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All Journal Jurnal Matematika JITEK (Jurnal Ilmiah Teknosains) Unisda Journal of Mathematics and Computer Science (UJMC) Zeta - Math Journal Transformasi : Jurnal Pendidikan Matematika dan Matematika Jurnal Saintika Unpam : Jurnal Sains dan Matematika Unpam EDUTEC : Journal of Education And Technology Jurnal Ilmiah Matematika dan Pendidikan Matematika (JMP) International Journal of Research in Community Services Jurnal Pengabdian Masyarakat: BAKTI KITA Journal of Sustainable Community Development Shof Journal of Social Impact Joong-Ki
Novita Eka Chandra
Universitas Jenderal Soedirman
Religion Agriculture, Biological Sciences & Forestry Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Physics Social Sciences Veterinary Other

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Pengabdian Berbasis Hasil-Hasil Riset Etnomatematika kepada Guru Matematika SMA IT Al Irsyad Al Islamiyyah Purwokerto Prabowo, Agung; Novita Eka Chandra; Melda Juliza; Felinda Arumningtyas
Joong-Ki : Jurnal Pengabdian Masyarakat Vol. 5 No. 2: Februari 2026
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/joongki.v5i2.14374

Abstract

Etnomatematika adalah matematika berbasis budaya yang menjadikan budaya sebagai landasan dalam melakukan riset. Hasil-hasil riset etnomatematika berguna sebagai materi pembelajaran di ruang kelas untuk siswa, termasuk juga mahasiswa. Pengabdian ini menyasar pada guru-guru sebagai mitra pengabdian untuk menyampaikan hasil-hasil riset pengusul/pengabdi yang telah diteliti sejak 2015. Materi yang diterima mitra guru akan diolah, dikembangkan dan disampaikan kepada siswa-siswanya. Pengabdian ini menjawab permasalahan kebutuhan mitra terhadap materi etnomatematika terbaru terkait dengan pengembangan diri mitra guru terhadap akses dan penguasaan etnomatematika. Solusi untuk mengatasi masalah tersebut adalah dengan mengenalkan materi etnomatematika terbaru tentang penyandian angka tahun, khususnya sengkala dihyang. Metode pengabdian berupa penyampaian materi kepada para guru (sosialisasi), telaah artikel dan bedah buku etnomatematika hasil karya pengabdi.
Peramalan Kemiskinan di Kabupaten Banyumas Menggunakan Regresi Nonparametrik dengan Pendekatan Kernel Nadaraya Watson Adjusted Novita Eka Chandra; Melda Juliza; Muhammad Hafidh Nashrullah
UJMC (Unisda Journal of Mathematics and Computer Science) Vol 11 No 1 (2025): Unisda Journal of Mathematics and Computer Science
Publisher : Mathematics Department, Faculty of Sciences and Technology Unisda Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/ujmc.v11i1.10646

Abstract

Poverty is a serious challenge faced by the Banyumas Regency Government. Although the poverty rate in this region has shown a declining trend for more than a decade, the pattern of decline has not been linear. This study utilizes time series data representing the percentage of the poor population in Banyumas Regency from 2003 to 2024. This research primarily seeks to forecast the poverty rate in 2030 and to differentiate between the performance of two kernel functions, Gaussian and Epanechnikov, which are applied in nonparametric regression using the adjusted Nadaraya-Watson kernel approach. Analysis results suggest that the model performs best when the bandwidth is set at its optimal value of 0,538909 using the Epanechnikov kernel function. Based on the forecast, the poverty rate in 2030 is estimated to be 12,87%. This result indicates the need for well-planned strategies and policies by the Banyumas Regency Government to reduce the poverty rate over the next six years.
Pengabdian Berbasis Hasil-Hasil Riset Etnomatematika kepada Guru Matematika SMA IT Al Irsyad Al Islamiyyah Purwokerto Agung Prabowo; Novita Eka Chandra; Melda Juliza; Felinda Arumningtyas
Joong-Ki : Jurnal Pengabdian Masyarakat Vol. 5 No. 2: Februari 2026
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/joongki.v5i2.14374

