bluuebunny/crossref_metadata_2025_split huggingface dataset:
Resistance training‐induced improvement in exercise tolerance is not dependent on muscle mass gain in post‐menopausal women
Authors: de Oliveira Júnior Gersiel Nascimento , de Sousa Jairo de Freitas Rodrigues , Carneiro Marcelo Augusto da Silva , Martins Fernanda Maria , Santagnello Samarita Beraldo , Orsatti Fábio Lera 
Published: July 2020

ABSTRACTMenopause transition may impair muscle function, decreasing exercise tolerance. The torque–duration relationship (hyperbolic curve) forms a practical framework within which exercise tolerance may be explored. In this regard, resistance training (RT) increases the curvature constant of this relationship (W′). Muscle hypertrophy and strength gains have been suggested as possible mediators of RT‐induced improvement in W′, however, it is unclear what the main mediator is. Higher‐volume RT (HV‐RT), beyond that recommended by RT‐guidelines (i.e. three sets per exercise), may promote greater hypertrophy, but not higher strength gains. Hence, this study aimed to investigate whether greater hypertrophy in HV‐RT maximises W′ gain when compared to LVRT in postmenopausal women (PW). Fifty‐eight PW were randomised to the control group (CTRL), HV‐RT (six sets per exercise) or LV‐RT (three sets per exercise). They underwent a 12‐week RT program and were assessed for W′, thigh lean body mass (TLBM) and maximal isometric voluntary contraction (MIVC). The TLBM gain was higher (P < 0.001) in the HV‐RT (9.4%) than LV‐RT (3.7%). However, both HV‐RT and LV‐RT similarly increased MIVC (9.7% vs. 16.5%, P = 0.063) and W′ (26.4% vs. 34.6% P = 0.163). Additionally, the changes in W′ were associated with the changes in TLBM (31%, P = 0.003) and MIVC (52%, P= <0.001). However, when the changes in TLBM and MIVC were inserted into the predictive model, only the MIVC (33%, P = 0.002) was a predictor of W′. Thus, although HV‐RT promoted greater hypertrophy than LV‐RT, HV‐RT does not seem to maximise W′ in PW.
Lung cancer detection using the SOM-GRR based radial basis function neural network
Authors: Wutsqa D U , Farhan A 
Published: July 2020

Abstract
This study intends to detect lung cancer using chest X-ray. We propose the SOM-GRR based radial basis function neural network (RBFNN) model. The self-organizing maps (SOM) based deals with unsupervised learning and the global ridge regression (GRR) based deals with supervised learnings that are carried out in developing RBFNN model. The gray level co-occurrence matrix (GLCM) extraction is performed to obtain the features of chest X-ray which are used as RBFNN input variables. We consider thirteen features, namely contrast, correlation, energy, homogeneity, sum entropy, variance, inverse difference moment, sum average, sum variance, entropy, difference entropy, maximum probability, and dissimilarity. The best model is obtained by evaluating its performance in training and testing data sets. The RBFNN model yields 93 % and 88 % accuracy in training and testing data sets, respectively.
Implementation Tabu search algorithm for optimization distribution LPG
Authors: Wati E , Fauzan M 
Published: July 2020

Abstract
PT. Kuda Mas Perkasa is a distributor company engaged in the distribution of non PSO LPG. The routes of distributing LPG at PT Kuda Mas Perkasa, is currently still intuitive so it does not provide optimal benefits. So, shortest LPG distribution route solution is needed. One of the optimal route problem-solving methods is the Tabu Search Algorithm, this method has the advantage of producing an optimal solution without getting stuck in repeating the same solution in subsequent iterations. The purpose of this study is to find the shortest route CVRP problem with the Tabu Search Algorithm. How the Tabu Search Algorithm starts with determining the initial solution using Nearest Neighbour, evaluating moves using the 2-Opt, Relocated, and Exchange methods, updating the Tabu list, then when the stop criteria are fulfilled the Tabu Search algorithm stops, if not, then returns to move evaluation. By using the Tabu Search Algorithm, the total distance travel by the truck is 146.62 km. Based on the results of the study, concluded that the completion of the distribution route using the Tabu Search Algorithm produces an optimal solution.
The implementation of Mamdani fuzzy inference system (FIS) method for decision making to choose direct and transit airline types in Indonesia
Authors: Hendiyani N , Suseta B , Kurniasari Y , Abadi A M 
Published: July 2020

