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31,377 Article Results

CMOS ring oscillator delay cell performance: a comparative study

10.11591/ijece.v9i3.pp1757-1764
D. A. Hadi , A. Z. Jidin , N. Ab Wahab , Madiha Z. , Nurliyana Abd Mutalib , Siti Halma Johari , Suziana Ahmad , M. Nuzaimah
A common voltage-controlled oscillator (VCO) architecture used in the phase locked loop (PLL) is the ring oscillator (RO). RO consist of number of inverters cascaded together as the input of the first stage connected to the output of the last stage. It is important to design the RO to be work at desired frequency depend on application with low power consumption. This paper presents a review the performance evaluation of different delay cell topologies the implemented in the ring oscillator. The various topologies analyzed includes current starved delay cell, differential delay cell and current follower cell. Performance evaluation includes frequency range, frequency stability, phase noise and power consumption had been reviewed and comparison of different topologies has been discussed. It is observed that starved current delay cell have lower power consumption and the different of the frequency range is small as compared to other type of delay cell.
Volume: 9
Issue: 3
Page: 1757-1764
Publish at: 2019-06-01

An approximation delay between consecutive requests for congestion control in unicast CoAP-based group communication

10.11591/ijece.v9i3.pp1997-2005
Chanwit Suwannapong , Chatchai Khunboa
This research presents a way to avoid network congestion during unicast CoAP-based group communication using increased delays between consecutive requests (DCR) in LoWPAN border routers to limit request send rates. It also provides a way to determine DCR values that are suitable for various network group sizes with differing node counts. The optimal DCR is obtained using the least squares approximation method and the relative minimum. Results from experimentation shows a positive relation, that is, an increase in group size necessitates an increase in DCR value. Experiments in various group sizes show favorable network performance and support the proposed congestion control method using DCR.
Volume: 9
Issue: 3
Page: 1997-2005
Publish at: 2019-06-01

Capacitive power transfer in biomedical implantable device: a review

10.11591/ijpeds.v10.i2.pp935-942
Muhammad Zaki bin Mustapa , Shakir Saat , Yusmarnita Yusof , Muslimah Meor Shaari
This paper presents the development of a new design method of capacitive power transfer (CPT) which is based on hybrid concept for Biomedical Implants. This method is able to improve various issues found in the widely used CPT system that is bipolar CPT method. Based on the ability of this purposed, the simulation of the CPT system has been designed to prove an amount of power transferred through a layer of tissue. The design used to validate the suggested model which to powering implanted device, and it was performed with 3cm square plates, which have a layer of beef with the 5mm thickness in between 2 coupling plate. Power signal was generated by Class E zero voltage switching. The Class E zero voltage switching has been designed to generating alternate current with the 1MHz frequency appropriate to the hybrid CPT system specification.
Volume: 10
Issue: 2
Page: 935-942
Publish at: 2019-06-01

Matlab/simulink simulation of unified power quality conditioner-battery energy storage system supplied by PV-wind hybrid using fuzzy logic controller

10.11591/ijece.v9i3.pp1479-1495
Amirullah Amirullah , Ontoseno Penangsang , Adi Soeprijanto
This paper presents performance analysis of Unified Power Quality Conditioner-Battery Energy Storage (UPQC-BES) system supplied by Photovoltaic (PV)-Wind Hybrid connected to three phase three wire (3P3W) of 380 volt (L-L) and 50 hertz distribution system. The performance of supply system is compared with two renewable energy (RE) sources i.e. PV and Wind, respectively. Fuzzy Logic Controller (FLC) is implemented to maintain DC voltage across the capacitor under disturbance scenarios of source and load as well as to compare the results with Proportional Intergral (PI) controller. There are six scenarios of disturbance i.e. (1) non-linear load (NL), (2) unbalance and nonlinear load (Unba-NL), (3) distortion supply and non-linear load (Dis-NL), (4) sag and non-linear load (Sag-NL), (5) swell and non-linear load (Swell-NL), and (6) interruption and non-linear load (Inter-NL). In disturbance scenario 1 to 5, implementation of FLC on UPQC-BES system supplied by three RE sources is able to obtain average THD of load voltage/source current slightly better than PI. Furthermore under scenario 6, FLC applied on UPQC-BES system supplied by three RE sources gives significantly better result of average THD of load voltage/source current than PI. This research is simulated using Matlab/Simulink.
Volume: 9
Issue: 3
Page: 1479-1495
Publish at: 2019-06-01

