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29,905 Article Results

Fuzzy-PID controller for an energy efficient personal vehicle: Two-wheel electric skateboard

10.11591/ijece.v9i6.pp5312-5320
Bambang Sumantri , Eko Henfri Binugroho , Ilham Mandala Putra , Rika Rokhana
The two-wheeled electric skateboard (TWS) is designed for a personal vehicle. A Fuzzy-PID control strategy is designed and implemented for controlling its motion. Basically, motions control of the TWS is performed by balancing the pitch position of the TWS. Performance of the designed controller is demonstrated experimentally. The Fuzzy algorithm updates the PID gains and therefore it can handle the changing of the TWS load. Contribution of Fuzzy-PID in reducing the electric energy consumption, which is an important issue in electrical system, is also evaluated. The Fuzzy-PID successes to reduce the electric energy consumption of the TWS compared to the conventional PID.
Volume: 9
Issue: 6
Page: 5312-5320
Publish at: 2019-12-01

Management maintenance system for remote control based on microcontroller and virtual private server

10.11591/ijeecs.v16.i3.pp1349-1355
Idham Kamil , Julham Julham , Muharman Lubis , Arif Ridho Lubis
Open loop shaped control system is a form of system control without any feedback from the system. One example is the on-off condition which functions to connect and disconnect electricity. The condition to be studied is a dc motor that can be set to live and die via internet server-based client service. The server in this system is a virtual private server (VPS) device that will provide a source of service to the client in the form of a collection of information on dc motor conditions. In addition, its function is also to record the working time of the dc motor. So that a schedule can be determined when the dc motor is maintained. While the client is a control unit consisting of a microcontroller device, an ethernet module enc28j60 and a dc motor. In general the working principle of the system is beginning with the user accessing the desired VPS IP address through a web browser application. From the web browser the user chooses a dc motor to be activated. But before the client has been connected to the VPS regularly (every second), the point is to always get the latest dc motor condition information. Then the microcontroller will set the dc motor in active or off condition. The research method used is research and development. The results obtained from this study are that the amount of bandwidth needed for communication between VPS and microcontrollers via the internet network, when the control unit works is 6.02 kbps, while the response time for dc motor is 3.16 seconds and the response time for dc motor 2 is 3.46 seconds.
Volume: 16
Issue: 3
Page: 1349-1355
Publish at: 2019-12-01

Statistical analysis of night radiance RH using VIIRS day/night band satellite time series data

10.11591/ijape.v8.i3.pp249-256
Jyoti U. Devkota
Amount of night lights in an area is a proxy indicator of electricity consumption. This is interlinked to indicators of economic growth such as socio-economic activities, urban population size, physical capital, incidence of poverty. These night lights are generated by renewable and non renewable energy source. In this paper the behavior of night radiance RH data was minutely analyzed over a period of 28 hour; Visible Infrared Imaging Radiometer Suite Day/Night Band (VIIRS DNB) satellite earth observation data were used. These 28 hours and 8936 observations time series data is from 2 September 2018 to 4 September 2018. The behavior of night radiance RH data over 122 time intervals was analyzed using box plots. It was seen that the arithmetic mean of RH data is more sensitive than the arithmetic mean of first order difference of RH data. The first order difference of night radiance RH was regressed on night radiance over 110 intervals of time. The box plot of slope and intercept of this linear regression showed the behavior of these regression parameters over 110 intervals of time. It is seen that the data are more scattered with respect to slope than with respect to intercept. This implies that the rate of change in RH with respect to change in time has more variability that the intrinsic value of RH data at the sampled point of time.
Volume: 8
Issue: 3
Page: 249-256
Publish at: 2019-12-01

Wavelet based performance analysis of AC transmission systems with unified power flow controller under power quality issues

10.11591/ijape.v8.i3.pp299-308
M. Nagaraju , V. V. K. Reddy , M. Sushama
The developments in power quality are fast and difficult to predict. The majority of power quality issues experienced by industrial customers can be attributed to momentary interruptions, voltage sags or swells, transients, harmonic distortion, electrical noise, and flickering lights, among others. A new device may be invented tomorrow solving power quality problems. The FACTS devices could provide fast control of active and reactive power through a transmission line. The unified power-flow controller (UPFC) is a member of the FACTS family with very attractive features. This device can independently control many parameters, so it is the combination of the properties of a static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC).The performance of AC Transmission system with Unified power flow controller under various power quality problems analysis described. The proposed system is formulated and research work is done by wavelet multi resolution analysis using Bior1.5 mother wavelet with MATLAB/SIMULINK software. It is observed that the effectiveness of AC power transmission through Unified power flow controller under power quality problems of sag, swell, transient, temporary faults and capacitive switching.
Volume: 8
Issue: 3
Page: 299-308
Publish at: 2019-12-01

