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

29,758 Article Results

Wireless charging system using spectral energy harvesting technique

10.11591/ijeecs.v15.i1.pp314-323
Chandrasekharan Nataraj , Mahsoom Raseen Abdul Careem , Ravi Lakshmanan , Sathish Kumar Selvaperumal , Raed Abdulla
This paper presented the energy harvester circuit to enable wireless charging method. The wireless RF spectrum is abundant and potent in the public locations, which can be used for energy harvesting purpose. This is supported by the fact that RF signals are ubiquitous and do not require propagation media of any sort. The system is developed using optimal antenna, matching circuit and charge pump circuit. The 2x2 array type patch antenna operated at 924 MHz is designed and simulated using High Frequency Simulator. The antenna works as a transducer to capture and measure the RF signals from freely available energy source. The field study was conducted at three different highly populated locations such as place of education, place of residence, and place of transport using Software Defined Radio (SDR). The respective acquired RF energy values are -10.45 dBFS (morning), -10.45 dBFS (noon), and -13.33 dBFS (night) at the place of transport for the demonstration purpose. The antenna parameters study also conducted and proved that the antenna gain is good which is greater than 6.6 dB and also return loss greater than -43dB. In addition, charge pump circuit is designed and shown to be capable of boosting the voltage more than 2.5 V easily at the different frequencies for wireless charging purpose.
Volume: 15
Issue: 1
Page: 314-323
Publish at: 2019-07-01

Propagation challenges in 5G millimeter wave implementation

10.11591/ijeecs.v15.i1.pp274-282
Siti Fatimah Nordin , Zuhanis Mansor , Aizat Faiz Ramli , Hafiz Basarudin
With current technology advances, implementing millimeter wave in real life have become more promising. However, before millimeter wave can be deployed, there are several challenges in terms of technical, path loss and shadowing. This paper provides a review on the challenges that might occurs when implementing millimeter wave. An overview of LTE-Advanced and millimeter wave is made to provide further understanding.  A critical analysis is made to identify the problem in rain and haze attenuation, if addressed, will help mobile service provider to overcome the problem.
Volume: 15
Issue: 1
Page: 274-282
Publish at: 2019-07-01

Evolutionary algorithms for path coverage test data generation and optimization: a review

10.11591/ijeecs.v15.i1.pp504-510
Deepti Bala Mishra , Arup Abhinna Acharya , Rajashree Mishra
Software testing is very time consuming, labor-intensive and complex process. It is found that 50% of the resources of the software development are consumed for testing. Testing can be done in two different ways such as manual testing and automatic testing. Automatic testing can overcomes the limitations of manual testing by decreasing the cost and time of testing process. Path testing is the strongest coverage criteria among all white box testing techniques as it can detect about 65% of defects present in a SUT. With the help of path testing, the test cases are created and executed for all possible paths which results in 100% statement coverage and 100% branch coverage .This paper presents a systematic review of test data generation and optimization for path testing using Evolutionary Algorithms (EAs). Different EAs like GA, PSO, ACO, and ABCO based methods has been already proposed for automatic test case generation and optimization to achieve maximum path coverage.
Volume: 15
Issue: 1
Page: 504-510
Publish at: 2019-07-01

Improving lecturers’ evaluation score by using analytic hierarchy process (AHP): a case at universiti kuala lumpur

10.11591/ijeecs.v15.i1.pp391-398
Nurashikin Saaludin , Mohd Hafizul Ismail , Basyirah Che Mat , Suriyati Harun
The quality of education is primarily determined by the academician expertise, skills, abilities and competences. Poor quality of education will give bad impact to the institution.  It is very important to enhance the quality of service to ensure education system in Malaysia higher education is at par as international education standard. To achieve the international standard, the teaching quality of lecturers must be seriously taken into consideration. An appropriate method of lecturers’ evaluation should be used to measure lecturers’ performance and credibility. The purpose of this study is to improve the lecturers’ evaluation score by using Analytic Hierarchy Process (AHP). AHP is used to obtain the weightage of each criteria in lecturers’ evaluation.  The results show that teaching delivery carries the highest weightage, followed by assesment, course content and course material, lecturer’s interaction and lecturer’s commitment criteria. By implementing a new method of calculation, the overall score will be more accurate in describing the overall lecturers performance from students’ point of view.
Volume: 15
Issue: 1
Page: 391-398
Publish at: 2019-07-01

