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All Journal BERKALA FISIKA Media Statistika MATEMATIKA JURNAL SISTEM INFORMASI BISNIS Scientific Journal of Informatics E-Dimas: Jurnal Pengabdian kepada Masyarakat IT JOURNAL RESEARCH AND DEVELOPMENT Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal E-Komtek Dedikasi Nusantara
Ragil Saputra
Departemen Ilmu Komputer/Informatika Fakultas Sains Dan Matematika Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Arts Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Mathematics Physics Social Sciences

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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. 
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.
SISTEM AKUISIS DATA KOMPUTER PADA SENSOR ULTRASONIC RANGER UNTUK PENGUKURAN LEVEL MUKA AIR Suryono, Suryono; Surarso, Bayu; Saputra, Ragil
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.501 KB)

Abstract

This paper describes the method of ultrasound ranger development, data acquisition system and its characteristic than applied for automation water level distance measurement system using personal computer. This system is very important for recorded of water level data acquisition inlong time so data communication at measurement system.The system consist of ultrasonic distance sensor, microcontroller for time-of-flight counter and   serial interface,  and computer system fordata acquisition system. The microcontroller drive of sensor for generate of burst pulse. The 16-bitof counter of  microcontroller  was used for time-of-flight counter. Data was transmitted tocomputer twice at 8-bit of counter register. The microcontroller transmitted data at 9600 BPSusing UART protocols and slave-master for serial communication system. The communicationsystem was connected at voltage level communication RS232. The computer application of dataacquisition system was connected at COM port using Cport pellete in Borland Delphi. Thecollected data calibrated using standard.  The result of system characterization  have highmeasurement stability system at 99,61%, range of measurement distance at 10 cm to 280 cm,linear correlation with standard measurement at R = 0,9999, so it good for more application.Keywords : distance, pulse, counter, serial communication
PEMETAAN PENYAKIT DEMAM BERDARAH DENGUE DENGAN ANALISIS POLA SPASIAL DI KABUPATEN PEKALONGAN Yasin, Hasbi; Saputra, Ragil
MEDIA STATISTIKA Vol 6, No 1 (2013): Media Statistika
Publisher : Department of Statistics, Faculty of Science and Mathematics, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.845 KB) | DOI: 10.14710/medstat.6.1.27-36

Abstract

The number of dengue haemorrhagic fever (DHF) incidence in Pekalongan from year to year is very volatile. In 2006, there was 352 cases, 718 cases occurred in 2007, 2008 saw 403 cases, 2009 there were 753 cases, whereas in 2010 a decline to 223 cases. This is possible due to the lack of information about the place, time and location of the incident spread of dengue in Pekalongan. Various efforts have been made to address these issues both society and government but the incidence of this disease has not been effectively suppressed. The results of data analysis showed that the incidence of dengue in Pekalongan mostly occurs during the rainy season is the period from January to June. The DHF incidence tends to be higher in Kedungwuni. Highest incidence of DHF occurred in April 2010. In addition, there are some months that indicate the spatial relationships in the incidence of dengue in Pekalongan, ie January, February, July, October and December. The sub-district that has a positive autocorrelation is  Kedungwuni, Wonopringgo, and Tirto. While the sub-district has a negative autocorrelation is Karangdadap. Most of the sub-districts in Pekalongan status is still endemic for dengue.   Keywords: DHF, Moran’s Index, Spatial Pattern
SISTEM INFORMASI GEOGRAFIS PENCARIAN RUTE OPTIMUM OBYEK WISATA KOTA YOGYAKARTA DENGAN ALGORITMA FLOYD-WARSHALL Saputra, Ragil
MATEMATIKA Vol 14, No 1 (2011): JURNAL MATEMATIKA
Publisher : MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11.888 KB)

Abstract

The Information system based on spatial or Geographic Information System (GIS) is growing faster. GIS can be used to solve many problems, one of the solutions that GIS could address is for look optimum route base on start location and destination. By using GIS, user can get visual information. This research is implementing Floyd-Warshall algoritm for optimize route in Yogyakarta. Floyd-Warshall algoritm is part of dynamic programming which used for seek shorthes paths for every node/ verteks. The result of GIS application, it can beimplemented to determine the shortest path. The optimum shortes path information can help us to go to our destination faster.
AUTOMATIC DETECTION OF MOTORCYCLE ON THE ROAD USING DIGITAL IMAGE PROCESSING sutikno, sutikno; Wibawa, Helmie Arif; Saputra, Ragil
Scientific Journal of Informatics Vol 6, No 2 (2019): November 2019
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v6i2.20143

