Arkhan Subari
PSD III Teknik Elektro Fakultas Teknik, Universitas Diponegoro Jl. Prof. Sudharto, SH, Kampus UNDIP Tembalang, Semarang 50275, Indonesia

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Implematasi Aeschipper Class Untuk Enkripsi URL di Sistem Informasi Akademik Fakultas Teknik Universitas Diponegoro Subari, Arkhan; Manan, Saiful
Jurnal Sistem Komputer Vol 4, No 2 (2014)
Publisher : Jurnal Sistem Komputer

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In web programming GET method can use to send data from client to server. Weaknees of the GET method is the appearance of transmitted data or variables in the URL. Users can easily change variables used and when it is executed, variable data will also be executed. It is very vulnerable to attack by malicious users with some techniques such as XSS or SQL injection. These weaknesses can be resolved with use encryption techniques to URLs that use the GET method, such as AES encryption. The process is encrypt variables on client side and decrypt on server side to retrieve actual data. Thus variable is not shown in the URL, so if there will be an attack attempt difficult. Academic Information System (AIS) of Engineering Faculty, as a web-based application also uses several modules that use the GET method for sending data. Thus addition of the security level using the URL encryption is needed to improve security of system and data on the AIS. The result is a variable that is sent with GET method is not display on URL on three modules, namely the main menu page, change the password and a link out of the syste . The encryption process adds time access to system by an average of 0:05 s, so that the outline does not affect system performance . Keywords: web applications, POST and GET, URL, encryption, AES, academic information system.
PERBANDINGAN PENGARUH PENEMPATAN ARRESTER SEBELUM DAN SESUDAH FCO SEBAGAI PENGAMAN TRANSFORMATOR 3 PHASA TERHADAP GANGGUAN SURJA PETIR DI PENYULANG PANDEAN LAMPER 5 RAYON SEMARANG TIMUR Wardana, Azis Nurrochma; Subari, Arkhan
GEMA TEKNOLOGI Vol 18, No 1 (2014): Periode April 2014 - Oktober 2014
Publisher : GEMA TEKNOLOGI

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Azis Nurrochma Wardana, Arkhan Subari, in paper comparison of the effect of placement arrester before and after FCO as safety of 3 phase transformator from interruption of lightning at Pandean Lamper 5 Feeder, East Semarang explain that problem of the studied is location of arrester at distribution which have is same function and target but owning location of different arrester. Location of arrester  relate to wiring of arrester with transformer and fuse Cut Out (FCO) owning target to give protection at transformer of over voltage. In the last location of this arrester require to study again about its efficacy of its at transformer. Efficacy of pr otection at such transformer is efficacy of passed to protection is transformer by minimizing over voltage that happened at the transformer so that equipments and transformer which its of him do not experience of damage. By considering factor influencing the level of voltage of surge and current of surge that happened at each system, like wiring of arrester, length of wire, apart arrester which is utilized in system location of arrester, steepness of wave come, speed creep waving surge, and Basic InsulationLevel (BIL) equipments, so that is in the final got one of location of correct arrester as 20 kV distribution transformer protection. Keywords: Arrester, Distribution Transformer, Fuse Cut Out, Lightning Surge
RANCANG BANGUN APLIKASI PENGUKURAN TINGGI BADAN, BERAT BADAN, SUHU TUBUH, DAN TEKANAN DARAH BERBASIS MIKTROKONTROLER ATMEGA16 Dewi, Ratih Kusuma; Subari, Arkhan
GEMA TEKNOLOGI Vol 17, No 1 (2012): Periode April 2012 - Oktober 2012
Publisher : GEMA TEKNOLOGI

