bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Time Effect based Collaborative Filtering Approach for User Preference Statistics and Recommendation
Authors: Chen Yuxi , Zhang Xiaotong , Zhao Qing , Akhtar Faheem 
Published: March 2020

Abstract
With the rapid development of the information technologies in the financial field, extracting meaningful information from a massive amount of data is hugely significant for efficient business decision making. The recommendation system is an intelligent system that applies historical knowledge of users to infer their preferences and make a personalized recommendation. However, it suffers from the problem of time effect of user’s behaviour, which means a user’s interests may change over time. To overcome this problem, we propose a time effect based collaborative filtering approach to adaptively statistics the change of user preferences. Firstly, Item-based collaborative filtering is used to calculate rating similarity between items. Since an Item-based collaborative filtering algorithm doesn’t consider the time effect; next, the time decay function is proposed to statistics the change of user interests. Experimental results show that the proposed scheme retained higher accuracy compare to traditional collaborative filtering method.
A Study of Country Economic Risks in Countries Along the Belt and Road: A Classification Method Based on DEA Sort
Authors: Zhou Yujie 
Published: March 2020

Abstract
Today, with the development of international trade and prosperity, the implementation of the Belt and Road strategy has brought a large number of international trades, international lending and cross-border investment business. In the process of business decision-making, the investigation of national economic risks is indispensable. To solve this problem, this paper adopts the idea of DEA Sort, selects relevant economic indicators, combines the input-oriented CCR multiplier model and cluster analysis to classify the national economic risks of sample countries, and finally obtains three classifications and the economic risks of most countries were found to be high. It is expected to provide reference for relevant cross-border business in the countries along the Belt and Road and relevant enterprises.
Research on Evaluation Model of College Students’ Mathematical Modeling Ability Based on Hierarchical Clustering Method
Authors: Qi Yuanhua 
Published: March 2020

Abstract
In order to make the evaluation of mathematical modeling ability more in line with the actual ability of college students, it is necessary to establish a scientific and objective evaluation method. Therefore, based on the hierarchical clustering method, this paper establishes the evaluation criteria of College Students’ mathematical modeling ability. Through the test, the application of this method can make a fair judgment on the mathematical modeling ability of college students, make the evaluation of the mathematical modeling ability of students more based by educational institutions, and also help students to provide useful guidance for personal learning progress. In addition, this method can guide teachers and researchers to carry out the work of mathematical modeling, and help them to cultivate more mathematical modeling talents.
A Self-Control Analysis Method of University Students Based on Campus Big Data
Authors: Ge Liang , Yu Jia , Zhou Qing , She Yanyun , Yuan Zhongwei 
Published: March 2020

Abstract
Nowadays, the analysis of university students is the main concern of educational institutions. In this paper, we investigate the problem of analysing students’ self-control ability. Our model focuses on the process of feature extraction, and then classification algorithms are applied. We propose the concept of behaviour chain to model the behavior of student. On this basis, we propose a spatial periodic feature extraction method based on the longest common sub-sequence(LCS). And we extract some statistics features from consumption data, access control data and others. Our model SCA(Self-Control Analysis) performs with the precision of 0.72, the recall of 0.78 and the Fl-score of 0.74. It means that it’s possible to analyse student’ self-control ability with campus big data.
The secrets of mindful STEM teaching and learning
Authors: White A L 
Published: March 2020

Abstract
The pressure upon a Science, Technology, Engineering or Mathematics (STEM) educators has increased as the demand for workers with STEM capabilities develops while worldwide the number of students electing to specialise in STEM areas is declining. In 2018, the Indonesian Ministry of Industry (KPRI) released a document titled ‘Making Indonesia 4.0’, stating STEM teachers will be expected to produce students who have several “careers” during their working lives and have the skills needed which includes technical capabilities, creativity and innovative problem-solving. This will occur in a context where the future of work remains human and so while the new technologies have the capacity to automate many tasks, they also create as many jobs as they replace. As well as these governmental expectations, STEM educators are being continually confronted with an avalanche of advice on the best ways of teaching and learning their subject. This advice comes from across the spectrum of expertise that includes parents, outstanding teacher heroes, commercial interests, and dubious ‘experts’ who have no pedagogical knowledge or experience. This paper will attempt to cut through this avalanche and dig down to the bedrock of successful and sustainable STEM teaching and learning. While this paper is written for all STEM educators, it will tend to favour examples from the mathematics and brain research disciplines.
Students’ mathematical communication in discovering the concept of graphs of trigonometric functions through instructional videos
Authors: Detiana  , Johar R , Mailizar  
Published: March 2020

