bluuebunny/crossref_metadata_2025 huggingface dataset:
Document clustering based on the semantic matrix of relationships for conceptual indexing
Authors: Авдеенко Татьяна Владимировна , Мезенцев Юрий Анатольевич
Published: August 2021

Рассматривается проблема кластеризации - автоматического разбиения коллекции документов на группы, близкие по тематике. Предложен новый подход к концептуальному индексированию документов путем перехода от набора ключевых терминов к взвешенному множеству концептов некоторой иерархической модели знаний. Получаемая в результате применения данного метода семантическая матрица связей документов с концептами онтологии может быть использована в качестве матрицы данных для решения задачи кластерного анализа. Оригинальный подход к кластеризации сводится к формализации в виде NP-трудной задачи смешанного программирования, декомпозиции и поэтапному решению, снижающему ее трудоемкость

Purpose. The purpose of this work is to develop a method for document clustering based on conceptual indexing with the help of knowledge taxonomy. Methodology. Solving the problem of document clustering involves two fundamental stages. The first stage is preprocessing of a text document and representing it as a data table suitable for subsequent application of data analysis methods. The second stage is actually the optimization of clustering algorithm, which allows achieving optimal partitioning of the document collection in order to achieve, on the one hand, compactness of clusters, on the other hand, distinctness of clusters. We suggest a new approach to conceptual indexing of documents by transformation of a set of key terms to a weighted set of concepts for a certain hierarchical knowledge model of the application domain. The semantic matrix of document relationships with taxonomy concepts obtained as a result of the approach can be used as a data matrix for solving the clustering problem. For this purpose, we propose an original approach that uses the formalization of an NP-hard mixed programming problem, decomposition, and step-by-step solution that reduces its complexity. Results. As an example of applying the proposed approach, we consider the problem of clustering of 120 documents using 20 features that are terminal concepts of taxonomy. The result of direct clustering across 10 clusters did not guarantee closeness to the optimum, which caused the need for decomposition. The decomposition was carried out according to a two-stage hierarchical scheme: the first stage is the allocation of 2 clusters, the second stage is a sequential 5-clustering of each of the subsets formed at the first stage. The final result of clustering with two-step decomposition was about 20 percent better than the original one. Findings. The results of calculations confirmed the prospects of an optimization approach for clustering documents using a semantic matrix of relationships and revealed computational problems. In particular, the necessity of developing special computing tools and improving the formal statements themselves for reducing the overall complexity of calculations was revealed
The synthesis method of regulators for multichannel systems using neural networks
Authors: Воевода Александр Александрович , Романников Дмитрий Олегович
Published: August 2021

Синтез регуляторов для многоканальных систем - актуальная и сложная задача. Одним из возможных способов синтеза является применение нейронных сетей. Нейронный регулятор либо обучают на предварительно рассчитанных данных, либо используют для настройки параметров ПИД-регулятора из начального устойчивого положения замкнутой системы. Предложено использовать нейронные сети для регулирования двухканального объекта, при этом обучение будет выполняться из неустойчивого (произвольного) начального положения с применением методов обучения нейронных сетей с подкреплением. Предложена структура нейронной сети и замкнутой системы, в которой уставка задается при помощи входного параметра нейронной сети регулятора

The problem for synthesis of automatic control systems is hard, especially for multichannel objects. One of the approaches is the use of neural networks. For the approaches that are based on the use of reinforcement learning, there is an additional issue - supporting of range of values for the set points. The method of synthesis of automatic control systems using neural networks and the process of its learning with reinforcement learning that allows neural networks learning for supporting regulation is proposed in the predefined range of set points. The main steps of the method are 1) to form a neural net input as a state of the object and system set point; 2) to perform modelling of the system with a set of randomly generated set points from the desired range; 3) to perform a one-step of the learning using the Deterministic Policy Gradient method. The originality of the proposed method is that, in contrast to existing methods of using a neural network to synthesize a controller, the proposed method allows training a controller from an unstable initial state in a closed system and set of a range of set points. The method was applied to the problem of stabilizing the outputs of a two-channel object, for which stabilization both outputs and the first near the input set point is required
Logical aspects of experimental design and analysis
Authors: Хабаров Валерий Иванович
Published: August 2021

Предложена схема формализации задач активной идентификации объекта с использованием аппарата теории моделей - современного раздела математической логики. Теория моделей позволяет погрузить предмет “планирование и анализ эксперимента” в контекст семантического анализа. Семантический анализ понимается как установление соответствия между миром и его формальным представлением. С этой точки зрения представления об исследуемом объекте выражаются в некоторой прикладной теории. Предложен вывод модели для данной теории как процесс интерпретации, в котором ключевая роль отводится “экспериментатору”. Полученные результаты могут быть использованы при проектировании архитектур интеллектуальных систем для экспериментальных исследований, для построения онтологии эксперимента, создания баз знаний

