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INDONESIA
GEMA TEKNOLOGI
Published by Universitas Diponegoro
ISSN : 08520232     EISSN : 2656582X     DOI : -
Core Subject : Science,
Computer Science & IT
Gema Teknologi Journal (pISSN : 0852-0232, eISSN : 2656-582X) is an open access journal published by Vocational School, Diponegoro University, Indonesia. Gema Teknologi publishes articles from various engineering disciplines (the results of original scientific research or new scientific studies of literature). Editor receives articles both in English and Indonesian. Gema Teknologi Journal is published 2 (two) times a year, on April and October.
Arjuna Subject : -
Articles 166 Documents
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DUMMY CB SEBAGAI ALAT SIMULATOR KUBIKEL UNTUK PEMELIHARAAN PREVENTIF DAN KOREKTIF GUNA MENGURANGI FREKUENSI PADAM PENYULANG 20 KV (APLIKASI PADA SISTEM SCADA 20 KV PT.PLN (PERSERO) APD JATENG & DIY) Primanto, Meira Dwi; Sasmoko, Priyo
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.104 KB) | DOI: 10.14710/gt.v18i1.8811

Abstract

Meira Dwi Primanto, Priyo Sasmoko, in paper dummy CB as cubicle simulator for preventive and corrective maintenance to reduce off frequency 20 KV feeders (20 KV scada system at APD Central Java and Yogyakarta) explain that in 2013, the APD PT.PLN Central Java and Yogyakarta are conducting integration to SCADA at 20 KV feeders in distribution substation. For the next stage has been installed SCADA maintenance should be done periodically. Maintenance can be planned or due to interference with the SCADA system. Maintenance is usually done by the team must perform SCADA Distribution feeder outages and transfer of the load. In the installation of equipment, SCADA team should get a working permit to shut down the feeder, and to transfer the load to another feeder, so that the work has to get permission. SCADA systems are already installed requires maintenance to keep the system reliability. When maintenance SCADA, feeders should be extinguished, whereas for medium voltage customers such as factories, hospitals, and airports should always be channeled electrical energy. Feeder outages and load Delegation KWH lost causes. To the authors attempt to provide solutions that can overcome the missing KWH with a tool innovations made. The author makes a tool such as a dummy circuit breaker simulator 20 KV cubicles. This tool serves Especially when employees perform maintenance or investigation SCADA Disorders, which aims for 20 KV feeders should not be extinguished when performing preventive and corrective maintenance. So the number of frequency of feeder outages can be reduced. Keywords : Dummy Circuit Breaker, 20 KV PMT, SCADA maintenance.
STANDART PELAYANAN MINIMAL (SPM) DAN SISTEM LASING PADA KAPAL RO-RO UNTUK KESELAMATAN TRANSPORTASI PENYEBRANGAN LAUT (Studi Kasus KMP. LEGUNDI) Ariany, Zulfaidah; Hendra, A; Febriary, Samual
Gema Teknologi Vol 20, No 1 (2018): April 2018 - October 2018
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (431.71 KB) | DOI: 10.14710/gt.v20i1.21081

Abstract

Zulfaidah Ariany, A Hendra, Samual Febriary, in this paper explain that LEGUNDI is a Passanger Ship which has a Surabaya - Lombok shipping route capable of transporting passengers and vehicles in relatively large numbers. Research Minimum Service Standards (SPM) and Lasing System on Ro-Ro Ship for Marine Transportation Safety is aimed to know about Minimum Service Standards (SPM) and how to handle the Lasing system on Ro-Ro KMP LEGUNDY. The reference used is Minister of Transportation Regulation no 30 of 2016 regarding minimum service standard. The analysis used is simulation of shear load calculation on vehicle in Car Deck so get output layout of vehicle parking layout. The result of simulation of the calculation got the total load when the car shifted 35,5 KN then it can be suggested using breaking strength: 60 kN (6 ton) and Weight 0.35 kg based on Break Load Capacity Table for Chain Lasingbe typed in one paragraph and one-column format.
RISET APLIKASI KESELAMATAN KEBAKARAN DI KAPAL Ariany, Zulfaidah
Gema Teknologi Vol 16, No 2 (2011): October 2010 - April 2011
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (36.103 KB) | DOI: 10.14710/gt.v16i2.22133

