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

29,734 Article Results

An electrical power control system for explorer-class remotely operated underwater vehicle (ROV)

10.12928/telkomnika.v17i2.11757
Muhammad Ikhsan; Telkom University Sani , Simon; Telkom University Siregar , Muhammad Muchlis; Telkom University Kurnia , Dzikri; Telkom University Hasbialloh
The importance of an optimal method for electric power transmission is crucial for ROV operation. Meanwhile, only few studies have shown the effect of electrical power system from power supply to ROV.This paper proposes a design and implementation of electrical power system for ROV that developed by Tech_SAS team from Telkom University, Bandung, Indonesia. This work aims to obtain the optimal power system to supply ROV’s electrical and electronic components. Tech_SAS ROV is developed to compete on 1st and 2nd ASEAN MATE Underwater Robotic Competition. The system has demonstrated that 48V electric voltage can be transmitted to ROV with negligible voltage drop when using 20 meter 12AWG cable. The voltage is converted to 12V using DC-DC converter in order to supply various ROV’s electronic devices ROV safely and efficiently. Meanwhile, the microcontroller was used to as thrust control to manage current flow to DC motor. The system has been evaluated and demonstrates optimal results and provides a design consideration about ROV’s power system especially on tether cable and power distribution scheme.
Volume: 17
Issue: 2
Page: 928-936
Publish at: 2019-04-01

Dashboard settings design in SVARA using user-centred design method

10.12928/telkomnika.v17i2.8762
Muhammad Yusril; Politeknik Pos Indonesia Helmi Setyawan , Rolly Maulana; Politeknik Pos Indonesia Awangga , Rezka; Politeknik Pos Indonesia Afriyanti
SVARA is the first Social Media audio application in Indonesia developed by PT. Zamrud Teknologi Khatulistiwa. At present, this application does not have feature settings to display content and other basic settings on the user's side. This situation results in users not having the role to manage the appearance of the dashboard according to their preferences. Settings are done entirely by administrators using scripts and must take APIs with regular PHP scripts. And this is very troublesome. So to give a role to the view of user management, the application needs to be made a dashboard setting feature as a follow-up. Through this paper, the researchers propose designing this dashboard feature using the User-Centered Design (UCD) method. The design results show that this method has a positive correlation with user involvement support in the application development process.
Volume: 17
Issue: 2
Page: 615-619
Publish at: 2019-04-01

A low-cost fiber based displacement sensor for industrial applications

10.12928/telkomnika.v17i2.9754
Siti Mahfuza; Universiti Teknologi Malaysia Saimon , Nor Hafizah; Universiti Tun Hussein Onn Malaysia Ngajikin , Muhammad Shafiq; Universiti Teknologi Malaysia Omar , Mohd Haniff; Universiti Teknologi Malaysia Ibrahim , Muhammad Yusof; Universiti Teknologi Malaysia Mohd Noor , Ahmad Sharmi; Universiti Teknologi Malaysia Abdullah , Mohd Rashidi; Universiti Teknologi Malaysia Salim
In this paper, a low-cost fiber optic displacement sensor (FODS) using a bundle of plastic optical fiber (POF) as a probe is developed and presented. The sensor consists of a high power light emitting diode (LED) as light source, a probe with multiple receiving plastic optical fiber and a photodiode detector. The sensor is characterized at millimeter distance and the sensor output is analyzed from 0 mm to 13 mm displacement. The sensitivity of the sensor is found to be 5.38 mV/mm over 2.6 mm sensing range. The sensor is very useful for close distance target since it is highly sensitive at the front slope. The low development cost, high degree of sensitivity and simplicity of the design make it suitable for wide range of industrial applications.
Volume: 17
Issue: 2
Page: 555-560
Publish at: 2019-04-01

Compared to wireless deployment in areas with different environmentse

10.11591/ijece.v9i2.pp934-940
Inaam Abbas Hieder
In the mobile phone system, it is highly desirable to estimate the loss of the track not only to improve performance but also to achieve an accurate estimate of financial feasibility; the inaccurate estimate of track loss either leads to performance degradation or increased cost. Various models have been introduced to accurately estimate the path loss. One of these models is the Okomura / Hata model, which is recommended for estimating path loss in cellular systems that use micro cells. This system is suitable for use in a variety of environments. This study examines the comparison of path loss models for statistical analysis derived from experimental data collected in urban and suburban areas at frequencies of 150-1500 MHz’s The results of the measurements were used to develop path loss models in urban and suburban areas. The results showed that Pathloss increases in urban areas respectively.
Volume: 9
Issue: 2
Page: 934-940
Publish at: 2019-04-01

