Articles

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

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

31,456 Article Results

Robust optmized control of multi levels STATCOM

10.11591/ijeecs.v16.i3.pp1203-1212
Tedjini Hamza , Messaoud Fatima Zahra , Kadri Boufeldja
Reactive power compensation is an essential part of a power system and the static synchronous compensator (STATCOM) plays an important role in controlling the reactive power flow over the transmission line. The basic building block of the STATCOM is a voltage source inverter (VSI) that generates a synchronous sinusoidal voltage and because of the high MVA ratings, it would be expensive to provide independent, equal, regulated dc voltage sources to power the multilevel converters which are presently proposed for STATCOMs. Dc voltage sources can be derived from the dc link capacitances which are charged by the rectified ac power. In this paper a new stronger control combined of nonlinear control based Lyapunov’s theorem and Ant Colony Algorithm (ACA) to maintain stability of multilevel STATCOM and the utility.
Volume: 16
Issue: 3
Page: 1203-1212
Publish at: 2019-12-01

Multimedia physics practicum reflective material based on problem solving for science process skills

10.11591/ijere.v8i4.20258
Wawan Kurniawan , Darmaji Darmaji , Astalini Astalini , Dwi Agus Kurniawan , M Hidayat , Nugroho Kurniawan , Linda Zaenati Nur Farida
Purpose: This study aims to determine the differences in science process skills in each class in the Physics Education Study Program. Methodology: This research is a quantitative study with a comparison design. The research sample used amounted to 108 students with details of 54 control class students who used conventional guidebooks, while the control class totaling 54 students used a science process skill guide. The research data was obtained from observation activities using observation sheets of science process skills which were analyzed using descriptive statistics and inferential statistics. Finding: The results showed that there were significant differences in the mastery of science process skills of students seen from the value of the average mastery of science process skills of students using guidebooks based on science process skills. The experimental class has an average science process skill that is better than the control class.
Volume: 8
Issue: 4
Page: 590-595
Publish at: 2019-12-01

Optimal location and sizing of DG and D-STATCOM in distribution networks

10.11591/ijeecs.v16.i3.pp1107-1114
Surender Reddy Salkuti
The main aim of this paper is to determine optimal locations and sizing of Distributed Generations (DGs) and Distribution STATic COMpensator (D-STATCOM) in the distribution network for reducing the system losses and to improve the voltage profile. In this paper, the loss sensitivity factor approach is used to determine optimal location for DG and voltage stability index is used to determine optimal location for D-STATCOM. The objective of proposed optimization problem is to minimize the total real power losses in the system while satisfying several equality and inequality constraints. Artificial fish swarm optimization algorithm (AFSOA) is used to determine the optimal size of DG and D-STATCOM. The simulations are performed on standard 33 bus and 69 bus radial distribution systems and the obtained  results show the feasibility and effectiveness of proposed approach.
Volume: 16
Issue: 3
Page: 1107-1114
Publish at: 2019-12-01

Optimal operation management of grid-connected microgrids under uncertainty

10.11591/ijeecs.v16.i3.pp1163-1170
Surender Reddy Salkuti
This paper proposes a new optimal operation of Microgrids (MGs) in a distribution system with wind energy generators (WEGs), solar photovoltaic (PV) energy systems, battery energy storage (BES) systems, electric vehicles (EVs) and demand response (DR). To reduce the fluctuations of wind, solar PV powers and load demands, the BES systems and DR are utilized in the proposed hybrid system. The detailed modeling of WEGs, solar PV units, load demands, BES systems and EVs has been presented in this paper. The objective considered here is the minimization of total operating cost of microgrid, and it is formulated by considering the cost of power exchange between the main power grid and microgrid, cost of wind and solar PV energy systems, cost of BES systems, EVs and the cost due to the DR in the system. Simulations are performed on a test microgrid, and they are implemented using GAMS software. Various case studies are performed with and without considering the proposed hybrid system.
Volume: 16
Issue: 3
Page: 1163-1170
Publish at: 2019-12-01

