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

31,377 Article Results

Simulation of 3-phase matrix converter using space vector modulation

10.11591/ijece.v9i2.pp909-916
K. Selvakumar , R. Palanisamy , Arul Rayappan Stalin , P. Gopi , P. Ponselvin , K. Saravanan
This paper illustrates the simulation of 3-phase matrix converter using Space Vector Modulation (SVM). Variable AC output voltage engendered using matrix converter with bidirectional power switches controlled by appropriate switching pulse. The conventional PWM converter engenders switching common mode voltage across the load system terminals, which cause to common mode current and its leads to bearing failure in load drive. These problems can be rectified using SVM and which minimize the effect on the harmonic fluctuation in AC output voltage and stress on the power switch is reduced using bidirectional switch for proposed 3-phase matrix converter. The simulation results have been presented to validate the proposed system using matlab / simulink.
Volume: 9
Issue: 2
Page: 909-916
Publish at: 2019-04-01

State-space averaged modeling and transfer function derivation of DC-DC boost converter for high-brightness led lighting applications

10.12928/telkomnika.v17i2.10272
Muhammad Wasif; Universiti Teknologi PETRONAS Umar , Norzaihar; Universiti Teknologi PETRONAS Yahaya , Zuhairi; Universiti Teknologi PETRONAS Baharudin
This paper presents dynamic analysis of a boost type DC-DC converter for high-brightness LED (HBLED) driving applications. The steady state operation in presence of all system parasitics has been discussed for continuous conduction mode (CCM). The state-space averaging, energy conservation principle and standard linearization are used to derive ac small signal control to inductor current open-loop transfer function of the converter. The derived transfer function can be further used in designing a robust feed-back control network for the system. In the end frequency and transient responses of the derived transfer function are obtained for a given set of component values, hence to provide a useful guide for control design engineers.
Volume: 17
Issue: 2
Page: 1006-1013
Publish at: 2019-04-01

Testbed versus simulation approach on RF communication with AAβ asymmetric encryption scheme on internet of things devices

10.11591/ijeecs.v14.i1.pp353-359
Syed Farid Syed Adnan , Mohd Anuar Mat Isa , Habibah Hashim
The revolution of the Internet of Things (IoT) has given a better way of monitoring things including anything that could gather data and share the information over the internet. Most of the connected things are using Device to Device (D2D) connection to make it available on the internet such as client to a broker or client to a server. However, when IoT devices such as embedded devices and sensors that are connected to the internet, it becomes an open path for attackers to acquire the data and data vulnerably will become an issue. Thus, data integrity might become an issue, or the attackers could temper the data and could cause a disastrous domino effect to the interconnected IoT devices. Therefore, the data security collected from the sensors is substantial even though it could be a single character transmitted. However, IoT sensors are low powered devices in term of CPU, storage, memory and batteries. Securing the devices such as integrating the encryption algorithm computations might give overhead to the sensors and draining the batteries even faster than it is predicted. Alternatively, this paper attempts to explore the capabilities of the asymmetric scheme on resource constrained devices for its communications. Thus, this paper presents an RF communication analysis of a low consumption asymmetric encryption, the AAβ (AA-Beta) especially on encryption section that is likely to be feasible on IoT devices to preserve the data integrity. The design of RF transmission has been considered to suit the RF transceiver capability to prevent data losses and error from occurring. The result shows that 2.35 times of RF transmits runtime increased compared to RF simulation runtime. Meanwhile, at the receiver side, the runtime increases 60% compared to the simulation.
Volume: 14
Issue: 1
Page: 353-359
Publish at: 2019-04-01

Electromagnetic interference shielding in unmanned aerial vehicle against lightning strike

10.12928/telkomnika.v17i2.9029
Diah; Universitas Lampung Permata , Menachem C.; Universitas Lampung Gurning , Yul; Universitas Lampung Martin , Henry B. H.; Universitas Lampung Sitorus , Mona Arif; Universitas Lampung Muda , Herman H.; Universitas Lampung Sinaga
Electromagnetic interference (EMI) due to lightning strike in Unmanned Aerial Vehicle (UAV) became a critical issue, since it could cause a severe damaged to electronic equipment which was installed in UAV. This paper proposed a method to reduce EMI by creating shield over the body of UAV with aluminum foil with thickness 0.15mm. A standard lightning impulse-voltage generated by impulse generator was delivered to the high voltage (HV) electrode at a particular distance from UAV. Indirect effect of lightning strike was investigated by measuring induced voltage inside the compartment of UAV fuselage during flashover between the HV electrode and UAV. Flashover between the HV electrode and UAV simulated the lightning strike. The result showed that the highest voltage only 1V at UAV compartment when 150kV impulse voltage supplied to the electrode with striking area on the wing. The measured voltage was far below 100V as the insulation level of low voltage equipment inside UAV. Although the direct effect of lightning has created a burning hole on the surface aluminum foil with thickness 0.15mm, the effect was overcome by increasing the thickness to 0.3mm. The application of aluminum foil over the surface of UAV repelled the electromagnetic interference which acted as a Faraday cage. The shielding method was successfully reduced the effect of EMI.
Volume: 17
Issue: 2
Page: 915-919
Publish at: 2019-04-01

