bluuebunny/crossref_metadata_2025_split huggingface dataset:
Double Twin Domination Number Of Peculiar Graphs
Authors: Mahadeven G. , Anuthiya S. 
Published: May 2020

Abstract
G. Mahadevan, et, al., introduced the concept of Double Twin Domination number of a graph. DTwin (u, v) is sum of number of a u − v paths of length less than or equal to four. The total number of vertices that dominates every pair of vertices

SDTwin
(
G
)
=
∑
D
T
w
i
n
(
u
,
v
)

for

u
,
v
∈
V
(
G
)

The double twin domination number of G is defined as

D
T
D
(
G
)
=

S
D
T
w
i
n
(
G
)

(

n

2

)

. In this paper we explore this parameter for Pan, Helm, Triangular Snake, related graphs.
η-Ricci soliton on f-Kenmotsu manifolds.
Authors: Shivaprasanna G S , Haque Md. Samiul , Somashekhara G 
Published: May 2020

AbstractThe objective of the paper is to studyη-Ricci soliton on an Einstein like Ricci tensor in f-Kenmotsu manifold. Further we have study curvature tensor R satisfying generalised recurrent,R(U1,U2).Mp=0 andMp(ς,U1).S=0.
Bifurcation and Chaos Control for Prey Predator Model with Step Size in Discrete Time
Authors: George Maria Selvam A , Britto Jacob S , Dhineshbabu R 
Published: May 2020

Abstract
The Lotka – Volterra systems served as a basis for the development and analysis of more realistic mathematical models of nonlinear interactions. A new form of discrete time 2-D prey predator model involving Lesile - Gower functional response with step size is proposed for discussion. Utilizing Euler scheme, discrete system is obtained from the continuous dynamical system. Dynamical consistency of the model which includes the existence and stability of the fixed points is investigated. Eigenvalues of Jacobian matrix are computed for corresponding fixed points. Analytical results illustrate rich dynamics and complexity of the model. The bifurcation theory is employed to study the existence of flip and Neimark-Sacker bifurcations. The chaos control of the discrete system is performed and numerical simulations are provided supporting the results.
Application of artificial neural networks to solution of variational problems in hydrodynamics
Authors: Kornaeva E , Kornaev A , Egorov S 
Published: May 2020

Abstract
The paper deals with a combined approach to approximation of velocity fields and minimization the objective functional in solving viscous fluids flow problems. The mathematical formulation of the problem is presented in the form of a generalized Lagrange functional. The flow function is designed using a feed forward artificial neural network with one hidden layer and with logistic activation function. The boundary values of the flow function are determined using the fluid flow rate. Thus, the problem of determination the velocity field is reduced to the problem of finding the network weights by minimizing the generalized Lagrange functional.
Dual-contoured model of cardiovascular system regulation
Authors: Korobov A A , Frolov S V , Aliyev N E , Rodionova I E 
Published: May 2020

Abstract
The purpose of the study is to create a model of the cardiovascular system that gives an adequate description of the processes of hemodynamic regulation for the needs of intensive care. An overview of the most recent significant blood circulation models that take the regulation processes into account is proposed, the peculiarities and limitations of such models are identified. The methods of computational hemodynamics and mathematical modeling are used. A zero-dimensional dynamic mathematical model of cardiovascular system with two regulatory contours suggested by its authors is described. The results of the study are of interest to intensive care doctors in selecting a treatment strategy.
System of vestibular assessment using video-oculography and electroencephalography data
Authors: Neprokin A V , Gorbunov A V , Tugolukov E N , Dolgov E P 
Published: May 2020

Abstract
This paper presents a new system for combined analysis of video-oculography and electroencephalography data during vestibular testing. The experimental setup consists of electroencephalography amplifier using 9EEG system of electrode placement and a low-cost, head-mounted device for video-oculography. The developed system has simple implementation and provides the possibility of simultaneous analysis of the nystagmus and bioelectrical activity of the brain during positional maneuvers, that can be used for differential diagnosis of dizziness and epilepsy.
Modeling of vertical spindle head for machining center
Authors: Krol O , Sokolov V , Tsankov P 
Published: May 2020

Abstract
The design of the vertical spindle head, which is part of the modular technological equipment of horizontal drilling-milling and boring machining centers, is considered. Three-dimensional modeling of parts and assembly units of the spindle head has been performed in the environment of integrated CAD system KOMPAS-3D. The effectiveness of full-featured specialized applications in the design process of the structure main components in the KOMPAS environment is noted. Built-in “Shafts and mechanical transmissions” applications for creating a vertical spindle head model the design procedures in the shortest possible time are provide. An assessment of the forming spindle assembly dynamic functioning quality on which external loading acts, with probabilistic nature is made. The spectral analysis method is used to evaluate the dynamic characteristics of the structure under consideration.
Method for identification, stability analysis and the dynamics monitoring of sociotechnical clusters
Authors: Borisov V , Dli M , Zaenchkovsky A , Fedulov Ya 
Published: May 2020

