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Jurnal INFOTEL
Jurnal Infotel merupakan media publikasi ilmiah dalam rangka untuk meningkatkan kualitas dan kuantitas penelitian civitas akademika baik dari lingkungan Sekolah Tinggi Teknologi Telematika Telkom Purwokerto (ST3 Telkom) ataupun dari luar ST3 Telkom dibidang Informatika, Telekomunikasi dan Elektronika
Articles
420
Articles
Analisis Performansi Perubahan RAW Slot Pada Standar IEEE 802.11ah

Oktaviana, Ana, Perdana, Doan, Negara, Ridha Muldina

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

The increasing needs and demands of diverse services by the users to be able to exchange and obtain information in real time, reliable, and flexible to be one of the problems faced by existing communication technology. WLAN on the IEEE 802.11 standard is one of the wireless technologies that can be the solution of the problem. It has a relatively small area of ??communication that is between 20-70 meters only, only able to serve up to 2007 stations, and has considerable energy consumption, causing some systems contained in the WLAN in IEEE 802.11 standard less work maximally. With these shortcomings, the WLAN on the IEEE 802.11 standard introduces a new task group called IEEE 802.11ah. IEEE 802.11ah is a new WLAN standard working on the 900 MHz frequency spectrum, a 1 kilometer communications coverage area, capable of serving 8192 stations with new AID hierarchies, has lower energy consumption and can increase throughput value by RAW mechanism. This study will make changes to the number of RAW slots in the IEEE 802.11ah to see how they affect the network performance. In this research it is found that the change of RAW slot number influence to network performance, in this case is throughput, average delay, packet delivery ratio and energy consumption.

Analisis Koeksistensi Jaringan LTE Non Lisensi dan Wi-Fi Pada Frekuensi 5GHz

Rachmapramita, Arum, Adriansyah, Nachwan Mufti, Syihabuddin, Budi

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

By the 2020 the traffic internet demand will be increasing, so that the utilization of spectrum frequency should be maximize and use wisely. LTE-U which is using unlicensed spectrum frequency may be option to fulfil the demand of the internet traffic. Unfortunately it has to adapt and coexistence with Wi-Fi which already exist in unlicensed spectrum frequency. In this research, will talk about the minimum distance needed so that LTE-U eNodeB and Wi-Fi can be coexistence in indoor and outdoor deployment LOS and NLOS condition. The coexistence analyze in ACIR value. The result, minimum distance needed is in range 16 m-35 m for indoor deployment. In the other hand 51 m-199 m for outdoor deployment. With software simulation in 51 m distance the mean CINR value is 15 dB, and for 16 m distance the mean SIR value is 0.62 dB.

Ekstraksi Pola Kesalahan Jawaban Siswa Menggunakan Algoritma Apriori

Rodiyansyah, Sandi Fajar, Mardiana, Ardi

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

Ujian Nasional (UN) or national exam is the final stages of a student in completing his/her studies at formal education level. Each year students prepare for the exam. To assist the preparation of students in facing the national exam, schools generally make extra hour lessons. In this activity, usually the discussion about the test of previous years. Teachers need a way of selecting the discussion of the issues that need to be given for time efficiency. Apriori Algorithm is used for the extraction analysis of students error patterns. The results obtained are the pattern of student error answers so that teachers can focus on providing additional material on the questions that are still answered wrong by students

Perbaikan Missing value Menggunakan Pendekatan Korelasi Pada Metode K-Nearest Neighbor

Wijono, Wijono, Setyawati, Onny

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

Missing value often occur in classification method that is caused by information on the object is not given, it is difficult to find, or because of the information is unavailable. It will cause the decrement of accuracy and data quality during it is analyzed. Correlation approach was conducted because it should be known the existence and the strength of variable correlation in related to an object or subject studied. Classification method used is K-NN method. It is because this method is included in classification method that has strong consistency by finding the case through calculation on the closeness between the case with the old one based on K value or the nearest neighbor. Correlation approach can be done to overcome missing value, as evidenced by the increasing classification results and the loss of unclassified data. Questionnaire as a measuring tool, the questionnaire contains some questions given to the respondent, from the results of questionnaires conducted data analysis to determine the level of correlation of data backup. After getting the level of backup data correlation, then the backup data is used as a substitute for missing data value. Before the replacement of data there is missing value classification of 500 data classified natural science major 88 students, social science major 126 students, the language major 271 students, and unclassified / false 15 students. After the replacement of data there is missing value from 500 data, it can be classified into natural science major 102 students, social science major 316 students, the language major 82 students, and no unclassified data. Based on the experimental results, the value of k = 3, 5, 7, 9, and 11. It can be seen that k = 5 has a high accuracy of 97.0%, so in this study majors using K-NN method set k value used is 5.

Rancang Bangun Robot Penghindar Halangan Berbasis Kamera Menggunakan Deteksi Kontur

Joni, Koko, Abidin, Zainal, Ibadillah, Achmad Fiqhi

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

So far, most obstacle avoidance robots are built using reference from some distance sensors placed on the robot body, the weakness of this system is that robots can only avoid obstacles without knowing where the target is located. In this research built a camera-based obstacle avoidance robot with 0.67x wide lens placed 2 meters above the arena, so that the position of robots, obstacles and targets can be known in real-time. The image of the camera will be processed using a laptop that has installed the application CodeBlocks with OpenCV library, the output is a character command movement of a DC motor that is sent on the robot through bluetooth communication. Contour detection is used to distinguish selected objects with surrounding disruptions. From the test results, the HSV range calibration system developed has been able to produce accurate color ranges for color filtering, using auto-click and tuning-manual methods. The actual distance testing calibration based on pixel distance produces a linear graph trend, so the linear equations can be used to convert pixel spacing to actual distance in centimeters. Robot rate test results, built systems can make the robot walk closer to the target and avoid obstacles in front of the robot, although sometimes experienced oscillation but the robot is able to return stable, this is because the built system does not use oscillation damper method such as PID. Keywords - Robot Avoidance, Camera, Contour Detection.

