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Jurnal INFOTEL

INFOTEL
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Published by Institut Teknologi Telkom Purwokerto

ISSN : 20853688 EISSN : 24600997 DOI : -

Core Subject : Science, Engineering,

Computer Science & IT Electrical & Electronics Engineering

Jurnal INFOTEL is a scientific journal published by Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) of Institut Teknologi Telkom Purwokerto, Indonesia. Jurnal INFOTEL covers the field of informatics, telecommunication, and electronics. It was firstly published in 2009 for a printed version and for online version in 2012. The aims of Jurnal INFOTEL are to disseminate research results and to improve the productivity of scientific publications. Jurnal INFOTEL is published quarterly in February, May, August and November. Starting in 2018, Jurnal INFOTEL uses English as the primary language.

Arjuna Subject : -

Articles 284 Documents

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Perancangan Penguat Daya L-Band Menggunakan Transistor GaAs p-HEMT MMG15241H Berbasis Mikrostrip Amiruddin, Rifki; Syihabuddin, Budi; Wahyu, Yuyu
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

The power amplifier which is designed by using BJT (Bipolar Junction Transistor) has a larger power consumption, hence in this research, the FET GaAs p-HEMT MMG15241H is used. The power amplifier designed in this research uses microstrip-based and works at the middle frequency of 1.27 GHz. This research yielded a power amplifier which works at the bandwidth with a range frequency of 1.265 - 1.275 GHz, a gain result of 20.02 dB, and input return loss result of -24.45 dB.

Design of Dual Band Microstrip Antenna at L-Band and S-Band Frequencies for Synthetic Aperture Radar (SAR) Sensors Fitriani, Binarti Fauziah; Wijanto, Heroe; Prasetyo, Agus Dwi
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Synthetic Aperture Radar (SAR) is a remote sensing system using radar for high resolution image capture. The higher frequency used, the higher accuracy of the image detail that obtained, while, the lower frequency has a better image penetration capabilities. To combine these two advantages of the image result characteristic, SAR is designed to operate in two bands (dual-band). In this study, a dual-band antenna on 1.27 GHz (L-Band) and 3 GHz (S-Band) using slotted patch technique and proximity coupled feeding is designed. The material that used is the FR4 Epoxy dielectric with the relative permittivity of 4.6. As a result, the antenna operates at the frequency of 1.27 GHz with the return loss of -25.131 dB, VSWR 1.1201, and 19.9 MHz (return loss <= -10 dB) bandwidth. While the return loss of 3 GHz is -16.802 dB, VSWR 1.3381, and bandwidth (return loss <= -10 dB) 125.3 MHz

Enhancement of K-Parameter Using Hybrid Stratified Sampling and Genetic Algorithm Ramadhani, Rima Dias; Priyanto, Agus; Sidiq, Muhammad Fajar
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Clustering is a technique used to classify data into clusters based on their similarities. K-means is a clustering algorithm method that classifies the objects based on their closest distance to the cluster center to the groups that have most similarities among the members. In addition, K-means is also the most widely used clustering algorithm due to its ease of implementation. However, the process of selecting the centroid on K-means still randomly. This results K-means is often trapped in local minimum conditions. Genetic algorithm is used in this research as a metaheuristic method where the algorithm can support K-means in reaching global optimum function. Besides, the stratified sampling is also used in this research, where the sampling functions by dividing the population into homogeneous areas using stratification variables. The validation value of the proposed method with iris dataset is 0.417, while the K-means is only 0.662.

