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Justinus Andjarwirawan
Program Studi Informatika
Computer Science & IT

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Aplikasi Toko Online Dengan Chatbox Pada Toko KCA Kevin Christian; Justinus Andjarwirawan; Alexander Setiawan
Jurnal Infra Vol 8, No 1 (2020)
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Abstract

Along with the development of technology, many people are selling online. Many people who sell online in the marketplace or have a personal website to sell. But often the problem faced by sellers and consumers is ineffective communication because the media to communicate is only limited to one or two media so that consumers often become disappointed because they are waiting for a long response. To overcome this problem, an online store application is created that can make sellers and buyers communicate with several kinds of media to communicate. The feature is that the seller can receive and send messages to the seller through several social media options available, for example Whatsapp. And in order to maintain the security of buyers when transacting websites using payment gateway services from Midtrans that provide payment methods including card payments, bank transfers, direct debit, e-wallet, over the counter, and others.The end result of making this program is an online store application, which has communication features via email to social media. The conclusion obtained from making this program is that the program is feasible to use, and the store application communication features and payment can run well.
E-Vote Menggunakan RFID Sebagai Login Key Untuk Pemilihan Ketua Organisasi Universitas Kristen Petra Berbasis Web Daniswara Kusuma Aji; Justinus Andjarwirawan; Alexander Setiawan
Jurnal Infra Vol 7, No 2 (2019)
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Abstract

Voting or more commonly called voting is one method that is used by humans to make choices, decisions in a matter. In Indonesia alone voting is often used in the election of leaders such as the president, student council president and at the head of the organization. In the election in Petra itself there were many problems such as ballot paper folds for voting, long time duration on vote preparation and vote counting. In this case, the most affected by this problem is the election committee because it takes a long time and preparations with a lot of labor needs have not been added to by human error which can cause loss to many parties. It can be concluded that the problem is how to vote by using paper that is efficient and does not take a long time and how everyone only makes one vote once.To answer this problem, an electronic voting system was designed using rfid and also website-based thermal printer and barcode technology. By using this technology, each voter will get a receiptthat will be entered into the ballot box so that it can be re-audited if needed. In addition, this resolves the problem of inefficient paper use and reduces the burden on the election committee. voting must be regisified first and will be checked whether the voter has voted or not.
Pengembangan Aplikasi DVR Driving dengan Fitur Remote Live Streaming dan Speedometer Berbasis Android Nico Gufron; Justinus Andjarwirawan; Agustinus Noertjahyana
Jurnal Infra Vol 9, No 1 (2021)
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Abstract

On this era, motor vehicles already help people on daily basis, helping people to deliver goods, or transporting people. But on the way, there is a disaster waiting, either accidents on other vehicles or other accidents. Therefore, in this thesis will develop an application for DVR based on Android, equipped with additional features, such as GPS, Speedometer, and Live Streaming. In this application, users are able to record and take pictures with location and description about the videos and photos they take. Furthermore, live streaming feature added to help other users to join live streaming just entering channel name. Live streaming library helped by Agora Video Broadcasting library. The tests were carried out by adding applications to different smartphone devices 
Implementasi Algoritma AES, ElGamal, dan SHA3 untuk Keamanan File Digital Joshua Allan Saputra; Justinus Andjarwirawan; Lily Puspa Dewi
Jurnal Infra Vol 9, No 2 (2021)
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Abstract