Abstract
Mathematical communication is one of the critical aspects of learning mathematics. One way to improve mathematical communication skills is integrating technology in learning. The technology that can be employed is an instructional video, for instance, GeoGebra tutorial video. The video helps students discover the characteristics of graphs of trigonometric functions. Initially, students watched the instructional video before the lesson. In this way, they could imagine and illustrate the graphs of trigonometric functions. The purpose of this study was to describe students’ mathematical communication in discovering concepts of trigonometric function graphs at senior high schools through instructional videos. This qualitative study utilized observation, interviews and student worksheets as instruments. The researchers selected three students as participants and observed and analyzed their written and oral communication skills using rubric guidelines. Students’ worksheets and teacher’s note were used for data analysis. The results of this study found that by watching instructional videos, students were able to master the problems that contained all indicators of mathematical communication. It can be concluded that, generally, students’ mathematical communication skills were considered good. Finally, this study implied that instructional videos could be used as an alternative/innovation in learning to improve students’ mathematical communication skills.
Students’ mathematical reflective thinking ability through scaffolding strategies
Authors: Rahmi N , Zubainur C M , Marwan  
Published: March 2020

Abstract
Mathematics learning at school is not yet sufficient to support students’ mathematical reflective thinking ability. Students’ mathematical reflective thinking ability can be improved by facilitating students with proper learning strategies and giving feedbacks or assistance that can support mathematical reflective thinking. One of the intended strategies is a scaffolding strategy. Scaffolding can encourage and trigger students’ mathematical reflective thinking. This study was qualitative research aiming to describe students’ mathematical reflective thinking ability through scaffolding strategies. The subject of the study was 33 second grade junior high school students. Data for students’ mathematical reflective thinking ability were obtained through three subjects interviewed. Based on the result of the students’ reflective thinking test, each subject was then categorised into high, medium, or the low ability of mathematical reflective thinking. Data obtained from the interview was analysed to describe students’ mathematical reflective thinking ability. The result showed that, in general, students’ mathematical reflective thinking ability through scaffolding strategies were still low. All students achieved the reacting phase of reflective thinking ability; meanwhile, only a few students achieved the comparing and contemplating phase. Further study and research are needed to facilitate a better reflective thinking ability.
Improving students’ problem-solving ability and learning motivation through problem based learning model in senior high school
Authors: Hasrawati  , Ikhsan M. , Hajidin  
Published: March 2020

Abstract
Students’ problem-solving abilities and motivation to learn mathematics is still not as expected. Most students struggle with mathematical problems that are presented in the form of word problems and non-routine problems. The purpose of this study was to determine the improvement of students’ problem-solving ability and learning motivation using PBL model. This study used a quantitative approach with experimental research type. Analyses were carried out using two-way ANAVA test at a significance level of 0.05. The study proves that the improvement of the problem-solving ability of students who were taught using PBL model is better than the students who were taught using conventional learning with a t-count of 2.734 and sig. (1-tailed) = 0.004 (sig ≤ α). The results of the study also showed that the improvement in students’ learning motivation through the application of PBL model was better than those who were taught using conventional learning with a t-count of 1.364 and a sig. value (1-tailed) = 0.0095 (sig ≤ α). PBL model provides positive value for students’ problem-solving skills and learning motivation.
Students’ mathematics problem-solving skills through the application of Problem-Based Learning model
Authors: Suryani I , Maidiyah E , Salasi  , Mardhiah MZ 
Published: March 2020

Abstract
Education aims to foster a variety of potential which exists in human, including the potential to solve any problems, involving solving mathematical problems. This study aimed to describe students’ problem-solving skills during mathematics learning about social arithmetic through Problem-Based Learning (PBL) model. The subjects of this research were 32 Year 7 students in Banda Aceh. This study used a qualitative descriptive approach. Data collection was conducted by problem-solving skills test and interview. The interview data were analysed descriptively, while the data of the test results were analysed based on the assessment guideline of students’ problem-solving skills. It was found that students’ mathematical problem-solving skills through PBL model were already classified as good. High-achieving students of problem-solving skills solved the problem by understanding the problem, planning the solution, doing the solution and rechecking it. Middle-achieving students of problem-solving skills solved the problem by understanding the problem, planning the solution and doing the solution without rechecking it so they get incorrect results. Low-achieving students of problem-solving skills solved the problem by understanding the problem and planning the solution, yet they presented the incorrect solution and did not recheck it. PBL model can be used to improve students’ problem-solving abilities.
Elementary school teacher’s perspectives towards developing mathematics literacy through a STEAM-based approach to learning
Authors: Siregar Y E Y , Rahmawati Y , Suyono  
Published: March 2020