Abstract

Etnomatematika adalah matematika berbasis budaya yang menjadikan budaya sebagai landasan dalam melakukan riset. Hasil-hasil riset etnomatematika berguna sebagai materi pembelajaran di ruang kelas untuk siswa, termasuk juga mahasiswa. Pengabdian ini menyasar pada guru-guru sebagai mitra pengabdian untuk menyampaikan hasil-hasil riset pengusul/pengabdi yang telah diteliti sejak 2015. Materi yang diterima mitra guru akan diolah, dikembangkan dan disampaikan kepada siswa-siswanya. Pengabdian ini menjawab permasalahan kebutuhan mitra terhadap materi etnomatematika terbaru terkait dengan pengembangan diri mitra guru terhadap akses dan penguasaan etnomatematika. Solusi untuk mengatasi masalah tersebut adalah dengan mengenalkan materi etnomatematika terbaru tentang penyandian angka tahun, khususnya sengkala dihyang. Metode pengabdian berupa penyampaian materi kepada para guru (sosialisasi), telaah artikel dan bedah buku etnomatematika hasil karya pengabdi.
Evaluasi Metode Inisialisasi pada Model Pemulusan Eksponensial melalui Data IPM Banyumas Raya Melda Juliza; Novita Eka Chandra; Felinda Arumningtyas; Puce Angreni
UJMC (Unisda Journal of Mathematics and Computer Science) Vol. 12 No. 1 (2026): Unisda Journal of Mathematics and Computer Science
Publisher : Mathematics Department, Faculty of Sciences and Technology Unisda Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/ujmc.v12i1.13519

Abstract

The forecasting accuracy of exponential smoothing models is significantly influenced by the determination of initial values (initialization). This study aims to evaluate the performance of initialization methods for Brown’s Double Exponential Smoothing model using Human Development Index (HDI) data from the Banyumas Raya region for the period 2010-2025. The research stages included identifying data patterns, constructing models using both simple initialization and optimal initialization with numerical optimization, performing the Ljung-Box test for residual diagnostics, and comparing model accuracy. Evaluation results indicate that the Brown model using the optimal initialization method effectively captures trend patterns. The application of optimal initialization consistently improved model accuracy across all regencies. The highest error improvement was observed in Banyumas Regency (28.65%), followed by Cilacap (28.29%), Banjarnegara (24.77%), and Purbalingga (22.89%). Based on these results, the optimal initialization model was used to project HDI values for the next three periods, revealing a sustained upward trend. In conclusion, determining initial values is a crucial component that alongside smoothing parameter optimization must be seriously considered when developing forecasting models.
Analisis Hubungan Indeks Ketahanan Pangan dan Presentase Kemiskinan di Jawa Tengah dengan Korelasi Kendall Tau Novita Eka Chandra; Melda Juliza; Abdul Aziz; Ari Wardayani
UJMC (Unisda Journal of Mathematics and Computer Science) Vol. 12 No. 1 (2026): Unisda Journal of Mathematics and Computer Science
Publisher : Mathematics Department, Faculty of Sciences and Technology Unisda Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/ujmc.v12i1.13623

Abstract

Food security and poverty are two important economic indicators that are interrelated and are a primary focus of the Sustainable Development Goals (SDGs). This study aims to analyze the strength and direction of the relationship between the Food Security Index (IKP) and the percentage of district/city poverty in Central Java Province from 2022 to 2025. The data used do not meet the assumption of a normal distribution and have several identical values (ties), so the analysis method used is the Kendall Tau correlation. The results show a significant negative relationship between the IKP and the percentage of poverty in Central Java. These results indicate that the IKP at the district/city level plays a role in reducing the percentage of poverty.
Pemberdayaan Masyarakat Desa Bumirejo Melalui Bank Sampah Syariah Novita Eka Chandra; Galuh Adi Irawan; Kiki Fatmala Dewi
Jurnal Pengabdian Masyarakat : BAKTI KITA Vol. 1 No. 1 (2020): Jurnal Bakti Kita
Publisher : LPPM Universitas Islam Darul 'Ulum Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/baktikita.v1i1.1926

