JURNAL JUMATIKO

Analisis Efektifitas Sistem kasir berbasis PHP untuk Meningkatkan Efesiensi Penjualan Kerupuk Yuyoyun

Yogi Agasi Saputra — 2026-07-16

This study aims to analyze the effectiveness of a PHP-based cashier system in improving sales efficiency at Kerupuk Yuyoyun. Previously, the sales recording process was performed manually, which often led to errors and delays in generating reports. To overcome these issues, a computerized cashier system was developed using PHP and MySQL to manage product data, categories, and sales transactions more accurately. The system was tested using the black box testing method, and the results indicate that all system features function properly. The system successfully accelerates transaction processing, increases the accuracy of sales recording, and automatically produces structured sales reports. The findings demonstrate that the PHP-based cashier system is effective in enhancing sales efficiency at Kerupuk Yuyoyun.

Penerapan Algoritma C4.5 untuk Memprediksi Status Penjualan Laptop dan PC pada Toko Elektronik

Nurul Hikmah — 2026-07-16

This study aims to apply the C4.5 algorithm to predict the sales status of laptops and PCs in electronics stores to support decision-making in stock management and web-based marketing strategies. The problem faced is the unavailability of a web-based prediction system capable of accurately classifying products into best-selling and non-best-selling categories based on certain attributes. The method used is a data mining technique with a classification approach using the C4.5 algorithm implemented in a web-based system. The research stages include collecting sales data, determining attributes consisting of product type, brand, and price, and forming a decision tree based on the calculation of gain values to generate classification rules. The results show that the product type attribute is the dominant factor in determining sales status. Based on the resulting decision tree, the rule obtained is that products with the PC type are categorized as best-selling, while products with certain types of laptops and brands are categorized as not best-selling, laptops with other specific brands are categorized as best-selling, and laptops with price categories B or C are categorized as not best-selling. The web-based system developed is capable of displaying prediction results quickly and easily understood, so it can be used as a basis for decision-making in electronics stores.

PENGEMBANGAN SISTEM PENJUALAN IKAN ASIN BERBASIS JAVA DI TOKO USAHA PONCAN

Abnan Khaisar Pasaribu — 2026-07-24

The development of information technology plays a significant role in increasing the efficiency of data processing in various business sectors, including sales. Poncan's Shop in Sibolga City is a business specializing in the sale of salted fish. The process of recording sales transactions, purchases, and managing inventory at the shop is still done manually, often leading to recording errors, delays in reporting, and ineffective data management. This study aims to design and build a desktop-based salted fish sales information system using the Java programming language with the help of NetBeans and a MySQL database. The methods used in this study include analysis of the existing system, system design using UML (Use Case Diagrams, Activity Diagrams, Sequence Diagrams, and Class Diagrams), and system testing using Black Box Testing. The results of this study are an information system application capable of managing product data and sales transactions, and generating reports quickly and accurately, thereby improving work efficiency at Poncan's Shop.

IMPLEMENTASI ALGORITMA CAESAR CIPHER UNTUK PENGAMANAN PESAN TEKS

Nenni Parida — 2026-07-24

This study aims to implement the Caesar Cipher algorithm for securing text messages. The background of this research is the increasing need for information security in digital communication, particularly to protect data from unauthorized access. The method used is the design and development of a system based on the Java programming language that performs encryption and decryption processes using character shifting techniques. The results show that the developed system is capable of converting plaintext into ciphertext and restoring it to its original form based on the given key. System testing indicates that the Caesar Cipher algorithm can be used as a simple method for securing text messages, although it has limitations in terms of security strength. This study is expected to serve as a learning medium for understanding the basic concepts of cryptography.