bluuebunny/crossref_metadata_2025_split huggingface dataset:
Low-cost educational robotics for promoting STEM education
Authors: Abidin Z , Arifudin R , Hardyanto W , Akhlis I , Umer R , Kurniawan N 
Published: June 2021

Abstract
Robotics in education has been gaining attention from teachers and researchers in education. The use of robotics in education allows teachers to combine four disciplines, namely science, technology, engineering, and mathematics (STEM), to promote student learning simultaneously. With educational robotics, teachers can make science and mathematics concepts more concrete in a real-world context by combining technology and engineering altogether. This paper explores the designing process of educational robotics to promote STEM learning. Teachers were involved in designing and constructing robots. The “Big Ideas” exploration became an essential step to gather any insights from teachers on how robotics are built.
Development of postgraduate school’s digital library as a repository of digital collections
Authors: Abidin Z , Zulaikha I , Wicaksono D W , Umam K , Aulia A F 
Published: June 2021

Abstract
The development of information and communication technology offers advantages for library management. The ease of access to the internet makes it easy for us to access the library’s digital collection without any time and space limitations. Currently, many digital libraries have been developed in various universities to complement the existence of conventional libraries. This digital library’s presence can be a solution for traditional libraries to overcome existing limitations and constraints. This current study discusses how Universitas Negeri Semarang’s postgraduate school digital library is developed. The waterfall method and was used to guide systems development. This paper outlines how the digital library is used to give a portrait to the users of some features offered.
Knowledge management system in a higher education institution: Development of an expertise search system
Authors: Sugianto  , Abidin Z , Putra A T , Budiman K 
Published: June 2021

Abstract
Knowledge management constitutes determining factors for organisational effectiveness, organisational performance, and sustainable competitive advantage in higher education institutions (HEIs). HEIs create new knowledge through research works and community services, distribute knowledge through teaching and learning, and transfer knowledge through consultancies and scientific discussions. A knowledge management system (KMS) is considered essential for HEIs to facilitate knowledge management. This paper outlines the KMS development process of the Faculty of Mathematics and Natural Sciences of Universitas Negeri Semarang as a platform for advancing the faculty as an organisation. Data collections were conducted through forum discussions to gather information and identify current issues related to data used in KMS development. Some information technology experts, faculties, and top management staff were actively involved in the discussions. The obtained data were analysed and then applied in the system, namely the expertise database and conference database. The iterative model was employed as a guideline for the development of KMS. This model enables the developer to revisit the system once it needs to be updated in the future.
Analysis of TB epidemic model with relapse and treatment
Authors: Sutimin  , Herdiana R , Utomo R H S , Permatasari A H 
Published: June 2021

Abstract
Tuberculosis (TB) is an infectious disease becoming a serious health problem that causes mortality and morbidity. A model of Tuberculosis spread by incorporating the effect of relapse and susceptible from recovery individuals, as well as treatment is studied. The existence of endemic equilibrium is shown through the basic reproduction ratio. The analysis results show that the non endemic equilibrium is global stable if the ratio value is less than unity, the endemic equilibrium the global stable if the ratio value is greater than unity. The results of study show that the relapse factor affects in the decrease of healthy individuals, and treatment of chemoprophylaxis is more significant in preventing the spread of TB disease compared to therapy.
Forecasting retail sales based on cheng fuzzy time series and particle swarm optimization clustering algorithm
Authors: Ariyanto R , Tjahjana R H , Udjiani T 
Published: June 2021

Abstract
Use of the conventional forecasting method, which is based on trend data with average sales in the last few months, results inaccurate forecasting due to a large difference in data, this is the same as fuzzy forecasting with the same interval length or static. Therefore, this paper recommends using the Cheng forecasting method combined with the Particle Swarm Optimization (PSO) algorithm. We use an artificial intelligence, i.e., PSO algorithm to set non-static length of intervals each cluster on Cheng method. The comparison of this method yields a better root mean square error (RMSE) value for each cluster on the recommended method.
The total irregularity strength of caterpillars with odd number of internal vertices of degree three
Authors: Maulana M R , Rosyida I , Mulyono  
Published: June 2021

Abstract
Given a graph G consisting of vertex set V and edget set E, repectively. Assume G is simple, connected, and the edges do not have direction. A function λ that maps V ∪ E into a set of κ-integers is named a totally irregular total k-labelling if no vertices have the same weight and also the edges of G get distinct weights. We call the minimum number k for which G has totally irregular total k-labelling as total irregularity strength of G, ts(G). In this article, we construct labels of vertices and edges of caterpillar graphs which have q internal vertices of degree 3 where q is 5,7, and 9. We obtain the exact values of ts in the following: n + 2 if the caterpillars have q=5 internal vertices, n + 3 for q=7, and n + 4 for q=9.
Improving absorption of students with special needs by the use of Mathematical Multi-purpose Videos
Authors: Sugiman  , Suyitno A , Pujiastuti E 
Published: June 2021

