A CROSS-CURRICULAR APPROACH TO SPORT AND MATHEMATICS BY MEANS OF ICT

Students are usually more motivated to work in a sport class than in a math class. This research combined both subjects into one class. A combined class with a cross-curricular approach was introduced in the 6th year of primary school. Three teachers, who teach sport and math in the 6th grade, jointly planned a lesson for refreshing the students' knowledge of basic geometrical concepts. To raise students' motivation for work, tablet computers were used in the class, and the Geogebra, Actionbound and Socrative applications. In the combined class, students had to use their bodies to illustrate different geometric notions. A symbol was chosen, and the students had to use sporting equipment to, by means of a relay, act out this symbol using their interrelationships. They had to pay attention to all the little details which are also important when drawing in a notebook. It was anticipated that recognizing geometric notions after that lesson would be at a higher level than before. The Socrative application was used at the end of the lesson to get a feedback on better understanding of the subject and to identify the positive effects of the cross-curricular approach. Keywords: cross-curricular approach, ICT, primary school, useful knowledge

A Comparative Study of Models for Monocular Depth Estimation in 2D Images

Monocular depth estimation has been a challenging topic in the field on computer vision. There have been multiple approaches based on stereo and geometrical concepts to try and estimate depth of objects in a two-dimensional field such as that of a plain photograph. While stereo and lidar based approaches have their own merits, there is one issue that seems recurrent in them, the vanishing point problem. An improvised approach to solve this issue involves using deep neural networks to train a model to estimate depth. Even this solution has multiple approaches to it. The general supervised approach, an unsupervised approach (using autoencoders) and a semisupervised approach (using the concept of transfer learning). This paper presents a comparative account of the three different learning models and their performance evaluation

Cusp-based geometric height-oriented repair of a pediatric aortic valve

Progressive aortic regurgitation can occur in pediatric patients due to root dilation with conotruncal anomalies or cusp prolapse associated with a ventricular septal defect. It is treated using various approaches influenced by personal preferences and institutional experience. We applied geometrical concepts developed for adult aortic valve repair to pediatric valves. The basal ring and sinotubular junction are downsized in relation to the geometric height of the cusp by external suture annuloplasty. The length of the cusp free margin is then adjusted with central plication, guided by measuring the effective height of the cusp. This approach facilitates the reproducibility and predictability of pediatric aortic valve repair.

Localization and steric effect of the lone electron pair of the tellurium Te4+ cation and other cations of the p-block elements. A systematic study

A simple method has been developed based on pure geometrical concepts to localize lone pairs (LPs) of cations of the p-block elements and model their steric effect. The method was applied to 1185 structures containing LP cations in 2439 non-equivalent positions. For oxide crystal structures, it is observed that, going from bottom left to top right in the periodic table, LPs move away from the cation core and decrease in size. For a given kind of cation M*, the LP radius increases linearly with the M*–LP distance, the smallest rate being observed for Tl+ and the largest for Cl5+. The influence of the anion type was also studied in the case of the Te4+ cation. Overall, the same trends were observed. The smallest Te–LP distances and LP radii are found for anions of large size and small charge.

Pendalaman Konsep Geometri dan Pembuatan Media Pembelajaran Bagi Guru-Guru SD Kota Soe

This Activities is based on the previous analyzes about the performance of teachers in understanding geometry concepts. These results reveal facts about the difficulty of teachers in understanding and teaching geometry conceptually. Based on these findings, the aims of these activities were of deepening understanding of concepts and training teachers to teach geometry conceptually. This activity is focused on five sub-activities, namely: a) refreshment of geometrical concepts; b) repaired teacher’s misconceptions about geometry; c) reinforcement of teachers' understanding of the concept of geometry; d) enrichment; and e) the making and practice of using instructional media to overcome the difficulties of teachers in teaching conceptual geometry to their students conceptually. This activity went well, seen from the presence of the teachers to participate in activities that exceeded the initial target and based on the questionnaire distributed, 88.5% of participants stated that they were satisfied with this activity.