In this modern era, technological developments in the world are developing very quickly. This very rapid technological advancement makes work and exchange of data and information very fast, accurate, and efficient. But with this convenience, new security gaps have also emerged, such as the emergence of crimes in cyberspace (cyber-crime). These actions can be in the form of data theft, breaking someone's password, to distributing software or someone's data without permission. Therefore, this study aims to overcome these security problems by implementing the AES algorithm, ElGamal algorithm, and SHA3 hash function so that they can be used simultaneously to become a secure and solid encryption system.The testing in this study is divided into three stages, namely testing the system's ability to perform the encryption and decryption process, testing the system speed, and testing the web platform. From the test results, it can be proven that the program can encrypt and decrypt all types of files properly and can detect the authenticity of the file. In web testing, it can be seen that the web is able to send encrypted files to recipients properly without missing anything.This research produces a software that can perform encryption and decryption of various types of files and can verify if there are changes / modifications to the file. This research also produces a web platform that can be used to send files between users correctly.From the test results, the program can encrypt files with an average speed of 999.43 bytes/ms and decrypt files with an average speed of 450.38 bytes/ms.
Analisis Perbandingan Kinerja Algoritma Load Balancer NGINX pada Studi Kasus PRS William Chen; Agustinus Noertjahyana; Justinus Andjarwirawan
Jurnal Infra Vol 7, No 2 (2019)
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Abstract

The development of technology will certainly create new problems, where more client activity will be available to access existing servers. One example is the activity of registering an online study plan at Petra Christian University. Where most students log in simultaneously into the PRS system which results in full access to the server.This study will conduct a trial with the implementation of a container using a docker. Containerization technology is a very effective way to run an application. Where with containerization, it will set the entrance from the client to the server via the docker assistance and with some of the algorithms it has, namely Round Robin, hashes and Least Connection.With the tests carried out it can find the algorithm of the NGINX load balancer which is the most effective and efficient when distributing workload to the web service available in the online PRS case study. So that the PRS process going forward using existing algorithms becomes more effective and efficient.
Pengaruh Sampling Method dan Feature Extraction untuk Meningkatkan Detection Rate pada Minority Class pada Intrusion Detection System yang Disusun dari Support Vector Machine, Decision Tree, dan Naïve Bayes Janthake Decuellar; Henry Novianus Palit; Justinus Andjarwirawan
Jurnal Infra Vol 9, No 2 (2021)
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Intrusion detection system (IDS) has started to rely on machine learning to perform misuse detection or anomaly detection. As misuse detection, machine learning must be able to detect various types of intrusions, including those that are rare. However, machine learning has weaknesses, especially when faced with imbalanced datasets. Various methods are used to make machine learning able to perform the classification correctly even though the data provided is imbalanced. One of them in this study tries to implement Principal Component Analysis as feature extraction, Tomek Links as under-sampling and ADASYN as over-sampling on datasets. There are two types of datasets used in this research, namely KDD-99 and UNSW-NB15.The results obtained from research on the KDD’99 dataset are, Support Vector Machine can identify more intrusions than before and True Positive Rate of Decision Tree model for minority classes is increased between 0.03% to 4.762%. The results obtained from research on UNSW-NB15 dataset, accuracies for Support Vector Machine and Naïve Bayes models are increased between 0.045% to 1.513%.
Aplikasi untuk Monitoring Jaringan IoT Menggunakan Algoritma Address Shuffling dengan HMAC Elvan Alandi; Agustinus Noertjahyana; Justinus Andjarwirawan
Jurnal Infra Vol 8, No 2 (2020)
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Abstract

With the increasing market of the Internet of Things and Wireless Sensor Network (WSN). Increasing network security on the Internet of Things is important. Internet of Things is used starting from smart homes, smart campuses, smart cities, etc. so securing the Internet of Things network is more important than securing ordinary local networks. In addition, IoT devices have weaknesses in computing capabilities and storing sensitive data. There are four main types of weaknesses in the network, namely address spoofing attacks, false address conflicts, address exhaustion attacks and negative reply attacks.The method used is Address shuffling with HMAC. This method is run by the DHCPv6 server (Dynamic Host Configuration Protocol) as a network coordinator and is monitored by the Android application to secure the Internet of Things network. DHCPv6 server is used on the Internet of Things network because it is faster and easier to control through the server, can be used on large networks and stop and restart commands can be done on the server. Additionally, when a DHCPv6 server has a problem, this will not interrupt other devices on one network.The result of this program is a monitoring application that is able to notify users of attacks and the network is able to minimize four weaknesses in the network. So that later this application can help users to take preventive actions against attacks on the network.
Penerapan QRCode Untuk Presensi Mata Kuliah Mahasiswa Dengan Yii Framework Kristian Suryajaya The; Djoni Haryadi Setiabudi; Justinus Andjarwirawan
Jurnal Infra Vol 8, No 1 (2020)
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Abstract

