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STRING (Satuan Tulisan Riset dan Inovasi Teknologi)
Published by Universitas Indraprasta PGRI
ISSN : 25279661     EISSN : 25492837     DOI : http://dx.doi.org/10.30998/string.v4i3.6197
Core Subject : Science, Education,
Computer Science & IT Mathematics
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) focuses on the publication of the results of scientific research related to the science and technology. STRING publishes scholarly articles in Science and Technology Focus and Scope Covering: 1. Computing and Informatics 2. Industrial Engineering 3. Electrical Engineering 3. Mechanical Engineering 4. Applied Mathematical 5. Physics (Classical and modern) 6. Mathematics and Science
Arjuna Subject : Ilmu Komputer (semua kategori) - Teori Komputasi dan Matematika
Articles 373 Documents
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Persamaan Gerak Vertikal ke Bawah Dipengaruhi Gaya Gesek Udara Menggunakan Theorema Lagrange Supriadi, Bambang; Alivia, Haniyah; Wahyudianti, Ratih; Al Bawani, Amar Ma’ruf
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 2 (2023)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i2.17839

Abstract

Many physics concepts are still not explained using mechanical equations, such as Newtonian and Lagrangian, especially in the context of downwardly vertical motion. This research investigates aspects of downwardly vertical motion that may or may not be affected by air friction. To examine this phenomenon, the researchers detail and compare the Newtonian and Lagrangian equations. Apart from that, there is a need for extensive literature studies on classical mechanics, including these theories (Newtonian, Lagrangian, and Hamiltonian). The method used in this study is a mathematical theoretical study by calculating the equation of downwardly vertical motion using partial differential equations from the Lagrangian equation to obtain the equation of downwardly vertical motion which is influenced by air friction. The results of this research reveal three Lagrange equations, namely the equations for acceleration, speed and position in the context of vertical motion which are influenced by air friction.
Implementasi E-Government pada Pemerintah Desa Berbasis Android dengan Metode Waterfall Wiyanto, Wiyanto; Fauzi, Anwar; Gopar, Ida Abdul; Raharjo, Sugeng Budi
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 2 (2023)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i2.16621

Abstract

Making population documents such as cover letters, certificates, business permits and other documents is still often done conventionally in services to the community, that is, people have to come directly to the Village Head's office. The required documents are completed within 2 - 3 days from submitting the application, so it is inefficient for residents who live outside the city. Based on these problems, the researcher intends to help overcome the problems that exist at the Ganggeng Village Office to facilitate the administration of population documents such as cover letters, certificates, business permits and other letters to be more effective and efficient. The method used in this research is the waterfall method and base on  Android. The results of this research are the implementation of e-Government in the Village Government in providing document and correspondence creation services, so that it becomes more efficient in serving the community.
Pengendalian Persediaan Bahan Baku Menggunakan Metode Just in Time (JIT) di PT BMJ Wijoyo, Ujang Bagus Vikondani Castro; Sari, Rianita Puspa
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 9, No 1 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v9i1.22300

Abstract

Inventory management plays an important role in the company, all types of inventory need to be managed so that the efficiency of the production process can be guaranteed and produce quality products and in conditions of no defects. Therefore, the high demand that must be met according to consumer wishes and goods that do not meet the needs makes companies have to control the inventory of production raw materials so that there is no excess or shortage of stock. Thus, the purpose of this study is to help control excess inventory and reduce costs as low as possible. The method used in this study is Just in Time (JIT). Therefore, this study resulted in a difference in the estimated cost of storing raw materials every month before using JIT of Rp. 15,269,335 while the estimated cost of storing raw materials per month after using the Just in Time system was Rp. 7,634,667 so as to reduce the estimated cost of storing raw materials by Rp. 7,634,667. Therefore, the use of Just in Time can increase productivity by controlling the inventory.
Klasifikasi Bahan Biodegradable dan Non-Biodegradable Menggunakan Convolutional Neural Network (CNN) Latief, Muhammad Abdul; Azfa Riyyasy, Muhammad Rasikh; Ulya, Fadilla Zundina; Puspita, Popy Laras; Claudia, Gavrilla; Nabila, Luthfi Rakan
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 3 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i3.19314

Abstract

Deep Learning is a new scientific field in the field of Machine Learning which has recently developed. Deep Learning has excellent capabilities in computer vision. One of its uses is in the case of classifying objects into biodegradable and non-biodegradable materials. By implementing the CNN method in this case, it is possible to classify biodegradable and non-biodegradable waste appropriately and efficiently. This study uses image data of biodegradable and non-biodegradable materials sourced from Kaggle. The stages in this study consist of six stages. The first stage is to retrieve the dataset. The second stage is the preprocessing stage by rescaling the image. The third stage is to create a CNN model. The fourth stage is model training to get higher accuracy. The fifth stage is model evaluation and the last is testing the model. From the classification test using the CNN method, an accuracy of 93% is obtained. So it can be concluded that the CNN method used in this paper is capable of performing a good classification.
Analisis Pemilihan Vendor Solenoid Valve untuk PT XYZ Menggunakan Metode Analytical Hierarchy Process Hidayat, Muhammad Alif Lukman; Herwanto, Dene
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 3 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i3.19408