Abstract

Traffic accident is one of the causes of death in the world. One of them is traffic accidents on motorcyclist not wearing helmets. To overcome this problem, several researchers have developed detection system of motorcyclist not wear helmet. This system consists of motorcycle detection and motorcyclist head detection. On motorcycle detection, accuracy still needs to be improved. For this reason, this paper proposed motorcycle detection by adding image improvement processes that are enhancing contrast and adding object positioning features.The techniques proposed in this study are divided into 3 stages of image enhancement, feature extraction, and classification. The image enhancement stage consists of enhance contrast, convert RGB image to gray scale, background subtraction, convert gray scale image to binary, closing operation, and small object removal. The features used in this paper are the features of the object area, the circumference of the object, and the location of the object, while the method for classification process using back-propagation neural network and SVM. The proposed method resulted in an accuracy of 96.97%. Error occurs in all image test data not motorcycle objects detected as motorcycle objects. This error is caused because the pixel value between the objects in the image with the background color has a level of difference is too small, so it is detected as an object not a motorcycle.
RANCANG BANGUN FUEL PUMP PRESSURE TESTER PADA MOTOR INJEKSI Nasrullah, Hamid; Saputra, Ragil
Jurnal E-Komtek (Elektro-Komputer-Teknik) Vol 3 No 1 (2019)
Publisher : Politeknik Dharma Patria Kebumen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/e-komtek.v3i1.127

Abstract

Pressurized fuel is fuel that is pumped by a fuel pump (fuel pump) from the fuel tank to the injector. Fuel pressure that is too low will greatly affect the performance of the engine and the risk of engine failure. Fuel pressure measurement aims to determine the performance of the fuel pump (fuel pump) is still able to work well or not. The method used is a qualitative method. The construction design starts from the planning process which includes making the concept of design, observation and processing of data so that it is found that the design is capable of reading fuel pressure from the fuel pump and is easy to use. To strengthen the results of the study, it is complemented by a literature review that has close relevance to the subject matter. Based on the results of testing that has been achieved from the entire process of making and testing the design of fuel pump pressure tester on injection motors, it can be concluded that the functional test in the last process shows that the tool can work well and is able to provide information on fuel pressure measurements from the fuel pump.
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. 
Automatic Detection of Motorcycle on the Road using Digital Image Processing sutikno, sutikno; Wibawa, Helmie Arif; Saputra, Ragil
Scientific Journal of Informatics Vol 6, No 2 (2019): November 2019
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v6i2.20143

Abstract

Traffic accident is one of the causes of death in the world. One of them is traffic accidents on motorcyclist not wearing helmets. To overcome this problem, several researchers have developed detection system of motorcyclist not wear helmet. This system consists of motorcycle detection and motorcyclist head detection. On motorcycle detection, accuracy still needs to be improved. For this reason, this paper proposed motorcycle detection by adding image improvement processes that are enhancing contrast and adding object positioning features.The techniques proposed in this study are divided into 3 stages of image enhancement, feature extraction, and classification. The image enhancement stage consists of enhance contrast, convert RGB image to gray scale, background subtraction, convert gray scale image to binary, closing operation, and small object removal. The features used in this paper are the features of the object area, the circumference of the object, and the location of the object, while the method for classification process using back-propagation neural network and SVM. The proposed method resulted in an accuracy of 96.97%. Error occurs in all image test data not motorcycle objects detected as motorcycle objects. This error is caused because the pixel value between the objects in the image with the background color has a level of difference is too small, so it is detected as an object not a motorcycle.
DIGITAL MARKETING UNTUK PEMBERDAYAAN MASYARAKAT BINAAN YAYASAN SOKOGURU UNGARAN Ragil Saputra; Eko Adi Sarwoko; Dinar Mutiara KN; Rismiyati Rismiyati; Edy Suharto
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 4, No 1 (2021): Martabe : Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v4i1.123-130

Abstract

The Sokoguru Foundation is a non-governmental organization (NGO), with one of its activities which is a place for empowering the communities. After conducting an interview with the foundation managers and a survey of the member of the community, the results show that the ability to do entrepreneurship online is essential for the community. Therefore, the community services’ team provide training for the community about the use of social media, especially using Instagram to do digital marketing.This community service activity methodology uses a Participatory Rural Approach in the form of training and mentoring. The service is carried out in 3 stages: preparation, training and evaluation. Preparation is done by seeking information on material requirements for training. The training stage is carried out using an online system with Zoom Meeting (due to COVID-19 19 pandemic). Next, the training is filled with the presentation from the community service’s team, question and answer and sharing experiences.The result of the evaluation, this service activity adds new knowledge for participants (100%), usefulness (52.6%: very useful, 47.4%: useful). As well as increasing interest in online marketing by 73.7% from the previous 57%. Apart from scientific articles, the output of this activity is in the form of training modules, articles on the Kompas mass media, and video documentation on the YouTube channel.
Co-Authors Arif Wibawa, Helmie Ashari Arief, Ashari Bayu Surarso Dharmawan, Bagus Dwiky Dinar Mutiara KN Dinar Mutiara KN, Dinar Mutiara Edy Suharto Edy Suharto Eko Adi Sarwoko Hamid Nasrullah Hasbi Yasin Helmie Arif Wibawa Irfan Rizqi Prabaswara Khadijah Kurniawan, Sandy Mutiara, Dinar Priyo Sidik Sasongko Rismiyati Rismiyati Rismiyati RISMIYATI RISMIYATI Satriyo Adhy Suryono Suryono Sutikno Sutikno