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Riri Syafitri Lubis

Universitas Islam Negeri Sumatera Utara, Medan, Indonesia

Author-ID : 3325332

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences 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 Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation Other

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PENGEMBANGAN VIDEO PEMBELAJARAN MATEMATIKA BERBASIS ADVANCE ORGANIZER DI KELAS X SMA DARUSSALAM Turrizqiya, Aulia; Yahfizham; Lubis, Riri Syafitri
Relevan : Jurnal Pendidikan Matematika Vol 2 No 1 (2022): Relevan : Jurnal Pendidikan Matematika
Publisher : Yayasan Amanah Nur Aman

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Penelitian ini menggunakan model pengembangan ADDIE dengan 5 tahapan, yaitu analysis (analisis), design (desain), development (pengembangan), implementation (implementasi) dan evaluation (evaluasi). Subjek pada penelitian ini yaitu peserta didik di kelas X IPA 1 SMA Darussalam yang berjumlah sebanyak 25 peserta didik. Instrumen pada penelitian ini menggunakan angket untuk melihat kevalidan dan kepraktisan media dan tes hasil belajar peserta didik untuk melihat tingkat keefektifan dari media yang dikembangkan.Pembuatan video ini dilakukan dengan5 tahapan, yaitu analysis (analisis), design (desain), development (pengembangan), implementation (implementasi) dan evaluation (evaluasi). Hasil penelitian ini menunjukkan bahwa tingkat kevalidan dari media pembelajaran sebesar 2,7 dengan kategori baik/cukup valid. Untuk tingkat kepraktisan dari media pembelajaran berdasarkan angket respon peserta didik sebesar 3,53 dengan kategori kurang baik/ kurang praktis dan angket respon guru matematika sebesar 4,64 dengan kategori baik/ cukup praktis. Sedangkan untuk tingkat keefektifan dari media pembelajaran berdasarkan hasil perhitungan validitas instrumen soal test menggunakan rumus korelasi product moment dengan angka kasar diperoleh rata-rata sebesar 0,869 dengan kategori sangat tinggi. Nilai thitung 8,434 dan nilai ttabel 0,396, sehingga instrumen soal test signifikansi dengan taraf kesalahan α = 0,05 atau 5%. Persentase ketuntasan klasikal peserta didik diperoleh rata-rata sebesar 80% dengan kategori baik, maka media pembelajaran ini dikatakan efektif. ABSTRACT This study uses the ADDIE development model with 5 stages, namely analysis, design, development, implementation and evaluation. The subjects in this study were students in class X IPA 1 SMA Darussalam, totaling 25 students. The instrument in this study used a questionnaire to see the validity and practicality of the media and student learning outcomes tests to see the effectiveness of the developed media. The making of this video was carried out in 5 stages, namely analysis (analysis), design (design), development (development), implementation (implementation) and evaluation (evaluation). The results of this study indicate that the level of validity of the learning media is 2.7 with a good/fairly valid category. For the level of practicality of learning media based on student response questionnaires of 3.53 in the poor/less practical category and the mathematics teacher's questionnaire response of 4.64 in the good/fairly practical category. Meanwhile, for thelevel of effectiveness of the learning media based on the results of the calculation of the validity of the test instrument validity using the product moment correlation formula with rough numbers, an average of 0.869 was obtained in the very high category. The tcount value is 8.434 and the ttable value is 0.396, so the instrument is a test of significance with an error level of = 0.05 or 5%. The percentage of classical completeness of students obtained on average is 80% with a good category, then this learning media is said to be effective.

PENGEMBANGAN MODUL PEMBELAJARAN MATEMATIKA BERBASIS CONTEXTUAL TEACHING LEARNING Indah, Windi Rezeki; Lubis, Riri Syafitri; Siregar, Tanti Jumaisyaroh
Relevan : Jurnal Pendidikan Matematika Vol 2 No 2 (2022): Relevan : Jurnal Pendidikan Matematika
Publisher : Yayasan Amanah Nur Aman

