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All Journal Seminar Nasional Aplikasi Teknologi Informasi (SNATI) TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Teknologi International Journal of Applied Sciences and Smart Technologies Abdimas Altruis: Jurnal Pengabdian Kepada Masyarakat Konstelasi: Konvergensi Teknologi dan Sistem Informasi
Damar Widjaja
Universitas Sanata Dharma
Humanities Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Other

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PERBANDINGAN UNJUK KERJA PROTOKOL ROUTING AD HOC ON-DEMAND DISTANCE VECTOR (AODV) DAN DYNAMIC SOURCE ROUTING (DSR) PADA JARINGAN MANET Sidharta, Yonas; Widjaja, Damar
Jurnal Teknologi Vol 6 No 1 (2013): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Perkembangan jaringan komputer saat ini mulai bergeser dari jaringan berkabel ke jaringan nirkabel (wireless). Perkembangan ini merupakan tuntutan dari meningkatnya kebutuhan masyarakat akan akses informasi dan data secara cepat kapan saja dan di mana saja. Salah satu model dari jaringan nirkabel adalah jaringan ad hoc. Salah satu contoh jaringan ad hoc yang mengalami perkembangan sangat pesat adalah Mobile Ad Hoc Network (MANET). Penelitian ini dilakukan dengan simulasi dan analisis kinerja reactive routing protocol Ad-hoc On-demand Distance Vector (AODV) dan Dynamic Source Routing (DSR). Kinerja jaringan yang diukur adalah rata-rata throughput, delay, jiter, packet delivery ratio, packet loss, dan routing overhead pada skenario yang berbeda berdasarkan penambahan jumlah node dan jumlah koneksi. Simulasi dilakukan menggunakan Network Simulator-2 (NS-2). Hasil penelitian menunjukkan bahwa routing protocol DSR lebih baik berdasarkan parameter jaringan delay, jitter, packet delivery ratio, packet loss, dan routing overhead dibandingkan AODV untuk semua skenario. Sedangkan AODV lebih baik berdasarkan parameter jaringan throughput dibandingkan dengan DSR untuk semua skenario.
A numerical-analytical iterative method for solving an electrical oscillator equation Sudi Mungkasi; Damar Widjaja
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 4: August 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i4.18987

Abstract

Self-excited oscillation problem occurring from a triode electrical circuit has been modelled by van der Pol. Until now, the exact solution to the van der Pol equation is not available. This paper focuses on finding a new method for solving the van der Pol equation simply and accurately. There exists several approximate iterative methods available in the literature for solving the van der Pol equation, such as, the successive approximation method. The successive approximation method is simple, but inaccurate for large time values. In this paper, we propose a new variant of numerical-analytical method, which is simple but accurate, for solving the van der Pol equation. Our new variant of numerical-analytical method solves the van der Pol equation from its equivalent system of first order ordinary differential equations. Our strategy leads to a simple implementation of the numerical-analytical method in the multistage way. Furthermore, computational experiments show that our proposed method is accurate for large sizes of time domain in solving the van der Pol equation.
Akuisisi Data GPS untuk Pemantauan Jaringan GSM Dandy Firdaus; Damar Widjaja
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2009
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Pemantauan jaringan pada jaringan Global System for Mobile Communications (GSM), dilakukan untukmemantau kualitas jaringan. Pada sistem pemantauan jaringan, pemetaan kualitas jaringan pada peta digitalsangat diperlukan untuk kebutuhan analisa. Untuk menghasilkan sistem pemantauan jaringan yang akurat,handal, dan efisien, dibutuhkan sebuah perangkat lunak yang bisa melakukan akuisisi data posisi dari GPS, danmenggabungkan data posisi dengan data kualitas jaringan. Program akuisisi data GPS untuk implementasipemantauan jaringan GSM merupakan program yang bekerja untuk melakukan akuisisi data posisi GPS,menyimpan data posisi ke dalam database, menggabungkan data posisi dengan data kualitas jaringan, danmenampilkannya ke dalam titik posisi pada peta digital.Kata Kunci: akuisisi data, GPS, network monitoring, GSM
Sistem Pemantauan Identitas Jaringan GSM Dedi.S Martua Gultom; Damar Widjaja
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2009
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Jumlah pengguna yang semakin banyak bisa menjadi penyebab penurunan kualitas layanan karena adanyakemungkinan peningkatan interferensi sinyal. Hal ini membuat operator Global System for MobileCommunication (GSM) harus menjaga kinerja jaringan pada tingkat kualitas yang memuaskan pelanggan.Sistem pengawasan identitas akan membantu operator dalam menjaga kualitas jaringan. Penelitian inimemberikan solusi akan ketersediaan perangkat pengawasan identitas jaringan GSM yang lengkap danekonomis. Perangkat lunak pengawasan identitas jaringan GSM terdiri dari dua bagian utama yaitu NetworkMonitoring dan Analyzer. Network Monitoring berfungsi untuk mengakusisi data – data identitas yang terdiridari time advance (TA), TMSI, time slot (TS), IMEI, Channel Number, Channel type, MCC, MNC, ProviderName, Provider Code, LAC, Cell ID, menampilkan data – data tersebut secara real time dan menyimpannyadalam database. Analyzer berfungsi untuk melakukan load data – data identitas dari database, mengolahnyadan menampilkannya dalam tampilan yang user friendly. Program pemantauan identitas pada jaringan GSMsudah berhasil dibuat dan dapat berjalan dengan baik dan mampu menampilkan data – data yang diinginkandengan benar.Kata Kunci: network monitoring, gsm, identitas sel
Pengukuran Kualitas Sinyal pada Jaringan GSM Damar Widjaja; Joseph Anthonyus
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2009
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Jumlah pengguna yang semakin banyak bisa menjadi penyebab menurunnya kualitas layanan karenamemungkinkan peningkatan interferensi sinyal. Hal ini membuat operator Global System for MobileCommunication (GSM) harus menjaga kinerja jaringan pada tingkat kualitas yang memuaskan pelanggan.Sistem pengawasan kualitas jaringan GSM bisa mempresentasikan kualitas jaringan sebuah operator jaringanGSM. Sistem ini akan membantu operator dalam menjaga kualitas jaringan. Penelitian ini memberikan solusiakan ketersediaan perangkat pengawasan kualitas jaringan GSM yang lengkap dan ekonomis.Kata Kunci: kualitas sinyal, jaringan GSM, network monitoring, analyzer
ALAT DISPENSER HAND SANITIZER OTOMATIS UNTUK MASYARAKAT Linggo Sumarno; Wiwien Widyastuti; A. Bayu Primawan; Martanto Martanto; Iswanjono Iswanjono; Damar Widjaja; Th. Prima Ari Setiyani; B. Djoko Untoro Suwarno; Tjendro Tjendro; Petrus Setyo Prabowo
ABDIMAS ALTRUIS: Jurnal Pengabdian Kepada Masyarakat Vol 4, No 1 (2021): April 2021
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (610.533 KB) | DOI: 10.24071/aa.v4i1.3336