Purpose. The purpose of this work is to formalize the tasks of active object identification based on the apparatus of model theory - a modern section of mathematical logic. Model theory allows putting the subject “planning and analysis of an experiment” in the context of semantic analysis. Semantic analysis is understood as establishing a correspondence between the world and its formal representation. From this point of view, the concept of the object under study is expressed in some applied theory, which allows applying formal methods of model theory to it. Methods. It is assumed that the model is derived for this theory as an interpretation process, in which the key role is assigned to the experimenter. As a research method, it is proposed to use commutative diagrams that reflect the process of interpretation and extension of communication diagrams for the so-called equipped theories of planning and analysis of experiments. Results. The properties of the proposed models are proved and examples for planning a regression experiment are presented as an illustration. It is proved that for linear models it is possible to construct a finitely axiomatization capable theory. Findings, originality. The obtained results can be used in the design of architectures for an intelligent system in experimental research, building an experiment ontology and creation of knowledge bases. These studies will allow using logical programming to implement images of the presented commutative diagrams for equipped theories as applied systems for planning and interpreting the experiment
Planning an experiment in the study of air pollution in industrial premises
Authors: Швецова-Шиловская Татьяна Николаевна , Полехина Ольга Васильевна , Иванов Дмитрий Евгеньевич , Скворцов Федор Игоревич
Published: August 2021

Отмечена роль ведущих отечественных ученых В.И. Денисова и В.Г. Горского в становлении и развитии теории планирования эксперимента и прикладных статистических методов анализа данных. На основе математической теории планирования эксперимента исследовано влияние параметров воздушной среды рабочих помещений на интенсивность испарения опасных химических веществ с поверхности пролива. Создана математическая модель, описывающая этот процесс. Данные исследования необходимы для оценки профессионального риска на химических производствах

The article addresses the important problem of assessing the professional risk of workers in industries where the chemical factor is possible, as well as the role of the mathematical theory of experimental design in conducting of experimental research. The role of leading Russian scientists Denisov Vladimir Ivanovich and Gorsky Vladimir Grigoryevich in the establishment and development of experimental design theory and applied statistical data analysis methods is noted in the work. It is noted that in order to successfully solve scientific, industrial, and technological problems, modern research engineer must have competencies in the field of the theory of mathematical statistics, practical skills in planning an experiment, and methods for statistical processing of experimental data. The aim of the studies presented in this paper is to assess the influence of the air environment of the working room (temperature, humidity) on the rate of evaporation of a hazardous chemical from the spill. The experiment was carried out on a facility that allowed varying over a wide range the temperature and humidity. The experiment was carried out in accordance with the plan developed on the basis of the mathematical theory of experimental design. The obtained mathematical model allows estimating the level of air pollution by hazardous chemicals in the temperature and humidity range typical of workrooms. A comparison of the concentrations calculated according to the model with the permissible level of air pollution (MPC of the working zone air) will allow assessing the risk of inhalation exposure to hazardous chemicals on working personnel in local emergency situations. Conducted research is necessary to assess occupational risk in chemical industries
Mathematical modelling of the filtration process in a porous medium based on non-conformal mixed finite element formulation
Authors: Шурина Элла Петровна , Иткина Наталья Борисовна , Трофимова Светлана Алексеевна
Published: August 2021

Статья посвящена математическому моделированию процесса фильтрации жидкости в пористой геологической среде под действием давления. Разрабатывается вычислительная схема решения задачи Дарси на основе смешанной конечноэлементной постановки с использованием разрывного метода Галёркина. Выполнено построение специализированных базисных систем для скорости в пространстве H и давления в пространстве L . Проведены вычислительные эксперименты на классе модельных задач.

The paper addresses mathematical modelling modelling for the process of fluid filtration in porous geological media under pressure. A computational scheme based on a mixed non-conformal variational formulation for solving the Darcy problem with a tensor coefficient of permeability of the medium was developed, implemented and verified. Moreover, the discontinuous Galerkin method for obtaining the finite element approximation was used. A specialized hierarchical basis system for velocity in the H space and a basis system with discontinuous functions on boundaries of finite elements for pressure in the L space were constructed. Computational experiments on a class of problems close to real ones have shown that for a computational domain with multidirectional rectangular inclusions of arbitrary size and concentration, the numerical fields of pressure and velocity are determined with a relative error of 1e-2 even on a coarse grid. An increase in the contrast of the permeability coefficient of the medium with respect to the permeability coefficient of inclusions does not change the relative error in determining the numerical fields. To this end, we can conclude that the constructed computational scheme is stable to significant variation of the coefficient. The authors have developed and verified a software package that is able to export a ready-made solution to the problem in the “.dat” format file for further graphical display and analysis in the Tecplot software package.
Building highly efficient distributed automation systems for circuit design based on data compression
Authors: Анисимов Владимир Иванович , Гридин Владимир Николаевич
Published: August 2021

Рассмотрены вопросы повышения эффективности работы распределенных систем автоматизации схемотехнического проектирования путем минимизации времени взаимодействия веб-сервисов с сетью Интернет на основе методов сжатия данных. Приведены результаты сравнительной оценки эффективности основных методов компактной обработки разреженных матриц при использовании для сжатия данных метода индексно-адресных матриц, списковых схем хранения, метода строчного фиксированного формата, метода строчно-столбцового формата. Известной особенностью методов фиксированного формата является невозможность включения в сжатое описание новых ненулевых элементов, появляющихся при решении уравнений моделируемой схемы. На основе сравнительного анализа методов сжатия данных показано, что наибольший интерес для практической реализации высокоэффективного программного обеспечения систем автоматизированного проектирования представляет метод списковых схем, имеющий наибольшие возможности для сканирования матриц в произвольном направлении. Существенное достоинство метода списковых схем - возможность включения в компактное описание дополнительных ненулевых элементов, которые образуются при решении уравнений.