UDP Protocol for multi-task assignment in "void loop" robot soccer

10.12928/telkomnika.v17i2.11782
Irma; Telkom University Damayanti , Simon; Telkom University Siregar , Muhammad Ikhsan; Telkom University Sani
The communication system is a very important part of the robot soccer. It is because the robots must be able to move together, alternate and individual. The communication system that would be discussed is about the process of sending data from one robot to another robot using coach computer. It started with the reception of data from coach computer to both robots that had been installed Wi-Fi Communication module that had been connected to the router. Then, the data is processed using Arduino Mega2560. After that, the robot would detect the existence of the ball. The protocol used for the communication system is a UDP protocol (User Datagram Protocol) because UDP has several characteristics that support the occurrence of communication robots such as connection-less and unreliable. Both of characteristics have a faster connection, they do not require handshaking and UDP protocol provides a mechanism for sending a message to a specific process. The result shows that the communication system between coach computer and both robots is successful. This is indicated by the start button and stop button is 100% with repeating data transfer system on UDP protocol.
Volume: 17
Issue: 2
Page: 986-994
Publish at: 2019-04-01

Improving spectrogram correlation filters with time-frequency reassignment for bio-acoustic signal classification

10.11591/ijeecs.v14.i1.pp59-64
Salina Abdul Samad , Aqilah Baseri Huddin
Spectrogram features have been used to automatically classify animals based on their vocalization. Usually, features are extracted and used as inputs to classifiers to distinguish between species. In this paper, a classifier based on Correlation Filters (CFs) is employed where the input features are the spectrogram image themselves.  Spectrogram parameters are carefully selected based on the target dataset in order to obtain clear distinguishing images termed as call-prints. An even better representation of the call-prints is obtained using spectrogram Time-Frequency (TF) reassignment. To demonstrate the application of the proposed technique, two species of frogs are classified based on their vocalization spectrograms where for each species a correlation filter template is constructed from multiple call-prints using the Maximum Margin Correlation Filter (MMCF). The improved accuracy rate obtained with TF reassignment demonstrates that this is a viable method for bio-acoustic signal classification.
Volume: 14
Issue: 1
Page: 59-64
Publish at: 2019-04-01

Facial image retrieval on semantic features using adaptive mean genetic algorithm

10.12928/telkomnika.v17i2.3774
Marwan Ali; Universiti Malaysia Pahang Shnan , Taha H.; Universiti Malaysia Pahang Rassem , Nor Saradatul Akmar; Universiti Malaysia Pahang Zulkifli
The emergence of larger databases has made image retrieval techniques an essential component and has led to the development of more efficient image retrieval systems. Retrieval can either be content or text-based. In this paper, the focus is on the content-based image retrieval from the FGNET database. Input query images are subjected to several processing techniques in the database before computing the squared Euclidean distance (SED) between them. The images with the shortest Euclidean distance are considered as a match and are retrieved. The processing techniques involve the application of the median modified Weiner filter (MMWF), extraction of the low-level features using histogram-oriented gradients (HOG), discrete wavelet transform (DWT), GIST, and Local tetra pattern (LTrP). Finally, the features are selected using Adaptive Mean Genetic Algorithm (AMGA). In this study, the average PSNR value obtained after applying the Wiener filter was 45.29. The performance of the AMGA was evaluated based on its precision, F-measure, and recall, and the obtained average values were respectively 0.75, 0.692, and 0.66. The performance matrix of the AMGA was compared to those of particle swarm optimization algorithm (PSO) and genetic algorithm (GA) and found to perform better; thus, proving its efficiency.
Volume: 17
Issue: 2
Page: 882-896
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

A microwave active filter for nanosatellite’s receiver front-ends at s-bands

10.11591/ijece.v9i2.pp973-981
Linh Ta Phuong , Bernard Journet , Duong Bach Gia
In satellite technology, the communication between space segment and ground segment plays a vital role in the success of the mission. This paper is targeted at study, design and fabrication of a microwave active filter for the receiver front-ends using coupled line filter structure, which can be applied to the nanosatellite’s communication subsystem. The whole active filter module is a combination of a microstrip bandpass filter and a preceding two-stage wideband low noise amplifier using FET devices. The proposed module operates in the frequency range of 2 - 2.4 GHz, which can be divided to 10 frequency slots of about 40 MHz for each. These frequency slots will be used for the S-band multi-frequency receiving function of the ground station, as well as the nanosatellite. The simulated and measured results of this active filter configuration are presented.
Volume: 9
Issue: 2
Page: 973-981
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
1 2 3
...
1982 1983
Show 1306 of 1983

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