Peningkatan Kinerja Clustering Dokumen Teks Menggunakan Pembobotan Sampel

Algoritma clustering berbasis pembobotan sampel (sample weighting) saat ini banyak diteliti. Ada beberapa model pembobotan yang pada prinsipnya bertujuan untuk merubah nilai vektor sampel dan formula similaritas vektor sampel dengan pusat clusternya. Dalam dokumen teks pembobotan dapat berupa konektifitas antar dokumen, misalnya dalam dokumen akademik yang ada koneksi referensi. Namun dalam dokumen berita koneksi referensi mungkin jarang ditemukan. Dalam makalah ini teknik pembobotan baru diajukan, yaitu menggunakan kata-kata yang muncul dalam kata kunci (keyword) dan judul (title ) dari suatu dokumen teks. Eksperimen dilakukan terhadap abstrak dokumen akademik sebanyak 500 dokumen dan dokumen berita. Sebanyak 3000 dokumen Algoritma yang diuji kinerjanya adalah algoritma K-Means clustering dan algoritma Fuzzy C-Means clustering. Parameter kinerja algoritma digunakan nilai F-measure dari hasil clustering sebelum dilakukan pembobotan sampel dan setelah dilakukan pembobotan sampel. Hasil eksperimen menunjukkan bahwa pembobotan sampel dapat meningkatkan kinerja clustering sebesar 12,8% untuk pembobotan dengan keyword dan title dan meningkatkan kinerja clustering 9.8% untuk pembobotan dengan title saja

Perancangan dan Pembuatan Generator Fluks Radial Tiga Fasa Magnet Permanen Kecepatan Rendah

Based on wind speed data from Meteorology and Geophysics Agency, Indonesia has an average wind speed of about 3-6 m / s. Wind speed can be categorized at low wind speed. So the power station needs a low-speed generator. One solution found from this problem is the development of low speed power plant technology. The wind power plant has an important component of which is a generator which is an electric machine that convert mechanical energy into electrical power. By utilizing a low speed and high torque of the direct drive system of the wind turbine. In designing this low-speed generator the magnetic field is made of neodynium magnets. The generator is designed with a speed of 750 rpm, frequency 50 Hz, induced voltage 15 V and 3 phase. Permanent magnet used with a diameter of 20mm and 3mm thick. The tests included zero load testing, load testing, anchor resistance testing, short-circuit testing and calculating voltage regulation. At the load-bearing load and weightless testing there is a decrease in stress due to the load, where the voltage regulation at the R phase is 16.1%, the S phase is 16.8% and the T phase is 13.2%. The yielded generator voltage phase S is 10.1 Vac, voltage phase R is 10.2 Vac, and then voltage phase T is 10.3 Vac

Desain Pembangkit Listrik Tenaga Air Kapasitas 5 KW di Desa Siabu Kabupaten Kampar Riau

Power Plant Design Village Siabu water in Kampar, Riau based on the electrical energy needs of the villagers Siabu that there are not fulfilled. Design and Construction of Hydroelectric Power 5 kW capacity is located in the village of Siabu Regency, Riau Kampar by utilizing the flow of the river from the springs Siabu Bukit Barisan area. In this study, water discharge measurements using floating and height measurements falling water using water fitting. From measurements of water discharge and high falling water, is used to determine the design of hydroelectric plants that include pipe dimensions rapidly, kind of water turbines dimensional water turbine, and to determine the capacity of a synchronous generator 3 phase that corresponds to the design of hydropower generation capacity of 5 kW. The calculations show that the potential power that can be generated in Hydroelectric Power Plant in the Village this Siabu theoretically amounted to 5.432 kW to discharge water used by 0.4196 m3 / s and a height of fall of water (head nett) 3 meters. Of discharge water and high water fall is obtained rapidly design pipe with a length of 5 meters and a diameter of 0.3651 meters and turbine diameter dimensions of 30 cm by 163 cm width. From the calculation power of 5.432 kW aroused the 3 phase synchronous generator capacity that is used by 7 kVA

Analisa Simulasi Unjuk Kerja Filter Aktif Cascaded Multilevel Inverter untuk Mengurangi Efek Harmonisa Keluaran Hybrid Bidirectional Inverter 1500 Watt

Harmonics cause voltage distortion that can result in electrical equipment becomes hot quickly, the power factor is low, interference with the equipment that use relays for switching and measurement accuracy kWh-meter induction type will be reduced, therefore harmonics requires serious attention, to cope with a wave distorted would require a technology that has the function of fixing the waves, this technology is called filter. The use of filters to reduce harmonic been widely recommended to overcome these problems. This final project describes one harmonic filter configuration, that's called Active Filter parallel configuration, the method used is Cascaded Multilevel Inverter. The results of the simulation system design and form of the value of THD (Total Harmonic Distortion). THD value on systems that use an active filter Cascaded Multilevel Inverter showed a significant decrease compared to the system without the addition of a filter on Bidirectional Hybrid Inverter 1500 watts

Analisa dan Desain Maximum Power Point Tracking untuk Generator Induksi pada Aplikasi Sepeda Listrik

