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

29,758 Article Results

An Electromagnetism-like Mechanism Algorithm Approach for Photovoltaic System Optimization

10.11591/ijeecs.v12.i1.pp333-340
Jian Ding Tan , Siaw Paw Koh , Sieh Kiong Tiong , Kharudin Ali , Ying Ying Koay
Solar energy has become one of the most studied topic in the field of renewable energy. In this paper, an artificial intelligent approach is proposed for the optimization of a photovoltaic solar energy harvesting system. An Electromagnetism-Like Mechanism Algorithm (EM) has been developed to search for the hourly optimum tilt angles for photovoltaic panels. In order to investigate the effect of the search step size on the efficiency and overall accuracy of the algorithm, the EM has also been modified into several variants with different search step size settings. Experimental findings show that EM with bigger search lengths has the advantage of reaching a near optimum tilt angle in earlier iterations but less accurate. EM with smaller step lengths, on the other hand, can hit a relatively more optimum tilt angle in the process. During the peak of the power generation at noon, EM with smaller search stes found an optimum tilt angle which yielded additional 3.17W of power compared to a fixed panel. We thus conclude that the proposed EM performs well in optimizing the tilt angle of a photovoltaic solar energy harvesting system.
Volume: 12
Issue: 1
Page: 333-340
Publish at: 2018-10-01

Techno-economic Analysis of Solar-powered Lighting of Bali above Seawater Toll-Road

10.12928/telkomnika.v16i5.7056
NM; Udayana University Karmiathi , INS; Udayana University Bali Kumara , WG; Udayana University Ariastina , IW; PT. Indosat, Tbk Gunarta
The objective of this studywas to obtain atechnical and economic analysis of solar-powered lighting (SPL) implementation at Bali above Seawater Toll-Road. The SPL was designed to operate 12Hours/day with average illumination ≥15-lux. Those requirements can be met byan SPL unit that consists of 2-pieces 87-W LED lights mounted on 10-m double arms pole with 2.37-m arm length and 15º tilt angle. Each LED light was powered by a 260-Wp solar panel, 24V-180AH battery and 10-A solar charge controller. Every SPL unit should be installed on the toll-road median with 22.5-m pole-spacing and required 361-units to illuminate throughout 8,122.5-m toll-road length. Benefits of SPL implementation wereelectricity saving 256.15MWh/yr and carbon emission reduction 217.98TonesCO2/yr. However, the SPL electrical-based costwas 3.9 times more expensive than conventionalstreet lighting. And based onthe investment feasibility analysis using NPI and PI techniques showed that the SPL implementation was not feasible.
Volume: 16
Issue: 5
Page: 2342-2354
Publish at: 2018-10-01

Randomize IPv6 Stateless Address Autoconfiguration in None-stable Storage Arduino Devices

10.11591/ijeecs.v12.i1.pp254-260
Zolidah Kasiran , Rizaki Napi
The pervasiveness of IoT device requires each device to have a unique address number in order to communicate. Internet Standard specified in RFC4941-Privacy Extension for SLAAC had question raised on the randomness of the IPv6 address generated due to the shortcoming of device random generator algorithm. Improvements to the RFC’s have been proposed and Arduino Uno had been selected as IoT platform since it currently supports IPv6 implementation. An enhancement algorithm was developed. The generated IPv6 address is then tested against ENT Random Test tool for observation and conclusion.
Volume: 12
Issue: 1
Page: 254-260
Publish at: 2018-10-01

Novel Design of a Magnetically Switchable MOSFET using Magnetoresistive Elements

10.12928/telkomnika.v16i5.9539
Chinmay Vilas; SRM Institute of Science & Technology Samak , Tanmay Vilas; SRM Institute of Science & Technology Samak
Various research activities have been carried out, individually, in the fields of MOSFET design andanalysis, and magnetoresistance; however, ourresearch focused on the design and analysis of a magnetically switchable MOSFET with the application of magnetoresistive elements. Theoretical study, calculations and simulations were used in order to design and analyze the magnetically switchable MOSFET. It was observed that the magnetoresistance values of 42%, 81% and 95%, respectively, for giant magnetoresistive element, tunneling magnetoresistive element and colossal magnetoresistive element resulted in reduced resistance values of 139.2Ω, 45.6Ω and 12Ω across the MOSFET in presence of magnetic field; as compared to a higher value of 240Ω in its absence. As a consequence, the gate-source voltage increased beyond the threshold value (1.5V), and the MOSFET switched ON. Accordingly, a magnetically switchable MOSFET was designed and its behavioural characteristics were analyzed.
Volume: 16
Issue: 5
Page: 2233-2238
Publish at: 2018-10-01

