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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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ANALYSIS OF THE VISIT RATE AT THE IRIAN MARELAN SUPERMARKET DURING THE COVID-19 PANDEMIC Kartika , Dinda; Lubis, Riri Syafitri; Widyasari, Rina
Journal of Mathematics and Scientific Computing With Applications Vol. 2 No. 1 (2021)
Publisher : Pena Cendekia Insani

Currently our country is experiencing a disaster due to a very dangerous virus that has claimed many lives or commonly referred to as COVID-19. The government had limited the operating hours of public places to prevent the spread of the virus. This has resulted in disruption of economic activities, one of which is the Irian Supermarket & Dept Store. This research was conducted to determine how the level of visits to Irian with the Spearman Rank Correlation method. From the results of the Spearman Rank correlation analysis carried out, the calculated value is 0.307 with a positive sign which indicates a low level of relationship and it is concluded that the level of visits is not influenced by the application of health protocols but is influenced by facilities and sales techniques, This can also be seen in the results of the t-test. The result of count obtained is 3.20 shows that the variable level of visits has a significant correlation with purchasing decisions.

M/G/1 QUEUE WITH SINGLE WORKING VACATION AND VACATION INTERRUPTION TO THE EXPECTED VALUE OF MANY CUSTOMERSAT BANK MUAMALAT SUKARAMAI SUB-BRANCH OFFICE Susilowati, Rahmi; Lubis, Riri Syafitri; Widyasari, Rina
Journal of Mathematics and Scientific Computing With Applications Vol. 2 No. 1 (2021)
Publisher : Pena Cendekia Insani

Queuing occurs because the number of customers who arrive exceeds the service capacity, so customers have to queue to be served. A working vacation is a server serving at a slower speed. The server can return to a busy period with a (vacation interruption) opportunity or continue a vacation with a opportunity, with the single working vacation and vacation interruption method. The objective of this study is to obtain the effect of service rate and the expected value of the number of customers in the system after the departure of one customer and minimize operating costs during the vacation period (pause). The M / G / 1 queue study with Single Working Vacation and Vacation Interruption found that the average arrival rate (?) was 0.069 and the average service rate was 1.5 with the average vacation time (?) was 0, 41 and the average value of the expected number of customers in the system is 0,19 and for operating costs it can also be drunk to -16,38. This means that the queuing system is not efficient, due to the low level of server activity and the expected value of the number of customers in the system is 0 or there are no customers waiting in the system.

POPULATION PROJECTION AND FACTOR ANALYSIS AFFECTING POPULATION GROWTH IN THE CITY MEDAN USING NON LINEAR TRENDS POLYNOMIC METHOD Pertiwi, Fina Nur; Lubis, Riri Syafitri; Widyasari, Rina
Journal of Mathematics and Scientific Computing With Applications Vol. 2 No. 1 (2021)
Publisher : Pena Cendekia Insani

Non-linear trend is a measure of trend that has a model with quadratic equations, cubic and so on. The purpose of this research is to determine the population projection in Medan using a non-linear trend of the polynomial method (parabolic trend / quadratic trend) and to determine the factors that influence population growth in the city of Medan. From the results of data processing using the non-linear trend of the polynomial method, it is obtained that the projected number of population in 2029 will be 2645501 people, with The total male population is 1314713 and the female population is 1330788. When compared with the population in previous years, it can be seen that until 2029 the population in Medan will increase. Based on the research results from the factor analysis, it is known that the factors that are formed from the factor analysis process can be concluded that all the factors formed affect the population growth rate of Medan. The factors formed are birth (fertility), death (mortality) and migration.

Analisa Manajemen Waktu Pelaksanaan Administrasi Di Dinas Kehutanan Provinsi Sumatera Utara Dengan Metode CPM Hasibuan, Elpita Sari; Siregar, Evi Borliana; Batubara, Fikri Husin; Rambe, Muhammad Vikry Rezky; Lubis, Riri Syafitri
Jurnal IPTEK Bagi Masyarakat Vol 2 No 2 (2022)
Publisher : Ali Institute of Research and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55537/jibm.v2i2.233

Practical work (KP) is an academic activity that is oriented towards forms of student learning to develop and improve a quality workforce. By participating in practical work (KP) it is hoped that students will be able to add knowledge, skills and experience in preparing themselves to enter the real world of work. The problems that occur in the administration section are delays in the administrative process. So instead of practicing, try to use the CPM method to complete the administrative process to make it more efficient. The critical path can be found by looking at the total float resulting in a sum equal to 0 which is a critical activity and the critical path is found as follows: "1-3-4".