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Penelitian ini bertujuan untuk mengembangkan bahan ajar berupa modul pembelajaran matematika berbasis contextual teaching learning. Materi ajar yang disajikan peneliti adalah integral untuk peserta didik kelas XI SMA/MA. Subjek dalam penelitian ialah peserta didik kelas XI IPA 2 Di Perguruan Islam Cerdas Murni Tembung. Prosedur Pengembangan modul pembelajaran matematika dalam penelitian ini mengacu pada model pengembangan 4D yakni Tahap pendefinisian (define), Tahap perancangan (design), Tahap pengembangan (develop) dan Tahap penyebaran (disseminate). Modul pembelajaran yang dikembangkan dinyatakan layak berdasarkan skor rata-rata validasi modul 4,6 kategori sangat baik. Memenuhi kriteria praktis berdasarkan penilaian guru 4,6 kategori sangat baik dan respon siswa 4,55 kategori sangat baik. Memenuhi kriteria efektif berdasarkan ketuntasan belajar klasikal sebesar 80% dimana 28 dari 35 orang peserta didik dan berdasarkan Uji N-Gain dengan hasil signifikan 0,82 menunjukan kategori 0,70 < g > 1,00 tergolong sangat tinggi. ABSTRACT This study aims to develop teaching materials in the form of mathematics learning modules based on contextual teaching learning. The teaching material presented by the researcher is integral for class XI SMA/MA students. The subjects in the study were students of class XI IPA 2 at the Tembung Intelligent Pure Islamic College. The procedure for the development of the mathematics learning module in this study refers to the 4D development model, namely the definition stage, the design stage, the develop stage and the dissemination stage. The learning module developed was declared feasible based on the average score of the module validation in the very good category. Meet the practical criteria based on the teacher's assessment of 4.6 very good categories and student responses in the very good category. Fulfilling the effective criteria based on the classical learning completeness of which of the students and based on the N-Gain Test with significant results indicating the category is classified as very high.

PENERAPAN MODEL ARIMA UNTUK PERAMALAN JUMLAH ORANG YANG MELAKUKAN PEMBAYARAN PROGRAM JAMINAN HARI TUA PADA BPJS KETENAGAKERJAAN CABANG TANJUNG MORAWA Riri Syafitri Lubis; Annisa Fadhliyah; Lyra Ananda; Siti Rolizah Pohan
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 5 No. 1 (2024): Volume 5 No 1 Tahun 2024
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v5i1.26017

Penelitian ini mengevaluasi penerapan model ARIMA dalam meramalkan jumlah individu yang melakukan pembayaran Program Jaminan Hari Tua (JHT) di BPJS Ketenagakerjaan Cabang Tanjung Morawa. Menggunakan data pembayaran periode Januari 2019 hingga Desember 2023, penelitian bertujuan memahami pola dan tren pembayaran, sehingga dapat memberi prakiraan akurat untuk mendukung keputusan manajemen dalam merencanakan dan mengalokasikan sumber daya. Analisis melibatkan transformasi Box-Cox dan uji stasioner pada rangkaian waktu untuk menentukan orde model ARIMA yang paling sesuai. Hasil menunjukkan bahwa model ARIMA (1,0,1) menjadi model terbaik dengan nilai MAPE sebesar 21,1%, menunjukkan tingkat kesalahan peramalan yang dapat diterima. Dengan demikian, penelitian ini dapat dijadikan sebagai acuan dalam meramalkan pembayaran JHT di masa mendatang.

THE USE OF HILL CLIMBING ALGORITHM IN GRAPHIC INFORMATION SYSTEM TO FIND THE SHORTEST ROUTE FOR WASTE TRANSPORTATION IN MEDAN DENAI DISTRICT Putri Harahap, Rahmelia; Syafitri Lubis, Riri; Cipta, Hendra; Syahputri, Linna
Journal of Mathematics and Scientific Computing With Applications Vol. 6 No. 1 (2025)
Publisher : Pena Cendekia Insani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53806/jmscowa.v6i1.992

Factors causing environmental damage/disaster include internal and external damage. By maximizing the transportation system, we are able to address the social issues optimally so that we provide more positive impacts on public health, environmental health, and urban beauty. Factors related to distribution can make decisions about the routes of transportation. The purpose of this research is to optimize the route of truck transportation using the Hill Climbing Algorithm in the District of Medan Denai from one point to another towards the construction site of the Sentairai. Based on the results of this study, it shows that the route of truck transport to the top with a graphical information system using Ailgorithm Hill Climbing, the route of truck transport to the top with a graphical information system using Ailgorithm Hill Climbing in the District of Medan Aireai with the shortest route for transport to the top is through a route with a total distance of 32.25 km with a travel time of 85 minutess and a total time of 8 hours 20 minutess, namely through: Start Point (Kantor Camat Medan Area) - Pandau Hulu II Village - Kotamatsum II Village - Pasar Merah Timur Village - Kotamatsum III Village - Tegal Sari III Sub-district – Tegal Sari I Sub-district – Sei Rengas Permata Sub-district – Tegal Sari II Sub-district – Sei Rengas II Sub-district – Sukaramai II Sub-district – Sukaramai I Sub-district – Kotamatsum I Sub-district and TPA.