This article considers the issues of increasing the efficiency of distributed automation systems for circuit design by minimizing the interaction time of web services with the Internet based on data compression methods. The results of a comparative assessment of the effectiveness for the main methods of compact processing of sparse matrices using the method of index-address matrices, list storage schemes, the method of row fixed format, and the method of row-column format are presented. A well-known feature of the fixed-format methods is the impossibility of including in the concise description of new nonzero elements that appear when solving the equations of the simulated circuit. Comparative analysis of data compression methods shows that the method of list circuits, which provides the greatest opportunities for scanning matrices in an arbitrary direction, is of great interest for implementation of highly efficient software for computer-aided design systems. An essential advantage of the list circuit method is the possibility of including additional nonzero elements in the compact description, which are formed when solving equations.
Intelligent system for supporting functional characteristics of radar monitoring based on failure prediction
Authors: Осипов Александр Владимирович , Тимошенко Александр Васильевич , Перлов Анатолий Юрьевич , Львов Кирилл Вячеславович
Published: August 2021

Показаны особенности применения методов искусственного интеллекта в современных радиолокационных комплексах (РЛК) мониторинга для организации превентивного технического обслуживания. Приведена структурно-функциональная схема интеллектуальной системы поддержки функциональных характеристик РЛК. Представлены экспериментальные оценки точности прогнозирования излучаемой мощности РЛК по данным диагностического контроля.

Purpose. This work is devoted to a description of an intelligent support system (ICP) of the functional characteristics of radar systems operating in heat-stressed modes. The purpose of the work is to simulate the operation of the failure prediction module based on the data on the operation of the critical components of the radar. Methodology. Failure prediction based on block temperature data was performed using supervised machine learning methods, including regression methods. The highest quality parameters of the forecasting model (horizon - accuracy) were achieved when training the model using the gradient boosting method, which allows organizing continuous additional training of the forecasting model during the operation of the radar by forming a training sample consisting of a data flow about the technical state. Findings. A structural and functional diagram of the ICP has been developed and a description of the operation of its components is given. The error (20%) and the horizon (20 min.) of the prediction of failures obtained during the experiments are sufficient for the staff serving the radar to take the necessary measures and prevent a critical decrease in the functional characteristics of the product. Originality/value. The introduction of ISP will allow realizing the maximum functional capabilities of the radar, taking into account the forecast of their change, as well as making an operational report to the command post of the radar on the reasons for the decrease in functional readiness according to the pop-up tips about the faulty element and the degree of its influence on the functional characteristics.
Numerical simulation of heat transfer processes during single crystal growth by the Bridgman - Stockbarger method in fixed and rotating crucibles
Authors: Кислицын Степан Александрович , Митин Константин Александрович , Бердников Владимир Степанович
Published: August 2021

Численно методом конечных элементов исследованы процессы кристаллизации кремния в плоскодонных неподвижных и равномерно вращающихся графитовых цилиндрических тиглях в режимах сопряженного конвективного теплообмена. Процессы кристаллизации кремния изучены при фиксированной скорости опускания тигля в холодную зону и различных скоростях его вращения. Опускание тигля имитировалось перемещением точки излома в распределении температуры на внешней стороне стенок тигля. Точка излома - это граница перехода от нагретого до начальной температуры участка стенки к области с заданным градиентом температуры. Использованы адаптивные сетки на треугольниках, отслеживающие положение фронта кристаллизации на каждом временном шаге. Использован пакет программ собственной разработки.

The dependence of both spatial shape and intensity of the convective flow of silicon melt during the growth of a silicon ingot by the Bridgman-Stockbarger method was studied numerically by the finite element method. Stationary and uniformly rotating graphite crucible in conjugate convective heat transfer regines were examined. The simulation was carried out on the basis of dimensionless system of equations for the thermogravitational convection in the Boussinesq approximation using the bipolar approach. In the mixed convection regine, the system of equations was augmented by an equation for the azimuthal velocity. Adaptive grids on triangles were used to track the position of the crystal-melt interface at each time step. The calculations were carried out at a constant rate of lowering the crucible from the hot to the cold zone, equal to 2.81 cm/h, and at a constant temperature gradient equal to 35 K/cm. Lowering the crucible was simulated by moving the inflection point in the temperature distribution on the outside of the crucible walls. The range of angular velocities of crucible rotation from 0 to 10 rpm is considered. It is shown that as the angular velocity of crucible rotation in the axial region increases, both the velocity of the downward flow arising in the regines of thermogravitational convection gradually and the convective heat flux to the crystal-melt interface decrease. As a result, in the range of angular velocities from 2 to 10 rpm, the shape of the crystal-melt interface gradually approaches to the one typical for the thermal conductivity regime. It is shown that at the initial stage of the process at an angular velocity of 10 rpm in the axial region of the cooled crucible bottom, the nucleation of a single crystal is possible.
Scientometrics view on scientific contacts of academician N.N. Yanenko
Authors: Шокин Юрий Иванович , Барахнин Владимир Борисович
Published: August 2021