Abstract

Zulfaidah Ariany, in this paper explain that fire ship at sea is a dangerous thing, both on the ship itself or on its passengers. Crew boat had put out the fire without the help of other collateral. Without a good extinguishing system will certainly result in damage to the ship and would endanger the safety of the soul crew and passenger ships.Ship fire safety research conducted by various parties including government organizations and non governmental organizations and academic institutions related to fire safety aspects of shipping and ship.The need for revision of regulations that have been enacted sail for this through the provision of research. Research conducted to gain understanding of the dangers that may occur on the ship, and a good method for controlling and extinguishing the fire. Research that was conducted earlier used as a basis in research notes or to come. Keywords : ship fire, fire safety
EKSTRAKSI ASAM LEMAK BEBAS DARI MINYAK NABATI DENGAN METANOL KAJIAN PERPINDAHAN MASSA Wahyuningsih Wahyuningsih; Moh Endy Yulianto
Gema Teknologi Vol 16, No 4 (2012): October 2011 - April 2012
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (137.118 KB) | DOI: 10.14710/gt.v16i4.4785

Abstract

Wahyuningsih, Moh Endy Yulianto, in this paper explain that extraction of free fatty acids from vegetable oils with methanol performed in batch stirred tank, in a variety of conditions. Variables experiments in liquid-liquid extraction including temperature, solvent ratio and rotational speed stirrer. This study aims to develop a correlation coefficient of mass transfer in extraction of free fatty acids from vegetable oils methanol. Rresearch was conducted in two phases. Was the first stage liquid-liquid extraction experiments in laboratory. Second step is the development of an empirical correlation for the mass transfer coefficients in the form of numbers not berdemensi results showed that the greater the temperature, turn the mixer speed and solvent-feed ratio of the mass transfer koffisien gained greater. Mass transfer coefficient expressed in Sherwood number and correlated against the Reynolds number, Schmitd, (dP / dT) and (L / S), the results obtained: Sh = 4,669 x 10-5 Re 0,462 Sc0,5 (dP/dT)0,308 (L/S)0,187 If used to calculate the mass transfer coefficients, have an average error of 8.79% for the regression line. This equation was developed in the Re number range 3169 to 11 750; numbers Sc 6321 to 9896, (dp / dT) from 0.0007 to 0.0013 and (L / S) of 0.333 to 1. Keywords: nabati oil extraction
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): April 2013 -October 2013
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.061 KB) | DOI: 10.14710/gt.v17i3.8928

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 .
ANALISA PERHITUNGAN BALLAST PADA PELUNCURAN MENYAMPING (SIDE LAUNCHING) KAPAL SUNGAI 200GT DI PT. DKB (PERSERO) CABANG SEMARANG Ariany, Zulfaidah
Gema Teknologi Vol 19, No 4 (2018): October 2017 - April 2018
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (655.29 KB) | DOI: 10.14710/gt.v19i4.19152

Abstract

Considering the risk faced in the side launching, limited land from the shipyard so that required calculation and analysis in the implementation of the launching. The purpose of this research is analyzes and counting ballast (a counterweight ) used in a river boat lct 200 GT on the launching of sideways ( side launching ) so that safe and floats can be perfect in water, as nown that the launching of is one of the stages important in the development process the new vessel which have prepared to be operated, formerly preceded by stage first cutting plate ( cutting first steel plate ) and the keel laying ( laying ) keel of a ship. Before the handover of a vessel is carried, a ship will had some sea trial. The results of this research is scientific publication in national journal , as a input for the shipyard to implement the launch sideways safe as well as the basis for students and teachers included in matter basic lecture subjects of case in point in lecture the theory ship building.
SISTEM DESELERASI KECEPATAN OTOMATIS PADA MOBIL BERDASARKAN JARAK MENGGUNAKAN SENSOR ULTRASONIK HC-SR04 BERBASIS ARDUINO MEGA 2560 Musthofa, Fikri; Winarno, Heru
Gema Teknologi Vol 18, No 3 (2015): April 2015 - October 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (626.607 KB) | DOI: 10.14710/gt.v18i3.21933

