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All Journal CAUCHY: Jurnal Matematika Murni dan Aplikasi AdMathEdu : Jurnal Ilmiah Pendidikan Matematika, Ilmu Matematika dan Matematika Terapan Kubik Jurnal Sains Matematika dan Statistika Edumatsains NUMERICAL (Jurnal Matematika dan Pendidikan Matematika) Sinkron : Jurnal dan Penelitian Teknik Informatika Desimal: Jurnal Matematika BAREKENG: Jurnal Ilmu Matematika dan Terapan Justek : Jurnal Sains Dan Teknologi JURNAL TEKNIK INFORMATIKA DAN SISTEM INFORMASI Zeta - Math Journal Jurnal Pendidikan Matematika (JUDIKA EDUCATION) NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Zero : Jurnal Sains, Matematika, dan Terapan AXIOM : Jurnal Pendidikan dan Matematika JURNAL MathEdu (Mathematic Education Journal) JOURNAL OF SCIENCE AND SOCIAL RESEARCH Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya M A T H L I N E : Jurnal Matematika dan Pendidikan Matematika Math Educa Journal Progresif: Jurnal Ilmiah Komputer JURNAL PEMBELAJARAN DAN MATEMATIKA SIGMA (JPMS) Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika JOURNAL OF INFORMATION SYSTEM RESEARCH (JOSH) SEPREN: Journal of Mathematics Education and Applied Community Development Journal: Jurnal Pengabdian Masyarakat Theta : Jurnal Pendidikan Matematika Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Jurnal Pengabdian kepada Masyarakat Nusantara KUBIK: Jurnal Publikasi Ilmiah Matematika FARABI: Jurnal Matematika dan Pendidikan Matematika Algebra : Jurnal Pendidikan, Sosial, dan Sains Mathematics and Applications (MAp) Journal Humantech : Jurnal Ilmiah Multidisiplin Indonesia Jurnal IPTEK Bagi Masyarakat Journal of Mathematics and Scientific Computing With Applications Relevan Jurnal Informatika Teknologi dan Sains (Jinteks) Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Abdimas Indonesian Journal Bulletin of Applied Mathematics and Mathematics Education International Conference on Sciences Development and Technology JS (Jurnal Sekolah) Jurnal Bayesian : Jurnal Ilmiah Statistika dan Ekonometrika JME APPA : Jurnal Pengabdian Kepada Masyarakat Faedah: Jurnal Hasil Kegiatan Pengabdian Masyarakat Indonesia Jurnal Pengabdian Masyarakat Algebra Indonesia Bergerak: Jurnal Hasil Kegiatan Pengabdian Masyarakat Relevan : Jurnal Pendidikan Matematika
Riri Syafitri Lubis
Universitas Islam Negeri Sumatera Utara, Medan, Indonesia
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Distribution Route Optimization Using Nearest Neighbor Algorithm and Clarke and Wright Savings Pratiwi, Miftah; Lubis, Riri Syafitri
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 3 (2023): Article Research Volume 7 Issue 3, July 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.12622

Abstract

in the process of this research Problems that occur is an irregular delivery of goods that takes a lot of time and delivery distance, so the distribution delivery process is not optimal. Therefore, researchers will conduct research on how to determine the best distribution route in optimizing delivery distance and time. The purpose of this study is to find distribution routes that are more optimal by using the nearest neighbor and Clarke and Wright savings and do a comparison with the company's current route This. The company's current mileage route is 319.9 km while using the nearest neighbor algorithm, the total distance traveled so far is obtained 240.9 and experienced mileage savings of 79 km or 25.22% and with the Clarke and Wright savings algorithm, the distance traveled is obtained 239.2 km and experienced mileage savings of 80.7 km or 25.22 %. Therefore, the Clarke and Wright Savings algorithm is more
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

Abstract

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.
Analisis Regresi Bayesian Hurdle Poisson untuk Mengidentifikasi Faktor yang Mempengaruhi Jumlah Kasus Demam Berdarah Dengue (DBD) Syahfitri, Fatharani; Lubis, Riri Syafitri
Jurnal Pendidikan Matematika : Judika Education Vol 7 No 2 (2024): Jurnal Pendidikan Matematika:Judika Education
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/judika.v7i2.11913

