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30,033 Article Results

Performance of MPLS-based Virtual Private Networks and Classic Virtual Private Networks Using Advanced Metrics

10.12928/telkomnika.v16i5.7326
Kennedy; Covenant University Okokpujie , Olamilekan; Covenant University Shobayo , Etinosa; Covenant University Noma-Osaghae , Okokpujie; Covenant University Imhade , Obinna; Covenant University Okoyeigbo
Multiprotocol Label Switching (MPLS) is effective in managing and utilizing available network bandwidth. It has advanced security features and a lower time delay. The existing literature has covered the performance of MPLS-based networks in relation to conventional Internet Protocol (IP) networks. But, too few literatures exist on the performance of MPLS-based Virtual Private Networks (VPN) in relation to traditional VPN networks. In this paper, a comparison is made between the effectiveness of the MPLS-VPN network and a classic VPN network using simulation studies done on OPNET®. The performance metrics used to carry out the comparison include; End to End Delay, Voice Packet Sent/Received and Label Switched Path’s Traffic. The simulation study was carried out with Voice over Internet Protocol (VoIP) as the test bed. The result of the study showed that MPLS-based VPN networks outperform classic VPN networks.
Volume: 16
Issue: 5
Page: 2073-2081
Publish at: 2018-10-01

Critical Review of Different Methods for Siting and Sizing Distributed-generators

10.12928/telkomnika.v16i5.9693
Shomefun T; Covenant University S , Ademola; Covenant University A , Awosope CO; Covenant University A , Adekitan A; Covenant University I
Due to several benefits attached to distributed generators such as reduction in line losses, improved voltage profile, reliable system etc., the study on how to optimally site and size distributed generators has been on the increase for more than two decades. This has propelled several researchers to explore various scientific and engineering powerful simulation tools, valid and reliable scientific methods like analytical, meta-heuristic and hybrid methods to optimally place and size distributed generator(s) for optimal benefits. This study gives a critical review of different methods used in siting and sizing distributed generators alongside their results, test systems and gaps in literature.
Volume: 16
Issue: 5
Page: 2395-2405
Publish at: 2018-10-01

Balancing Compression and Encryption of Satellite Imagery

10.11591/ijece.v8i5.pp3568-3586
Ali J. Abboud , Ali N. Albu-Rghaif , Abbood Kirebut Jassim
With the rapid developments in the remote sensing technologies and services, there is a necessity for combined compression and encryption of satellite imagery. The onboard satellite compression is used to minimize storage and communication bandwidth requirements of high data rate satellite applications. While encryption is employed to secure these resources and prevent illegal use of image sensitive information. In this paper, we propose an approach to address these challenges which raised in the highly dynamic satellite based networked environment. This approach combined compression algorithms (Huffman and SPIHT) and encryptions algorithms (RC4, blowfish and AES) into three complementary modes: (1) secure lossless compression, (2) secure lossy compression and (3) secure hybrid compression. The extensive experiments on the 126 satellite images dataset showed that our approach outperforms traditional and state of art approaches by saving approximately (53%) of computational resources. In addition, the interesting feature of this approach is these three options that mimic reality by imposing every time a different approach to deal with the problem of limited computing and communication resources.
Volume: 8
Issue: 5
Page: 3568-3586
Publish at: 2018-10-01

About Quality of Optical Channels in Wavelength Division Multiplexing Systems of Optic Fibers

10.12928/telkomnika.v16i5.10300
Mirazimova Gulnora; Tashkent University of Information Technologies Hasanovna
Researches and the analysis of factors of the systems influencing quality with division according to radiation wavelength are given in article. Especially the communication quality in systems with wave division of channels is influenced by hindrances from Four Wave Mixing. In this regard the technique of definition of number of products of nonlinear effect of Four Wave Mixing getting to ranges of working channels, results of calculation of combinational products for the different number of channels in systems with division according to radiation wavelength is given. Power of a hindrance of Four Wave Mixing in systems with wave division of channels is calculated. Methods of reduction of influences of these nonlinear effects are considered. Conclusions and recommendations on ensuring quality of optical channels are provided in systems with wave division.
Volume: 16
Issue: 5
Page: 2005-2013
Publish at: 2018-10-01