Perancangan dan Implementasi Sistem Informasi Akuntansi Berbasis Android

Prabowo, Fariz, Sari, Rika Perdana, Arfan, Tobi

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

Maestro Accessories Duri requires a software that can record shop activities and presents financial information accessed quickly and accurately using smartphone. Therefore, this study is made to solve the problem by building an accounting information system (AIS) based on Android. The AIS is built by using Android Studio as an integrated development environment (IDE), and MySQL as database. The testing of this study is user acceptance testing (UAT) method done by shop owner, where the first stage of UAT results 76.9% in satisfaction with 52 testing units as success indicator. The second stage of UAT tells there are 15 testing units which have 98.1% of success, and the third one has 3 testing units with 100% in satisfaction. This study is analyzed by using interview method which is two times done. The first interview is done with a teaching staff of accountancy study program in Caltex Polytechnic of Riau as interviewee which aims to obtain information about feasibility of Android AIS Maestro that is from an independent individual’s perspective who has competence in accounting. The second interview is held to find information about performance of the software from client’s point of view who is the owner of Maestro Accessories. 

Rancang Bangun Layer Fisik Visible Light Communication Pada Sistem Transmisi Audio

Fuada, Syifaul, Adiono, Trio

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

Currently, LED functions not only as illumination purpose but also can be used as a communication device. Commonly, this technology is called as "visible light communication (VLC)", which has begun to be applied in areas susceptible to electromagnetic waves, such as hospitals, aircraft cabins, airports, military headquarters and etc. Generally, the media, which is used as object of the data transmission, e.g. digital images, video, audio (music only), texts, and even data packets for internet browsing purposes. This research implements a VLC system that focuses on the physical layer, especially in Analog Front-End (AFE) part. The designed system consists of an AFE transmitter module as a modulator and an AFE receiver as a demodulator. The designing AFE transmitter adopts the Bias-T module principle, it has same the functionality but extremely lower in the cost factor. While in the AFE receiver part, the DC-offset remover module is implemented, it has a function to reduce the DC signal that generated from ambient light. The results of demonstration show that the system, functionally, can be used for transmitting audio signals via visible light and the received data can be displayed to the loudspeaker directly.  In this work, the data observation is done by comparing the amplitude of input signal connected to the driver LED against the output signal from the last stage of the AFE receiver. From the test results, it can be shown that the optimum bandwidth of the AFE transceiver is about 50 kHz to 450 kHz (with attenuation at fc = -3 dB as a reference) and the maximum distance for data transmission is 40 cm and angle of reception is 0o

Analisis Pengaturan Sistem Catu Daya Pada Satelit Nano

Rafsanzani, Fasny F. A, Syihabuddin, Budi, Edwar, Edwar, Wijanto, Heroe

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

The success of a nanosatellite mission is depend on the reliability of the Electrical Power System (EPS) to ensure the subsystems on the nanosatellite working properly. Therefore, an effective power distribution control is required. This research will explain how to distribute electrical power effectively to the subsystems according to the condition of the nanosatellite (sunlight or eclipse). To illustrate this, a simulation and analysis of the EPS power management module design consisting the LT3757 boost converter and LT3652 battery charger were performed. From the simulation results, it will be seen that when the nanosatellite is exposed to the sun, the system will distribute the power to the load using the input power from the panel surya that has passed the boost converter component (12 Volt), while charging the battery until it’s fully charged (7,4 Volt). But during the eclipse phase the system will supply the load with the power generated by the battery (7,4 Volt)

Pujiharsono, Herryawan

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

The improvements in computer technology make image processing developed widely to help people in various areas of work. However, some work can’t be developed with image processing because it doesn’t support the use of computers and it encourages the development of image processing with a microcontroller or special microprocessor. The improvement of microcontrollers and microprocessors features currently allows image processing can be developed with embedded computers. This study aims to test the performance of embedded computers for image processing and then compare the results with the performance of general purpose computer. The result shows that the optimized execution time of embedded computer is better than general purpose computer with the comparison of average execution time of embedded computer is 4-5 times slower than the general purpose computer and the maximal image size that does not make the CPU overload for embedded computer is 256x256 pixel and for general purpose computer is 400x300 pixels.

Manajemen Pengetahuan Melalui Web 2.0 (Wikipedia) pada Organisasi

Angela, Delfi, Yunanto, Wawan, Widyasari, Yohana Dewi Lulu

JURNAL INFOTEL Vol 9 No 3 (2017): Agustus 2017
Publisher : LPPM SEKOLAH TINGGI TEKNOLOGI TELEMATIKA TELKOM PURWOKERTO

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Abstract

Student association is a place for every student of certain majors, which is intended to accommodate the aspirations of all its members. Knowledge sharing process usually done through direct meetings in the classroom and discussions. Knowledge Management System can manage knowledge and document of each member so that the process of knowledge sharing is not impeded. This study develops a web 2.0 knowledge management system with the concept of Wikipedia. Wikipediaâ??s concept is applied to allow each member of organization to add, delete, and edit the content of the website. Information and knowledge can be used and updated continuously by fellow members of organization. Knowledge management process that used in this system is knowledge discovery, knowledge capture and knowledge sharing. The result of User Acceptance Test is knowledge management system has been accepted by the Organization in assisting organization members develop knowledge and acquire new knowledge

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