Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Filter Icon

Filters article

Years

FAQ Arrow
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,939 Article Results

Maximum resolution of switched capacitor converter: a graphical approach

10.11591/ijpeds.v13.i1.pp330-339
Sara Khalid Natheer , Mohamad Natiq Abdul Kadir
The efficiency of a switched capacitor converter can be represented as the ratio of the output voltage to open-circuit voltage. Switched capacitor converters with adjustable gain are designed with multiple no-load voltages to obtain higher efficiency over the voltage control range. This paper aims to realize the maximum resolution of a switched capacitor converter. A graphical representation of the output voltages formation has been proposed. The voltage composition diagram reveals a switching pattern of the multiphase operation cycle that leads to the desired output voltage. The proposed method has been applied to determine all possible output voltage levels that lead to maximum resolution. A three-capacitor converter has been controlled with the proposed scheme. The simulation results show that the output voltage follows the reference voltage closely. The converter provides 60% more output voltage steps compared to the nearest comparable design in the literature.
Volume: 13
Issue: 1
Page: 330-339
Publish at: 2022-03-01

Motivation and implementation of Islamic concept in madrasah ibtidaiyah school: Urban and rural

10.11591/ijere.v11i1.21943
Alfauzan Amin , Asiyah Asiyah , Zulkarnain Syafal , Alimni Alimni , Nurlaili Nurlaili , Ayu Wulandari , Dwi Agus Kurniawan
This study aimed to see how students' motivation and understanding of the concept of Islamic religion in students in rural and urban areas. This research uses mixed-method research. Qualitative data will be supporting data for quantitative data. The sample of this study consisted of 87 students and eight teachers in urban and 99 students and eight teacher rural Islamic elementary school students with random sampling technique. Instrument in the study used a questionnaire for motivation with a Likert scale of 4 and a test for understanding the concept of Islam. In this study, there are two types of data analysis used, namely quantitative analysis using descriptive statistics (mean, standard deviation, and category), and inferential statistics (independent sample t-test) using the SPSS 21 application, for qualitative using reducing analysis, analyzing, and interpreting findings from Miles and Huberman. The findings of this study illustrated that motivation was good (M=2.88, SD=0.78) and understanding of student concepts (M=81, SD=0.77) was good too, but in rural areas are better than in urban areas. This finding has implications that the challenges of Islamic religion in urban areas are greater for students. The novelty in this study is the implicit finding of this study that external factors (school social environment, community social environment, family environment) have a major influence on motivation and understanding of Islamic religious concepts.
Volume: 11
Issue: 1
Page: 345-352
Publish at: 2022-03-01

Identify tooth cone beam computed tomography based on contourlet particle swarm optimization

10.11591/ijai.v11.i1.pp397-404
Hiba Adreese Younis , Dhafar Sami Hammadi , Ansam Nazar Younis
In this paper certain type of biometric measurements has been used to identify the cone beam computed tomography (CBCT) radiograph of the subject in a fast and reliable way. Where the CBCT radiograph of a person is used as a data and stored in database for later use in a person’s recognition process. The aim of this research is to use various stages of the preprocessing operations of the CBCT radiograph to obtain the clearest possible image that will help us in the identification process more easily and precisely. The contourlet transformation was used for feature extraction of each particular CBCT image and the results were processed by a new hybrid particle swarm optimization (PSO) named "contourlet PSO" algorithm (CPSO), which is faster and produce more precise (due to apply contourlet algorithm) than traditional PSO. The proposed algorithm (CPSO) gave a detection ratio of 98% after its application on 100 CBCT radiographs.
Volume: 11
Issue: 1
Page: 397-404
Publish at: 2022-03-01

The trend of sharenting among Malaysian parents: a qualitative study on their content and motivation

10.11591/ijphs.v11i1.21193
Lee Jia Wen , Crendy Tan , Saroja Dhanapal
With social media having penetrated people’s daily life, sharenting has become a common phenomenon among the current generation. The term “sharenting” is derived from the combination of the words “share” and "parenting” which refers to parents who often post or share their children’s photos/videos on social media such as Facebook, Instagram, Snapchat, YouTube, Blog, and so on. Sharenting has resulted in a lot of consequences due to the sharing of children’s information. To understand the consequences of sharenting, the current research analysed the contents of children’s information that are shared by parents in Malaysia. The research also investigated the reasons that motivated parents to be involved in the trend of sharenting. A qualitative research adopting one-to-one interview was conducted to obtain in-depth information and knowledge from the respondents selected through a non-probability snowball sampling method. The responses from the interviews were analysed using a thematic analysis where it was noted that in terms of the content shared, two key themes emerged specifically funny and interesting photos as well as children’s educational progress. On the other hand, in terms of reasons for sharenting, the respondents listed several reasons including to keep in touch with friends/family members, to keep as memories, and gain support from others.
Volume: 11
Issue: 1
Page: 310-319
Publish at: 2022-03-01