Abstract

Basically every company has the same principle, which is to make as much profit as possible using the minimum possible costs. This can be done in various ways, one of which is by choosing the right vendor. In selecting vendors, PT XYZ has used an application in the form of a website and has determined the criteria for selecting vendors. However, even though they have been assisted with using the application and have determined the criteria for selecting vendors, there are still problems in the procurement process such as goods arriving late or goods arriving not according to the specifications as agreed. Therefore, it is necessary to conduct research using the Analytical Hierarchy Process (AHP) method and add service criteria to find the best vendors to assist the production process at PT XYZ. This study aims to find the best vendor in the procurement of solenoid valve spare parts at PT XYZ based on the Analytical Hierarchy Process method. The research results obtained are that PT SMS is the best vendor as a supplier of solenoid valves with a value of 0.491, followed by PT VAI with a value of 0.291, and PT ACE with a value of 0.067. And for the sequence of criteria that are a priority for the procurement of solenoid valves, namely quality, price, delivery, and service.
Analisis Kualitas Produk Imprabox Menggunakan Metode Seven Tools Faurika, Rahmah; Fitriani, Risma; Rinaldi, Dimas Nurwinata
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 2 (2023)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i2.16999

Abstract

Product quality control is very important to pay attention to so that a company can continuously compete with other companies, increase its sales value, and get the trust of customers as its most important target. PT JP is an industrial company engaged in manufacturing with packaging products made from polypropylene/Impraboard, Cardboard Box, Polyethylene Foam, Spon Eva, and other packaging need materials. One of the products with a high sales rate is imprabox products. But, during the inspection process, there is a fairly high and diverse defect rate. Therefore, efforts are needed to minimize product defects using the basic seven tool method. This research begins with product inspection using a cheksheet in the QC (Quality Control) department. The inspection is carried out 23 times with a total of 3,256 items and 941 NG products. Furthermore, a flowchart is made to display the manufacturing process starting from marking, cutting, bending or fit up, welding, to finishing. Histogram is used to determine the variation of defects, in this case there are 12 types of defects including printing, EVA coating and NG cover. Pareto diagram is used to determine the dominant defects including in printing at 41.34%, Eva coating at 22.85% and NG cover at 11.265. Ishikawa/fishbone diagram is used to determine the causes of defects including human factors, machine factors, method factors and environmental factors. Scatter diagram is used to express the 77% relationship (correlation) between the variation in the number of defective products and the amount of production. The control diagram is used to analyze the control limits with UCL 40.9 and LCL 0.403.
Prediksi Kelulusan Siswa dengan Metode Support Vector Machine (SVM) di SMK Adiluhur Lukman, Lukman; Herlinda, Herlinda
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 9, No 1 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v9i1.23355

Abstract

Implementasi Black Box Testing pada Media Pembelajaran Berbasis Google Sites Ayuardini, Marisha; Yulistiana, Yulistiana; Kameswari, Dita; Damayanti, Zahra Ayu
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 9, No 1 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v9i1.20674

Abstract

The Google Sites application is an interactive multimedia which is one of the products of the Google company as a means of creating a site equivalent to a website. Biology is a science that is dominated by theory and is closely related to memorization and reading. So, in its application it requires good focus on the material being presented. One innovation that can be done is by designing interactive and creative learning media such as Google Sites. The Google Sites application is designed in the form of presenting learning material on the topic Biology of the Human Reproductive System as an effort to develop learning media and enrich creativity during learning. However, when developing learning media, of course you have to guarantee quality, performance and functionality, therefore it is important to test the system before the learning media is handed over to students. The aim of this research is to test Google Sites-based learning media using the black box testing method. Black box testing is a test that only tests the functionality of the system, in this case it only tests the input and output produced by the system. After black box testing was carried out, Google Sites based learning media was suitable for use with results that met expectations.
Analisis Produktivitas Mesin Cutting Menggunakan Metode Overall Equipment Effectiveness di PT ABC Fery Athallah, Muhammad; Nurul Azizah, Fahriza; Wahyudin, Wahyudin
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 3 (2024)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i3.20637

Abstract

Pengaruh Dosis Iradiasi Gamma terhadap Pengurangan Bobot Cabai Rawit sebagai Teknologi Pengawetan Makanan Ariyanti, Dhita; Megasari, Kartini; Ridho, Ridho; Adeska, Rieka Arkaninto; Akbar, Sulhamdi
STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Vol 8, No 2 (2023)
Publisher : Universitas Indraprasta PGRI Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/string.v8i2.17523

Abstract

Food technology as a source of human needs must receive a special attention. Various methods in pursuing food preservation technology are carried out in order to have a long shelf life. This study aims to reduce the percentage of weight loss of cayenne pepper through gamma irradiation technology. The research method used in the process of preserving pepper is gamma exposure irradiation at varying doses (1; 1.5; 2; and 2.5 kGy). Based on the research results, it can be concluded that gamma irradiation at doses of 1; 1.5; 2; and 2.5 kGy affected the weight loss of cayenne pepper. The 8th to 10th days of observation showed the highest percentage of weight loss which ranged from 5.58% to 18.71%, from the original (31.69% without gamma irradiation). Intracellularly, this means that there is a disruption of the fungal membrane in cayenne pepper which causes leakage of sugar and protein from damaged cells. In addition, irradiation disrupts the metabolic function of malate dehydrogenase (MDH) and succinate dehydrogenase (SDH) in the tricarboxylic acid cycle (TCA). This study was tested statistically with a single ANOVA, showing that gamma irradiation affected the weight loss of cayenne pepper as proved by the result of Fcrit (6.725) > Ftable (3.8852).

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