Experiment study investigation compare temperature series circuit and the parallel circuit of thermoelectric and variable water, electrical of thermoelectric for heat exchanger

10.11591/ijpeds.v10.i2.pp785-791
Akawit Yaidee , Chantana Punlek , Somchai Maneewan
This paper presents the comparison temperature of thermoelectric (Tec1-12708) between the series circuit and parallel circuit by adjusting of water flow rate pump and electrical supplying to thermoelectric, The electrical voltage at 8,10 and 12 V, water flow rate in reservoir was 0.015 kg/s and 0.025 kg/s. Experiments perform were 6 hours. The result from the researches, thermoelectric with parallel circuit high temperature more than thermoelectric with series circuit. The parallel circuit of thermoelectric can work better than the series circuit in hot side. The different temperature hot side of parallel circuit with the electrical voltage at 8, 10 and 12 V water flow rate in reservoir was 0.015 kg/s temperature average is 22.44 oC, 22.90 oC, 29.86 oC, and water flow rate in reservoir was 0.025 kg/s temperature average is 20.67 oC, 26.66 oC, 27.69 oC. Thermoelectric with parallel circuit makes the higher temperature more than thermoelectric with series circuit about 33%, 37%, 44% water flow rate in reservoir was 0.015 kg/s and 30%, 40%, 41% water flow rate in reservoir was 0.025 kg/s.
Volume: 10
Issue: 2
Page: 785-791
Publish at: 2019-06-01

Crosstalk in misaligned free space optical interconnects: modelling and simulation

10.11591/ijece.v9i3.pp1620-1629
Nedal Al-Ababneh
We introduce convenient model and an optimization scheme to optimize the signal-to-crosstalk ratio (SCR) in a free space optical interconnects (FSOIs) system that uses microlenses with finite circular apertures. In this model, we consider both the stray light crosstalk and the crosstalk due to the diffraction at the microlens apertures to evaluate the SCR. Using cylindrical form of Collins diffraction integral and the Laguerre–Gaussian (LG) beam model, we derive an approximate closed form formula for the optical field of a multimode LG beam propagating through circular apertured FSOIs by expanding the hard edge circular aperture function of the microlens in terms of complex Gaussian functions. The analyses indicate that the size of the detector is an important factor to optimize the SCR for both the apertured and the unapertured misaligned FSOIs system. The effect of higher order mode of the laser source on the SCR is also considered. 
Volume: 9
Issue: 3
Page: 1620-1629
Publish at: 2019-06-01

Relevance vector machine based fault classification in wind energy conversion system

10.11591/ijece.v9i3.pp1506-1513
Rekha S. N. , P. Aruna Jeyanthy , D. Devaraj
This Paper is an attempt to develop the multiclass classification in the Benchmark fault model applied on wind energy conversion system using the relevance vector machine (RVM). The RVM could apply a structural risk minimization by introducing a proper kernel for training and testing. The Gaussian Kernel is used for this purpose. The classification of sensor, process and actuators faults are observed and classified in the implementation. Training different fault condition and testing is carried out using the RVM implementation carried out using Matlab on the Wind Energy Conversion System (WECS). The training time becomes important while the training is carried out in a bigger WECS, and the hardware feasibility is prime while the testing is carried out on an online fault detection scenario. Matlab based implementation is carried out on the benchmark model for the fault detection in the WECS. The results are compared with the previously implemented fault detection technique and found to be performing better in terms of training time and hardware feasibility.
Volume: 9
Issue: 3
Page: 1506-1513
Publish at: 2019-06-01