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.

Comparison of continuous review system method and min-max method in soybean inventory control Syafitri, Ellysa; Lubis, Riri Syafitri
Bulletin of Applied Mathematics and Mathematics Education Vol. 4 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/bamme.v4i2.11670

This study aims to compare the effectiveness of two inventory control methods, namely continuous review system and min-max in controlling soybean raw material inventory in tofu production. The continuous review system method is an inventory control system where raw material inventory is checked continuously while the min-max method is a method that maintains raw materials between the minimum and maximum limits. The data used are data on soybean raw material inventory and needs at the Ali Musa tofu factory in Serdang Bedagai Regency, Indonesia. Based on the results of the analysis of total inventory costs using the continuous review system method, it is IDR 418,978,693 in 2021 and IDR 430,271,763 in 2022. While the total inventory cost using the min-max method is IDR 366,272,031 in 2021 and IDR 367,964,100 in 2022. While the company uses IDR 429,321,708 in 2021 and IDR 445,381,200 in 2022. From the calculations above, the min-max method is more effective in reducing total inventory costs with infrequent ordering frequencies. Since orders are not made regularly, this strategy reduces the number of soybean orders and reduces the cost of ordering. When the reorder limit is reached, the company will place the order. The choice of inventory control method must be adjusted to the needs and operational characteristics of the company. The continuous review system method is better for companies with high and fluctuating raw material needs, while min-max can be used for companies with more stable raw material needs. The findings and the method used in this study could be beneficial for the factory to organize its inventory efficiently.

PENGEMBANGAN POCKET BOOK BERBASIS SCAFFOLDING Nadhila, Nurul; Nurmawati; Lubis, Riri Syafitri
Relevan : Jurnal Pendidikan Matematika Vol 1 No 1 (2021): Relevan : Jurnal Pendidikan Matematika
Publisher : Yayasan Amanah Nur Aman

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Tujuan dari penelitian ini adalah untuk mengembangkan produk berupa pocket bookberbasis scaffolding. Materi ajar yang diberikan peneliti adalah Limit Fungsi untuk siswa Kelas XI MA/SMA. Subjek dalam penelitian ini adalah siswa kelas XI MIA 2 SMAS Imelda Medan. Dalam penelitian ini, proses pengembangan pocket bookberbasis scaffolding mengacu pada model pengembangan 4D yang telah diubah menjadi 3D yaitu define (pendefinisian), design (perancangan) dan development (pengembangan). Validasi produk Pocket bookberbasis scaffolding mendapatkan nilai rata-rata validasi secara keseluruhan yaitu 4,22 yang masuk kategori baik. Untuk tingkat keefektifan pocket book terhadap kemampuan pemahaman matematis masuk ke dalam kategori sangat baik dengan persentase ketuntasan siswa pada saat pretes 6,67% menjadi 87% saat post test yang diyakinkan dengan dilakukannya uji t mendapatkan hasil t hitung yaitu 6,697 dan t tabel yaitu 2,145, dengan ketentuan t hitung > t tabel, yang artinya hasil uji t tersebut mengalami perbedaan yang signifikan. Kata Kunci: Pocket Book, Scaffolding, Kemampuan Pemahaman Matematis ABSTRACT The purpose of this research is to develop a product in the form of a scaffolding-based pocket book. The teaching material given by the researcher is Limit Function for Class XI MA/SMA students. The subjects in this study were students of class XI MIA 2 SMAS Imelda Medan. In this study, the process of developing a pocket bookbased on scaffolding refers to a 4D development model that has been converted into 3D, namely define, design and development. The validation of the scaffolding-based Pocket bookproduct got an overall average value of 4.22 which was in the good category. For the level of effectiveness of the pocket bookon mathematical understanding abilities, it is in the very good category with the percentage of students' completeness at the pretest 6.67% to 87% at the post-test which is convinced by the t-test to get the t-count results that is 6.697 and the t-table is 2.145, with the provisions of t arithmetic > t table, which means that the results of the t test have a significant difference. Keywords: Pocket Book, Scaffolding, Mathematical Understanding Abilities

