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31,377 Article Results

Determination of the level of pedagogical formation students’ academic locus of control

10.11591/ijere.v8i3.18166
Süleyman Can , Erdil Durukan
Academic locus of control has an important place in explaining students’ behaviors in educational settings. The purpose of the current study is to determine the level of the pedagogical formation students’ academic locus of control and to investigate whether this level varies depending on some variables. The study employed the survey model, one of the quantitative research methods. The universe of the study is comprised of the students enrolled at the pedagogical formation program initiated in the fall term of 2015-2016 academic year in Muğla Sıtkı Koçman University and the sampling consists of 397 pedagogical formation students. As the data collection tool, the academic locus of control scale was used in the current study. It was concluded that the pedagogical formation students’ level of academic locus of control is medium. It was also found that the students’ academic locus of control, internal locus of control and external locus of control do not vary significantly depending on gender and department; yet, vary significantly depending on age. Furthermore, the pedagogical formation students’ level of satisfaction was found to be significantly correlated with the external locus of control but not with the internal locus of control and academic locus of control.
Volume: 8
Issue: 3
Page: 531-536
Publish at: 2019-09-01

Rain attenuation in broadband satellite service and worst month analysis

10.11591/ijeecs.v15.i3.pp1443-1451
Idrissa Abubakar , Jafri Bin Din , Lam Hong Yin , Manhal Alhilali
Satellite link design, link margin and services at lower bands of satellite spectrum has been facing the challenges of meeting the demands for higher bandwidth requirements. Satellite operators and service providers are been compelled to migrate to the use of higher frequencies above 10 GHz. These higher frequencies were discovered to be vulnerable to atmospheric degradation creating the challenge of service availability especially for tropical rain zones with higher rainfall intensities and longer rain event durations. This study strive to evaluate the profile of rainfall and the monthly and annual variability to improve the design parameters of satellite propagation. Two yeas rainfall measurement campaign was conducted in Abuja at Nigcomsat-1R ground station with a view to understanding the characteristics of Abuja rain. The location of the site is on lat. 9.06o N and lon. 7.48o E. Tipping bucket rain gauge was used for point rain rate and 1.8 m VSAT antenna was installed to monitor the rain induced attenuation on satellite broadband signal. The results shows a huge variability between month to month as well as annual average between 2016 and 2017. The performance of broadband satellite service was found to largely to depend on the quality of the carrier power above the system noise rather than bandwidth capacity or the receive signal level while higher attenuations are associated with higher rain intensities and the slant path effects.
Volume: 15
Issue: 3
Page: 1443-1451
Publish at: 2019-09-01

Design of pitch angle controller for wind turbine based on pi neurofuzzy model

10.11591/ijeecs.v15.i3.pp1662-1670
Ammar A. Aldair , Mofeed T. Rashid , Ali F. Halihal , Mastaneh Mokayef
Aerodynamic torque of wind turbine is adjusted by controlling the pitch angle of the blades of the turbine when the wind speed is higher than rated wind speed. So that, in the recent research in this field, the pitch angle controller becomes dominated controller type for extracting the electrical power from the wind energy. Three types of the pitch angle control systems are designed to construct the speed controller: conventional PI controller, Neurofuzzy controller and modified PI-Neurofuzzy controller. The results are shown that the modified PI-Neurofuzzy controller is more efficient than the others because the rotation speed of generator is kept almost constant. It means that the generated output power has remained constant at maximum power limited even the wind speed rises up the rated wind speed.
Volume: 15
Issue: 3
Page: 1662-1670
Publish at: 2019-09-01

Intelligent risk management framework

10.11591/ijai.v8.i3.pp278-285
Wissam Abbass , Zineb Bakraouy , Amine Baina , Mostafa Bellafkih
The Internet of Things (IoT) is rapidly increasing and enhancing today’s world by introducing a large set of interconnected devices. Several beneficial services are produced by these devices as for area monitoring and process control. However, IoT security is still a major problem. In fact, IoT’ security beggings largely whith an effective Risk Management process. However, the essense of this process is to acquire a risk inventory cibling the IoT devices. Nevertheless, it is quite difficult to obtaining this latter which significantly adds complication issues to the Risk Management. Without the ability of holisticly identify the IoT critical devices, inaccurate Risk Management is achieved which leads unfortunately to novel risk exposures. Traditional Riskbased approaches fails drastically at apprending IoT’ potential attacks. The dynamic structure, the heteregouns nature of devices, the various security objectives and infrastructure pervasiveness are key factors impacting the overall perfomance. Thus, a holistic Risk Management witihin the IoT is indispensable. Accordingly, we propose an intelligent Risk Management framework using Mobile Agents in order to deliver preventive and responsive assessment.
Volume: 8
Issue: 3
Page: 278-285
Publish at: 2019-09-01

