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29,939 Article Results

The effectiveness of “PEKA BERAKSI” programs in improving self-efficacy to prevent the risky sexual behavior in adolescents

10.11591/ijphs.v11i1.20960
Valen Fridolin Simak , Etty Rekawaty , Dwi Cahya Rahmadiyah
Risky sexual behavior is a health problem among adolescents whose cases continue to increase along with technological developments. It needs to be overcome by increasing self-efficacy among adolescents. The purpose of this study was to provide an overview and influence of the implementation of “PEKA BERAKSI” on self-efficacy in adolescents to prevent risky sexual behavior. This study used quasi-experimental design with pre and posttest without control group method. The study involved 275 students. The instrument used to measure the variables of self-efficacy was measured with the instrument developed by researchers. The variable risky sexual behaviour was measured with the instrument sexual risk survey. The finding showed that there was a significant difference in self-efficacy in adolescents in preventing risky sexual behavior before and after the intervention 0.001. The results of statistical tests found a p-value of 0.006 which means that there is a significant effect between the “PEKA BERAKSI” intervention and risky sexual behavior. Based on these results, recommended for health services to make the innovation program that focuses health education for adolescents and health promotion at schools. Furthermore, the results of this intervention as basic data in developing school health clinics and integrating subjects with health education for adolescents.
Volume: 11
Issue: 1
Page: 54-60
Publish at: 2022-03-01

New lambda tuning approach of single input fuzzy logic using gradient descent algorithm and particle swarm optimization

10.11591/ijeecs.v25.i3.pp1344-1355
Fauzal Naim Zohedi , Mohd Shahrieel Mohd Aras , Hyreil Anuar Kasdirin , Nurdiana Binti Nordin
Underwater remotely operated vehicle (ROV) is important in underwater industries as well as for safety purposes. It can dive deeper than humans and can replace humans in a hazardous underwater environment. ROV depth control is difficult due to the hydrodynamic of the ROV itself and the underwater environment. Overshoot in the depth control may cause damage to the ROV and its investigated location. This paper presenting a new tuning approach of single input fuzzy logic controller (SIFLC) with gradient descent algorithm (GDA) and particle swarm optimization (PSO) implementation for ROV depth control. The ROV was modeled using system identification to simulate the depth system. Proportional integral derivative (PID) controller was applied to the model as a basic controller. SIFLC was then implemented in three tuning approaches which are heuristic, GDA, and PSO. The output transient was simulated using MATLAB Simulink and the percent overshoot (OS), time rise (Tr), and settling time (Ts) of the systems without and with controllers were compared and analyzed. The result shows that SIFLC GDA output has the best transient result at 0.1021% (OS), 0.7992s (Tr), and 0.9790s (Ts).
Volume: 25
Issue: 3
Page: 1344-1355
Publish at: 2022-03-01

Effect of socio-economic status on the prevalence of diabetes mellitus in Indonesia

10.11591/ijphs.v11i1.21080
Amalia Kusumaningrum , Rico Ricardo
The case of diabetes mellitus in Indonesia shows an increasing trend, especially in the upper socio-economic groups. This study aimed to determine the effect of socioeconomic status on the prevalence of diabetes mellitus in Indonesia using data from the Indonesia family life survey (IFLS). This study was intentionally targeted at individuals aged 15 years and over who are respondents to IFLS-5. Diabetes mellitus becomes the dependent variable, while the independent variables comprise age, gender, education, income, body mass index, and smoking behavior. Logistic regression was performed to determine the potential socio-economic factors associated with diabetes mellitus. The results reveal that socio-economic status influences the prevalence of diabetes mellitus in Indonesia. The higher the income level, the probability of diabetes mellitus increases by 0.466 percent. Meanwhile, individuals who attended university had a 2.86 percent higher probability than individuals with a primary level of education.
Volume: 11
Issue: 1
Page: 281-286
Publish at: 2022-03-01

Design and simulation of DC distributed power supply with power balance control technique

