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Bandwidth enhancement and miniaturization of circular-shaped microstrip antenna based on beleved half-cut structure for MIMO 2x2 application Teguh Firmansyah; Supriyanto Praptodiyono; Herudin Herudin; Didik Aribowo; Syah Alam; Dian Widi Astuti; Muchamad Yunus
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 2: April 2019
Publisher : Institute of Advanced Engineering and Science

In this paper, circular-shaped microstrip antenna was simulated, fabricated, and measured accordingly. As the novelty, to enhance bandwidth and reduce antenna size, beleved half-cut microstrip structure is proposed. Further, this proposed antenna structure will be applied to multiple input multiple output (MIMO) antenna 2´2. Therefore, this research was investigated conventional circular shape antenna (CCSA), circular shaped beleved antenna (CSBA), and MIMO circular shaped beleved antenna (MIMO-CBSA) as Model 1, Model 2, and Model 3, respectively. An FR4 substrate with er= 4.4, thickness h=1.6 mm, and tan d=0.0265 was used. The simulation has been conducted using Advanced Design System (ADS). The antenna CCSA/CSBA/ MIMO-CBSA achieve 1.831GHz/2.265 GHz/2.256 GHz, -15.13dB/-17.37dB/-17.25 dB, 1.42/1.31/1.33, and 1.474/2.332/2.322 for center frequency, reflection coefficient, VSWR, and bandwidth, respectively. This antenna has a size 63x90 mm and 51.5x90 mm for CCSA (Model 1) and CSBA (Model 2), respectively. After the structure of MIMO 2´2 was applied, the size of antenna MIMO-CBSA (Model 3) became 180 mm x 180 mm with a mutual coupling (S21)=-26.18 dB and mutual coupling (S31)=-26.41 dB. The result showed that proposed antenna CSBA (Model 2) has wider-bandwidth of 58,2% and smaller-size of 18.2%. Furthermore, after CSBA (Model 2) structure was applied to MIMO 2´2 (Model 3) and the MIMO antenna obtain good mutual coupling (<-15dB). Moreover, the measured results are good agreement with the simulated results. In conclusion, all of these advantages make it particularly valuable in multistandard antenna applications design such as GSM950, WCDMA1800, LTE2300, and WLAN2400.

Vertebra osteoporosis detection based on bone density using Index-Singh statistical blended method Siswo Wardoyo; Teguh Firmansyah; Noviana Prima; Wiyono Wiyono; Soenarto Soenarto; Djemari Mardapi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 1: February 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i1.14462

Osteoporosis is a progressive decrease in bone density so that the bones become brittle and broken. Bones are composed of minerals such as calcium and phosphate, so the bones become hard and solid. Many people do not realize that osteoporosis is a silent disease. Therefore, early detection of osteoporosis is very important. Detection of osteoporosis can be done by utilizing x-ray images of the vertebra. In this research the detection of bone density using blended statistical methods and Index-Singh. The x-ray sample used in this research was 50 images of osteoporosis patients. The result of the area calculation yields the highest white pixel is 7,983 pixels and the lowest white pixel is 5,410 pixels. Based on the results of these calculations, a statistical grouping is conducted into 6 Index-Singh. The range of statistical values is 5,410–6,266 pixels grouped into Index-Singh 1, range of data 6,323–6,512 pixels grouped into Index-Singh 2, the data range 6,520-6,747 pixels grouped into Index-Singh 3, data range 6,778-6,998 pixels grouped into Index-Singh 4, data range 7,001-7,219 pixels grouped into Index-Singh 5, and data range 7,338-7,983 pixels grouped into Index-Singh 6. Overall, the results of testing the osteoporosis detection system have been successful and can be used as an early detection system for osteoporosis. This assistance system has a detection accuracy of 76% compared to doctor's justification.