An analysis of energy saving through delamping method

10.11591/ijece.v9i3.pp1569-1575
Mohd Firdaus Mohd Ab Halim , Muhamad Faizal Yaakub , Mohamad Haniff Harun , Khalil Azha Mohd Annuar , Farriz Hj Md Basar , Mohd Nazri Omar
Electrical energy consumption is one of the focus areas in Green and Sustainable technology in the 21st century. Many energy consultants offers services to reduce the electricity consumption to the commercial consumer. Many proposals are focusing on selling their energy management system product which cost a lot of initial investment. The problem of applying energy management system is that the building needs major renovation. In this paper, electricity consumption is reduced through delamping method. The delamping is strategizing based on energy efficiency audit. This technique complies with the ASHRAE international standard for office building. The number of light reduced and electricity consumption from this exercise can translate into reduction of maintenance and electricity bill. The comparison of payback period for various energy saving techniques were discussed as well.
Volume: 9
Issue: 3
Page: 1569-1575
Publish at: 2019-06-01

Development of an inexpensive data logger for solar water heating system regulators

10.11591/ijpeds.v10.i2.pp753-767
Ait ahmed Wassima , Aggour Mohammed , Ouhammou Badr
Each solar thermal plant can provide different parameters to be treated and evaluated, mostly temperature measurements, pressure specifications, heat transfer values. This data collection can be quite expensive taking into account the important number of sensors and data loggers and their specifications. Hence to assure flexibility in the data collection at a low cost, many hardware and software specifications can be adopted. Here we built an inexpensive data logger based on the Arduino board and IDE to collect and store incoming data from Resol DeltaSol regulators integrated in different solar water heating systems. The objective of this study is to allow massive synchronized measurements with high resolution to be stored into an SD card through the Arduino platform. The measurements are given by multiple sensors (temperature, pump speed, relay states) connected to the regulator. The results from the tests of the plant connected to the data logger are provided later on, alongside the commercial aspects of the built data logging device. After a month of daily measurements, the data logger showed an outstanding performance with an extreme low cost compared to industrial datalogger. 
Volume: 10
Issue: 2
Page: 753-767
Publish at: 2019-06-01

A five-level multilevel topology utilizing multicarrier modulation technique

10.11591/ijpeds.v10.i2.pp868-873
Rabiya Rasheed , Saju K K , Bindu V
This paper presents a new topology for cascaded H-bridge multilevel inverter utilizing multicarrier modulation technique. The new five-level topology utilizes a capacitive divider network consisting of two capacitors for producing output voltage levels. The developed circuit has reduced number of switches and dc sources compared to conventional five level inverters. Five main power switches, a single additional diode apart from antiparallel diodes, two capacitors and a dc supply constitute a single five level unit. Simulations as well as experimental results are verified for the new topology utilising multicarrier modulation technique with reduced harmonic distortions in the output.
Volume: 10
Issue: 2
Page: 868-873
Publish at: 2019-06-01

An adaptable different-levels cascaded h-bridge inverter analysis for PV grid-connected systems

10.11591/ijpeds.v10.i2.pp831-841
Adnan Hussein Ali , Hassan Salman Hamad , Ali Abdulwahhab Abdulrazzaq
Multi-level inverters (MLIs), have gained popularity in the last few years as a result of their low total harmonic distortions (THD) as well as their output waveform which is of high quality. The converter which considers more appropriate for applications of photovoltaic (PV)beyond the varying MLIs arrangementsis the Cascaded H-Bridge-(CHB) (MLI), meanwhile each PV panel may be served as an independent DC supply for any CHB unit. Through the use of MATLAB/Simulink, the efficiency of symmetrical single phase MLI in terms of the number of switches, harmonic content in addition to the stresses of voltage through theswitches that exist at photovoltaic cell by means of input source is enhanced; varying parameters like output current, voltage and power, and THD at 5-level 7-level and 9-level Cascaded MLI are observed. In this paper, attention is paid to a multi-level topologies which is flexible and based on cascaded MLI intended for PV grids connected system. An observation of the output voltage becomes closer to the sine wave as the levels increase, while the increase in the levels of Cascaded Multilevel Inverter causes the total harmonic distortion to decrease.
Volume: 10
Issue: 2
Page: 831-841
Publish at: 2019-06-01

