Hasil untuk "General works"

Shengbo Jin, Weigang Zhu, Shaohua Jiang

Monitoring and management of power line corridors are essential for ensuring the safe and reliable operation of power transmission systems. Traditional manual inspection methods are not only inefficient but also pose significant safety risks, while certain existing automated approaches suffer from limited effectiveness in complex terrains or in the presence of discontinuities in point cloud data, resulting in insufficient accuracy in power line extraction and frequent reconstruction failures. To address these challenges, this study proposes a novel power line reconstruction method termed Weighted Multi-feature & Multi-plane Projection Geometric Fusion (WM-MPGF). The proposed method comprises two sequential stages: Weighted Multi-Feature SVM (WMF-SVM) and Multi-plane Projection and Geometric Joint Reconstruction (MPG-Recon). Specifically, WMF-SVM introduces a weighted multi-feature support vector machine framework that integrates elevation data derived from the Digital Elevation Model (DEM) with spatial features extracted via Principal Component Analysis (PCA), while optimizing feature weights through the entropy weight method to enhance the accuracy of power line identification. Subsequently, MPG-Recon performs geometric analysis to construct directional projection planes and applies the Hough transform to project power line points and determine their dominant orientations on the XOY and YOZ planes. The Davies-Bouldin index is employed to determine the optimal number of clusters, thereby enabling accurate estimation of the number of power lines. By integrating the K-means clustering algorithm, the method achieves effective separation of multiple power lines and ensures high-precision fitting of individual conductors. Experimental results indicate that the proposed approach achieves average fitting errors of 5.41 cm on the XOY plane and 5.68 cm in the vertical direction, successfully capturing the three-dimensional structural characteristics of power lines. The method constructs a robust 3D model and provides critical technical support for advanced applications in power line corridor monitoring and maintenance.

M. Sabido, V. Sierra

In this work, we study a cosmological model driven by Generalized ModMax nonlinear electrodynamics. We find that, with an appropriate choice of the theory's parameters, the universe's initial singularity can be avoided. Moreover, we also find that this model has an inflationary epoch that is consistent with the current values for $N$, $n_s$ and $r$. Therefore, using Generalized ModMax, we can construct a non singular Universe with an inflationary epoch.

Nicolas Lema Habash, Giovana Suárez Ortiz

Proponemos un estudio del filme Hojas de otoño (2023) de Aki Kaurismäki en términos de una reflexión cinemática acerca de cómo es posible perseverar afectivamente en el mundo contemporáneo dominado por la lógica de la extracción de plusvalía por medio del trabajo asalariado. Luego de una contextualización de este filme dentro la obra de Kaurismäki, donde destaca una reflexión sobre el mundo laboral contemporáneo, argumentamos que en su cine se da una revalorización del amor romántico. Aunque ciertamente escenificado por motivos heterosexuales tradicionales, se trata de una forma de amor romántico que implica un intento rupturista por encontrar una suerte de refugio afectivo en medio de una estructura de la sociedad y el mundo que tiende a la aniquilación de la vitalidad. De ahí que propongamos la idea de un “conservadurismo paradojal” en los motivos del amor romántico en Kaurismäki: paradojal, puesto que las formas tradicionales del amor con las cuales piensa Hojas de otoño implican formas de potenciamiento afectivo y no simplemente la mantención del statu quo. 

Simon Welker, Tal Peer, Timo Gerkmann

The task of Mel vocoding, i.e., the inversion of a Mel magnitude spectrogram to an audio waveform, is still a key component in many text-to-speech (TTS) systems today. Based on generative flow matching, our prior work on generative STFT phase retrieval (DiffPhase), and the pseudoinverse operator of the Mel filterbank, we develop MelFlow, a streaming-capable generative Mel vocoder for speech sampled at 16 kHz with an algorithmic latency of only 32 ms and a total latency of 48 ms. We show real-time streaming capability at this latency not only in theory, but in practice on a consumer laptop GPU. Furthermore, we show that our model achieves substantially better PESQ and SI-SDR values compared to well-established not streaming-capable baselines for Mel vocoding including HiFi-GAN.