Performance comparison of transmitting jumbo frame on Windows and Linux System Supriyanto Praptodiyono; Rian Sofhan; Anggoro S. Pramudyo; Teguh Firmansyah; Azlan Osman
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 1: February 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i1.11627

IPv6 is the successor of IPv4, the current Internet Protocol that runs out its address. It offers some improvements including simpler header format and extension header resulting in faster transmission of IP packets. However, IPv6 is a network layer protocol that requires lower layer services. IP packets from the network layer pass to data link layer to be encapsulated by layer 2 headers and trailer to become frames. Ethernet is the most widely used data link layer protocol in the current network devices. The technology is always improved to support high speed transmission. However, from standard Ethernet until ten gigabit Ethernet, the size of MTU remains unchanged at 1500 Bytes. This prevents the network from gaining an optimum performance on transmitting IP packets and operating systems cannot take full advantage of the high-speed performance of Gigabit Ethernet. This research aims to implement the transmission of IPv6 packets using jumbo frame on a test-bed environment. The implementation can be used to justify the impact of jumbo frame on the network as well as operating systems performance. The results prove that the OS used on implementation of jumbo frame affects on the network performance. The highest percentage of increasing throughput is 33.6% when both sender and receiver are running Windows. The decreasing delay by 54.36% was happened when using Linux in sender and Windows in receiver.

Design of a Low Cost Remotly Operated Vehicle with 3 Dof Navigation Romi Wiryadinata; Annisa Sucianti Nurliany; Imamul Muttakin; Teguh Firmansyah
Bulletin of Electrical Engineering and Informatics Vol 6, No 1: March 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v6i1.596

One type of underwater robot is the ROV (Remotely Operated Vehicle) whose movements are controlled directly by humans from the water surface. In this paper, ROV prototype has been designed and tested with three DoF (Degrees of Freedom) and controlled by a joystick which is connected with UTP (Unshielded Twisted Pair) cables as data transmission between joystick with a microcontroller embedded in the robot. This prototype has 3 thrusters with 3 degrees of freedom, 1 rotational motion (heave) and 2 translational motion (yaw and surge), with direction of movement up, down, forward, backward, turn right, and turn left. Speed mode setting when forward movement on PWM (Pulse Width Modulation) 75% = 0,037 m/s, 90% = 0.053 m/s and 100% = 0,071 m/s, while the reverse speed by 75% = 0,034 m/s, 90% = 0.045 m/s and 100% = 0.059 m/s, when the ROV moves up is 0,042 m/s, down 0.032 m/s, turn right 9 o/s and turn left 15 o/s set with fixed PWM value, is 100%.

Design and Realization of Compact Microstrip Antenna Using Fractal Sierpenski Carpet For Wireless Fidelity Application Syah Alam; Indra Surjati; Awang Ferawan; Teguh Firmansyah
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 6, No 1: March 2018
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v6i1.390

This paper proposed new design of compact microstrip antenna using fractal sierpenski carpet method for Wireless Fidelity application at working frequency of 2400 MHz. The proposed antenna using FR4 Epoxy with (εr) of 4.3, substrate thickness (h) of 1.6 mm and loss tangent (tan δ) of 0.0265. Antenna is designed using AWR Microwave Office software.The sierpenski carpet method is used in order to reduce the dimensions of the microstrip antenna to become more compact. From the measurement results obtained reflection coefficient value -26.077 dB, VSWR 1.104 at working frequency of 2400 MHz frequency with a bandwidth of 127 MHz (2338 MHz – 2465 MHz). Beside that, by using fractal sierepenski carpet method, microstrip antenna dimension was reduced until 47.80% compared to conventional rectangular microstrip antenna.

