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INDONESIA
Jurnal Ilmiah Teknologi dan Rekayasa
Published by Universitas Gunadarma
ISSN : 14109093     EISSN : 20898088     DOI : http://dx.doi.org/10.35760/tr.
Core Subject : Science, Engineering,
Automotive Engineering Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Jurnal ini diterbitkan secara berkala tiga kali dalam setahun, April, Agustus, dan Desember. Artikel yang dimuat dalam jurnal ini merupakan artikel ilmiah hasil penelitian tentang teknologi dan rekayasa yang meliputi teknik informatika, teknik elektro, teknik mesin, dan teknik industri. Artikel dapat ditulis dalam bahasa indonesia maupun bahasa inggris.
Arjuna Subject : Ilmu Komputer (semua kategori) - Aplikasi Ilmu Komputer
Articles 8 Documents
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Search results for , issue "Vol 29, No 3 (2024)" : 8 Documents clear
THE CREATION OF HICHAT : SECURE MOBILE CHAT USING HYBRID CRYPTOSYSTEM Handayani, Linda
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.12515

Abstract

Security of chat transmission or exchange is very important in the application of communication. Secret messages are sent or exchanged through communication services in cyberspace where no other party should have authority other than the sender and recipient to protect against harm. This causes the need for a cryptographic system that is used to maintain security during the transmission or exchange of chats. Hybrid cryptosystem is a technique that combines symmetric and asymmetric encryption to create a safer and more efficient system. This study proposes the creation of a secure mobile-based chat application, namely Hichat, by combining the AES algorithm to encrypt chat and the RSA algorithm to create keys. The hash function is also used to authenticate API keys to server services. The purpose of this study is to create a secure mobile-based chat application that prioritizes confidentiality, integrity, authentication and non-repudiation. The functional testing carried out obtained results that all features were running well. Security testing was carried out using a sniffing technique attack which showed that the message information and API keys were encrypted and the scenario results showed that every aspect of security was successful. Then the application display is responsive on several devices.
USED PRINTER DISASSEMBLY PLANNING USING AGGREGATE PLANNING APPROACH AT RCM KOMPUTAMA Butar Butar, Maulida Boru; Zega, Alva Dika Howuhowu; Gunawan, Mahesa Khalifa
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.11940

Abstract

Indonesia generated an estimated 2 million tons of e-waste. This is expected to increase to 3.2 million tons by 2040. Printers as one of electronic waste (e-waste) can be harmful to the environment, then to reduce the environmental impact of printer disposal and the amount of e-waste that ends up in landfills, printers should be recycled before they are disposed of. This involves disassembling the printer and recycling parts and components. The disassembly process more challenging to plan and execute due to returned product type may vary from product that have been at end-of-life or damaged. Disassembly planning is the first step is to plan the disassembly process, which is important for optimizing the recycling process. Small repair shops are at the forefront of this endeavor, so ensuring their activities run smoothly is of utmost importance. The classic aggregate planning was introduced in disassembly process, considering its capability to coordinate and plan resource to satisfy customers’ demand. The research took place at RCM Komputama, a small printer repair shop in Depok. This research aimed to implement classic aggregate planning in disassembly process, so the repair shop could maximize the number of disassembled units as well as minimize the costs of the disassembly process. After implementing disassembly planning using aggregate planning approach, the processing time needed decreased while satisfying the demands.
Front Matter Jurnal Ilmiah Teknologi dan Rekayasa Vol. 29 No 3, Desember 2024 Jurnal Ilmiah Teknologi dan Rekayasa, Editorial
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

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

Abstract

PENINGKATAN EFISIENSI MANUFAKTUR RING INJECT CAVITY MOULD DENGAN PENGGUNAAN FIXTURE PADA MESIN CNC MILLING DI PT. BIL Hartman, Bemly; Izzat, Albait Malikul; Nursalam, Rachmat; Heryana, Ghany
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.11211

Abstract

Ring inject cavity mould is a crucial component in the injection stretch blow process used in plastic bottle manufacturing machines. This process involves five main steps: injection, conditioning, stretching, blowing, and ejecting. However, damage to the ring inject cavity mould is a common occurrence, necessitating periodic component replacement. The objective of this research is to identify a more efficient production method for manufacturing ring inject cavity moulds at PT BIL. Currently, the manufacturing process is carried out using a conventional lathe, which requires 64 hours to produce 16 pieces in a single work order. This research aims to evaluate the effectiveness of using a CNC (Computer Numerical Control) milling machine as a more efficient alternative. The methodology employed involves comparing the production time between the conventional lathe and CNC milling, as well as implementing a fixture as an auxiliary tool in the CNC milling process. The data collected includes production time and product quality. The research results indicate that the use of CNC Milling significantly reduces production time to only 24 hours for 16 rings in a single work order, compared to the 64 hours required by the conventional lathe. Additionally, the quality of the products produced also meets the expected standards. The conclusion of this research is that the transition from a conventional lathe to CNC milling with the use of a fixture can improve the production efficiency of ring inject cavity moulds at PT BIL, with faster production time and maintained quality.
UPAYA PENINGKATAN KUALITAS DAN EFISIENSI PROSES PRODUKSI MEKANIS KURSI KANTOR DENGAN METODE LEAN SIX SIGMA DI PT. NUSAMULTI CENTRALESTARI Lestari, Anggi; Hasanah, Ina Siti
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.12295