Abstract
This article begins with a research collaboration between the Director of Seameo-Sen, based in Melaka Malaysia, and the Study Center in the Field of Learning for Students with Disabilities of FMIPA UNNES. The research objective to obtain the results of the analysis that revealed the use of the Multi-purpose Videos of Mathematical Teaching Aids to increase the absorption of students with special needs. The research method is with a qualitative approach. The subjects of this study taken one Malaysian Special School teacher, a Partner Researcher from Seameo-Sen, and the four of visually impaired and the mental retardation students at State Special School (SLBN) in Salatiga. Data analysis: data reduction, data presentation, data interpretation, and drawing conclusions, accompanied by class visit activities at SLBN Salatiga by applying Multi-purpose Videos of Mathematical Teaching Aids, interviews, Focus Group Discussion (FGD), and triangulation of data sources. As a result, by applying the Multi-purpose Videos of Mathematical Teaching Aids there was an increase in the absorption of SLB students. In conclusion, SLB needs to use Multi-purpose Videos of Mathematical Teaching Aids to increase the absorption of students with Special Needs in Mathematics.
Reverse optimization and capital asset pricing model in the application of the Black Litterman portfolio
Authors: Subekti R , Abdurakhman  , Rosadi D 
Published: June 2021

Abstract
In the application of the Black Litterman model on portfolio construction, the terms of reverse optimization and Capital Asset Pricing Model (CAPM) are often associated with the Black Litterman process. This study explains the Black Litterman model from two perspectives: reverse optimization and the CAPM formula. Two portfolios are built with different starting points and without any lambda difference as a risk aversion coefficient, a scalar tau, and views return in the Black Litterman strategy. Both models are applied in the Indonesian stock market, and the empirical comparison of both portfolios are demonstrated. The result shows that both approaches can build a portfolio using the Black Litterman with a similar weight allocation.
Reception of mathematics education and mathematics exercises program to increase intelligence quotient
Authors: Aurachman R 
Published: June 2021

AbstractIntelligence Quotient (IQ) and scholastic intelligence are believed to be of fixed value for each individual. Although some research has emerged in the field of neurology which states otherwise. IQ is an important factor that helps a person get a job and improve his career. Through this paper, a proposed program to increase IQ using mathematics education and mathematics exercises will be presented. It is hoped that in the future this program can be tested and implemented for many people in need. The research show that majority of student are interested to program which designed to increase IQ.
Optimization of Naïve Bayes uses the genetic algorithm for classification data
Authors: Salim A , Alfian M R , Andriani H , Afifah N 
Published: June 2021

Abstract
Classification is one of the statistical methods to classify data systematically. However, if there is a large amount of data and various features, it often results in low accuracy. For this reason, methods are needed that can handle the data with various types. One method that can handle this problem is Naïve Bayes. Naïve Bayes is one of the methods used for classification data. This method requires a stage of selection of independent variables in increasing the accuracy of the model from Naïve Bayes. So we need an excellent method to fix these deficiencies uses a Genetic Algorithm (GA). Genetic algorithm is one of the metaheuristic methods used in optimization techniques. The data used are septic tank data in East Surabaya with eleven independent for classification data. The result of classification accuracy using Naïve Bayes is 72.7%. When Naive Bayes was used with a genetic algorithm, the classification accuracy was increased is 90.9%
Mathematical literacy ability in terms of the independent learning students on reciprocal teaching learning models with approaching RME assisted by google classroom
Authors: Wesna M , Wardono  , Masrukan  
Published: June 2021

AbstractThe aim of this study is to determine the quality of the learning reciprocal teaching with approaching RME assisted by google classroom on mathematical literacy ability and describe mathematical literacy ability in terms of the independent learning students. This study uses a mixed-method. Subjects of this study were 8thgrade students of SMPN 7 Pontianak 2019/2020 school year. The subject of the study was based on the categories high independent learning, middle independent learning, and low independent learning. The results showed that the quality of reciprocal teaching-learning with the RME approach assisted by google classroom both qualitatively and quantitatively. Reciprocal teaching-learning of the planning and implementation categories included either. In the assessment phase, the ability of a mathematical literacy of reciprocal teaching achieve mastery learning and increasing categories included medium. Students in high independent learning can use all the indicators of mathematical literacy to the maximum. Students in the middle independent learning were able to use all indicators of mathematical literacy in a relatively long time. Students in the low independent learning enough in using indicators of mathematical literacy.
Dynamics of mathematical model interaction of living populations in making biogas as an alternative of renewable energy
Authors: Nugraheni K , Millah N , Soemarsono A R 
Published: June 2021