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Ratih Kusuma Dewi, Arkhan Subari, in paper design and application of measurement stature , body weight , body temperature , and pressure based miktrokontroler atmega16 explain that now almost all uses of automation , both in the world of health . Equipment needed is the automation of the measurement tool capable of measuring several variables simply using a tool . The tool consists of ultrasonic sensors as a means of height measurement , the sensor strain guage as a means of weight measurement , LM35 temperature sensor as a means mengkuran body temperature , as well as a combination of MPX5100DP pressure sensors , motor driver , relay driver , as well as a mini compressor pressure gauge blood . The method used in the manufacture and testing of the tool by comparing the output of this tool with measuring devices in the market . The measurement results will be issued in the form of LCD , Voice Processor , and Database . Height measurement tool using these tools has a percentage error of 1.52 % , while for 2.314 % of body weight , body temperature by 1.62% , to pressure systole of 1.41 % , and for the pressure dystole of 0.858 % . Keywords : Ultrasonic Sensor, Strain Guage Sensor, Sensor LM35, MPX 5100DP, Microcontroller ATMega16.
ALAT PENGUKUR DETAK JANTUNG MENGGUNAKAN PULSESENSOR BERBASIS ARDUINO UNO R3 YANG DIINTEGRASIKAN DENGAN BLUETOOTH Wohingati, Galuh Wahyu; Subari, Arkhan
GEMA TEKNOLOGI Vol 17, No 2 (2013): Periode Oktober 2012 - April 2013
Publisher : GEMA TEKNOLOGI

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Galuh Wahyu Wohingati, Arkhan Subari, in paper pulse measuring tool using pulsesensor based on Arduino Uno R3 integrated with Bluetooth explain that emerging disease and claimed the lives of many people is often due to late treatment , when it should be in the modern era has many tools made to overcome this problem , medical devices can only be used by medical experts , and of course takes time and no small cost . as well as heart disease which sometimes can only be detected when it is advanced because of the lack of monitoring , both from people who are sick or from a doctor . Other factors that cause costs adalahkesibukan and not everyone can do medical check- ups regularly . Whereas By knowing the health condition of a persons heart rate will then be awake , do not need expensive care from a doctor , but could by changing lifestyle . Therefore it needs to be made a tool that can measure heart rate , showing whether or not the condition of the heart and of course, this tool can be used by everyone without kecuali.Dengan development of technology and the number of components on the market which can be accessed , Arduino Uno facilities in R3 can be used . Arduino is a physical computing platform that is open source means , Arduino can be developed by many people , not just programmers .But not just a development tool , Arduino is a combination of hardware , programming language and integrated development environment ( IDE ) that is advanced . Paired with a pulse sensor , a media reader analog heart rate is then converted into digital data that is in the readings , then integrated using serial bluetoothsecara so it can be displayed on your android smartphone and used repeatedly as needed measurements .. Keywords : Arduino Uno R3 , pulse sensor , Bluetooth
PEMANFAATAN SMS GATEWAY DENGAN GAMMU DAN WEBCAM BERBASIS VISUAL BASIC 6.0 PADA SISTEM KEAMANAN RUMAH Islahuddin, Muhammad Ishaq; Subari, Arkhan
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
Publisher : GEMA TEKNOLOGI

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Abstract

Muhammad Ishaq Islahuddin, Arkhan Subari, in this paper explain that in a home security system is very important information dissemination system. One of them by the use of SMS Gateway. By using Gammu and MySQL as a database and use a webcam as a tool for monitoring room in the house. The way this system works is a home security system using a PIR sensor detecting human movement. After that, if the data from the sensors in the microcontroller. Microcontroller then sends the data to a computer through a serial port. On the computer there is a VB 6.0 application. when the PIR sensor detects the presence of a human, the computer will be otomstis capture and send SMS alerts to a database of numbers that have been stored. Keywords : Webcam, SMS Gateway, Gammu, MySQL, Visual Basic 6.0 .
PERENCANAAN FILTER PASIF UNTUK MENINGKATKAN KUALITAS DAYA LISTRIK DI KAMPUS DIPLOMA III FAKULTAS TEKNIK UNDIP Subari, Arkhan; Manan, Saiful
GEMA TEKNOLOGI Vol 17, No 4 (2014): Periode Oktober 2013 - April 2014
Publisher : GEMA TEKNOLOGI

