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31,456 Article Results

Analysis of HVDC breakdown characteristic of LLDPE-natural rubber added with biofiller as high voltage insulating material

10.11591/ijeecs.v20.i3.pp1203-1209
Nor Izzati Mohd Salleh , Nor Akmal Mohd Jamail , Nishanti Suntharasaka , Nor Shahida Mohd Jamail , Mohamad Farid Sies , Qamarul Ezani Kamarudin , Mohamed Afendi Mohamed Piah
The influence of solid insulation has been investigated by few researchers. The mechanism of solid breakdown is important in insulation studies. In this research, testing on linear low density polythylene (LLDPE) with natural rubber (NR) and different weight concentration of biofiller are conducted under high voltage direct voltage (HVDC) by using needle and sphere types of electrode arrangements. Oil palm empty fruit bunch (OPEFB) and pineapple leaf fiber (PALF) are the biofillers used for the samples development. The LLDPE-NR samples consists of different weight percentages of biofiller which are 0%, 2.5%. 5.0%. 7.5% and 10% with 3mm thickness. The voltage has been increased until the breakdown occurs. Based on the results obtained, OPEFB and PALF with the highest weight percentages of 10% showed the highest damage voltages of 59.09kV and 59.36kV. It has been proven that both samples with the highest filler content have appropriate insulating properties. In conclusion, the addition of biofiber to LLDPE-NR has improved the breakdown properties compared to pure LLDPE.
Volume: 20
Issue: 3
Page: 1203-1209
Publish at: 2020-12-01

Improved fuzzy c-means algorithm based on a novel mechanism for the formation of balanced clusters in WSNs

10.12928/telkomnika.v18i6.14716
Ali Abdul-hussian; Universiti Teknikal Malaysia Melaka Hassan , Wahidah Md; Universiti Teknikal Malaysia Melaka Shah , Abdul-hussien; University of Al-Zahraa for Women Hassan Habeb , Mohd Fairuz Iskandar; Universiti Teknikal Malaysia Melaka Othman
The clustering approach is considered as a vital method for many fields suchas machine learning, pattern recognition, image processing, information retrieval, data compression, computer graphics, and others.Similarly, it hasgreat significance in wireless sensor networks (WSNs) by organizing thesensor nodes into specific clusters. Consequently, saving energy and prolonging network lifetime, which is totally dependent on the sensor’s battery, that is considered asa major challenge in the WSNs. Fuzzyc-means (FCM) is one of classification algorithm, which is widely used in literature for this purpose in WSNs. However, according to the nature of random nodes deployment manner, on certain occasions, this situation forces this algorithm to produce unbalanced clusters, which adversely affects the lifetime of the network.To overcome this problem, a new clustering method called FCM-CMhas been proposed by improving the FCM algorithm to form balanced clustersfor random nodes deployment. The improvement is conductedby integrating the FCM with a centralized mechanism(CM).The proposed method will be evaluated based on four new parameters. Simulation result shows that our proposed algorithm is more superior to FCM by producing balanced clustersin addition to increasing the balancing of the intra-distances of the clusters, which leads to energy conservation and prolonging network lifespan.
Volume: 18
Issue: 6
Page: 2894-2902
Publish at: 2020-12-01

A survey on local binary pattern and gabor filter as texture descriptors of smart profiling systems

10.11591/ijeecs.v20.i3.pp1379-1387
Shihab Hamad Khaleefah , Salama A. Mostafa , Aida Mustapha , Noor Azah Samsudin , Mohammad Faidzul Nasrudin , Abdullah Baz
With the dramatic expansion of image information nowadays, image processing and computer visions are playing a significant role in terms of several applications such as image classification, image segmentation, pattern recognition, and image retrieval. One of the important features that have been used in many image applications is texture. The texture is the characteristic of a set of pixels that formed the image. Therefore, analyzing such texture would have a significant impact on segmenting the image or detecting important portions of such image. This paper aims to overview the feature extraction and description techniques depicted in the literature to characterize regions for images. In particular, two of popular descriptors will be examined including local binary pattern (LBP) and gabor filter. The key characteristic behind such investigation lies in how the features of an image would contribute toward the process of recognition and image classification. In this regard, an extensive discussion is provided on both LBP and Gabor descriptors along with the efforts that have been intended to combine them. The reason behind investigating these descriptors is that they are considered the most common local and global descriptors used in the literature. The overall aim of this survey is to show current trends on using, modifying and adapting these descriptors in the domain of image processing.
Volume: 20
Issue: 3
Page: 1379-1387
Publish at: 2020-12-01

Design and implementation of proposed 320 bit RC6-cascaded encryption/decryption cores on altera FPGA