Design of remotely operated vehicle as installer tools of tidal turbine and seismograph under water

10.11591/ijeecs.v15.i1.pp183-189
Muhammad Sulthan Mazaya
Tidal turbines and seismographs constitute instruments that can be used as an earthquake detector that lead to tsunamis. As an early detection instrument for tsunami disaster, tidal turbine and seismograph are generally placed under the surface of the water. The design objective in this study is designing a Remotely Operated Vehicle (ROV) which can be used as a tool for tidal turbine and seismograph installation. The design method applied in this study is designing a prototype by following the product research and development procedures. Making control systems has three stages, namely: software design, hardware manufacture, and software and hardware integration. The made software includes the ROV motion control program through the control of Arduino Nano R2 ATMega microcontroller with programming that uses C-Basic language. The design findings show that the designed ROV can be used effectively to simulate the installation of tidal turbine and seismograph under the surface of the water in 2 meters at depth with 15 minutes of installation time in undulating water.
Volume: 15
Issue: 1
Page: 183-189
Publish at: 2019-07-01

Performance analysis of 5-ary MUSA and SCMA for uplink transmission

10.11591/ijeecs.v15.i1.pp365-372
Esraa Mosleh , Mostafa M. Fouda , Adly S. Tag Eldien , Mohsen M. Tantawy
Multiple access is one of the core technologies of wireless communications, which enables wireless base stations to deal with a large number of different users and provide the service for each of them at the same time.  Meeting the 5G challenges, non-orthogonal multiple access is the main concerned point in 5G technologies. In this paper, two types of non-orthogonal multiple access schemes, namely, 5-ary Multi User Shared Access (MUSA) and Sparse Code Multiple Access (SCMA), are studied. The Bit Error Rate performance (BER) analysis in terms of user overloading for an uplink 5-ary MUSA and SCMA systems are analyzed.
Volume: 15
Issue: 1
Page: 365-372
Publish at: 2019-07-01

Energy management system for PV-battery microgrid based on model predictive control

10.11591/ijeecs.v15.i1.pp20-26
M. Reyasudin Basir Khan , Jagadeesh Pasupuleti , Jabbar Al-Fattah , Mehrdad Tahmasebi
There had been increase of the usage of renewable energy sources to supply electricity in remote areas. However, microgrid consists of renewable sources such as solar Photovoltaic (PV) poses challenges for a reliable energy supply due to its intermittent nature. This paper presents a microgrid model with Energy Management System based on Model Predictive Control (MPC). The microgrid comprises of PV, and battery storage system. The goal of the EMS is to deliver a reliable and optimal generation from multiple sources in the microgrid. Moreover, the MPC will also provide controls for the battery charging for a smooth PV output. The model simulated based on actual load profile and renewable resource such as solar radiation. Several disturbances such as variation of load, generation and PV shading has been simulated to measure the performance of the EMS. The results illustrate the system ability to exhibits robust performance in variety of conditions.
Volume: 15
Issue: 1
Page: 20-26
Publish at: 2019-07-01

A compact miniature fractal planar antenna for RFID readers

10.11591/ijeecs.v15.i1.pp300-305
Mohamed Ihamji , Elhassane Abdelmounim , Jamal Zbitou , Hamid Bennis , Mohamed Latrach
This article presents a new miniature microstrip antenna in the ISM "Industrial Scientific and Medical" band, at 2.45 GHz. This microstrip antenna is designed for RFID reader system, by exploiting the fractal technique and the CPW fed; this antenna is printed on FR4 substrate with dielectric constant of 4.4. The validated antenna has a good matching input impedance range from 2.27 GHz to 2.68 GHz with a stable radiation pattern, a gain of 2.2 dBi, and a directivity of 1.91 dB. The total area of the final circuit is 21.22 x 32.05 mm2. A prototype of the proposed antenna has been fabricated and measured.
Volume: 15
Issue: 1
Page: 300-305
Publish at: 2019-07-01

