Publikasi Universitas Mercu Buana
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Sistem Enkripsi Dokumen Digital Melalui Kombinasi AES-128 dan Hashing SHA-256 Berbasis Salt
No full textPengelolaan dokumen digital menuntut sistem keamanan yang andal untuk mencegah akses tidak sah dan menjaga kerahasiaan informasi. Penelitian ini merancang dan mengimplementasikan sistem pengamanan dokumen berbasis web dengan mengombinasikan algoritma enkripsi simetris Advanced Encryption Standard (AES-128) dan hashing SHA-256 berbasis salt. AES-128 digunakan untuk mengenkripsi isi dokumen agar tidak dapat diakses oleh pihak yang tidak berwenang, sedangkan SHA-256 dengan salt digunakan untuk memperkuat autentikasi pengguna dan mencegah serangan berbasis rainbow table. Sistem dikembangkan menggunakan bahasa pemrograman PHP dengan basis data MySQL dan terdiri dari dua modul utama: enkripsi file dan autentikasi pengguna. Pengujian dilakukan secara fungsional dan performa terhadap 10 file uji dengan format berbeda, serta simulasi dictionary attack untuk mengukur ketahanan sistem terhadap serangan kamus. Hasil menunjukkan bahwa seluruh fitur utama berjalan dengan baik, proses enkripsi rata-rata 135 ms dan dekripsi di bawah 150 ms, serta autentikasi berhasil menolak seluruh login tidak sah. Skema penyimpanan password dalam format salt:hash menghasilkan hash yang unik dan aman. Batasan sistem ini adalah belum tersedianya fitur reset password enkripsi dan belum diuji terhadap serangan lanjutan seperti SQL injection atau side-channel attack. Integrasi dua metode kriptografi ini memberikan perlindungan berlapis terhadap dokumen digital serta meningkatkan keandalan sistem autentikasi. Antarmuka yang ramah pengguna menjadikan sistem ini relevan untuk diimplementasikan pada institusi yang membutuhkan tingkat keamanan data tinggi
Klasifikasi Penyakit Kardiovaskular Menggunakan Algoritma Decision Tree C4.5
No full textBerdasarkan data yang diperoleh dari Kemenkes RI, kardiovaskular merupakan salah satu penyebab kematian tertinggi di Indonesia. Teknik Data Mining telah digunakan dalam beberapa penelitian di bidang akademik. Penelitian ini bertujuan untuk mengkategorikan penyakit kardiovaskular dan menganalisis hasil akurasi dari algoritman decision tree C4.5. Dataset penyakit kardiovaskular yang digunakan terdiri atas 2 kategori yaitu ada atau tidaknya penyakit kardiovaskular. Setelah data terkumpul, dilakukan preprocessing. Tahapan selanjutnya yaitu memisahkan data training dan data testing. Adapun algoritma yang digunakan untuk klasifikasi adalah decision tree. Setelah itu akan dilakukan evaluasi terhadap hasil klasifikasi untuk mendapatkan nilai akurasi, dan hasil tersebut akan dianalisis untuk menentukan kelayakan model klasifikasi. Berdasarkan hasil penelitian, algoritma decision tree dapat mengklasifikasi penyakit kardiovaskular dengan baik dan memperoleh akurasi tertinggi sebesar 63,62% pada kombinasi data testing dan training sebasar 70:30
Analysis of The Effect of Temperature Variations and Natural Gas Flow on Zinc Oxide (Zno) Quality Results Using The French Method
No full textThis study aims to analyze the effect of temperature and gas flow variations on the quality of Zinc Oxide (ZnO) produced in terms of particle size and product purity using the French method. The French method is a standard production technique used to manufacture ZnO, which utilizes the oxidation of zinc metal at high temperatures. The problem in the ZnO manufacturing process is determining what natural gas temperature and flow will be used to obtain the best quality, considering fuel consumption and production efficiency. In this study, temperature variations of 900°C, 1000°C, and 1100°C and natural gas flow using CNG (Compressed Natural Gas) with variations of 50 m3/hour, 55m3/hour, 60m3/hour were applied to understand how these parameters affect the properties of the resulting ZnO, characterization of the results was carried out using the complexometric titration method with ethylenediaminetetraacetic acid (EDTA) solution to determine the purity of the resulting ZnO and using a laser diffraction instrument to examine the size of ZnO particles. The results showed that the process temperature significantly affected the purity of ZnO. At a temperature of 1100 °C, the purity of ZnO reached 99.94%, which is the testing value in this study. At a gas flow of 60 m3/h, the purity of ZnO tends to be stable at a value of 99.93–99.94%. Meanwhile, the results of particle measurements at a temperature of 900°C with a gas flow of 50 m3/h, D50 reached 1.235 µm. At a temperature of 1100°C with a gas flow of 60 m3/h, D50 decreased to 1.089 µm. This particle size indicates that high temperatures encourage agglomeration reduction, resulting in finer ZnO particles. This study concludes that temperature and gas flow parameters play an important role in controlling the quality of ZnO produced through the method, with oxygen gas flow at high temperatures giving optimal results
Design and Development of Flow Loss Testing Device in Pipe Installation Using VDI 2221 Method