Abstract

The habit of cleaning hands is one of the new habits during the current COVID-19 pandemic. One way to clean hands is with a hand sanitizer. The automatic hand sanitizer dispenser can be used to clean hands, without touching a button or any part of the appliance. Community service in this paper is carried out by making a number of automatic hand sanitizer dispensers, and distributing them in a number of places, around Campus III of Sanata Dharma University, Paingan, Maguwoharjo, Yogyakarta. A number of complaints emerged from the person in charge of the distribution site for the appliance. The most common complaint is that the appliance does not function as it should. This complaint is caused by a problem with the proximity sensor used. This sensor is too affected by light intensity. To overcome this, it is necessary to explore other types of sensors that are better than proximity sensors, which are less affected by light intensity.
Transmisi Data Citra pada Sistem Komunikasi Nirkabel dengan Teknik MIMO Damar Widjaja; Yakobus Agung Purwanto
KONSTELASI: Konvergensi Teknologi dan Sistem Informasi Vol. 1 No. 2 (2021): Desember 2021
Publisher : Program Studi Sistem Informasi Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.832 KB) | DOI: 10.24002/konstelasi.v1i2.4304

Abstract

Wireless data communication systems using Multiple Input Multiple Output (MIMO) technique in its transmission system has been well developed to solve many transmission media problems. This study aims to analyse the performance of MIMO 2x2 and MIMO 4x4 using image data. Encoding technique that is used in this study is Space Time Block Coding (STBC) by Alamouti. The result of this study shows that wireless communication system using MIMO technique is able to recover the image data on the receiver side the same as the image data on the transmitter side when SNR = 6.5dB for MIMO 2x2 and SNR = 4.5dB for MIMO 4x4.
Mini Solar Power Resources for IoT system in the Vannamei Shrimp Pond Model Widjaja, Damar; Seli Laka, Yohanes Priyanto
International Journal of Applied Sciences and Smart Technologies Volume 07, Issue 2, December 2025
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v7i2.10452

Abstract

Shrimp pond water quality is one of the challenging issues for shrimp farmer to keep or even increase their production level to meet the domestic and export needs. Many researches have been done to help shrimp farmer to manage water quality using Internet of Things (IoT) technologies. In order to make all the devices in the IoT system work properly, it needs an adequate power supply. Mini solar power plant installation is an alternative way to give shrimp farmers an electricity power access when their area has no electricity power network. In this study, we propose the use of mini solar power plants to supply the power to IoT devices in shrimp pond model. There are two main sub-system in this model, i.e. power supply sub-system and IoT based monitoring and controlling sub-system. Power supply sub-system consist of solar panel, solar cell controller, battery, INA219 sensor, and LM2596 step down IC. IoT sub-system perform monitoring and controlling on two shrimp pond models with Arduino Mega microcontroller works as the main processor. The mini solar power system works well as it was designed. Mini solar power plant capable of charging the 12V 40Ah battery in 5 hours. In order to make the IoT system works, it only needs 75,6 Wh from 480Wh battery capacity.
Co-Authors Dandy Firdaus Dedi.S Martua Gultom Djoko Untoro Suwarno Iswanjono Iswanjono Iswanjono Iswanjono Joseph Anthonyus Linggo Sumarno Martanto . Martanto Martanto Petrus Setyo Prabowo Primawan, A.Bayu Seli Laka, Yohanes Priyanto Setiyani, Th. Prima Ari Theresia Prima Ari Setiyani Tjendro Wiwien Widyastuti Yakobus Agung Purwanto Yonas Sidharta