Implementasi Pengendalian Persediaan Dodol Dengan Metode Newsboy Problem Pada Toko Sejahtera Pasar Bengkel Serdang Bedagai Farwansyah, Mhd Rio; Nasution, Hamidah; Lubis, Riri Syafitri
Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Vol. 7 No. 1 (2024): Sustainable Development Goal in Mathematics and Mathematics Education
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/proximal.v7i1.4037

Bengkel market is a souvenir or snack and is often referred to as a typical tour of Serdang Bedagai Regencey.Dodol with its flavor variant is the most famous product in this area, so it is often referred to as the DOdol Market. The prosperous shop has a problem, namely that there is often an excess of dodol production that does not sell well, thus making the store unable to optimize profits. The Newsboy Problem Method is a stochastic model that considers the existence of uncertainty factor in the amount of demand ffor each production period. From the results of research using the Newsboy Problem method, the optimal production quantity for the original lunkhead is 155 pcs with a profit of Rp.10.605.000. Pandan dodol produces an optimal production quantity of 110 pcs with a profit of Rp.10.920.000. and dodol durian produces an optimal production quantity of 125 pcs with a profit of Rp.9.990.000.

Klasifikasi Kabupaten/ Kota Sejahtera dan Tidak Sejahtera dengan Metode Spectral Clustering pada Provinsi Sumatera Utara Batu, Annisa Rajaq Lumban; Lubis, Riri Syafitri; Harleni, Silvia
Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Vol. 8 No. 1 (2025): Integrasi Matematika, Teknologi, dan Budaya dalam Pendidikan dan Aplikasi Terap
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/proximal.v8i1.4887

People's welfare is basically a condition whose form is dynamic or in other words its quantitative value will never stop because it will continue to change along with the development of human life needs. In the Regional Medium Term Development Plan (RPJMD) of North Sumatra Province, the government is trying to realize an advanced and prosperous community life. Law No. 11 of 2019 article 3 paragraph 1, it is also written that the purpose of administering social welfare is to increase the level of welfare, quality and survival. As according to the Central Statistics Agency for North Sumatra in 2021 regarding indicators of people's welfare, namely, population, health, education, employment, household consumption and expenditure, housing and the environment, and participation in social activities. To make a strategy to improve the welfare of the people of North Sumatra, the Government needs to determine which districts or cities are prosperous and which are not. This study uses the spectral clustering method in which this method forms clusters obtained according to data taken at the Central Bureau of Statistics which will be carried out in 2022 data taken in 2021. The results of this study indicate the application of the spectral clustering method for classifying prosperous and less prosperous city districts in North Sumatra province and clusters obtained as many as 2 clusters from data from 33 urban districts in North Sumatra province, namely cluster 1 is a prosperous district or city, namely Medan and Deli Serdang, and cluster 2 is a district or city that is not prosperous, namely, apart from Medan and Deli Serdang.

Penerapan Metode Regresi Probit Biner dalam Menganalisis Faktor-Faktor yang Berpengaruh pada Tingkat Partisipasi Angkatan Kerja Wanita Utami, Ristika Dian; Lubis, Riri Syafitri; Cipta, Hendra
Justek : Jurnal Sains dan Teknologi Vol 8, No 2 (2025): Juni
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i2.29162