10.11591/ijece.v10i6.pp6370-6379
Ashwaq T. Hashim , Ahmed M. Hasan , Hayder M. Abbas
This paper attempts to build up a simple, strong and secure cryptographic algorithm. The result of such an attempt is “RC6-Cascade” which is 320-bits RC6 like block cipher. The key can be any length up to 256 bytes. It is a secret-key block cipher with precise characteristics of RC6 algorithm using another overall structure design. In RC6-Cascade, cascading of F-functions will be used instead of rounds. Moreover, the paper investigates a hardware design to efficiently implement the proposed RC6-Cascade block cipher core on field programmable gate array (FPGA). An efficient compact iterative architecture will be designed for the F-function of the above algorithm. The goal is to design a more secure algorithm and present a very fast encryption core for low cost and small size applications.
Volume: 10
Issue: 6
Page: 6370-6379
Publish at: 2020-12-01

Mitigation of non-linear four-wave mixing phenomenon in a fully optical communication system

10.12928/telkomnika.v18i6.16136
Petr; University of Žilina Ivaniga , Tomáš; University of Technology Košice Ivaniga
This paper aims to point out the nonlinear phenomenon occurring in coarse/dense wavelength division multiplex (C/D-WDM) systems. This phenomenon has to betaken into account during the design of the optical network itself, as wavelengthsin the optical fiber are constantly densified. The paper points out the emergence of the non-linear four-wave mixing (FWM) phenomenonand how it relates to the dispersion in the optical fiber together with the transmit power. The output of the paper is a proposed design of the system that points to the improvement of the bit error rate (BER) with a suitable choice of dispersion and suitable transmission power.
Volume: 18
Issue: 6
Page: 2878-2885
Publish at: 2020-12-01

Irrational thoughts of the translator’s personality in assessing the quality of translation

10.11591/ijere.v9i4.20519
Jabbar Frayyeh Shraida , Muthana Hameed Khalaf
The correlation between translation as an objective field and psychological characteristics has produced various psychological and translational interrogations. To investigate the role of the translator’s personality in identifying the level of irrationality beliefs, university instructors are the corpus of the present study. After using statistical means SPSS, the results of instructors of males and females were observed to advocate for an active role of the translator in some instances. The present study employed a questionnaire that is consisted of thirty-five paragraphs measures the individual's attitude towards himself and his or her family that behaves irrationally in the performance and functions. Through the results of this study, which this study found that irrational thoughts are widespread among male and female teachers. This research also provided details of making an empirical contribution to the research in translation. Thus, the seriousness of irrational thoughts, as it is one of the reasons for the incompatibility and its seriousness on translation. This led to the weakness of the translation process, which caused the distraction of the mind to broadcast the hostile rumour that managed to exploit confusion in the translation.
Volume: 9
Issue: 4
Page: 1063-1070
Publish at: 2020-12-01

Modelling of solar micro gas turbine for parabolic dish based controller application

10.12928/telkomnika.v18i6.16676
Syariffah; Universiti Teknikal Malaysia Melaka Othman , Mohd Ruddin; Universiti Teknikal Malaysia Melaka Ab. Ghani , Zanariah; Universiti Teknikal Malaysia Melaka Jano , Tole; Universitas Ahmad Dahlan Sutikno
Dish-Stirling unit and photovoltaic panels are the premier technologies available to generate off-grid solar energy. The major issue for both systems is in terms of producing output power. Air-Brayton cycle was utilized asan engine by converting the thermal energy to electricity. Micro gas turbine (MGT) has been recognized as one of the viable alternatives compared to Stirling engines, where it represents a state-of-art parabolic dish engine specifically in turbine gas technology. Hence, the microgas turbine is a technology that is capable of controlling low carbon while providing electricity in off-grid regions. MGT uses any gas as its input like natural gas, bio gas and others. Micro gas turbine has advantages for its high expansion ratio and less moving components. Compared to competing for diesel generators, the electricity costs from hybrid solar units were reduced between 10% and 43%, where  as specific CO2 emissions reduced by 20-35%. MGT provides advantages over photovoltaic systems such as the inherent ability to hybridize the systems with hydrocarbon fuels to produce electricity around the clock, and the ability to operate more effectively in very hot climates with photovoltaic performance degradation over the life time of the  system. Hybrid solar micro gas-turbines are cost-effective, eco-friendly and pollution free as they can work by burning any gas like natural gas,landfill gasa and others.This paper presented the controls contained in the MGT-dish system consisted of temperature control, fuel flow control, speed and acceleration control. Aconceptual design of the 25kW MGT-dish system was also covered.
Volume: 18
Issue: 6
Page: 3184-3190
Publish at: 2020-12-01

Performance comparison of different control strategies for the regulation of DC-DC negative output super-lift luo-converter

