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29,905 Article Results

A review of combined economic emission dispatch for optimal power dispatch with renewable energy

10.11591/ijeecs.v16.i1.pp33-40
N. F. Aswan , M. N. Abdullah , A. H. Abu Bakar
This paper provides comprehensive review of recent formulation and solution of combined economic emission dispatch problem considering renewable energy. Generally, power dispatch plays an important role in power generation system that mainly depends on the fossil fuels. Rapid depletion of these sources cause a limitation and increase the fuel price. At the same time, the poisonous gases emit by the thermal generator causes a long term environmental pollution. An extensive researches have been conducted for last few decades by considering Renewable Energy (RE) in power generation system as an alternative source. Therefore, Combined Economic Emission Dispatch (CEED) of thermal and renewable energy resources currently formulated in power dispatch problem. The optimization methods that commonly used to solve the CEED problem are categorized as traditional method, non-conventional method and hybrid method. It can be concluded that non-conventional and hybrid method have great and superior solution for solving multiobjective economic emission dispatch problem. The recent research related to CEED with RE are summarized in terms of methods, test cases, conditions, types of RE and constraints. Thus, it can be useful references for the research in this area.
Volume: 16
Issue: 1
Page: 33-40
Publish at: 2019-10-01

Fuzzy-logic-control of two-switch & three-switch-serial-input interleaved-forward-converters

10.11591/ijeecs.v16.i1.pp147-155
Lakshmi Ramalingam , K. Karunanithi , P. Chandrasekar
This manuscript manages F-L-C of “two-switch& three-switch-interleaved-forward- -converters” with DC-engine-load”. Numerous modern applications require DC-power. This forward-converter convert's unregulated DC-capacity to controlled DC-control. It contains high recurrence transformer which is additionally called ‘isolation-transformer’. This gives disconnection among load& fundamental-circuit. The AC- control is amended utilizing half-wave-rectifier. The swell in the yield is separated utilizing pi- filter. FLC is intended for two-switch and three-switch forward-converter-systems. The simulation is completed by utilizing MATLAB-simulink. The controller execution is considered for different estimations of load-torque for both two-switch& three-switch forward-converter -frameworks.
Volume: 16
Issue: 1
Page: 147-155
Publish at: 2019-10-01

Implementation of embedded real-time monitoring temperature and humidity system

10.11591/ijeecs.v16.i1.pp184-190
Firdaus Hashim , Roslina Mohamad , Murizah Kassim , Saiful Izwan Suliman , Nuzli Mohamad Anas , Ahmad Zaki Abu Bakar
Temperature and humidity are among the parameters that significant to the industrial and agricultural. Traditionally, these elements are monitored inefficiently through wired monitoring system that caused higher implementation and maintenance cost. In addition, the device to detect the temperature such thermometer is not suitable for real-time monitoring since it need a longer response time to measure. With the advent of wireless technology, the temperature and humidity are monitored remotely and effectively. This paper aims to describe the implementation of an embedded real-time temperature and humidity monitoring system, using Arduino for Internet of Things (IoT) application.  The system integrates the Arduino node with a dashboard system call Node-FRED, which interfaced to the LoRa radio through the Things Network gateway. This IoT application is deployed on both indoor and outdoor environment, to investigate the relation between the temperature and humidity level in order to manage the environment at more comfort level.
Volume: 16
Issue: 1
Page: 184-190
Publish at: 2019-10-01