Progression approach for image denoising

10.12928/telkomnika.v17i6.12408
Bilal; Universiti Malaysia Perlis (UniMAP) Charmouti , Ahmad Kadri; Universiti Malaysia Perlis (UniMAP) Junoh , Mohd Yusoff; Universiti Malaysia Perlis (UniMAP) Mashor , Najah; Universiti Malaysia Perlis (UniMAP) Ghazali , Mahyun Ab; Universiti Malaysia Perlis (UniMAP) Wahab , Wan Zuki Azman; Universiti Malaysia Perlis (UniMAP) Wan Muhamad , Zainab; Universiti Malaysia Perlis (UniMAP) Yahya , Abdesselam; International Islamic University Malaysia Beroual
Removing noise from the image by retaining the details and features of this treated image remains a standing challenge for the researchers in this field. Therefore, this study is carried out to propose and implement a new denoising technique for removing impulse noise from the digital image, using a new way. This technique permits the narrowing of the gap between the original and the restored images, visually and quantitatively by adopting the mathematical concept ''arithmetic progression''. Through this paper, this concept is integrated into the image denoising, due to its ability in modelling the variation of pixels’ intensity in the image. The principle of the proposed denoising technique relies on the precision, where it keeps the uncorrupted pixels by using effective noise detection and converts the corrupted pixels by replacing them with other closest pixels from the original image at lower cost and with more simplicity.
Volume: 17
Issue: 6
Page: 2948-2958
Publish at: 2019-12-01

Automatic image slice marking propagation on segmentation of dental CBCT

10.12928/telkomnika.v17i6.13220
Agus Zainal; Institute Technology Sepuluh November Arifin , Evan; Institute Technology Sepuluh November Tanuwijaya , Baskoro; Institute Technology Sepuluh November Nugroho , Arif Mudi; Institute Technology Sepuluh November Priyatno , Rarasmaya; Institute Technology Sepuluh November Indraswari , Eha Renwi; Airlangga University, Surabaya, Indonesia Astuti , Dini Adni; Institute Technology Sepuluh November Navastara
Cone Beam Computed Tomography (CBCT) is a radiographic technique that has been commonly used to help doctors provide more detailed information for further examination. Teeth segmentation on CBCT image has many challenges such as low contrast, blurred teeth boundary and irregular contour of the teeth. In addition, because the CBCT produces a lot of slices, in which the neighboring slices have related information, the semi-automatic image segmentation method, that needs manual marking from the user, becomes exhaustive and inefficient. In this research, we propose an automatic image slice marking propagation on segmentation of dental CBCT. The segmentation result of the first slice will be propagated as the marker for the segmentation of the next slices. The experimental results show that the proposed method is successful in segmenting the teeth on CBCT images with the value of Misclassification Error (ME) and Relative Foreground Area Error (RAE) of 0.112 and 0.478, respectively.
Volume: 17
Issue: 6
Page: 3218-3225
Publish at: 2019-12-01

Survey of part-of-speech tagger for mixed-code Indian and foreign language used in social media

10.11591/ijaas.v8.i4.pp264-268
Bhushan Ashokrao Nikam
Part-Of-Speech Tagger (POS Tagger) is a tool that scans the text in specific language and allocates chunks of speech to individual word (and another token), such as verb, adjective, nown etc., as more fine-grained POS tags are used in computational applications like 'noun-plural'. Basically, the goal of a POS tagger is to allocate linguistic (mostly grammatical) information to sub-sentential units, called tokens as well as to words and symbols (e.g. punctuation). This paper presents a survey of POS  Tagger used for code-Mixed Indian and Foreign languages. Various methods, procedures, and features required to device POS Tagger for code-mixed foreign languages especially for Indian are studied and observations related to it are reported.
Volume: 8
Issue: 4
Page: 264-268
Publish at: 2019-12-01

Developing a wireless real-time automated home approach utilizing NI MyRIO microcontroller board and LabVIEW platform

10.11591/ijeecs.v16.i3.pp1273-1278
Ahmad A. Alahmadi
In this paper, a design process and a hardware implementation for a wireless real-time home automation system approach based on NI MyRIO microcontroller board and LabVIEW platform has been developed. The proposed automated system has two hardware elements: the first one is a personal computer as a system main server hosting the designed LabVIEW platform and the second element is a NI MyRIO microcontroller board for managing the operating between the appliances and the sensors. The appliances can be automatically monitored, controlled, and accessed in response to the signals from the related sensors or manually by the system end-user through smart phone based on Wi-Fi and cloud computing technology. To approve the reliability of the proposed automated system, a hardware realization for three appliances: temperature management, light energy saving, and biometric security system of face recognition with fingerprint check has been introduced. The proposed system has a simple structure, economically cost effective and flexible scaling up for a proper automated home future.
Volume: 16
Issue: 3
Page: 1273-1278
Publish at: 2019-12-01