10.11591/ijece.v10i6.pp5785-5792
Hassan Jassim Motlak , Ahmed S. Rahi
In last years, dc-dc converters solve the most issues in the industrial application in the area of power electronics, especially renewable energy, military applications and affiliated engineering developments. They are used to convert the DC input that unregulated to regulated output perhaps larger or smaller than input according to the type of converters. This paper presents three primary control method used for negative output Super lift Luo DC-DC converter. These methods include a Voltage mode control (VMC), Current mode control (CMC), and Sliding mode control (SMC). The goal of this article is to study and selected an appropriate and superior control scheme for negative DC-DC converters. The simulation results show the effectiveness of Sliding mode control for enhancing the performance of the negative dc-dc converter. Also, this method can keep the output voltage constant under load conditions. simulation results obtained by the MATLAB/Simulink environment.
Volume: 10
Issue: 6
Page: 5785-5792
Publish at: 2020-12-01

Motion artifacts reduction in cardiac pulse signal acquired from video imaging

10.11591/ijece.v10i6.pp5687-5693
Murthad Al-Yoonus , Mustafa H. Alhabib , Mustafa Zuhaer Nayef Al-Dabagh , M. F. L. Abdullah
This study examines the possibility of remotely measuring the cardiac pulse activity of a patient, which could be an alternative technique to the classical method. This type of measurement is non-invasive. However, several limitations may deteriorate the accuracy of the results, including changes in ambient illumination, motion artifacts (MA) and other interferences that may occur through video recording. The paper in hand presents a new approach as a remedy for the aforementioned problem in cardiac pulse signals extracted from facial video recordings. Partitioning provides the basis for the presented MA reduction method; the acquired signals are partitioned into two sets for each second and every partition is shifted to the mean level and then all the partitions are recombined again into one signal, which is followed by low-pass filtering for enhancement. The proposed compared with ordinary pulse oximetry Photoplethysmographic (PPG) method. The resulted correlation coefficient was found (0.957) when calculated between the results of the proposed method and the ordinary one. Experiments were implemented using a common camera by creating a dataset from 11 subjects. The ease of implementation of this method with a simple that can be used to monitor the cardiac pulse rates in both home and the clinical environments.
Volume: 10
Issue: 6
Page: 5687-5693
Publish at: 2020-12-01

Predictions on wheat crop yielding through fuzzy set theory and optimization techniques

10.12928/telkomnika.v18i6.15870
Julio Barón; Universidad Distrital Francisco José de Caldas Velandia , Norbey Danilo Muñoz; Universidad Distrital Francisco José de Caldas Cañón , Brayan Leonardo Sierra; Universidad Distrital Francisco José de Caldas Forero
Agricultural field’s production is commonly measured through the performance of the crops in terms of sow amount, climatology, and the type of crop, among other. Therefore, prediction on the performance of the crops canaid cultivators to make better informed decisions and help the agricultural field. This research work presents a prediction on wheat crop using the fuzzy set theory and the use of optimization techniques, in both; traditional methods and evolutionary meta-heuristics. The performance prediction in this research has its core on the following parameters: biomass, solar radiation, rainfall, and infield’s water extractions. Besides, the needed standards and the efficiency index (EFI) used come from already developed models; such standards include: the root-mean-square error (RMSE), the standard deviation, and the precision percentage. The applicationof a genetic algorithm on a Takagi-Sugeno system requires and highly precise prediction on wheat cropping;being, 0.005216 the error estimation, and 99,928 the performance percentage.
Volume: 18
Issue: 6
Page: 3011-3018
Publish at: 2020-12-01

Sentiment analysis of comments in social media

10.11591/ijece.v10i6.pp5917-5922
Abdulrahman Alrumaih , Ali Al-Sabbagh , Ruaa Alsabah , Harith Kharrufa , James Baldwin
Social media platforms are witnessing a significant growth in both size and purpose. One specific aspect of social media platforms is sentiment analysis, by which insights into the emotions and feelings of a person can be inferred from their posted text. Research related to sentiment analysis is acquiring substantial interest as it is a promising filed that can improve user experience and provide countless personalized services. Twitter is one of the most popular social media platforms, it has users from different regions with a variety of cultures and languages. It can thus provide valuable information for a diverse and large amount of data to be used to improve decision making. In this paper, the sentiment orientation of the textual features and emoji-based components is studied targeting “Tweets” and comments posted in Arabic on Twitter, during the 2018 world cup event. This study also measures the significance of analyzing texts including or excluding emojis. The data is obtained from thousands of extracted tweets, to find the results of sentiment analysis for texts and emojis separately. Results show that emojis support the sentiment orientation of the texts and that texts or emojis cannot separately provide reliable information as they complement each other to give the intended meaning.
Volume: 10
Issue: 6
Page: 5917-5922
Publish at: 2020-12-01

