bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parameter estimation for high dimensional classification model on colon cancer microarray dataset
Authors: Abapihi Bahriddin , Mukhsar  , Adhi Wibawa Gusti Ngurah , Baharuddin  , Lumbanraja Favorisen Rosyking , Faisal Mohammad Reza , Sani Asrul 
Published: May 2021

AbstractIn classification problems, logistic regression is among powerful techniques for discrimination. It provides directive probabilities of sample classification and interpretable coefficients. When it comes to model high dimensional dataset, however, logistic regression with its Newton-Raphson method of parameter estimation is no longer applicable, especially on low sample size and extremely high dimension. By applying cross-entropy algorithm on regularized logistic regression, it was able to well performing parameter estimation and highly accurate classification result.
Advanced hill cipher algorithm for security image data with the involutory key matrix
Authors: Supiyanto  , Mandowen S A 
Published: May 2021

Abstract
The security of important and confidential data is a top priority. Therefore, it is necessary to secure appropriate data to ensure confidentiality. Secrecy of data security can be done by randomizing the data in order to make the data is difficult to understand by anyone. One of the data security techniques that can be used is Advanced Hill Cipher cryptography. The purpose of this research was to create an application or software used to secure an image’s data by applying the Advanced Hill Cipher algorithm. A classic cryptographic technique, which use a matrix as a key in the process of encrypting and decrypting data with the type of key used is the symmetric key type. The data used in this study was an image data, while the application development used the language of MATLAB Programming. The method used in this study was the Advanced Hill Cipher Cryptographic Algorithm. Basically the Advanced Hill Cipher Cryptography algorithm is much more like the Hill Cipher algorithm. However, on Advanced Hill Cipher, algorithms are developed using a key matrix that always has inverse; so that the disadvantages of the hill cipher algorithm are that the key matrix does not always have inverse resolved. In this research, the key matrix used is a 2x2 order involuntary matrix with integer elements. The output of this study is anapplication that can be used to encrypting and decryptinggrayscaleand color image data with key matrix that always have inverse.
An automated cognitive analysis model for online asynchronous discussion
Authors: Tenriawaru Andi , Rahman Abdul 
Published: May 2021

Abstract
Evaluation of students’ cognitive abilities needs to be done as part of evaluating student learning outcomes. This evaluation must not only be done in conventional learning, but this must also be done in online learning. Evaluation of students’ cognitive abilities can be done through cognitive evaluation of messages posted by students in online asynchronous discussion. There are several studies that have addressed the problem of evaluating students ‘cognitive abilities in on-line learning, but the process of identifying students’ cognitive abilities in these studies has not been fully automated. There are parts of the identification process still carried out by humans. This study proposes a model that can produce classification automation of cognitive levels of messages posted by students in online asynchronous discussion. The messages used in this study are messages written in Indonesian. The proposed model consists of four main processes, namely the process of creating corpus, extraction and selection of features, classifier and training development, and testing. This model can help lecturers to identify cognitive levels of messages. The proposed model is expected to improve the performance of evaluation systems of e-learning learning.
Application of Cauchy-Schwarz inequality method for resolving constrained optimization problems at classroom with formal pre-operational phase of thinking
Authors: Samparadja Hafiludin , Agusu La 
Published: May 2021

Abstract
The optimization problem is a mathematical problem that is introduced at the junior high school level. Material related to optimization has even been introduced for elementary school levels in students with a level of concrete operations, especially for students who are prepared to take part in the Math Olympiad. The problem arises here, is that complicated methods for finding solutions to optimization problems, such as the simplex method, ordinary differential equations, partial differential equations, and the Lagrange multiplier were only introduced in high school or in college. To bridge this we need a special method that is easily understood by students participating in the pre-Olympic who are at the level of formal preoperative cognition, one of these methods is called the Cauchy-Schwarz inequality method. The Cauchy-Schwarz inequality is a powerful tool for finding the maximum and minimum solutions for a target equation with one or two constraint equations. The interesting thing is that the prices of the optimum manufacturing variables are reached when the Cauchy-Schwarz equation is fulfilled.
Synthesis of Precipitated Calcium Carbonate (PCC) as a Raw Paramagnetic Material Based on Ferrite-Calcite (Fe-CaCO3) and Its Potential Application
Authors: Nurhayati N , Sujiono E H , Zharvan V , Saleh M , Awiseng A T , Nursetya M F 
Published: May 2021