Abstract
Choosing the type of airline tickets is determined by several factors, including types of direct or transit flights, ticket prices, facility and travel time. The purpose of this research is to determine the decision to purchase the direct and transit type airline tickets. In this research, the data were collected from Yogyakarta-Jakarta (Round Trip) amounted 93 and Yogyakarta-Medan (Round Trip) amounted 21 travel routes. This research used Mamdani fuzzy method with the following steps, determining the membership function of each input variable, determining the fire strength for each type of plane ticket, and determining Mamdani fuzzy inference system max-min. The results show that the highest electability for direct airline ticket types is Batik Air - Garuda (Round Trip) ticket type with the ticket price is IDR 1,501,200, facility score is 60 and travel time is around 140 minutes. While, the highest electability for transit tickets is Garuda - Garuda (Round Trip) with the ticket price is IDR 6,169,400, facility score is 60 and travel time is around 615 minutes.
Stability analysis of endemic equilibrium points on cancer cells mathematical model
Authors: ‘Arifah H , Lestari D , Sari E R 
Published: July 2020

Abstract
The purposes of this study are to find out an endemic equilibrium point and to analyze it. The pattern of the spread of cancer cells can be modeled in the form of differential equation systems. The research obtained asymptotically stable endemic equilibrium point. Based on simulation results, the greater the rate of cancer growth, the faster the cancer spreads and is present in the cell.
Comparing bio-inspired heuristic algorithm for the mean-CVaR portfolio optimization
Authors: Setiawan E P 
Published: July 2020

Abstract
Risk aversion parameter is a coefficient that denotes the trade-off between the risk and the return in an optimal investment. This coefficient had widely used to modify the mean-variance portfolio optimization procedure. In this study, we develop become a mean-CVaR optimization problem with risk aversion. We investigate the usage of several biological-based heuristic algorithms such as genetic algorithm, grasshopper optimization, firefly optimization, moth flame optimization, particle swarm optimization, grey-wolf optimization, and dragonfly optimization to solve this portfolio optimization procedure. Empirical study with Indonesian Stock data show that the Grey-Wolf Optimization yields better performance than the others.
Comparing k-nearest neighbor and k-means methods for clustering Indonesian farmers’ welfare
Authors: Pawa L V , Kismiantini  
Published: July 2020

Abstract
A farmer’s welfare classification can be performed to accommodate all significant issues that will assist policymakers, government, and scientists. This study aims to compare K-Nearest Neighbor (K-NN) and K-Means methods for clustering Indonesian farmers’ welfare using the fifth wave of Indonesia Family Life Survey (IFLS 5) data. The K-Means method is an unsupervised learning algorithm by classifying the data according to the closest distance between observed and centroids. The K-NN method is a supervised learning algorithm by classifying most of the nearest neighbour data. This study used fifteen factors affecting farmers’ welfare including land area, type of water, type of rice, income, expenditure, loan, mobile phone use, harvest frequency, crop failure, land ownership, gender, age, level of education, home ownership, and ownership of health insurance. The K-NN performed well to classify farmers’ welfare as the K-Means methods in the district data, with an accuracy of 89.8% compared to 53.7%. The K-NN classification results in provinces data showed that the provinces of Bali, East Java, South Kalimantan, Lampung, West Nusa Tenggara, South Sulawesi, and South Sumatra were included as prosperous provinces; while the provinces of Banten, DI Yogyakarta, West Java, Central Java, West Sumatra, and North Sumatra were included as non-prosperous provinces.
Modified capital asset pricing model (CAPM) into sharia framework
Authors: Subekti R , Abdurakhman  , Rosadi D 
Published: July 2020

Abstract
This study is to expose the sharia concept in the Islamic market, especially on the practice of the equilibrium model or the Capital Asset Pricing Model (CAPM). Islamic index and sharia market are introduced to answer the Islamic investment. However, we cannot apart from the interest rate, which is related to ‘riba’ and prohibited in Islam religion. Many references proposed the Islamic theory into the CAPM, so the model has been modified and adjusted to deliver the new solution on sharia investment. We provide a general illustration to explain how the sharia concept in CAPM as an equilibrium model and its implementation in Jakarta Islamic Index (JII). The result shows that the range of return is various, while the risk both beta and standard deviation have remained steady. The result shows that the Sharia version with the Sukuk rate performs better than the others from the expected return.
The instrument for mathematics National Examination (UN) try out of Junior High School at Makassar City, South Sulawesi. Are there any revisions?
Authors: Surni E Z , Retnawati H 
Published: July 2020