Neighbor Weighted K-Nearest Neighbor for Sambat Online Classification

10.11591/ijeecs.v12.i1.pp155-160
Annisya Aprilia Prasanti , M. Ali Fauzi , Muhammad Tanzil Furqon
Sambat Online is one of the implementation of E-Government for complaints management provided by Malang City Government.  All of the complaints will be classified into its intended department. In this study, automatic complaint classification system using Neighbor Weighted K-Nearest Neighbor (NW-KNN) is poposed because Sambat Online has imbalanced data. The system developed consists of three main stages including preprocessing, N-Gram feature extraction, and classification using NW-KNN. Based on the experiment results, it can be concluded that the NW-KNN algorithm is able to classify the imbalanced data well with the most optimal k-neighbor value is 3 and unigram as the best features by 77.85% precision, 74.18% recall, and 75.25% f-measure value. Compared to the conventional KNN, NW-KNN algorithm also proved to be better for imbalanced data problems with very slightly differences.
Volume: 12
Issue: 1
Page: 155-160
Publish at: 2018-10-01

Real-time Multi-object Face Recognition Using Content Based Image Retrieval (CBIR)

10.11591/ijece.v8i5.pp2812-2817
Muhammad Fachrurrozi , Saparudin Saparudin , Erwin Erwin , Mardiana Mardiana , Clara Fin Badillah , Junia Erlina , Auzan Lazuardi
Face recognition system in real time is divided into three processes, namely feature extraction, clustering, detection, and recognition. Each of these stages uses different methods, Local Binary Pattern (LBP), Agglomerative Hierarchical Clustering (AHC) and Euclidean Distance. Multi-face image search using Content Based Image Retrieval (CBIR) method. CBIR performs image search by image feature itself. Based on real time trial results, the accuracy value obtained is 61.64%.  
Volume: 8
Issue: 5
Page: 2812-2817
Publish at: 2018-10-01

A Simulation of Energy Recycling Concept in Automotive Application Using Hybrid Approach

10.11591/ijeecs.v12.i1.pp412-419
Noor Azah Samsudin , Muhammad Syariff Aripin , Shamsul Kamal Ahmad Khalid , Nor Amirul Amri Nordin
This paper presents development of a simulation to demonstrate a relatively new hybrid approach in improving energy resources that is applicable in automotive industry. The existing hybrid approach in automotive industry is considerably efficient in terms of energy saving by switching between fuel and electricity for energy resources. However, both energy resources confront various challenges. While the electricity resources require recharging, the fuel resources are scarce and expensive. Therefore, in this paper we aim to propose a relatively new hybrid approach, referred to as energy recycling concept equipped with coordination algorithm. To simulate the proposed energy recycling concept, a prototype of Electrical Control Unit (ECU) car is built. Then, an algorithm that coordinates battery charging is developed and integrated with the ECU. Finally, the simulation of the proposed energy recycling concept equipped with the coordination algorithm is evaluated on the prototype of the ECU car. The results show that the proposed energy recycling concept that allows switching between two sources of energy is applicable to operate the ECU car prototype. 
Volume: 12
Issue: 1
Page: 412-419
Publish at: 2018-10-01

Detection Hand Motion on Virtual Reality Mathematics Game with Accelerometer and Flex Sensors

10.12928/telkomnika.v16i5.7594
Erdhi Widyarto; Soegijapranata Catholic University Nugroho , T. Brenda; Soegijapranata Catholic University Chandrawati
Montessori method is a learning method using props. One of the developments props is to use the game as a medium of learning. The examples Game media as learning is the use of Virtual Reality or VR Technology. By using the VR, players will be brought into the virtual world as if the player is in the real world. The weakness of the VR game is the limited interaction with the outside world. Interaction uses only buttons and joysticks. In this paper we use Flex sensor and accelerometer sensor to detect hand movements for VR mathematic game. The result is VR games are more interactive and interesting with hand motion.
Volume: 16
Issue: 5
Page: 2287-2292
Publish at: 2018-10-01