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Abstract

Arkhan Subari, Saiful Manan, in this paper explain that most electronic equipment is non-linear load. Likewise with the equipment in campus buildings Diploma III Faculty of Engineering. Non-linear load is a load that has a voltage waveform supplied from non sinusiodal although sinusoidal voltage. Non-sinusoidal wave causes the shape of the voltage becomes distorted or defects that result in decreased quality of power. The defect wave called harmonics. To dampen harmonics on non-linear load can be used filter. With the addition of a filter on the power system, then the waves of unwanted harmonics can be suppressed as small as possible. In addition, harmonic filter at the fundamental frequency can compensate for reactive power and is used to improve the power factor of the system. From the measurement results in the Diploma Program Campus FT Undip found that the influence of harmonic waves big enough. THDv reached 32.13% while the THDi amounted to 7.85%. It affects so cos phi cos phi measured just 0.72. After the installation of a passive filter, the value THDv and THDi be good lebik ie 1.61% and 0.39% to reach 0.94 cos phi measured. Key word: non-linear loads, non-sinusoidal waveform, harmonics, power factor, filter LC
OPTIMASI PELAKSANAAN PENERTIBAN PEMAKAIAN TENAGA LISTRIK (P2TL) SEBAGAI UPAYA PENINGKATAN SAVING KWH DAN PENEKANAN SUSUT NON TEKNIS DI PT. PLN (PERSERO) RAYON SEMARANG SELATAN Novena Putri, Irene Ega; Subari, Arkhan
GEMA TEKNOLOGI Vol 18, No 2 (2015): Periode Oktober 2014 - April 2015
Publisher : GEMA TEKNOLOGI

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Abstract

Irene Ega Novena Putri, Arkhan Subari, in this paper explain that this study will describe the existing condition P2TL implementation in Rayon South Semarang, examine the root of the problem of lack of optimal implementation of P2TL, and describes efforts to optimizing the implementation in Rayon P2TL South Semarang. The method used is a combination of quantitative and qualitative. The approach used to establish the conditions of implementation P2TL is through observation by setting a good standard P2TL, examining implementation procedures and examined the results of the implementation P2TL P2TL in January-March and discussed the obstacles in its implementation. The approach used to discuss in detail P2TL performance in January-March was through discussion violations committed customers, the amount of saving kWh for three months, the effect of saving kWh in the percentage of shrinkage, and effort optimizing the performance of P2TL. Results of this research note that saving kWh obtained in January-March amounted to 48 599 kWh, or approximately 13% of the targeted savings through the implementation P2TL kWh, thus concluded that the performance P2TL not optimal. Effect of kWh saved is able to suppress shrinkage in January by 0.16% and in March by 0.5%. Efforts should be made in order to optimize the implementation of technically P2TL is through Early Detection of Violations. Efforts should be made in order to optimize the implementation of the non technical P2TL is through targeting of saving kWh monthly, fixing TO Rayon, a sweeping legalization customers, regeneration P2TL implementation team, and socialization prepaid electricity. Keywords: P2TL, shrinkage, saving kWh, TO.
SETTING RELAY DIFFERENSIAL PADA GARDU INDUK KALIWUNGU GUNA MENGHINDARI KEGAGALAN PROTEKSI Yuniarto, Yuniarto; Subari, Arkhan; Kusumastuti, Dinda Hapsari
TRANSMISI Vol 17, No 3 Juli (2015): TRANSMISI
Publisher : Jurusan Teknik Elektro Fakultas Teknik – Universitas Diponegoro