Examining the object-based and pixel-based image analyses for developing stand volume estimator model

10.11591/ijeecs.v15.i3.pp1586-1596
Dwi Putra Apriyanto , I Nengah Surati Jaya , Nining Puspaningsih
In the last two decades there has been significant leap on the spatial resolution of the satellite digital images which may be very useful for estimating stand parameter required for forest as well as environment management. This paper describes development of stand volume estimator models using SPOT 6 panchromatic and multispectral images with an object-based digital image analysis (OBIA) and conventional pixel-based approaches. The data used include panchromatic band with1.5m spatial resolution, and multispectral band with6m spatial resolution. The proposed OBIA technique with mean-shift algorithm was functioned to derive a canopy cover variable from the fusion of the panchromatic and multispectral, while the pixel-based vegetation index was used to develop model with an original pixel-size of 6 m.  The estimator models were established based on 65 sample plots both measured in the field and images.  The study found that the OBIA provides more accurate identification with Kappa Accuracy (KA) of 71% and Overall Accuracy (OA) of 86%. The study concluded that the best stand volume estimation model is the model that developed from the canopy cover (C) derived from OBIA i.e., v = 13.47e0.032C with mean deviation of only 0.92%, better than the model derived from conventional pixel-based approach, i.e., v = 0.0000067e16.48TNDVI with a mean deviation of 5.37%.
Volume: 15
Issue: 3
Page: 1586-1596
Publish at: 2019-09-01

What is critical thinking? A longitudinal study with teacher candidates

10.11591/ijere.v8i3.20254
Serap Yılmaz Özelçi , Gürbüz Çalışkan
Critical thinking skills that enhance the ability of individuals to understand and make sense of the world and events and situations around them are one of the foremost research areas in the educational system of various countries. As a critical thinking individual, decisions made by the teacher in his/her class, the activities he/she has performed and the explicit and implicit messages given by him/her to the class are clearly observed by the students. It is believed that the situation of teachers’ having critical thinking skills and critical thinking personality effects on students' perceptions and achievements about critical thinking. In this context, the aim of the research is to determine the perceptions of the teacher candidates about critical thinking and to observe the changes in these perceptions over time. Interviews were held with 11 prospective teachers for two times for 4 years and their thoughts on critical thinking were examined. According to the findings obtained, the thoughts of the teacher candidates regarding the critical thinking do not change over time but they are not seen enough. Teacher candidates make decisions with emotional references and they are reluctant to inquire and research.
Volume: 8
Issue: 3
Page: 495-509
Publish at: 2019-09-01

Energy efficiency index by considering number of occupants: a study on the lecture rooms in a university building

10.11591/ijeecs.v15.i3.pp1154-1160
Noor Ameera Zakaria , Mohammad Yusri Hassan , Hayati Abdullah , Md Pauzi Abdullah , Faridah Hussin , Siti Maherah Hussin , Nur Najihah Abu Bakar
The building sector is attributed to approximately 40% of the nation’s energy consumption and this accounts for a significant percentage of the nation’s energy consumption. For this reason, energy efficiency in buildings has now become an important subject in the national energy scenario. Energy Efficiency Index (EEI) is one of the energy consumption indicators that is widely used in the building sector for measuring energy performance. This index is generally measured based on the energy used per unit of building floor area. However, this index is not able to directly identify other factors affecting energy usage. This paper suggests an Energy Efficiency Index (EEI) for determining the performance of lecturer rooms in a university building. Unlike the conventional EEI, the proposed EEI determines the room’s energy usage performance by considering the number of occupants. The study was conducted at the Faculty of Electrical Engineering, Universiti Teknologi Malaysia (UTM) and the results show that the number of occupants significantly influences the energy usage performance of rooms in a university building.
Volume: 15
Issue: 3
Page: 1154-1160
Publish at: 2019-09-01

Cognitive perceptions of second language acquisition in Chinese undergraduate ESL/EFL students: A mixed methods approach

10.11591/ijere.v8i3.20246
Robert W. Elliott , Di Zhang
With the continued demand for teachers of English as a Second Language (ESL/EFL) in China, colleges and universities in China continue to struggle with teaching oral English to high volumes of undergraduate students using faculty-centered strategies. This concurrent mixed-methods, single-level, case study intends to examine Chinese undergraduate students’ cognitive perceptions of their oral English ability as a segue to a more effective second language acquisition environment in a 21st Century global education. The data analysis revealed three main themes intersected by the findings of the quantitative and qualitative analyses. The findings from this and future studies are intended to guide leaders, administrators, scholars, and students to affect national and provincial policy, school and classroom-based practices, and personal strategies to enhance students’ ability to acquire their oral English skills.
Volume: 8
Issue: 3
Page: 510-518
Publish at: 2019-09-01