Abstract
This research aimed to investigate teacher’s views about developing mathematical literacy through a STEAM-based approach to learning. The study used descriptive, qualitative data collection through observation, questionnaires, and interviews. The study involved fifth-grade elementary school teachers who have educator certificates and are mathematics expert teachers in Banda Aceh. The results show that the teachers agreed that the STEAM Project should start from an elementary school level of skills necessary for the project, but they did not yet understand the STEAM Project concept as a multidisciplinary learning approach nor they have the knowledge needed to implement it. They argued that the procedural demands during the implementation of the project were confusing, resulting in the achievement of content material taking precedence over developing students’ mathematical literacy. They were also not used to connecting mathematics with the context of everyday life problems, so further guidance for teachers is essential for this approach to be successful. The results of this study are expected to provide teacher’s views about student mathematical literacy and STEAM Project so that it becomes a reference in facing challenges in the global scope.
The metacognitive ability of mathematics education program’s students
Authors: Arnis  , Zubainur C M , Abidin Z 
Published: March 2020

Abstract
The quality of learning outcomes is influenced by the ability of students to control their cognitive processes continuously and develop into metacognitive. Through the metacognitive process, students are expected to be able to motivate, organize, develop themselves to determine their goals and try to achieve the goals to make their learning and thinking processes more effective and efficient. This study aimed to determine the students’ metacognitive abilities of Mathematics Education Study Program in Tarbiyah and Teacher Training Faculty, UIN Ar-Raniry Banda Aceh. The type of research used a quantitative method. The population of the study were all student who took the subject of Field Geometry course in Mathematics Education Study Program, Tarbiyah and Teacher Training Faculty, UIN Ar-Raniry Banda Aceh. The sample was the students in one of the five classes taking the course. The instrument in this study was a problem-solving question. Data analysis was conducted descriptively using Analysis Score. The students have different metacognitive abilities in solving a mathematical problem-solving question. Three of the twenty-three students have high metacognitive abilities.
Students’ learning outcome through the implementation of guided inquiry learning model using Autograph
Authors: Ticaya  , Ikhsan M , Yusrizal  
Published: March 2020

Abstract
Innovations in learning mathematics using technology are needed to improve the students’ learning outcomes. This research aimed to investigate the students’ learning outcome through the implementation of guided inquiry learning model using Autograph in the trigonometric function graph at a senior high school in Aceh Besar, Indonesia. Quantitative approach employing experiment was used in this research. The research samples were Year 10 science students from class X as the experimental class taught with guided inquiry learning model using Autograph, and Year 10 science students from class Y as the control class taught with guided inquiry learning model without using Autograph. The research instruments were pretest and posttest consisting of four essay questions of trigonometric function graph. After the test requirement has been mett-test was conducted with a significant level of 0.05 to examine the improvement of students’ learning outcomes between the experimental and control class. The research findings indicated that the improvement of students’ learning outcome applying guided inquiry learning model using Autograph was better than those without it. The application of guided inquiry learning model using Autograph improved the students’ learning outcome.
Growth inhibition of acacia (Acacia nilotica) with seawater and shade
Authors: Djufri  , Hartini S , Pada A U T , Puspa V R 
Published: March 2020

Abstract
This research investigated the effect of the concentration of seawater (AL) and light intensity on seedling growth of A. nilotica. The research method used a randomized block design (RBD) factorial design with two factors. The first factor is seawater with 6 levels of concentration (AL 0%, 20% AL, AL 40%, AL 60%, 80% AL and AL 100%). The second factor is the shade with three levels of shade (55% NG, NG 65%, and 75% NG). The results showed: (1). Single factor shade and seawater has an inhibitory effect on the percentage of deaths tillers of A. nilotica, each treatment have different effects. The most effective combination inhibited A. nilotica growth was NG3AL5 (shade 75% and 100% concentration of seawater). (2). Seawater treatment affects the tissue organ damage of A. nilotica plants, especially roots and stems, therefore at 14 MST most of the test plants die for not being able to tolerate the treatment, (3). The analysis results of the soil physical and chemical parameters showed that no symptoms of poisoning the soil due to seawater treatment in the test medium, as shown by the high levels of every physical and chemical parameter of land far above the exposure limit.
Ehanol extract from Achantus Ilicifolius L. leaves as anti-inflammatory ulcers in Mus musculus L.
Authors: Rizeki E , Safrida S , Supriatno  
Published: March 2020