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Abstract

Abstrak Proteksi adalah suatu bentuk perlindungan terhadap peralatan listrik yang ada guna menghindari kerusakan peralatan dan juga agar stabilias penyaluran tenaga listrik tetap terjaga. Bagian dari sitem proteksi adalah trafo arus atau trafo tegangan , pengawatan, dan sumber AC/DC. Trafo arus terbagi menjadi dua fungsi yaitu sebagai pengukuran dan proteksi. Salah satu relay yang digunakan yaitu relay differential yang merupakan pengaman utama transformator yang bekerja tanpa koordinasi dengan relay yang lain. Relay differential sendiri mempunyai beberapa syarat yang harus dipenuhi sebagai pengaman, diantaranya:CT yang digunakan harus mempunyai ratio perbandingan yang sama sehingga Ip = Is serta sambungan dan polaritas CT1 dan CT2 sama. Yang kedua pemasangan Auxiliary CT yang terhubung Y karena harus membandingkan arus pada dua sisi tanpa perbedaan fasa. Yang terakhir adalah karakteristik kejenuhan CT1 dan CT2 harus sama. Untuk itu perlu dilakukan setting relay differential dengan perhitungan pemilihan ratio CT, perhitungan ACT, setting relay differential itu sendiri dan error mismatch. Error mismatch pada trafo arus masih dibawah batas maksimal yaitu 5% karena didapat hasil perhitungan masing-masing trafo arus baik pada sisi 150 kV dan 20 kV sebesar 1,129% dan 0,721%. Kata kunci: CT, setting, relay differential  Abstract Protection is a form of protection against existing electrical equipment to avoid damage to the equipment and also that stabilias electrical power supply is maintained. Part of the system of protection is current transformer or voltage transformer, wiring, and the source of AC / DC. Current transformer is divided into two functions, namely a measurement and protection. One relay used is a differential relay which is a major safety transformer that works without coordination with the other relay. Differential Relay itself has several requirements that must be met as a safety, including: CT used must have the same ratio so that the ratio Ip = Is as well as connection and CT1 and CT2 same polarity. The second installation connected Auxiliary CT Y having to compare the current on the two sides without a phase difference. The latter is characteristic of CT1 and CT2 saturation should be the same. It is necessary for setting differential relay with a CT ratio electoral calculation, calculation ACT, setting differential relay itself and mismatch error. Error mismatch in the current transformer is still below the maximum limit of 5% as the result of each calculation of the current transformer on either the 150 kV and 20 kV amounting to 1.129% and 0.721%. Keywords : CT , setting , differential relays   Abstrak Proteksi adalah suatu bentuk perlindungan terhadap peralatan listrik yang ada guna menghindari kerusakan peralatan dan juga agar stabilias penyaluran tenaga listrik tetap terjaga. Bagian dari sitem proteksi adalah trafo arus atau trafo tegangan , pengawatan, dan sumber AC/DC. Trafo arus terbagi menjadi dua fungsi yaitu sebagai pengukuran dan proteksi. Salah satu relay yang digunakan yaitu relay differential yang merupakan pengaman utama transformator yang bekerja tanpa koordinasi dengan relay yang lain. Relay differential sendiri mempunyai beberapa syarat yang harus dipenuhi sebagai pengaman, diantaranya:CT yang digunakan harus mempunyai ratio perbandingan yang sama sehingga Ip = Is serta sambungan dan polaritas CT1 dan CT2 sama. Yang kedua pemasangan Auxiliary CT yang terhubung Y karena harus membandingkan arus pada dua sisi tanpa perbedaan fasa. Yang terakhir adalah karakteristik kejenuhan CT1 dan CT2 harus sama. Untuk itu perlu dilakukan setting relay differential dengan perhitungan pemilihan ratio CT, perhitungan ACT, setting relay differential itu sendiri dan error mismatch. Error mismatch pada trafo arus masih dibawah batas maksimal yaitu 5% karena didapat hasil perhitungan masing-masing trafo arus baik pada sisi 150 kV dan 20 kV sebesar 1,129% dan 0,721%. Kata kunci: CT, setting, relay differential Abstract Protection is a form of protection against existing electrical equipment to avoid damage to the equipment and also that stabilias electrical power supply is maintained. Part of the system of protection is current transformer or voltage transformer, wiring, and the source of AC / DC. Current transformer is divided into two functions, namely a measurement and protection. One relay used is a differential relay which is a major safety transformer that works without coordination with the other relay. Differential Relay itself has several requirements that must be met as a safety, including: CT used must have the same ratio so that the ratio Ip = Is as well as connection and CT1 and CT2 same polarity. The second installation connected Auxiliary CT Y having to compare the current on the two sides without a phase difference. The latter is characteristic of CT1 and CT2 saturation should be the same. It is necessary for setting differential relay with a CT ratio electoral calculation, calculation ACT, setting differential relay itself and mismatch error. Error mismatch in the current transformer is still below the maximum limit of 5% as the result of each calculation of the current transformer on either the 150 kV and 20 kV amounting to 1.129% and 0.721%. Keywords : CT , setting , differential relays
RANCANG BANGUN SISTEM MONITORING KEAMANAN RUMAH BERBASIS WEB MENGGUNAKAN RASPBERRY PI B+ SEBAGAI SERVER DAN MEDIA KONTROL Syabibi, Muhammad Khoiru; Subari, Arkhan
GEMA TEKNOLOGI Vol 19, No 1 (2016): Periode April 2016 - Oktober 2016
Publisher : GEMA TEKNOLOGI