EFEKTIVITAS STRATEGI INQUIRY DAN DISCOVERY LEARNING TERHADAP KEMAMPUAN PEMECAHAN MASALAH Palihah, Ainun; Nurmawati; Lubis, Riri Syafitri
Relevan : Jurnal Pendidikan Matematika Vol 1 No 2 (2021): Relevan : Jurnal Pendidikan Matematika
Publisher : Yayasan Amanah Nur Aman

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Penelitian ini bertujuan untuk mengetahui efektivitas strategi pembelajaran inquiry dan discovery learning terhadap kemampuan pemecahan masalah siswa pada pokok bahasan induksi matematika di kelas XI MAN 3 Mandailing Natal. Penelitian ini adalah penelitian kuantitatif, dengan jenis penelitian quasi eksperimen. Populasinya adalah seluruh kelas XI MIA MAN 3 Mandailing Natal. Dipilih sampel sebanyak 2 kelas, yaitu kelas XI MIA 1 dengan jumlah 20 siswa dan XI MIA 2 dengan jumlah 20 siswa. Analisis data dilakukan dengan uji independent sample t-test. Hasil temuan ini menunjukkan bahwa terdapat efektivitas penggunaan strategi pembelajaran inquiry dan discovery learning terhadap kemampuan pemecahan maslah siswa di kelas XI MIA 1 dan MIA 2 dengan nilai sig (2- tailed) atau P-value sebesar 0,008. Kesimpulannya terdapat efektivitas strategi pembelajaran inquiry dan discovery learning terhadap kemampuan pemecahan masalah siswa. Kata Kunci : Inquiry; Discovery Learning; Pemecahan Masalah. ABSTRACT This study aims to determine the effectiveness of inquiry learning and discovery learning strategies on students' problem solving abilities on the subject of mathematical induction in class XI MAN 3 Mandailing Natal. This research is a quantitative research, with a quasi-experimental type of research. The population is all class XI MIA MAN 3 Mandailing Natal. A sample of 2 classes was selected, namely class XI MIA 1 with 20 students and XI MIA 2 with 20 students. Data analysis was conducted by using independent sample t-test. These findings indicate that there is an effective use of inquiry learning and discovery learning strategies on the problem solving ability of students in class XI MIA 1 and MIA 2 with a sig (2-tailed) or P-value of 0.008. In conclusion, there is the effectiveness of inquiry learning and discovery learning strategies on students' problem solving abilities. Keywords : Inquiry; Discovery Learning; Solution to problem.

PERBEDAAN HASIL BELAJAR DAN MOTIVASI BELAJAR MODEL JIGSAW DAN TPS PADA MATERI PERSAMAAN LINEAR Pradana, M Agung; Santoso, Didik; 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 bertujuan untuk mengetahui perbedaan hasil belajar dan motivasi belajar siswa dengan menggunakan model pembelajaran kooperatif tipe Jigsaw dan tipe Think Pair Share pada materi SPLTV di kelas X SMA Gema Buwana. Penelitian ini adalah penelitian kuantitatif, dengan jenis penelitian eksperimen.Populasinya adalah seluruh siswa kelas X SMA Gema Buwana, tahun pelajaran 2021/2022 yang berjumlah 40 siswa. Analisis data dilakukan dengan analisis varians (ANAVA). Hasil temuan ini menunjukkan: (1) Terdapat perbedaan hasil belajar dan motivasi belajar siswa yang diajar menggunakan model pembelajaran kooperatif tipe Jigsaw dan tipe Think Pair Share pada materi SPLTV, dimana nilai Fhitung (4,142) > Ftabel (3,960); (2) Terdapat perbedaan hasil belajar siswa yang diajar menggunakan model pembelajaran kooperatif tipe Jigsaw dan tipe Think Pair Share pada materi SPLTV, dimana nilai Fhitung (5,954) > Ftabel (4,085); (3) Tidak terdapat perbedaan motivasi belajar siswa yang diajar menggunakan model pembelajaran kooperatif tipe Jigsaw dan tipe Think Pair Share pada materi SPLTV, dimana nilai Fhitung (0,7) < Ftabel (4,085). Simpulan penelitian ini menjelaskan bahwa hasil belajar dan motivasi belajar siswa lebih sesuai diajarkan dengan model pembelajaran kooperatif tipe Jigsaw dari pada tipe Think Pair Share. ABSTRACT This study aims to determine the differences in learning outcomes and students’ learning motivation using the Jigsaw type cooperative learning model and the Think Pair Share type in SPLTV material in class X SMA Gema Buwana. This research is a quantitative research, with the type of experimental research. The population is all students of class X SMA GemaBuwana, academic year 2021/2022, totaling 40 students. Data analysis was performed by analysis of variance (ANOVA). These finding indicate; (1) There are differences in learning outcomes and learning motivation of students who are taught using the Jigsaw type cooperative learning model and the Think Pair Share type in SPLTV material, where the valueFcount (4.142) > Ftable (3.960); (2) There are differences in student learning outcomes who are taught using the Jigsaw type cooperative learning model and the Think Pair Share type in SPLTV material, where the value of Fcount (5.954) > Ftable (4.085); (3) There is no difference in the learning motivation of students who are taught using the Jigsaw type cooperative learning model and the Think Pair Share type in SPLTV material, where the value of Fcount (0.7) < Ftable (4.085). The conclusion of this study explains that learning outcomes and student motivation are more suitable to be taught with the Jigsaw type of cooperative learning model than the Think Pair Share type.

