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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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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.

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

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

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 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

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

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)

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)

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)

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.

PENGEMBANGAN VIDEO PEMBELAJARAN MATEMATIKA BERBASIS ADVANCE ORGANIZER Turrizqiya, Aulia; Syafitri Lubis, Riri
Algebra : Jurnal Pendidikan, Sosial dan Sains Vol 3 No 4 (2023): ALGEBRA : JURNAL PENDIDIKAN, SOSIAL DAN SAINS
Publisher : Yayasan Amanah Nur Aman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58432/algebra.v3i4.228

ABSTRAK Penelitian ini bertujuan untuk melihat proses pembuatan video pembelajaran berdasarkan model pengembangan ADDIE, melihat tingkat kevalidan, kepraktisan dan keefektifan dari media pembelajaran Advance Organizer berbantuan pendekatan open ended pada materi persamaan dan fungsi kuadrat. Subjek pada penelitian ini yaitu peserta didik di kelas X IPA 1SMA 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 dilakukandengan5 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. Kata Kunci: Pengembangan; Media Pembelajaran; Advance Organizer; Open Ended; ADDIE. ABSTRACT This research aims to look at the process of making learning videos based on the ADDIE development model, looking at the level of validity, practicality and effectiveness of the Advance Organizer learning media assisted by an open ended approach to the material on equations and quadratic functions. The subjects in this research were students in class X Science 1 Darussalam High School, totaling 25 students. The instrument in this research uses a questionnaire to see the validity and practicality of the media and a test of student learning outcomes to see the level of effectiveness of the media being developed. The making of this video was carried out in 5 stages, namely analysis, design, development, implementation (implementation) and evaluation (evaluation). The results of this research show that the level of validity of the learning media is 2.7 in the good/fairly valid category. The level of practicality of learning media based on the student response questionnaire was 3.53 in the not good/less practical category and the mathematics teacher response questionnaire was 4.64 in the good/quite practical category. Meanwhile, the level of effectiveness of the learning media based on the results of calculating the validity of the test question instrument using the product moment correlation formula with rough numbers obtained an average of 0.869 in the very high category. The tcount value is 8.434 and the ttable value is 0.396, so the significance test question instrument has an error level of α = 0.05 or 5%. The average percentage of students' classical completeness is 80% in the good category, so this learning media is said to be effective. Keywords: Development; Instructional Media; Advance Organizer; Open Ended; ADDIE.

Co-Authors Adisty, Fahliza Ahmad Sugarda Ainun Palihah Almira Amir Ananda, Lyra Anggi Pranata Annisa, Nur Alvi Aprilia, Rima Arjuna, Dimas Bagus Aslam, Fazri Aulia Turrizqiya Auliya Ramadhani, Dhea Batu, Annisa Rajaq Lumban 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 Elpita Sari Hasibuan Evi Borliana Siregar Fachrur Rozi Fadhliyah, Annisa Fadilatus Sahraini Siregar Fadillah, Yanna Rezki Fajriana, Fajriana Farwansyah, Mhd Rio Fatmawati, Ayu Isnaini Fernando, Anjas Fikri Husin Batubara Fuja Nauli Pasaribu Giawa, Freddy Gishela Agra Moukia Gurusinga, Ditha Aulia Harleni, Harleni Harleni, Silvia Hasibuan, Hani Maulida 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 Kurahman, Panca Taufik Latersia, Egya Dora Lisa Setia Ningsih M Agung Pradana Manurung, Silvi Khairiyah Maudya Nur Azura Mhd Ikhsan Rifki Mohammad Badri Muhamar Chaniago, Febri Muhammad Arfie Munawar Muhammad Farhan Mingka Muhammad Vikry Rezky Rambe Muliawan, Hari Nabilla, Widi Ihdina Nadhila, Nurul Nasution, Alfina Febriani Nasution, Dafa Al Qifti Nasution, Fakhrur Rozi 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, Ahmad Syahrial Pohan, Siti Rolizah Pradana, M Agung Prasetya, Nurul Huda Pratiwi, Miftah Pulungan, Ahmad Fauzan Putri Harahap, Rahmelia Rahayu, Sri Ulfa Rahmat Darmawan, Rahmat Rakhmawati, Fibri 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 Simamora, Devitasari Sintia Agustina Siregar Siregar, Evi Borliana Siregar, Fadilatus Sahraini Siregar, Tanti Jumaisyaroh Siti Jubaidah Siti Zunaida Nasution Suci Dahlya Narpila, Suci Dahlya 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 Tanjung, Aida Febriana Tanti Jumaisyaroh Siregar Tri Amisri, Nurul Hasanah Tri Handayani Tri Lutfiah Wardah Turrizqiya, Aulia Utami, Destia Nada 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 Zahedi . Zakaria Alfikri Sirait Zam, Elma Dwi Ariana Aprilia

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