AbstractPrecipitated calcium carbonate (PCC) has been conducted by solid-liquid-gas route process. The PCC powder was prepared from limestone from lime powder contain dolomite as raw material and 0.5 M of glucose solution. The PCC powder then characterized using XRD to identify the phase and FTIR to identify the functional group. Further analysis shows that the PCC have one major phase CaCO3with peak characteristic at 2θ = 29.3°also the FTIR spectra shows the presence of CaCO3at 871.70 cm−and 1397.23 cm−.
Investigating the effect of pyro-catalytic temperature on gasoline production from low density polyethylene (LDPE) plastics waste
Authors: Jahiding M , Rizki R S , Hasan E S , Mashuni  
Published: May 2021

Abstract
This research aims to produce hydrocarbon fuels from LDPE plastic waste by the pyro-catalytic method. Pyro-catalytic of LDPE samples was carried out at 400, 425, 450, 475, 500, 525 and 550 °C, heating flow rate of 15 °C/min with zeolite catalyst. Fuel-oil quality analysis includes: density, viscosity, heat value, and hydrocarbon compounds using Gas Chromatrography-Mass Spectrometry(GC-MS). The pyro-catalytic process at temperatures of 400, 425 and 450 °C did not produce fuel oil, while at 550 °C it produced wax, so that the analysis of the quality of fuel-oil was not carried out. At pyrolysis temperatures of 475, 500 and 525 °C, respectively: bio-oil yield 8.4; 25.6; 46.5%; viscosity 0.81; 0.75; 0,84cP, density 0.750; 0.764; 0.756 g/mL and the caloric value of 11,403; 11,421; 11,338 kcal/kg.GC-MS spectrogram analysis of fuel-oil obtained the highest gasoline (C5-C12) content at pyrolysis temperature of 500 °C which was 81.31%.Based on the physical characteristics and percentage of the gasoline compounds content, this study recommends the production of fuel-oil from pyrolysis LDPE with zeolite catalytic done at a temperature of 500 °C because it is in accordance with fuel characteristics standards according to the American Standard and Testing Materials (ASTM).
Implementation Development Teacher Certification Program in Universitas Negeri Makassar
Authors: Khaeruddin  , Annas S , Awi  
Published: May 2021

Abstract
The pedagogic competence being tested is the integration of pedagogical concepts into the learning process of the field of study in the classroom. Meanwhile, the professional aspect is the basic competence in the field of study tested in accordance with the academic qualifications of the teacher, namely the ability of the teacher to plan and implement the learning process. Related to that, the results of this TCT could be influenced by several factors, including the quality of the input for Teacher Certification Program (TCP) implementation in the Institute of Teachers’ Education (ITE), the quality of the TCP implementation process in the ITE, the quality of the output of TCP implementation in the ITE, the internal quality assurance system for the Study Program organizing TCP in the ITE, and the TCP implementation model in the ITE. Therefore, it is necessary to study the input, output, process, Internal Quality Assurance Standards, and the implementation model of MIPA TCP in ITE.
A Development of IPA (Natural Sciences) Learning Tools Based on Investigative Approach in Empowering Students’ Higher-Order Thinking Skills and Concept Mastery in Junior High School
Authors: Danial M , Yunus M , Syamsir M , Rahmania  
Published: May 2021

Abstract
The major objectives of this research were to produce valid, practical, and effective learning tools of IPA subject which are able to empower higher-order thinking skills (HOTS) and students’ concept mastery in junior high school. There are several specific aims such as: 1) obtaining IPA learning tools for seventh grade students of junior high school in terms of investigative, potential and effective ‘acid-base’ materials to be implemented in the subject learning process for empowering students’ higher-order thinking skills and the concept mastery and 2) obtaining IPA learning tools in the form of investigative lesson plans (RPP), Student Worksheet, and Student’s Book for junior high school. This research applies research and development design, where development is carried out with reference to the 4-D model in particular define, design, develop, and disseminate. As for the research subjects, it involved 64 students and four IPA teachers which was conduceted at a junior high school in Makassar that is SMPN 36 Makassar. In connection with it, the stages of the research are defining, designing, developing, and disseminating which focus to obtain valid, effective and practical learning tools. As as result, this research: (1) produces investigative IPA learning tools which are valid, practical, and effective for junior high school; (2) obtains the learning tools’ validity level as 3.84 which is classified as strongly valid, the practicality level of teachers’ responses aspect as 91.28 with positive response category, the implementation level as 1.83 with implemented category, and the ability to manage learning as 3.63 with excellent category; and (3) the level of effectiveness for critical thinking skills as 85.17 with high category, problem-solving ability as 74.50 with high category, and concept mastery as 82.78 with high category, and the percentage of learning completeness as 85.41% with very high category. Thus, this research produces a valid, practical, and effective IPA learning tools in empowering students’ higher-order thinking skills and the concept mastery of ‘acid-base’ materials for junior high school.
Conceptual Thinking Profile of Mathematics Education Department Female Student in Solving Problems
Authors: Hamda  , Ketut Budayasa I , Lukito Agung 
Published: May 2021