Computational intelligence based lossless regeneration (CILR) of blocked gingivitis intraoral image transportation

10.11591/ijai.v8.i3.pp197-204
Anirban Bhowmik , Joydeep Dey , Arindam Sarkar , Sunil Karforma
This paper presented that an intraoral image has been wrapped during wireless transportation with an encryption tool with an added essence of lossless regeneration property. Threshold based cryptographic transportation has provided the construction of reliable and robust medical data communication system. The accumulation of threshold shares only would result to the formation of the intraoral gingivitis image at the receivers’ end. The proposed technique dealt with the generation of n number of partial shares by creating a unique frame structure by the dentist / physician. Additional feature has been proposed on the computational lossless transportation.The existing techniques cause a high computational complexity. The proposed technique ensured the lossless regeneration property while blocked gingivitis image sharing. Filling of bits have been incorporated to ensure the static sized homogeneous blocks of intraoral gingivitis image. A graphical masking method had been deployed, followed by successive decryption procedure on minimum threshold shares that ensure lossless data regeneration. This can guide the dental treatment with enhanced accuracy. Different types of statistical testing like entropy analysis and histogram analysis confirms the exhibition of authenticity, confidentiality, and integrity of our proposed technique.
Volume: 8
Issue: 3
Page: 197-204
Publish at: 2019-09-01

Review of anomalous sound event detection approaches

10.11591/ijai.v8.i3.pp264-269
Amirul Sadikin Md Affendi , Marina Yusoff
This paper presents a review of anomalous sound event detection (SED) approaches. SED is becoming more applicable for real-world appliactaions such as security, fire determination or olther emergency alarms. Despite many research outcome previously, further research is required to reduce false positives and improve accurracy. SED approaches are comprehensively organized by methods covering system pipeline components of acoustic descriptors, classification engine, and decision finalization method. The review compares multiple approaches that is applied on a specific dataset. Security relies on anomalous events in order to prevent it one must find these anomalous events. Audio surveillance has become more efficient as that artificial intelligence has stepped up the game. Autonomous SED could be used for early detection and prevention. It is found that the state of the art method viable used in SED using features of log-mel energies in convolutional recurrent neural network (CRNN) with long short term memory (LSTM) with a verification step of thresholding has obtained 93.1% F1 score and 0.1307 ER. It is found that feature extraction of log mel energies are highly reliable method showing promising results on multiple experiments.
Volume: 8
Issue: 3
Page: 264-269
Publish at: 2019-09-01

Development of a remote tending system for analog broadcast transmitters

10.11591/ijeecs.v15.i3.pp1474-1484
Gerino Mappatao , Isaiah Mari Zebedia Bautista , Marc Kevin Orsos , Mark Aldrine Ribo , Joseph Castillo
Whenever a broadcast transmitter is on-air, it is required to be tended by licensed broadcast technicians. Technicians periodically monitor the transmitter performance, record the supply voltage and current at the last stage of the power amplifier and keeps a copy for at least two years. Also recorded are the times the transmitter is turned ON and OFF as well as the times the transmitter shuts down and returns back to air. This paper proposes a system to remotely tend analog transmitters in one central monitoring station. The remote tending of several transmitters in one location is made possible through internet connection. However, the challenge in the proposed system is in the gathering of transmitter data. A prototype of the system was constructed and tested in an FM broadcast transmitter. Test results on the prototype performance show that the proposed system can effectively be used to remotely monitor, record data and control the status of analog broadcast transmitters. The primary feature of the proposed system of monitoring several transmitters in one location will bring cost effective advantages to the broadcast operators. 
Volume: 15
Issue: 3
Page: 1474-1484
Publish at: 2019-09-01

Killer whale-backpropagation (KW-BP) algorithm for accuracy improvement of neural network forecasting models on energyefficient data