Abstract
Renewable energy which is often referred to alternative energy is needed as an alternative or substitute for conventional energy. Biogas is a type of energy source that comes from living things (plants and animals). Biogas is the most energy-efficient and environmentally friendly. Biogas as alternative energy has considerable potential to help reduce the use of fossil energy. One way to determine the effect of each aspect is to model it in mathematical language. Mathematical models represent the production of biogas by considering the interactions between living populations in making alternative renewable energy alternatives. The model is constructed as a nonlinear autonomous system with three dependent variables. After forming a mathematical model, dynamical behavior such as investigate the equilibrium point, a local stability analysis process is then carried out on the model. The numerical simulation will represent an illustration analysis results of the constructed model. The simulation results show the same stability analysis.
Spatial analysis of factors influencing Gross Regional Domestic Product (GRDP) in East Java: a spatial durbin error model analysis
Authors: Kholifia N , Rahardjo S , Muksar M , Atikah N , Afifah D L 
Published: June 2021

Abstract
Regression analysis is not always a suitable solution if the analyzed data contains spatial effects. In overcoming the spatial effect on the data, a statistical method that can overcome it is needed. Spatial regression is a method used for data that has a location effect. One of the spatial regression model that can be used is the spatial Durbin error model. Spatial Durbin error model can overcome the spatial autocorrelation relationship in the independent variables and overcome the spatial error between regions. Spatial effects influence the rate of economic growth in an area, so it is different in each region. The quality of economic growth is an essential indicator in measuring the welfare of an area’s people. The Gross Regional Domestic Product (GRDP) can measure the rate of economic growth. Many factors affect the size of the GRDP, including the total workforce, the number of industries, the number of labour, general allocation funds, regional revenue, and regional expenditure. This study uses the Spatial Durbin Error Model to model GRDP and map the level of economic growth in 38 districts/cities in East Java.
Temperature influences on dengue hemorrhagic fever mathematical model
Authors: Asih T S N , Kharis M , Syafa’atullah M F , Isfandari F 
Published: June 2021

Abstract
Dengue hemorrhagic fever (DHF) has been modeled as an epidemic model by looking at the interaction between humans and mosquitoes. The Aedes Aegypti mosquito is the primary vector of DHF. Its life is influenced by climatic factors, including temperature, humidity, rainfall, and rainy days. In this study, a model for the spread of DHF will be formed by paying attention to climatic factors, namely temperature. Previous studies have shown that temperature affects mosquito populations and the frequency of mosquito bites against humans. This model will modify the mosquito population growth rate and the frequency of bites, which are usually considered constant, to be a temperature function. Using the temperature data of Semarang, we simulate to evaluate the temperature influence on the dynamic of DHF. The analysis result giving the temperature domain for the equilibrium existences, and the simulation result show that temperature affects the time it takes to converge to the equilibrium point.
Guided discovery learning model with the teacher-student active learning approach, assisted by the WhatsApp solution alternative application on the COVID-19 pandemic
Authors: Sulistyo L , Kartono  
Published: June 2021

AbstractAll the Covid-19 pandemic has destroyed the normal activities of life on earth, including the education sector. As a professional educator, the Covid-19 pandemic disaster is a challenge to become the new normal in education. The internet is a vital tool for the implementation of online learning, the object of research is students of the 4th semester of electrical engineering study program UNISNU Jepara Indonesia with the Guided Discovery Learning model with the Teacher-Student Active Learning approach assisted by the WhatsApp application. Based on the results Mid-Semester Examination and Final Semester Examination, the SPSS calculation results show a positive correlation of 0.918, so it can be concluded that the Guided Discovery Learning model with the Teacher-Student Active Learning approach assisted with the WhatsApp application as a model and alternative learning approach for the Covid-19 pandemic and as a form of continuous learning online.
Implementation of problem based learning to improve students’ understanding of systems of linear equations in three variables
Authors: Sasmita S A , Qohar A 
Published: June 2021