В данной статье, посвященной столетию со дня рождения выдающегося советского математика и механика, академика АН СССР, Героя Социалистического Труда Николая Николаевича Яненко, представлен подробный анализ его научной генеалогии с использованием проекта “Математическая генеалогия”. Показано, что в научной генеалогии академика Н.Н. Яненко оказались перечислены имена наиболее выдающихся отечественных математиков XIX в., подавляющего большинства крупнейших математиков континентальной Европы XVII - второй половины XIX вв., а также выдающихся астрономов, физиков, медиков, философов, богословов православия, католицизма, англиканства и лютеранства. Кроме того, проанализировано научное сотрудничество Н.Н. Яненко, зафиксированное в Collaboration Distance Project. Установлено, что расстояние соавторства академика Н.Н. Яненко до наиболее известных математиков и физиков ХХ-XXI вв. составляет 3-5.

The present work is devoted to the 100th anniversary of the distinguished Soviet specialist in mathematics and mechanics, academician of the Academy of Sciences of the USSR, Hero of Socialist Labor Nikolai Nikolaevich Yanenko. A detailed analysis of N.N. Yanenko scientific genealogy using the “Mathematical genealogy” project is given. It is demonstrated that the scientific genealogy of N.N. Yanenko contains the name of the most prominent national mathematician of the 19th century, the majority of leading mathematician of the continental Europe of the 16th - 2nd half of the 19th centuries, as well as prominent astronomers, physicists, physicians, philosophers, theologians of the Eastern Orthodox Church, Catholicism, Anglicanism, Lutheranism. The scientific cooperation of N.N. Yanenko is analyzed using the Collaboration Distance Project. The co-authorship distance from N.N. Yanenko to the most famous mathematician and physicists of the 20th-21th centuries is computed to be equal to 3-5.
Automatic definition of web service call zones based on the classification of context of the mobile device
Authors: Воскобойников Михаил Леонтьевич , Федоров Роман Константинович , Ружников Геннадий Михайлович
Published: August 2021

Предложен метод автоматизации активации устройств Интернета вещей на основе классификации геопозиции мобильного устройства. В отличие от других методов пользователь обучает систему активации устройств с помощью примеров и контрпримеров, что значительно снижает требования к квалификации пользователя. Проведено тестирование метода на таких двух устройствах, как шлагбаум и электромеханический замок двери. Полученные результаты тестирования позволяют судить о работоспособности метода и возможности его использования в системах умного дома и города.

Most IoT devices provide an application programming interface such as web service that allows controlling these IoT devices over Internet using a mobile phone. Activation of IoT devices is performed according to the status of user behavior. Both user behavior and activation of IoT devices are periodical. An activation of IoT device is often related with a user geolocation which can be defined by sensors of the mobile device. A method for automated activation of IoT devices based on classification of geolocation of mobile device is proposed. The method implements a supervised learning that simplifies automate activation of IoT devices for the end users. Existing methods demand appropriate end user qualification and require long time to automate activation. For indoor geolocation of the mobile device information from Wi-Fi access points and geolocation GPS sensor is utilized. Data of Wi-Fi and GPS sensors is used to form context of a mobile device. Based on context examples of invoking/not invoking web services the spatial areas are formed. When the mobile device context is within the web service invocation area, the web service is invoked and the associated IoT device is activated. To implement the method, an Android application was developed. The method was tested on a training set that contained 100 training examples of calling two web services: opening an electromechanical door lock and opening a barrier. As a result of testing, the accuracy of classifying the context of a mobile device was 98 percent. The results obtained can be used in the development of smart home and smart city systems.
High efficient method for calculating the Straton - Chu integral for problems of interaction of laser radiation with materials
Authors: Жуков Владимир Петрович , Федорук Михаил Петрович
Published: August 2021

Описан высокоэффективный метод вычисления интеграла Стрэттона-Чу для определения электромагнитного поля, создаваемого отражением плоскопараллельного лазерного импульса от параболического зеркала. Рассмотрены импульс с постоянной во времени амплитудой и импульс фемтосекундной длительности, с зависимостью от времени в виде функции Гаусса. Описанный метод актуален для решения задач о взаимодействии сильно сфокусированных лазерных импульсов с веществом

The interaction of femtosecond laser pulses with materials is usually modelled within the approach of nonlinear Maxwell equations. The laser pulse in the calculations is initiated by specifying the conditions for the electric field at the boundary of the computational domain, which is located at a distance of 100-200 micron from the focus. The usually used Gaussian distribution for the radius and time in the boundary conditions are not applicable for such pulses. It is necessary to consider a real optic system, or a system, which can be realized. In the presented paper we address the situation in which the laser pulse is created by the reflection of parallel pulse from a parabolic mirror. To determine the field near the focus we use the Stratton-Chu integral (SCI), with fast oscillating sub-integral function. It makes very difficult to calculate SCI. In the presented paper a highly efficient method allows to overcome this difficulty. The main idea is that a change of variables is made in the integral, which, in the case of a short pulse being important for applications, allows calculating the integral over one of the variables once for all times. In addition, for this variable, the integrand is smooth and its calculation does not require large computational resources. The paper investigates the accuracy of calculating the SCI by the proposed method and demonstrates its high efficiency
Stochastic optimization over the Pareto front by the augmented weighted Tchebychev program
Authors: Юнси-Аббаси Лейла , Мула Мустафа
Published: August 2021