Cyber-victimization and perceived depression: Serial mediation of self-esteem and learned-helplessness

10.11591/ijere.v8i4.20266
Kususanto Ditto Prihadi , Yen Ling Hui , Melissa Jane Chua , Calvin K.W. Chang
Literature suggests that the perception of being cyber-victimized is a stronger predictor of depression symptoms than the perception of being victimized offline, and that learned-helplessness can explain the prediction of perceived cyber-victimization on perceived depression. Nevertheless, other studies suggested that the link between perceived cyber-victimized and learned-helplessness is weakened by state self-esteem. This study investigates the double mediation effect of state self-esteem and learned-helplessness on the relationship between perceived cyber-victimized and perceived depression. 104 participants between 18 and 30 years of age (63 females, 41 males, 1 prefer not to say) have been recruited through haphazard sampling method to fill in the Cyberbullying Victimization Scale, State Self-Esteem Scale, Learned Helplessness Scale, and Beck’s Depression Inventory. Our findings suggest that the double mediation effect occurs. As a conclusion, our findings suggested that cyberbullied social media users will only fall into perceived depression when their state self-esteem is also negatively affected by their perception of being cyberbullied, up to the point where they learn that they are helpless. Further implication are discussed at the end of the paper.
Volume: 8
Issue: 4
Page: 563-574
Publish at: 2019-12-01

Utilization of the finite element method for the calculation and examination of underground power cable ampacity

10.11591/ijape.v8.i3.pp257-264
Mahmood Khalid Hadi
Currently, the use of underground electric cables is a regular feature of present-day power transmission and distribution schemes. Issues related to economical limitations and the lack of adequate space led to the need for cables with an elevated current carrying capacity (ampacity). In order to achieve this objective, public services around the globe are focusing not only on better designs, but also on improving the level of precision in the context of cable parameter values. Precise parameter values are essential for ensuring that the replicated outcomes correspond sufficiently close to actual circumstances. While the conventional approach to ampacity calculation is through the IEC-60287 procedure, the numerical route is considered more specific and flexible. This endeavour harnesses the finite element method to conceive an innovative process for calculating the thermal field and ampacity of a cable. This process involves the crafting of a temperature field distribution model for scrutinizing temperature distribution in the region of an electric cable, and the deployment of the linear interpolation procedure for computing its ampacity. Subsequent to its formation, the model was put into operation on the underground cable 33KV XLPE.
Volume: 8
Issue: 3
Page: 257-264
Publish at: 2019-12-01

Assessing the intelligence of a student through TIC-TAC-TOE game for career guidance

10.11591/ijece.v9i6.pp5545-5551
Sastry Kodanda Rama Jammalamadaka , Chandra Prakash Vudatha
In order to provide Career Guidance by an expert system to a student, apart from his/her academic record, it is necessary to assess various psychological factors of the student like Intelligence, patience and perseverance, Learning ability and Speed of solving problem, etc. The outcome of this research work is an expert system called Tic-Tac-Toe Game Playing Career Guidance System (TTT-GP-CGS) that is useful to assess the psychological factors of the student through Tic-Tac-Toe Game Playing, build the cognitive model of the student and predict the appropriate career(s) for the student. The system plays Tic-Tac-Toe game with the student several times. The average score obtained by the student reflects his/her intelligence. The average time taken by the student for playing the game reflects student's speed of solving problem. The number of attempts the student makes reflects the students patience and perseverance. When the student plays the game with the spaystem every day, if the student's  score increases day by day, it reflects that the student has good learning ability. In this way the system will assess the psychological factors of the student and builds the cognitive model of the student. Internally the system converts the quantitative scores into qualitative scores. The system maintains a table of careers and the expected levels of psychological factors that are required from student's side to carry out the career successfully. The system invokes a matching process  by considering the cognitive model of the student and the table of careers, and predicts the career(s) suitable  to the student.
Volume: 9
Issue: 6
Page: 5545-5551
Publish at: 2019-12-01