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Abstract

Muhammad Khoiru Syabibi, Arkhan Subari  in this paper explain that Along with the progress of era, the development of advanced technology also impacts on the development of security systems. Sophisticated security systems that digitally integrated has been growing, one of them is a web-based security system. This web-based home security monitoring system uses a raspberry pi b + that serves as a server and media controller, then for the web programming, it uses HTML, CSS and Javascript. This web-based home security monitoring system home uses a webcam (web camera) that functions like CCTV which can be monitored via a web browser, magnetic switch as security detector, keypad as access control to turn off security monitoring system for 10 seconds, and the buzzer and LED as security indicators. When someone enter the house, he/she must press the keypad. If keypad input is correct according to the passcode then the LED will turn off, indicate that home security monitoring system off for 10 seconds. If he/she enter the house without pressing the keypad according to the passcode then when the door opens, a switch magnetic will active, then buzzer will sound and the indicator on the web will change, indicate that he/she is a person who will do the crime.Keyword : raspberry pi b+, webcam, magnetic switch, keypad, buzzer and LED. ReferencesAndre. 2014. Sejarah PHP dan Perkembangan Versi PHP. http://www.duniailkom.com/sejarah-php-dan-perkembangan-versi-php.Apache Software Foundation. About the Apache HTTP Server Project. http://httpd.apache.org/ABOUT_APACHE.html.Arfa. 2014. Akses Kontrol Kendaraan Bermotor Roda Empat Menggunakan Password dan Sensor. Skripsi. Jakarta: STMIK Raharja.Aziz, Abdul. 2012. Pengertian, Fungsi, Serta Cara Kerja Web Server. http://www.dedeerik.com/pengertian-fungsi-serta-cara-kerja-web-server.Baharudin, M. 2011. Pengertian Website. http://www.naevaweb.com/pengertian-website/arsip.html.Cox, Tim. 2014. Raspberry Pi Cookbook. Birmingham: Packt Publishing.Embedded Linux Wiki. Raspberry Pi, Low-level Peripherals. http://elinux.org/RPi_Low- level_peripherals.Embededdlinux. Raspberry Mode B-Block diagram. Diunduh http://embeddelinux01.com.Faizal. 2011. Prinsip Kerja Piezoelectric. http://www.insinyoer.com/prinsip-kerja-piezoelectric.Friedl, Stave. 2015. Secure Linux/Unix Access With Putty and Open SSH. http://unixwiz.net/techtips/putty-openssh.html/2015.Gudang Linux. 2011. Python. http://gudanglinux.com/glossary/python.Gurevich, Vladimir. 2011. Electric Relays: Principles and Applications. London: CRC Press.Harian Android. 2014. Pengertian dan Fungsi SD Card. http://www.harianandroid.com/2014/04/pengertian-dan-fungsi-sd-card.html.Heranudin. 2011. Rancang Bangun Sistem Keamanan Ruangan Menggunakan Radio Frequency. Skripsi. Depok: FT UI.Iswan, Agusta. 2012. Sistem Proteksi Brankas Berpassword Menggunakan Magnetic Doorlock sebagai Penggerak Doorstrike Berbasis Mikrokontroller. Tugas Akhir D3 Teknik Elektro. Semarang: FT UNNES.Kho, Dickson. 2012. Dioda dan Fungsi Dioda. http://teknikelektronika.com/-dioda-fungsi-dioda.Kho, Dickson. 2012. Pengertian LED (Light Emitting Diode) dan Cara Kerjanya. http://teknikelektronika.com/pengertian-led-light-emitting-diode-cara-kerja.Kho, Dickson. Pengertian Resistor dan Jenis Resistor. http://teknikelektronika.com/pengertian-resistor-jenis-jenis-resistor.Komponen Elektronika. 