Nicol Viljoen

This article focuses on che raised. fourth or Lydian scale degree of the scale in Chopin's mazurkas from the viewpoint of the stylised mazurka's fusion of folkloric elements and nineteenth-century tonal language. A brief exposition of the functions of the raised fourth and its integradon into the tonal structures of the mazurkas is given. An investigation of the raised fourth in three selected mazurkas· reveals a significant expansion of its role musi~al meaning, function and effect, As an authentic, modal, structural, motivic and form-generating device, it is in terms of integral co tonal elaboration, development, unification, colouration and contrast.

Md. Touhidul Islam, Md. Mahadi Hasan, Md. Redwanuzzaman et al.

This research paper explores the practices of artificial intelligence (AI) and its impact on improving businesses in Bangladesh through the review of existing literature and primary data analysis. Additionally, a conceptual analysis has been conducted on key AI concepts and their potential applications in the Bangladeshi business context. The study's objectives include providing a detailed understanding of specific AI technologies, measuring the benefits of AI, assessing the challenges faced by the industry in implementing AI and finding probable solutions to overcome these challenges. Data were collected from 120 respondents from 10 types of businesses in Bangladesh and analyzed using MS Excel and SPSS (V. 25). According to the results, using AI in enterprises may have a significant positive impact on efficiency, decision-making, production, cost, fraud detection, and supply chain optimization. However, obstacles to AI deployment include a lack of qualified personnel, poor data quality, money, infrastructure, and legal frameworks. Businesses should raise employee understanding of AI, look for diversified financing and qualified personnel, work with the government on infrastructure support and legislation, address concerns about job displacement through training, and encourage employee acceptance of change in order to overcome these challenges. Businesses in Bangladesh may improve operations and competitiveness by using these techniques. Business executives, decision-makers, and academics interested in maximizing the potential of AI and enhancing business outcomes in Bangladesh might learn from this study.

Agne Brandisauskiene, Loreta Buksnyte-Marmiene, Jurate Cesnaviciene et al.

This study aimed to investigate the role of teacher support and equity in the relationship between teacher’s autonomy-promoting behavior and students’ learning strategies. The approach examines the direct relationship between teacher’s autonomy-supportive behavior and students’ learning strategies and via perceived teacher support. It also discusses the effect of perceived equity for the relationship between autonomy-supportive behavior in teacher’s and teacher support. Data were obtained from 24 secondary schools in nine Lithuanian municipalities with poor socioeconomic level contexts ( N  = 632 pupils). The findings revealed that teacher’s autonomy-supportive behavior is directly associated to student’s greater use of learning strategies, as well as through a mediator—student’s perceptions of teacher support. The association between teacher’s autonomy-supportive behavior and teacher support is moderated by students’ perceived equity so that the positive relationship is stronger for students with a higher than with a lower perceived equity. This study adds to the understanding of the importance of teacher behavior for students’ learning by concentrating on equity, which is especially essential for students from low-income families. Teachers may foster equity by providing more possibilities for autonomy for all students, creating a supportive classroom environment and inviting students to be active participants in the learning process.

Erhan Sevinç

The purpose of this study is a systematic review examining the causes of mathematics anxiety experienced by primary school pupils and their interactions with diverse variables. In the study, a total of 20 investigations, including four theses and 16 articles, were conducted between 2010 and 2022. The works carried out, the themes of publication year, purpose, method or design, sample level, number of samples, data collection tools, analysis methodologies, findings, and suggestions are covered. According to the reviews, it was discovered that the research conducted with the quantitative method was prominent. In the studies studied, the association between the mathematical self-efficacy of students, instructors, and parents and the mathematics anxiety they experienced was observed. In the research investigated, it was discovered that various variables were examined, and similarly, many findings were produced. In general, there is a commonality in the findings of investigations on the same subject. In the findings, most problems deriving from the student-teacher connection were discovered. In addition, it was noted that teachers and their parents suffered from math anxiety, and their anxiety levels differed according to numerous variables. According to the results of the research studied, various proposals were provided. Since the causes of anxiety are complex, suggestions are provided for the school system and teacher training institutions.

Jorge Pinochet

Einstein's general relativity is the best available theory of gravity. In recent years, spectacular proofs of Einstein's theory have been conducted, which have aroused interest that goes far beyond the narrow circle of specialists. The aim of this work is to offer an elementary introduction to general relativity. In this first part, we introduce the geometric concepts that constitute the basis of Einstein's theory. In the second part we will use these concepts to explore the curved spacetime geometry of general relativity.