Prototype of human footstep power generator using ultrasonic sensor

10.12928/telkomnika.v17i2.11751
Giva Andriana; Telkom University Mutiara , Andri Surya; Telkom University Dinata , Anang; Telkom University Sularsa
Nowadays, the human need for electrical energy is getting higher. Due to the declining supply fuel, many efforts have been studied to find renewable energy. One of the studies is building a power generator system that comes from daily human activities. This paper proposes a human footstep power generator using ultrasonic sensor HC-SR04. Only by doing a simply walking on the ground floor, electrical energy can trigger. An HC-SR04 sensor measuring the spring distances from the footstep and activates the motor drive relay and generator that converts mechanical energy into electrical energy and stored in a battery. The test results state that the deeper of a footing step on the floor surface, the greater distance produced and the higher voltage can be generated. The footstep can trigger 7.5 V-8.8 V. Full battery condition can be used to turn on two pieces of 2-watt LED lamps for approximately 5 hours.
Volume: 17
Issue: 2
Page: 937-945
Publish at: 2019-04-01

Spectral coding performance under free space optical medium

10.11591/ijeecs.v14.i1.pp290-294
A.K Rahman , N Julai , M. Jusoh , C.B.M Rashidi , S.A Aljunid , Anuar M.S , M.F Talib , Nurdiani Zamhari , S.K Sahari , K.F. Tamrin , Rudiyanto P. Jong , D.N.A Zaidel , N.A.A Mohtadzar , M.R.M Sharip , Y.S Samat
 This paper focus on performance of code Zero Correlation-Correlation (ZCC) in free space optical communication. The ZCC code has a superior characteristic which eliminate the overlapping code between any users. Due to this high class characteristic, the code improves the performance of the conventional code in free space optical environment. In this paper the analysis performance of bit error rate is considering the avalanche (APD) noise, thermal noise and multiuser interference. The result shows that ZCC code improve the performance of conventional code in term of number of users, power received and data bit rate.
Volume: 14
Issue: 1
Page: 290-294
Publish at: 2019-04-01

A rapid classification of wheat flour protein content using artificial neural network model based on bioelectrical properties

10.12928/telkomnika.v17i2.9450
Sucipto; Universitas Brawijaya Sucipto , Maffudhotul; Universitas Brawijaya Anna , Muhammad; Universitas Brawijaya Arwani , Yusuf; Universitas Brawijaya Hendrawan
A conventional technique of protein analysis is laborious and costly. One rapid method used to estimate protein content is near infrared spectroscopy (NIRS), but the cost is relatively expensive. Therefore, it is necessary to find a cheaper alternative measurement such as measuring the bioelectrical properties. This preliminary study is a new rapid method for classified modeling of wheat flour protein content based on the bioelectrical properties. A backpropagation artificial neural network (ANN) was developed to classify the protein content of wheat flour. ANN input were bioelectrical properties, namely capacitance, and resistance and output was a type of the flour, namely hard, medium and soft flour. The result showed that the ANN model could classify the various type of flour. The best ANN model produces a mean square error (MSE) and regression correlation (R) of 0.0399 and 0.9774 respectively. This ANN model could classify the protein content of wheat flour based on the bioelectrical properties and have the potential to be used as a basic instrument to estimate the protein content.
Volume: 17
Issue: 2
Page: 920-927
Publish at: 2019-04-01