Excellent luminous flux of WLEDs with flat dual-layer remote phosphor geometry

10.12928/telkomnika.v17i5.12111
Tran Thanh; Van Hien University Trang , Phan Xuan; National Key Labrolatory of Digital Control and System Engineering, Ho Chi Minh City, Vietnam Le , Nguyen Doan Quoc; Ton Duc Thang University, Ho Chi Minh City Anh
This paper focuses on the comparison of the luminous flux of two dual-remote phosphor structures named flat dual-remote phosphor (FDRP) and concave dual-remote phosphor (CDRP). These two configurations have different luminous flux values due to the disparity in scattering properties in white LEDs. However, the researched results showed that FDRP structure is more lucrative than the CDRP structure when it comes to the luminous flux effectiveness. To support the aforementioned idea, this article also presents the influence of the distance between two phosphor layers (d1) and the distance between the phosphor layer with the LED surface (d2) on the optical properties of the FDRP structure. Specifically, the scattering ability and absorption properties of the remote phosphor layer will vary sharply if d1 and d2 are adjusted into different values, which produces an immense impact on the chromatic homogeneity and illumination capability of WLEDs. Therefore, in order to stabilize the correlated color temperature (CCT) of WLEDs at 8500 K when there is a modification on d1 and d2, the concentration of YAG:Ce3+ phosphor also needs to be varied. Accordingly, the scattering process and absorption phenomenon in the remote phosphor layer will bottom out when d1 = d2 = 0,  leading to the worst color quality and luminous flux. The effect of the spectra generated as these distances are adjusted is obvious evidence for this point. In other words, the larger the d1 and d2, the larger the scattering surface, and thus the blending of blue and yellow light rays will become more homogeneous, yielding the smallest white light deflection and the lowest luminous flux at the same time. The paper's results indicated that the luminous flux will reach a peak at 1020 lm if d1 = 0.08 mm or d2 = 0.63 mm and the chromatic deflection will hit the lowest point as d1 = 0.64 mm or d2 = 1.35 mm. In the end, manufacturers can make their choice for the production of higher-standard WLEDs based on the general knowledge and helpful information that the article has provided and analyzed.
Volume: 17
Issue: 5
Page: 2527-2534
Publish at: 2019-10-01

Modified spiht algorithm for quincunx wavelet image coding

10.11591/ijeecs.v16.i1.pp230-242
Ismahane Benyahia , Abdesselam Bassou , Chems El Houda Allaoui , Mohammed Beladgham
In this paper, an image compression method based on the Quincunx algorithm coupled with the modified SPIHT encoder (called SPIHT-Z) is presented. The SPIHT-Z encoder (coupled with quincunx transform) provides better compression results compared with two other algorithms: conventional wavelet and quincunx both coupled with the SPIHT encoder. The obtained results, using the algorithm that applies (Quincunx with SPIHT-Z) are evaluated by image quality evaluation parameters (PSNR, MSSIM, and VIF). The compression results on twenty test images showed that the proposed algorithm achieved better levels of the image evaluation parameters at low bit rates.
Volume: 16
Issue: 1
Page: 230-242
Publish at: 2019-10-01

Analysis of an energy storage sizing for grid-connected photovoltaic system

10.11591/ijeecs.v16.i1.pp17-24
Aimie Nazmin Azmi , Norhafiz Salim , Aziah Khamis
This paper present on the analysis of an energy storage sizing for a small grid-connected PV system.  This project is to study the proper sizing of energy storage (battery) in a grid-connected PV system for consumers whom purchase and sell electricity from and to the utility grid. The goal is to minimize the total cost of the operation for a consumer with a PV system with a battery storage system. This is to make sure that minimizing the total annual operating cost while maintaining an efficient system. This study uses typical consumer load consumption, and solar irradiance data throughout a year, while varying the type of battery storage (study lead acid and Lithium ion battery) as an energy storage for a similar system. Since lithium ion is not the main options to be integrated with PV system, this study will then reveal the data in terms of cost on why it is not a popular choice.
Volume: 16
Issue: 1
Page: 17-24
Publish at: 2019-10-01

Electronics system thermal management optimization using finite element and Nelder-Mead method

10.12928/telkomnika.v17i5.12796
Nurul Kausar; Universiti Teknologi Malaysia Ab Majid , Fatimah Sham; Universiti Teknologi Malaysia Ismail
The demand for high-performance, smaller-sized, and multi-functional electronics component poses a great challenge to the thermal management issues in a printed circuit board (PCB) design. Moreover, this thermal problem can affect the lifespan, performance, and the reliability of the electronic system.  This project presents the simulation of an optimal thermal distribution for various samples of electronics components arrangement on PCB. The objectives are to find the optimum components arrangement with minimal heat dissipation and cover small PCB area. Nelder-Mead Optimization (NMO) with Finite Element method has been used to solve these multi-objective problems. The results show that with the proper arrangement of electronics components, the area of PCB has been reduced by 26% while the temperature of components is able to reduce up to 40%. Therefore, this study significantly benefits for the case of thermal management and performance improvement onto the electronic product and system.
Volume: 17
Issue: 5
Page: 2268-2275
Publish at: 2019-10-01

A voltage electrical distance application for power system load shedding considering the primary and secondary generator controls