Study and simulation with VHDL-AMS of the electrical impedance of a piezoelectric ultrasonic transducer

10.11591/ijpeds.v10.i2.pp1064-1071
Toufik Merdjana , Abdelhafid Chaabi
Ultrasonic transducers are a key element that governs the performances of both generating and receiving ultrasound in an ultrasonic measurement system. Electrical impedance is a parameter sensitive to the environment of the transducer; it contains information about the transducer but also on the medium in which it is immersed. Several practical applications exploit this property. For this study, the model is implemented with the VHDL-AMS behavioral language. The simulations approaches presented in this work are based on the electrical Redwood model and its parameters are deduced from the transducer electroacoustic characteristics.
Volume: 10
Issue: 2
Page: 1064-1071
Publish at: 2019-06-01

Adaptive real time traffic prediction using deep neural networks

10.11591/ijai.v8.i2.pp107-119
Parinith R Iyer , Shrutheesh Raman Iyer , Raghavendran Ramesh , Anala M R , K.N. Subramanya
The ever-increasing sale of vehicles and the steady increase in population density in metropolitan cities have raised many growing concerns, most importantly commute time, air and noise pollution levels. Traffic congestion can be alleviated by opting adaptive traffic light systems, instead of fixedtime traffic signals. In this paper, a system is proposed which can detect, classify and count vehicles passing through any traffic junction using a single camera (as opposed to multi-sensor approaches). The detection and classification are done using SSD Neural Network object detection algorithm. The count of each class (2-wheelers, cars, trucks, buses etc.) is used to predict the signal green-time for the next cycle. The model selfadjusts every cycle by utilizing weighted moving averages. This system works well because the change in the density of traffic on any given road is gradual, spanning multiple traffic stops throughout the day.
Volume: 8
Issue: 2
Page: 107-119
Publish at: 2019-06-01

Identification information sensors of robot systems

10.11591/ijeecs.v14.i3.pp1235-1243
Igor Parkhomey , Juliy Boiko , Oleksander Eromenko
At the present time, the complexity of identification is to find such a description, in which the image (information) of each class would have identified similar properties. The task is to make the transformed description includes the whole set of input images, united by the similarity class by the given ratio.Using the ordinates of an autocorrelation function is an inseparable shift in the center of gravity of an image, which leads to a change of such description.Nicest, the concept of an invariant description of information arises, this is an autocorrelation function, which is invariant to the description of any displacements of the image in the vertical and horizontal directions.The problem of finding an optimal decision rule arises, which, in a number of cases, can be constructed on the basis of a method, based on the definition of the maximum incomplete coefficient of similarity.Using this method, the solutions, that are almost unintelligible to the errors that arise due to the effects of interference, are found. Therefore, in increments k, this rule passes into the Bayes’ rule.
Volume: 14
Issue: 3
Page: 1235-1243
Publish at: 2019-06-01

Design and analysis of 2-coil wireless power transfer (WPT) using magnetic coupling technique

10.11591/ijpeds.v10.i2.pp611-616
A. Ali , M.N.M Yasin , M.F.C. Husin , N.A.M Ahmad Hambali
2-coil non-radiative wireless power transfer (WPT) is studied to find the coil diameter ratio to effective distance of power transfer efficiency (PTE). Single circular coil and spiral coil are designed and simulated using CST software to compare the result of coil diameter versus effective distance of PTE by using S21 value. Accordingly, the quality factor (Q) of both coils are presented as Q factor is one of the parameter that affect the performance of WPT system. The result is promising as the effective distance is more than the coil diameter with (PTE) more than 50% using spiral coil as compare to single coil design.
Volume: 10
Issue: 2
Page: 611-616
Publish at: 2019-06-01
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