Photovoltaic hybrid boost converter fed switched reluctance motor drive

10.11591/ijpeds.v13.i1.pp275-288
Ravi Kiran Dasari , Godwin Immanuel Dharmaraj
Pollution from conventional transportation methods is a worrying factor. Electric vehicles are a viable option to reduce environmental pollution and to replace the conventional methods of using internal combustion (IC) engine based transportation system. renewable source driven electric vehicles (EV) opens up non-dependency on conventional energy sources. The renewable energy source (like photovoltaic system) insists on the switch mode converter to augment its voltage range. This paper presents a hybrid boost switch mode DC-DC converter to increase the voltage range of the photovoltaic (PV) system. The wheels of electric vehicle are coupled to switched reluctance motor (SRM). Closed-loop speed controlled SRM drives the wheels of EV. Asymmetrical converter feeds the excitation current to the coils of 6/4 pole current-controlled SRM. The proposed EV system is analyzed for fixed and variable torque with speed condition using MATLAB/SIMULINK software.
Volume: 13
Issue: 1
Page: 275-288
Publish at: 2022-03-01

NPN Sziklai pair small-signal amplifier for high gain low noise submicron voltage recorder

10.11591/ijpeds.v13.i1.pp11-22
Sachchida Nand Shukla , Syed Shamroz Arshad , Geetika Srivastava
Small signal-to-noise ratio (SNR) and multiple noise sources, coupled with very weak signal amplitudes of bio signals make brain-computer interface (BCI) application studies a challenging task. The front-end recorder amplifiers receive very-weak signal (few μV) from high impedance electrodes and for efficient processing of such weak and low frequency (
Volume: 13
Issue: 1
Page: 11-22
Publish at: 2022-03-01

Analysis of named-entity effect on text classification of traffic accident data using machine learning

10.11591/ijeecs.v25.i3.pp1672-1678
Anugrah Dwiatmaja Putra , Abba Suganda Girsang
With the rising number of accidents in Indonesia, it is still necessary to evaluate and analyze accident data. The categorization of traffic accident data has been developed using word embedding, however additional work is needed to achieve better results. Several informative named entities are frequently sufficient to differentiate whether or not information on a traffic accident exists. Named-entities are informational characteristics that can offer details about a text. The influence of named-entities on thematic text categorization is examined in this paper. The information was collected using a Twitter social media crawl. Preprocessing is done at the beginning of the process to modify and delete useful text as well as label specified entities. On Support Vector Machine (SVM), scheme comparisons were performed for (i) Word Embedding, (ii) the number of occurrences of Named Entities, and (iii) the combination of the two is known as a Hybrid. The Hybrid scheme produced an improvement in classification accuracy of 90.27 percent when compared to Word Embedding scheme and occurrences of named entities scheme, according to tests conducted using 1.885 data consisting of 788 accident data and 1.067 non-accident data.
Volume: 25
Issue: 3
Page: 1672-1678
Publish at: 2022-03-01

COVID-19 awareness among undergraduates in a private university

10.11591/ijphs.v11i1.21132
Yi-Fan Tan , Lee-Yeng Ong , Meng-Chew Leow
Since the first declaration of the coronavirus disease 2019 (COVID-19) outbreak in December 2019, the pandemic has brought some significant lifestyle changes among the people across the globe. There might be some underestimation in the severity level of COVID-19 among younger people, specifically around the age group of undergraduates. This study evaluated the awareness level of Malaysian undergraduates towards COVID-19 in Malaysia via an online survey hosted in a COVID-19 awareness roadshow event. This study highlighted the importance of high awareness level of the pandemic among undergraduates and their impact towards managing the spread of the pandemic to the vulnerable population. The respondents were information technology (IT) undergraduates from Multimedia University Melaka Campus, Malaysia. The overall awareness level of the undergraduates is high. Most respondents had a clear understanding on the effects of personal hygiene and personal protective equipment to avoid getting infected with COVID-19, as well as where to go if they got infected with the coronavirus. Most respondents also showed decent knowledge in identifying the basic symptoms of COVID-19. These findings give an insight into the COVID-19 awareness level among undergraduates and may help the policymakers and university managements to control the spread of COVID-19 and other emerging infections.
Volume: 11
Issue: 1
Page: 28-37
Publish at: 2022-03-01

