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All Journal International Journal of Electrical and Computer Engineering IAES International Journal of Artificial Intelligence (IJ-AI) Jurnal Teknik Industri Jurnal Sains dan Seni ITS KADIKMA Bulletin of Electrical Engineering and Informatics Bulletin of Electrical Engineering and Informatics UNEJ e-Proceeding Bulletin of Electrical Engineering and Informatics Jurnal Teknik Industri BAREKENG: Jurnal Ilmu Matematika dan Terapan JTAM (Jurnal Teori dan Aplikasi Matematika) Limits: Journal of Mathematics and Its Applications International Journal of Computing Science and Applied Mathematics Square : Journal of Mathematics and Mathematics Education Contemporary Mathematics and Applications (ConMathA) Science Nature
Dieky Adzkiya
Departemen Matematika Institut Teknologi Sepuluh Nopember
Arts Humanities Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Aliran Konveksi Campuran Magnetohidrodinamik yang Melewati Bola Bermagnet Lutfi Mardianto; Basuki Widodo; Dieky Adzkiya
Limits: Journal of Mathematics and Its Applications Vol 17, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/limits.v17i1.6752

Abstract

Permasalahan yang dibahas pada paper ini adalah aliran konveksi campuran magnetohidrodinamik (MHD) tak tunak dari fluida Newtonian yang melalui bola bermagnet. Persamaan pembangun dimensional terdiri dari persamaan kontinuitas, persamaan momentum dan persamaan energi. Persamaan ini diubah ke bentuk non-dimensional menggunakan variabel non-dimensional. Selnajutnya, semua persamaan dianalisis dengan teori lapisan batas dan ditransformasikan ke bentuk persamaan non-similar. Persamaan ini diselesaikan secara numerik menggunakan metode beda hingga skema implisit. Profil kecepatan dan temperatur di permukaan bola bermagnet ditentukan oleh beberapa parameter seperti bilangan Prandtl (Pr), parameter magnetik (M) dan parameter konveksi campuran (α). Gesekan kulit dan transfer panas dipelajari dan diinvestigasi selain kecepatan dan temperatur.
Safety Verification of Uncertain Max-Plus-Linear Systems Aditya Putra Pratama; Subchan Subchan; Dieky Adzkiya
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol 4, No 2 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (151.361 KB) | DOI: 10.12962/j24775401.v4i2.3454

Abstract

In this work, we discussed the verification of autonomous uncertain Max-Plus-Linear (uncertain MPL) systems with respect to safety property by using the reachability analysis approach. More precisely, given an uncertain MPL system, a nonempty set of initial conditions, a time horizon and an unsafe set, we want to determine whether the state can reach the unsafe set within the given time horizon. If the unsafe set is reachable, then the system is not safe. Otherwise, the system is safe. Our approach uses the piecewise affine representation of MPL systems to compute the reachable sets exactly.
Object Oriented Design of Software Tool for Finite Abstractions of Max-Plus-Linear Systems using Unified Modeling Language Muhammadun Muhammadun; Dieky Adzkiya; Imam Mukhlash
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol 3, No 1 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3814.194 KB) | DOI: 10.12962/j24775401.v3i1.2119

Abstract

Max-Plus-Linear (MPL) systems are a class of discrete-event systems with a continuous state space characterizing the timing of the underlying sequential discrete events. There is a formal approach to analyze these systems based on finite abstractions. The abstraction algorithms have been in MATLAB using list data structure and in JAVA using tree data structure. The MATLAB implementation requires long computational time, whereas the JAVA one requires larger memory allocation. In this work, we discuss an object oriented design in C++ using tree data structure without recursive functions in the hope of improving the results obtained by the two previous implementations.
H_∞ state feedback for linear systems with decentralized control inputs Helisyah Nur Fadhilah; Guisheng Zhai; Dieky Adzkiya; Erna Apriliani
SCIENCE NATURE Vol 2 No 4 (2019): SCIENCE NATURE
Publisher : Faculty of Mathematics and Natural Sciences, University of Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/SNvol2iss4pp219-231year2019