Speed control of DC motor using conventional and adaptive PID controllers

10.11591/ijeecs.v16.i3.pp1221-1228
Sarah N. Al-Bargothi , Ghazi M. Qaryouti , Qazem M. Jaber
Proportional Integral Derivative (PID) controllers are extensively used in practical industries to control the speed of DC Motors. The single weakness of PID controllers is their sensitivity to variation in parameters and operating conditions; thus, tuning the controller gains to adapt with these variations presents a practical challenge. In this paper, an adaptive mechanism that utilizes a Recursive Least Square (RLS) algorithm, with rate limiters, is implemented to perform an online self-adjusting of each of the PID gains in order to achieve Adaptive PID (APID) controller that will accommodate to system variations. MATLAB/ Simulink software is used to implement and simulate APID control of a Chopper-Fed DC motor. A conventional PID control system is also designed and simulated to obtain results that can be used to judge the performance of the APID controller. Results proved that the APID controller forced the motor speed to track the reference input with insignificant tracking error, and also managed to attain the motor speed at its desired value, regardless of the load changes inflected on the motor. This enhances both transient and steady-state speed responses.
Volume: 16
Issue: 3
Page: 1221-1228
Publish at: 2019-12-01

Performance evaluation of roof top solar photovoltaic systems in Tamilnadu

10.11591/ijape.v8.i3.pp265-276
M. Aravindan , V. Balaji , V. Saravanan , M. Arumugam
This manuscript reports the monitored performance results of roof top solar photovoltaic (PV) power plants in different parts of Tamilnadu, India. In this work, PV plants of capacities 84 kWp and 18 kWp located at Tirunelveli and Ranipet respectively in Tamilnadu are considered. During an eight month period, of September 2014 to April 2015, these plants had generated 43.99 MWh and 15.55 MWh units of electricity respectively. The average electricity production per day for the considered period of these plants is 181.74 kWh and 62.81 kWh respectively. The performance ratio (PR) of these plants PV1 and PV2 is found to be 0.52 and 0.86 respectively. The characteristics of poly crystalline PV modules and the performance of employed photovoltaic inverters are also analyzed.It is observed that external conditions like climate and bad weather significantly reduces the PV system output, whereas it reduces marginally due to inverter failure as observed from the values of energy yield and performance ratio of these plants. Online monitoring of PV plant with DC/AC line and phase voltages and current waveforms observed for the given day are also presented.
Volume: 8
Issue: 3
Page: 265-276
Publish at: 2019-12-01

A review of cloud oriented mobile learning platform and frameworks

10.11591/ijece.v9i6.pp5529-5536
Ahmad Shukri Bin Moh Noor , Marwan Nasser Yousef Atoom , Rabiei Mamat
With the continued growth of mobile devices usage, wireless communications improvement, and cloud computing evolution, many educational institutions around the world, especially universities and colleges, began to provide their students with mobile learning systems based on cloud computing. The widespread, ubiquitous, and flexible natures of mobile devices make mobile learning an attractive alternative in education, particularly when integrating it with cloud computing which is the up-to-date technology that delivers computing hardware and software as services. However, the participatory between mobile learning and cloud computing as a cloud based mobile learning (CBML) becomes one of the important methods in the learning process. Many researches have attempted to combine the unique features of CBML in a form of frameworks. These frameworks have been designed to identify, categorize, or evaluate the major components of the CBML system. This paper is an attempt to identify the important role of cloud computing technology in mobile learning, investigate the main advantages and limitations of CBML systems, and explore the previously designed CBML frameworks.
Volume: 9
Issue: 6
Page: 5529-5536
Publish at: 2019-12-01

The role of social media in reshaping the academic activities of vocational and technical education lecturers in Nigeria

