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All Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat JURNAL PEMBELAJARAN DAN MATEMATIKA SIGMA (JPMS) Jurnal Absis : Jurnal Pendidikan Matematika dan Matematika International Journal of Applied Sciences and Smart Technologies Journal of Research in Mathematics Trends and Technology NUCLEUS: Jurnal Sains dan Teknologi Prima Abdika: Jurnal Pengabdian Masyarakat Griya Journal of Mathematics Education and Application Journal of Mathematics, Computation and Statistics (JMATHCOS)
Purba, Switamy Angnitha
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Agriculture, Biological Sciences & Forestry Arts Humanities Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Optimisasi Program Linear Pada Permasalahan Multikriteria Menggunakan Metode ε-constraint Purba, Switamy Angnitha; Afandi, Trisno; Fadhillah, Dinda Rizka; Wahyuni, Sri; Januarti, Ria
JURNAL PEMBELAJARAN DAN MATEMATIKA SIGMA (JPMS) Vol 9, No 2 (2023)
Publisher : Fakultas Keguruan dan Ilmu pendidikan (FKIP) Universitas Labuhan Batu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpms.v9i2.4274

Abstract

The purpose of this study is to solve multi-criteria problems using the ε-constraint method with the help of an excel solver. The multi-criteria optimization problem is an optimization problem that has more than one objective function. A multi-criteria optimization problem can be said to be a multiple criteria decision making (MCDM) if there is more than one thing that must be considered in the model as a goal or criterion. In general, the weighting method and the ε-constraint method are the most widely used. The weighting method converts a set of options into options by multiplying each option by the inventory weight. On the other hand, the ε-constraint method only saves one of the existing goals and limits the goals with a certain number of values to get an efficient limit.
Pembuatan Balsem Aromaterapi dari Minyak Atsiri Sereh Wangi (Cymbopogonnardus L. Rendle) Sylvi, Sylvi; Nelza, Novia; Purba, Switamy Angnitha
NUCLEUS Vol 4 No 2 (2023): NUCLEUS
Publisher : Neolectura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37010/nuc.v4i2.1368

Abstract

Essential oils are volatile oils or oil fly that is generally tangible fluid obtained from the plant roots, bark, stems, and leaves by steam distillation of water. Plants containing essential oils and has the potential to be developed is a plant citronella (Cymbopogon nardus L. Rendle). The purpose of this study to make products balm aromatherapy essential oils of citronella and test the quality of quality of the aromatherapy balm with water vapor distillation method. The collection of data obtained from the analysis is the analysis parameter identification of compounds, numbers ester, test Total Plate Count, testing Pb method of AAS, the, determination of the refractive index, the determination viksositas, determination of pH balm, and a test of endurance balm, saponification, test molds, metal test Cu and specific gramavity test, and analysis of quality parameters of essential oil (yield and organoleptic tests). Results of analysis of parameter numbers ester (17.6177; 17.7824; 18.5295), test Total Plate Count (0; 3 × 102 and 3 × 102), Pb metal test methods AAS (0.02895; 0.0145; 0.01445), the identification of compounds (+), 1.4675 refractive index, viksositas 439,89cp, 436,01cp, 419,57cp, pH 6 balm, balm endurance test, saponification 11:04; 16.66; 16.76, mold testing namely (-), Cu metal test 0.1743; 0.5242; 0.0222, testing the specific gramavity is 0898; 0.922; 0901. The result of the isolation of essential oils of citronella 27,000 gramam sample was obtained ± 62 mL with the results of citronella essential oil yield of 0.23% v / b; the identification of essential oils generally exhibit containing citronella essential oil.
Analisis Jaringan Kerja dengan Metode Critical Path Method (CPM) dan Model Program Linier Purba, Switamy Angnitha
Jurnal Absis: Jurnal Pendidikan Matematika dan Matematika Vol. 4 No. 1 (2021): Jurnal Absis
Publisher : Program Studi Pendidikan Matematika Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/absis.v4i1.993