Design of a CMOS-based microwave active channelized bandpass filter

10.12928/telkomnika.v17i6.11662
Jarjar; Faculty of Sciences and Technology (FST)-Signals, Systems and Components laboratory (LSSC) Mariem , Pr. El Ouazzani; Faculty of Sciences and Technology (FST)-Signals, Systems and Components laboratory (LSSC) Nabih
A two-branch microwave active bandpass filter is designed through the channelized filtering technique as well as the transversal concept. Both the main and the auxiliary branches, connected without power dividers/combiners, rely on C-coupled active third order Chebyshev bandpass filters. A lumped element signal delay circuit is also introduced in the main channel. Active inductors based on the gyrator-C topology, are involved in the Chebyshev filters’ structure. CMOS-based Operational Transconductor Amplifier (OTA) circuits are the building blocks of these inductors. The proposed active transversal channelized filter produces an elliptic narrow band response, centered at 1.13 GHz. Simulation results, obtained by means of the PSPICE code according to the 0.18 μm TSMC MOS technology, indicate excellent performances illustrating good impedance matching, low insertion losses and high selectivity. Finally, the noise analysis shows that the filter has a low noise figure in the bandwidth.
Volume: 17
Issue: 6
Page: 2851-2859
Publish at: 2019-12-01

A novel model for solar radiation prediction

10.12928/telkomnika.v17i6.12729
Ibrahim S.; Kano University of Science and Technology Madugu , B. J.; University of Ilorin Olufeagba , Yinusa A.; University of Ilorin Adediran , F.; Kano University of Science and Technology Abdulkadir , A.; Ahmadu Bello University Zaria Abdulkarim , James U.; University of Ilorin Inaku , A. U.; Hussiani Adamu Federal Polytechnic Lawan
Energy for fulfilling basic community/individual needs has come to constitute the first article of expectation in all contemporary societies. The exploitation of renewables notably solar in electricity generation has brought relief to the fulfilment of energy demand especially among susceptible communities. In this paper yearly minimum solar radiation of Kano (12.05°N; 08.2°E; altitude 472.5 m; 3 air density 1.1705 kg/m3) for 46 years is used to generate a prediction model that fits the data using autoregressive moving average (ARMA) and a new model termed autoregressive moving average process (ARMAP). Comparison between the ARMA and ARMAP models showed a tremendous improve in the sum of square error reduction between the actual data and the forecasted data by 47%.
Volume: 17
Issue: 6
Page: 3100-3109
Publish at: 2019-12-01

Predictive analytics of university student intake using supervised methods

10.11591/ijai.v8.i4.pp367-374
Muhammad Yunus Iqbal Basheer , Sofianita Mutalib , Nurzeatul Hamimah Abdul Hamid , Shuzlina Abdul-Rahman , Ariff Md Ab Malik
Predictive analytics extract important factors and patterns from historical data to predict future outcomes. This paper presents predictive analytics of university student intake using supervised methods. Every year, universities face a lot of academic offer rejection by the applicants. Hence, this research aims to predict student acceptance and rejection towards academic offer given by a university using supervised methods subject to past student intake data. To solve this problem, a lot of past studies had been reviewed starting from nineties era till now. From the analysis, two algorithms had been selected namely Decision Tree and k Nearest Neighbor. The dataset of past student intake was obtained with fifteen attributes, which are applicants’ gender, applicants studied stream during Sijil Peperiksaan Malaysia (SPM), university campuses, applicants’ hometown, disability, campus visit, course choice order in application form, applicant’s six SPM subjects result, orphan and status of acceptance. Several experiments were implemented to find the best model to predict the student’s offer acceptance by evaluating the model accuracy. Both models yield best accuracy at 66 percent with the selected attributes. This research gives a huge impact in selecting which applicants is suitable to be offered as well as adapting the university’s academic offering process in much intelligence way in the future.
Volume: 8
Issue: 4
Page: 367-374
Publish at: 2019-12-01