10.11591/ijece.v9i5.pp3993-4002
Le Trong Nghia , Quyen Huy Anh , Phan Thi Thanh Binh , N Thai An , P. H. Hau
This paper proposes a method for determining location and calculating the minimum amount of power load needed to shed in order to recover the frequency back to the allowable range. Based on the consideration of the primary control of the turbine governor and the reserve power of the generators for secondary control, the minimum amount of load shedding was calculated in order to recover the frequency of the power system. Computation and analysis of the voltage electrical distance between the outage generator and the loads to prioritize distribution of the amount power load shedding at load bus positions. The nearer the load bus from the outage generator is, the higher the amount of load shedding will shed and vice versa. With this technique, a large amount of load shedding could be avoided, hence, saved from economic losses, and customer service interruption. The effectiveness of the proposed method tested on the IEEE 37 bus 9 generators power system standard has demonstrated the effectiveness of this method.
Volume: 9
Issue: 5
Page: 3993-4002
Publish at: 2019-10-01

Stochastic fractal search based method for economic load dispatch

10.12928/telkomnika.v17i5.12539
Ly Huu; Ton Duc Thang university Pham , Thang Trung; Ton Duc Thang university Nguyen , Lam Duc; Nguyen Tat Thanh University Pham , Nam Hoang; Ton Duc Thang University Nguyen
This paper presents a nature-inspired meta-heuristic, called a stochastic fractal search based method (SFS) for coping with complex economic load dispatch (ELD) problem. Two SFS methods are introduced in the paper by employing two different random walk generators for diffusion process in which SFS with Gaussian random walk is called SFS-Gauss and SFS with Levy Flight random walk is called SFS-Levy. The performance of the two applied methods is investigated comparing results obtained from three test system. These systems with 6, 10, and 20 units with different objective function forms and different constraints are inspected. Numerical result comparison can confirm that the applied approach has better solution quality and fast convergence time when compared with some recently published standard, modified, and hybrid methods. This elucidates that the two SFS methods are very favorable for solving the ELD problem.
Volume: 17
Issue: 5
Page: 2535-2546
Publish at: 2019-10-01

A preliminary study on design of rehabilitation game for children with autism spectrum disorder

10.11591/ijeecs.v16.i1.pp524-529
Sara Reisi Dehkordi , Marina Ismail , Norizan Mat Diah
This research presented a preliminary study on designing a rehabilitation game for children with Autism Spectrum Disorder. It has been proved that children with Autism are not interested in attending traditional rehabilitation treatments. Existing researches have shown that games and their usage in the rehabilitation area are growing fast. However, there is less research used to design a rehabilitation game ensuring that the proposed design criteria are based on the preference and requirements of users in order to maximize the engagement rate of the game. In this research, one-month observation sessions were conducted with five autistic participants with no design expertise in order to collect essential design considerations for a rehabilitation game. This paper proposed design considerations, which can be helpful to design a rehabilitation game to promote user engagement by addressing game mechanics and behavioral techniques according to the result of our observations.
Volume: 16
Issue: 1
Page: 524-529
Publish at: 2019-10-01

A temperature characterization of (Si-FinFET) based on channel oxide thickness

10.12928/telkomnika.v17i5.11798
Yousif; University Malaysia Pahang (UMP) Atalla , Yasir; Ishik University Hashim , Abdul Nasir Abd; University Malaysia Pahang (UMP) Ghafar , Waheb A.; University Malaysia Pahang (UMP) Jabbar
This paper presents the temperature-gate oxide thickness characteristics of a fin field-effect transistor (FinFET) and discusses the possibility of using such a transistor as a temperature nano-sensor. The investigation of channel oxide thickness–based temperature characteristics is useful to optimized electrical and temperature characteristics of FinFET. Current–voltage characteristics with different temperatures and gate oxide thickness values (Tox = 1, 2, 3, 4, and 5 nm) are initially simulated, and the diode mode connection is considered to measure FinFET’s temperature sensitivity. Finding the best temperature sensitivity of FinFET is based on the largest change in current (∆I) within a working voltage range of 0–5 V. According to the results, the temperature sensitivity of FinFET increases linearly with oxide thickness within the range of 1–5 nm, furthermore, the threshold voltage and drain-induced barrier lowering increase with increasing oxide thickness. Also, the subthreshold swing (SS) is close to the ideal value at the minimum oxide thickness (1 nm) then increases and diverges with increasing oxide thickness. So, the best oxide thickness (nearest SS value to the ideal one) of FinFET under the conditions described in this research is 1 nm.
Volume: 17
Issue: 5
Page: 2475-2480
Publish at: 2019-10-01