RFID-based conveyor belt for improve warehouse operations

10.12928/telkomnika.v17i2.11767
Syafrial Fachri; Politeknik Pos Indonesia Pane , Rolly Maulana; Politeknik Pos Indonesia Awangga , Bayu Rahmad; Politeknik Pos Indonesia Azhari , Gilang Romadhanu; Politeknik Pos Indonesia Tartila
The Government of the Republic of Indonesia is currently focusing on building logistics infrastructure to facilitate the distribution of logistics to all regions in Indonesia. The Distribution of logistics to each area requires an electronically connected warehouse so that information about goods in the warehouse can be monitored continuously. There are some problems with one of the logistics companies because the existing warehouse management technology is not sufficient enough, so the complex warehouse functions do not become dynamic. One of the solutions to solve the problem need to use RFID technology, conveyor belt, and robotic arm by using an Arduino microcontroller. This research uses Design Science Research Methodology which focuses on developing and improving the model performance of a system and using the prototyping model for system development. The test results state that the built system works well because it could lift, identify and sort goods by type. So, this research could answer the problem that happened at the warehouse.
Volume: 17
Issue: 2
Page: 794-800
Publish at: 2019-04-01

Performance effect of applying paraffin wax on solar photovoltaic backplate

10.11591/ijeecs.v14.i1.pp375-380
E. Roslan , A. Razak
The efficiency of solar photovoltaic (PV) panels is affected by its operating temperature. Having high irradiance produces high electrical output but also heats up the panel and reducing the panels efficiency. This study investigates the effect of cooling solar PV panels using 750g of paraffin wax as phase change material (PCM) applied to the back plate of a solar PV panel. The experiment is done at Kajang, Selangor, Malaysia. The result is reduction of up to 9.5°C, increase of up to 0.947W or 11.82% of electrical power output when compared to the panel without any PCM applied. The panel cooled with PCM also produced 4.69% more energy
Volume: 14
Issue: 1
Page: 375-380
Publish at: 2019-04-01

Auto purchase order system between retailer and distributor

10.12928/telkomnika.v17i2.9948
Teguh; Nusantara PGRI Kediri University Andriyanto , Ary Permatadeny; Nusantara PGRI Kediri University Nevita
Uncertainty of goods inventory often triggers the occurrence of Bullwhip Effect, where there is accumulation of goods on a stage or lack of goods at another stage in the supply chain. Bullwhip Effect is caused by an error in ordering the amount of goods, error in the time of ordering or delivery of goods. The problem can be solved using information sharing. This research utilizing information sharing between two retailers and one distributors used for the ordering process of goods. The process of ordering goods retailers to distributors is done automatically based on sales data retailers. The order quantity is calculated based on the final stock and the maximum stock value of the goods.
Volume: 17
Issue: 2
Page: 660-666
Publish at: 2019-04-01

Low-cost communication system for explorer-class underwater remotely operated vehicle

10.12928/telkomnika.v17i2.11791
Simon; Telkom University Siregar , Muhammad Ikhsan; Telkom University Sani , Muhammad Muchlis; Telkom University Kurnia , Dzikri; Telkom University Hasbialloh
Disaster recovery from underwater earthquake, plane crashes into the sea, and monitoring underwater cables or piping for energy purpose are underwater missions for Remotely Operated Underwater Vehicle (ROV) in ASEAN MATE 2018 Competition. Two essentials factor to perform successfully in this ROV competition are design of an efficient communication protocol system and a low-cost communication hardware. In this research, an optimal communication system between RS-232 serial communication transmission and RS-485 serial communication transmission is developed to obtain the optimal solution. Both communication system is tested in Tech_SAS ROV-Telkom University Indonesia, a microcontroller underwater ROV based which used single microcontroller to control actuator, sensor and communication, and measured the Quality of Services (QoS) for end-to-end delay and packets loss. From the the experiment and evaluation for the two schemes, shows 12.57 ms end-to-end delay, 0% data packet error and $6 RS-485 communication system are the optimal solution for Tech_SAS ROV.
Volume: 17
Issue: 2
Page: 593-600
Publish at: 2019-04-01

Classification of blast cell type on acute myeloid leukemia (AML) based on image morphology of white blood cells