Comparison between Trigonometric, and traditional DDS, in 90 nm technology

10.12928/telkomnika.v16i5.9832
Cardarilli Gian; University of Rome Tor Vergata Carlo , Di Nunzio; University of Rome Tor Vergata Luca , Fazzolari; University of Rome Tor Vergata Rocco , Giardino; University of Rome Tor Vergata Daniele , Matta; University of Rome Tor Vergata Marco , Nannarelli; Technical University Alberto , Re; University of Rome Tor Vergata Marco , Silvestri; University of Rome Tor Vergata Francesca , Spanò; University of Rome Tor Vergata Sergio
The Direct Digital frequency Synthesizer (DDS) is an architecture largely used for the generation of numeric sine and/or cosine waveforms in different applications. In this work, authors compare two different DDS architectures: the traditional architecture, based on the exploitation of quarter wave symmetry, and the Symon’s DDS (trigonometric DDS) presented in 2002. The two layout configurations have been implemented in 90 nm technology and compared in terms of area, speed and power consumption. Comparisons have been performed in terms of circuital complexity on architectures having the same Spurious Free Dynamic Range (SFDR) and phase resolution. Experiments show that the trigonometric architecture is very efficient in terms of area.
Volume: 16
Issue: 5
Page: 2245-2253
Publish at: 2018-10-01

Probabilistic Performance Index based Contingency Screening for Composite Power System Reliability Evaluation

10.11591/ijece.v8i5.pp2661-2670
Venkata Satheesh Babu K , Madhusudan V , Ganesh V
Composite power system reliability involves assessing the adequacy of generation and transmission system to meet the demand at major system load points. Contingency selection was being the most tedious step in reliability evaluation of large electric systems. Contingency in power system might be a possible event in future which was not predicted with certainty in earlier research. Therefore, uncertainty may be inevitable in power system operation. Deterministic indices may not guarantee the randomness in reliability assessment. In order to account for volatility in contingencies, a new performance index proposed in the current research. Proposed method assimilates the uncertainty in computational procedure. Reliability test systems like Roy Billinton Test System-6 bus system and IEEE-24 bus reliability test systems were used to test the effectiveness of a proposed method.
Volume: 8
Issue: 5
Page: 2661-2670
Publish at: 2018-10-01

The Design of Capacitive Slit on Improving the Antenna Gain of Binomial Double Strip Hexacula Omnidirectional Broadband Antenna

10.12928/telkomnika.v16i5.8669
Syahrial; Syiah Kuala University Syahrial , Safwan; Politeknik Aceh Banda Aceh Safwan , Rizal; Syiah Kuala University Munadi , Roslidar; Syiah Kuala University Roslidar
The capacitive slit is a method of making the impedance value to be resistive. To achieve this goal is a challenge in addition to the slit antenna and gives impact to gain as one of the important parameters in antenna design. The antenna gain in a particular direction is defined as 4π times the ratio of radiation intensity in that direction to the power received by the transmitter antenna. In this research, the proposed capacitive slit method was tested on the hexacula omnidirectional broadband antenna operating on frequency 0.85-3 GHz and gain 4.8 dBi. The testing was conducted to obtain the gain improvement of the hexacula omnidirectional broadband antenna. The placement of the capacitive slit was implemented on double strip antenna with 4 times experiments. The best experiment result was obtained when three capacitive slits were placed on different strips. The capacitive slit was designed by analyzing the average value of input impedance before calculating the dimension of the capacitive slit that applied to the antenna. The experiment result shows that the best value of antenna gain is 7.19 dBi. The gain increment is linear to the number of capacitive slits applied to the antenna.
Volume: 16
Issue: 5
Page: 2032-2039
Publish at: 2018-10-01

An Experimental Study of Weibull and Rayleigh Distribution Functions of Wind Speeds in Kosovo