Optimal economic dispatch using particle swarm optimization in Sulselrabar system

10.11591/ijai.v11.i1.pp221-228
Marhatang Marhatang , Muhammad Ruswandi Djalal
In this study, a particle swarm optimization (PSO) is proposed to optimize the cost of generating thermal plants in the South Sulawesi system. The study was con ducted by analyzing several methods using the lagrange and ant colony optimization (ACO). PSO algorithm converges on the 11th iteration algorithm with the lowest generation cost obtained, which is Rp129687962.17/hour. While the ACO algorithm converges on the 34th iteration with a generation cost of Rp131,473,269.39/hour. The results of optimization using PSO produce a total thermal power of 400.75 MW and losses of 26.15 MW. The PSO method is able to reduce the cost of generating the South Sulawesi system by Rp11,118,312.07/hour or 7.9%. While using the ACO method generates a generation cost of Rp131,473,269.39/hour to generate power of 400,812 MW with losses of 26,219 MW. The ACO method is able to reduce the cost of generating the South Sulawesi system by Rp9,333,004.9/hour or 6.62%. PSO algorithm provides the lowest cost calculation of generator compared with conventional methods and ACO smart methods. This is also shown in the calculation process, the PSO method completes calculations faster than the ACO method.
Volume: 11
Issue: 1
Page: 221-228
Publish at: 2022-03-01

Simulation of sheath voltage, losses and loss factor of high voltage underground cable using MATLAB/Simulink

10.11591/ijpeds.v13.i1.pp200-215
Mahmood Natiq Abed , Osamah Abdulsalam Suhry , Mohammed Ahmed Ibrahim
In this paper, 22 equations for high voltage cable sheaths are simulated in one model. The model outputs are represented by cable sheath voltages, circulating currents, losses and factors, eddy currents, losses, and factors in both tides laying states (trefoil and flat) when grounding the sheaths from a single point, two points, or cross-link. These values depend on the cable manufacturing's specific factors. The other factors affecting these values are specific to the laying and operation: the load current, the length of the cable to be laid out, the spacing between the cables, and the power frequency. This research aims to reduce or eliminate the losses of the cable sheath. These two types of currents cause losses that may sometimes equal the losses of the conductor of the cable carrying the load current. Which reduces the capacity of the cable and reduces the heat dissipation of the cable into the soil and damages it. Electricians are at risk of electrocution due to the high voltages of the sheaths when there is no current in the sheaths. Therefore, these currents and voltages must be eliminated by making a new model that studies the effect of all these factors on them.
Volume: 13
Issue: 1
Page: 200-215
Publish at: 2022-03-01

AraBERT transformer model for Arabic comments and reviews analysis

10.11591/ijai.v11.i1.pp379-387
Hicham EL Moubtahij , Hajar Abdelali , El Bachir Tazi
Arabic language is rich and complex in terms of word morphology compared to other Latin languages. Recently, natural language processing (NLP) field emerges with many researches targeting Arabic language understanding (ALU). In this context, this work presents our developed approach based on the Arabic bidirectional encoder representations from transformers (AraBERT) model where the main required steps are presented in detail. We started by the input text pre-processing, which is, then, segmented using the Farasa segmentation technique. In the next step, the AraBERT model is implemented with the pertinent parameters. The performance of our approach has been evaluated using the ARev dataset which contains more than 40,000 comments-remarks records relate to the tourism sector such as hotel reviews, restaurant reviews and others. Moreover, the obtained results are deeply compared with other relevant states of the art methods, and it shows the competitiveness of our approach that gives important results that can serve as a guide for further improvements in this field.
Volume: 11
Issue: 1
Page: 379-387
Publish at: 2022-03-01