Design of a Low Cost Remotly Operated Vehicle with 3 Dof Navigation Romi Wiryadinata; Annisa Sucianti Nurliany; Imamul Muttakin; Teguh Firmansyah
Bulletin of Electrical Engineering and Informatics Vol 6, No 1: March 2017
Publisher : Institute of Advanced Engineering and Science

One type of underwater robot is the ROV (Remotely Operated Vehicle) whose movements are controlled directly by humans from the water surface. In this paper, ROV prototype has been designed and tested with three DoF (Degrees of Freedom) and controlled by a joystick which is connected with UTP (Unshielded Twisted Pair) cables as data transmission between joystick with a microcontroller embedded in the robot. This prototype has 3 thrusters with 3 degrees of freedom, 1 rotational motion (heave) and 2 translational motion (yaw and surge), with direction of movement up, down, forward, backward, turn right, and turn left. Speed mode setting when forward movement on PWM (Pulse Width Modulation) 75% = 0,037 m/s, 90% = 0.053 m/s and 100% = 0,071 m/s, while the reverse speed by 75% = 0,034 m/s, 90% = 0.045 m/s and 100% = 0.059 m/s, when the ROV moves up is 0,042 m/s, down 0.032 m/s, turn right 9 o/s and turn left 15 o/s set with fixed PWM value, is 100%.

Deteksi Hujan Menggunakan Citra Satelit NOAA Frekuensi 137,9 MHz Menggunakan Morfologi Erison Endi Permata; Ri Munarto; Teguh Firmansyah
Journal Industrial Servicess Vol 3, No 1c (2017): Oktober 2017
Publisher : Fakultas Teknik Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jiss.v3i1c.2112

Cuaca merupakan faktor utama keselamatan untuk nelayan dan aktifitas pelayaran. Untuk itu diperlukan suatu sistem teknologi yang dapat mengetahui keadaan cuaca nasional dengan tepat. Teknologi satelit penginderaan jauh atau satelit NOAA merupakan jawaban atas masalah ini. Pada penelitian ini dilakukan perancancangan sistem pengolahan citra satelit NOAA frekuensi 137,9 MHz menggunakan morfologi erison. Penelitian ini memiliki beberapa keunggulan dalam sistem ini antara lain: otomatis memprediksi cuaca, berbasis opencv python (free), memiliki tingkat presisi yang tinggi dalam menggunakan kernel (1x1). Adapun metode yang digunakan adalah metode threshold untuk menentukan kecerahan warna awan.

Design of a Low Cost Remotly Operated Vehicle with 3 Dof Navigation Romi Wiryadinata; Annisa Sucianti Nurliany; Imamul Muttakin; Teguh Firmansyah
Bulletin of Electrical Engineering and Informatics Vol 6, No 1: March 2017
Publisher : Institute of Advanced Engineering and Science

One type of underwater robot is the ROV (Remotely Operated Vehicle) whose movements are controlled directly by humans from the water surface. In this paper, ROV prototype has been designed and tested with three DoF (Degrees of Freedom) and controlled by a joystick which is connected with UTP (Unshielded Twisted Pair) cables as data transmission between joystick with a microcontroller embedded in the robot. This prototype has 3 thrusters with 3 degrees of freedom, 1 rotational motion (heave) and 2 translational motion (yaw and surge), with direction of movement up, down, forward, backward, turn right, and turn left. Speed mode setting when forward movement on PWM (Pulse Width Modulation) 75% = 0,037 m/s, 90% = 0.053 m/s and 100% = 0,071 m/s, while the reverse speed by 75% = 0,034 m/s, 90% = 0.045 m/s and 100% = 0.059 m/s, when the ROV moves up is 0,042 m/s, down 0.032 m/s, turn right 9 o/s and turn left 15 o/s set with fixed PWM value, is 100%.

