Journal of Science and Technology
JOSTECH focuses on the dissemination of scientific research in the field of Sains and Technology. We invite researchers, academics, practitioners to join us, submitting your original manuscripts. The JOSTECH encourages submission of the manuscript dealing with all sciences and technology aspects, but not limited to Mathematics and Information Technology
Articles
10 Documents
Search results for
, issue
"Vol 4, No 1: Maret 2024"
:
10 Documents
clear
<![CDATA[Aplikasi Metode Kendali LQR (Linier Quadratic Regulator) pada Sistem Suspensi Seperempat Mobil ]]>
<![CDATA[Asfa'ani, Ezhari]]>;
<![CDATA[Sari, Anisa Rizki]]>;
<![CDATA[Hasibuan, Lilis Harianti]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8345
<![CDATA[This research discusses the design of the Linear Quadratic Regulator (LQR) control method for car suspension systems. The car suspension systems considered are limited to quarter car models. The dynamic equations of the quarter car system are derived by applying Newton's Second Law. Next, a suspension system without control is compared with a suspension system that has been given control. The uncontrolled quarter car suspension system has an eigenvalue of -1.3658 + 0.0000i; 0.9635 + 0.0000i; -0.0488 + 0.3156i and -0.0488 - 0.3156i which means the system is unstable. Meanwhile, the quarter car suspension system that has been given LQR control has an eigenvalue of -111.8113; -74.4464; -36.9243 and -14.0242 which means the system is asymptotically stable. Based on eigenvalue analysis and numerical simulation, LQR control can stabilize the quarter car suspension system.]]>
<![CDATA[Barisan Cauchy pada Ruang Semimetrik Terbatas ]]>
<![CDATA[Rianjaya, Ilham Dangu]]>;
<![CDATA[Putri, Amelia]]>;
<![CDATA[Musthofa, Syarto]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8234
<![CDATA[Semimetric spaces with bounded property means that it is bounded below and bounded above by constant multiples of a metric space. Moreover, in semimetric spaces, every convergent sequence is not necessarily to be a Cauchy sequence. This study aims to examine the property of sequences of semimetric spaces with boundary property. In this work, analytical method of proof is used. The results obtained are the equivalence of the convergence of the sequence, and the fulfillment of the Cauchy criterion in the finite semimetric space and the metric space that bounds it. In addition, the completeness property in one space also causes the other space to fulfill the completeness property.]]>
<![CDATA[Analisis Sensitivitas dalam Optimalisasi Produksi UD Mekar Sari Karang Klesem Menggunakan Program Linier dengan Metode Simpleks Diperbaiki ]]>
<![CDATA[Winarni, Ambar]]>;
<![CDATA[Kartika, Dwiani Listya]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8231
<![CDATA[The research aimed to optimize the production of crackers in order to achieve maximum profit at the UD Mekar Sari Karangklesem factory by applying the simplex method. This research used a descriptive quantitative research approach and literature study methods to support the preparation of this research. The data used is secondary data which includes the amount of each raw material needed, the purchase price of each raw material, the selling price of each type of cracker and the yield of each type of cracker produced. UD Mekar Sari is a cracker factory that produces gendar crackers, soto crackers, onion crackers and makaroni crackers. The results of this study indicate that after going through the steps of the simplex method which was improved it was found that an optimum profit of IDR 11,530,000 would be achieved by producing 200 kg of gendar crackers, 80 kg of soto crackers, 100 kg of onion crackers and 80 kg of makaroni crackers . Based on the data on the composition and supply of raw materials for the production of the four types of crackers, data analysis and processing can be carried out by formulating them into a linear program using the improved simplex method. This method is considered more efficient than the improved simplex method. The results of the sensitivity analysis that only limited changes in coefficient value at objective function (the profit each crackers) and the constants right side constraints (the capacity of supply of the raw materials) show that profit remain in optimal condition if the change of coefficient value at objective function and the constants right side constraints between the range being resulted.]]>