Abstract
The problem arising in the study of sociotechnical clusters is revealed. This problem consists in the impossibility of using a standard approach for the identification and sociotechnical clusters analysis, which does not take into account the relationship of coordinated interaction between objects in such clusters, depending on their goals and objectives. The set of indicators for the identification and analysis of sociotechnical clusters is substantiated. These indicators are based on fuzzy relations of concerted interaction between objects in such clusters. The original method for identification, stability analysis and the dynamics monitoring of sociotechnical clusters is proposed. The proposed method, in contrast to the known ones, allows you to analyze: the changing of the sociotechnical clusters sizes; the sociotechnical cluster centre drift; the separation and merging of these clusters; the emergence and disappearance of sociotechnical clusters. Fuzzy cognitive approach is used for the first time: firstly, to justify and estimate a set of indicators for sociotechnical clusters; secondly, for the stability analysis of these sociotechnical clusters.
Information support of the measuring device for choosing a thermophysical experiment data processing algorithm
Authors: Dmitriev O S , Zhyvenkova A A , Dmitriev A O , Barsukov A A 
Published: May 2020

Abstract
This paper addresses the problem of constructing a subsystem of informational decision-making support for choosing the optimal method and algorithm for calculating the thermophysical properties of polymer composites, which allows minimizing the error in determining properties under given experimental conditions. The subsystem is based on a modified hierarchy analysis method. It is built on the alternative use of four algorithms for the calculation of thermophysical properties and is included as a module in the application software of an intelligent data-measuring device for studying the curing process of polymer composites. Using simulation modeling, an assessment of the possibility of using algorithms for calculating thermophysical properties under various combinations of experimental conditions was made. The structure, composition, principles of construction, purpose, capabilities and parameters of the main modules of the applied software of the data-measuring device are described.
Simulation of the thermophysical experiment with remote control to determine the quality properties of the object
Authors: Selivanova Z M , Kurenkov D S , Hoang T A 
Published: May 2020

Abstract
Simulation of the thermophysical experiment for determination of thermophysical properties of insulating materials using the impulse method in the influence of a linear heat source on the test material and mathematical model of the process of thermophysical measurement is fulfilled in MathCad software. As a result of the simulation the optimum operating parameters for thermophysical measurements are determined: optimum operating parameters and thermal pulse repetition time interval in minimum measurement error of coefficients of thermal conductivity and thermal diffusivity of materials. The structure of an intelligent information-measuring system of remote control is offered that realizes the structure of an intelligent information-measuring system of remote control using methods of artificial intelligence that let us increase the efficiency and accuracy of determining the thermophysical properties of insulating materials.
Data mining of students’ behavior in E-learning system
Authors: Gushchina O M , Ochepovsky A V 
Published: May 2020

Abstract
The article deals with educational data mining techniques aimed at increasing effectiveness of E-learning process as well as the idea of adaptive feedback, individual assessment and more personalized attention to student’s profile due to dynamic monitoring and tracking of students’ behavior in the E-learning system. The following techniques are identified: cluster analysis to determine the most popular time threshold for the task per session; analysis and visualization of data to highlight the main options that contribute to the effective completion of courses, and the most popular educational resources; V-fold cross-checking with the use of statistical processing aimed at students by their main indicators of activity to determine the correlation between high percentage of activity and academic performance. The proposed educational data mining techniques allow to assess student’s behavior in the E-learning system for understanding student’s interest in studying the learning materials and assessing the quality of educational content.
Validity of Mathematic Learning Teaching Administration on Realistic Mathematics Education Based Approach to Improve Problem Solving
Authors: Santoso B , Syarifuddin H 
Published: May 2020

Abstract
The purpose of this study is to produce a learning tools based on Realistic Mathematics Education that is valid, practical, and effective against the problem solving abilities of students in class VII. Learning Tools are developed Lesson Plan (LP) and Student Worksheets (SW). This research is a development research with Plomp model of the which consists of three stages items, namely preliminary research, development, and improvement. At the development stage, the learning tools design and evaluation is carried out through formative evaluations.
Convergence Analysis of Euler-Maruyama Method on Ornstein-Uhlenbeck Equation
Authors: Rahman E S , Subhan M , Maulana Heru 
Published: May 2020

Abstract
The Ornstein-Uhlenbeck stochastic differential equation is a one of the most applied equation in financial mathematics. To find the analytical solution of the equation is very difficult, so the numerical solution is the choice. One of the numerical method that can be used is Euler-Maruyama method. In this paper, we analyze the convergence of Euler-Maruyama method using Lipschitz condition and other concepts. The analysis shows that numerical solution of Ornstein-Uhlenbeck equation that resulted by Euler-Maruyama method has strong convergence to the exact solution.
Practicality of geometry learning set based on van hiele theory to increase students’ mathematical communication ability
Authors: Andila Y D , Musdi E 
Published: May 2020