In this Presence activity it is still done manually and still uses paper for the Presence system, and there are still many cheats in the Presence process. There are several studies that have used the Yii Framework for the Presence system but in that study it was still less successful in overcoming the problem well and the lack of features that prevented fraud in the presence. This research was made by conducting a literature study on previous research studies aimed at learning in the framework and learning about the presence system, then an analysis of the old system, problem analysis and needs analysis will be made and a website for the presence system with QRCode using the framework yii , and the system will be tested whether the system is suitable for use. The results obtained from this application are students can attend online using QRCode and check according to the location of the student and the time at the time of attendance.
Sistem Kontrol dan Monitoring Ph Air serta Kepekatan Nutrisi pada Budidaya Hidroponik Jenis Sayur dengan Teknik Deep Flow Techcnique Moses Gregoryan Ndolu Eoh; Justinus Andjarwirawan; Resmana Lim
Jurnal Infra Vol 7, No 2 (2019)
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Abstract

The development of information technology is increasingly advanced and fast. Many technologies go into other fields such as agriculture. The most frequently used technology is IoT. All forms of IoT Technology will relate to the internet. This technology can facilitate people in the field of agriculture such as making hydroponic nutrients automatically with the website application. Obviously this technology requires microcontroller tools, sensors and other robotic tools.To connect with censorship tools and website applications, microcontrollers are required as a control center. Creating a website application using the PHP programming language. As for microcontrollers use the C++ programming language. On the website will be displayed data in graphic form. The process of sending sensor data to a website via a local server. The microcontroller used is Wemos D1R1 which has a wifi module.The result of this research is the microcontroller managed to run well with the website application. PH control and monitoring system, the concentration and volume of water running according to the setpoint specified by user. User Interface which is simple and easy to understand.
Analisa Kinerja Apache dan Nginx dalam Arsitektur Microservice Menggunakan Siege Howard Christopher Yoel Unsong; Justinus Andjarwirawan
Jurnal Infra Vol 9, No 2 (2021)
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From the existing problem, there is how to make sure that an API with an internal network will not slow down the response time overall and how to use load balancer results without scalability. This thesis aims to solve this problem by analyzing the performance of the web service on the microservice architecture between apache and nginx by using siege on IP version 4. The method used is qualitative, which distinguishes it from other studies, this study uses a microservice architecture and uses siege as a tool to run scenarios that are tested. The result is that the apache web server works better than the nginx web server in response time and throughput, but the nginx web server hits transactions more than apache . The conclusion is in accordance with the emphasis in the problem formulation, so that the performance of the apache web server is better.
Co-Authors Agustinus Noertjahyana Agustinus Noertjahyana Alexander Setiawan Aligia Ricky Agusta Alvin Nathaniel Tjondrowiguno Andreas Handojo Andreas Wijaya Kangnata Antonius Wibisono Billy Gracia Bobby Irawan Bryant Plaudo Santoso Christian Khontoro Daniel Valentino Hidayat Daniswara Kusuma Aji Djoni Haryadi Setiabudi Elvan Alandi Fernando Febrianto Henry Novianus Palit Howard Christopher Yoel Unsong Igor Maha Putra Indar Sugiarto Janthake Decuellar Jemima Ciani Setiawan Joshua Allan Saputra Kevin Christian Kevin Kevin Kristian Suryajaya The Lauw Hermawan Pratama Lauwoto Leo Willyanto Santoso Lettisia Apriolita Harjono Lily Puspa Dewi Marvil Dondokambey Maximillian Christianto Michael Anggreawan Alexander Moses Gregoryan Ndolu Eoh Nico Gufron Nirwan Jaya Suwarno Resmana Lim Resmana Lim Ricky Kuncoro Rolly Intan Rudy Adipranata Silvia Rostianingsih Stephen Lukas Wijaya Vania Putri Minarso William Chen Yulia Yulia