Abstract

This research aims to determine cases of dengue fever using the Bayesian Hurdle Poisson regression method, and the variables that have a significant influence on dengue cases in Medan City in 2022. The method used the Bayesian Hurdle Poisson regression. Research data was analyzed using the SPSS 25 software application and Rstudio 4.4.1 software. Yhe research result show that Bayesian Hurdle Poisson regression in the logit model has the most significant influecne on the number of casses of Dengue Hemorrhagic Fever (DHF) in Medan City in 2022, namely population density (X1), area height (X2), and health facilities (X4). A one unit increase in this variable is equivalent to doubling the number of cases of Dengue Hemorrhagic Fever (DHF) above the initial average, assuming other variables remain constant. Conclusion, Dengue Hemorrhagic Fever (DHF) using Bayesian Hurdle Poisson regression shows yhat the population density variable, the height of area and the number of health facilities play an important in the development of public health in the city of Medan in 2022. Keywords : Dengue Hemorrhagic Fever (DHF), Medan City, Bayesian Hurdle Poisson Regression
OPTIMISASI PENDISTRIBUSIAN PRODUK KRIPIK DALAM KEMASAN DENGAN METODE TRANSPORTASI PADA UD. KERIPIK RUMAH ADAT MINANG Ir Zulkarnain, Ayu Najmita Binti; Syafitri Lubis, Riri; Cipta, Hendra
JURNAL MathEdu (Mathematic Education Journal) Vol 7 No 1 (2024): JURNAL MathEdu (Mathematic Education Journal) Maret 2024
Publisher : Program Studi Pendidikan Matematika Institut Pendidikan Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37081/mathedu.v7i1.5957

Abstract

Keripik Rumah Adat Minang is a company of snack food where producing packaged sweet potato chips under the brand of rumah adat minang. The distribution of chips is hampered because the number of consumer request in various cities is higher than the amount of capacity in the warehouse, resulting in the distribution process often delays and having to be done repeatedly so that make the distribution costs become large. Plus now, many roads have been closed so that the distribution routes that are traversed are getting farther away, so its certain that the company incurs huge costs for the distribution of chips. The purpose of this research is to apply the north west corner method as an initial solution for allocating how many chips are produced, to apply the stepping stone method as the final solution in minimizing the cost of distributing chips and to help companies minimize the cost of distributing chips. Both methods can solve problems in the distribution of chips from both warehouses to various destination cities. The results showed that the cost optimization obtained by using the north west corner method was Rp. 146,556,705 which succeeded in reducing as much as Rp. 30,579,886 from the initial cost of transportation of Rp 171,555,522 but it was not optimal, so 4 more iterations were carried out using the advanced method, namely the stepping stone method. Thus the cost of transportation distribution is optimal by generating a cost value of Rp. 146,075,000.
Pendugaan Hazard Rate Letusan Gunung Sinabung dengan Metode Single Decrement Pendekatan Likelihood Gurusinga, Ditha Aulia; Lubis, Riri Syafitri; Cipta, Hendra
JATISI Vol 11 No 1 (2024): JATISI (Jurnal Teknik Informatika dan Sistem Informasi)
Publisher : Universitas Multi Data Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35957/jatisi.v11i1.7052

Abstract

Abstract The eruption on Mount Sinabung made North Sumatera the province with the highest frequency of volcanic eruptions and the highest prevalence of deaths in Indonesia. As a consideration for reducing the risk of volcanic eruptions, a risk map was created through mathematical model calculations containing hazard rate values ​​based on the number of Mount Sinabung eruptions which became variables in the regression model for estimating the hazard rate of Mount Sinabung eruptions using the single decrement likelihood approach method. The research results show that the hazard rate value for the eruption of Mount Sinabung in 2020 has the largest value, namely 0.20765. The best and most feasible model after calculating the smallest Mean Squared Error (MSE), namely 0.000616 from the results of the hazard rate which has been transformed into the box cox, is the quadratic model. Through this model, it is assumed that the estimated hazard rate values of Mount Sinabung eruptions ​​in 2021, 2022 and 2023 will increase respectively.
ANALISIS PENGENDALIAN PERSEDIAAN MENGGUNAKAN METODE MIN-MAX DAN ECONOMIC ORDER QUANTITY (EOQ) Rizkina, Ayu; Lubis, Riri Syafitri; Widyasari, Rina
Humantech : Jurnal Ilmiah Multidisiplin Indonesia Vol. 1 No. 11 (2022): Humantech : Jurnal Ilmiah Multidisiplin Indonesia 
Publisher : Program Studi Akuntansi IKOPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32670/ht.v1i11.2313