10.11591/ijere.v8i4.20305
Adamu Muhammaed Jebba
The use of social media is one of the predominant features in the average daily life of students and lecturers across tertiary institutions in Nigeria. It was against this backdrop that this study was carried out to determine the role of social media in reshaping the future of academic activities among lecturers of Vocational and Technical education in Nigeria. The study adopted descriptive survey research design. A structured questionnaire consisting of 40- items was developed by the researcher for data collection. The reliability of the instrument was determined using Kuder Richardson (KR20) formula which yielded 0.85. The population of the study comprised lecturers from the two Colleges of Education in Niger State.  Four research questions guided the study. The findings revealed among others that social media is a technological tool that can reshape the future of teaching Vocational and Technical education as it brings with it new opportunities which is capable of promoting collaborative teaching and learning as well as the potential to promote and reshape the future of higher education in institutions of learning. Furthermore, the trend according to the findings of this study revealed that the overwhelming patronage is in terms of making new friends (online), playing games, exchange of affectionate/love messages, online chatting, sharing selfies, spreading false information, hate speeches, and even quarrelling with virtual friends. On the basis of these findings, some recommendations were made which among others include the need for the college management to mount capacity building programmes to retrain the lecturers to understand the concept of social learning and to keep them abreast with innovative teaching and learning platform such as social media.
Volume: 8
Issue: 4
Page: 735-741
Publish at: 2019-12-01

DC-AC power inverter controlled analogically with zero hysteresis

10.11591/ijece.v9i6.pp4767-4776
Fredy E. Hoyos Velasco , Carlos I. Hoyos Velasco , John E. Candelo-Becerra
This paper presents the design and experimental validation of a DC-AC power inverter, controlled analogically with zero hysteresis. A control circuit was built using analog electronics components, and optocoupler devices are used to couple the control module with the power stage. The design of DC-AC inverter with electronics circuit and implementation are shown in detail.  Experimental results show the effectiveness of control technique and implementation, leading to a robust system concerning load disturbances. The developed inverter offers the possibility of generating regulated output voltages of different signal types, both DC and AC, variable in frequency and in amplitude, useful for feeding a load with various AC signals.
Volume: 9
Issue: 6
Page: 4767-4776
Publish at: 2019-12-01

New studies on network frequency responses considering dynamic loads

10.11591/ijape.v8.i3.pp209-220
L. T. M. Trang , H. Nouri
The dynamic model construction of transmission network components that include generator buses, load buses and power branches, within MATLABSimulink environment is presented. The degree of frequency deviation of buses when the power of motor loads and static loads vary, is studied. Furthermore, the influence of motor loads with different inertia constants are considered in the control technique of load frequency using a PID controller. The results show that the frequency oscillation of the dynamic load is greater than the frequency oscillation of static load. Also the speed of frequency control of the dynamic load is greater than the speed of the frequency control of the static load and the inertia constants of the dynamic load has significant influence on the frequency control characteristics.
Volume: 8
Issue: 3
Page: 209-220
Publish at: 2019-12-01

Neutral point clamped quasi Z source inverter for photovoltaic systems

10.11591/ijape.v8.i3.pp277-286
M. Aravindan , V. Balaji , V. Saravanan , M. Arumugam
Multilevel inverters are becoming popular for power conversion in renewable energy systems, AC-DC hybrid micro grids etc. The voltage stress and inrush current through these inverter leg switches are quite higher as compared to the load ratings which increase the chances of inverter leg switch failure. A three level neutral point clamped quasi Z source inverter topology is discussed in this paper which has the features of lower component count, reduced capacitor voltage stress, and it can be operated at different control strategies to achieve wide range of voltage boosting ability, suited for photovoltaic (PV) systems. It also ensures continuous input current irrespective of the DC supply voltage variations and injects stable and smooth power to the load/grid. The effectiveness of the proposed inverter is verified by simulation results in MATLAB Simulink model as well as performing experiment with the help of a laboratory prototype.
Volume: 8
Issue: 3
Page: 277-286
Publish at: 2019-12-01

Investigation of indoor propagation of WLAN signals

10.11591/ijeecs.v16.i3.pp1356-1363
Mohammed Sameer Salim , khalil Hassan Sayidmarie , Abdullah Hassan Aboud
The propagation of radio waves inside a typical university building is investigated by simulation and measurements. The Line of sight (LOS) and Obstructed Line of sight (OLOS) propagation scenarios were considered. The received power from a WLAN access point operating at 2.45GHz was determined from the simulations and measurements at various positions, orientations, and heights of the Tx and Rx antennas. The path loss exponents were estimated from the obtained simulation and measurement results of the received power variation with distance. The obtained path loss exponent values were found between 1.15-1.63 for LOS propagation and 2.14-2.55 for OLOS.
Volume: 16
Issue: 3
Page: 1356-1363
Publish at: 2019-12-01
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