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All Journal SITEKIN: Jurnal Sains, Teknologi dan Industri GRADIEN International Journal of Advances in Intelligent Informatics Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Journal of Applied Data Sciences LOSARI: Jurnal Pengabdian Kepada Masyarakat TRIBUTE: JOURNAL OF COMMUNITY SERVICES
Ulfasari Rafflesia
Department Of Mathematics, Faculty Of Mathematics And Natural Science, University Of Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Mathematics Physics Public Health Social Sciences Transportation Other

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PENERAPAN UJI T-BERPASANGAN UNTUK MELIHAT PENGARUH PEMBINAAN SISWA DALAM MENGHADAPI PERSIAPAN LOMBA OLIMPIADE MATEMATIKA Ulfasari Rafflesia; Pepi Novianti; Dian Agustina; Idhia Sriliana
DHARMA RAFLESIA Vol 12, No 1 (2014): JUNI
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v12i1.3418

Abstract

ABSTRACTBengkulu is an active participant in the National Science Olympic competition in junior level. But the achievement of Bengkulu’s students is not prominent, especially in the fieldof Mathematics. Until now Bengkulu has never been quite encouraging achievement in theOSN. Department of Mathematics University of Bengkulu has a human resource that ispromising, the competent faculty who can nurture, guide, and prepare students of SMPNegeri 2 Bengkulu to compete in the OSN. Therefore, students of SMP 2 Bengkulu will becoached to understand, analyze and answer the questions, so that they know the mathOlympic the strategy and the ways that fast in answering the Olympics questions correctly,so they will be a champion at the provincial and national competition. After coaching isdone, it can be concluded that this activity has not been a significant influence. However,development activities that have been implemented are able to provide the knowledge andinsight to junior high school students about the material and questions in math Olympic.Keywords: SMP Negeri 2, Math Olympic, paired T-test
PEMBERDAYAAN KELOMPOK TANI DESA SAMBIREJO MELALUI PENGOLAHAN SAMPAH TERPADU GUNA PENYEDIAAN ENERGI ALTERNATIF DAN PENINGKATAN PENDAPATAN KELUARGA Lusiana Lusiana; Evi Maryanti; Ulfasari Rafflesia
DHARMA RAFLESIA Vol 14, No 1 (2016): JUNI
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v14i1.4288

Abstract

Community services activity group on empowerment of farmers group in sambirejo trhrouh integrated process of waste to energy alternative and improvement of family income have been done. This activity aims to improve the welfare of the villagers in sambirejo especially members of Amanah Farmer Group and Makmur Jaya Farmer Group through community based integrated waste. In this activity, training of garbage separation of organic and inorganic, making organic fertilizer/compost with Takakura method, making handicrafts from plastic packaging waste and biogas installation which is expected to produce alternative energy to replace LPG and firewood for daily cooking. The implementation of these activities carried out by two methods : (1) counseling and discussion about separating domestic waste, products can be made from waste, and what types of waste can be used, (2) demonstration and practice on how to make compost with Takakura method, and biogas installations on both partners. Through these activities are expected to members of the two groups of farmers, especially the women will be able to sort household waste properly and process the waste into products which has economic value that can create small-scale domestic industry that would be able to contribute to the family and the environment. Keywords: Farmer’s Group, Waste, Takakura, Plastic Pack, Economic Product
UPAYA MENINGKATKAN KEMAMPUAN BERHITUNG SISWA SEKOLAH DASAR KELAS IV DENGAN METODE JARIMATIKA Ulfasari Rafflesia; Idhia Sriliana; Pepi Novianti
DHARMA RAFLESIA Vol 15, No 1 (2017): JUNI
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v15i1.4230

