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All Journal Teknosains: Media Informasi Sains dan Teknologi Profesi Pendidikan Dasar Jurnal Matematika Sains dan Teknologi Jurnal Ilmiah Soulmath : Jurnal Edukasi Pendidikan Matematika JURTEKSI Dedication : Jurnal Pengabdian Masyarakat JURNAL PENDIDIKAN MIPA Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Jurnal IKA PGSD : Ikatan Alumni PGSD UNARS Jurnal Pendidikan dan Kewirausahaan JURNAL PENDIDIKAN, SAINS DAN TEKNOLOGI Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi As-Sidanah : Jurnal Pengabdian Masyarakat Indonesian Community Journal Dedication : Jurnal Pengabdian Masyarakat KOPEMAS International Journal of Computing Science and Applied Mathematics-IJCSAM
Darsih Idayani
Universitas Terbuka
Religion Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Mathematics Physics Public Health Social Sciences Other

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TRAINING AND ASSISTANCE IN USING GEOGEBRA TO IMPROVE THE COMPETENCE OF HIGH SCHOOL MATHEMATICS TEACHERS Darsih Idayani; Wahyu Hidayat; Selly Anastassia Amellia Kharis; Asmara Iriani Tarigan; Sumartono Sumartono
As-Sidanah Vol 6 No 1 (2024): APRIL
Publisher : LP2M Universitas Ibrahimy

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35316/assidanah.v6i1.182-192

Abstract

Mathematics teachers must adapt to technological developments in the digital era. Among other problems related to learning mathematics, students tend to feel bored and uninterested in mathematics. At the same time, most teachers need help keeping up with fast technology developments. The solution offered is training and mentoring activities for using the GeoGebra software in mathematics learning in South Tangerang City in collaboration with the Subject Teacher Deliberation of Mathematics or MGMP. The material presented was about introducing GeoGebra, graphs, and function operations. Moreover, it was about solving linear programming, geometry, and calculus in GeoGebra. The pretest and posttest results showed increased participants' knowledge about GeoGebra utilization. This condition is indicated by the significance value of the t-test, which is less than 0.05 and less than 0.001. In addition, activity evaluation was carried out by filling out evaluation forms and interviews. The evaluation results show that the training and mentoring activities have enabled participants to gain new knowledge about the GeoGebra as needed in teaching mathematics in high school.
Optimal Control of Multi-Supplier Inventory Management with Lead Time Darsih Idayani; Subchan Subchan
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol. 6 No. 1 (2020)
Publisher : LPPM Institut Teknologi Sepuluh Nopember

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

Abstract

In the current global competition, companies are required to save money in order to survive. One of the expenses that can be reduced is the cost of inventory control. To minimize these costs, we require a proper planning and management of the inventory. Ordering supplies should be performed at a certain time period, especially with uncertain demand. As such, the company must determine when to order at the suppliers and how many should be ordered. So there will be no excess inventory in the warehouse because of too much ordering or because of the inventory cannot meet demand due to late or too little order to suppliers. Consequently, in this research, a quadratic cost functional is used as the objective function in multi-supplier inventory management problem with different lead time. Optimal control theory, LQR (Linear Quadratic Regulator) is used to solve this problem. According to the simulation, we conclude that the smaller weight resulted in more optimal inventory cost.
Co-Authors Agatha Anggraeni Dewi Agus Firanto Asmara Iriani Tarigan Asmara Iriani Tarigan Asmul Faisi Binsar Samosir Elin Herlinawati Elin Herlinawati Hasoloan Siregar Hasoloan Siregar Heny Kurniawati Herlinawati, Elin Idah, Linatul Af Irma Noervadila Lisma Dian Kartika Sari Lisma Dian Kartika Sari Lisma Dian Kartika Sari Lisma Dian Kartikasari Muna, Siti Umamah Naili Nur Hasanah Nuril Firdausia Puspitasari, Yesi Ranindya Masyarah Gustiary Selly Anastassia Amellia Kharis Septiani, Pani Siti Umamah Naili Muna Subchan Subchan Subchan, Subchan Sumartono Sumartono Sumartono Susanti Tefa Tarigan, Asmara Iriani Tri Astindari Ummi Khairiyah Wahyu Hidayat Wahyu Hidayat Yesi Puspitasari Yesi Puspitasari Zainul Munawwir Zainul Munawwir