Abstract

Kegiatan ini dimaksudkan untuk memberikan pengetahuan, pelatihan dan pendampingan kepada masyarakat Desa Bumirejo, Kecamatan Kepohbaru, Kabupaten Bojonegoro, Provinsi Jawa Timur dalam mengolah sampah menjadi komoditas yang memiliki nilai ekonomis dan nilai guna. Adapun tahapan-tahapan dalam pelaksanaan pengabdian masyarakat ini meliputi: sosialisasi awal, pelatihan teknis, pelaksanaan sistem bank sampah, pemantauan dan evaluasi. Output dari bank sampah syariah berupa komoditas yang bernilai ekonomis dan berdaya guna. Nilai ekonomis yang diperoleh masyarakat dari bank sampah yaitu tabungan uang yang berasal dari sampah non organik yang disetor ke bank sampah. Nilai guna berasal dari sampah organik yang diproses menjadi pupuk kompos. Mekanisme bank sampah syariah meliputi: tahap pertama pemilahan sampah rumah tangga, tahap ke dua penyetoran sampah ke bank, tahap ke-3 yaitu penimbangan, selanjutnya tahap pencatatan dan tahap terakhir adalah pengangkutan. Adapun yang membedakan bank sampah non syariah dengan syari’ah yaitu pada Ijab Kabul antara pihak nasabah dengan pengelola bank sampah yaitu dalam hal ini Kasun. Kesepakatan yang disetujui antara dua belah pihak dan saling menguntungkan dalam pembagian hasil bank sampah syari’ah. Manfaat yang diperoleh dari adanya program bank sampah yaitu dapat mengurangi sampah yang mencemari lingkungan dan supaya masyarakat mau beralih untuk mulai menabung sampah.
MODEL EXTENDED COX UNTUK MENGATASI NON-PROPORTIONAL HAZARD PADA DATA STUDI KANKER PARU-PARU Felinda Arumningtyas; Melda Juliza; Novita Eka Chandra; Amelia Wulandari
Jurnal Ilmiah Matematika dan Pendidikan Matematika Vol 17 No 2 (2025): Jurnal Ilmiah Matematika dan Pendidikan Matematika (JMP)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jmp.2025.17.2.18061

Abstract

Lung cancer is a major cause of cancer-related deaths in Indonesia, making it essential to identify factors influencing patient survival. This study aims to analyze lung cancer patient survival using the Extended Cox Model as an alternative when the Proportional Hazard (PH) assumption is not met. Secondary data from 137 lung cancer patients were analyzed using variables such as type of treatment, treatment history, cancer cell type, Karnofsky score, age, and time of diagnosis. The results showed that only the Karnofsky score was significant in Cox-PH, but the assumption test showed that the cell type and Karnofsky score variables violated PH. Therefore, the analysis was continued with the Extended Cox Model. The final results showed that cell type and Karnofsky score had a significant effect on survival. The Hazard Ratio showed that a certain cell type reduced the risk of death by 22.7%, and an increase of one unit in the Karnofsky score reduced the risk of death by 3.1%. Cancer cell type and Karnofsky score are important factors in the survival of lung cancer patients, and the Extended Cox model has been proven to provide more reliable estimates than Cox-PH when the PH assumption is not being followed.
Co-Authors Abdul Aziz Abdullah Zahid Abdullah Zahid Aditya Zulkarnaen Ali Aditya Zulkarnaen Ali Agung Prabowo Agung Prabowo Ahmad Abi Yazid Al-Bustomy Arroziq Alda Dwi Valentino Amelia Wulandari Ani Habibatun Nisa Ari Wardayani, Ari Arumingtyas, Felinda Awawin Mustana Rohmah Awawin Mustana Rohmah Ericha Dwi Ayu Prihastini Eva Wahyu Listyawati Evina Widianawati Felinda Arumningtyas Fifin Nur Aini Fiqiyah Biroudloh Fiqiyah Biroudloh Gadis Retno Apsari Galuh Adi Irawan Haykal Abidin Kiki Fatmala Dewi Lady Lina Aulia Lady Lina Aulia M. Syaiful Pradana Makhrus Afif Masriani Mahyuddin Megi Widiyah Triutami Megi Widiyah Triutami Melda Juliza Mohammad Syaiful Pradana, Mohammad Syaiful Muhammad Hafidh Nashrullah Mu’tasim Billah Nafisah, Qonitatin Nisaul Barakati Selirowangi Nisaul Barakati Selirowangi Nur Khofifah Nur Nensi Puce Angreni Renny Renny Rifky Ardhana Kisno Saputra Robiah Adawiyah Rohmaniah, Siti Sarinem Sarinem Seftina Diyah Miasary Sholikah, Layla Hidayatus Sinta Nurjanah Ely Siti Alfiatur Rohamaniah Siti Amiroch, Siti Siti Masrofatul Azizah Sri Haryatmi Supriyanto Supriyanto Wiwin Kusniati Zulaela Zulaela