10.11591/ijpeds.v13.i1.pp460-469
Uthen Kamnarn , Jedsada Yodwong , Pratch Piyawongwisal , Pakawadee Wutthiwai , Anon Namin , Phatiphat Thounthong , Noureddine Takorabet
This paper presents the analysis, design and simulation of DC distributed power supply controlled with power and energy balance control technique. The proposed system consists of 5 connection structures of DC to DC converters which are parallel, cascade, source splitting, load splitting, and stack. The system mathematical model is analyzed by the average small-signal method. The proposed power balance control technique is used in the instance where the main sources supply the load of the system. The energy balance control technique is used in the case that the load at the 24 V and 12 V bus is backed up with a battery. The DC Distributed system is simulated by MATLAB/Simulink. The system has 1 kW power rating and contains 6 voltage bus with voltage ratings of 380, 100, 60, 48, 24, and 12 V. The simulation results show that, with the proposed power balance design and control technique, the system provides good dynamic responses and stability. In addition, the proposed technique simplifies the parameter design of the PI controller and solves the basic control limitations of the DC to DC converter.
Volume: 13
Issue: 1
Page: 460-469
Publish at: 2022-03-01

Mobile recommender system based on smart city graph

10.11591/ijeecs.v25.i3.pp1771-1776
Karwan Hoshyar Khalid Khoshnaw , Zardasht Abdulaziz Abdulkarim Shwany , Twana Mustafa , Shayda Khudhur Ismail
Mobile recommender systems have changed the way people find items, purposes of intrigue, administrations, or even new companions. The innovation behind mobile recommender systems has developed to give client inclinations and social impacts. This paper introduces a first way to build a mobile recommendation system based on smart city graphs that appear topic features, user profiles, and impacts acquired from social connections. It exploits graph centrality measures to expand customized recommendations from the semantic information represented in the graph. The graph shows and chooses graph algorithms for computing chart centrality that is the center of the mobile recommender system are exhibited. Semantic ideas, for example, semantic transcendence and likeness measures, are adjusted to the graph model. Usage challenges confronted to settle execution issues are additionally examined.
Volume: 25
Issue: 3
Page: 1771-1776
Publish at: 2022-03-01

Robust control technique in power converter with linear induction motor

10.11591/ijpeds.v13.i1.pp340-347
Nicolás Toro García , Yeison Alberto Garcés Gomez , Vladimir Henao Cespedes
Induction motors are widely used in industrial applications as actuators, thanks to their simplicity of construction, which is subsequently reflected in low-cost maintenance. This paper shows the behavior of a three-phase power converter with a linear induction motor (LIM) as load, using a quasi-sliding control technique for output voltage regulation and a new control technique to control chaos. Digital pulse width modulation (DPWM) techniques are widely used to control electronic power converters. The controller proposed in this paper was designed using zero average dynamic (ZAD) and fixed point inducting control (FPIC) techniques. The ZAD-FPIC control strategy was designed and applied to a three-phase converter with linear induction motor load. Since it is not possible to measure the secondary currents, a secondary current observer was included in the system. Finally, bifurcation diagrams are shown as a technique for tuning controller parameters in ZAD-FPIC controllers. For the illustration of numerical results a simulation of the linear induction motor drive controlled was made by MATLAB/Simulink. The designs were tested in a rapid control prototyping (RCP) system based on digital signal processing (DSP) for dSPACE platform, using the 1103 controller card and control desk interface.
Volume: 13
Issue: 1
Page: 340-347
Publish at: 2022-03-01

The performances of partial shading adjuster for improving photovoltaic emulator

10.11591/ijpeds.v13.i1.pp528-536
Razman Ayop , Chee Wei Tan , Syed Norazizul Syed Nasir , Mohd Zaki Daud , Lau Kwan Yiew , Norjulia Mohamad Nordin , Abba Lawan Bukar
A photovoltaic (PV) emulator (PVE) is essential equipment for the research and diagnostic of PV generation. It is a convenient, highly efficient, and low-cost approach when compared to controllable light sources. Nonetheless, the implementation of the partial shading capability in a PVE is highly limited in terms of efficiency, computation burned, number of power converters, and flexibility to change in the ambient condition. This paper proposes a partial shading adjuster for a PVE that can overcome the aforementioned limitations. The adjuster is applicable to the conventional PVE since it is based on an algorithm that can be added to the controller of the PVE. By adding the adjuster, the conventional PVE can emulate partial shading. The partial shading adjuster is added into a PVE that uses the direct referencing control strategy with the buck controller regulated by the proportional-integral controller. The results show that the PVE maintains its accuracy and produces a stable output voltage and current during the load changes when the adjuster is added. In conclusion, the proposed partial shading adjuster able to improve th
Volume: 13
Issue: 1
Page: 528-536
Publish at: 2022-03-01