A Hardware Model to Measure Motion Estimation with Bit Plane Matching Algorithm

10.12928/telkomnika.v16i5.7672
Shaik Asif; Middle East College Hussain , Chandrashekar; Middle East College Ramaiah , S. Javeed; Sultanate of Oman Hussain
The multistep approach involving combination of techniques is referred as motion estimation. The proposed approach is an adaptive control system to measure the motion from starting point to limit of search. The motion patterns are used to analyze and avoid stationary regions of image. The algorithm proposed is robust efficient and the calculations justify its advantages. The motivation of the work is to maximize the encoding speed and visual quality with the help of motion vector algorithm. In this work a hardware model is developed in which a frame of pictures are captured and sent via serial port to the system. MATLAB simulation tool is used to detect the motion among the picture frame. Once any motion is detected that signal is sent to the hardware which will give the appropriate sign accordingly. This system is developed on two platforms (hardware as well software) to estimate and measure the motion vectors.
Volume: 16
Issue: 5
Page: 2091-2100
Publish at: 2018-10-01

Enhanced RSA Cryptosystem based on Multiplicity of Public and Private Keys

10.11591/ijece.v8i5.pp3949-3953
Ahmed Eskander Mezher
Security is one of the most important concern to the information and data sharing for companies, banks, organizations and government facilities. RSA is a public cryptographic algorithm that is designed specifically for authentication and data encryption. One of the most powerful reasons makes RSA more secure is that the avoidance of key exchange in the encryption and decryption processes. Standard RSA algorithm depends on the key length only to protect systems. However, RSA key is broken from time to another due to the development of computers hardware such as high speed processors and advanced technology. RSA developers have increased a key length or size of a key periodically to maintain a high security and privacy to systems that are protected by the RSA. In this paper, a method has been designed and implemented to strengthen the RSA algorithm by using multiple public and private keys. Therefore, in this method the security of RSA not only depends on the key size, but also relies on the multiplicity of public and private keys.
Volume: 8
Issue: 5
Page: 3949-3953
Publish at: 2018-10-01

A Comparative Modeling and Analysis of Voltage Variation by Using Spectrogram

10.12928/telkomnika.v16i5.9493
Weihown; Universiti Teknikal Malaysia Melaka (UTeM) Tee , AR; Universiti Teknikal Malaysia Melaka (UTeM) Abdullah , T; Universitas Ahmad Dahlan (UAD) Sutikno , MH; CeRIA, UTeM Jopri , M; CeRIA, UTeM Manap
In this paper, the power quality (PQ) disturbance which is the voltage variations consist of voltage swell, sag and interruption are model and analyze. Different types of voltage variations PQ disturbances models are developed and created by using MATLAB/Simulink as well as mathematical models. The mathematical and Simulink model are used to compare in terms of time-frequency representation (TFR). The Simulink models include shutting down enormouscapacities from system to resemble voltage swell, large loads energizing and three-phase fault to simulate voltage sag as well as implementing permanent three-phase fault to simulate voltage interruption. The signals generated are analyzed by using linear time-frequency distribution (TFD). The signal parameters such as root mean square voltage (Vrms), total harmonic distortion (THD) and power value are estimated from the TFR to identify the characteristics of the voltage variation. The results of analysis on the PQ disturbance waveforms generated are identical to the actual real-time PQ signals and the models can be modified to any desired situation respectively. The PQ waveforms obtained are suitable to be further analyzed.
Volume: 16
Issue: 5
Page: 2385-2394
Publish at: 2018-10-01

Establishment of Standard Reference Environment for Photovoltaic Nominal Operating Cell Temperature Testing with Dedicated Approach for Tropical Region

10.11591/ijeecs.v12.i1.pp433-440
M.M.M. Hanifah , H. Zainuddin , M.Z. Hussin
This paper presents the establishment of Standard Reference Environment (SRE) for photovoltaic (PV) Nominal Operating Cell Temperature (NOCT) testing in Malaysia representing one of the countries that lies in tropical region. From a field testing conducted, 12-months data of six parameters namely solar irradiance (SI), ambient temperature (AT), relative humidity (RH), wind speed (WS), wind direction (WD), module temperature (MT) and open circuit voltage were analysed to determine the median SI and the median AT.  From the analysis, the median SI and the median AT are 228 W/m2 and 30 °C respectively.  However, these results show that the current approach in determining SRE using median ambient parameters is not suitable for tropical Malaysia based on the percentage error of approximately   30 %. Due to this, the proposed approach applied in this study is determining the corresponding AT of the same SI (800 W/m2) used in present SRE of international standard. Thus, the new proposed SI and AT for SRE in this study are 800W/m2 and 31°C respectively. The SRE found in this study is determined using dedicated approach to suit tropical climate in deriving a more accurate NOCT for tropical region.
Volume: 12
Issue: 1
Page: 433-440
Publish at: 2018-10-01