Abstract

Community service activity aims to introduce and teach counting method of finger (jarimatika) as an alternative method of counting to complete the multiplication operation on the fourth grade students at SD Negeri 79 Kota Bengkulu. Counting method can be used to improve student learning outcomes in completing multiplication operations. This method can provide visualization of counting process, cheer up the child, not burdening the memory of the brain, and the tool is always taken. In addition, this method will make learning activities more fun so that the students become eager in learning. Based on the results of the dedication activities undertaken, it can be concluded that this activity is able to provide knowledge and skills to students of Class IV SDN 79 Kota Bengkulu about jarimatika method. Almost all students are very enthusiastic and interested in following this guidance activity although this jarimatika method is relatively new to them. In addition, this activity can improve students learning motivation and improve students’ numeracy skills especially in multiplication operations. Keywords: Counting, Jarimatika, Mathematics
Analysis of Seismic Data in Sumatra using Robust K-Means Clustering Rafflesia, Ulfasari; Rosadi, Dedi; Sari, Devni Prima; Novianti, Pepi
Journal of Applied Data Sciences Vol 6, No 1: JANUARY 2025
Publisher : Bright Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/jads.v6i1.523

Abstract

Indonesia is located within the Pacific Ring of Fire and frequently experiences significant seismic activities, rendering the region susceptible to hazards. Specifically, Sumatra is an island in the western part of the country, near the Eurasian and Indo-Australian tectonic plates. Over the past five years, an observable uptick in seismic events has been recorded in Sumatra. This research aimed to cluster the Sumatra region’s seismic data using the k-means algorithm and its extensions, including trimmed and robust sparse k-means, to determine the characteristics and patterns of seismic events. The k-means clustering algorithm operates effectively on many data but needs to work better in the presence of outliers. Meanwhile, the data identification reports the presence of outliers in the seismic data. The clustering analysis identified two main clusters, supported by multivariate and spatial outlier detection during preprocessing. The first cluster, encompassing 62% of seismic events, is located offshore near the Mentawai seismic gap, characterized by shallow depths (33–41 km) and magnitudes of 4.5–5.0 Ms. The second cluster, representing 28% of events, includes both mainland and offshore regions, associated with the Sumatran Fault system and slab deformation zones, at moderate depths (54–154 km) with magnitudes of 4.3–4.4 Ms. Rare deep-focus events exceeding depths of 214 km were identified as outliers. Evaluation using Silhouette, Davies-Bouldin, and Dunn indices determined that k=2 was the optimal number of clusters. This study contributes by integrating robust clustering methods to handle outliers, enhancing the reliability of seismic data analysis. This study demonstrates the value of applying trimmed and robust sparse k-means algorithms to improve clustering performance in regions with complex tectonic activity.
GERAKAN ASRI DAN BERSIH (LINGSRIH) SEBAGAI UPAYA MENGURANGI SAMPAH DI KAWASAN WISATA PANTAI PANJANG LINGKUNGAN Agwil, Winalia; Rafflesia, Ulfasari; Rachamawati , Ramya; Damayanti , Septri
LOSARI: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2022): Juni 2022
Publisher : LOSARI DIGITAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53860/losari.v4i1.87

Abstract

Kebersihan lingkungan pantai menjadi salah satu hal penting agar pantai menjadi menarik di mata para pengunjung atau wisatawan. Namun, di pantai panjang kota bengkulu masih ditemukan sampah-sampah bertebaran. Sampah-sampah tersebut berasal dari limbah rumah tangga dan juga aktivitas pengunjung di pantai. Untuk menanggulangi hal tersebut salah satu kegiatan yang dapat dilakukan oleh mahasiswa dan dosen adalah dengan melakukan gerakan lingkungan bersih dan asri. Tujuan kegiatan ini adalah untuk mengurangi sampah-sampah yang berserakan dan menimbulkan rasa peduli lingkungan. Berdasarkan kegiatan yang dilakukan dapat dilihat mahasiswa dan beberapa masyarakat setempat sangat antusias berpartisipasi dalam kegiatan.
Co-Authors Agwil, Winalia Buyung Keraman Dedi Rosadi Devni Prima Sari Dian Agustina Dyah Setyo Rini Dyah Setyorini Evi Maryanti Idhia Sriliana Indah Wahyuliani Jose Rizal Lusiana Lusiana Mulia Astuti Nur Afandi Nur Afandi Pepi Novianti Rachamawati , Ramya Septri Damayanti Yulian Fauzi Zulfia Memi Mayasari