Abstract

Network analysis is part of a project that requires time for each network activity. To produce a particular project there is more than one job/event that must be done. Each job/event is interconnected and placed in order according to the management of its implementation. In network projects, it is necessary to plan and supervise systematically, in order to obtain work efficiency. The network is represented in symbols and arrows. In this study, the problem-solving network analysis was solved using the CPM (Critical Path Method) method and with a linear programming model using the help of excel-solver and Lingo. This study aims to compare the two methods in solving network analysis problems. Based on the analysis, it is found that by using the CPM method, more critical paths are obtained than the linear programming method. With the increasing number of critical paths obtained, it is hoped that the management can determine project priorities to maintain the project schedule to be completed on time.
Estimasi Parameter Regresi Linier Sederhana Menggunakan Prosedur Cochrane-Orcutt, Hildreth-Lu dan First Differences Pada Metode Durbin Watson Purba, Switamy Angnitha; Chrisinta, Debora; Simarmata, Justin Eduardo
Journal of Mathematics, Computations and Statistics Vol. 6 No. 2 (2023): Volume 06 Nomor 02 (Oktober 2023)
Publisher : Jurusan Matematika FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to examine the problem of autocorrelation, simple regression analysis with errorsfollowing the form of first-order autoregressive, Durbin Watson method using the Cochrane-Orcutt,Hildreth-Lu procedures and first differences in overcoming autocorrelation. The occurrence ofautocorrelation causes the alleged regression parameter with ordinary least square (OLS) not to producethe actual value. Therefore, to obtain the actual parameters applied Durbin watson method with all threeprocedures. Based on the data used in this thesis quoted from the book Applied Linear Statistical ModelsFifth Edition, the best procedure is given by Hildreth-Lu because it produces the smallest mean squareerror (MSE) value namely 0,204. This is because, the process of estimating the autocorrelation coefficientis based on iterations until a minimum sum square error (SSE) value is found.
Penggunaan Memetic Algorithm Pada Penjadwalan Mesin untuk Meminimumkan Emisi Karbon Tampubolon, Ferdinan Rinaldo; Devita, Rischa; Siagian, Sinta Marito; HS, Samaria Chrisna; Purba, Switamy Angnitha; Sitinjak, Anna Angela
JURNAL PEMBELAJARAN DAN MATEMATIKA SIGMA (JPMS) Vol 10, No 1 (2024)
Publisher : Fakultas Keguruan dan Ilmu pendidikan (FKIP) Universitas Labuhan Batu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpms.v10i1.5121

Abstract

Isu lingkungan merupakan topik penelitian yang sering dilakukan akhir-akhir ini, salah isu tersebut adalah adalah emisi karbon. Salah satu gas emisi karbon terbesar muncul dari tindakan-tindakan manusia seperti transportasi, pertambangan, aktifitas konstruksi dan industri. Dari sisi operasional, strategi penjadwalan terbukti secara signifikan mengurangi emisi karbon. Strategi ini dianggap lebih efektif dan rendah biaya. Flexible Job Shop adalah salah satu jenis penjadwalan mesin pada industri dan merupakan pengembangan dari Job Shop. Kebanyakan penelitian terkait Flexible Job Shop menggunakan waktu pemerosesan bilangan crisp, pada kenyataannya faktor keterlibatan manusia, kerusakan mesin, maupun penurunan kinerja mesin mengakibatkan adanya ketidakpastian pada waktu pemerosesan pekerjaan, penelitian ini akan menyelesaikan Penjadwalan Flexible Job Shop dimana waktu pemerosesan dalam bentuk bilangan grey dengan dua fungsi tujuan yaitu makespan dan emisi karbon. Memetic Algorithm yaitu kombinasi algoritma NSGA-II dan Tabu Search digunakan untuk menyelesaikan kasus ini, hasil yang diproleh kombinasi algoritma ini memberikan hasil yang lebih baik dibandingkan penggunaan satu algoritma.
Analisis Tantangan, Peluang serta Implikasi Perbankan Digital terhadap Program Penjaminan Simpanan oleh LPS Purba, Switamy Angnitha; Tampubolon, Ferdinan; Angela Sitinjak, Anna; Nelza, Novia; Christine S. Purba, Darry
Griya Journal of Mathematics Education and Application Vol. 5 No. 3 (2025): September 2025
Publisher : Pendidikan Matematika FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/griya.v5i3.789

Abstract

Dewasa ini, teknologi informasi berkembang sangat cepat diberbagai bidang layanan salah satunya pada industri perbankan. Saat ini banyak bermunculan perbankan digital yang menawarkan berbagai fitur menarik dan kemudahannya. Namun tak dapat dipungkiri tingkat kepercayaan masyarakat masih terhitung besar pada perbankan konvensional dibandingkan perbankan digital. Lembaga Penjamin Simpanan (LPS) merupakan lembaga negara dengan status berbadan hukum yang independen, transparan dan akuntabel yang berfungsi menjamin simpanan nasabah penyimpan serta turut berperan aktif dalam memelihara stabilitas sistem perbankan sesuai dengan kewenangannya. Dengan adanya LPS diharapkan dapat memulihkan kepercayaan masyarakat terhadap sektor keuangan dan tidak khawatir untuk menyimpan uangnya di perbankan. Fokus penelitian ini adalah untuk mengetahui tantangan dan peluang perbankan digital serta implikasinya terhadap program penjaminan simpanan oleh LPS.
Visual aids for support teachers in learning Sirait, Debora; Simbolon, Lolyta Damora; Purba, Switamy Angnitha; Manulang, Ady Frenly
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2020): ABDIMAS TALENTA : Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (227.436 KB) | DOI: 10.32734/abdimastalenta.v5i2.4782

