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All Journal Wahana Matematika dan Sains CAUCHY: Jurnal Matematika Murni dan Aplikasi Journal of Medives JMPM: Jurnal Matematika dan Pendidikan Matematika International Journal of Natural Science and Engineering Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Jurnal Aplikasi Dan Inovasi Ipteks SOLIDITAS Prokons: Jurnal Teknik Sipil Journal of Mathematics Education and Science Journal of Social Outreach Jurnal Pengabdian Masyarakat Bangsa Teknikom: Teknologi Informasi, Ilmu Komputer dan Manajemen Jurnal Sains Benuanta Jurnal Benuanta Karakter: Jurnal Riset Ilmu Pendidikan Islam Jurnal ilmiah teknologi informasi Asia
Ratna Dwi Christyanti, Ratna Dwi
Jurusan Matematika, Universitas Kaltara
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Tingkat Kepuasan Mahasiswa Terhadap Pelayanan Dosen Pendidikan Agama Islam Menggunakan Fuzzy C-Means (Studi Kasus Di Universitas Kaltara) Abdul Arif; Dady Sulaiman; Ratna Dwi Christyanti
Jurnal Ilmiah Teknologi Informasi Asia Vol 16 No 1 (2022): Volume 16 Nomor 1 (8)
Publisher : LP2M INSTITUT TEKNOLOGI DAN BISNIS ASIA MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32815/jitika.v16i1.649

Abstract

Kaltara University (Unikaltar) is a private university located in North Kalimantan. Unikaltar conducts development efforts on stabilizing the quality of management and human resources. Based on this, it is necessary to measure the level of student satisfaction with the service of lecturers in teaching, especially Islamic education. The purpose this study to measure the level of student satisfaction with the ministry of lecturers in teaching Islamic education. The method used is fuzzy C-Means algorithm with GUI MATLAB. The stages of the research method that will be carried out include data collection, data input, Validity and Reliability Test, data classification using Fuzzy C-Means algorithm with GUI MATLAB, and analyzing output into two groups, namely group C1 (Dissatisfied) and group C2 (Satisfied). Satisfaction levels in odd semesters are high where the number of C1 (27%) and C2 (73%) groups is also high, with the number of C1 (30%) and C2 (30%) groups.
Clustering Wilayah Kerawanan Stunting Menggunakan Metode Fuzzy Subtractive Clustering Ratna Dwi Christyanti; Dady Sulaiman; Adymas Putro Utomo; Muhammad Ayyub
Jurnal Ilmiah Teknologi Informasi Asia Vol 17 No 1 (2023): Volume 17 Nomor 1 (8)
Publisher : LP2M INSTITUT TEKNOLOGI DAN BISNIS ASIA MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32815/jitika.v17i1.877

Abstract

Stunting is a chronic lack of nutrition experienced by toddlers, causing the body to be too short for its age. In Bulungan Regency, stunting is a problem that the government focuses on handling. Based on these problems, this study aims to determine the clusters of stunting susceptibility levels. The method used is Fuzzy Subtractive Clustering (FSC). The method stages in this research are data collection; clustering process using the FSC method; the process of determining the candidate cluster center; the cluster center consideration process using various parameters; then clustering the previously given data into the appropriate cluster based on the degree of membership of each. From this study it can be concluded that the radius (r) of 0.92 produces the best number of clusters. The number of clusters formed is 7 clusters as follows, cluster 1 has 2 sub-districts, cluster 2 has 3 sub-districts, cluster 3 has 3 sub-districts, cluster 4 has 1 sub-district, cluster 5 has 1 sub-district, cluster 6 has 1 sub-district, and cluster 7 has 1 district. Keywords: Stunting; Clustering ; Fuzzy Subtractive Clustering (FSC)
Penerapan Metode Double Moving Average dalam Meramalkan IHK Provinsi Kalimantan Utara Syahdan, St; Christyanti, Ratna Dwi; Kurniadi, Dwi
SAINTIFIK Vol 11 No 1 (2025): Saintifik: Jurnal Matematika, Sains, dan Pembelajarannya
Publisher : Universitas Sulawesi Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31605/saintifik.v11i1.569

