A New Linear Printed Vivaldi Antenna Array with Low Side Lobe Level and High Gain for the Band 3.5 GHz

This paper proposes a new design of low sidelobe level (SLL) and high gain linear printed Vivaldi antenna array. The array composes of two parts, which are a linear Vivaldi antenna array and a back reflector. The array consists of 10 single Vivaldi antennas and a series-fed network, those are based on Roger RO4003C substrate (ε = 3.55) with the dimension of 140 x 450 x 1.524 mm3. A new Bat algorithm with the amplitude-only control technique has been applied to optimize the output coefficients of the series-fed network for gaining a low SLL. The simulation results indicate that the proposed antenna provides a low SLL of -29.2 dB in E-plane with a high gain of 16.5 dBi at the frequency of 3500 MHz. A prototype of the proposed antenna array has been fabricated. The measured data has a good agreement with the simulated data

Assessing Student’s Acceptance of Digital Transformation in Business and Management Universities in Vietnam

In recent years, the trend of digital transformation in education has increased significantly. A series of policies to promote the digital transformation of education have been issued, gradually completing the legal corridor such as the regulations on applying information technology, information in management, organization of online training, the use of the entire industry database system. Therefore, this article is the result of a more comprehensive research project and aims to analyze the digital transformation acceptance of college students in Economic - Business Universities in the North of Vietnam. The Unified Theory of Acceptance and Use of Technology (UTAUT) and independent variable Perceived Security (PS) have been combined together in order to support the survey. The data was analyzed using the method of multiple regression. These findings shed the light on the digital transformation acceptance level of students with the positive link of Performance Expectancy (PE), Social Influence (SI), Perceived Security (PS) and Facilitating Conditions (FC) on Behavioral Intention of digital transformation and its Use Behavior. Moreover, the study also has the contribution to provide orientations and solutions that will be proposed to approach the trend encouraging the application of digital transformation into higher education specifically in the business field. Keywords: UTAUT, digital transformation, perceived security, higher education DOI: 10.7176/JESD/12-8-02 Publication date: April 30th 202

Dynamic Analysis of Mindlin Plates Resting on a Viscoelastic Foundation Subjected to Moving Loads During Abrupt Braking using Moving Element Method

The paper proposes a new computational approach using the moving element method (MEM) for simulating the dynamic responses of Mindlin plate resting on a viscoelastic foundation subjected to moving loads during abrupt braking. In this approach, the governing equations as well as the plate element mass, damping and stiffness matrices are formulated in a convected coordinate in which the origin is attached to the applied point of the moving load. Thus, the proposed method simply treats the moving loads as ‘stationary’ at the nodes of the plate to avoid updating the locations of moving loads due to the change of the contact points on the plate. The interaction between the moving load and the plate during abrupt braking is accounted for through the vertical force and tangential wheel-pavement friction force. The effects of wheel sliding, load deceleration magnitude, friction coefficient, and plate thickness on the dynamic responses of plate are investigated

Une étude de cas pour l'étiquetage morpho-syntaxique de textes vietnamiens

Colloque avec actes sans comité de lecture. nationale.National audienceDans cet article, nous discutons de la construction des jeux d'étiquettes pour l'analyse morpho-syntaxique du vietnamien, en prenant en compte les spécificités linguistiques de cette langue. Cette construction est inspirée du modèle MULTEXT(*) dans le but de s'orienter vers les applications multilingues ainsi que la réutilisabilité des jeux d'étiquettes. Nous allons finalement décrire une expérimentation sur l'étiquetage lexical des textes vietnamiens en utilisant QTAG (Mason et Tufis, 1998), un étiqueteur probabiliste indépendant des langues. || This paper discusses part of speech (POS) tagset construction for Vietnamese by considering linguistic specificities of this language. We take into account the schema as defined in the MULTEXT(*) model, so as to account for possible multilingual applicat

Developing Tools and Building Linguistic Resources for Vietnamese Morpho-Syntactic Processing

