF FREQUENT HIGH-UTILITY OCCUPANCY ITEMSETS USING GENERATOR PATTERNS

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    A current trend in data mining is the discovery of frequent high-utility occupancy itemsets (FHUOIs) in quantitative databases. These itemsets capture user preferences and significantly contribute to transaction utility, making them valuable for real-world applications. However, analyzing the result set of all FHUOIs is complicated by its often-massive size, especially in large or dense datasets with low minimum-utility occupancy thresholds. To address this challenge, this paper introduces GFHUOI-Miner, a novel algorithm designed to efficiently extract a smaller set of all generators of FHUOIs (GFHUOIs). The algorithm reduces the search space by early elimination of non-generator FHUOI branches using a novel weak lower bound on the utility occupancy function, named pFEwlb, along with two efficient pruning strategies based on pFEwlb. Additionally, GFHUOI-Miner incorporates an optimization technique to minimize computationally expensive inclusive relationship checks among itemsets. Experimental results demonstrate that the proposed algorithm outperforms the baseline in terms of runtime, memory usage, and scalability for discovering all GFHUOIs

    INVERSE VARIATIONAL INEQUALITIES AND SECOND-ORDER DYNAMICAL SYSTEMS

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    We consider the inverse variational inequality problem in finite-dimensional space and study its associated second-order dynamical system. In particular, we propose a second-order dynamical system whose trajectory converges exponentially to the solution of the inverse variational inequality problem under the Lipschitz continuous and strongly monotone condition

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    Dalat University Journal of Science / Tạp chí khoa học Đại học Đà Lạt is based in Vietnam
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