Abstract

Keberhasilan perekonomian suatu bangsa dapat dilihat dari kemampuannya dalam mengendalikan inflasi, yang mana merupakan salah satu indikator dalam memberikan informasi mengenai perkembangan harga barang/jasa yang dibayar konsumen. Untuk itu guna mengukur tingkat inflasi suatu daerah, maka dapat digunakan Indeks Harga Konsumen (IHK). Dari hasil pengolahan data dengan perhitungan rata-rata bergerak sebanyak dua kali, yaitu menghitung Single Moving Average dan Double Moving Average, kemudian dilanjutkan dengan menghitung nilai konstanta, slope, diperoleh model terbaik yaitu dengan nilai Mean Absolute Percentage Error (MAPE) sebesar . Dari model persamaan tersebut, diperoleh hasil peramalan pada bulan Juli 2024 sebanyak 105,580; Agustus 2024 sebanyak 105,600; September 2024 sebanyak 105,620; Oktober 2024 sebanyak 105,640; November 2024 sebanyak 105,660; serta Desember 2024 sebanyak 105,680. Dari data ini diketahui bahwa hasil peramalan IHK Provinsi Kaltara untuk 6 bulan yang akan datang yaitu dari bulan Juli sampai dengan Desember 2024 mengalami peningkatan setiap bulannya.
Solusi Numerik Model Epidemi Seir pada Penyebaran Tuberkulosis dengan Metode Dekomposisi Adomian Christyanti, Ratna Dwi; Syahdan, St
JMPM: Jurnal Matematika dan Pendidikan Matematika Vol 4 No 2: September 2019 - February 2020
Publisher : Prodi Pendidikan Matematika Universitas Pesantren Tinggi Darul Ulum Jombang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26594/jmpm.v4i2.1677

Abstract

Tuberkulosis (TB) merupakan penyakit menular yang menyerang paru-paru. Dalam program penanggulangan TB, sangat perlu diperhatikan jumlah pasien dengan hasil pengobatan lengkap, meninggal, gagal, default dan pindah. Pada artikel ini, dibangun sebuah model matematika yang menggambarkan tingkat penyebaran infeksi penyakit TB dengan menggunakan metode Dekomposisi Adomian. Kemudian melakukan simulasi terhadap model penyebaran penyakit tersebut. Tahapan metode penelitian meliputi membangun model epidemi SEIR untuk penyebaran penyakit TB; mencari solusi untuk penyebaran penyakit TB dengan menggunakan metode Dekomposisi Adomian; melakukan simulasi berbantuan perangkat lunak; menganalisis hasil simulasi; serta menyimpulkan perilaku model yang dianalisis tersebut. Dari hasil simulasi, ditemukan bahwa model ini cukup baik untuk menggambarkan penyebaran penyakit TB dengan menggunakan parameter yang bersesuaian.
Implementation of Fuzzy C-Means in Clustering Stunting Prone Areas Christyanti, Ratna Dwi; Sulaiman, Dady; Utomo, Adymas Putro; Ayyub, Muhammad
International Journal of Natural Science and Engineering Vol. 6 No. 3 (2022): October
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/ijnse.v6i3.53048

Abstract

Stunting is a chronic nutritional problem that occurs in toddlers, defined based on height for age (TB/U) which is less than two negative standard deviations or a toddler's height is shorter than it should be. Stunting is a chronic nutritional problem in toddlers, characterized by a shorter height than the height of children his age. Bulungan Regency is one of 160 urban regencies in Indonesia that is intervened to focus on reducing stunting. Based on these problems, this study aims to determine the cluster of stunting vulnerabilities in Bulungan Regency. The method used is Fuzzy C-Means (FCM). The results of this study are that the area in cluster 1 has a high level of vulnerability because it has the lowest level of adequacy of posyandu (active) and high incidence of LBW in infants, cluster 2 has a moderate level of vulnerability because it has an adequate level of puskesmas, adequacy of posyandu (active), the adequacy of doctors, the adequacy of nutritionists, the adequacy of midwives, the percentage of moderate LBW, and cluster 3 have a low level of vulnerability because they have a low average percentage of LBW and a high level of adequacy of posyandu (active) in the area.
Pelatihan Pembuatan Briket Berbahan Limbah Sekam Padi Sebagai Sumber Energi Alternatif Desa Sajau Hilir Ulva, Siti Maria; Sulaiman, Dady; Syahdan, St.; Sari, Ayu Lingga Ratna; Arif, Abdul; Christyanti, Ratna Dwi
Jurnal Pengabdian Masyarakat Bangsa Vol. 3 No. 4 (2025): Juni
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v3i4.2418