Abstract

Penelitian ini bertujuan untuk menentukan jumlah pemesanan buah-buahan yang lebih ekonomis dengan membandingkan antara metode Min-Max dan Metode Economic Order Quantity (EOQ) guna melihat metode mana yang lebih efektif digunakan. Dalam penelitian ini digunakan data primer dengan menyebarkan kuisioner, lalu merata-ratakan data, sehingga didapat pemesanan ekonomis dengan menggunakan metode Min-Max pada buah jeruk yaitu 427,5kg/pekan, buah mangga yaitu 582,5kg/pekan, pada buah markisah yaitu 146kg/pekan, pada buah kesemek yaitu 180,25kg/pekan dan pada buah lainnya yang terdiri dari buah salak, terong belanda dan alpukat yaitu 273,75kg/pekan. Sedangkan pemesanan ekonomis dengan menggunakan metode EOQ pada buah jeruk yaitu 160,71kg/pekan, buah mangga yaitu 156,15kg/pekan, buah markisah yaitu 147,20kg/pekan, buah kesemek yaitu 124,94kg/pekan dan buah lainnya yang terdiri dari buah salak, terong belandan dan alpukat yaitu 122,98kg/pekan. Sedangkan yang digunakan pada Pasar Buah Berastagi pada buah jeruk yaitu 542,5kg/pekan, buah mangga yaitu 370,63kg/pekan, pada buah markisah yaitu 395,63kg/pekan, pada buah kesemek yaitu 304,38kg/pekan dan pada buah lainnya yang terdiri dari buah salak, terong belanda dan alpukat yaitu 391,25kg/pekan Dari perhitungan diatas didapat total persediaan buah-buahan menggunakan perhitungan Min-Max sebesar 1.610kg dan perhitungan menggunakan EOQ sebesar 711,97kg lebih ekonomis dibandingkan dengan perhitungan yang digunakan Pasar Buah Berastagi sebesar 1613,125.
Analisis Pengelolaan Surat Yang Masuk Pada Bidang Penaatan Dan Peningkatan Kapasitas Lingkungan Hidup Terhadap Surat Perintah Tugas Dan Surat Perintah Perjalanan Dinas Di Sumatera Utara Dengan Menggunakan Metode Regresi Annisa, Nur Alvi; Nurmadani; Fadillah, Yanna Rezki; Lubis, Riri Syafitri
Jurnal Pengabdian Masyarakat Vol. 1 No. 2 (2022): Desember 2022
Publisher : Unity Academy

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70340/japamas.v1i2.27

Abstract

Practical Work (KP) is an academic activity that is oriented towards forms of student learning to develop and improve a quality workforce. With practical work (KP) it is hoped that students will be able to add to their knowledge and experience in preparing themselves to enter the real world of work. problems that occur in the field of compliance and environmental capacity building in North Sumatra province, namely the preparation of data for incoming and outgoing letters which are still manual using a ledger which is then inputted with a computer which still uses Excel as a place to store personal data with different data, officers do 2 work times. therefore the practitioner tries to use the linear regression method to determine the effect between the two to make it more efficient.
Application of Simple Multi-Attribute Rating Technique Exploiting Rank (SMARTER) Method In Seed Selection Superior Corn in Silau Mangi Village Blaster, Irena; Lubis, Riri Syafitri; Syahputri, Nenna Irsa
International Conference on Sciences Development and Technology The 2nd ICoSDTech 2022
Publisher : International Conference on Sciences Development and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (571.837 KB)

Abstract

Agriculture is one of the important sectors in Indonesia. Most of Indonesia's population depends on the agricultural sector,one of which is corn farmers. Cultivation of corn plants starts from choosing quality seeds. Determination of quality cornseeds aims to increase productivity and quality of production. Various efforts can be made to increase corn production suchas the use of superior corn seeds. Efforts to increase corn production are still experiencing several obstacles, such as the lackof understanding of farmers in determining superior corn seeds. This study aims to apply the SMARTER method in selectingsuperior maize seeds in order to increase maize production. The Simple Multi Attribute Rating Technique Exploiting Rank(SMARTER) method is one of the methods in a decision support system whose solution is by using Rank Order Centroid(ROC) weighting on each criteria and sub-criteria. The results of the research carried out obtained five criteria that were usedas an assessment in the selection of corn seeds, namely resistance to pests, seed size, production yield, environmentaladaptation and harvest time
Gold Price Prediction Using the Fuzzy Time Series Saxena-Easo Method Fernando, Anjas; Lubis, Riri Syafitri; Cipta, Hendra
International Conference on Sciences Development and Technology The 1st ICoSDTech 2021
Publisher : International Conference on Sciences Development and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.013 KB)