Peningkatan pemahaman konsep geometri melalui tahapan berfikir Van Hiele di SMP Negeri 8 Langsa

Understanding the concept is a benchmark students can proceed to the next stage in the learning process. Van Hiele's thinking stage is a solution to direct students to the actual concept of geometry. The purpose of this study was to determine whether there was an increase in understanding of the geometrical concepts of eighth grade students of SMPN 8 Langsa through Van Hiele thinking stages. This study used a One Group Pretest-Posttest Desaign research design. With a population of all eighth grade students of SMPN 8 Langsa, the sample was selected using a simple random sampling technique, namely grade VIII1 students. The instrument uses the ability to understand the ability of geometric concepts in the form of a description consisting of 6 questions. From the results of the calculation of the percentage of students understanding the concept of geometry shows an increase of 48%. The results of data analysis obtained that count> ttable is 12.59> 2.08, this means that Ho is rejected and Ha is accepted, so the conclusion obtained is that there is an increase in understanding of students' geometry concepts through the stages of van hiele thinking at SMPN 8 Langsa.

Malind-Papua Ethnomathematics: Kandara Musical Instrument as Learning Media for Geometry Concepts in Elementary School

Each regions has a local culture that is the identity of the area. The Malind (Anim Ha) tribe as the original tribe of Merauke has a musical instrument that has a copyright kandara. Kandara was used as a musical accompaniment of dances and songs at traditional ceremonies. Kandara can be used as a learning media for the concept of geometry in elementary schools. This article aimed to describe the instrument of the musical instrument as an ethnomatematics of the Malind-Papua tribe that can be used as a learning medium for geometrical concepts in elementary schools. It was qualitative research using the ethnographic approach. Sampling using a cluster random sampling technique. The results showed that, the first ethnomatematics were found in parts of the kandara such as the handle or hands of the kandara, head, bodyor middle part and the tail of the kandara. Secondly, the musical instrument of kandara can be used as a learning medium to explain the concepts of geometry in elementary school in the form of the concept of angles, flat shapes (triangles, rectangles and circles) and building spaces (incised cones and tubes). Thirdly, ethnomatematics can be a learning material in elementary schools based on local culture, not only can help students understand mathematical concepts well but also maintain and respect the cultures of local communities (Malind tribe as an indigenous of Merauke). Keywords: Ethnomathematics, Kandara, Learning Media, Geometry Concepts

PENINGKATAN PEMAHAMAN KONSEP GEOMETRI MELALUI TAHAPAN BERFIKIR VAN HIELE DI SMP NEGERI 8 LANGSA

Understanding the concept is a benchmark students can proceed to the next stage in the learning process and the stage of thinking Van Hiele is a good solution to direct students to the actual concept of geometry. Stages of thinking Van Hiele specializes in teaching geometry. There are three main elements in teaching geometry, namely time, teaching material, and the teaching methods applied. If the three elements are arranged in an integrated manner, they will be able to improve students' thinking abilities to the higher stages of thinking. The purpose of this study was to determine whether there was an increase in understanding of the geometrical concepts of eighth grade students of SMP Negeri 8 Langsa through the Van Hiele thinking stage. This research was classified into quasi-experimental research. This study uses a One Group Pretest-Posttest Desaign research design. The population in this study were all eighth grade students of SMP Negeri 8 Langsa. Samples were taken using simple random sampling technique and students of class VIII I were selected as sample classes. The instrument of this study is the ability to understand concept tests. This test was arranged in the form of a description consisting of 6 questions. From the results of the calculation of the percentage understanding of students' geometrical concepts showed an increase of 48%. The results of data analysis obtained that count> t table is 12.59> 2.08, this means that Ho is rejected and Ha is accepted, so it can be concluded that there is an increase in understanding of students' geometry concepts through the stages of van hiele thinking at SMP Negeri 8 Langsa. Keywords: Stages of thinking Van Hiele, Ability to understand concepts and Geometry.