<![CDATA[Pemodelan Matematika dan Analisis Kestabilan Model Pada Penyebaran HIV/AIDS Tipe SITA (Susceptible, Infected, Treatment, AIDS) ]]>
<![CDATA[Mahuda, Isnaini]]>;
<![CDATA[Rofiroh, Rofiroh]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8323
<![CDATA[HIV/AIDS still become a major public health problem that occurs in almost all countries in the world. Until now, no medicine has been found that can treat HIV/AIDS. However, there is therapy or treatment that can be done to slow the spread of the virus, namely antiretroviral (ARV) or called Antiretroviral Therapy (ART). The mathematical modeling carried out in this study uses the SITA type where there are 4 compartments, namely Susceptible (S), Infected (I) Treatment (T), and AIDS (A) in a closed population. The objectives of this research are: 1) to construct a mathematical model for the spread of SITA type HIV/AIDS, 2) determine the equilibrium point and stability of the equilibrium point of the model, 3) determine the basic reproduction number (R_0), and 4) carry out a dynamic simulation of the model. Mathematical modeling of the spread of SITA type HIV/AIDS produces two equilibrium points, namely the disease-free equilibrium point (E_1) and the endemik equilibrium point (E_2). From the results of the analysis, the basic reproduction ratio (R_0) was also obtained by building a matrix called the Next Generation Matrix (NGM). The basic reproduction ratio number (R_0) also determines the existence and stability of the equilibrium point and can control the rate of spread of HIV/AIDS. Based on the simulation results, the parameter value that greatly influences population dynamics is the rate of treatment given to the Infected (I) sub population.]]>
<![CDATA[Penerapan ARIMA Pada Data Curah Hujan di Stasiun Meteorologi Kelas II Minangkabau Padang Pariaman ]]>
<![CDATA[Nur, Rizki Amalia]]>;
<![CDATA[Putri, Darvi Mailisa]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8361
<![CDATA[Rainfall is one of the indicators of climate change that has an impact. Class II Minangkabau Meteorological Station Padang Pariaman is one of the locations that has an impact on rainfall. This location is Minangkabau International Airport so that rainfall information is very important. The rainfall data used in this study is monthly data with the period January 2017 to June 2022. The ARIMA model is applied to perform forecasting or prediction of rainfall data for the next period. The results of the study based on the analysis of the Akaike Information Criterion (AIC) value obtained the best model ARIMA (3,1,0).]]>
<![CDATA[Perapan Metode Double Exponential Smoothing pada Prediksi Nilai Tukar Petani di Provinsi Sumatra Barat Tahun 2023 ]]>
<![CDATA[Yulia, Rahma]]>;
<![CDATA[Jannah, Miftahul]]>;
<![CDATA[Syafi'i, Mohamad]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8195
<![CDATA[West Sumatra is one of the provinces in Indonesia where the agricultural sector is very important for the regional economy. To encourage the development of the agricultural sector, an appropriate strategy is needed for each location. One of the efforts to encourage the development of the agricultural sector is to pay attention to the availability of agricultural facilities and infrastructure, so that there are no obstacles for producers that increase production costs and harm farmers. The purpose of this study was to determine the model and prediction results of Farmer Exchange Rate in West Sumatra using the Double Exponential Smoothing Method from January 2023 to June 2023. The prediction equation for NTP in West Sumatra Province in 2023 obtained is 〖 F〗_(t+m)=110,5049+(m)0,1773with a value of α = 0.99, β = 0.0115 and MAPE value = 0.99%. The Exchange Rate in West Sumatra from January 2023 to June 2023 tends to increase. The increasing Farmer Exchange Rate in West Sumatra can have a positive impact on the agricultural sector and improve the economic welfare of farmers.]]>
<![CDATA[Perancangan Job Seeker - Aplikasi Pencari Kerja Menggunakan PHP dan MYSQL ]]>
<![CDATA[Kurnia, Rahmi Putri]]>;
<![CDATA[Sy, Yulia Jihan]]>;
<![CDATA[Zalmi, Wahyuni Fithratul]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8246