AbstractBased on the observation result conducted by researchers in class X-IPA 1 of UM Laboratory Senior High School, it could be seen that most students were less active during the learning process. Then from the pretest result of concept understanding problem, it was obtained that 38.89% of the 36 students were in the low category and 16.67% of the 36 students were in the medium category. Therefore, an innovation in implementation of mathematics learning to overcome the students’ poor concept understanding is needed. This research aims to describe the implementation of problem based learning model that can improve students’ understanding of systems of linear equations in three variables learning in class X-IPA 1 of UM Laboratory Senior High School. This research type is Classroom Action Research. The research result showed that the students’ concept understanding experienced an improvement. The percentage of students who had a high and very high concept understanding from cycle I to cycle II increased from 50.00% to 94.44% of the number of students, while the percentage of students who had a low concept understanding from cycle I to cycle II was reduced from 19.44% to 2.78%.
Prototype of mathematics club module in a co-curricular activity for elementary students
Authors: Primasatya N , Imron IF 
Published: June 2021

Abstract
This article is a part of research on the development program of Mathematics Club as a cocurricular supporting program in a full-day school. The development procedure in this research uses the ADDIE method, but it lacked implementation due to the COVID-19 pandemic. This article specifically elaborates on the prototype of the mathematics club module and its procedure as a co-curricular activity in a full-day school. According to the initial observation, it is concluded that the cocurricular implementation in the full-day school is not optimal. This is because of a lack of school preparation in designing the co-curricular program and its auxiliaries. An alternative offered by researchers to overcome the problem is by designing the Mathematics Club program as well as its module as the teaching module. The mathematics club module displayed the experiment procedures on fraction lesson, to grasp the understanding of the fraction operations concept. The module was also supplied with media that can be used by the students in their experimental activities.
Mathematics literacy abilities and responsibility with realistic mathematics education learning based ethnomathematics
Authors: Wardono  , Mariani S , Kurniati C N 
Published: June 2021

Abstract
The results of observations at SMP Negeri 40 Semarang found that the sense of responsibility and mathematics literacy skills of grade VIII students was not optimal. The purpose of this study was to determine the mathematics literacy skills of students in the classroom using the ethnomathematics based RME to achieve classical completeness and the average mathematics literacy skills of students were better than the average mathematics literacy skills of students in classes using the expository learning model, to determine whether there was an effect of responsibility. towards students’ mathematics literacy. This research method is an experimental quantitative method. The population of this study were students of class VIII SMPN 40 Semarang in the academic year 2019/2020. The sample was taken by using cluster random sampling technique, it was obtained class VIII A as the experimental class and class VIII B as the control class. The results of this study indicate that (1) students ’mathematics literacy in the experimental class achieve classical completeness, (2) the average mathematics literacy skills of the experimental class students are better than the control class students’ mathematics literacy abilities, (3) there is significant influence of student responsibility on mathematics literacy abilities.
Analysis of mathematical creative thinking test instruments on open-ended problems with ethnomatematic nuances
Authors: Munahefi D N , Mulyono  , Zahid M Z , Syaharani E A , Fariz R 
Published: June 2021

Abstract
The purpose of this study was to analyze the mathematical creative thinking ability test instrument in open-ended problems with ethnomathematic nuances. The aspects that must be possessed in a mathematical creative thinking ability test instrument consist of: fluency, flexibility, originality, and elaboration. These four aspects are contained in open-ended questions. Open-ended questions are questions that can be worked on with several answers or various settlement strategies. Ethnomatematics applied to open-ended questions is batik. Batik that has various styles should be able to explore the mathematical creative thinking ability. The method used to collect data on mathematical creative thinking ability is the essay test method which consists of 5 items. The data analysis technique used is qualitative and quantitative data analysis. Qualitative analysis was carried out by examining the validity of the content. Meanwhile, the quantitative analysis was carried out by using the classical test theory approach which the calculations were assisted by the Microsift Excell program.
Students’ Creative Thinking Process in Solving Ill-Structured Problem at Eight Grade Students with High Ability
Authors: Firdausi Y N , Sujadi I , Nurhasanah F 
Published: June 2021

Abstract
Creativity and problem solving are important skills in facing 21st century, but students’ creativity in solving mathematics problem is various. Therefore, to improve students’ creative thinking, teacher have to know their creative thinking process. The purpose of this research is to describe the students’ creative thinking process in solving ill-structured problem at high-ability students. The research type is descriptive with qualitative approach. The subjects of this study were two high-ability students. Result of the research showed that in the preparation stage, high-ability students understand the problem well and collected the datas and informations known from the problems. In the incubation stage, they were silent for a moment; reread the information obtained from preparation stage; made an illustration from the problem; and recalled ideas from their prior knowledge. In the illumination stage, high ability students found another idea by analyze the previous idea, planned the problem solving carefully; connected mathematic ideas to the reality; and continued solve the problems use the idea obtained from the previous stage. In the verification stage, high-ability students rechecked the calculation; verified the ideas; and revised the invalid ideas.