KONFLIK KOGNITIF MAHASISWA DALAM MEMAHAMI KONSEP GEOMETRI HIPERBOLIK DAN ELLIPTIK

Using schemes of Euclid's geometrical concepts in long-term memory to understand hyperbolic geometry and elliptic geometry concepts with assimilation and accommodation allows for cognitive conflict. This study aims to reduce the occurrence of cognitive conflict by understanding the mathematical content of the three of Euclidean geometries, hyperbolic and elliptic. The research was conduct used descriptive exploratory. The results indicate that Euclid's geometry representation is still used in representing hyperbolic and elliptic geometry so that cognitive conflict occurs. Cognitive conflicts that occur are related to the position of two lines, parallels, two triangles with the same that correspond angles, intersects one of two parallel lines, the number of angles in a triangle, and Sacherri's valid hypothesis. The efforts that can be made to reduce the occurrence of cognitive conflict are to change existing schemes or create new schemes so that the information obtained can be combined into existing schemes in a deductive axiomatic approach to material content through the accommodation process

Studi Etnomatematika terhadap Para Pengrajin Payung Geulis Tasikmalaya Jawa Barat

AbstrakPenelitian dilatarbelakangi pertentangan opini mengenai hubungan matematika dengan budaya, yang mengarah pada ethnomathematics. Tujuan penelitian untuk mengetahui serta mendeskripsikan etnomatematika pada pembuatan Payung Geulis Tasikmalaya. Metode penelitian yaitu kualitatif dengan metode etnografi. Subjek penelitian dipilih melalui metode purposive sampling, yaitu tiga orang pengrajin Payung Geulis yang berada di Panyingkiran, Indihiang, Kota Tasikmalaya serta telah menjadi pengrajin selama lebih dari 10 tahun. Teknik pengumpulan data yaitu dengan observasi, wawancara dan dokumentasi. Instrumen penelitian yaitu peneliti sendiri dengan didukung beberapa instrumen lainnya yaitu pedoman observasi, pedoman wawancara, alat rekam dan kamera. Teknik analisis data yang digunakan dalam penelitian ini yaitu reduksi data, penyajian data dan menarik kesimpulan atau verifikasi. Berdasarkan hasil analisis data, disimpulkan bahwa terdapat kaitan antara Payung Geulis dengan matematika yang ditunjukkan dengan adanya unsur-unsur matematika berdasarkan konsep geometri. Konsep geometri tersebut diantaranya berupa geometri bangun datar, geometri bangun ruang, simetri, geometri transformasi (refleksi, translasi, dan rotasi) serta kekongruenan. Ethnomathematics Study of Payung Geulis Craftmans Tasikmalaya AbstractResearch is motivated by conflicting opinions about the relationship between mathematics and culture, which leads to ethnomathematics. This research aims to determine and describe ethnomathematics in the manufacture of Tasikmalaya Geulis Umbrellas. The research method is qualitative with ethnographic methods. The subjects in this study were selected using a purposive sampling method where the subject was a Payulis Geulis craftsman in Panyingkiran, Indihiang, Tasikmalaya City and had been a craftsman for more than 10 years. Data collection techniques used are observation, interview, and documentation. The research instrument was the researcher himself, supported by several other instruments, namely observation guidelines, interview guidelines, recording equipment, and cameras. Data analysis techniques used in this study are data reduction, data presentation and drawing conclusions or verification. Based on the results of data analysis, it was concluded that there is a relationship between Umbrella Geulis with mathematics which is indicated by the existence of mathematical elements based on the concept of geometry. The geometrical concepts include the geometry of the flat structure, geometry of geometry, symmetry, the geometry of transformation (reflection, translation, and rotation) and concordance.