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All Journal Journal of the Indonesian Mathematical Society Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Indonesian Journal of Applied Mathematics
Dear Michiko Mutiara Noor
Program Studi Matematika, Institut Teknologi Sumatera, Lampung, Indonesia
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Mathematics Physics

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An Analysis of A Three-Phase Versus A Four-Phase Traffic Lights Regulation for A Four-Leg Intersection Pudjaprasetya, Sri Redjeki; Noor, Dear Michiko
Journal of the Indonesian Mathematical Society Volume 26 Number 2 (July 2020)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.26.2.823.192-201

Abstract

Traffic management of intersections is an important factor that can determine traffic density at the intersection, as well as its surrounding. Long traffic queues we encounter in daily life, were often caused by ineffectiveness of traffic lights management of the cross sections.In this article, an analytic study of traffic light management of a four-leg intersection, based on the kinematic LWR model, was presented. Comparison was based on observing the end of queues over three cycles of red-green lights, under the assumption of a constant traffic flux. On every leg of the intersection, the end of the queues were obtained from characteristic lines of the shock waves.From these observations, the three phase regulation was preferred over the four-phase one. Finally, a case study of Taman Sari - Baltos intersection located in Bandung City, Indonesia, was discussed. Parameter values used in these simulations were obtained from direct observation. 
An Analysis of A Three-Phase Versus A Four-Phase Traffic Lights Regulation for A Four-Leg Intersection Sri Redjeki Pudjaprasetya; Dear Michiko Noor
Journal of the Indonesian Mathematical Society Volume 26 Number 2 (July 2020)
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.26.2.823.192-201

Abstract

Traffic management of intersections is an important factor that can determine traffic density at the intersection, as well as its surrounding. Long traffic queues we encounter in daily life, were often caused by ineffectiveness of traffic lights management of the cross sections.In this article, an analytic study of traffic light management of a four-leg intersection, based on the kinematic LWR model, was presented. Comparison was based on observing the end of queues over three cycles of red-green lights, under the assumption of a constant traffic flux. On every leg of the intersection, the end of the queues were obtained from characteristic lines of the shock waves.From these observations, the three phase regulation was preferred over the four-phase one. Finally, a case study of Taman Sari - Baltos intersection located in Bandung City, Indonesia, was discussed. Parameter values used in these simulations were obtained from direct observation. 
Analisis Korelasi Luas Lahan Serta Ekspor Kopi Lampung Terhadap Ekspor Kopi Indonesia Rika Agustin; Dini Novita; Hendri Pratama; Safira Sela; Syahna Cyntia; Dear Michiko M. Noor
Indonesian Journal of Applied Mathematics Vol 1 No 1 (2020): Indonesian Journal of Applied Mathematics Vol. 1 No. 1 October Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

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

Abstract

Lampung merupakan produsen kopi terbesar kedua dan sumber pengekspor kopi pertama di Indonesia. Sementara Indonesia merupakan pengekspor kopi terbesar ke-4 di dunia. Kopi menjadi salah satu sumber pendapatan devisa utama negara. Paper ini membahas tentang hubungan antara luas lahan kopi di Indonesia dengan jumlah kopi yang diekspor. Hubungan antara eksport kopi lampung dengan eksport kopi Indonesia turut menjadi pokok bahasan utama pada jurnal ini. Data diperoleh dari Badan Pusat Statistik yang diolah secara kuantitatif. Pengolahan data dilakukan dengan menerapkan metode statistika non parametrik yaitu uji korelasi Spearman dengan bantuan SPSS 25. Hasil penelitian menunjukkan bahwa luas lahan kopi cukup berpengaruh terhadap jumlah ekspor kopi Indonesia, begitu pula dengan jumlah ekspor kopi Lampung yangpengaruhnya tinggi terhadap jumlah ekspor kopi Indonesia.
Numerical Simulation of Run-Up Wave Using Nonlinear Shallow Water Equations with Staggered Grid at Canti Beach, South Lampung Noor, Dear Michiko Mutiara; Faiqoh, Maya Himmah; Fauzi, Rifky
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 21 No. 2 (2024): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v21i2.16068

Abstract

Tsunamis, wave triggered by underwater earthquakes or volcanic eruptions, can achieve significant run-up heights upon reaching shore. Run-up refers to the maximum vertical distance a tsunami wave reaches above the normal sea level. This study employs a numerical model to simulate the run-up wave at Canti Beach, South Lampung Regency, during the 2018 Sunda Strait tsunami. The method approximates solutions to the shallow water model consisting of mass and momentum conservation equations using the finite difference method in staggered grid grids and incorporates the upwind method for nonlinear terms. Bathymetry data from GEBCO was projected in two dimensions using the haversine formula. The numerical scheme includes a wet-dry procedure for simulating run-up waves. Results indicate that waves with a 60-second period and 0.09-meter amplitude create a 40.0195-meter inundation area, although this amplitude is significantly lower than the observed data from the 2018 Sunda Strait tsunami. Additionally, a simulation with a 0.1-meter amplitude results in a 1.8299-meter run-up height, closely matching the observed data. This study demonstrates that nonlinear shallow water equations can effectively estimate run-up height and inundation area at Canti Beach.
Co-Authors Dini Novita Faiqoh, Maya Himmah Hendri Pratama Rifky Fauzi Rika Agustin Safira Sela Sri Redjeki Pudjaprasetya, Sri Redjeki Syahna Cyntia