Abstract
This study aims to determine the effective concentration of Acanthus ilicifolius L. leaves to treat the number of ulcers and gastric ulcer severity in white mice (Mus musculus L.) which were induced 500 ppm of aspirin. The approach used was quantitative by using a completely randomized design (CRD) factorial pattern with two factors. The results of statistical analysis of the number of ulcers for factor A (source) show the value of Fcount>Ftable = 15>3.16, while factor B (concentration) shows the value of Fcount>Ftable = 64> 2.38 at the test level α 0.05. While the results of statistical analysis of factor A ulcer severity (Source) shows the value of Fcount > Ftable = 4 > 3.16 and factor B (concentration) Fcount > Ftable = 38 > 2.38 at the test level α 0.05. The highest percentage of treatment was at the concentration of P2 (250,000 ppm) and P3 (500,000 ppm) at 17%. The ability of gastric ulcer healing in mice is because the parts of the Achantus ilicifolius L contain several phytochemical compounds including flavonoids, saponins, alkaloids, phenolics, and terpenoids. Therefore, it can be concluded that the Achantus ilicifolius L leaves with a concentration of 250,000 ppm are effective in treating the number of gastric ulcer and ulcer severity in mice.
Content validity of conation assessment
Authors: Muliana N , Pada A U T , Nurmaliah C 
Published: March 2020

Abstract
Content validity reflects the representation and relevance of a set of items used to measure a concept carried out through rational analysis of the contents of the test through expert judgment. This validity refers to the accuracy of the measurement based on the contents of the instrument to ensure that the scale items used have met the overall concept content or suitability of the items. The purpose of this study is to evaluate the validity of the contents of the Conation-Based Instrument in High School Biology Learning and explain the procedure for calculating the coefficient values of each instrument item. Five experts validated the instrument in this study consisting of three biology education experts and two psychology experts. The assessment criteria assessed were based on construction and clarity, which are assessed on a 4-point scale. Data collection was carried out using the Aiken V. formula. The result, from 39 items, which had a content validity coefficient greater than 0.87 (26 items) and the rest (12 items) were discarded.
The implementation of project-based learning model to improve students’ learning outcomes
Authors: Syukriah S , Nurmaliah C , Abdullah A 
Published: March 2020

Abstract
This study aims to determine the improvement of students’ cognitive learning outcomes after the implementation of the PjBL model combined with PDEODE (predictdiscuss-explain-observe-discuss-explain). This research was conducted at several senior high schools in Banda Aceh from September to October 2018. The Pre-test post-test control group design was employed in this research. The total of 172 students was involved as subjects which was divided in to 2 groups (control and experiment). The students’ learning outcomes were measured by calculating gain normalization (g) and the Mann-Whitney test. The results showed a significant difference between control group and experiment group α =0.05, the value of Asymp. Sig. (2-tailed) 0.00<0.05. To concluded, the PjBL model combined with PDEODE has significantly improve the cognitive learning outcomes of students.
The implementation of problem-based learning module to improve the students’ learning outcomes and perceptions
Authors: Auly R , Mudatsir  , Evendi  
Published: March 2020

Abstract
The present study aims to increase students’ learning outcomes and to explore their perceptions of problem-based learning module of living organisms at MTsN 2 Aceh Jaya. The pre-experimental method with the one-group pretest-posttest design was used, and the purposive sampling technique was employed. The collection of data was performed on May–June 2019, and the study was conducted in class VIId. The research instruments include multiple-choices tests totaling 20 items and students’ perception questionnaire. For the data analysis, the N-Gain was utilized to see the improvement in learning outcomes and the t-test to examine the hypothesis of the implementation of PBL module. The Likert scale was used to analyze the data of student perception questionnaire. The results indicate that the implementation of the PBL-based module of living organisms interaction can improve the student learning outcomes with an N-Gain value of 0.57, which means the medium category, and tscore > ttable (14.92 > 2.042), and the students’ perceptions on the implementation of the PBL-based module of living organisms interaction are obtained to be an average of 60%, which is considered in good category.
The effect of antrophogenic noise on Sumatran Elephant’s anti-predator behavior in the Elephant Conservation Center
Authors: Abdullah  , Shabrina A , Khairil  , Saputri M , Syafrianti D , Ala N 
Published: March 2020

Abstract
The increase of human activity around forest area causes noise anthropogenic effect to animals. This long-term effect can lead to decrease behavior and impact on species composition and inter-species interactions. Sumatran Elephants are classified as endangered animal. This study aims to determine the effect of noise on the Sumatran elephant’s anti-predator behavior and the difference in behavioral response based on the difference noise exposure time. The observation was conducted to Sumatran Elephants in Elephant Conservation Center Saree, Aceh Besar District. Observation method was animal focal sampling technique. The data was analyzed using the chi square test with a significant level of 5%. Based on the results of the chi-square test, the value of sig is 0.000 or smaller than 0.05, indicate that there is an effect of noise toward anti-predator behavior. The observed Sumatran elephants also look more responsive to the noise that is sounded in the morning. Noise can interfere with prey perceptions of predators and correlate with increased energy use.