Abstract
This research described the conceptual thinking of female student in solving math problems. The research subject was a female student of Mathematics Education who had the upper middle category of mathematics ability. This research was an exploratory research with a qualitative descriptive approach. The data were collected through problem solving tasks and in-depth task-based interviews. The validity of the data was done through continuous observation, time triangulation, and member check. Data analysis was carried out through several stages, namely data categorization, data reduction, data presentation, data interpretation, and conclusions. The results showed that in understanding the problem, the female student made symbolic and pictorial representations separately. She mentioned the concept while drawing. In making plans, the female student’s strategies were based on certain concepts and were related to problem questions, so that the plan of solving steps was not yet complete. In implementing the plan, the female student determined the initial steps for solving certain concepts that can be resolved and linked them to the problem questions. She did the problem solving partially based on the relationship between concepts, so that the problem solving steps were less systematic.
The Mathematical Proof Steps of Mathematics Study Program Students in the Subject of Real Analysis
Authors: Minggi I , Arwadi F , Sabri  
Published: May 2021

Abstract
the present paper describes the second year-research entitled the learning trajectory on mathematical proof of the students majoring in mathematics education. It applies the product of the first-year research namely the framework of the learning trajectory of mathematical proof and the design of its means in the topic of the real number system and the real number sequence. The present research aims at obtaining the mathematical proof steps in the learning trajectory which has been already set in the first-year research. Design research was determined as the research method aimed at, according to Gravemeijer (2013), developing a Local Instruction Theory (LIT). The LIT is expected to improve the quality of learning by developing the sequence of activities and understanding the empirical phenomena about how something works. In this research, the steps of mathematical proof were hypothetically designed i.e., (1) understanding the statement which will be proved, (2) deciding to choose either direct proof or indirect proof, (3) writing the proof specifically, and (4) verifying the validity of the proof. After the activities had been applied, retrospective analysis was undertaken to identify whether the stages were in line to the learning trajectory set in the first-year research. The learning trajectory itself includes: (a) proof with simple procedures of which the proof of a statement is done with single thinking procedure, (b) existential proof covering existential proof and non-existential fact or concept, (c) proof with complex thinking procedure, and (d) proof through construction, The findings suggest that the steps of the previously hypothesized proof occur with a support which is called scaffolding by visualizing a diagram of proof as the guide for writing the proof and there are still difficulties of writing the proof symbolically and describing mathematical argument which relates each step of the proof process.
Students’ Factual Understanding on the concept of Limit
Authors: Arsyad N , Ramadhana Y. , Assagaf S. F. 
Published: May 2021

Abstract
This research aims to describe the factual understanding of the concept of the formal definition of limit. This is a descriptive qualitative research with 8 students. The data gathered by using test and interview. The instruments is a conceptual understanding test. We divide the factual understanding into three main concepts: (1) students’ understanding on the symbol of ε and δ in the definition, (2) students’ understanding on the meaning of the absolute value in the definition, and (3) students’ understanding on the implication statement in the definition. Each elaborate to some categories to get the ideas on how students understand about the concept. The results reveals that most students have incomplete understanding about the definition of limit function.
Teachers’ Content Knowledge (CK) Analysis and Students’ Performance on Fractional Materials: A Case Study in Al-Amien Prenduan Foundation School
Authors: Wijayanti P , Kutub A H W , Fardah D K , Ismail  
Published: May 2021

Abstract
Fractions is one of the richest and most complex mathematical topics in mathematics learning. This is caused fraction topics is being one of the difficult topics in learning mathematics. Therefore, this study aimed at analyzing Teachers’ Content Knowledge and Students’ Performance on fraction topics. This research is a qualitative descriptive study which is a case study of Teachers’ Content Knowledge and Students’ Performance on fractional materials at the Al-Amien Prenduan Foundation School, Sumenep, Madura, East Java, Indonesia. Data were taken from 29 students of 7th grade and 2 teachers who taught these students. The instrument used in this study was 3 fraction problems. Data collection techniques are carried out using tests and in-depth interviews to obtain information in detail. The results of this study are the similarity of the patterns found in students’ and teachers’ performance on fraction topic. Teachers deliver the concept of fractions by emphasizing on students’ performance that is procedural rather than students’ understanding. These methods result in students learn fractions by memorizing them so that misconceptions can occur.
A Learning Design Analysis of the Pre-service Teachers’ Mathematics Pedagogical Content Knowledge
Authors: Fiangga S , Khabibah S , Amin S M , Ekawati R 
Published: May 2021