Abstract
Try out is an assessment form organized by the school and related parties before the implementation of national examination (UN) in Indonesia. By trying out, schools can conduct evaluations regarding the ability and readiness of students to face the UN. This research aims to determine the quality of the test instrument for UN mathematics try out of one of Junior High Schools at Makassar City, South Sulawesi. It can later be used as a revision basis. This is a descriptive-explorative type of quantitative research. The data is the test instrument and participant’s answers, collected by documentation. The instrument is validated by the experts, and its quality is analyzed using the classical test theory approach. The results of the research indicate that the test instrument has Aiken index value of 0.854 which means that the test instrument has high validity for all items. The reliability coefficient of 0.82 means that the instrument has very good reliability. There are 11 difficult items, 14 items having a weak discrimination category and 4 items having ineffective distractor. The Items must be followed up by revising.
How do Indonesian elementary school mathematics textbooks introduce fractions?
Authors: Rahmawati T , Pangesti S R , Nuriadin I , Kurniasih M D , Purnomo Y W 
Published: July 2020

AbstractThis research aimed to analyze and describe the approach that was used to introduce the concept of fractions in elementary school mathematics textbooks. There were six 3rdgrade of elementary school mathematics textbooks that represented two curriculums which were the 2006 curriculum and the 2013 curriculum that were included in the analysis. Vertical analysis of textbook research was conducted to focus on how the concept of fractions was introduced in the textbooks for each curriculum. The results of the research indicated that all the books included in the analysis only used one construct of fractions, which was as part-whole, to introduce fractions. This could cause the students to be narrow-minded about fractions and its implementations for further materials and in everyday life. Further discussion about the results can be seen in this article.
How good are the characteristics of the mathematics national standardized school examination items in vocational school?
Authors: Fathin A Z , Retnawati H 
Published: July 2020

Abstract
National Standardized School Examination is one of the exams used to determine the graduation of vocational school students. This study aims to determine the characteristics of mathematics National Standardized School Examination items in 12th Vocational School. This research is a descriptive explorative quantitative research. The data used is the mathematics National Standardized School Examination kits at a vocational school in the city of Yogyakarta and participant’s answers collected with documentation. These assessment kits are validated by experts and analyzed its characteristics using the classical test theory approach. The results of the study indicate that content validity obtains the Aiken index value (V) of 0.94, which means that this instrument is very valid for all items. Reliability for this instrument is categorized as a medium with a reliability coefficient of 0.3623. The results of the characteristic analysis showed that 18 items are having moderate difficulty, and there are 17 difficult questions. Based on the discrimination index, there are 6 items included in the good category, and the other 19 items are categorized as not good. Furthermore, in terms of the effectiveness of the distractors, this instrument can be said to be effective because 82.86% of the items have effective distractors.
Guardian high school student’s conception about mathematics as sensible
Authors: Sholli A K , Lukito A , Setianingsih R 
Published: July 2020

Abstract
One of the characters that students should hold as the effect of learning mathematics is positive character about mathematics. It means students believe that mathematics is sensible. Students who view mathematics as sensible think that mathematics is interrelated concepts and mathematics is related to other concepts. Students’ conception may be different because basically human have different personalities. There is a relation between student conception about mathematics and their personality type. One of the personality type based on Keirsey Temperament Sorter is guardian. This study describes guardian high school student conceptions about mathematics as sensible. One female student whose personality type is Guardians is purposively selected as a research subject. The subject is assigned a mathematics real world problem and interviewed based on the problem solving task to measure her conception about mathematics as sensible. The interview guideline is developed based on SCOMAS framework. The result indicates that guardian subject shows the conception that mathematics is sensible. However, not all of the indicators can be verified. The subject plans a strategy and alternative strategy to solve the problem, explains the way to solve the problem and the reason of applying some concepts, and connects the solution to the real situation. The subject doesn’t show the activity of seeking connection among mathematics concepts.
The final semester test of mathematics subject in vocational high school, how difficult is it?
Authors: Krisma D A , Retnawati H 
Published: July 2020

Abstract
Progression, result, and completeness of student learning can be assessed through a final semester assessment. In order to make a good assessment, the quality of test items is needed. This study aimed to describe the characteristics of the final semester test items used in “Indonesia” Yogyakarta Vocational High School. This study was a quantitative research with explorative descriptive type. The data obtained from the set of mathematics final semester test items used in grade XI “Indonesia” Yogyakarta Vocational High School along with student response. Documentation was applied for data collection. The set of test items was validated by 3 experts and its characteristics were analyzed with classical test theory. The results showed that the content validation is 0.82 invalid categories. Coefficient reliability is 0.77 at a reliable degree. Test items that have easy difficulty level are 4 items, the medium difficulty level are 21 items, and the difficulty level is difficult as many as 4 items. Item discrimination on item test showed that 21 items are included in the good category and 8 items are not good. The distractor of multiple-choice items worked effectively.
Problem-solving with guided inquiry learning: An analysis of student’s problem-solving ability
Authors: Afiyati Y , Warniasih K , Utami N W 
Published: July 2020