В этой статье мы предлагаем новый алгоритм для решения многоцелевых задач стохастического целочисленного линейного программирования (MOSILP). Мы оптимизируем данную стохастическую линейную функцию φ по полному набору эффективных решений MOSILP, которые были преобразованы в эквивалентную детерминированную задачу с использованием неопределенных предположений, вводимых лицом, принимающим решения. Для этой цели мы применяем двухэтапный рекурсивный подход, при котором расширенная взвешенная программа Чебышева постепенно оптимизируется для создания эффективного решения, тем самым улучшая значение вспомогательной функции φ . Предлагаемый здесь подход определяет и решает последовательность целочисленных линейных программ с нарастающими ограничениями, так что на каждом этапе алгоритма генерируется новое эффективное решение. Для иллюстрации представлен числовой пример

In this paper, we propose a novel algorithm to deal with multi-objective stochastic integer linear programming problems (MOSILP). Given a stochastic linear function φ , we will optimize it over the full set of efficient solutions of a MOSILP. We convert the latter into an equivalent deterministic problem using uncertain aspirations which are inputs specified by the decision maker. For this purpose, we adopt a 2-stage recourse approach where an augmented weighted Tchebychev program is progressively optimized to generate an efficient solution, the value of the utility function φ is improved to enumerate all efficient solutions. The approach proposed here defines and solves a sequence of progressively more constrained integer linear programs, so that a new efficient solution is generated at each step of the algorithm. A numerical example is presented for illustration
Interpretation and significance of the definition of anti-Mullerian hormone in the practice of juvenile gynaecologist
Authors: Kumykova Zaira K. , Uvarova Elena V. , Batyrova Zalina K.
Published: August 2021

The article presents an overview of the physiological role of anti-Mullerian hormone (AMH) during persons lifetime, the fluctuations of its values from birth to the reproductive period in women, the significance of its determination in the diagnosis and prognosis of treatment outcomes for many gynecological diseases. AMH is produced mainly by preantral and early antral follicles and decreases during the final maturation and luteinization. AMH plays a potential role in preserving the ovarian reserve by performing dual actions. AMH inhibits the initial recruitment of follicles, preventing the influence of stimulating growth factors for recruitment (KIT-ligand, the main fibroblast growth factor). From the moment of puberty, AMH reduces the sensitivity of primary follicles to the follicle-stimulating hormone, reducing the likelihood of their cyclic recruitment. The systematic review data presented the characteristics of the ovarian reserve in a healthy female population aged 0 to 19 years. At birth, very low AMH values were noted with an increase in its level in the first 3 months of life, followed by a monthly increase of 31%. A significant increase in AMH secretion was revealed by the beginning of puberty, then most authors noted a constant level of serum AMH in the adolescent period. The level of AMH in the blood serum decreases with an increase in chronological age by 68% annually and varies during the menstrual cycle. AMH is an important diagnostic tool in pediatric practice when differentiating various causes of puberty disorders, virilization and menstrual cycle disorders in girls.
Optimization of the micronutrients sufficiency of feeding women and children on exclusively breastfeeding by enriching of the woman diet
Authors: Kodentsova Vera M. , Risnik Dmitry V. , Pavlovich Stanislav V. , Ladodo Olga B.
Published: August 2021

A significant part of pregnant and lactating women have a lack of several micronutrients at once (vitamin D, group B, iodine, iron, etc.). The secretion of vitamins A, E, D, C, B1, B2, B6, B12, iodine and selenium into breast milk decreases with their insufficient consumption and insufficient provision of the nursing mother. The content of folates, calcium, magnesium, phosphorus in breast milk is maintained even if they are insufficient in the mother, however, enriching the diet with them during breastfeeding, improving the status of the mother, prevents the depletion of reserves in her body. The iron and zinc content in breast milk is determined by the mothers status during pregnancy. The intake of vitamin-mineral supplements or food products enriched with micronutrients during the pregravid period, during pregnancy and lactation leads to an improvement in the provision of a woman and her child by increasing the content of vitamins, iodine and selenium in breast milk. The use of vitamin-mineral supplements is an effective way not only to eliminate multiple micronutrient deficiencies in the diet and improve the status of a lactating woman, but also to optimize the vitamin composition of breast milk and the provision of an exclusively breastfed baby.
Investigación oceanográfica conjunta en la región Pacífico sudeste y su proyección
Authors: Cabrera Luna Edgard Enrico , Blanco García José Luis
Published: August 2021

Los efectos e impactos de la variabilidad climática en pacífico Sudoriental asociados a fenómenos como El Niño-Oscilación de Sur, han sido motivo de estudio a nivel nacional y regional, con el objeto se desarrollar capacidades de predicción de condiciones extremas océano-atmosféricas, para evitar pérdidas humanas y económicas en diferentes sectores productivos. En este artículo, se presentan los antecedentes de los esfuerzos investigativos desarrollados, en especial bajo la coordinación del programa Estudio Regional de fenómeno El Niño (ERFEN) de la Comisión Permanente del Pacífico Sur; el resumen de los resultados obtenidos en los dos cruceros regionales conjuntos (1998-1999) las lecciones aprendidas y las proyecciones futuras de implementación de un sistema regional de observación operacional.
Diagnóstico ambiental del Archipiélago Isla del Rosario como fundamento para su ordenamiento territorial
Authors: Garay Tinoco Jesús Antonio , Vélez María Teresa , Becerra Jaime , Mendoza Mazzeo Luis Alvaro , Pedraza Rodrigo , Cabanzo Francisco
Published: August 2021