Colloque avec actes et comité de lecture. internationale.International audienceVietnamese is spoken by about 80 millions people around the world, yet very few concrete works on this language have been noticed in Natural Language Processing (NLP) until now. The fundamental problems in automatic analysis of Vietnamese, such as part-of speech (POS) tagging, parsing, etc. are extremely difficult due to the lack of formal linguistic knowledge on one hand, and the specificities of isolating languages on the other hand. In this paper, we present our efforts to develop a set of tools permitting the construction and management of language resources for Vietnamese in a normalized framework, whose aim is to be largely distributed and usable for research purposes in NLP. We first define a tagset by constructing Vietnamese morpho-syntactic descriptors that fit in a model compatible with MULTEXT, so as to account for possible multilingual applications as well as the reusability of defined tagsets. We then implement a system undertaking the tasks of word segmentation and POS tagging. Our system ensures a representation format of linguistic resources that is currently considered in the framework of ISO/TC 37/SC 4. Finally we attempt to construct a formal syntactic description of nominal groups using the Tree Adjoining Grammar (TAG) formalism

Lexical descriptions for Vietnamese language processing

Colloque avec actes et comité de lecture. internationale.International audienceOnly very recently have Vietnamese re-searchers begun to be involved in the do-main of Natural Language Processing. As there does not exist any published work in formal linguistics or any recognizable standard for Vietnamese word categories, the fundamental works in Vietnamese text analysis such as part-of-speech tagging, parsing, etc. are very difficult tasks for computer scientists. All necessary linguistic resources have to be built from scratch, and until now almost no re-sources are shared in public research. The aim of our project is to build a common linguistic database that is freely and easily exploitable for the automatic processing of Vietnamese. In this paper, we propose an extensible set of Vietnamese syntactic descriptions that can be used for tagset definition and corpus annotation. These descriptors are established in such a way to be a reference set proposal for Vietnamese in the context of ISO subcommit-tee TC37/SC4 (Language Resource Management)

Building a Large Syntactically-Annotated Corpus of Vietnamese

Held in conjunction with ACL-IJCNLP 2009International audienceTreebank is an important resource for both research and application of natural language processing. For Vietnamese, we still lack such kind of corpora. This paper presents up-to-date results of a project for Vietnamese treebank construction. Since Vietnamese is an isolating language and has no word delimiter, there are many ambiguities in sentence analysis. We systematically applied a lot of linguistic techniques to handle such ambiguities. Annotators are supported by automatic labeling tools and a tree-editor tool. Raw texts are extracted from Tuoi Tre (Youth), an online Vietnamese daily newspaper. The current annotation agreement is around 90 percent

Word segmentation of Vietnamese texts: a comparison of approaches

International audienceWe present in this paper a comparison between three segmentation systems for the Vietnamese language. Indeed, the majority of Vietnamese words is built by semantic composition from about 7,000 syllables, that also have a meaning as isolated words. So the identification of word boundaries in a text is not a simple task, and ambiguities often appear. Beyond the presentation of the tested systems, we also propose a standard definition for word segmentation in Vietnamese, and introduce a reference corpus developed for the purpose of evaluating such a task. The results observed confirm that it can be relatively well treated by automatic means, although a solution needs to be found to take into account out-of-vocabulary words

Enabling Intelligent Traffic Steering in A Hierarchical Open Radio Access Network

peer reviewedIn this paper, we aim to enable an intelligent traffic (TS) steering application in the open radio access network (O-RAN) by jointly optimizing the flow-split distribution, congestion control and scheduling (i.e. so-called JFCS). To do so, we develop a multi-layer optimization framework based on network utility maximization and stochastic optimization methods. The proposed algorithm provides fast convergence, long-term utility-optimality and significantly low latency compared to state-of-the-art RAN approaches. In particular, our main contributions are as follows: i) we propose the novel JFCS framework to efficiently and adaptively route traffic to indented users in appropriate radio units, and ii) we develop low-complexity algorithms to effectively solve the JFCS problem in different time scales, enabling a closed-loop control of the TS in the O-RAN context. The insights presented in this work will pave the way for O-RAN that are completely automated, offering improved control and flexibility