10.11591/ijai.v8.i3.pp270-277
Saadi Bin Ahmad Kamaruddin , Nor Azura Md Ghani , Hazrita Ab Rahim , Ismail Musirin
Green technology building is not newly introduced to the world nor Malaysia, but it is rarely practiced globally and now it has promoted noteworthy due to destructions caused by human hands towards the nature. Now people started to realize that the world is polluted by many hazardous substances. Therefore, Help University came up with the effort of preserving the nature through a new Green Technology campus, which has been fully operated since year 2017. In this research, neural network forecasting models on energy-efficient data of Help University, Subang 2 green technology campus at Subang Bistari, Selangor has been done with respect to value-formoney (VFM) attribute. Previously there were no similar research done on energy-efficient data of Help University, Subang 2 campus. The significant factors with respect to energy or electricity saved (MW/hr) in the year 2017 variable were studied as recorded by Building Automation and Control System (BAS) of Help University Subang 2 campus. Using multiple linear regression (stepwise method), the significant predictor towards energy saved (MW/hr) was Building Energy Index (BEI) (kWh/m2/year) based p-value<α=0.05. A mathematical model was developed. Moreover, the proposed neural network forecasting model using Killer WhaleBackpropagation Algorithm (KWBP) were found to better than existing conventional techniques to forecast BEI data. This research is expected to specifically assist maintenance department of Help University, Subang 2 campus towards load forecasting for power saving planning in years to come.
Volume: 8
Issue: 3
Page: 270-277
Publish at: 2019-09-01

Risky teenager behavior in a vocational high school

10.11591/ijere.v8i3.20241
Suci Musvita Ayu , Marsiana Wibowo , Liena Sofiana
Adolescence is a very complex period. Various teen problems haunt when they grow up to become adults. The same teenagers successfully face the challenges of their development so that they are free from a variety of risky behaviors. However, some of them also smoke, consume alcohol, have free sex, commit violence, and use drugs. This research is a qualitative study with a phenomenological approach in which researchers explore and try some risky behaviors in health and factors that influence and how adolescents in vocational high schools end up committing some risky behavior. The results of the study show that teens who do not have risky behavior and who do have some risk behaviors have different understandings related to the impact of these behaviors. People around teenagers influence how teenagers will behave. These influential people can cause teenagers to take risky behavior, such as family problems, get bad examples from parents, family members, peers, and idols. Factors that influence adolescents to end up committing risky behavior are the understanding of the negative effects of risk behavior. The various causes of influential people include parents, peers, religious leaders, idols, perceived benefits, self-control, and intention. The internal and external factors of adolescents determine whether the teenager will do or not risky behavior. Strong collaboration between internal and external factors shapes behavior which is not risky in adolescents, and vice versa.
Volume: 8
Issue: 3
Page: 470-475
Publish at: 2019-09-01

Dynamic bifurcation analysis and mitigation of SSR in SMIB system

10.11591/ijeecs.v15.i3.pp1128-1137
Shruthi Ramachandra , Mala R.C. , H. V. Gururaja Rao
This paper presents a detailed study on Sub-synchronous resonance in a Single machine connected to an infinite bus system by employing Bifurcation Theory. The synchronous machine model considered is a two-axis model, the turbine system is a six mass system. A comparative study of Sub-synchronous resonance for the two-axis synchronous machine models 1.1, 2.1 and 2.2 under constant excitation is presented in this paper. The effect of adding an exciter, power system stabilizer and Static Synchronous Series Compensator to the SMIB system, incorporated with a 2.2 synchronous machine model on the bifurcations of SSR is also investigated. The results obtained on replacing the fixed series compensation of the line by Static Synchronous Series Compensator resulted in the mitigation of Sub-synchronous Resonance. The results obtained for all the above-considered cases are compared with eigenvalue analysis and validated using transient analysis.
Volume: 15
Issue: 3
Page: 1128-1137
Publish at: 2019-09-01

Signal modulation techniques in Non-orthogonal waveform for future wireless communication system

10.11591/ijeecs.v15.i3.pp1458-1465
Siti Rosmaniza AR , Norulhusna Ahmad Ahmad , Sharifah Kamilah Syed Yusof
In the future generation of the wireless communication system, the utilization of bandwidth needs to be managed efficiently. Due to that, research on enhancing the efficiency of the bandwidth has recently attracted numerous interests focusing more on the non-orthogonal waveform generation and detection. Even though non-orthogonal waveform is promising a higher efficiency, it introduces inter-carrier interference (ICI) at the transmitter due to the subcarrier overlapping.  In this paper, the signaling technique for non-orthogonal waveform generation and detection is discussed. This paper also proposed the use of accumulator (ACC) to improve the system performance of the signal modulation in the non-orthogonal waveform for the next generation of the wireless communication system. The result is represented in an EXtrinsic Information Transfer (EXIT) chart to show the effects of adding ACC into the non-orthogonal system.
Volume: 15
Issue: 3
Page: 1458-1465
Publish at: 2019-09-01
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