Abstract
Geometry is one of the important subject in mathematics. One of the objectives of learning geometry is the students can gain confidence about their mathematical abilities and be able to communicate mathematically. However, in their practices students are still having difficulty understanding geometric material and students’ mathematical communication skills are also still low. Considering the importance of geometry learning, the students’ mathematical communication ability need to be improved to achieve geometry leaning goals. In this study, geometry learning devices were developed based on the Van Hiele Theory with the purpose to produce a product consisting of lesson plan and students worksheet to develop students’ mathematical communication ability. The development model used is Model Plomp. Based on the results obtained in small group stage, there is increase in students’ mathematical communication ability seen from the result of working the questions every meeting. Then, an analysis the questionnaire of students who obtained practical category. So that, it can be conclude that geometry learning sets based don Van Hiele Theory practical can be used to increase Students Mathematical Communication Ability in Class VII Junior High School.
Practicality of Learning Tools Based on Contextual Teaching and Learning Approach to Improve Mathematical Communication Skills for High School Students Grade VII
Authors: Putri Y U , Musdi E 
Published: May 2020

AbstractThis study aims to develop mathematics learning tools based on contextual teaching and learning approaches in the form of lesson plan and student worksheets for high school students grade VII. This research is a development research. Model used is Plomp model which consists of three stages, namely the initial investigation phase, the prototype development stage, and the assessment stage. This research is limited to the prototype development stage to see the practicality of learning devices that has been designed. Based on the test results of the practicality of learning tools through three assessment data, namely, the observation sheet data of the implementation of learning with an average of 89.38% - the category is very practical, the teacher questionnaire data with an average of 88% - the category is very practical, and the questionnaire data of students’ responses with an average of 86.93% - the category is very practical. The results shows that the mathematics learning tool based on contextual teaching and learning approach is valid and practical.
Design of Mathematics Learning Devices Based On Professional Competency On Video Audio Engineering Expert Programs
Authors: Kurniawan D , Armiati A , Fauzan A , Yerizon Y 
Published: May 2020

Abstract
Vocational students are prepared to work and have expertise in the vocational field, therefore learning in vocational schools should pay attention to the professional competencies of the students themselves. Learning mathematics in vocational schools in learning mathematics does not relate the relationship of mathematics to the subject matter so that made students bored in learning mathematics and think mathematics is a difficult, unattractive and less useful lesson. Learners prefer productive subjects according to their professional competence. This will affect the purpose of learning mathematics in Vocational Schools in improving students’ mathematical problem solving skills. The development of professional competency-based learning tools is expected to overcome the problem of increasing problem-solving skills of vocational students in the audio video engineering program. This study aims to develop learning tools in the form of Learning Implementation Plans (RPP) and Student Worksheets (LKPD) using the Plomp model which consists of three stages: preliminary research, stage prototype, and assessment phase. This article is a preliminary research phase, which is needs analysis, curriculum analysis, and concept analysis, analysis of students and teachers of vocational mathematics. Audio video techniques. The results in the Preliminary Research stage become a reference in designing products in the form of mathematics-based professional learning devices in the audio video engineering expertise program.
Ludo Game Implementation to Improve Student’s Motivation and Interest to Learn Mathematics for 3rd Grade in SDN 19 Nan Sabaris
Authors: Ulhusna M , Putri S D , Zakirman Z 
Published: May 2020

Abstract
This research is motivated by the low interest and motivation of students to learn mathematics in the third grade of SDN 19 Nan Sabaris. The purpose of this study was to see the effect of Ludo media to increase the interest and motivation of mathematics learning in third grade students of SDN 19 Nan Sabaris. This type of research is quasi-experimental with a sample of all third grade students of SDN 19 Nan Sabaris registered in the 2018/2019 school year. The research instrument used was in the form of a questionnaire to see motivation and student learning interest in mathematics in grade III of SDN 19 Nan Sabaris. The data analysis technique used is paired-sample t-test. The results of data analysis showed that there were significant differences in the results of interest in and motivation to learn mathematics in third grade students at SDN 19 Nan Sabaris. This means that the use of ludo game media can significantly increase students’ interest and motivation in learning about Mathematics.
Curriculum analysis design and creative product craft expertise program in the developing the mathematics learning devices based on realistic mathematics education approach
Authors: Putri I , Armiati A , Permana D , Yerizon Y 
Published: May 2020