Group investigation model to improve interpersonal skills

10.11591/ijere.v11i1.21914
Nur Ainiyah , Anik Ghufron , Marzuki Marzuki , Said Subhan Posangi , Kasim Yahiji , Abdul Rohman , Moch. Tolchah , St. Wardah Hanafie Das
This study aimed to prove the effectiveness of the application of the group investigation learning model in improving students' interpersonal skills. The sample of this study was 116 students, which was determined by a simple random sampling technique. This experimental research used pre-test post-test Control Group Design. Data were obtained by direct observation of the interpersonal skills of students during the learning process. Final observation score of interpersonal skills is 0.026 and the t value count greater than t table (2.272>1.980). Thus, there are differences in interpersonal skills between the experimental class and the control class. This means that the use of the group investigation model is effective in improving students' interpersonal skills.
Volume: 11
Issue: 1
Page: 467-474
Publish at: 2022-03-01

A proposed asymmetrical configuration of cascaded multilevel inverter topology for high level generation

10.11591/ijpeds.v13.i1.pp289-297
Lipika Nanda , Chitralekha Jena , Arjyadhara Pradhan , Babita Panda
Multilevel inverters are having high demand in high power applications. It works in medium voltage range. In this converter, for specific time intervals fewer switches will be conducting so switching loss is also reduced. This paper represents overall total harmonic distortion (THD) for different levels and different carrier frequencies. Switching loss, conduction loss of inverter has been discussed and hence inverter efficiency can be calculated. Phase displacement pulse width modulation method has been proposed in order to generate pulses. The proposed topology is well presented by its practical implementation with two current direct sources. All the simulations are being carried out using MATLAB/Simulink platform to validate the hardware results.
Volume: 13
Issue: 1
Page: 289-297
Publish at: 2022-03-01

Design and implementation of reduced number of switches for new multilevel inverter topology without zero-level state

10.11591/ijpeds.v13.i1.pp401-410
Rakan Khalil Antar , Taha Ahmed Hussein , Abdallah Mohamed Abdullah
Currently, multilevel inverter (MLI) has been chosen over conventional inverter because of less harmonic distortions and higher output voltage levels. In this paper, 15 level inverter with reduced number of power switching devices is designed. Different output voltage levels can be obtained including zero level or with none zero level (NoneZero level). Single phase MLI inverter with 7 switches is built, simulated, and implemented practically. The system depending on modified absolute sinusoidal pulse width modulation (MASPWM) controller strategy is adopted. Simulation results clarified that MLI with NoneZero level provides output voltage with total harmonic distortion (THD) percent less than with zero level. The THD of the 15 level output voltage with zero level is 3.39%, while with NoneZero level is 3%, respectively. The system is tested at different output levels. The THD values at different output voltage levels is reduced by 12% depending on NoneZero level state. Depending on what has been achieved, the system has been implemented practically with NoneZerolevel and the THD value was 3.1%. These results prove the success of the suggested MLI circuit and MASPWM controller to obtain the required voltage level and THD.
Volume: 13
Issue: 1
Page: 401-410
Publish at: 2022-03-01

Teachers’ acceptance of mobile technology use towards innovative teaching in Malaysian secondary schools

10.11591/ijere.v11i1.21872
Siti Noor Ismail , Mohd Norakmar Omar , Yahya Don , Yoppy Wahyu Purnomo , Muhamad Dzahir Kasa
The integration of mobile technology is not a new thing nowadays. It became increasingly applied after the COVID-19 pandemic hit the world. Teachers need to use mobile technology devices widely to improve teaching effectiveness. This study aimed to explore the elements of teachers' acceptance of mobile technology as a learning alternative. The respondents consisted of 422 teachers in 24 secondary schools around Kedah, Malaysia. The results showed that teachers are impressed to integrate mobile technology based on three dimensions: effort expectancy, hedonic motivation, and habit. This situation reflects teachers' willingness to translate their pedagogical abilities through the medium of technology. It has also recognized that internal motivation and teachers' natural habits are the driving force behind integrating mobile technology as a teaching aid to digital technology. Thus, mobile technology is a trend of daily use and can be utilized as the most advanced pedagogical material to go through learning in the 21st century.
Volume: 11
Issue: 1
Page: 120-127
Publish at: 2022-03-01

Torque ripple minimization in direct torque control at low-speed operation using alternate switching technique