Lightning rod system: mathematical analysis using the rolling sphere method

10.11591/ijpeds.v13.i1.pp237-246
Jairo Mora Martínez , Eliana Maria Noriega Angarita , José Ricardo Núñez Alvarez , Michelle Hernandez Crespo , Paulo José Fruto Pertuz
In electrical protection, there is a method of electrical protection of buildings against atmospheric discharges called the electro-geometric method or the rolling sphere method. So far, it is possible to achieve the implementation of this method graphically, that is, representing through plans and technical drawings, the protection conditions of the analyzed structure and obtaining from these graphic representations the protection parameters with the consequent errors caused by the scales and dimensions of the work plane. In the present work, a mathematical model is obtained that allows, using specific calculations, to analyze the dynamic behavior of a protection system against atmospheric discharges without worrying about the limitations given by the scales and planes. The set of equations obtained in the model allows us to determine the different parameters that define the protection system against atmospheric discharges (lightning) without depending on the graphical representation of the system's topology.
Volume: 13
Issue: 1
Page: 237-246
Publish at: 2022-03-01

Symptoms of post-traumatic stress among victims of school bullying

10.11591/ijphs.v11i1.20997
Luky Kurniawan , Natri Sutanti , Zalik Nuryana
School bullying is a critical issue among students that can promote some mental health issues. Some studies had found that severe or frequent bullying can lead to the development of post-traumatic stress symptoms such as avoidance behaviours and anxious feelings. However, school bullying is difficult to observe due to the complexity factors such as cultural background, peer pressure and academic problems. The study aimed to investigate the symptoms of post-traumatic stress among victims of school bullying. The study employed a descriptive qualitative research design. The data was collected by using a questionnaire to 42 students from two vocational high schools in Yogyakarta who had severe or frequent experience of school bullying. The results revealed that 40 per cent of participants showed one or more symptoms of post-traumatic stress such as feeling persistently avoiding to the perpetrators and feeling extremely anxious about the potential being bullied again. Meanwhile, 60 per cent participants experienced some other difficult emotions such as anger, revenge, disappointment, and sadness. The results also showed that the two biggest changes experienced by students after bullying were becoming more silent and being frequently anxious compared to before being bullied. The study suggests the need for further research to investigate the level of post-traumatic stress experienced by the students and the urge for anti-bullying curriculum in both schools to prevent the serious consequences of bullying.
Volume: 11
Issue: 1
Page: 263-273
Publish at: 2022-03-01

Study of current ripple characteristics of inverter-fed multiple three-phase AC motors

10.11591/ijpeds.v13.i1.pp68-83
Anwar Muqorobin , Pekik Argo Dahono
The need of higher power and more reliable applications have promoted the use of multiphase alternating current (AC) drives. Mostly the motors are used in wide speed operation range. To control the motors, in the low speed region the motors are operated under pulse width modulation (PWM) mode and in the high speed region, they use square wave mode. In this paper, the current ripple characteristics of inverter-fed multiple three-phase AC motors that are operated under dual mode operation (PWM and square wave modes) are investigated. The optimal motor stator winding configuration will be optimized from the viewpoint of inverter input and motor current ripples. Six-phase motor is used as the representative of even-phase motors and nine-phase motor for odd-phase motors. It is found that nine-phase motor is better than six-phase motor if dual mode operation is desired. Experimental results are incorporated to support the analytical results.
Volume: 13
Issue: 1
Page: 68-83
Publish at: 2022-03-01

Performance evaluation of 50MWp solar plant under different climatic conditions

10.11591/ijpeds.v13.i1.pp561-575
Mohamed Saleck Heyine , Ahmed Mohamed Yahya , Daha Hassan Daher , Léon Gaillard , Christophe Menezo , Abdel Kader Mahmoud
The aim of this study was to evaluate a performance analysis of a 50 MWp solar plant connected to the medium voltage electrical grid installed in the Saharan environment of Nouakchott, Mauritania. This study is done in two seasons characterizing the climate of Nouakchott, then in three typical days based on the measurement data that are obtained from the site of the installation. The measurements were collected daily, to improve the performance evaluation, real-time measurements with a step of 10 seconds for solar irradiation, ambient temperature, module temperature, wind speed, and electrical parameters. The performance evaluation was done based on the IEC 61724 standard to study the comportment of the power plant during different weather conditions. The total energy produced by the plant in May 2020 dry season is 10.559 GWh. However, the total energy produced in November 2019 wet season was 8.132 GWh. Besides, the energy injected by the plant into the grid was for a clear day 263.87 MWh, while for a cloudy day was 118.41 MWh, while it was 39.81 MWh for a sandstorm day. The results showed that temperature and irradiation play an important role in the performance of the system.
Volume: 13
Issue: 1
Page: 561-575
Publish at: 2022-03-01
Show 838 of 1996

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration