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All Journal Prosiding Seminar Nasional Official Statistics Jurnal Kesehatan Kartika
Brian Wicaksono
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Humanities Computer Science & IT Economics, Econometrics & Finance Health Professions Medicine & Pharmacology Nursing Public Health Social Sciences Veterinary

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Analisis Perbandingan Hierarchical dan Non-Hierarchical Clustering Pada Data Indikator Ketenagakerjaan di Jawa Barat Tahun 2020 Umi Syafiyah; Dita Putri Puspitasari; Iqbal Asrafi; Brian Wicaksono; Finer Mayland Sirait
Seminar Nasional Official Statistics Vol 2022 No 1 (2022): Seminar Nasional Official Statistics 2022
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (309.337 KB) | DOI: 10.34123/semnasoffstat.v2022i1.1221

Abstract

The Covid-19 pandemic has had a significant impact on various sectors in Indonesia, including West Java Province. One of the affected sectors is the employment sector. West Java Province is the province with the highest Open Unemployment Rate (TPT) in Indonesia, after Banten Province. This is due to the increase in the labor force but not attributable to an adequate employment opportunity. The purpose of this study is to group regencies/cities in West Java Province based on employment indicators. In addition, this study also aims to present a comparison between the hierarchical cluster method, namely single linkage, average linkage, and complete linkage, and the non-hierarchical cluster method, namely k-means cluster. The results of the analysis show that the complete linkage method of 2 clusters is the most suitable method in grouping regencies/cities in West Java Province based on employment indicators. There are two groups formed based on complete linkage, namely: cluster 1 which consists of 18 regencies/cities with characteristics of good labor development and cluster 2 which consists of 9 regencies/cities is a cluster with characteristics of labor development that has not been maximized.
Uji Aktivitas Antioksidan Ekstrak Etanol, Fraksi Polar, Semi Polar Dan Non Polar Bunga Telang (Clitoria ternatea L.) Dengan Metode ABTS Brian Wicaksono; Diah Pratimasari; Novena Yety Lindawati
JURNAL KESEHATAN KARTIKA Vol. 16 No. 3 (2021): Jurnal Kesehatan Kartika
Publisher : LPPM Stikes Jenderal Achmad Yani Cimahi

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Abstract

Kandungan senyawa flavonoid dalam bunga telang (Clitoria ternatea L.) memiliki aktivitas antioksidan. Senyawa antioksidan dapat menghambat terbentuknya radikal bebas, dengan menyumbangkan satu atau lebih elektron. Penelitian ini bertujuan untuk mengetahui potensi aktivitas antioksidan ekstrak dan fraksi polar, semi polar dan non polar bunga telang (Clitoria ternatea L.) dengan metode ABTS sebagai langkah awal untuk mengetahui potensi tumbuhan herbal sebagai obat tradisional. Bunga telang dilakukan maserasi dengan etanol 96% selama 3 hari dan remaserasi 2 hari. Ekstrak kental dilakukan fraksinasi dengan pelarut n-heksan dan etil asetat berdasarkan like dissolve like. Uji aktivitas antioksidan menggunakan asam 2,2’-azino-bis-(3 etilbenzotiazolin-6-sulfonat) dengan mengukur aktivitas antioksidan terhadap radikal bebas ABTS yang ditandai penurunan intensitas warna dari radikal ABTS. Penelitian menggunakan standar kuersetin serta analisis hasil dengan Kruskal-Wallish. Hasil uji aktivitas antioksidan ekstrak etanol, fraksi n-heksan, fraksi etil asetat fraksi air menghasilkan IC50 sebesar 19,9741± 0,0180, 30,1265 ± 0,5030, 17,8659 ± 0,0010, 26,4522 ± 0,3914 dengan kategori sangat kuat < 50 µg/ml. Hasil Kruskal-Wallish menunjukkan terdapat perbedaan signifikan antara aktivitas antioksidan ekstrak etanol, fraksi n-heksan, fraksi etil asetat fraksi air (Sig) < 0,05.
Co-Authors Diah Pratimasari Dita Putri Puspitasari Finer Mayland Sirait Iqbal Asrafi Novena Yety Lindawati Umi Syafiyah