Abstract

Limbah sekam padi memiliki potensi besar sebagai bahan baku energi alternatif, namun limbah dari proses pengolahan hasil pertanian yang melimpah ini belum dimanfaatkan secara optimal. Pembakaran langsung sekam padi sering menimbulkan polusi udara, sehingga perlu dilakukan pengolahan yang lebih ramah lingkungan. Salah satu solusinya adalah dengan mengolah sekam padi menjadi briket yang dapat digunakan sebagai sumber energi terbarukan. Artikel ini bertujuan untuk menjelaskan kegiatan pelatihan pembuatan briket berbahan limbah sekam padi sebagai upaya pemanfaatan limbah pertanian sekaligus pemberdayaan masyarakat Desa Sajau Hilir. Metode yang digunakan dalam kegiatan pengabdian ini adalah dengan dilakukannya pendekatan partisipatif yaitu demonstrasi teknik pembuatan briket, serta pendampingan teknis dalam proses produksi. Pelatihan dilakukan secara partisipatif agar terjadi transfer pengetahuan yang efektif kepada masyarakat. Hasil kegiatan menunjukkan bahwa peserta mampu memahami dan mempraktikkan pembuatan briket secara mandiri. Pelatihan ini memberikan dampak positif terhadap peningkatan kesadaran masyarakat mengenai energi alternatif serta potensi pemanfaatan limbah lokal sebagai solusi energi terbarukan di tingkat desa.
Persepsi Mahasiswa Mengenai Pelaksanaan Layanan Pendidikan Mata Kuliah Pendidikan Agama Islam di FMIPA Unikaltar Tahun Akademik 2021/2022 Abdul Arif; Ratna Dwi Christyanti
Karakter : Jurnal Riset Ilmu Pendidikan Islam Vol. 2 No. 3 (2025): Agustus: Karakter : Jurnal Riset Ilmu Pendidikan Islam
Publisher : Asosiasi Riset Ilmu Pendidikan Agama dan Filsafat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/karakter.v2i3.1186

Abstract

The Faculty of Mathematics and Natural Sciences (FMIPA) of the University of East Kalimantan (Unikaltar) consistently conducts satisfaction surveys to improve the quality of services provided to students. This survey aims to evaluate the performance of each work unit, including lecturers, with the hope that the results obtained can identify aspects that are still hampering or suboptimal. The survey results serve as the basis for formulating steps to improve and enhance the quality of educational services within the faculty. This study specifically highlights the level of student satisfaction with the performance of lecturers in the Islamic Religious Education course. The survey implementation process includes several stages, starting from data collection using a survey instrument, the data input process, and testing the validity and reliability of the instrument to ensure data reliability. Next, the collected data is processed and analyzed to obtain an objective picture of student perceptions. Based on the analysis, the student satisfaction index value obtained is 3.16. This figure is in the "Good" or "Satisfied" category, indicating that students are generally satisfied with the service and learning process carried out by lecturers in the course. These findings provide important input for the institution in maintaining and improving the quality of learning, particularly in the field of religious studies. In the future, it is hoped that similar surveys can continue to be carried out periodically so that the service improvement process can run continuously.
Co-Authors Abdul Arif Abdul Arif Abdul Arif Abdul Arif Abdul Arif, Abdul Adymas Putro Utomo Adymas Putro Utomo Adymas Putro Utomo Arika Indah Kristiana Ayyub, Muhammad Chuzaimah Chuzaimah Chuzaimah Chuzaimah, Chuzaimah Dady Sulaiman Dady Sulaiman Darmansyah Dewi Erla Mahmudah Dewi Erla Mahmudah, Dewi Erla Didi Adriansyah Eka Wahyunita Sari Puluadji Enny Harviyanti Erma Fatimah Fidia Deny Tisna Amijaya Imam Muazansyah Jayanti, Renata Kurniadi, Dwi Moh Khoridatul Huda, Moh Khoridatul Muh. Azir Muzakkir Muhammad Ayyub Muhammad Ayyub Pangerang, Fitrah Pangerang Prihandini, Rafiantika M. Renata Jayanti Ridho Alfarisi, Ridho Rina Lesmana Rura, Rospina Rusyanti, Nila Sari, Ayu Lingga Ratna Sholehah Sholehah Silawati Alawiyah Silawati Alawiyah Siti Aisyah Siti Aisyah Siti Aisyah Siti Maria Ulva St Syahdan St. Syahdan, St. Syahdan, St Tri Purwanto, Tri Tri Widyasari Ulva , Siti Maria Ulva, Siti Maria Vensensius Wibowo Romadhoni Zandra Singal, Rachel