PENGARUH MODEL PEMBELAJARAN TGT DAN TTW TERHADAP KEAKTIFAN DAN HASIL BELAJAR SISWA Siregar, Fadilatus Sahraini; Neliwati; 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 bertujuan untuk mengetahui Pengaruh Model Pembelajaran Teams Games Tournament Dan Think Talk Write Terhadap Keaktifan Dan Hasil Belajar Matematika Siswa Pada Materi Persamaan Kuadrat. Penelitian ini adalah penelitian kuantitatif, dengan jenis penelitian quasi eksperimen. Analisis data dilakukan dengan analisis varian (ANAVA). Hasil temuan ini menunjukkan: 1) Terdapat pengaruh pembelajaran menggunakan model pembelajaran teams games tournament dan think talk write terhadap keaktifan belajar matematika siswa pada materi persamaan kuadrat, dengan Fhitung = 7,813 > Ftabel pada taraf (a=0,05) = 4,043; 2) Tidak terdapat perngaruh model pembelajaran teams games tournament dan think talk write terhadap hasil belajar matematika siswa pada materi persamaan kuadrat, dengan Fhitung =2,157 < Ftabel pada taraf (a = 0,05) = 4,043 ; 3) Terdapat pengaruh model pembelajaran teams games tournament dan think talk write terhadap keaktifan dan hasil belajar siswa pada materi persamaan kuadrat, denganFhitung = 1,061 > Ftabel pada taraf (a = 0,05) = 10,004. Simpulan alam penelitianini menjelaskan bahwa kaktifan dan hasil belajar matematika siswa lebih baik diajarkan menggunakan model pembelajaran Teams Games Tournament (TGT) lebih berpengaruh dari pada model pembelajaran Think Talk Write (TTW). ABSTRACT This study aims to determine the effect of the Teams Games Tournament and Think Talk Write Learning Model on Student Activity and Learning Outcomes in the Quadratic Equation. This research is a quantitative research, with a quasi-experimental type of research. Data analysis was performedby analysis of variance (ANOVA). These findings indicate: 1) There is an effect of learning using the teams games tournament and think talk write learning models on students' learning activities in mathematics in the quadratic equation material, with Fcount = 7,813> Ftable at level (a=0,05) = 4.043; 2) There is no influence of the learning model of the teams games tournament and think talk write on the students' mathematics learning outcomes in the quadratic equation material, with F_count=2.157<F_table at level (a=0.05)=4.043 ; 3) There is an effect of the learning model of teams games tournament and think talk write on the activity and learning outcomes of students in the quadratic equation material, with F_count=1.061>F_table at level (a=0.05)=10.004. The conclusion of this study is that students' activities and learning outcomes are better taught using the Teams Games Tournament (TGT) learning model, which is more influential than the Think Talk Write (TTW) learning model.

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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