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All Journal BAREKENG: Jurnal Ilmu Matematika dan Terapan MATHunesa: Jurnal Ilmiah Matematika
Thomas, Abdiel Bellamy
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Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Energy Engineering Mathematics Mechanical Engineering Physics Transportation

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Clustering Analysis of Sales of Naruna Cups on Shopee Using the K-Means Method (Case Study on PT. Naruna Keramik Studio) Thomas, Abdiel Bellamy
MATHunesa: Jurnal Ilmiah Matematika Vol. 12 No. 3 (2024)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/mathunesa.v12n3.p681-689

Abstract

Naruna Keramik Studio is a company in Salatiga, Central Java that produces and sells various types of products made from clay. The products produced include plates, cups, teapots, bowls, cutting boards, spoons in various colors and other ceramic tableware products. Sales of Naruna products are also available on e-commerce platforms, one of which is Shopee. The large number of types of products produced causes stockpiling of several products because there are several products that are less desired by customers and the impact of COVID-19 as well. Therefore, companies need to group each product to determine which products are most desired and which products are undesirable. This grouping will be carried out using the cluster analysis method using K-Means Clustering. Cluster analysis is carried out by collecting the necessary data first, determining the number of clusters, and clustering using the K-Means method. It was found that cluster 1 contained 13 products, cluster 2 contained 2 products, and cluster 3 contained 5 products. The level of variable differences in the clusters formed from the Naruna cup product clustering process is relatively high.
DERIVATION ON SEVERAL RINGS Thomas, Abdiel Bellamy; Puspita, Nikken Prima; Fitriani, Fitriani
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 18 No 3 (2024): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol18iss3pp1729-1738

Abstract

Research on ring derivation is one of the studies that is quite popular among algebra lovers. The definition of the derivation on the ring is motivated by the derivation in calculus which has Leibniz's rule. The purpose of this paper is to show some of the derivation properties on several rings, namely divisor rings, cartesian product rings, and factor rings. Let be a commutative ring with multiplicative identity and A the set of multiplicative closed that has non-zero divisor. In this paper, we have shown some results of derivation on ring theory. If is a ring derivation of R and is a divisor ring of , we can construct for all , then the map is a derivation on . The concept of embedding one ring into another ring can be used so that the ring of constant of , namely , is a subring of the divisor ring . Related to the ideal on ring theory, if I is an ideal of R, then where is also a derivation on the ring . The last result in this paper comes from the ring of cartesian product, take be a ring with derivation for . The cartesian product ring have a derivation ring defined by for any .
Co-Authors Fitriani Fitriani Nikken Prima Puspita