Currently, vehicle transportation is becoming a very important tool in helping humans. Therefore an increase in the volume of the vehicle is very high every year. With so many current vehicles could damage the air cleaner in nature, caused by the combustion of residual Fuel (Fuel oil) the vehicles that emit fumes. Therefore it needs an alternative environment-friendly vehicles with electric bicycles. Electric vehicles currently using permanent magnet motors as their motive. On this research the drivers of electric vehicles use the induction generator who has the advantages i.e. a constant round of and excitation does not need another motor as a driving force. This vehicle is also installed on a system power savings, power saving methods is improved significantly. One of them is MPPT (Maximum Power Point Tracking) used in induction generators. MPPT design is modelled using Matlab/Simulink software. The Matlab simulation has manage to obtain 55.04 volts of MPPT. While the generator output voltage without using the MPPT is amount of 40.84 volts. By using perturb and observe algorithm, it is possible to search the optimum power of generator

Desain Pengembangan Hybrid Bidirectional Inverter 1500 Watt dengan Menggabungkan Energi Alternatif Pembangkit Listrik Tenaga Surya dan Energi Utilitas untuk Aplikasi Rumah Tangga

Solar power plant ( SPP ) is an alternative energy which is currently undergoing development but the use of solar power utilization is not optimal due to the intensity of sunlight in Indonesia is only about 5 hours a day . To optimize the use of solar power is so in this paper will be discussed about the development of hybrid bidirectional inverter 1500 Watt design that combines alternative energy solar power plant ( SPP ) with the energy utilities. Hybrid bidirectional inverter can work both ways , namely as inveter and as a rectifier so as to make solar power as a primary energy and energy utilities as secondary energy . In this paper also discusses how much value the efficiency of electric power saving that can be given by this hybrid system in household applications

Desain dan Analisa Inverter Tiga Fasa dengan Metode SVPWM sebagai Penggerak Motor Induksi Tiga Fasa pada Aplikasi Sepeda Listrik

Along with the increased use of fuel oil, so that necessary to manufacture in producing electric vehicles. One of them the electric bike. On an electric bike, motors drive consist of electric motors, power converters and electronic controllers are the mover of electric vehicle systems. This study discusses the three-phase inverter method Space Vector Pulse Width Modulation (SVPWM) as a three-phase induction motor drive in electric bike applications that are modeled by using Matlab / Simulink.The purpose of this study is to get the design of the three-phase inverter SVPWM as a three-phase induction motor drive 500 W, 50 V, 50 Hz and 750 rpm. The inverter design using battery voltage 48 V. Before the battery voltage is converted by an inverter, battery voltage must first be raised through a boost converter to 70,62 Volt. Through simulation with Matlab software is then obtained curve of sinusoidal voltage box, current, and speed of the motor in the unit pu SVPWM controlled by the system. In this study also tested against changes in the value of the fundamental frequency inverter. From the test results that the inverter can set the speed of the motor at a frequency of 20 Hz to 50 Hz. At the time of the frequency inverter 5-15 Hz current increases exceeding motor nominal current of 8.25 A

Simulasi dan Deteksi Gangguan Belitan Stator Motor Induksi Tiga Fasa Menggunakan Arus Starting dengan Matlab/Simulink

Induction motors are electric motors are the most widely used in industry, therefore the performance, stability and efficiency of an induction motor is of considerable concern to anticipate disturbances that could lead to a decrease in the age of the induction motor. Motor Current Signature Analysis (MCSA) is one of the most common method used to detect the motor's performance on-line, but the use of this MCSA not give less good results when the load torque is not constant. Modeling the induction motor in a state of no interference derived from mathematical equations with the method of the reference frame stator (stationary reference frame). In this paper, interference with the stator winding is detected by a change in resistance and inductance then and the emergence of sideband frequencies / other at the starting stator current spectrum, then do the phase characteristic approach todiagnosis techniques Fast Fourier Transform (FFT). Analytical results from the use of such techniques show an increase the amount of energy in each frequency band and a large rangeTHD each interruption, so that the motor condition can be known whether normal or damage occurs.Keywords - induction motor, the stator windings, short circuit, Fast Fourier Transform, software matla

Desain dan Analisa Bidirectional Inverter untuk Menggerakkan Motor Induksi Tiga Fasa dengan Sumber Baterai 48 V

The supply of fossil energy is already at a critical time. Renewable energy such as sunlight and others are expected to cope with the energy crisis. The existing renewable still in the form of direct voltage. In automobile applications stored in the battery, which is used as the energy of the induction motor. So that a bidirectional inverter is needed to convert that directional voltage to rotate the induction motor. This research purposes to design and analyze bidirectional inverter to supply three phase Induction motor 380 V with 48 V Battery as the source. In Inverter mode, motor is supplied by battery, after the voltage is increased by the transformer. While it charge the battery through motor rotation in rectifier mode, after the voltage is decreased by the transformer. The design simulation is done by matlab simulink. It shows the performance able to achieve tehe minimum requirement of design specificatio