No full textPiping installation is a medium for fluid transfer which has many design variations. The design used can affect the flow rate of the fluid. The effect comes from head losses which are divided into major losses and minor losses. Basically, major losses are losses caused by straight pipes while minor losses are losses due to pipe components. These components can be in the form of bends, connections, branching and changes in cross-sectional size. Losses that occur in pipe flow can be studied by direct simulation. To carry out a direct simulation, a test tool is needed that can help analyze losses that occur in fluid flow in pipe installations. The design that is carried out refers to the use of pipe installations that are often encountered including its components. The system design of the flow loss test equipment is selected using the VDI 2221 method. The selection of components is carried out by comparing the variations in the arrangement of system components. From the results of this comparison, the best variation was obtained with the results of the main PVC pipe, 108 bit Shimizu jet pump, ball valve type, pressure gauge capacity of 2.5 bar, flowmeter capacity of 1.5 m3/h, rotameter capacity of 2-20 GPM/10- 70 LPM. The tool has been completed built and tested so it is feasible to use.Piping installation is a medium for fluid transfer which has many design variations. The design used can affect the flow rate of the fluid. The effect comes from head losses which are divided into major losses and minor losses. Basically, major losses are losses caused by straight pipes while minor losses are losses due to pipe components. These components can be in the form of bends, connections, branching and changes in cross-sectional size. Losses that occur in pipe flow can be studied by direct simulation. To carry out a direct simulation, a test tool is needed that can help analyze losses that occur in fluid flow in pipe installations. The design that is carried out refers to the use of pipe installations that are often encountered including its components. The system design of the flow loss test equipment is selected using the VDI 2221 method. The selection of components is carried out by comparing the variations in the arrangement of system components. From the results of this comparison, the best variation was obtained with the results of the main PVC pipe, 108 bit Shimizu jet pump, ball valve type, pressure gauge capacity of 2.5 bar, flowmeter capacity of 1.5 m3/h, rotameter capacity of 2-20 GPM/10- 70 LPM. The tool has been completed built and tested so it is feasible to use
Numerical Analysis of Heat Transfer Enhancement in Wavy Trapezoidal and Rectangular Microchannels
No full textThis study presents a comprehensive numerical investigation of heat transfer enhancement in microchannels with varying geometries, specifically focusing on wavy microchannels with trapezoidal and rectangular cross-sections. Water is used as the working fluid, and silicon is selected as the solid wall material. A three-dimensional conjugate heat transfer model is developed by solving the steady-state Navier–Stokes and energy equations using the finite volume method in ANSYS Fluent, with the SIMPLEC algorithm employed for pressure–velocity coupling. The analysis examines the influence of cross-sectional shape and wall waviness on thermal performance, while maintaining a constant hydraulic diameter across all configurations. Eight different geometries, including smooth and wavy versions of rectangular and trapezoidal cross-sections with varying top-to-bottom width ratios (0.075–0.055 mm), are evaluated over a Reynolds number range corresponding to inlet velocities of 0.5–4.0 m/s. Results show that wavy microchannels significantly enhance heat transfer compared to their smooth counterparts. For instance, at 4 m/s, the Nusselt number for the wavy rectangular microchannel reaches 9.48, compared to 7.19 for the smooth rectangular configuration, representing a 32% enhancement. Similarly, the wavy trapezoidal channel with a top width of 0.18 mm achieves a maximum Nusselt number of 9.25, compared to 7.19 for its smooth equivalent, indicating a 29% improvement. Additionally, the Nu/Nu₀ versus Re plots reveal a consistent trend of increased heat transfer due to wall waviness across all geometries, with negligible influence from cross-sectional shape when hydraulic diameter is kept constant. The study demonstrates that incorporating wavy structures into microchannel designs significantly improves thermal performance with minimal increases in pressure drop, and that the effect is driven more by wall geometry than by cross-sectional shape. These findings provide valuable insights for the development of compact and efficient microchannel heat sinks for electronic cooling applications
Sistem Pendukung Keputusan Menggunakan Metode WASPAS Untuk Pemilihan Software Developer
