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Scientific Journal of Informatics
Published by Universitas Negeri Semarang
ISSN : 24077658     EISSN : 24600040     DOI : -
Core Subject : Science,
Computer Science & IT
Scientific Journal of Informatics published by the Department of Computer Science, Semarang State University, a scientific journal of Information Systems and Information Technology which includes scholarly writings on pure research and applied research in the field of information systems and information technology as well as a review-general review of the development of the theory, methods, and related applied sciences.
Arjuna Subject : -
Articles 564 Documents
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Real-Time Monitoring: Development of Low Power Fire Detection System for Dense Residential Housing Based on Internet of Things (IoT) and Cloud Messenger Muhendra, Rifki; Amin, Aisyah
Scientific Journal of Informatics Vol 8, No 2 (2021): November 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v8i2.30811

Abstract

Purpose: This paper reports on the development of a low-power fire potential monitoring system for densely populated housing based on IoT Study design: This system consists of sensors integrated with a microcontroller and a Wi-Fi module that can provide data in real-time and can be accessed remotely. In addition, this system has also been simulated to analyze environmental conditions as notification data sent using cloud messenger. The grouping of potential fire hazards based on the legibility of physical parameter values is also displayed. Findings: In performance measurement, the data loss of this system is less than 1% of the total data every day. Value: It shows that this system is feasible and applied more broadly to anticipate fires in densely populated areas.
Powerpoint for Android Design Using Think Talk Write Model to Improve the Junior High School Students’ Concepts Understanding Buchori, Achmad; Cintang, Nyai
Scientific Journal of Informatics Vol 5, No 2 (2018): November 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v5i2.15357

Abstract

As the development of Science and Technology also influence the development of learning media. Media learning is one of the determinants of student learning success. Utilization of android technology so far is not only used as a means of communication, or just entertainment but now can be developed for learning media. This research aims to develop powerpoint for android with Think Talk Write model to improve understanding of SMP students concept. The research method used is Research and Development and the type of research used is ADDIE. (1) Analyze, student needs analysis shows students need learning media. (2) Design, the products produced in this study media powerpoint for android. (3) Development, media developed then validated by 84% media experts, 82% material experts, and 85% design learning experts so it is said to be valid. (4) Implementation, student responses in class VII C achievement rate 89% are in the practical category. (5) Evaluation, the data in this study consists of preliminary data in the form of values obtained through pretest and final data in the form of values obtained through posttest. The result of the second posttest of the class is tested equality of two averages (right-t test) obtained α = 0.05 obtained t_table = 1.669 and t_count = 3.251 because Since t_count t_table then H0 rejected and H1 accepted, so it can be concluded learning using Powerpoint for Android with Think Talk Write model to improve concept understanding is said to be valid, practical, and effective than the conventional learning model.
FinTech E-Commerce Payment Application User Experience Analysis during COVID-19 Pandemic Abdillah, Leon A.
Scientific Journal of Informatics Vol 7, No 2 (2020): November 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v7i2.26056

Abstract

Application of information technology in the era of big data and cloud computing has led to the trend of electronic payments through financial technology, or FinTech. One of the most popular FinTech applications in Indonesia is Go-Pay in the Gojek start-up application. This research will analyze how the FinTech Go-Pay user experience both for transactions on Gojek and at merchants that collaborate with Gojek. User Experience (UX) is analyzed using the User Experience Questionnaire which consists of 6 (six) variables (Attractiveness, Perspicuity, Efficiency, Dependability, Stimulation, and Novelty). Total data collected amounted to 258. After analyzing the calculation results, the mean scores are obtained in the following order: Efficiency, Perspicuity, Stimulation, Attractiveness, Dependability, and Novelty. Then when compared with benchmark data the following sequence is obtained: Efficiency, Perspicuity, Stimulation, Attractiveness, Dependability, and Novelty. Overall the Go-Pay service is efficient and perspicuity, but the Go-Pay service needs to improve its novelty.
Decision Support System for Supplier Selection using Analytical Hierarchy Process (AHP) Method Juliana, Juliana; Jasmir, Jasmir; Jusia, Pareza Alam
Scientific Journal of Informatics Vol 4, No 2 (2017): November 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v4i2.12015