Abstract

Learning media in general is a tool for teaching and learning. Everything that can be used to stimulate the thoughts, feelings, attention and abilities or skills of students so as to encourage the learning process. This limitation is quite broad and includes the understanding of resources, environment, people and methods used for learning / training purposes. Barriers to the use of teaching aids in supporting student interest in learning, obstacles include: conditioning students' attention to learning with teaching aids, teacher learning methods that tend to be less varied so that students are less enthusiastic in learning if the teacher is monotonous, the teaching aids available in schools are incomplete, making teaching aids in accordance with the material and student input is difficult, the minimum time to prepare learning with teaching aids.
Comparison the adsorption of Pb with Ecofriendly Bio-Adsorbent From Rice Husk Ash and Boiler Fly Ash Tarigan, Enda Rasilta; Sitinjak, Anna Angela; Silalahi, Meriahni; Purba, Switamy Angnitha; Sitanggang, Yenny; Purba, Darry
International Journal of Applied Sciences and Smart Technologies Volume 06, Issue 1, June 2024
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v6i1.7173

Abstract

The amount of environmental pollution is in line with the increasing of industry. Industry can generate waste in the form of solid, liquid or gas. Utilization of waste as an adsorbent is a solution that can be done in dealing with waste such as metal waste contained in water. Therefore, this research aims to make a bio-adsorbent in the form of silica from rice husk ash and boiler fly ash and know the comparison of the Pb absorbed. The research method used is an experimental method by synthesizing the manufacture of silica. Then testing of Pb based on contact time was 30 minutes, 60 minutes, 90 minutes and 120 minutes. The results showed that the two silica-based bio-adsorbents could adsorb Pb. Bio-adsorbent from rice husk ash absorbed 56.51% of Pb in 30 minutes, 52.93% in 60 minutes, 48.65% in 90 minutes and 43.55% in 120 minutes. The bio-adsorbent from the fly ash boiler absorbed 50.15% of Pb in 30 minutes, 44.28% in 60 minutes, 38.48% in 90 minutes and 36.45% in 120 minutes. Bio-adsorbent from rice husk ash absorbs more Pb ions than from boiler fly ash. Because the silica in the rice husk ash forms a collection in the pores, whereas in the fly ash boiler there is silica that is spread out. This research can be a basis for further research in the form of dye bio-adsorbent products based on their short use time.
Sosialisasi Dasar Keselamatan dan Kesehatan Kerja Pengelasan untuk Pegawai PMT PTPN IV Dolok Ilir Sitepu, Evi Christiani; Purba, Switamy Angnitha; Sitinjak, Anna Angela; Lumbantoruan, Sorta; Kurnia, Dian; Saragih, Koko Pratama; Tarigan, Nurlianna; Manik, Toba Sastrawan; Maulidna, Maulidna; Nelza, Novia; Samiriadi, Samiriadi; Tambunan, Diman Raymond S
Prima Abdika: Jurnal Pengabdian Masyarakat Vol. 3 No. 3 (2023): Volume 3 Nomor 3 Tahun 2023
Publisher : Program Studi Pendidikan Guru Sekolah Dasar Universitas Flores Ende

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/abdika.v3i3.3052

Abstract

The application of Occupational Safety and health (K3) is very important in the work environment because it is closely related to the risk of accidents, safety and health when carrying out work. Various efforts have been made by the Tenera machinery factory (PMT) PTPN IV to minimize work accidents and diseases caused by work by installing warning signs, the use of complete personal protective equipment (PPE), providing good nutrition and regular health checks. However, the lack of awareness of K3 is still found in PMT PTPN IV Dolok Ilir workers. This can be seen from the still finding of minor work accidents and occupational health effects shown from the results of employee health reports. The methods used in this service activity are socialization, training, discussion on the basics of K3 welding for employees of PMT PTPN IV, so that factory employees are able to identify potential hazards that can occur in the workplace and accident prevention measures. The results of the socialization and training of welding K3 activities that have been carried out are expected to increase employee awareness of the importance of K3. So that the company is able to maintain the zero accident predicate.
The Application of Fisher Scoring Algorithm on Parameter Estimation of Normal Distributed Data Purba, Switamy Angnitha
Journal of Research in Mathematics Trends and Technology Vol. 3 No. 1 (2021): Journal of Research in Mathematics Trends and Technology (JoRMTT)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jormtt.v3i1.8345

Abstract

In statistics, parameter estimation is the estimation of a population using sample data. A population data certainly has a certain distribution. Fisher Scoring is a form of Newton's method which is commonly used in solving the maximum likelihood equation. The focus of this research is to estimate distributed data using the fisher scoring algorithm
Co-Authors Afandi, Trisno Angela Sitinjak, Anna Chrisinta, Debora Christine S. Purba, Darry Devita, Rischa Fadhillah, Dinda Rizka HS, Samaria Chrisna Januarti, Ria Kurnia, Dian Lumbantoruan, Sorta Manik, Toba Sastrawan Manulang, Ady Frenly Maulidna, Maulidna Nelza, Novia Purba, Darry Samiriadi, Samiriadi Saragih, Koko Pratama Siagian, Sinta Marito Silalahi, Meriahni Simarmata, Justin Eduardo Simbolon, Lolyta Damora Sirait, Debora Sitanggang, Yenny Sitepu, Evi Christiani Sry Wahyuni Sylvi, Sylvi Tambunan, Diman Raymond S Tampubolon, Ferdinan Tampubolon, Ferdinan Rinaldo Tarigan, Enda Rasilta Tarigan, Nurlianna