La metodología propuesta por Garay et al., ( 1998) fue aplicada para la elaboración del diagnóstico ambiental del Archipiélago Islas del Rosario, con el objetivo de identificar las actividades de mayor impacto sobre los recursos del sistema, los conflictos entre actores y agentes, las áreas críticas y va liosas, los elementos estratégicos y críticos, y ponderar los problemas ambientales y la capacidad de gestión ambiental para solucionarlos, proponiendo a partir de este análisis integral, una Agenda Preliminar para la gestión ambiental de la zona insular, de la cual hace parte el Plan de Ordenamiento Territoria
Upaya Peningkatan Hasil Belajar Peserta Didik Pada Pembelajaran Daring Tema Globalisasi Melalui Media Quizizz Kelas VI SD Negeri Kutowinangun 11 Kota Salatiga Tahun Pelajaran 2020/2021
Authors: Elma Elma Mulia Sari
Published: August 2021

ABSTRAK Penelitian ini memiliki tujuan untuk mengukur  peningkatan hasil belajar peserta didik dalam pembelajaran daring melalui media game edukasi Quizizz. Penelitian ini merupakan penelitian kuantitatif deskriptif yang terfokus pada evaluasi pembelajaran menggunakan media online. Populasi penelitian yakni seluruh peserta didik SD Negeri Kutowinangun 11 Kota Salatiga yang diajar pada mata pelajaran tematik menggunakan metode daring sebanyak 21 peserta didik. Penelitian ini dilaksanakan 2 siklus, masing-masing siklus 1 kali pertemuan. Setiap pertemuan terdisi dari 4 tahap yaitu perencanaan, pelaksanaan, observasi, dan refleksi. Pelaksanaan tahap-tahap penelitian sedikit berbeda dari pembelajaran dalam kelas karena pembelajaran dilakukan secara terpisah atau peserta didik berada di rumah masing-masing.  Berdasarkan hasil penelitian, pada siklus I diperoleh nilai rata-rata hasil belajar peserta didik 51,43 dengan kategori cukup. Sedangkan pada siklus II diperoleh nilai rata-rata hasil belajar peserta didik 91,90 dengan kategori tinggi. Jadi dari siklus I dan siklus II terjadi peningkatan hasil belajar peserta didik sebanyak 40,47. Dengan demikian dapat disimpulkan bahwa media belajar berbasis game edukasi quizizz dapat meningkatkan hasil belajar peserta didik dalam pembelajaran daring pada tema Globalisasi.Kata Kunci: Hasil  Belajar, Pembelajaran Daring, Game Edukasi ABSTRACT This study aims to measure the increase in student learning outcomes in online learning through educational game media Quizizz. This research is a descriptive quantitative study that focuses on evaluating learning using online media. The study population was all students of SD Negeri Kutowinangun 11 Kota Salatiga who were taught on thematic subjects using online methods as many as 21 students. This research was conducted in 2 cycles, each cycle 1 meeting. Each meeting consists of 4 stages, namely planning, implementing, observing, and reflecting. The implementation of the research stages is slightly different from classroom learning because learning is carried out separately or students are in their respective homes. Based on the results of the study, in the first cycle the average value of student learning outcomes was 51.43 in the sufficient category. Whereas in the second cycle the average value of student learning outcomes was 91.90 in the high category. So from cycle I and cycle II there was an increase in student learning outcomes by 40.47. Thus it can be concluded that learning media based on quizizz educational games can improve student learning outcomes in online learning on the theme of Globalization.Keywords: Learning Outcomes, Online Learning, Educational Games
Upaya Meningkatkan Motivasi Belajar Tema Wirausaha Siswa Kelas 6 SD Negeri 1 Bonyokan Melalui Media Power Point Dengan Berbantu Aplikasi Google Meet Tahun Pelajaran 2020/2021
Authors: Winarsih Tyas , Purwati Heni , Hendriyanti Lia Maylani
Published: August 2021