Abstract

Technological growth is characterized by a variety of technological finds and computational methods used to facilitate human work in the era of globalization that is the method of Decision Support System (DSS) that helps decision makers to use data and models to solve problems that are not Structured. Toko Harapan Baru in making decisions in determining the best suppliers still use intuition, analysis, calculation and comparison of the manual in determining the supplier of goods to his shop takes a long time, the difficulty of searching data because there is no data processing cause is quite complicated without any particular method which gives inaccurate results. Then, Toko Harapan Baru requires a system that can be a solution to the problem that is being encountered. The Analytical Hierarchy Process (AHP) method is a functional hierarchy to help decision-makers better in making decisions on many objective issues.
Comparison Performance of Genetic Algorithm and Ant Colony Optimization in Course Scheduling Optimizing Ashari, Imam Ahmad; Muslim, Much Aziz; Alamsyah, Alamsyah
Scientific Journal of Informatics Vol 3, No 2 (2016): November 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v3i2.7911

Abstract

Scheduling problems at the university is a complex type of scheduling problems. The scheduling process should be carried out at every turn of the semester's. The core of the problem of scheduling courses at the university is that the number of components that need to be considered in making the schedule, some of the components was made up of students, lecturers, time and a room with due regard to the limits and certain conditions so that no collision in the schedule such as mashed room, mashed lecturer and others. To resolve a scheduling problem most appropriate technique used is the technique of optimization. Optimization techniques can give the best results desired. Metaheuristic algorithm is an algorithm that has a lot of ways to solve the problems to the very limit the optimal solution. In this paper, we use a genetic algorithm and ant colony optimization algorithm is an algorithm metaheuristic to solve the problem of course scheduling. The two algorithm will be tested and compared to get performance is the best. The algorithm was tested using data schedule courses of the university in Semarang. From the experimental results we conclude that the genetic algorithm has better performance than the ant colony optimization  algorithm in solving the case of course scheduling.
RETRACTED: Boyer-Moore String Matching Algorithm and SHA512 Implementation for Jpeg/exif File Fingerprint Compilation in DSA Fitriyanto, Rachmad; Yudhana, Anton; Sunardi, Sunardi
Scientific Journal of Informatics Vol 7, No 1 (2020): May 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v7i1.19059

Abstract

This paper is retracted by editor due to publication ethics missconducted by author (simultaneously publication in other journal).Similar article has appeared in http://jurnalnasional.ump.ac.id/index.php/JUITA/article/view/4413
Identifikasi Anemia Thalasemia Betha (β) Mayor Berdasarkan Morfologi Sel Darah Merah Suryani, Esti; Wiharto, Wiharto; Wahyudiani, Katarina Novi
Scientific Journal of Informatics Vol 2, No 1 (2015): May 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v2i1.4525

Abstract

Thalasemia Betha (β) Mayor merupakan salah satu kelainan sel darah merah berdasarkan klasifikasi anemia. Thalasemia Betha (β) Mayor memiliki ciri sel meliputi mikrositik, eritrosit berinti (eritroblast), sel target, dan small fragment. Thalasemia Betha (β) Mayor dianalisa berdasarkan menghitung darah lengkap pada hapusan darah dengan pemeriksaan hematologi. Namun proses tersebut menimbulkan masalah, yaitu bahwa mempengaruhi keakuratan serta membutuhkan waktu. Untuk mengatasi hal tersebut, maka proses analisa dapat dilakukan dengan menggunakan teknik pengolahan citra yang didasarkan pada bentuk morfologi sel darah merah. Artikel ini bertujuan untuk mengidentifikasi anemia Thalasemia Betha (β) Mayor berdasarkan morfologi citra sel darah merah. Metode pengolahan citra yang digunakan meliputi proses segmentasi citra berupa normalisasi citra, threshold warna, threshold Otsu, operasi morfologi erosi dan bounding box. Normalisasi dilakukan untuk menyamakan persebaran warna pada masing-masing citra sel darah yang akan digunakan. Normalisasi dilakukan dengan mengubah citra RGB menjadi YCbCr. threshold warna, threshold Otsu, operasi morfologi erosi digunakan untuk memisahkan sel dan inti sel. Ekstrasi ciri menghasilkan luas area sel, luas area inti sel, diameter sel dan rasio sel. Proses identifikasi untuk menentukan jenis sel berdasarkan hasil ekstrasi ciri. Proses pengujian menggunakan 5 kelompok gambar Thalasemia Betha (β) Mayor yang masing-masing terdiri dari 6 gambar. Hasil pengujian menunjukkan bahwa morfologi citra mampu mengidentifikasi Anemia Thalasemia Betha (β) Mayor.
Digital Management of Micro, Small and Medium Enterprises (MSME) Activities Based on the Unified Approach Astri, Renita; Faradika, Faradika; A, M. Razi; Kamal, Ahmad
Scientific Journal of Informatics Vol 8, No 2 (2021): November 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v8i2.29339