10.12928/telkomnika.v17i2.8666
Wiharto; Universitas Sebelas Maret Wiharto , Esti; Universitas Sebelas Maret Suryani , Yuda Rizki; Universitas Sebelas Maret Putra
AML is one type of cancer of the blood and spinal cord. AML has a number of subtypes including M0 and M1. Both subtypes are distinguished by the dominant blast cell type in the WBC, the myeloblast cells, promyelocyte, and myelocyte. This makes the diagnosis process of leukemia subtype requires identification of blast cells in WBC. Automatic blast cell identification is widely developed but is constrained by the lack of data availability, and uneven distribution for each type of blast cell, resulting in problems of data imbalance. This makes the system developed has poor performance. This study aims to classify blast cell types in WBC identified AML-M0 and AML-M1. The method used is divided into two stages, first pre-processing, image segmentation and feature extraction. The second stage, perform resample, which is continued over sampling with SMOTE. The process is done until the amount of data obtained is relatively the same for each blast cell, then the process of elimination of data duplication, randomize, classification and performance measurement. The validation method used is k-fold cross-validation with k=10. Performance parameters used are sensitivity, specifyicity, accuracy, and AUC. The average performance resulting from classification of cell types in AML with Random Forest algorithm obtained 82.9% sensitivity, 92.1% specificity, 89.6% accuracy and 87.5% AUC. These results indicate a significant improvement compared to the system model without using SMOTE. The performance generated by reference to the AUC value, the proposed system model belongs to either category, so it can be used for further stages of leukemia subtype AML-M0 and AML-M1.
Volume: 17
Issue: 2
Page: 645-652
Publish at: 2019-04-01

Design and implementation of a smart monitoring system for water quality of fish farms

10.11591/ijeecs.v14.i1.pp44-50
Nahla Abdul Jalil Salih , Ihsan Jabbar Hasan , Nadhir Ibrahim Abdulkhaleq
Fish farms are one of the most important sources of profitability for farmers. Therefore, these farms must be cared for and monitored continuously. the paper discuss  a smart system monitoring in a new way that we designed to monitor the quality and temperature of the fish pond’s water. This system has been designed and implemented to measure and monitor the pH and the temperature value of the fish pond’s water in real time. The system is divided into a measuring and monitoring part. The measuring part uses Arduino UNO as a microcontroller to measure the pH and temperature from the sensors. The data is then sent to the second part by Bluetooth. The second part (the monitoring part), is a new  application for smartphone  designed by ‘MIT App Inventor 2’, which monitors the status of the full system. The ‘MIT App Inventor 2’ is a google software (opensource) that enables you to easily build an Android application. The main advantage of this system is its ability to monitor the fish farms from long distances, with low cost and high reliability.
Volume: 14
Issue: 1
Page: 44-50
Publish at: 2019-04-01

Security vulnerabilities related to web-based data

10.12928/telkomnika.v17i2.10484
Mohammed; American University of Ras Al Khaimah Awad , Muhammed; American University of Ras Al Khaimah Ali , Maen; American University of Ras Al Khaimah Takruri , Shereen; American University of Ras Al Khaimah Ismail
In this digital era, organizations and industries are moving towards replacing websites with web applications for many obvious reasons. With this transition towards web-based applications, organizations and industries find themselves surrounded by several threats and vulnerabilities. One of the largest concerns is keeping their infrastructure safe from attacks and misuse. Web security entails applying a set of procedures and practices, by applying several security principles at various layers to protect web servers, web users, and their surrounding environment. In this paper, we will discuss several attacks that may affect web-based applications namely: SQL injection attacks, cookie poisoning, cross-site scripting, and buffer overflow. Additionally, we will discuss detection and prevention methods from such attacks.
Volume: 17
Issue: 2
Page: 852-856
Publish at: 2019-04-01

Voice recognition system for controlling electrical appliances in smart hospital room

10.12928/telkomnika.v17i2.11781
Eva Inaiyah; Universitas Airlangga Agustin , Riky Tri; Universitas Airlangga Yunardi , Aji Akbar; Universitas Airlangga Firdaus
Nowadays, most hospitals have new problem that is lack of medical nurse due to the number of patient increas rapidly. The patient especially with physical disabilities are difficult to control the switch on electrical appliances in patient’s room. This research aims to develope voice recognition based home automation and being applied to patient room. A miniature of patient’s room are made to simulate this system. The patient's voice is received by the microphone and placed close to the patient to reduce the noise.V3 Voice recognition module is used to voice recognition process. Electrical bed of patient is represented by mini bed with utilising motor servo. The lighting of patient room is represented by small lamp with relay. And the help button to call the medical nurse is represented by buzzer. Arduino Uno is used to handle the controlling process. Six basic words with one syllable are used to command for this system. This system can be used after the patient's voice is recorded. This system can recognize voice commands with an accuracy 75%. The accuracy can be improved up to 85% by changing the voice command into two syllables with variations of vowels and identical intonation. Higher accuracy up to 95% can be reached by record all the subject’s voice.
Volume: 17
Issue: 2
Page: 965-972
Publish at: 2019-04-01
1 2 3
...
2091 2092
Show 1416 of 2092

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