ABSTRAK                 Tujuan Penelitian ini adalah untuk meningkatkan motivasi  belajar tema wirausaha siswa kelas 6 SD Negeri 1 Bonyokan melalui media power point dengan berbantu aplikasi google meet.Penelitian ini merupakan Penelitian Tindakan Kelas (PTK). Penelitian dilakukan dalam tiga siklus. Subjek penelitian adalah siswa kelas 6 yang berjumlah 22 siswa. Sumber data berasal dari siswa, guru, data dan dokumen. Teknik pengumpulan data dengan observasi, tes, dokumentasi. Analisis data menggunakan teknik analisis deskriptif dan teknik analisis secara kualitatif.Hasil penelitian ini menunjukkan bahwa melalui media power point dengan berbantu aplikasi google meet dapat meningkatkan motivasi belajar tema wirausaha siswa kelas 6 SD Negeri 1 Bonyokan Tahun Pelajaran 2020/2021. Peningkatan terjadi pada siklus I sebesar 70% pada motivasi belajar maupun pada hasil belajar, walaupun belum optimal. Pelaksanaan siklus II menyebabkan motivasi dan hasil belajar siswa mencapai kualifikasi lebih tinggi yaitu 80% pada motivasi belajar dan 90 % pada hasil belajar. Pelaksanaan siklus III  motivasi dan hasil belajar siswa terjadi peningkatan yang sangat signifikan yaitu  95 % pada motivasi belajar maupun hasil belajar siswa.Simpulan penelitian ini adalah penerapan media power point berbantu aplikasi google meet dapat meningkatkan motivasi belajar tema wirausaha siswa kelas 6 SD Negeri 1 Bonyokan Tahun Pelajaran 2020/2021 Kata Kunci: powet point, google meet, motivasi belajar  ABSTRACT The purpose of the research is to improve the motivation of learning tema wirausaha on sixth grade students of SDN 1 Bonyokan by using power point media and google meet. This is a classroom action research. This research is carried out on three cycles. Subject of the research is 22 of sixth grade students. Source of data are from students, teacher and document. Technique of validity data uses source of data triangulation. Analysis of data uses descriptive analysis technique and qualitative analysis technique.The result of the research shows that by using power point and google meet can improve the motivation of learning tema wirausaha of sixth grade students SDN 1 Bonyokan in academic year 2020/2021. The improvement occurs in cycle 1. It improves about 70% on motivation of learning and 70% on result of learning. On cycle 2, there are high qualification on 80 % of motivation  and 90% of  result of learning. On cycle 3, there are significant improvement on motivation and result of learning. It is 95% on motivation  on result of learning.The conclusion of the research is implementing power point media and google meet can improve motivation of learning’s students on tema wirausaha of students of SDN 1 Bonyokan in academic year 2020/2021    Keyword: power point, google meet, motivation of learning
Peningkatan Hasil Belajar Tematik Siswa melalui Metode Discovery Learning pada Siswa SD Negeri Pucangluwuk 02 Kecamatan Bojong Kabupaten Tegal Tahun pelajaran 2020/2021
Authors: Putri Lilik Nurendah
Published: August 2021

Lilik Nurendah Putri , Peningkatan Hasil Belajar Tematik Tema 5 Subtema 1 melalui Model Pembelajaran Discovery Learning pada Siswa Kelas VI SD Negeri Pucangluwuk 02 Kecamatan Bojong Kabupaten Tegal Tahun Pelajaran 2020/2021. Hasil belajar siswa pada pembelajaran tematik tema 5 subtema 1 perlu ditingkatkan, oleh karena itu pembelajaran harus lebih menarik, efektif dan menyenangkan. Salah satu cara yang dapat dilakukan yaitu melalui peerapan model pembelajaran Discovery Learning dimana siswa diminta untuk menemukan pengalaman belajarnya sendiri. Penelitian ini bertujuan untuk mengetahui pengaruh penerapan model Discovery Learning terhadap hasil belajar tematik siswa kelas VI SD Negeri Pucangluwuk 02 Kecamatan Bojong Kabupaten Tegal. Adapun sampel penelitian adalah siswa kelas VI SD Negeri Pucangluwuk 02 yang berjumlah 15 siswa. Data di kumpulkan melalui kegiatan prasiklus, siklus 1, dan siklus 2. Hasil penelitian ini menunjukkan bahwa hasil belajar tematik tema 5 subtema 1 siswa SD Negeri pucangluwuk 02 sebelum menggunakan metode Discovery learning dan setelah menggunakan model Discovery learning mengalami peningkatan.  Kata Kunci: hasil belajar 1, tematik 2, discovery learning 3 (maksimal 4 kata kunci) ABSTRACT Lilik Nurendah Putri, Thematic Learning Outcomes Improvement in Theme 5 Sub-theme 1 through the Discovery Learning Model for Class VI Students of SD Negeri Pucangluwuk 02, Bojong District, Tegal Regency, Academic Year 2020/2021. Student learning outcomes in thematic learning in theme 5 sub-theme 1 need to be improved, therefore learning must be more interesting, effective and fun. One way that can be done is through the application of the Discovery Learning learning model where students are asked to find their own learning experiences. This study aims to determine the effect of the application of the Discovery Learning model on thematic learning outcomes of grade VI SD Negeri Pucangluwuk 02, Bojong District, Tegal Regency. The research sample was the sixth grade students of SD Negeri Pucangluwuk 02, totaling 15 students. The data were collected through pre-cycle activities, cycle 1, and cycle 2. The results of this study indicate that the thematic learning outcomes of theme 5 sub-themes 1 of SD Negeri Pucangluwuk 02 before using the Discovery learning method and after using the Discovery learning model have increased.Keywords: learning outcomes 1, thematic 2, discovery learning 3 (maximum 4 keywords)
Pelaksanaan Pembelajaran Ekstrakurikuler Menggambar terhadap Hasil Prestasi di SDIT Az-Zahra Demak
Authors: Hapsari Winda Novia
Published: August 2021