Evaluation and improvement of the main insulation structure of 33kV distribution transformer based on FEM

10.11591/ijeecs.v15.i1.pp36-47
Ibrahim Jalil Jebur , Kassim Rasheed Hameed
This paper introduces a 2-D FE model to analyze the electric field distribution to evaluate and improve the insulation structure of the 250kVA, 33/0.4kV wound core type distribution transformer using the ANSYS 17.2 by implementing APDL program. The dielectric lighting impulse test was simulated in order to test the presented transformer model according to the IEC67006-3 standard, the assessment process is based on determining the electric stresses and compare it with the maximum permissible value of electric field intensity. Three proposed FE model as an improvement to the insulation structure of the transformer included reducing the insulation distances, changing the materials type, and mix both of them. The results obtained from the FE solution were compared with those of the real test, and presented in form of contours, curves, and vectors. The results obtained from the presented model can be further treated as a reference data in the design process.
Volume: 15
Issue: 1
Page: 36-47
Publish at: 2019-07-01

Optimized health parameters using PSO: a cost effective rfid based wearable gadget with less false alarm rate

10.11591/ijeecs.v15.i1.pp230-239
Talha Ahmed Khan , M. Junaid Tahir , Muhammad Alam , Kushsairy A. Kadir , Zeeshan Shahid
The motive of contriving the proposed research was originated after recognizing some false alarm in measuring health parameters and practical issues in hospitals for example approachability and presence of patient at designated place for the evaluation of the health parameters like Blood pressure, sugar, body temperature, pulse and some other parameters.  The manual entry of the data into the systems have been become a critical problem. To vanquish this problem, a wearable gadget has been designed, so that a patient can carry it feasibly. Various approaches like Bayesian classifier has been applied to minimize the false alarm. Fuzzy logic, Kalman filtering, extended Kalman filtering, support vector machine, multi-layer perceptron, adaptive neuro fuzzy inference system and cuckoo search have been applied to eliminate the false alarm and give the best optimum solution. Results have proved that PSO worked betted as its convergence time is less than the others algorithms and produced best optimum value for the body vitals. Moreover, PSO has been applied to achieve the best optimal results and to increase the performance.  Monitoring of heart pulse rate and body temperature readings that were recorded in database were then tested and validated by comparing digital thermometer and digital inflator. PSO will converge and give the global best position of data by updating the velocity. Results proved that PSO produced better results by optimizing with better accuracy and precision and can be acknowledged as cost-effective solution.
Volume: 15
Issue: 1
Page: 230-239
Publish at: 2019-07-01

Modified singular spectrum analysis in identifying rainfall trend over peninsular Malaysia

10.11591/ijeecs.v15.i1.pp283-293
S.M. Shaharudin , N. Ahmad , N.H. Zainuddin
Identifying the local time scale of the torrential rainfall pattern through Singular Spectrum Analysis (SSA) is useful to separate the trend and noise components. However, SSA poses two main issues which are torrential rainfall time series data have coinciding singular values and the leading components from eigenvector obtained from the decomposing time series matrix are usually assesed by graphical inference lacking in a specific statistical measure. In consequences to both issues, the extracted trend from SSA tended to flatten out and did not show any distinct pattern.  This problem was approached in two ways. First, an Iterative Oblique SSA (Iterative O-SSA) was presented to make adjustment to the singular values data. Second, a measure was introduced to group the decomposed eigenvector based on Robust Sparse K-means (RSK-Means). As the results, the extracted trend using modification of SSA appeared to fit the original time series and looked more flexible compared to SSA.
Volume: 15
Issue: 1
Page: 283-293
Publish at: 2019-07-01

The internet of things in healthcare: an overview, challenges and model plan for security risks management process