Abstract
A number of international assessments result in Indonesian students’ low achievement in mathematics. One substantial factor that affects to the inadequate achievement is the quality of the mathematics teachers. In 2007, teacher certification was launched by the government concerning the improvement program for teachers’ qualifications. Nevertheless, the program still struggling to foster the teachers’ quality. One fundamental aspect that constitutes to the teachers’ qualification is a Pedagogical Content Knowledge (PCK). This study aims to analyze the pre-service teacher PCK from the designed learning materials. This content analysis uses the learning materials which are the final product developed by the pre-service mathematics teachers. The framework from both Maher et.al. and Chick et.al. are used for analyzing the Clearly PCK categorization. Document analysis was used to obtain the data. The result suggests that pre-service teachers lack the ability to consider the students thinking and their misconception to develop effective teaching strategies.
Development of Learning Tools Using Remote IoT Labs with Blended Learning Method in The Department of Engineering Education
Authors: Purnamawati  , Mangesa R T , Ruslan  , Idhar  
Published: May 2021

Abstract
Learning is a process that involves educators, students, teaching materials, learning resources, learning media, and methods. The conventional method, whose main source of knowledge is only from educators, is considered to be less effective if it is the only source of knowledge transfer to students. The boring learning process, the media used in Digital Electronics courses is a simulator, the features presented in the simulator are less interesting. So it was appointed a research study on the development of the IoT Remote Lab learning tool with Blended Learning Digital Electronics Subjects in accordance with the Industrial Revolution era 4.0. This study aims to determine the stages and feasibility of developing the IoT Remote Lab learning tool with a valid, practical, and effective Blended Learning method in the Department of Electronics Education Faculty of Engineering Universitas Negeri Makassar (FT-UNM). The research method used by Research and Development (R&D) with the 4D development model (1), (2) planning, (3) development, and (4) distribution. The results of this study indicate that the Remote Lab IoT learning tool with the Blended Learning method has a very valid category to use. Got a response from students who said it was very practical in its use and the results of student test scores after implementation had increased. It was concluded that the data stated that the Remote Lab IoT learning device with the Blended Learning method that had been developed was declared valid/feasible to use as well as practical and efficient in its use.
Using HTML-Based Worksheet to Support Students in Active Mathematics Learning
Authors: Nasrullah  , Alimuddin  , Talib Ahmad 
Published: May 2021

Abstract
This developmental research aims to create an HTML-BW application. This technology is an alternative that serves to support teacher teaching activities and student learning. By utilizing this technology, the stimulus and response principles will work interactively. There are five students from SMA Unismuh Makassar getting engaged to be observed during the process of research. In terms of research instruments and data collection, this study applies three kinds of research instruments, such as HTML-Based worksheets, observation sheets, and response sheets. To support the interactive principle to be achieved, this application was built with due observance of guidelines, learning support, and values. Then so that it can be seen this research asks users to respond to directing user understanding, good learning media, media that supported learning activities, media that supported interests, and including modern media. The results of their opinion poll showed that this device was dominantly responded positively for the five things. Overall, it shows that HTML-BW is very supportive of active learning because it utilizes the stimulus-respond principle in its use. In other words, HTML-BW will direct teachers and students to engage in interactive activities.
Analysis of the Weakness to The Implementation of Online Learning During the Covid-19 Pandemic In the City of Surabaya, Indonesia
Authors: Raharjo  , Suparmi M 
Published: May 2021

Abstract
The aim this research to get an information of weakness/obstacles faced by the Education Office of Surabaya, in implementing online learning programs in Pandemic Covid 19 era. The data source is the result of stuffing questionnaire by Principal and Teachers of Elementary and Junior High School in the city of Surabaya, which consists of 37 782 teachers. Data obtained from the results of this study concluded that the implementation of the online learning is still not optimal and the need to increase both from the aspect of quantity and quality.
The development of integrated textbook cooperative learning model to improve learning outcomes and practice literation skills
Authors: Indana S , Susantini E , Bashri A 
Published: May 2021

Abstract
In facing the challenges of education in the 21st century, education is expected to lead students to learn cooperatively (learning to live together) by using literacy skills in order to solve problems. The purpose of this study is to produce an integrated textbook of cooperative learning models to practice literacy skills. The biology material used in this textbook is virus material in X grade. The development of this textbook implements the 4-D model development steps. Textbook implementation in class using the Posttest-Only Control Increased student learning outcomes data were obtained through daily test score, while the literacy skills data were obtained through the assignments score that practiced literacy skills. The results of implementation on classes that use integrated textbooks of cooperative learning models on virus topics show the Daily test score and assignments score are better when compared to the control class. The average value of student assignments in the class using teaching material is 76.88 while the value of students in the class without using teaching material integration of innovative learning models is 72.73. It can be concluded that the integrated textbook of cooperative learning models developed can improve student learning outcomes and literacy skills.