Abstract

Fikri Musthofa, Heru Winarno, in this paper explain that along with the high number of accidents on the highway at this time of course must be a special concern for motorists. There are many factors that underlie the occurrence of an accident in driving, the most important of which is the factor of driver error in driving, such as drowsiness or lack of rest, lack of concentration, and much more. Besides the security system in vehicles is also very influential in reducing the number of accidents in driving. With the development of today's technology, it is necessary to create a speed deceleration system on the motor based on the distance to the barrier objects in front of the vehicle using ultrasonic sensors. Ultrasonic sensor which is a type of proximity sensor is a sensor that can detect distances so that it can be used as a sensor in this system. This system can reduce motor speed automatically when the sensor detects a barrier object in front with a distance of less than 300 cm. This system will be active when the ultrasonic sensor detects a distance of less than 300 cm. At that distance the Arduino Mega 2560 will adjust the PWM value of the motor, the motor PWM value will decrease 12% every second so that within a period of 8 seconds the motor will have a speed of 0 rpm which means the motor will stop. This system is expected to reduce the number of road accidents due to motorists' faults. Keywords: Speed Deceleration, PWM Method, Ultrasonic Sensor, Arduino Mega 2650.ReferencesAgus Setya Abadi, Delta. 2008. Sensor Ultrasonic Sebagai Alat Navigasi Robot Pemadam Api.. Tugas Akhir PSD III Teknik Elektro (Tidak diterbitkan) Semarang : Universitas Diponegoro.Anonimus. 2012. Sensor Ultrasonic HC-SR04. Diunduh dari http://arduino- learning.com/code/hc-sr04-ultrasonic-sensor-example.php diakses pada 1 Juni 2015 pukul 14.30 WIB.Anonimus. 2013. Rangkaian Skematik Driver Motor L298N. Diunduh dari http://www.yujum.com/rangkaian-dan-skematik-driver-motor-l298n/ diakses pada 17 Juni 2015 pukul 19.45.Anonimus. 2014. Accumulator atau Aki dan jenisnya. Diunduh dari http://www.sandielektronik.com/2014/03/accumulator-atau-aki.html diakses pada 30 Mei 2015 pukul 16.15 WIB.Prayogo, Rudito. 2012. Pengaturan PWM dengan PLC. Tugas Mata Kuliah Teknik Otomasi (Tidak diterbitkan). Malang: Universitas Brawijaya.Riny Sulistyowati. 2012. Perancangan Prototype System Kontrol Dan Monitoring Pembatas Daya Listrik Berbasis Mikrokontroler. Surabaya : Institut Adhi Tama Surabaya.Surono. 1988. Tata Tulis Karya Ilmiah Bahasa Indonesia. Semarang : Fakultas Sastra Universitas Diponegoro.
STUDI EKONOMI RENOVASI PROPULSI KAPAL PATROLI “PARIKESIT” Ridwan, Mohd
Gema Teknologi Vol 16, No 3 (2011): April 2011 - October 2011
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (455.197 KB) | DOI: 10.14710/gt.v16i3.4709

Abstract

Mohd Ridwan, in this paper explain that new replacement main engine and propeller ship needs to be done with technical economic considerations. Main engine maintenance costs that have entered the age of 15 years improved each annualy, and fuel consumption increases. So that needs to be done renovations main engine by selecting the main engine in accordance with the propeller or propeller can also perform renovations. For this purpose needs the engineering and economic studies to decrease over 10% of the ship operational costs. Keywords : Main engine, Propeller, Operational costs
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): October 2012 - April 2013
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (543.576 KB) | DOI: 10.14710/gt.v17i2.8919

Abstract

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 person's 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
RANCANG BANGUN SIMULASI DISPLAY ARUS GANGGUAN RELAI PROTEKSI SEL 551 DI MASTER STATION PADA SCADA SURVALENT SEBAGAI UPAYA MEMPERBAIKI SAIDI Azhar, Dzulfikar Muhammad; Yuniarto, Yuniarto
Gema Teknologi Vol 18, No 2 (2015): October 2014 - April 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (293.686 KB) | DOI: 10.14710/gt.v18i2.8976

Abstract

Dzulfikar Muhammad Azhar, Yuniarto, in this paper explian that disruption of the power distribution network of 20 KV greatly influence the level of reliability of electric power system. Localize interference by means of network down one by one causing a long recovery time. As a result, SAIDI relatively high value. Protection Relays 551 SEL has a feature that can save the nominal fault current value last received. The value stored in the relay memory. Value of fault current can be processed into the distance nuisance. Thus, the fault current value can help officers to track the fault location based on distance. SCADA as a system that monitors and controls the electrical power system equipment remotely in real time on duty to display the current value of disturbance located at 551 SEL protection relays to be sent to the Control Center or the Master Station. Keywords : SCADA, fault current, relay protection 551 SEL

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