A fuzzy micro-climate controller for small indoor aeroponics systems

10.12928/telkomnika.v17i6.12214
Bambang Dwi; Universitas Brawijaya Argo , Yusuf; Universitas Brawijaya Hendrawan , Ubaidillah; Universitas Brawijaya Ubaidillah
The Indonesian agricultural sector faces challenges producing affordably priced food using sustainable practices. A soilless cultural practice, such as indoor aeroponics, is a compelling alternative to conventional agriculture. The objective of the present study was to develop a system for micro-climate management in a pilot-scale indoor aeroponics system. For this purpose, three fuzzy logic controllers were developed and evaluated to maintain plant chamber parameters (temperature, relative humidity, and light intensity) at desired set points controlled by embedded system controls designed using BASCOM-AVR software. The results showed that the fuzzy controllers provided excellent responses and experienced relatively low errors in all controlled parameters. All parameters changes followed the set point very smoothly and responded accordingly.The averaged percent of working times in which temperature, relative humidity, and light intensity were maintained within less than ±1°C, ±5%, and ±30 lux from the set points were found to be 88.43%, 95.91%, and 85.51%, respectively.
Volume: 17
Issue: 6
Page: 3019-3026
Publish at: 2019-12-01

Study the effect of thin film thickness on the optical features of (IR5 laser dye/CdSe nanoparticles) samples

10.12928/telkomnika.v17i6.13004
Mithaq M.; Kufa University Mehdy Al-Sultani
The linear optical features such as (transmittance T, absorbance A, the effective length 𝐿𝑒𝑓𝑓, absorption coefficient 𝛼 and refractive index 𝑛 ) for the thin films samples of (3x10-3 mol/l of (IR5) laser dye, 0.02 gm of (CdS) nanoparticles and 0.04 gm of pp polymer) had been studied at different values of film thickness in one time and at different number of Yb:GdVO4 laser pulses. The non-linear optical features in terms of transmittance difference Δ𝑇𝑝−𝑣, non-linear refractive index 𝑛2, non–linear phase shift Δ𝛷𝑜 non-linear absorption coefficient 𝛽 and minimum normalized transmittance 𝑇(𝑍) have been computed in relation to obtained normalized transmittance data from setup of Z-scan with open and closed apertures, calculated for (3x10-3 mol/l of (IR5) laser dye, 0.02 gm of (CdSe) nanoparticles and 0.04 gm of (pp) polymer) thin films at different values of film thickness at in one time and at different Yb:GdVO4 laser pulses. Thick films causes in deleting the non-linear effects generated by different layers. The (CdSe) nanoparticles leads to an absorption shifting of the wavelengths to lengthier wavelengths of red shift. So, this can be used in selecting the nanoparticles and medium with applicable exciting wavelengths. The film thickness and the laser pulses have the main effects in consolidating the Non-linear optical features.
Volume: 17
Issue: 6
Page: 2877-2884
Publish at: 2019-12-01

Streaming in-patient BPM data to the cloud with a real-time monitoring system

10.12928/telkomnika.v17i6.13263
Mohammed G.; Northern Technical University Ayoub , Mazin N.; Northern Technical University Farhan , Mohamme S.; Northern Technical University Jarjees
Monitoring the heart activities for old people or people with medical history (Arrhythmia or CHD) is targeted by most new medical technologies. This paper demonstrated an in-patient real-time monitoring system for heart rate estimation. A ratio of beats per minute (BPM) is continuously recorded, streamed and archived to the cloud via WeMos WiFi development board. This cost effective system is simply based on two sub-systems: BPM data acquisition through pulse sensor and WeMos-based communication systems. The streamed BPM data are saved instantaneously in Google drive as spreadsheets which can only be accessed by authorized persons wherever the internet service is available. Thus, the person in charge can remotely observe the patient’s status and do analytics for the archived data. A pilot study with eight subjects was carried out to validate the developed BPM tele-monitoring system. Encouraging results have been achieved.
Volume: 17
Issue: 6
Page: 3120-3125
Publish at: 2019-12-01

Parallelism in web services: design of parallel XML parser for web services

10.11591/ijeecs.v16.i3.pp1407-1415
Rohitkumar Rudrappa Wagdarikar , Sandhya P
A WS provides the communication between heterogeneous systems. While performing this operation, we need to focus on QoS of consumer, provider and registry directory. There will be some parameters like WS selection, prediction and rank these are parameters need to consider while QoS implementation in web services. While performing integration in web services we need to focus on QoS requirements regarding server and network performance. Performance of WS is related to locations i.e the network distance and the Internet connections between consumer and provider. There will be more QoS approach which works on consumers collected QoS data, based on this data system can predict the QoS of WS. Throughput and response time are the QoS of WS. In this paper, we have proposed parallel XML parser, by which we can parse UDDI, WSDL and SOAP XML files parallel by which it will improve the response time and throughput of WS.
Volume: 16
Issue: 3
Page: 1407-1415
Publish at: 2019-12-01
1 2 3
...
2097 2098
Show 1324 of 2098

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