Enhancing IPsec Performance in Mobile IPv6 Using Elliptic Curve Cryptography Supriyanto Praptodiyono; M. Iman Santoso; Teguh Firmansyah; Ali Abdurrazaq; Iznan H. Hasbullah; Azlan Osman
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 6: EECSI 2019
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eecsi.v6.2004

Internet has become indispensable to the modern society nowadays. Due to the dynamic nature of human activities, the evolving mobile technology has played a significant role and it is reflected in the exponential growth of the number of mobile users globally. However, the characteristic of the Internet as an open network made it vulnerable to various malicious activities. To secure communication at network layer, IETF recommended IPsec as a security feature. Mobile IPv6 as the successor of the current mobile technology, Mobile IPv4, also mandated the use of IPsec. However, since IPsec is a set of security algorithm, it has several well-known weaknesses such as bootstrapping issue when generating a security association as well as complex key exchange mechanism. It is a well-known fact that IPsec has a high overhead especially when implemented on Mobile IPv6 and used on limited energy devices such as mobile devices. This paper aims to enhance the IPsec performance by substituting the existing key exchange algorithm with a lightweight elliptic curve algorithm. The experiments managed to reduce the delay of IPsec in Mobile IPv6 by 67% less than the standard implementation.

Penggunaan Monitoring Mandiri melalui Sistem Informasi Pemantauan Obesitas Remaja (Sifortasima) dalam Pencegahan Obesitas Remaja Nourmayansa Vidya Anggraini; Serri Hutahaean; Teguh Firmansyah; Muchamad Rifki Nuryanta; Vionita Apriliana; Bonieta Dwi Lestati; Muhammad Harits Saifulloh; Nita Junita
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 5, No 11 (2022): Volume 5 No 11 November 2022
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v5i11.7640

ABSTRAK Obesitas termasuk salah satu masalah kesehatan yang membuat risau kalangan masyarakat. Peningkatan prevalensi obesitas terjadi di Negara maju dan berkembang. Obesitas juga berisiko pada remaja. Kegiatan pengabdian kepada masyarakat dilakukan dengan penyediaan program Sistem Informasi Pemantauan Obesitas Remaja (SIFORTASIMA) yang berpihak pada remaja, murah, mudah digunakan, aman dan aman untuk diakses setiap waktu diharapkan mampu menjawab kebutuhan remaja di sekolah pada saat ini. SIFORTASIMA sebagai media promosi pemantauan obesitas yang merupakan program PKM dari, oleh, dan untuk remaja di sekolah. Metode yang dilakukan dalam kegiatan pengabdian kepada masyarakat ini adalah dengan memberikan pendidikn kesehatan dan pelatihan tentang monitoring mandiri menggunakan Sistem Informasi Pemantauan Obesitas Remaja (SIFORTASIMA) pada remaja. Kegiatan ini memberikan hasil berupa peningkatan pengetahuan pada remaja sasarannya pada sebelum dan sesudah dilakukan proses pendidikan kesehatan dan pelatihan berkaitan dengan penggunaan aplikasi SIFORTASIMA. Disarankan supaya remaja dapat menggunakan aplikasi dengan teratur supaya dapat mengendalikan dan mencegah terjadinya obesitas. Namun pihak orang tua dan guru tetap harus melakukan pemantauan dalam penggunaan aplikasi ini. Kata Kunci: Obesitas, Remaja, SIFORTASIMA ABSTRACT Obesity is one of the health problems that worries the community. The increasing prevalence of obesity occurs in both developed and developing countries. Obesity is also a risk in adolescents. Community service activities are carried out by providing the Adolescent Obesity Monitoring Information System (SIFORTASIMA) program that is pro-adolescent, inexpensive, easy to use, safe and secure to be accessed at any time. SIFORTASIMA as a promotional media for obesity monitoring which is a PKM program from, by, and for teenagers in schools. The method used in this community service activity is to provide health education and training on independent monitoring using the Adolescent Obesity Monitoring Information System (SIFORTASIMA) in adolescents. This activity resulted in an increase in knowledge of the target youth before and after the process of health education and training related to the use of the SIFORTASIMA application. It is recommended that adolescents can use the application regularly in order to control and prevent obesity. However, parents and teachers still have to monitor the use of this application. Keywords : Obesity, Youth, SIFORTASIMA

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