Segmentasi Citra Kanker Payudara Menggunakan K-Means Clustering Berbasis Komputasi Parallel GPU Cuda Amalia, Andika Elok; Airlangga, Gregorius; Thohari, Afandi Nur Aziz
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Image processing technology is now widely used in the health area, one example is to help the radiologist to analyze the result of MRI (Magnetic Resonance Imaging), CT Scan and Mammography. Image segmentation is a process which is intended to obtain the objects contained in the image by dividing the image into several areas that have similarity attributes on an object with the aim of facilitating the analysis process. The increasing amount of patient data and larger image size are new challenges in segmentation process to use time efficiently while still keeping the process quality. Research on the segmentation of medical images have been done but still few that combine with parallel computing. In this research, K-Means clustering on the image of mammography result is implemented using two-way computation which are serial and parallel. The result shows that parallel computing gives faster average performance execution up to twofold.

Quality Analysis Of Library Information System Using Webqual Toward User Satisfaction Januarita, Dwi; Romadlon, Fauzan
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Websites for educational institutions is a form of information services that can be accessed online. One of the information services in educational institutions is library information system. This research focused on Institut Teknologi Telkom Purwokerto as an object of library information system implementation (dlibrary). Corresponding with the library strategy to become "user-friendly", the library of Institut Teknologi Telkom Purwokerto has provided information that follows user requirements and understanding. The one of user satisfaction for accessing the "dlibrary" is the provided quality information system. This research uses Webqual Method. Webqual method is a method for measuring the quality of information from web. This research is done by taking the perspective of the users about the information quality of the website. The 95% confidence level is used in this research, and the result on the dimensions of information quality (usability quality, information quality, and service interaction quality) has significant influence against the user satisfaction. It indicates that the content of the "dlibrary" information are accurate, complete, understandable, relevant and present information in accordance with the needs of the user.

Analisis User Throughput Based Mobility Load Balancing Menggunakan Prediksi Regresi Logaritmik Reference Signal Received Quality Di Jaringan Akses Radio Long Term Evolution Danisya, Achmad Rizal; Munadi, Rendy; Hertiana, Sofia Naning
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

The improvement of Long Term Evolution (LTE) radio access network services is affecting the increased value of traffic load in its network, which is causing traffic unbalance between cells in LTE Radio Access Network (RAN). Users will be served with ineffective resource block allocation which will make the total of gained throughput are not optimal. A method is required to move network load from overloaded cells to underloaded cells in order to balance the resource block allocation optimally. By using NS-3.26 simulation, User Throughput Based (UTB) predictive Mobility Load Balancing (MLB) method is tested with RandomWalkMobilityModel for each user. This method produces an improvement of 2,29 % in average of total throughput of 63,33 % successful optimization.

Multipath Effects in Building Environment Toward Bandwidth Enhancement for Mobile Communication of 47 GHz Frequency Eska, Andrita Ceriana
JURNAL INFOTEL Vol 10 No 1 (2018): February 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

This paper focused at communication system with multipath effects at building environment. The frequency that used for the communication system was 47 GHz. That frequency possibly used for higher bandwidth at communication system. The condition of communication propagation that used was downlink direction. Mobile station placed at track or street with buildings environment condition. This research analysis was based on transmitter power variation, bandwidth variation, and modulation threshold variation. That analysis produced signal to noise ratio value that was obtained from bandwidth variation and transmitter power variation. The transmitter power variation that used was consists of 0.01 Watt, 0.1 Watt, and 1 Watt. Threshold variations for communication modulation that used was consist of 16 QAM and 64 QAM. As the result such as bandwidth variation showed widened of bandwidth then more decreasing of signal to noise ration value, and more increasing of transmitter power then also more increase of signal to noise ratio value

Investigation of E-Health Acceptance Factor Purnawati, Ni Wayan; Setyohadi, Djoko Budiyanto; Suyoto, Suyoto
JURNAL INFOTEL Vol 10 No 2 (2018): May 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