Dunia pendidikan tidak dapat terlepas dan terpisahkan dari suatu lembaga pendidikan formal seperti pada sekolah dasar. Dalam pembelajaran sekolah dasar, pendidikan seni tertera dalam kurikulum di SD karena memuat materi pelajaran seni budaya dan keterampilan (SBdP). Kegiatan ekstrakurikuler sebagai salah satu cara sekolah untuk dapat membantu siswa dalam mengembangkan bakat seni dan karakteristik mereka. Kegiatan ekstrakurikuler atau yang sering disebut ekskul ini merupakan kegiatan tambahan yang di buat oleh setiap sekolah diluar jam wajib atau intrakurikuler. Penelitian ini bertujuan untuk mendeskripsikan (1) pelaksanaan pembelajaran ekstrakurikuler menggambar di SDIT Az-Zahra Demak sebelum sekolah diliburkan, (2) hasil prestasi yang sudah diperoleh siswa dengan adanya pelaksanaan pembelajaran ekstrakurikuler menggambar di SDIT Az-Zahra Demak sebelum sekolah diliburkan. Data dikumpulkan dengan menggunakan metode observasi, wawancara, catatan lapangan, angket,  dan dokumentasi serta dianalisis dengan teknik deskriptif dan kualitatif. Hasil penelitian adalah: (1) pembelajaran ekstrakurikuler menggambar di SDIT Az-Zahra Demak termasuk dalam kategori baik, dimana guru telah melakukan pembelajaran melalui beberapa tahapan yang sesuai dengan prosedur pembelajaran, (2) hasil prestasi terhadap pembelajaran ekstrakurikuler menggambar di SDIT Az-Zahra Demak sudah terwujud dengan baik terbukti dengan perolehan kejuaraan di berbagai even lomba. Kata Kunci: pembelajaran, ekstrakurikuler menggambar, hasil prestasi
PELUANG DAN TANTANGAN GLOBALISASI PROFESI BIMBINGAN DAN KONSELING
Authors: SURYA MUHAMMAD
Published: August 2021

The Rapid Growth of science and technology in global area makes the space and time be unlimited. the relationship among people is more intensive, deeeper, and more rapid than before. this condition gives more chances and challenges for counceling and guidance profession. This opportunity is that we can give counseling trough cyercounseling, multicultural counseling, spiritual counseling and holistic approach. the capability and adaptability of the conselor in coling technology become more and more chalenging.Keyword : Commnication Technology, education, counceling and guidance profession, globalization
HUBUNGAN ANTARA MOTIF BERPRESTASI, MOTIF BERAFILIASI, DAN MOTIF BERKUASA DENGAN DISIPLIN TATA TERTIB SEKOLAH
Authors: SUHARNO AGUS
Published: August 2021

The main concern of this study was to find out : (1) the corelation between achievement motive, affiliation motive, power motive, and school disipline; (2)?é?áthe corelation between achievement motive and school disipline; (3)?é?áthe corelation between affiliation motive and school disipline; (4)the corelation between power motive and school disipline. The subject of this study were 320 second grade students of state senior high school. The study was conducted in the third semester of 1995/1996. Questionnaire, and documentation were used for collecting data. The data were analyzed by regession analysis and partial correlation. The results of the study were as follows : (1) There was significant correlation between achievement motive, affiliation motive, and power motive and shool disipline; (2) There was a positive relation between achievement motive and school disipline; (3) There was a positive relation between affiliation motive and school disipline; (4) There was negative relation between power motive and school disipline. Keyword : achievement motive, affiliation motive, power motive, shool disipline
Peningkatan Keterampilan Menulis Descriptive Text Pada Mata Pelajaran Bahasa Inggris Dengan Menggunakan Media Hp Android Di Kelas X-MIPA-1 SMA Negeri 7 Semarang Tahun Pelajaran 2018/2019
Authors: Indriyastuti Atiek
Published: August 2021

Tujuan Penelitian ini adalah untuk mengetahui sejauh mana peningkatan keterampilan siswa dalam menulis descriptive text di Kelas X-MIPA-1 SMA Negeri 7 Semarang semester 1 Tahun Pelajaran 2018/2019 sebagai hasil penggunaan Media HP Android. Penelitian ini juga digunakan untuk mengetahui  sejauh mana peningkatan pengetahuan dan sikap belajar siswa selama pembelajaran. Metode yang digunakan dalam penelitian ini adalah metode Penelitian Tindakan Kelas dengan teknik siklus yang terdiri dari dua tindakan siklus yaitu siklus 1 dan siklus 2. Alat pengumpulan data yang digunakan untuk data kuantitatif berupa tes tertulis ulangan harian dan data kualitatif digunakan lembar observasi atau pengamatan, lembar refleksi diri, lembar penilaian antar teman, dan rubrik penilaian kinerja. Hasil penelitian menunjukkan media hp android dapat meningkatkan keterampilan menulis descriptive text. Ketuntasan Belajar mengalami peningkatan dari kondisi awal 53,13% menjadi 65,63% pada siklus I dan meningkat menjadi 93,75% pada siklus II. Peningkatan keterampilan siswa dalam menulis descriptive text  pada siklus I mencapai 2,53% dari rata-rata hasil belajar pada pra siklus dan hasil belajar pada siklus II mengalami peningkatan sebesar6,81% dari rata-rata hasil belajar  pada siklus I atau mengalami peningkatan sebesar 9,34% jika dibandingkan dengan rata-rata hasil belajar pada pra siklus.Kata Kunci: Menulis- descriptive-hp android