Abstract: The female labor force participation rate (LFPR) describes the percentage of the female population of working age who are engaged in economic activities. In this condition, the problem that often arises is that the LFPR of women is still lower than the LFPR of men, and the gap between the two is quite far. The purpose of this study is to find out what factors affect the LFPR of women in North Sumatra Province. The method used is binary probit regression method. The data revealed that 45.5% of districts/cities in North Sumatra Province were classified as low LFPR category. The results showed that the level of education (X1) and the informal sector (X5) had a significant effect on female TPAK with a classification accuracy value of 93.9%, indicating that the binary probit regression model used was able to classify the data correctly with a high level of accuracy.Abstrak: Tingkat partisipasi angkatan kerja (TPAK) wanita menggambarkan persentase populasi wanita pada usia kerja yang terlibat dalam kegiatan ekonomi. Dalam kondisi ini, masalah yang sering muncul adalah TPAK wanita masih lebih rendah dari TPAK laki-laki, dan kesenjangan antara keduanya cukup jauh. Tujuan dari penelitian ini yaitu untuk mengetahui faktor-faktor apa saja yang berpengaruh terhadap TPAK wanita di Provinsi Sumatera Utara. Metode yang digunakan adalah metode regresi probit biner. Data mengungkapkan bahwa 45,5% kabupaten/kota di Provinsi Sumatera Utara tergolong dalam kategori TPAK rendah. Hasil penelitian menunjukkan tingkat pendidikan (X1) dan sektor informal (X5) berpengaruh signifikan terhadap TPAK wanita dengan nilai ketepatan klasifikasi sebesar 93,9% menandakan model regresi probit biner yang digunakan mampu mengklasifikasikan data dengan tepat memiliki tingkat akurasi yang tinggi.

Application of k-prototypes algorithm to smoking addiction at FST UINSU medan Ritonga, Nurhalimah; Lubis, Riri Syafitri
Desimal: Jurnal Matematika Vol. 7 No. 3 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i3.24374

One of the addictive chemicals that can cause addiction is cigarettes. By combining smoking data among students of the Faculty of Science and Technology (FST) at UINSU Medan, this study seeks to overcome the problem of smoking. The K-Prototypes approach is one of the ones that is applied. Microsoft Excel 2010 and IBM SPSS Statistics are programs used to analyze research data. A sample questionnaire of FST students from UINSU Medan provided data. The findings showed that the K prototype had an impact on smoking factors, study programs, types of cigarettes, the number of cigarettes smoked, and the early age of smoking. There are 19 objects in Cluster 1, 21 objects in Cluster 2, and 25 objects in Cluster 3 students in each cluster. According to the cluster data of the K-Prototypes method, the smoking factor was caused by friends in cluster 1, which included early-age smokers (12.789) with 1.895 packs of salt warehouse cigarettes. In the second group of early smoking age groups (15.810), 1.381 packs of salt warehouse cigarettes were smoked, and the smoking factor was associated with the family. In the third group of early-age smokers (20.44), there were 1.96 packs of Marlboro cigarettes, and friends were a factor in smoking. Thus, the three study programs at FST UINSU Medan require a lot of attention from schools, families, and students.

Optimizing portfolio performance in indonesian banking stocks: An empirical application of the markowitz mean-variance framework Pulungan, Ahmad Fauzan; Riri Syafitri Lubis
Desimal: Jurnal Matematika Vol. 8 No. 2 (2025): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/nxebn152

This study aims to construct an optimal investment portfolio in Indonesia’s banking sector using the Mean-Variance Markowitz approach. Employing a quantitative descriptive method, the research analyzes monthly closing stock prices of 10 banking companies listed on the Indonesia Stock Exchange from January to December 2024. Data processing was conducted using Microsoft Excel, including return calculation, risk measurement through standard deviation, covariance matrix formation, and portfolio optimization via the Sharpe Ratio. The findings reveal that the optimal portfolio consists of BRIS and PNBN stocks, achieving the highest Sharpe Ratio of 0.6639, which reflects a well-balanced risk-return profile. Conversely, the minimum-risk portfolio yielded a negative return, highlighting that lower risk does not always translate to profit. These results affirm the effectiveness of the Markowitz model in supporting rational investment decision-making, particularly for young investors.

DYNAMICS OF RAINFALL AND TEMPERATURE IN NORTH SUMATRA PROVINCE: COMPREHENSIVE ANALYSIS OF TEMPORAL TRENDS Lubis, Riri Syafitri; Suzana, Yenny; Syarah, Fatmah; Fajriana, Fajriana; Rozi, Fachrur; Nusantara, Badai Charamsar
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 1 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss1pp215-226

This research aims to analyze the temporal trends of rainfall and temperature in North Sumatra Province, focusing on the Medan and Deli Serdang regions. The data used in this study was obtained from the Central Statistics Agency of North Sumatra (BPS Sumut) and spans the period from January 2000 to December 2022. The Mann-Kendall test was applied to identify trends, Sen's Slope Estimator measured the trend slope, and Pearson correlation analysis assessed the relationship between rainfall and temperature. Key findings indicate that Medan has a higher monthly rainfall average than Deli Serdang, with both regions showing a significant increasing trend in rainfall, although the rise is gradual. Additionally, a positive trend in temperature was identified, reflecting broader climate change patterns. However, the correlation between rainfall and temperature was weak, indicating minimal direct interaction between these variables in the study areas. These results contribute valuable insights into climate dynamics and are critical for the development of climate change adaptation strategies in North Sumatra Province.