The E-Health is used to support information technology to maximize the tasks and medical services in the hospital. However, the hospitalâ€™s management still have some issues due to E-Health implementation, particularly in the interaction with the system. This study identifies significant factors affecting the implementation of E-Health. Testing a model has been done, to identify factors affecting E-Health acceptance. Quantitative Research methods has been done is implemented in this research, by conducting a survey of 150 respondents on health practitioners in the District Hospital of Gunung Mas Province of Central Kalimantan. Random Sampling Method has been done is performed by doctors, nurses, medical record officers, and midwives. Meanwhile, model testing has been done with Structural Equation Model (SEM) analysis technique. The results of this study show that computer self-efficacy factor is the most powerful factor influencing user's opinion about perceived ease of use and perceived the usefulness of E-Health (significant p <0.05), followed by compatibility, top management support, information quality, system quality, facilitating condition, service quality, complexity, and adaptability. Hospital management needs to work together as a team effort to medical practitioners to apply E-Health in hospitals. Supports and awareness from various parties, such as government, IT support, and resources are expected to help implement E-Health in rural areas. The result of this study could be a decision in taking steps to implement E-Health in the future, in order to improve services of people in rural areas.

Performance Comparison of Dispersion Compensation Schemes Using DCF in DWDM Optical Network Khair, Fauza; Zulherman, Dodi; Fahmi, Fahmi
JURNAL INFOTEL Vol 10 No 2 (2018): May 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

The dense wavelength division multiplexing (DWDM) system enhances bandwidth capacity for long-haul communications system, but the system performance is affected by a chromatic dispersion especially in the high bitrate communication caused by different refractive index in pulse propagation for optical link. Using the Dispersion compensating fiber (DCF) can compensate for the positive dispersion in the optical link because it has negative dispersion value and can reduce the effect of the chromatic dispersion. We look for the suitable DCF scheme in our DWDM System using 16 channels with bitrate 40 Gbps per channel, channel spacing 200 GHz and optical link length 300 km and discuss the system performance to compensate dispersion in DWDM systems with the optical launch power variation. Based on the result, the system with the symmetrical scheme with optical power launch had the best performance with BER 8.33 Ã— 10-86 and Q-factor 19.572. Optical power launch had the effect to the system performance, the optical power launch 0 dBm in the all DCF scheme was not meet with ITU-T standard for optical link. In sequentially Q-factor of the pre-compensating, post compensating, and symmetrical compensating fiber schemes is 6.007, 6.209, and 6.608 which are not meet the ITU-T standard that Q-factor has to more than 7.20. The increasing optical power launch improved the system performance for all DCF scheme. In sequentially Q-factor of the symmetrical scheme with input power 0 dBm, 2 dBm, 4 dBm, 6 dBm, 8 dBm, and 10 dBm is 6.680, 8.510, 10.724. 13.340, 16.319, 19.572. This work obtains that the system with symmetrical compensating fiber more suitable than pre-compensating fiber and post-compensating fiber and the system with high optical launch power has better performance than low power.

A Custom Firmware and Lightweight Battery System Design for Portable RFID Reader Adiono, Trio; Kasan, Hans; Harimurti, Suksmandhira; Hariadi, Farkhad Ihsan
JURNAL INFOTEL Vol 10 No 2 (2018): May 2018
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Small to large-scale companies mostly have warehouses to store their inventories, and to manage them a warehouse management system is required. A low cost, yet powerful solution is using a portable RFID reader. In RFID portable reader system, there are three components which are the most essential, i.e. host and its firmware, RF module, and battery.. In this paper, we propose a custom firmware design, which is compatible with different RFID reader chips or development boards. The custom firmware is designed to work by triggering the execution of Electronic Product Code (EPC) Generation 2 protocol standard command on the reader chip. Hence, the firmware can fully utilize the reader chipâ€™s command. Furthermore, a lightweight battery system is also designed. Targeting for a high mobility use, a very lightweight Li-Pro battery, weighing of only 0.1 kg, is used for the battery system. It is also able to work at long operating hour up to 4 hours.

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Danny Kurnianto

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infotel@st3telkom.ac.id

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Kab. purworejo,

Jawa tengah

INDONESIA