10.11591/ijeecs.v15.i1.pp414-420
Nur Azaliah Abu Bakar , Wan Makhtariah Wan Ramli , Noor Hafizah Hassan
The Internet of Things (IoT) has not been around for very long. However, since the notion of IoT introduced, most of IoT studies focused on a strategic level such as planning, architectures, standardization, and latest technologies, however, studies of risk management plan of IoT are still lacking.  IoT has been widely used to link existing medical resources and provide reliable, effective and smart healthcare services to elderly and patients with chronic illnesses.  However, a systematic process is missing when managing and anticipating the risk of IoT usage in healthcare.  For this purpose, this paper extensively explores various IoT technologies used in health care services and its security challenges. As a result, IoT Security Risk Model for Healthcare is introduced to cater a complete process of risk management based on ISO/IEC 27005:2018 standard.  It is believed that by having this model, it will emphasize on iterative IoT risk management process as it may increase the depth and detail of the assessment at each iteration.
Volume: 15
Issue: 1
Page: 414-420
Publish at: 2019-07-01

Statistical analysis using taguchi method for wind turbine in ducting system

10.11591/ijeecs.v15.i1.pp27-35
A. A.Malik , S. M.Maharum , M.Z. W. Mohd. Tohid , M. K.Rahmat , I. H.Hamzah
Wind turbine is a device that converts kinetic energy of wind into electrical energy. Weak air pressure with an average of 2m/s to 4m/s makes wind turbine implementation in Malaysia becoming difficult and unrealistic. In order to produce a good power and torque, a quality air pressure is needed. Wind turbine performance depends on the incoming wind speed. Fluctuating and low quality air pressure are the significant challenges in wind turbine implementation. There are many types of mechanism and control but the production of output power is still considered low compared to the actual equipment. In a large building, Heat Ventilation Air Conditioning (HVAC) system is highly required to control the indoor temperature and consistent air pressure through ducting. The consistency of air pressure in ducting system make a drive for this research to proposed a wind turbine implementation in ducting system in order to produce electrical energy. In HVAC there are five parameters to be considered in order to identify the air pressure distribution in ducting system. These five parameters are input air pressure, ducting height, distance between blower to the pipe, total effective length and gap between trunk or run out.  In this paper, an analysis of air pressure  effect in a ducting system will be conducted via a development of air pressure prototype. Thousands of experiments are required with regards to a huge number of experiments to be considered. Spesifically a statistical analysis Taguchi Method is used to reduce a number of experiments. Without statistical analysis, 3125 experiments  shall be conducted to identify the air pressure distribution in the ducting system. However, these huge number of experiments are reduced to only 25 experiment by using Taguchi method based on the function of L25 in array orthogonal
Volume: 15
Issue: 1
Page: 27-35
Publish at: 2019-07-01

Optimising the parameters of a RBFN network for a teaching learning paradigm

10.11591/ijeecs.v15.i1.pp435-442
Pamela Chaudhury , Hrudaya Kumar Tripathy
Academic performance of students has been a concern worldwide. Despite efforts made by educational institutions there has been a rise in poor academic performance. In our research study we have proposed a model to pre-determine the academic performance of students using a Radial Basis Function network (RBFN) using primary data. The proposed model has been developed by using algorithms like differential evolution (DE) and teaching learning based optimization (TLBO). This model can be used by academic institutions to identify the academically weaker students and take preventive steps to reduce the number of academic failures.
Volume: 15
Issue: 1
Page: 435-442
Publish at: 2019-07-01

Compilation of malay criminological terms from online news

10.11591/ijeecs.v15.i1.pp355-364
Joanna Chiew Ling Lee , Phoey Lee Teh , Sian Lun Lau , Irina Pak
A Malay language corpus has been established by the Institute of Language and Literature (Dewan Bahasa dan Pustaka, DBP in Malaysia). Most of the past research on the Malay language corpus has focused on the description, lexicography and translation of the Malay language. However, in the existing literature, there is no list of Malay words that categorizes crime terminologies. This study aims to fill that linguistic gap. First, we aggregated the most frequently used crime terminology words from Malaysian online news sources. Five hundred crime-related words were compiled. No automatic machines were in the initial process, but they were subsequently used to verify the data. Four human coders were used to validate the data and ensure the originality of the semantic understanding of the Malay text. Finally, major crime terminologies were outlined from a set of keywords to serve as taggers in our solution. The ultimate goal of this study is to provide a corpus for forensic linguistics, police investigations, and general crime research. This study has established the first corpus of a criminological text in the Malay language.
Volume: 15
Issue: 1
Page: 355-364
Publish at: 2019-07-01
Show 1271 of 1984

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