رامین گلشائی

این مقاله ترجمة کتاب کاربردشناسی واژگانی و نظریة ذهن: فراگیری پیوندها، نوشتة سندرین زوفری و ترجمۀ محمدحسن ترابی، شهره صادقی و الهه کمری را بررسی و نقد می‌کند. نظریة ذهن یکی از مهم‌ترین حوزه‌های مطالعاتی در روان‌شناسی شناختی است که توانایی افراد در درک حالات ذهنی خود و دیگران را بررسی می‌کند. این کتاب با رویکردی میان‌رشته‌ای سعی می‌کند جوانب گوناگون رابطة نظریة ذهن و کاربردشناسی زبان را بکاود. در این مقاله، کتاب از منظر ساختاری و شکلی و نیز محتوایی بررسی شده است. از نقاط قوت کتاب، می‌توان به ترجمة بسیار روان و خوش‌خوان، دقت قابل‌قبول ترجمه، پانویسی اصطلاحات تخصصی و اسامی خاص، واژه‌نامة دوزبانه، و رعایت اصول ویرایشی اشاره کرد. از کاستی‌های کتاب نیز می‌توان یک‌دست‌نبودن برخی معادل‌های به‌کاررفته در کتاب، ضعف و کم‌دقتی در صحافی، و برخی خطاهای املایی و دستوری را برشمرد. درمجموع، کلیت کتاب به‌دلیل پرداختن به موضوعی بدیع و برخورداری از ترجمه‌ای خوب و روان مثبت ارزیابی می‌شود و می‌تواند منبع ارزش‌مندی برای پژوهش‌گران فارسی‌زبان به‌منظور تحقیقات میان‌رشته‌ای در حوزه‌های زبان و نظریة ذهن باشد.

Yang Ma, Yantao Cui, Huagao Tan et al.

Abstract Accompanying its rapid urban development, prevalent urban flooding incidents have been occurring in China in the past two decades with increasing frequency. Through a comparison with generally accepted urban flooding management practices, we (the authors) identified that a lack of surface water runoff management considerations (i.e., missing a major drainage system in urban stormwater system) and inadequate local mitigation are the primary causes of urban flooding problems in China, which in turn is rooted in the planning stage of a city's development. Following identification of the primary causes for the problems, we propose the development of master drainage plans (MDPs) for the concerned cities or regions as the first effective step to mitigate the serious urban flooding problems facing many cities today. An MDP would provide necessary elements to develop a major drainage system for the city's stormwater system and allow for an accurate calculation of parameters necessary for installation of adequate local mitigations. Lessons learned in this study should be useful for China's administrative agencies and professionals while they try to find solutions to their urban flooding problems and beneficial to other nations facing rapid urban development in the future or with existing urban flooding threats.

Peng Li, Yuanfeng Chen, Kang Yang et al.

To achieve the national carbon-peak and carbon-neutral strategic development goals, it is necessary to build power systems dominated by renewable and sustainable energy. The future power system with a high proportion of renewable and sustainable energy is required to have large-scale, low-cost, flexible, and adjustable resources. To this end, this article aggregates user-side distributed energy storage and electric vehicles into a virtual power plant, considering the uncertainty of wind power fluctuations and the uncertainty of electric vehicle charging and discharging to establish a day-ahead and intra-day peak regulation model for combined peak regulation of virtual and thermal power plants. The bounding algorithm seeks the optimal strategy for the two-stage model of joint peak regulation and obtains the day-ahead and intra-day two-stage optimal peak regulation strategy. The simulation example shows that the virtual power plant and its day-ahead and intra-day optimal peak regulation strategy can reduce the peak regulation cost of the power system, as compared with the deep peak regulation of thermal power plants with a special supporting energy storage power station. This work provides a global perspective for virtual power plants to participate in the formulation of power system peak regulation rules.

Xiangci Li, Biswadip Mandal, Jessica Ouyang

Academic research is an exploratory activity to discover new solutions to problems. By this nature, academic research works perform literature reviews to distinguish their novelties from prior work. In natural language processing, this literature review is usually conducted under the "Related Work" section. The task of related work generation aims to automatically generate the related work section given the rest of the research paper and a list of papers to cite. Prior work on this task has focused on the sentence as the basic unit of generation, neglecting the fact that related work sections consist of variable length text fragments derived from different information sources. As a first step toward a linguistically-motivated related work generation framework, we present a Citation Oriented Related Work Annotation (CORWA) dataset that labels different types of citation text fragments from different information sources. We train a strong baseline model that automatically tags the CORWA labels on massive unlabeled related work section texts. We further suggest a novel framework for human-in-the-loop, iterative, abstractive related work generation.

Felipe Matti

Guiyu Cao, Kun Xu, Liang Pan et al.

In this paper, a high-order gas-kinetic scheme in general curvilinear coordinate (HGKS-cur) is developed for the numerical simulation of compressible turbulence. Based on the coordinate transformation, the Bhatnagar-Gross-Krook (BGK) equation is transformed from physical space to computational space. To deal with the general mesh given by discretized points, the geometrical metrics need to be constructed by the dimension-by-dimension Lagrangian interpolation. The multidimensional weighted essentially non-oscillatory (WENO) reconstruction is adopted in the computational domain for spatial accuracy, where the reconstructed variables are the cell averaged Jacobian and the Jacobian-weighted conservative variables. The two-stage fourth-order method, which was developed for spatial-temporal coupled flow solvers, is used for temporal discretization. The numerical examples for inviscid and laminar flows validate the accuracy and geometrical conservation law of HGKS-cur. As a direct application, HGKS-cur is implemented for the implicit large eddy simulation (iLES) in compressible wall-bounded turbulent flows, including the compressible turbulent channel flow and compressible turbulent flow over periodic hills. The iLES results with HGKS-cur are in good agreement with the refereed spectral methods and high-order finite volume methods. The performance of HGKS-cur demonstrates its capability as a powerful tool for the numerical simulation of compressible wall-bounded turbulent flows and massively separated flows.

Karan Fernandes, Susovan Maity, Tapas K. Das

As of now, all analogue gravity models available in the literature deal with the emergence of an acoustic geometry through linear perturbations of transonic fluids only. It has never been investigated whether the analogue gravity phenomena is solely a consequence of linear perturbations, or rather a generic property of arbitrary perturbations of inhomogeneous, inviscid and irrotational fluids. In the present work, for the first time in the literature, we demonstrate that acoustic spacetimes may be formed through higher order non-linear perturbations, and thus establish that analogue gravity phenomena is rather more general than what was thought before. We consider spherically accreting astrophysical systems as a natural classical analogue gravity model, and develop a formalism to investigate non-linear perturbations of such accretion flows to arbitrary order. Our iterative approach involves a coupled set of equations for the mass accretion rate and the density of the fluid. In particular, we demonstrate that the wave equation for the mass accretion rate involves an acoustic metric which can be perturbatively constructed to all orders. We numerically solve the coupled equations about the leading transonic Bondi flow solution. This analysis uses boundary conditions set to the original unperturbed values, with the time dependence of the mass accretion rate perturbation taken to be exponentially damped. The perturbed solutions indicate that second order and higher perturbations of the metric generically cause the original acoustic horizon to oscillate and change in size. We explain this phenomenon in detail and its implications on non-linear perturbations of accretion flows in general.

Saad F. Abbas Al - Mahmoud, Eiveet Sh. Mikho Qelo, Delman Kh. Ramadhan Al-Sharvany

تواجه المنظمات في الآونة الاخيرة عدداً من التغيرات والتطورات العالمية في بيئة الأعمال، وذلك نتيجة للتغيرات السياسية والاقتصادية والاجتماعية والتكنولوجية والقانونية التي تؤثر على الصورة الذهنية للمنظمة، حيث أصبح الابداع هدفاً تنظيمياً لجميع المنظمات التي تتنافس بشراسة في عالم تزداد فيه حدة العولمة ، إذ ينظر المديرون إلى الابداع ليس فقط كأسلوب عمل جديد، ولكن كوسيلة حقيقية تستند المنظمات عليها للبقاء والاستمرار على المدى الطويل بجانب استكشاف واستغلال المجالات السوقية غير المتنازع عليها لأن التنافس في الاسواق المكتظة ليست وسيلة للحفاظ على الحصة السوقية للمنظمة. كما أصبح تكوين الصورة الذهنية الجيدة هدفاً أساسياً تسعى إليه العديد من المنظمات التي تنشد النجاح حيث هناك وعى لدى المنظمات بأهمية دراسة الصورة الذهنية التي تتكون في أذهان الأفراد لكي تكون قادرة على بناء الخطط والاستراتيجيات والمتصلة بتحسين الانطباعات والمعارف الذهنية للأفراد وبالتالي تكوين بيئة ملائمة لتحقيق الابداع في كافة نشاطات المنظمة. وتهدف الدراسة الحالية إلى استطلاع آراء عينة من المديرين ورؤساء الأقسام في المنظمات الانشائية ضمن مدينة دهوك والبالغ عددهم (89) فرداً تجاه متغيرات الدراسة عن طريق استمارة الاستبيان والتي تم تحليل بيانتها باعتماد الحزمة الإحصائية للعلوم الاجتماعية (SPSS-V25). وقد اسفرت نتائج البحث عن أن الصورة الذهنية للمنظمات المبحوثة تكتسب معظم خصائصها من القيمة المبدعة وأبعادها، وأنه كلما تميزت المنظمات المبحوثة في القيمة المبدعة لمنتجاتها فإن لذلك تأثيراً ايجابياً في تحسين صورتها الذهنية لدى الزبائن. كما قدم البحث عدداً من التوصيات منها أن تتبنى المنظمات المبحوثة ثقافة الإبداع في تعاملها مع العاملين وذلك بتمكينهم من العمل باستقلالية وتطبيق أفكارهم الخلاقة والمبدعة والتي تنعكس مردوداتها الإيجابية على كل من القيمة المبدعة والصورة الذهنية لتلك المنظمات.

Carsten Jaeschke, Oriol Gonzalez, Marta Padilla et al.

In this work, a new generation of gas sensing systems specially designed for breath analysis is presented. The developed system comprises a compact modular, low volume, temperature-controlled sensing chamber with three compartments that can host different sensor types. In the presented system, one compartment contains an array of 8 analog MOX sensors and the other two 10 digital MOX sensors each. Here, we test the system for the detection of low concentrations of several compounds.

Norma Constanza Berdugo-Silva, Wendy Yulieth Montaño Renuma, Karolina González Guerrero

Las instituciones de educación superior son entidades que se encargan de brindar conocimientos de manera integral y de participar en los procesos investigativos que tienen como fin principal, generar transformaciones sociales y aportar a los diferentes sectores como lo es el cultural, social, económico, entre otros. Es por esta razón que, las instituciones de educación superior sirven como apoyo a las organizaciones para realizar mejoras en sus lineamientos, principalmente en los procesos de estructuración de los protocolos y polí­ticas organizacionales, debido a que estas entidades, por lo general, no realizan un adecuado proceso y actualización de los dos elementos antes mencionados; por esta razón, las instituciones de educación superior brindan un apoyo importante mediante el desarrollo de la investigación. Por consiguiente, la investigación tuvo como fin principal resolver la siguiente incógnita: ¿cuál es el papel de las instituciones de educación superior en la restructuración de los protocolos y polí­ticas de las organizaciones? Resaltando la necesidad de que las organizaciones trabajen protocolos basados en mejorar el bienestar y la calidad de vida de los sujetos, más que en la producción.

Ewa Świerzbowska-Kowalik

W artykule prezentowane są wybrane wyniki badania ankietowego przeprowadzonego w ramach grantu Komitetu Badań Naukowych realizowanego przez prof. Małgorzatę Dąbrowę-Szefler na temat „Kadry dla nauki w Polsce - stan i perspektywy” . Autorka zajmuje się w nim przede wszystkim problemem aktywności naukowej doktorantów i znaczeniem tej aktywności dla kształtowania się decyzji o wyborze kariery naukowej. Podejmuje także próbę określenia, w jaki sposób organizacja studiów doktoranckich i charakter współpracy naukowej doktorantów ze środowiskiem naukowym wpływają na stymulowanie tej aktywności.