Abstract

This paper considers state feedback with decentralized structure for interconnected systems. The connection between subsystems is described by a directed graph. To design a decentralized controller, we use the information from its own subsystem and other subsystems based on the interconnection. Decentralized controller is defined as a solution of bilinear matrix inequality (BMI) problem, which is then solved by using the homotopy approach. Two numerical examples are performed to show validity of the design procedure
The Reduced Rank of Ensemble Kalman Filter to Estimate the Temperature of Non Isothermal Continue Stirred Tank Reactor Erna Apriliani; Dieky Adzkiya; Arief Baihaqi
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 13 No. 2 (2011): DECEMBER 2011
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (296.561 KB) | DOI: 10.9744/jti.13.2.107-112

Abstract

Kalman filter is an algorithm to estimate the state variable of dynamical stochastic system. The square root ensemble Kalman filter is an modification of Kalman filter. The square root ensemble Kalman filter is proposed to keep the computational stability and reduce the computational time. In this paper we study the efficiency of the reduced rank ensemble Kalman filter. We apply this algorithm to the non isothermal continue stirred tank reactor problem. We decompose the covariance of the ensemble estimation by using the singular value decomposition (the SVD), and then we reduced the rank of the diagonal matrix of those singular values. We make a simulation by using Matlab program. We took some the number of ensemble such as 100, 200 and 500. We compared the computational time and the accuracy between the square root ensemble Kalman filter and the ensemble Kalman filter. The reduced rank ensemble Kalman filter can’t be applied in this problem because the dimension of state variable is too less.
Profil Mikrorotasi dan Temperatur Aliran Magnetohidrodinamik Fluida Mikrokutub pada Bola Bermagnet Mufatin Fauziyah; Basuki Widodo; Dieky Adzkiya
Square : Journal of Mathematics and Mathematics Education Vol 4, No 1 (2022)
Publisher : UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/square.2022.4.1.9480

Abstract

Fluida mikrokutub adalah fluida dengan struktur mikro, yang terdiri dari partikel kaku yang berorientasi secara acak pada media kental yang memiliki kemampuan mikrorotasi. Penelitian ini difokuskan pada profil mikrorotasi dan temperatur aliran magnetohidrodinamik fluida mikrokutub pada bola bermagnet. Model dari permasalahan dibangun persamaan dimensional yang terdiri dari persamaan kontinuitas, persamaan momentum, persamaan momentum angular, dan persamaan energi. Model berdimensi tersebut ditransformasikan ke model tak berdimensi menggunakan variabel tak berdimensi. Selanjutnya model tak berdimensi diubah menjadi persamaan similaritas dengan menggunakan variabel similaritas. Persamaan similaritas diselesaikan secara numerik menggunakan metode beda hingga dengan skema implisit Euler. Hasil simulasi menunjukkan temperatur fluida naik seiring dengan meningkatnya parameter bahan mikrokutub. Sebaliknya, temperatur semakin turun dengan bertambahnya bilangan Prandtl. Profil mikrorotasi turun saat parameter bahan mikrokutub lebih besar sampai titik tertentu, kemudian berbalik semakin naik. Profil mikrorotasi semakin meningkat seiring dengan bertambahnya bilangan Prandtl.
COVID-19 Predictions Using Regression Growth Model in Ireland and Israel Wasim Raza; Dieky Adzkiya; Subchan Subchan; Saba Mehmood
JTAM (Jurnal Teori dan Aplikasi Matematika) Vol 6, No 4 (2022): October
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jtam.v6i4.10944

Abstract

The World Health Organization (WHO) asserted the recently discovered severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), also known as COVID-19, a pandemic on March 11, 2020. Since the genesis and growth mechanisms of this virus are unclear and impossible to detect, there are still many uncertainties concerning it and no vaccination or effective treatment. The main goal is to halt its global spread. This paper employed a regression growth model with an extended Weibull function on the dynamics of COVID-19 to make predictions about its spread. Our findings demonstrate the viability of using this model to forecast the spread of the virus. Using a logistic growth regression model, the note tabulates the COVID-19-related final epidemic sizes for a few sites, including Ireland and Israel.
MAGNETOHIDRODINAMIKA FLUIDA MIKROPOLAR PADA LAPISAN BATAS MELEWATI PELAT DATAR YANG DIPENGARUHI KONVEKSI CAMPURAN Jason Otniel Dharmanta; Basuki Widodo; Dieky Adzkiya; Chairul Imron
UNEJ e-Proceeding 2022: E-Prosiding Seminar Nasional Matematika, Geometri, Statistika, dan Komputasi (SeNa-MaGeStiK)
Publisher : UPT Penerbitan Universitas Jember