Abstract

Purpose: Micro, Small, and Medium Enterprises (MSME) is an important part of today's Indonesian economy. The times have allowed many people to do their own business. Along with the many existing businesses, many business actors are marketing for the sustainability of their business. A web-based information system that can accommodate information about Micro, Small, and Medium Enterprises management is one of the main needs for MSME actors themselves. Methods/Study design/approach: In addition, the public can use this web-based information system to obtain detailed information on MSME and MSME products through the web. Making the web using the PHP programming language where the approach taken in the design is the Unified Approach used as a method in object-based system development. Result/Findings: From the final results of this study, it can be concluded that the web-based MSME Activity Management Information System can help mass marketing of MSME players and help related agencies to find out the development of existing MSME. Novelty/Originality/Value: The website was built can help and accelerate the marketing process for existing MSMEs and can be used as a medium of communication between MSMEs and visitors.
Implementation of Expert System for Diabetes Diseases using Naïve Bayes and Certainty Factor Methods Ilham Insani, Muhammad; Alamsyah, Alamsyah; Putra, Anggyi Trisnawan
Scientific Journal of Informatics Vol 5, No 2 (2018): November 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v5i2.16143

Abstract

Expert Systems is a computer systems that has been entered the base knowledge and a set of rules used to solve problems like an expert. Methods that can be used in the expert systems which is Naïve Bayes and Certainty Factor. Naïve Bayes method can handle quantitative calculations and discreate data and only requires a little research data to estimate the parameters needed in the clasification and Certainty Factor which is suitable for measuring something whether it is certain or not in diagnosing. Diabetes is one of the most frequent diseases suffered in Indonesia. The purpose of this research is implementation expert systems used Naïve Bayes and Certainty Factor in diagnosing diabetes and knowing the level of accuracyof the systems. Data that is used by researchers as much 100 data medical record, obtained from the medical record RSUD Bendan Kota Pekalongan. The variabels used in this research is age, gender, the symptoms of the desease diabetes and result diagnose desease from expert. The accuracy rate of this system derived from the scenario distribution data 70 training data and 30 testing data that is equal to 100% according to the doctor's diagnosis.
Implementasi Kriptografi Kunci Publik dengan Algoritma RSA-CRT pada Aplikasi Instant Messaging Arief, Ashari; Saputra, Ragil
Scientific Journal of Informatics Vol 3, No 1 (2016): May 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v3i1.6115

Abstract

Instant messaging merupakan salah satu bentuk kemajuan teknologi komunikasi yang mempermudah penyampaian informasi. Saat ini, dengan semakin banyaknya pengguna aplikasi instant messaging berakibat pada dampak negatif berupa penyadapan data khususnya saat terjadi komunikasi yang bersifat rahasia. Algoritma RSA merupakan salah satu satu algoritma dalam kriptografi kunci publik. Pada proses enkripsi dan dekripsi digunakan kunci yang berbeda. Proses dekripsi algoritma RSA sering terjadi kendala karena ukuran kunci dekripsi yang relatif besar dapat memperlambat proses. Untuk mempercepat proses dekripsi, algoritma RSA dapat dimodifikasi dengan algoritma CRT (Chinese Remainder Theorem), sering disebut dengan Algoritma RSA-CRT. Implementasi algoritma kriptografi RSA-CRT pada aplikasi instant messaging pada panjang bit n mulai dari 56 bit sampai 88 bit, proses dekripsi RSA-CRT dua kali lebih cepat dibandingkan proses dekripsi RSA. 

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