Jurnal Teknologi

Abstract

Speed bump or in Indonesian language called “Polisi Tidur”, is considered less useful and disturbing for motorcyclists to reduce the speed of their motorbikes. An idea arose to design a device, which in its application could be utilized as a power plant with a generator driving sourced from a speed bump. By using a power electronics circuit as a regulator of the output produced. The research method of this tool is that when a vehicle passes a speed bump it will step on a bump that can move up and down, then the movement of the rise and fall of the bump is converted into a circular motion generator. The voltage generated from the generator is stored in the accumulator which will be used as electrical energy as needed. The purpose of this research is to be able to become a source of renewable alternative energy as a producer of electricity, to be able to utilize wasted energy into potential energy.

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Abstract

Indonesia sedang giatnya mengembangkan potensi energi terbarukan sebagai pengganti cadangan energi fosil yang menipis. Energi angin merupakan energi yang bersih tanpa mencemari lingkungan. Energi angin di Indonesia sangat berpotensi besar, tetapi masih kurang maksimal untuk pemanfaatannya. Salah satu bentuk energi alternatif yang dapat dimanfaatkan sebagai energi mekanik oleh turbin angin untuk mengubah menjadi energi listrik oleh generator dc. Ventilator yang beroperasi selama 24 jam berfungsi mengisap udara dan, terletak diatap gudang, gedung olahraga.. Pemanfaatan angin agar menjadi energi listrik, dirancang dari penggunaan turbin ventilator sebagai media pengubah angin menjadi energi gerak, dimana pergerakan turbin diteruskan oleh perbandingan pulley dan v-belt ke generator, generator inilah yang menghasilkan energi listrik. Penelitian ini menguji seberapa besar energi listrik yang dihasilkan pada perbedaan kecepatan angin mulai dari 3 hingga 5,4 m/s. Dari pengujian yang dilakukan, putaran generator, dan tegangan terendah terdapat pada kecepatan angin 3 m/s yaitu sebesar 3,6 V. sedangkan putaran generator, dan tegangan yang tertinggi didapatkan jika kecepatan angin adalah 5,4 m/s yaitu sebesar 10,3 V. 

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Abstract

Pada makalah ini, dipaparkan mengenai pengolahan citra digital menggunakan pendekatan Analisa Komponen Utama dan Algoritma Viola Jones sebagai pendeteksi wajah. Banyak citra yang dilatih pada penelitian ini yaitu 1500 citra wajah. Citra tersebut terdiri atas 100 individu (17 wanita dan 83 pria) dimana masing-masing individu memiliki 15 citra wajah. Selain itu, terdapat total citra yang diujikan sebanyak 500 citra wajah dimana jumlah citra tersebut dibagi oleh 100 individu sehingga masing-masing individu memiliki citra yang dilatih sebanyak 5 citra. Metode yang digunakan yaitu citra wajah dideteksi dengan algoritma Viola-Jones kemudian nilai Eigenface citra latih dibandingkan dengan citra uji menggunakan Eulidean Distance. Hasil yang diperoleh yaitu tingkat akurasi identifikasi citra wajah mencapai 89.2%, ketika citra latih berjumlah 100 citra dan latar belakang citra wajah tidak dieliminasi. Namun ketika latar belakang citra wajah dieliminasi, tingkat akurasi identifikasi meningkat menjadi 98.6%. Lain halnya jika citra latih berjumlah 1500 tingkat akurasi identifikasi citra wajah meningkat menjadi 100%.

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Abstract

A natural phenomenon such as Lightning that occurs when the upper atmosphere is unstable due to the convergence of a column of warm vertical air, with a cooler mass of air above which is heated by the sun, this rising air current carries water vapor which, while filling cold air , usually condenses, causing convective storm activity, this lightning can be one of the natural causes of injury to humans or damage to electrical equipment. In planning the installation of lightning rods in the Bima Sakti IST Akprind Yogyakarta campus building using KURN R80 type with electrostatic lightning rods. For the cable carrying from the end to the control tub using the NYA cable while for grounding cable using BC cable that is connected to the ground root with a type of ground root stem which has a length of 1.5 m and a diameter of 1.5 cm. From the results of the soil resistance test, get a calculated result of 4,95 Ω, and calculated using a measuring instrument to get a result of 1.16 Ω. With the nonconventional space method in IST Akprind Yogyakarta campus building 3, the total building height up to the 27 meter final is obtained 130.4 m strike distance and 52.46 ° protection angle with a 79.45 m protection radius.

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Abstract

The 4.0 industrial revolution, industry trends began to combine automation technology with cyber technology. For this reason, a security system is needed as a response to the growing development of this cyber technology. One of the security solutions in doing authentication is to use a part of the human body, the face. The system can detect face objects as input images from the camera. After the object is detected, the system will do a matching face with the face image contained in the system database. This system is using the application of Computer Vision in the security system. The image will be processed using the Haar Cascade method to detect facial objects contained in the image. The Eigenface method to compare detected faces with faces in the database. Both of these methods will be processed using Raspberry Pi. Three users test the system with different conditions. For users already registered in the database, the door lock will open automatically. The open door security system will reject users that are not stored in the database and send notifications via the Telegram and Whatsapp applications. The average accuracy of face recognition ranges from 80% – 90% with the distance of the camera as far as 0.45 m in a room with good light. Accuracy and response capabilities are greatly influenced by distance, camera specifications, angle, and light intensity

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Abstract

The background of the research is the need for 3 phase ac servoposition is needed to obtain a precise position, where the 3 phase ac motor with a power between 0.25 to 1 kw when used to make precise position movements, is quite difficult, because of the moment of inertia, when  silent governed the way the starting time process from zero speed to nominal speed is quite long, about 1 to 2 seconds, as well as when from normal rotation commanded to stop zero speed the process of stopping time ranges from 2 to 3 seconds, whereas we want starting  time 0.5 seconds and stop time 0.75 seconds stop right in the position ordered.  This problem is very disturbing in making other system controls, because the time is long enough in the starting time and stoping time, and this process will repeat every time according to the modulation of the control signal received by the motor switching system, while the operating time of the desired system is only 30 seconds  in following the target so as not to disappear in the camera shot, starting from the target start is obtained until the end of the process when turning on the firing button, as used in controlling the missile launcher.  The launcher’s processing time is only about a few minutes, for searching, locking and firing, otherwise the object to be locked will disappear from observation.

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