10.12928/telkomnika.v16i5.10260
Bukurie; University of Pristina Hoxha , Rexhep; University of Pristina Selimaj , Sabrije; University of Pristina Osmanaj
This paper compares two commonly used functions, the Weibull and Rayleigh distribution functions, for fitting a measured wind speed probability distribution at a given location over a certain period. The monthly and annual measured wind speed data at 84 m height for the years have been statistically analyzed for the country with a large capacity - Kitka. The analysis is made in the case of the implementation of all the predicted capacity of wind turbines and by virtue of the probability of power distribution. The Weibull and Rayleigh probability distribution functions have been determined and their parameters have been identified. The average wind speed and the wind power density have been estimated using both distribution functions and compared those estimated from the measured probability distribution function. The Weibull distribution function fits the wind speed variation better than Rayleigh distribution function. The average wind speed was found to be 4.5 m/s and the average wind power density was 114.54 W/m According to results, we can conclude that such a distribution of winds in this region yields an appropriate average value of wind power.
Volume: 16
Issue: 5
Page: 2451-2457
Publish at: 2018-10-01

Hadoop Security Challenges and Its Solution Using KNOX

10.11591/ijeecs.v12.i1.pp107-116
Sirisha N , Kiran K V D , R Karthik
Big Data is a new technology and architecture. It can work on a very large volume of a variety of data with high-velocity, discovery, and/or analysis. Big Data is about the fast-growing sources of data such as web logics, Sensor networks, Social media, Internet text and documents, Internet pages, Search Index data, scientific research. Big data also formally introduces a complex range of analysis. Big data can evaluate mixed data (structured and unstructured) from multiple sources. As there are some security issues in big data which are no longer solved using the hashing techniques on large amount of data, this paper shows an idea of new approach of designing a Knox’ified Hadoop cluster.
Volume: 12
Issue: 1
Page: 107-116
Publish at: 2018-10-01

Data Communication in Internet of Things: Vision, Challenges and Future Direction

10.12928/telkomnika.v16i5.9402
Jammel; University of Kufa Iraq Mona
Ubiquitous technologies based heterogeneous networks has opened a new paradigm of technologies, which are enabled with various different objects called Internet of things (IoT). This field opens new door for innovative and advance patterns with considerable potential advantages in the shape of plethora of monitoring and infotainment applications around us. Data communication is one of the significant area of research in IoT due to its diverse network topologies, where diverse gadgets and devices have integrated and connected with each other. In order to communicate among devices and users, routing should be relible, secure and efficient. Due to diverse and hetrogenous netwok environment, the most of the existing routing solutions do not provide all quality of services requirement in the network. In this paper, we discuss the existing routing trend in IoT, vision and current challenges. This paper also elaborates the technologies and domains to drive this field for future perspectives. The paper concludes with discussion and main points for new researchers in terms of routing to understand about current situation in IoT.
Volume: 16
Issue: 5
Page: 2057-2062
Publish at: 2018-10-01

Compact Photonic Transmitter Based on Annular Ring Antenna for THz Applications

10.12928/telkomnika.v16i5.10647
Ibtissame; University of Sciences Hassan 1St University of Settat Moumane , Jamal; University of Sciences Hassan 1St University of Settat Zbitou , Ahmed; University of Sciences Hassan 1St University of Settat Errkik , Larbi El; University of Sciences Hassan 1St University of Settat Abdellaoui , Abdelali; University of Sciences Hassan 1St University of Settat Tajmouati , Mohamed; Microwave groupe ESEO Latrach
This paper presents the design of Continuous Wave Terahetz photonic transmitters based on photodector which convert the light signal to electrical signal, THz antenna, low-pass filter (LPF) and DC Probe. In the design of the CW THz photonic transmitter System, we begin with the matching input impedance and validation of THz antenna using an EM solver Momentum integrated in ADS “Advanced Design System”. Then we pass to the optimization of a low-pass filter which had the role of inductance, blocking the RF signal providing from the antenna to reach the DC probe. Finally, we associate the previous structures with a DC probe and simulate the whole circuit until validating the CW THz photonic transmitter circuit. The three structures are based on multi-layers GaAs substrate, which is the most widely used for THz circuit design. The dimensions of the whole circuit are 819.071 × 164.10 𝜇𝑚2.
Volume: 16
Issue: 5
Page: 2474-2480
Publish at: 2018-10-01
1 2 3
...
1983 1984
Show 1386 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