Abstract

The office chair mechanism is a tool used to adjust the height, backrest tilt, and armrest position of an office chair. PT. Nusamulti Centralestari faces issues of waste, low efficiency, and high defect rates. This research aims to identify types of defects and priority waste, calculate the sigma value, propose quality improvement suggestions, and evaluate the results using the DMAIC lean six sigma method. The research results indicate three priority types of defects: bubble painting (47.95%), slag welding (18.12%), and lumpy printing (14.03%). The types of waste include defects (average score of 4.4), inventory (average score of 4.2), and overprocessing (average score of 4.0). The sigma level before quality improvement was 3.3701 with Defect per Million Opportunities (DPMO) of 30,731.2696, and the production process efficiency was 72.55%. Proposed improvements for the bubbling paint defect include doing briefings and toolbox meetings regularly, enhancing process supervision, scheduling regular equipment maintenance, storing paint in a clean area, and scheduling room cleaning. Proposed improvements for slag welding and lumpy printing defects include doing briefings and toolbox meetings regularly, enhancing process supervision, and scheduling regular machine maintenance. Inventory waste is addressed by improving supervision and quality control and revising the SOP with simpler language. Over-processing waste is addressed by improving quality control and eliminating non-value-added (NVA) activities. After implementing lean Six Sigma, the sigma level increased to 3.5060 with a DPMO of 22427.4406, and the process efficiency increased to 74.09%.
PROTOTIPE MONITORING KETINGGIAN AIR DAN KONTROL JARAK JAUH PINTU AIR PADA BENDUNGAN Ramadhani, Tarisa Auliya; Gunawan, Putri Miya; Fitriani, Lely Mustikasari Mahardhika; Yusuf, Arief Rahman
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.11849

Abstract

In an effort to enhance the efficiency and accuracy of dam monitoring, there is a need for more advanced systems compared to the manual methods still widely used. This study aims to design and develop a prototype system for monitoring water levels and controlling dam gates that can be operated automatically and in real-time. The methods used include ultrasonic sensors and water level float switches connected to an ESP-8266 microcontroller, as well as DC motors and relays to operate the dam gates. The data collected by the sensors is transmitted via the internet for remote monitoring. The results of the study show that the developed system can monitor water levels with 96% accuracy and 4% error, and provides a quick response to changes in water conditions. This system can also send real-time notifications through a web application, helping to reduce human workload and increase community preparedness around the dam area for potential flooding.
OPTIMIZING WASTE MANAGEMENT STRATEGIES FOR SUSTAINABLE CONSTRUCTION: ASSESSING THE IMPLEMENTATION OF CIRCULAR ECONOMY PRINCIPLES IN NIGERIA Unegbu, Hyginus Chidiebere Onyekachi; YAWAS, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.12837

Abstract

This study investigates waste management practices in Nigeria’s construction industry, with a focus on evaluating the adoption of circular economy (CE) principles. Using a mixed-methods approach, including structured surveys and semi-structured interviews with key stakeholders, the research highlights significant barriers to CE implementation. The findings reveal that while awareness of CE principles is moderately high, actual adoption remains limited due to financial constraints, weak regulatory enforcement, inadequate technical expertise, and insufficient infrastructure. The industry primarily relies on unsustainable waste disposal methods such as landfilling and open dumping, with limited recycling and material reuse. The study identifies opportunities for improving waste management through government-led financial incentives, regulatory reforms, capacity-building programs, and investment in recycling infrastructure. Furthermore, the adoption of digital tools like Building Information Modeling (BIM) and strategies such as modular construction are highlighted as promising approaches to reducing waste and enhancing resource efficiency. The research concludes with recommendations for a collaborative effort between government, industry, and educational institutions to drive the adoption of CE practices. Implementing these strategies could lead to significant environmental, economic, and social benefits for Nigeria’s construction industry.
ALGORITMA GREEDY COLORING PADA WEBSITE ENSIKLOPEDIA PETA Nugroho, Ibnu Aldi; Fauziah, Fauziah; Hayati, Nur
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.7899

Abstract

Graph coloring is used, because the results of graph coloring can be used in several systems, such as the scheduling and the coloring of map areas in this study. The goal in implementing graph coloring here is to get as few colors as possible in the 44 borders of villages in Jakarta Pusat. The problem of coloring graphs on the Jakarta Pusat’s villages map uses a greedy algorithm that exists on web-based maps and makes encyclopedias to support descriptions of areas that have been colored. The greedy algorithm is a form of algorithm that is currently developing in optimization problems by forming a step-by-step solution. Greedy algorithm can be applied to resolve the problem of graph coloring. The best solution to answer a graph coloring problem is to determine the chromatic number ????(????) using the greedy algorithm. Graph coloring on a map is done using a greedy algorithm to obtain the minimum number of colors possible without adjacent regions using the same color. Based on the research results, the least number of colors used in coloring the village map in Central Jakarta, which consists of 44 areas, is 6 types of colors.

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