Techno-economic Viability and Energy Conversion Analysis of RHES with Less Weight/Area

10.12928/telkomnika.v16i5.8897
Mohammed Kdair; University of Technology Abd , Hadeel Nasrat; University of Technology Abdullah , Haishun; Huazhong University of Science & Technology Sun , Shijie; Huazhong University of Science & Technology Cheng
This article proposes a new strategy to find the optimal location, configuration and size of the Renewable (wind-photovoltaic-diesel-battery) Hybrid Energy Systems (RHES (off-grid)). This study has two steps: first, the proposaltoa strategybased on a weather change to find the optimal location in Iraq using Hybrid Optimization Model for Electric-Renewables (HOMER) software. Second, the study will examine the influence of the techno-economic viability from side less weight and area on the optimal configuration/size of the RHES, which gives the maximum output power. A period of one-year for meteorological data for both solar radiation and wind speed has used. Finally, simulation results indicated that the optimal location for this RHES is the AL Harithah location. The analysis has shown that RHES can supply 89% of the load demands by renewable-energy. It is also successful in reducing the area required for installation of the RHES about 28%.
Volume: 16
Issue: 5
Page: 2331-2341
Publish at: 2018-10-01

Implementation of E-Voting System for Student Union Government Elections

10.12928/telkomnika.v16i5.9739
Aderibigbe I.; Covenant University Adekitan , Victor O.; Covenant University Matthews , Temitope M.; Covenant University John , Stanley; Covenant Univeristy Uzairue
Several records of violence during student body elections in higher institutions of learning can be found dating back to the 1988 Abu crisis. The causal factors are multifaceted, involving both internal factors within the institution and external factors, and interest parties like main stream politicians. Suspicion of the possibility of rigging during a planned election can trigger pre-election violence, while alleged rigging during the election or the vote counting process is the major cause of election unrest during student government elections. The voting process is typically manual, and it is done through the use of ballot boxes and papers. This is error prone, inefficient and susceptible to rigging. Preventing mistrust-induced election violence requires the deployment of a trustworthy alternative to the paper ballot system. In this study, an electronic voting system is developed using Visual Basic and Microsoft Access Database. The application performs voter authentication by verifying a pre-issued pin which is unique for each voter. The system is accurate and engages the participation and login of agents who are representatives of the candidates’ contesting for various offices thereby building trust in the process.
Volume: 16
Issue: 5
Page: 2155-2164
Publish at: 2018-10-01

Impact of Combine Dithering and Modulators to Mitigate Noise in Radio Over Fiber System

10.11591/ijeecs.v12.i1.pp428-432
Fakhriy Hario , Eka Maulana , Hadi Suyono , Rini N Hasanah , Sholeh H Pramono
A well-prepared Radio over Fiber (RoF) is a technology that combines two transmission technologies, radio and optical fiber transmissions. The study focused on the characteristics and problems of the optical fiber medium. One of the problems in the optical fiber is the effect of nonlinear characteristic, which caused by the high light intensity in the optical fiber core with extended interaction area in a single mode fiber (SMF). This characteristic reduces the output width and creates a pulse broadening. The nonlinear characteristics discussed in this study focused on SPM (self-phase modulation) and GVD (Group Velocity Dispersion). To overcome the nonlinear problems, this study presented a method to make the noise-resistant transmitted signal and improve the optical fiber power range. The fundamental of this study was developing similarities of previous studies regarding nonlinearity in the optical fiber. The results show that the use of two modulators combined with the amplification generated the signal with smoother spectrum, which means that the spectrum distribution was more uniform. There was 61.5 % increase of the peak power of the output signal after amplification using an optical amplifier.
Volume: 12
Issue: 1
Page: 428-432
Publish at: 2018-10-01

Effort Estimation Development Model for Web-Based Mobile Application Using Fuzzy Logic

