By taking the role as a mentor and a facilitator, a teacher in the 4 th grade of elementary school needs to look at the condition of the students in the concrete thinking stage. Learning process needs to be adjusted such that the abstract objects in mathematics can be represented through concrete objects as a bridge to enter the knowledge that the students already had, especially for the material of fraction. This research aims to analyze the achievement and the improvement of students' mathematics reasoning ability through the implementation of Indonesian realistic mathematics education (PMRI) approach. The research subject consisted of 51 students in the experiment group and 45 students in the control group which categorized into three levels (low, intermediate, and high). The result suggests that the achievement and the improvement of students' reasoning ability in the mathematics learning using PMRI approach are better than the conventional learning. AbstrakSebagai pembimbing sekaligus fasilitator, seorang guru di kelas 4 sekolah dasar perlu memperhatikan kondisi para siswanya yang berada pada taraf berfikir konkret. Proses belajar perlu disesuaikan sehingga objek abstrak pada matematika dapat "direpresentasikan" melalui benda konkret sebagai jembatan memasuki pengetahuan yang telah dimiliki siswa, khususnya terhadap materi pecahan. Penelitian ini bertujuan untuk mengkaji pencapaian dan peningkatan kemampuan penalaran matematika (KPM) siswa melalui penerapan pendekatan pembelajaran pendidikan matematika realistik Indonesia (PMRI). Subjek penelitian terdiri dari 51orang kelas eksperimen dan 45 orang kelas kontrol yang terbagi menjadi tiga level (rendah, sedang dan tinggi). Hasil penelitian menunjukkan pencapaian dan peningkatan KPM siswa pada pembelajaran matematika dengan pendekatan PMRI lebih baik dari pembelajaran konvensional.

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In the era of big data and internet of things (IoT) revolution, it is possible to observe some variables for an object in real time, e.g. sensor data obtained from one or more sensor devices. In addition to extrapolate these data simultaneously, the other hot issue is how to use these data for classifying some variables into some groups, respectively. Multivariate time series classification (MTSC) analysis provides various models to represent this problem according to its characteristics. In this paper, we tried to summarize state-of-the-art methods for MTSC analysis complete with their strengths and weaknesses. Furthermore, we also focused on some limitations from previous research for developing MTSC analysis in the future.

Background. Speckle tracking echocardiography (STE) using dedicated high-resolution ultrasound is a relatively new technique that is useful in assessing myocardial deformation in 3 myocardial layers in small animals. However, comparative studies of STE parameters acquired from murine are limited. Methods. A high-resolution rodent ultrasound machine (VSI Vevo 2100) and a clinically validated ultrasound machine (GE Vivid 7) were used to consecutively acquire echocardiography images from standardized parasternal long axis and short axis at midpapillary muscle level from 13 BALB/c mice. Speckle tracking strain (longitudinal, circumferential, and radial) from endocardial, myocardial, and epicardial layers was analyzed using vendor-specific offline analysis software. Results. Intersystem differences were not statistically significant in the global peak longitudinal strain (−16.8 ± 1.7% versus −18.7 ± 3.1%) and radial strain (46.8 ± 14.2% versus 41.0 ± 9.5%), except in the global peak circumferential strain (−16.9 ± 3.1% versus 27.0 ± 5.2%, P < 0.05). This was corroborated by Bland Altman analysis that revealed a weak agreement in circumferential strain (mean bias ± 1.96 SD of −10.12 ± 6.06%) between endocardium and midmyocardium. However, a good agreement was observed in longitudinal strain between midmyocardium/endocardium (mean bias ± 1.96 SD of −1.88 ± 3.93%) and between midmyocardium/epicardium (mean bias ± 1.96 SD of 3.63 ± 3.91%). Radial strain (mean bias ± 1.96 SD of −5.84 ± 17.70%) had wide limits of agreement between the two systems that indicated an increased variability. Conclusions. Our study shows that there is good reproducibility and agreement in longitudinal deformation of the 3 myocardial layers between the two ultrasound systems. Directional deformation gradients at endocardium, myocardium, and epicardium observed in mice were consistent to those reported in human subjects, thus attesting the clinical relevance of STE findings in murine cardiovascular disease models.

The ability to use practical tools for students is a must in the basic Physics practical courses. In fact often happens is not adequate for laboratory tersediannya the implementation of practical, so that the process of teaching being constrained. To like the other problems like this needed a media device such as a software-based virtual lab simulations that can be used in the teaching of basic physics. This research aims to analyze the exact effort that can be done to overcome the lack of sedian laboratory equipment. This type of research is research use approach to the study of literature. The expected results of this literature is the emergence of an understanding of basic physics lab course in conducting with virtual laboratory as a means to address the issue of sedian in the real Labs. This virtual lab so that it can be the right solution for students and teachers in carrying out practical work.   Abstrak Kemampuan menggunakan alat-alat praktikum bagi siswa merupakan suatu keharusan dalam mata pelajaran Fisika Dasar. Pada kenyataannya yang sering terjadi adalah tidak tersediannya laboratorium yang memadai untuk pelaksanaan praktikum, sehingga proses praktikum menjadi terkendala. Untuk mensiasati permasalahan seperti ini dibutuhkan sebuah media seperti perangkat software laboratorium virtual berbasis simulasi yang bisa digunakan dalam praktikum  fisika dasar. Penelitian ini bertujuan untuk menganalisis upaya yang tepat yang dapat dilakukan untuk mengatasi ketidak-sedian  peralatan  laboratorium. Jenis penelitian yang gunakan adalah penelitian dengan pendekatan studi literatur. Hasil yang diharapkan dari literatur ini adalah munculnya pemahaman dalam melaksanakan praktikum fisika dasar dengan laboratorium virtual sebagai sarana untuk mengatasi persoalan ketidak-sedian laboratorium secara nyata. Sehingga laboratorium virtual ini dapat menjadi solusi yang tepat bagi siswa dan guru dalam melaksanakan praktikum. Kata kunci: Praktikum, Ilmu Sains, Laboratorium Virtual, Pemahaman Konsep

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On a tour activity, travel time estimation is needed so that the travel itinerary goes according to the plan. Travel time estimation is very important so we can estimate the time needed to arrive at the destinations in the travel itinerary. Therefore we need a method that can estimate travel time from one place to another. In this study, we propose the k-Nearest Neighbors Regression (kNN-Regression) method with Tensorflow to construct an estimation model. The proposed number of features in our estimation model is 8 features, i.e. zone information, time information, day information, weather information, temperature information, wind speed information, humidity information, and precipitation information. The data obtained from travel information from Ngurah Rai airport to Kuta Beach using GPS and weather information using weather application in real-time. We divide our data into two groups: a historical group consisting of 177 data and a testing group consisting of 51 data. In the testing stage, kNN-Regression will find the historical data closest to the testing data, so that the estimation value of the travel time of some testing data is not much different from the value of the nearest historical data. As a result, our proposed model gives the Mean Absolute Error (MAE) of 2.196078, Root Mean Square Error (RMSE) of 2.977036294 and accuracy rate 88.1819%.