Abstract

Gold is an investment that has the smallest risk compared to other investment methods, but every time the price of gold always fluctuates. This fluctuation will make it difficult for investors, the government, or those who need gold price data to see how the prospects for gold investment are going forward. To overcome this, a prediction or forecast is made. One of the forecasting methods developed with fuzzy theory is the Saxena-Easo fuzzy time series method. In this study, this method will be used to predict gold prices in the period 17 August 2021 to 31 December 2021. The purpose of this study is to determine the value of gold prices for the period 17 August 2021 to 31 December 2021 and to determine the accuracy of the fuzzy time series method. Saxena Easo. While the parameter used to measure forecasting accuracy is MAPE, if this parameter is in the range of 10% to 20% then the forecasting result is good, and if the parameter is below 10% then the forecast result is very good. The results of forecasting gold prices in the period 17 August – 31 December 2021 have a value that tends to increase and the MAPE obtained is 0.024277%. Therefore, it can be said that the prediction results for certain parameters are very good.
Analysis of Contraceptive Use Rates on Fertility Rates Using the Chaid Method (Chi-Squared Automatic Interaction Detection) Muliawan, Hari; Lubis, Riri Syafitri; Widyasari, Rina
International Conference on Sciences Development and Technology The 1st ICoSDTech 2021
Publisher : International Conference on Sciences Development and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.547 KB)

Abstract

Fertility is the result of real reproduction (live-born babies) from a woman or a group of women or the number of children that will be born by a woman during her reproductive period. Children born to a woman have 2 categories in the BKKBN, namely the number of children > 2 and the number of children 2. The fertility/birth rate by the number of children > 2 reaches 60.9%, so it is not following the BKKBN target because the target birth rate > 30% is included in the category tall. One of the efforts to control the fertility rate is by using contraception. A contraceptive device is a tool or method to prevent pregnancy. The existence of contraceptives but the fertility rate is still high So it is necessary to do targeting (targeting) with the CHAID (Chi-square Automatic Interaction Detection) method. This method is used for targeting and knowing which contraceptives are the most significant, effective, and have the strongest influence on fertility levels to launch BKKBN targeting efforts in seeking population control. The result of the largest Chi-square test is female sterilization, which is 28.624. From the data, it can be concluded that the fertility rate/number of children 2 or >2 is mostly affected by the use of female sterilization contraceptives, and female sterilization is the most effective contraceptive method. This tool can help BKKBN in achieving the target.
Co-Authors Adisty, Fahliza Ahmad Sugarda Ainun Palihah Ananda, Lyra Anggi Pranata Annisa, Nur Alvi Aprilia, Rima Arjuna, Dimas Bagus Aslam, Fazri Aulia Turrizqiya Auliya Ramadhani, Dhea Batu, Annisa Rajaq Lumban Batubara, Fikri Husin Bella Syahrani Nasution Blaster, Irena Br Siahaan, Erika Handayani Cynthia, Mayang Modelina Dara Nurul Hasnah dewi, mutia hatina Dian Darmawan Didik Santoso Didik Santoso Dinda Renata Cecilia Dwi Haprida Ningsih Elma Dwi Ariana Aprilia Zam Fachrur Rozi Fadhliyah, Annisa 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 M Agung Pradana Manurung, Silvi Khairiyah Maudya Nur Azura Mhd Ikhsan Rifki Mohammad Badri Muhammad Arfie Munawar Muhammad Farhan Mingka Muliawan, Hari Nadhila, Nurul Nasution, Alfina Febriani 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 Pohan, Siti Rolizah 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 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 Serdano, Akbar Sintia Agustina Siregar Siregar, Evi Borliana Siregar, Evi Borliana Siregar, Fadilatus Sahraini Siregar, Tanti Jumaisyaroh Siti Jubaidah 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