Abstract
Mathematics problem solving is one of the goals of mathematics instruction. The learning process influences mathematics problem-solving. This research aims to know the mathematics problem-solving ability with guidance Inquiry learning process. The research method was descriptive qualitative. Data resource were students of class VII A at Junior High Islamic School 4 Kulon Progo, Yogyakarta, Indonesia. The subjects of this study consisted of 6 students who were divided into three groups, namely the top group, the middle group, and the under group with each consisting of 2 students. The obtained data was in the form of written and spoken with the technique of problem-solving ability test and interview. Data analysis was carried out through data reduction, data display, and conclusion. Data validation used source triangulation. The result showed that student of the high class could reach the entire indicators with criteria of problem-solving ability was very high. The student of the middle class was not able to reach the indicator of looking back with criteria of problem-solving ability was high and enough. The low-class student was not able yet to reach the indicator of understanding the problem, devising a plan, carrying out the plan, and not able to looking back with criteria of problem-solving ability was enough.
Improving students’ reflective thinking skills and self-efficacy through scientific learning
Authors: Noer S H , Gunowibowo P , Triana M 
Published: July 2020

Abstract
The learning process with scientific learning focuses on students’ abilities in observing, questioning, associating, experimenting, and communicating. This current study aimed to determine the effectiveness of scientific learning in terms of Problem Based Learning (PBL) and Guided Inquiry Learning (GIL) in improving students’ reflective thinking skills and self-efficacy. This research was an experimental study with the subject population of all eighth-grade students of junior high school in Bandar Lampung. The samples of the study were students from two selected schools representing high-rank schools and middle-rank schools. The sample was chosen by purposive random sampling technique. The research design is a pretest-posttest control group design. The data were obtained through mathematical reflective thinking skills test and self-efficacy scale. The data were analyzed quantitatively and qualitatively to obtain a comprehensive description of the impact of learning on improve in both skills. The results showed that (1) student’s mathematical reflective thinking skills in PBL and student’s mathematical reflective thinking skills in GIL were higher than student’s mathematical reflective thinking skills in conventional learning, (2) student’s self-efficacy in PBL and student’s self-efficacy in GIL were not different from student’s self-efficacy in conventional learning. Therefore, it can be concluded that scientific learning effective to improve students’ mathematical reflective thinking skills but it has not meaningful contributions to improving students’ self-efficacy.
Hypothetical learning trajectory and students’ understanding of the concepts of the arithmetic sequence
Authors: Lestari Th V D , Marsigit  
Published: July 2020

Abstract
A teacher’s role is to facilitate students in understanding knowledge in each learning. An ideal learning process is inseparable from the process of learning planning. The teacher needs to develop a lesson plan. Hypothetical Learning Trajectory (HLT) is a benchmark in the implementation of learning to anticipate every response given by the students in every learning problem. This study aims to prepare the students’ Hypothetical Learning Trajectory on Arithmetic Sequence and make the anticipation of teacher’s responses to the alleged students’ answers occurring in learning Arithmetic Sequence. The preparation of the HLT is a part of design research. This research focuses on the first stage, namely the preliminary design. The results of this study are in a form of HLT about the number patterns of the Arithmetic Sequence consisting of learning objectives, learning activities, and hypotheses of students’ learning processes. The teacher’s responses to each student’s answer is different. When students have not been able to answer the problem correctly, the teacher can ask several directing questions that lead students to the expected answers. HLT can be used to facilitate teacher to knowledge development of the designed learning activities by paying attention to the development of students’ way of thinking.
Elementary school teachers’ perceptions of STEM: What do teachers perceive?
Authors: Laksmiwati P A , Padmi R S , Salmah U 
Published: July 2020

Abstract
At the moment, educational issues are developing and rapidly increasing. One of the examples is the integration of Science, Technology, Engineering, and Mathematics called STEM. In Indonesia, STEM is a relatively new concept that is booming with potential. In the mathematics classroom, teachers have to facilitate students exploring STEM activities in the learning process. In response to this, SEAMEO Regional Centre for QITEP in Mathematics has embarked its programme through training and research. This paper reports on a study that investigated what teachers perceive about STEM Education which can support STEM education practices. Moreover, this article explains integrative nature of STEM activities provided. The STEM activities designed are related to the concept of resilience in bungee jump (Science) and proportional relationships between quantities (Mathematics). A survey method has been chosen in this study and data were collected using Likert-scale questionnaires and interviews. The results of this study provide an understanding of teachers’ perceptions of STEM which includes teachers’ pedagogical needs and teachers’ readiness in the STEM implementation. These findings suggest that teachers have positive perceptions on the STEM integration in the mathematics learning. There are some recommendations that intensively STEM trainings for teachers, learning resources in the STEM integration, pedagogical supports from Indonesia Ministry of Education, and textbooks that provide STEM-related projects are needed.