10.11591/ijpeds.v13.i1.pp631-642
Muhammad Zaid Aihsan , Auzani Jidin , Azrita Alias , Siti Azura Ahmad Tarusan , Zuraidi Md Tahir , Tole Sutikno
Direct torque control (DTC) of induction motor is prominent to offer instant torque and flux control with a simple control structure. However, this scheme suffers from two major drawbacks namely high torque ripple and variable switching frequency of the inverter, especially during low-speed operation. During the low-speed condition, the positive torque slope is very steep and torque overshoot occurs frequently resulting in the torque ripple become of great significance. This paper proposes a new and effective technique to reduce the torque ripple by integrating the alternate switching technique to the inverter switching status to limit the torque slope surge. By varying the frequency and duty cycle of the alternate switching, the rate of surge can be controlled resulting in the chances of overshoots, and selection of reverse voltage vector can be avoided. The feasibility of the proposed technique has been validated using MATLAB/Simulink software and through experimental results. The results show the proposed alternate switching technique minimizes over 40% reduction in the torque ripple while maintaining the simple structure of DTC.
Volume: 13
Issue: 1
Page: 631-642
Publish at: 2022-03-01

Emergency congestion management of power systems by static synchronous series compensator

10.11591/ijeecs.v25.i3.pp1258-1265
Majeed Rashid Zaidan , Saber Izadpanah Toos
From a transmission system point of view, any overload on the grid lines during operation in situations such as peak load or emergency conditions include line outage or generator outage, is refers to congestion. Generally, the congestion can be managed by controlling power flow. On the other hand, series compensation has a significant role in control power flow; therefore, series compensation equipment like fixed series capacitor (FSC), thyristor-controlled series capacitor (TCSC), and static synchronous series compensator (SSSC) can be used for congestion management. In this paper, an SSSC is used in a transmission line to manage congestion in emergency conditions, line outage and generator outage. The congestion rent contribution method has been used to determine the location of the SSSC in the IEEE 14-bus test system. This technique finds the transmission line 1-2 (from bus 1 to bus 2) is the best location of the SSSC to reduce congestion. After installing an SSSC in the specified line, simulation results show that the power flow has been controlled, leading to reducing the congestion. In other words, the effectiveness of the SSSC can be seen in reducing the total congestion rent, the total generation cost, and network losses.
Volume: 25
Issue: 3
Page: 1258-1265
Publish at: 2022-03-01

Influence of non-sinusoidal power supply on the performance of a single-phase capacitor induction motor

10.11591/ijeecs.v25.i3.pp1246-1257
Omar Sharaf Al-deen Alyozbaky , Mohd Zainal Abidin Ab‐Kadir
Harmonic is seen to be an important factor that can influence the performance of different electrical appliances. Earlier studies have regarded the non-sinusoidal power supply as the major source of the harmonic in the induction motors. In this paper, the researcher compared the results generated by a single-phase capacitor induction motor (SIM) using the sinusoidal and non-sinusoidal power supplies. The results in the study could help in comprehensively understanding the impact of the harmonic on the effective performance of the SIM machines when they were powered using a non-sinusoidal power supply. Here, the performance of the SIM when subjected to a maximum load or non-load condition were studied and determined. Furthermore, numerous experimental work was presented to validate the results of the SIM. Power analyses and spectral analysis indicated the actual difference in the overall harmonic wave distortion. It was seen that the current load increased to 89% (i.e., an increase of 11%) when the motor working from the non-sinusoidal source. This investigation highlighted the direct impact of the non-sinusoidal power source on the properties and components of the SIM machine. The vibrations measured under varying conditions and compared the results for the 2 types of power supplies.
Volume: 25
Issue: 3
Page: 1246-1257
Publish at: 2022-03-01

Impact of on-grid solar energy generation system on low voltage ride through capability

10.11591/ijpeds.v13.i1.pp488-499
Mohammad Ahmad Shawqi , Mokhtar Hussien Abdallah , Ibrahim Ahmed Nassar
This paper represented a control strategy for photovoltaic (PV) system, this control strategy was referred to as a low voltage ride through (LVRT), it had been achieved by using three phase (3-PH) (PV) grid-connected system, where this paper discussed the way to achieve maximum output active power from the solar system, while the solar system remained connected to the grid with voltage decreasing controller techniques and this was valid until certain amount of voltage decreasing which was clarified in the results. The main goal of low voltage ride through depended on injecting reactive power to the grid, amount of the injected reactive power depended on regulations of the grid code using the control of the inverter and the strategy depended on the grid voltage drop amount. MATLAB simulation had been used to achieve what was mentioned above, which led to present various cases of achieving maximum output active power with grid voltage drops by using conventional proportional integral (PI) control of the inverter. Finally, another control method, which was proportional integral genetic algorithm (PI-GA), had been used to improve value of the generated output active power.
Volume: 13
Issue: 1
Page: 488-499
Publish at: 2022-03-01
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