<![CDATA[Job vacancies are information that is really needed by many people with a very fast update rate, because it is related to the acceptance deadline. Speed of information and suitability of abilities are basic criteria in the job search process when applying for jobs. However, the distribution of this information is quite difficult to obtain when you have to look for the source of the information in certain places first. For this reason, a solution is needed to simplify these difficulties. The software development methodology used in the system development process is the waterfall methodology. In this methodology, several steps are taken to build software, namely software engineering, system analysis, system design, system implementation, system testing. By carrying out stages based on the methodology, it is hoped that the application will be built according to needs and can be used by consumers. The Job Seeker Application is an application that can help disseminate job vacancy information for job seekers and employers to assist the job application process directly for job seekers.]]>
<![CDATA[Penyisipan Data Secara Reversible Pada Gambar Medis Menggunakan Metode Difference Expansion of Quad dan Fungsi Modulus ]]>
<![CDATA[Arham, Aulia]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8257
<![CDATA[The rapid advancement of the Internet of Things (IoT) brings convenience across various domains, but raises its own challenges, particularly concerning data security and privacy. Cryptography and steganography are two techniques used to secure data. Cryptography protects information by encrypting messages, while steganography hides the existence of data in other media. The embedding of data into other media like medical images necessitates specialized approaches to prevent potential distortion that may compromise their integrity. Distortion in medical images could lead to erroneous diagnoses. In this study, we introduce a reversible data embedding technique capable of returning storage media to its original state without distortion, utilizing the Difference Expansion of Quad and Modulus Function. This approach employs 2×2 pixel blocks to embed 3-bits of data. Our experiments on six medical images demonstrate that the proposed method offers substantial embedding capacity while maintaining high visual quality. The embedding capacity can reach 0.4834 bits per pixel (bpp) with a PSNR of 49.4330 dB. Experimental findings indicate that the proposed method outperforms previous techniques.]]>
<![CDATA[Implementation of Cryptography Using the RSA (Rivest-Shamir-Adleman) Algorithm in Encoding Text Messages and Documents ]]>
<![CDATA[Sari, Septi Rahmita]]>;
<![CDATA[Resmawan, Resmawan]]>;
<![CDATA[Yahya, Nisky Imansyah]]>;
<![CDATA[Yahya, Lailany]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8280
<![CDATA[Cryptography can be used in prevent data, one of the preventive measures is by encoding messages. Cryptography is the study of encoding messages or ways of data protection. In encoding the content of messages, there is an algorithm conventionally used nowadays, the RSA (Rivest-Shamir-Adleman) algorithm. The RSA algorithm is a method that has two different keys for each encryption and decryption process but is still interrelated to maintain security in processing the data. In finding the key, the RSA algorithm utilizes the rule of prime number. The larger the prime number used as a key, the harder it is to find a large number as a factor. This research describes the process of encrypting text messages, the content of documents using the RSA algorithm, and the key generation process. Those processes are done by converting plaintext into ciphertext using ASCII code, which is 256 long, and using PKCS (Public Key Cryptography Standards) is the encryption process on the RSA algorithm. This study uses Pyhton programming language to implement the RSA algorithm on text messages and documents. As a recommendation to the subsequent studies, it is proper to use algorithms or other programming languages to secure messages.]]>
<![CDATA[Suatu fq-Derivasi pada BE-Aljabar ]]>
<![CDATA[Jayanti, Endah Dwi]]>
<![CDATA[ JOSTECH Journal of Science and Technology Vol 4, No 1: Maret 2024 ]]>
Publisher : <![CDATA[UIN Imam Bonjol Padang ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.15548/jostech.v4i1.8376
<![CDATA[In this article, the concept of f_q-derivation in BE-algebra is given by first defining a mapping φ_q^f, which is a self-map of BE-algebra. Based on this definition, the concept of f_q-derivation in BE-algebra is constructed. The results of this research are the definition of f_q-derivation in BE-algebra and its properties. These properties are constructed from the mapping φ_q^f, regular, fixed set, and kernel of a f_q-derivation in BE-algebra.]]>