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

Abstract

This study considers about the magnetohydrodynamics of micropolar fluids in the boundary layer passing through a flat plate which is affected by mixed convection. The governing equations are obtained from the continuity, momentum, energy equations, and Maxwell’s equation. The micropolar fluid passes through the flat plate, flowing from the below. The obtained dimensional equations are then transformed into non-dimensional equations using non-dimensional variables, then transformed into similarity equations. The similarity equations can be introduced using stream functions, that produce non-linear partial differential equations. The equations are then solved by Keller-Box method. The numerical results obtained are in the form of temperature and fluid velocity profiles with variations in magnetic parameters, micropolar parameters, porosity parameters and Prandtl numbers. The numerical simulation results show that the greater the magnetic parameter (), the micropolar parameter () and the porosity parameter (), respectively, then the speed decreases but the temperature increases. However, the variation of the Prandtl numbers () does not affect the speed. The greater the Prandtl number, the lower the temperature. Keywords: Flat plate, Keller-Box, magnetohydrodynamics, micropolar fluid
Estimation of water momentum and propeller velocity in bow thruster model of autonomous surface vehicle using modified Kalman filter Hendro Nurhadi; Mayga Kiki; Dieky Adzkiya; Teguh Herlambang
International Journal of Electrical and Computer Engineering (IJECE) Vol 12, No 6: December 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v12i6.pp5988-5997

Abstract

Autonomous surface vehicle (ASV) is a vehicle in the form of an unmanned on-water surface vessel that can move automatically. As such, an automatic control system is essentially required. The bow thruster system functions as a propulsion control device in its operations. In this research, the water momentum and propeller velocity were estimated based on the dynamic bow thruster model. The estimation methods used is the Kalman filter (KF) and ensemble Kalman filter (EnKF). There are two scenarios: tunnel thruster condition and open-bladed thruster condition. The estimation results in the tunnel thruster condition showed that the root mean square error (RMSE) by the EnKF method was relatively smaller, that is, 0.7920 and 0.1352, while the estimation results in the open-bladed thruster condition showed that the RMSE by the KF method was relatively smaller, that is, 1.9957 and 2.0609.
PENERAPAN MODEL PREDICTIVE CONTROL (MPC) PADA FLOW LINE SISTEM PRODUKSI MENGGUNAKAN ALJABAR MAX-PLUS Imam Fauzi; Dieky Adzkiya
KadikmA Vol 13 No 1 (2022): April 2022
Publisher : Department of Mathematics Education , University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/kdma.v13i1.31309

Abstract

Model Predictive Control (MPC) is a controller design method is popularly used in the industrial world. This research will be presented at the MPC application of flow line production system modeled using max-plus linear systems. The main advantage of the MPC is its ability to provide certain constraints or limits on the control signal input and output. Flow line of production systems is a diagram illustrating the process sequence in the production system, ranging from the input, processing and output. Of flow line production system, be applicable MPC as time optimization control of the production process. Furthermore, the results of the input and output MPC construction of a flow line production system can be obtained by using matlab program
Co-Authors Aditya Putra Pratama Arief Baihaqi Arief Baihaqi Asmudik, Asmudik Basuki Widodo Chairul Imron, Chairul Dennis V. Madrigal Dinita Rahmalia, Dinita Eirene Juwita Ningtyas Pamela Erna Apriliani Fajar Annas Susanto Guisheng Zhai Hariyanto, Hariyanto Helisyah Nur Fadhilah Hendro Nurhadi Imam Fauzi Imam Mukhlash Jason Otniel Dharmanta Mardianto, Lutfi Mardlijah - Mayga Kiki Mochamad Satria Dharma Utama Mohamad Yusak Anshori Mufatin Fauziyah Muhammadun Muhammadun Muhammadun Riyanarto Sarno Saba Mehmood Sanjaya, Bandung Arry Subchan Subchan Subchan Subchan Teay Shawyun Teguh Herlambang Tri Rahayuningsih Wasim Raza Widya Nilam Rumana Yolanda Norasia