Co-Authors Adisty, Fahliza Ahmad Sugarda Ainun Palihah Alfina Febriani Nasution Anggi Pranata Annisa Fadhliyah Annisa, Nur Alvi Aprilia, Rima Aslam, Fazri Aulia Turrizqiya Batu, Annisa Rajaq Lumban Batubara, Fikri Husin Bella Syahrani Nasution Blaster, Irena Br Siahaan, Erika Handayani Cynthia, Mayang Modelina Dara Nurul Hasnah Dian Darmawan Didik Santoso Didik Santoso Dimas Bagus Arjuna Dinda Renata Cecilia Dwi Haprida Ningsih Elma Dwi Ariana Aprilia Zam Fachrur Rozi Fadilatus Sahraini Siregar Fadillah, Yanna Rezki Fajriana, Fajriana Farwansyah, Mhd Rio Fatmawati, Ayu Isnaini Fernando, Anjas Fuja Nauli Pasaribu Giawa, Freddy Gishela Agra Moukia Gurusinga, Ditha Aulia Harleni, Harleni Harleni, Silvia Hasibuan, Elpita Sari Hazizah, Salsabillah Hendra Cipta Heni Pujiastuti Ilham Salim Siregar Ilham Syaputra Indah Kholila Indah, Windi Rezeki Ir Zulkarnain, Ayu Najmita Binti Irena Blaster Ismail Husein, Ismail Kartika , Dinda Khairun Nikmah Lisa Setia Ningsih Lyra Ananda M Agung Pradana Manurung, Silvi Khairiyah Maudya Nur Azura Mohammad Badri Muhammad Arfie Munawar Muhammad Farhan Mingka Muliawan, Hari Nadhila, Nurul Nasution, Dafa Al Qifti Nasution, Hamidah . Neliwati Neliwati Nenna Irsa Syahputri Nina Amanda nova audry utami Nurmadani Nurmawati Nurmawati Nurmawati Nurul Nadhila Nusantara, Badai Charamsar Oktaviana Oktaviana Palihah, Ainun Pertiwi, Fina Nur Pradana, M Agung Prasetya, Nurul Huda Pratiwi, Miftah Pulungan, Ahmad Fauzan Putri Harahap, Rahmelia Rahmat Darmawan, Rahmat Rakhmawati, Fibri Rambe, Muhammad Vikry Rezky Riani Dwi Lestari Ricka Afriani Rima Aprilia Rima Aprilia Rina Filia Sari Rina Filia Sari, Rina Filia Rina Sari Filia Rina Widyasari Rina Widyasari Ritonga, Nurhalimah Rivani Kabrina Br Surbakti Rizkina, Ayu Rizky Mulyani Ropiqoh, Ropiqoh Ropiqoh, Ropiqoh Rusydi Ananda Ruth Mayasari Simanjuntak Sahraini Siregar, Fadilatus Sajaratud Dur Samsudin, Samsudin Sari, Evi Indah Sintia Agustina Siregar Siregar, Evi Borliana Siregar, Evi Borliana Siregar, Fadilatus Sahraini Siregar, Tanti Jumaisyaroh Siti Jubaidah Siti Rolizah Pohan Siti Zunaida Nasution Suci Permata Sari Suendri, Suendri Sulaiman Ananda Harahap Supiah Supiah Susanti, Komaria Susilowati, Rahmi Suzana, Yenny Syafitri, Ellysa Syahfitri, Fatharani Syahputra, Bayu Teza Syahputri, Linna Syahputri, Nenna Irsa Syarah, Fatmah Tanti Jumaisyaroh Siregar Tri Handayani Tri Lutfiah Wardah Turrizqiya, Aulia Utami, Ristika Dian Vani Hajari Wenny Marta Dolok Saribu Widyasari, Rina Widyasari, Rina Windi Rezeki Indah Wulandari Wulandari Wulandari, Mitha Yahfizham Yahfizham Yoffa Sunita Yulanda Novita Zebua Yulinda, Jeni Zakaria Alfikri Sirait

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