A novel two-polynomial criteria for higher-order systems stability boundaries detection and control

10.12928/telkomnika.v18i6.16256
N.; Swinburne University Mir-Nasiri , Md. Hazrat; Nazarbayev University Ali
There are many methods for identifying the stability of complex dynamic systems. Routh and Hurwitz’s criterion is one of the earliest and commonly used analytical tools analysing the stability of dynamic systems. However, it requires tedious and lengthy derivations of all components of the Routh array to solve the stability problem. Therefore, it is not a simple method to define analytically, stability boundaries for the coefficients of the system characteristic equation.The proposed brand-new criterion is an effective alternaztive technique in identifying stabilityhigher-order linear time-invariant dynamic system that binds the coefficients of the system characteristic polynomial at the stability boundaries by means of an additional single constantk. It defines the necessary and sufficient conditions for the absolute stability of higher-order dynamic systems. It also allows the analysing of the system’s precise marginal stabilityor marginal instability condition when the roots are relocated on imaginary jω-axis of s-plane. The criterion proposed bythe authors, in contrast to Routh criteria, simplifies the identification of maximum and minimum stability limits for any coefficient of the higher-order characteristic equation significantly. The derived in the paperstability boundary formulas for the polynomial coefficients are successfully used for the proportional integral derivative (PID) controller with single or multiple gains selections in closed-loop control system.
Volume: 18
Issue: 6
Page: 3164-3172
Publish at: 2020-12-01

TPACK in ASEAN perspectives: Case study on Thai pre-service teacher

10.11591/ijere.v9i4.20700
Prasart Nuangchalerm
Technological Pedagogical and Content Knowledge (TPACK) is now recognizing for teacher development and preparation program. The new era of teaching and learning are not only focus on contents, but also pedagogical knowledge, technology and education with instructional strategies are now necessary for teacher preparation program. This study focuses on identifying and summarizing the features of TPACK in ASEAN literatures. The review was conducted using the ACI database; a total of 11 articles describing TPACK based on specific search criteria. The framework of TPACK needs to generalize to school policy, administrative purposes and teacher development and teacher preparation program. Also, the exploratory TPACK of 7 Thai pre-service science teachers in one-year school practicum provided significant findings through TPACK questionnaire and lesson plan analysis. Data were collected and analyzed by descriptive analysis. The explorative study illustrated the nature of their TPACK by concept and practice was at high level. The study needs pre-service teacher have technology integration in teacher preparation program, also TPACK should be implemented in teacher development program.
Volume: 9
Issue: 4
Page: 993-999
Publish at: 2020-12-01

Views of primary Thai teachers toward STREAM education

10.11591/ijere.v9i4.20595
Prasart Nuangchalerm , Veena Prachagool , Treekom Prommaboon , Juhji Juhji , Imroatun Imroatun , Khaeroni Khaeroni
This study employed survey method for exploring views of teachers toward science, technology, reading, engineering, arts and math science, technology, reading, engineering, arts and math (STREAM) education. Primary teachers were asked their views through questionnaires after STREAM education workshop. Results revealed that teachers have holistic view and having positive view towards STREAM education even though all of them are not science or mathematics teachers. Change in belief and way of practices can allow teachers to do STREAM education in every classroom, design-based learning and creative classroom should be promoted as well. However, holistic view will be more effective into classroom, technology and other supporting learning environments should be prepared.
Volume: 9
Issue: 4
Page: 987-992
Publish at: 2020-12-01

Towards better performance: phase congruency based face recognition

10.12928/telkomnika.v18i6.17300
Muthana H.; Al-Mustansiriyah University Hamd , Rabab A.; Al-Mustansiriyah University Rasool
Phase congruency is an edge detector and measurement of the significant feature in the image. It is a robust method against contrast and illumination variation. In this paper, two novel techniques are introduced for developing alow-cost human identification system based on face recognition. Firstly, the valuable phase congruency features, the gradient-edges and their associate dangles are utilized separately for classifying 130 subjects taken from three face databases with the motivation of eliminating the feature extraction phase. By doing this, the complexity can be significantly reduced. Secondly, the training process is modified when a new technique, called averaging-vectors is developed to accelerate the training process and minimizes the matching time to the lowest value. However, for more comparison and accurate evaluation,three competitive classifiers:  Euclidean distance (ED),cosine distance (CD), and Manhattan distance (MD) are considered in this work. The system performance is very competitive and acceptable, where the experimental  results show promising recognition rates with a reasonable matching time.
Volume: 18
Issue: 6
Page: 3041-3049
Publish at: 2020-12-01
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