No full textThe advancement of information technology has driven an increased demand for competent software developers aligned with project specifications, making the selection process a strategic challenge for organizations. However, manual selection is often subjective, time-consuming, and prone to errors. Therefore, this study aims to develop a Decision Support System (DSS) based on the Weighted Aggregated Sum Product Assessment (WASPAS) method. WASPAS was chosen for its ability to integrate the strengths of the Weighted Sum Model (WSM) and Weighted Product Model (WPM) to produce decisions based on criteria weights and alternative performance. The system is designed as a web-based application to provide ease of access and usability, featuring key functionalities such as data management for criteria, alternatives, and values, as well as calculation and result presentation using the WASPAS method. The case study results indicate that Mochammad Rizal (A3) is the best alternative with the highest score of 0.8904, followed by Yosua Surojo (A4) with a score of 0.8718. Tommy Pratama (A2) ranks third with a score of 0.7101, while Gigih Prayitno (A1) occupies the last position with a score of 0.6713. System testing using the black-box testing method ensures that all features function according to the designed specifications. This study contributes a systematic solution to simplify the software developer selection process while reducing subjective bias in decision-making
Quality Analysis and Improvement of Nut Dragging Defects in FR S/C Side RH Bracket Products within Indonesia's Automotive SMEs
Get PDFThis study analyses the quality of FR S/C Side RH Bracket products at PT BMI, especially concerning the nut dragging problem, which is often the main defect. This study aims to analyze and improve the nut dragging defect problem in FR S/C Side RH Bracket products, as well as provide an understanding of the effectiveness of the improvement in reducing the number of defective products. The analysis shows that FR S/C Side RH Bracket products with nut dragging problems are the most frequent defects, reaching 632 defective units or about 60% of the total defective products before improvement. The Failure Tree Analysis (FTA) method was used to identify the root cause of the nut dragging problem, which revealed that machine factors were generally the main cause, especially setting the spot welding machine parameters too high. In response, improvements were made by changing the parameters on the SW.03 spot welding machine and adding a cooling water line. The results showed a significant decrease in defective products, totaling 1320 units. After the improvement, only 141 units were defective. This research provides an in-depth understanding of product quality issues at PT BMI. It offers solutions to improve product quality and meet customer expectations in the highly competitive automotive industry
THE ROLE AND IMPACT OF INFORMATION TECHNOLOGY DEVELOPMENT ON THE STUDENT LEARNING PROCESS IN THE DIGITAL ERA
Get PDFThe rapid evolution of information technology (IT) has profoundly reshaped the educational landscape, particularly for university students. Learning processes, once confined to physical classrooms, are now accessible through diverse digital platforms with enhanced flexibility. This study aims to analyze the role and impact of IT development on the effectiveness of student learning in the digital age. Employing a literature review methodology drawing from various academic sources and scholarly articles, the findings indicate that IT plays a crucial role in facilitating information access, enhancing learning interactivity, and broadening students' intellectual horizons. Nevertheless, the advancement of IT also introduces negative consequences, such as device dependency, diminished academic focus, and the risk of information misuse. This paper explores both the advantages and the challenges, providing a comprehensive overview of IT's dual role in modern higher educatio
Financial Well-Being: Indications on Buy Now Pay Later Users in Indonesia
Get PDFBuy Now Pay Later (BNPL) is a payment method that allows consumers to purchase goods and pay for them later within a specified period. This study aims to explore the influence of financial knowledge, financial behavior, and self-control on the financial well-being of BNPL users in Indonesia, where the service is becoming increasingly popular, particularly among the younger generation. The research sample focuses on Millennials and Gen Z in Indonesia who have used BNPL services in the past six months. The analytical tool used is Partial Least Squares-Structural Equation Modeling (PLS-SEM) based on SmartPLS. The results indicate that while financial knowledge is only meaningful when mediated by financial behaviour, financial behaviour and self-control have a beneficial impact on financial well-being. These findings highlight the importance of financial education and the role of BNPL providers in offering features such as payment reminders and credit limits to support users' financial well-being
PENGARUH WORK LIFE BALANCE, MOTIVASI KERJA DAN BEBAN KERJA TERHADAP KINERJA KARYAWAN (STUDI PADA KARYAWAN DI PT. INDONESIA EPSON INDUSTRY)
Get PDF. Penelitian ini bertujuan untuk mengetahui pengaruh work life-balance, motivasi kerja dan beban kerja terhadap kinerja karyawan (studi pada PT.Indonesia Epson Industry). Penelitian ini dilakukan terhadap 151 responden dengan menggunakan pendekatan kausal kuantitatif. Pendekatan yang digunakan dalam penelitian ini adalah Structural Equation Model (SEM) dengan alat analisis Smart-PLS. Berdasarkan hasil analisa pada penelitian ini diperoleh bahwa Work-Life Balance memiliki hubungan yang positif dan signifikan terhadap Kinerja Karyawan, Motivasi Kerja berpengaruh positif dan signifikan terhadap Kinerja Karyawan di perusahaan, dan Beban Kerja memiliki hubungan negatif dan signifikan terhadap Kinerja Karyawan.