2011. Rangkaian Buzzer. http://komponenelektronika.com/rangkaian- buzzer.html.MS-1 Magnetic Door Switch datasheet. http://www.braude.ac.il/files/departments/electrical_electronic_engineering/labs/data_pages/p3.pdfNasih, Muhammad Usman. 2013. Alat Pengaman Kendaraan Bermotor Menggunakan Password dan SMS. Tugas Akhir. Yogyakarta: STMIK El Rahma.Özcan, Yakut. 2014. Piezoelektrik.Paul Malvino, Albert. 2010. Prinsip-Prinsip Elektronika. Jakarta: Erlangga.Pemrograman Komputer. 2012. Petunjuk Praktikum Pemrograman Komputer. Semarang: D3 Teknik Elektro UNDIP.Prayitno, Indra. 2010. Kupas Tuntas Malwar. Jakarta: Elex Media Komputindo.Raspberry Pi Fondation. GPIO Raspberry Pi Model A dan B. https://www.raspberrypi.org/documentation/usage/gpio/2009Raspberry Pi Fondation. Setting Up And Apache Web Server On A Raspberry Pi. https://www.raspberrypi.org/documentation/remote-access/web-server/apache.md.Raspberrry Pi Fondation. SSH Using Windows. http://raspberrypi.org/documentation/remote-access/ssh/windows.md/2014Richardson, Matt dan Shawn Wallace. 2015. Make: Getting Started with Raspberry Pi. Sebastopol: Maker Media.Robinson, Andrew dan Mike Cook. 2014. Raspberry Pi Projects. Chichester: John Wiley & Sons Ltd.Rohiman, Ao. 2011. Pengertian dan cara kerja router.http://www.catatanteknisi.com/2011/05/pengertian-cara-kerja-router.html.Sidik, Betha. 2011. Javascript. Jakarta: Informatika.Wahyu. Pengertian Webcam dan Fungsinya. http://wahyu.blog.fisip.uns.ac.id/2011/12/06/pengertian-web-cam-dan-fungsinya.Wikipedia. Secure Digital. https://en.wikipedia.org/wiki/Secure_Digital#Micro. 
RANCANG BANGUN SISTEM MONITORING KETINGGIAN AIR DAN KELEMBABAN TANAH PADA PENYIRAM TANAMAN OTOMATIS DENGAN HMI (HUMAN MACHINE INTERFACE) BERBASIS RASPBERRY PI MENGGUNAKAN SOFTWARE NODE-RED Wiguna, Esa Hayyu; Subari, Arkhan
Gema Teknologi Vol 19, No 3 (2017): April 2017 - October 2017
Publisher : Vocational School Diponegoro University

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Abstract

Esa Hayyu Wiguna, Arkhan Subari, in this paper explain that the monitoring system is a system used to monitor and control work processes in a plant design. This system is widely used and applied in the industrial world to find out the performance of a plant. To do the monitoring system, a lot of software can be used, which is then called the HMI (Human Machine Interface). The monitoring system with an interface in the form of HMI can be presented in various forms, such as buttons, or can also be displayed in the visualization of the plant while working. This monitoring system through an HMI interface uses supporting hardware in the form of a Raspberry Pi as a device to process the data that will be displayed on the display screen, while displaying its visualization uses an LCD touch screen. This LCD touch screen is connected to the Raspberry Pi via the LCD driver. The graphic form that will be displayed on the LCD touch screen is designed using Node-RED software. The visualization that will be displayed on the Touch Screen LCD will be adjusted to the working system of automatic plant sprinklers. This monitoring system using an HMI interface can display the plant's working system through indicators of water level and soil moisture. To test tube 2 water level measured through ultrasonic sensors through HMI has an error ratio of 1.01%, while for soil moisture measured through soil moisture sensors has an error ratio of 1.51%.