Abstract
This research is development research using Plomp development model. This research aimed to analyze the curriculum between mathematics and productive subjects of design and creative product craft expertise program. Analysis curriculum aims to obtain information in developing the mathematics learning devices in the form of Learning Plans and Student Worksheet based on Realistic Mathematics Education (RME) approach
The development of mathematics teaching media based on problem based instruction to enhance grade x high school students’ critical thinking
Authors: Cahyani F P , Irwan  
Published: May 2020

Abstract
This research discusses the development of mathematics learning media based on problem-based instruction (PBI) to enhance students’ critical thinking skill in grade X. The developed learning media are lesson plan and students’ worksheets. The research was conducted until preliminary research phase including need analysis, student analysis, curriculum analysis and concept analysis by using Plomp model (Preliminary Research, Prototyping Phase, and Assessment Phase). Data collected through observation, questionnaire, and interview. The sample is Grade X students of SMAN 15 Padang. The results shown that the learning media used are not facilitating students’ critical thinking skill in teaching-learning process.
Preliminary Research of Model Eliciting Activities learning Based to Improve Junior High School Students’ Mathematical Critical Thinking Ability
Authors: Delfia S , Irwan I , Yerizon Y 
Published: May 2020

Abstract
Mathematical critical thinking ability of junior high school students in Indonesia is still low. Previous studies indicate that critical thinking ability of junior high school students is ≤ 50%. The inavailability of a helpful learning tool turns out to be the ground of lack of development on the students’ critical thinking ability at junior high schools. This condition is the foundation of conducting development research on learning tool using Model Eliciting Activities (MEAs) to improve the mathematical critical thinking of junior high school students. This research is part of the phases of plomp model development that is the premilinary research. The research is investigation study in which the activities in this introductory research are analyzing prerequisite and context (analysis of curriculum, concept and students) and review of related literature. The data are collected through questionnaires, interviews, documentation, and test of critical thinking ability. The data gained are examined descriptively. The subjects of the study are the students of SMP Negeri 8 Padang Grade VIII and the math teacher. Conclusion of this preliminary research is that it is imperative to develop MEAs based learning tool in math learning to advance critical thinking ability of junior high school students.
Development of Mathematics Learning Tools Based on Realistic Mathematics Education for Vocational High School Students
Authors: Doli W , Armiati A 
Published: May 2020

Abstract
Based on the results of observation and experience of researchers as mathematics teachers in one of the vocational high schools in Indonesia, information are obtained that the average mathematics scores of students are still below the Minimum Mastery Criteria. This is caused by: the mind-set of students who think mathematics is not important compared to the subject of vocational specialization, the learning process is less engrossed and interesting because of the teacher’s monotonous teaching style. As a result, students’ interest in learning mathematics is low. To overcome this problem, the teacher must design a mathematics learning strategy in the form of a mathematics learning tool in the form of a learning implementation plan and a student worksheet based on Realistic Mathematics Education (RME). Because the RME-based learning approach starts from ‘real’ things for students. This type of research is development research with the Plump model consisting of the preliminary research phase, the prototype phase and the assessment phase. In this study researchers were only at the initial investigation stage, namely at the student analysis stage. The purpose of this study was to increase students’ interest in learning mathematics. The instrument collection for initial investigation data was observation sheets, questionnaires and interviews with data analysis techniques namely descriptive techniques. The results of the initial investigation of the analysis of learners found that the interest in learning mathematics in vocational secondary school students is very low.
Device Learning Based on Realistic Mathematics Education for Students Tenth Grade of Vocational High School in Hospitality and Tourism Services Program Skill
Authors: Handayani W , Armiati A 
Published: May 2020

Abstract
This study aims to discuss a draft RME-based math learning tool for the students of tenth grade vocational high school of hospitality and tourism services program skill. This study is part of a research model development Plomp. This research only to the preliminary stage of research is the analysis of needs and learners. Data analysis in this study uses an interactive analysis model that consists of data collection, data reduction, data presentation, and drawing data conclusions. The instruments used in this study were interview and questionnaire guidelines. The analysis shows that devices made by teachers are universal to all membership programs and not pay attention to the character of each program skill.
The Analysis of The Junior High School Student’s Characteristic in the Development of Mathematics Learning Device Based on Quantum Teaching and Learning Models
Authors: Pratama Y S , Syarifuddin H , Armiati A 
Published: May 2020

AbstractThis research has aimed to develop a math learning device based on Quantum Teaching and Learning model for seventh-grade students. The learning device which is developed involves learning implement plan and student’s worksheet. The development model which was used in this research is Plomp model. This research only until prototype development, which discuses character analysis of students during the learning process occurs. In learning with Quantum Teaching and learning device, learners study in a group and discuss to understand the concept, so this activity could facilitate the characteristic of learners whose like to have a group and have a discussion. The finding of this research is expected to increase learners to study mathematics and become more active in the learning process.