10.12928/telkomnika.v16i5.6561
Stefani; Bina Nusantara University Agusta , Suharjito; Bina Nusantara University Suharjito , Abba Suganda; Bina Nusantara University Girsang
Effort estimation becomes a crucial part in software development process because false effort estimation result can lead to delayed project and affect the successful of a project. This research proposes a model of effort estimation for web-based mobile application developed using object oriented approach. In the proposed model, functional size measurement of object oriented based web application named OOmFPWeb, web metric and mobile characteristic for web-based mobile application size measurement are combnined. The estimation process is done by using mamdani fuzzy logic method. To evaluate the proposed model, the comparison between OOmFPWeb as the variable that affect effort estimation for web-based mobile application and the proposed model are performed. The evaluation result shows that effort estimation for web-based mobile application with the proposed model is better than just using OOmFPWeb.
Volume: 16
Issue: 5
Page: 2082-2090
Publish at: 2018-10-01

E-dopt: A Mobile Application for Pet Adoption in Indonesia

10.12928/telkomnika.v16i5.8074
Santy; Bina Nusantara University Santy , Ryan; Bina Nusantara University Karuna , Alvin; Bina Nusantara University Budiman
In this research, we discuss the current trend on pet adoption in Indonesia and introduce a mobile application called e-dopt to encourage more pet adoption in Indonesia. Pet adoption mobile application is not yet popular in Indonesia, thus the benefit of conducting this research. Within this research, a mobile application to help the pet adoption process has been developed. The mobile application is developed on Android platform and the requirements are gathered by interviews, surveys, and research that have been conducted. The mobile application developed provides convenience for those who wants to adopt or give out pets and also allows businesses in pet product industry to use the mobile application as a sales channel.
Volume: 16
Issue: 5
Page: 2137-2143
Publish at: 2018-10-01

Temperature Monitoring and Forecast System in Remote Areas with 4.0G LTE Mobile Technologies

10.12928/telkomnika.v16i5.10246
Kevin Alexandre; Universidad Nacional de Colombia Riaño Vargas , Octavio José; Universiad Nacional de Colombia Salcedo Parra , Miguel J.; Universidad Distrital “Francisco José de Cáldas” Espitia R.
The need to monitor areas of high risk in terms of temperature indexes has included two important elements for its compliance: monitoring and forecast of records in an environment. Performing this procedure manually is inefficient as it provides a flat perspective and can’t predict the state of the environment with rigor. Software systems are contemporary elements in constant refinement, which satisfy emerging needs of a context, so that, in relation to monitoring and forecast an environment, it allows a sophisticated automation of the process, and that tends to lead to a better supervision of the risks in the environment. This article presents a proposal for the supervision of high-risk areas, through temperature registers, manageable through the design of a software system with the implementation of mobile 4.0G LTE technologies, aimed at efficiency and effectiveness in the notification of environmental status. Finally, I conclude with a remote temperature monitoring and forecast system, using mobile technologies, with a fuzzy logic prediction system with a quadratic error not greater than 2.6%, that is, on a fuzzy algebra system whose Numerical calculation does not exceed this error value in comparison with actual values; At the same time that the future works are presented from the approach of the research that is postulated, according to the emergence of new perspectives related to this developing software system.
Volume: 16
Issue: 5
Page: 1988-2004
Publish at: 2018-10-01

Vibration-Based Damaged Road Classification Using Artificial Neural Network

10.12928/telkomnika.v16i5.7574
Yudy; Bina Nusantara University Purnama , Fergyanto E.; Bina Nusantara University Gunawan
It is necessary to develop an automated method to detect damaged road because manually monitoring the road condition is not practical. Many previous studies had demonstrated that the vibration-based technique has potential to detect damages on roads. This research explores the potential use of Artificial Neural Network (ANN) for detecting road anomalies based on vehicle accelerometer data. The vehicle is equipped with a smart-phone that has a 3D accelerometer and geo-location sensors. Then, the vehicle is used to scan road network having several road anomalies, such as, potholes, speedbump, and expansion joints. An ANN model consisting of three layers is developed to classify the road anomalies. The first layer is the input layer containing six neurons. The numbers of neurons in the hidden layer is varied between one and ten neurons, and its optimal number is sought numerically. The prediction accuracy of 84.9% is obtained by using three neurons in conjunction with the maximum acceleration data in x, y, and z-axis. The accuracy increases slightly to 86.5%, 85.2%, and 85.9% when the dominant frequencies in x, y, and z-axis, respectively, are taken into account beside the previous data.
Volume: 16
Issue: 5
Page: 2179-2190
Publish at: 2018-10-01
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