Timotius Witono
Universitas Kristen Maranatha

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Perancangan dan Evaluasi Usability Aplikasi Pengelolaan Laboratorium Komputer Wenny Franciska Senjaya; Timotius Witono; Najib Alkhala
Journal of Information Systems Engineering and Business Intelligence Vol. 3 No. 2 (2017): October
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (594.072 KB) | DOI: 10.20473/jisebi.3.2.101-106

Abstract

Abstrak— Aplikasi pengelolaan laboratorium komputer dirancang dan diterapkan sebagai studi kasus pengukuran evaluasi tingkat kegunaan, dengan tujuan akhir sebagai peningkatan layanan dari laboratorium. Aplikasi dirancang untuk dapat mengakomodasi tiga tingkatan pengguna dengan memiliki empat fitur utama, yaitu: chatting, internet connection, service request serta information. Hasil rancangan dan implementasi aplikasi telah dievaluasi dengan menggunakan standar ISO 9241-11 untuk mengukur tingkat kegunaan (usability) terhadap pengguna, tiga faktor yang terlibat dalam pengukuran adalah efektivitas, efisiensi, serta kepuasan. Pengukuran tingkat kegunaan penting untuk menentukan tingkat penerimaan pengguna terhadap aplikasi dan sekaligus sebagai sarana pengumpulan masukan untuk penyempurnaan aplikasi bagi pengembang. Hasil evaluasi untuk tingkat efektivitas menunjukkan angka keberhasilan yang tinggi terhadap penggunaan aplikasi, yaitu 90-100%. Sedangkan hasil pengukuran efisiensi menunjukkan waktu penggunaan fitur yang masih belum merata, ada sebagian fitur yang masih belum intuitif sehingga membutuhkan waktu yang cukup panjang bagi pengguna untuk mengoperasikan sebuah fitur, dengan waktu terlama 20 detik. Sejalan dengan hasil evaluasi efektivitas yang tinggi, pengukuran tingkat kepuasan pengguna juga menghasilkan contribution score yang signifikan di angka 88,75, sehingga dapat ditarik simpulan bahwa pengguna hanya memiliki sedikit ketidaknyamanan pada aplikasi dan relatif memberikan penilaian positif pada implementasi aplikasi.Kata Kunci—Evaluasi usability, Perancangan Perangkat Lunak, Standar ISO 9241-11, User ExperienceAbstract— A laboratory management application has been designed and implemented as a case study for usability evaluation of the application, with the final aim is to increase the service level of the laboratory. The application is designed to accommodate three different users with their own specific roles and also has four main features, that are: chatting, internet connection, service request, and information. The result of the application’s design and implementation have been evaluated using ISO 9241-11 standard to measure the effectivity, efficiency, and satisfaction. The measurement of usability level is important for determining the users’ acceptance level of application and also as a feedback mechanism for the benefit of application improvement by the developer. Evaluation results for effectivity level show a high success rate of the application usage, as big as 90-100%. While the efficiency measurement results show the time of use of application’s features that are still not evenly distributed, there are several features that are not quite intuitive and require a long time for users to accomplish some particular tasks, with the longest time is 20 seconds. In line with the high result of effectivity, measurement of users satisfaction also show a significant contribution score at 88,75, so it can be concluded that users only have minor inconvenience against the application and tend to have a positive rating to the application.Keywords— ISO 9241-11 Standard, Software Design, Usability Evaluation, User Experience  
ANALISIS ALGORITMA ROUND ROBIN, LEAST CONNECTION, DAN RATIO PADA LOAD BALANCING MENGGUNAKAN OPNET MODELER Husain Nasser; Timotius Witono
Jurnal Informatika Vol 12, No 1 (2016): Jurnal Teknologi Komputer dan Informatika
Publisher : Universitas Kristen Duta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (319.486 KB) | DOI: 10.21460/inf.2016.121.455

Abstract

Load balancing is a technique to distribute traffic load into two or more lanes to reach balanced connection, optimized traffic performance, maximized data throughput, minimized delay, and avoiding data overload. Load balancing in a computer network used to modulate the balance of bandwidth usage between multiple internet service provider. This research contains Load Balancing performance test on HTTP, FTP, and VoIP. Testing application used is OPNET Modeler 14.5 simulator, and load balancing algorithm which being tested is Least Connection, Round Robin, and Ratio. The test results shows generally Ratio is better than Least Connection and Round Robin. Ratio excels on handling End-to-End Delay and Jitter in VoIP,  while Least Conncetion shows the highest throughput value in all test cases.
The Art of Internet Mapping: A Comprehensive Guide to Regional Internet Topology Mapping at the Autonomous System Level Witono, Timotius; Yazid, Setiadi; Sucahyo, Yudho Giri
Journal of Information Systems Engineering and Business Intelligence Vol. 10 No. 2 (2024): June
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jisebi.10.2.191-205

Abstract

Background: Internet topology is studied more by researchers on global internet coverage compared to limited regional coverage. However, some studies also see the importance of studying internet topology in certain countries or regions. The internet performance of a country or region can be influenced by the structure of its internet topology, and research on internet topology can contribute to improving internet topology in that region. Objective: This research initially carried out internet topology mapping in a limited region, then used experience from each step in conducting internet topology mapping to create a comprehensive guide on procedures for internet topology mapping at the autonomous system (AS) level in certain regional areas. Methods: Internet topology mapping is carried out by inferring relationships between ASes through an inference process against border gateway protocol (BGP) table dumps, while the internet topology mapping method chosen is passive mapping. Results: The entire series of steps involved in the regional internet topology mapping process have been successfully outlined in a detailed guide as a result of this research. Evaluation of the research results was carried out by implementing the application of this comprehensive guide and also through assessments from experts in related fields regarding the results of this research. The results of both evaluations showed that the research results were appropriate. Conclusion: This research provides a comprehensive guide for mapping internet topology in specific regional areas, consisting of nine sequential steps grouped into four major steps. This guide can be used to assist similar research efforts in other regional areas as well as provide further knowledge regarding studies in this field. This research is different from previous studies, because it provides a comprehensive guide to the internet topology mapping process, which has not been available in previous studies.   Keywords: Internet Topology Mapping, Regional Internet Topology, Autonomous System, Border Gateway Protocol