A new technique to reduce overshoot in pneumatic positioning system

10.12928/telkomnika.v17i5.12807
Siti Fatimah; Universiti Teknikal Malaysia Melaka Sulaiman , M. F.; Universiti Teknologi Malaysia Rahmat , A. A. M.; Universiti Teknologi Malaysia Faudzi , Khairuddin; Universiti Teknikal Malaysia Melaka Osman
This paper presents a new approach for improving the performance of the pneumatic positioning system by incorporating a nonlinear gain function with observer system. System identification technique has been employed to represent the pneumatic system, while a model predictive control (MPC) with the observer system has been employed as the main controller to control the positioning of the system. The nonlinear gain function has been incorporated with the control strategy to compensate nonlinearities and uncertainties inherent in the parameters of the system. Unconstrained and constrained cases of control signals have been considered in this study. Simulation based on Matlab/Simulink indicated a reduction in overshoot of the system response for both cases due to additional nonlinear gain function in the strategy. Furthermore, remarkable enhancement was observed in effectiveness of this function while incorporated in constrained case, when this new strategy successfully improved the transient response in the pneumatic positioning system.
Volume: 17
Issue: 5
Page: 2607-2616
Publish at: 2019-10-01

Improving luminous flux and color homogeneity of dual-layer phosphor sctructure

10.12928/telkomnika.v17i5.11038
Tran Thanh; Ton Duc Thang University Trang , Phan Xuan; National Key Labrolatory of Digital Control and System Engineering Le , Nguyen Doan; Ton Duc Thang University Quoc Anh
In order to clarify the main purpose of the study, we put a green phosphor layer SrBaSiO4:Eu2+ on the yellow phosphorus layer YAG:Ce3+ through using only one WLEDs structure in different color temperatures like 5600 K, 6600 K, 7700K. Then, we find the suitable SrBaSiO4:Eu2+ concentration in order that the luminous flux could get the highest value. The results show that SrBaSiO4:Eu2+ brings great benefits to increase not only optical gain but also color uniformity. Specifically, the greater the SrBaSiO4:Eu2+ concentration, the greater the output of WLEDs because of the development of green light component in WLEDs. However, only if the SrBaSiO4:Eu2+ concentration exceeds the level, a slight decrease in color rendering index (CRI) can occur, which based on Monte Carlo simulation. In addition, the results of this paper have contributed significantly to the creation of higher-powered WLEDs.
Volume: 17
Issue: 5
Page: 2643-2649
Publish at: 2019-10-01

Breakdown on LDPE film due to partial discharge in air gap and its correlation with electrical properties and surface degradation

10.12928/telkomnika.v17i5.12245
Eka Putra; Andalas University Waldi , Yoshinobu; Toyohashi University of Technology Tempaku Murakami , Masayuki; Toyohashi University of Technology Tempaku Nagao
This paper describes the breakdown characteristic of the low density poly ethylene film caused by partial discharge in the air gap. The purpose of this paper is to clarify the effect number of discharge under repetition rectangular pulses with a needle-plane electrode system as a function of pulse frequency. The result performed, from 10 Hz up to 1000 Hz. From 10 Hz to 200 Hz, the pulse number up to breakdown did not change significantly with increasing the pulse frequency and the magnitude of partial discharge function of pulse number with varied frequency until breakdown were similar. By using both potential decay and surface degradation analysis function of number of pulse, the breakdown phenomena caused by partial discharge was shown to reveal a significant correlation between electrical properties and the transparency of its surface to change deposited on it by a partial discharge exposure.
Volume: 17
Issue: 5
Page: 2285-2291
Publish at: 2019-10-01

Gamification concept for encouraging lecture attendance

10.11591/ijeecs.v16.i1.pp482-490
Vinothini Kasinathan , Aida Mustapha , Chan Kok Fu , Mohamad Firdaus Che Abdul Rani , Sadesh Manikam
New generation of students has high dependence on technology and embrace social learning environments that have low barrier to access. This means in-class lectures are not popular anymore, and in fact has become a burden for them to cope. To resolve the issue of low student attendance, this paper proposes a character growth game with the concept of gamification in education that is able to track and reward student attendance called PetAttendToClass. PetAttendToClass is a client-based system developed using C# and unity3D game engine. Although finding from the UAT session revealed that some users believed that attendance is the responsibility of the student, gamification is meant to turn this mundane responsibility into something motivative, interactive and interesting. It is hoped that by gamifying the class attendance, student will be motivated to attend their daily classes.
Volume: 16
Issue: 1
Page: 482-490
Publish at: 2019-10-01
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