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28,451 Article Results

Techno-Economic Analysis of Stand-Alone Hybrid Energy System for the Electrification of Iran Drilling Oil Rigs

10.12928/telkomnika.v15i2.6111
Abdullah; Universiti Teknologi Malaysia (UTM) Asuhaimi Mohd Zin , Mehdi; Universiti Teknologi Malaysia (UTM) Moradi , Jalal; Universiti Teknologi Malaysia Tavalaei , Amirreza; Universiti Teknologi Malaysia (UTM) Naderipour , Amir; Universiti Teknologi Malaysia (UTM) Hesam Khavari , Mohammad; Universiti Teknologi Malaysia (UTM) Moradi
This paper explores the potential of use of stand-alone hybrid wind/solar energy system in electrification of calibrating equipment of drilling oil rig in Iran. To achieve this, different hybrid energy system configurations based on calibration equipment demand are proposed. This study puts emphasis on the energy production and cost of energy from both wind turbine and photovoltaic (PV) in the hybrid system. In addition, to make conditions more realistic, the real meteorological data is used for HOMER software to perform the technical and economic analysis of the hybrid system. Results indicate that the PV array shares more electricity production than the wind turbine generator if both wind turbine and PV array are utilized in the wind/solar hybrid system. Moreover, results show that the operational cost will be reduced by the suggested hybrid system.
Volume: 15
Issue: 2
Page: 746-755
Publish at: 2017-03-01

Measurement of Dielectric Properties of Low-Density Polyethylene Nanocomposites Using “Sub-Hertz” Dielectric Spectroscopy

10.12928/telkomnika.v15i2.6153
Mohammad; Universiti Teknologi Malaysia Syamim Mohammad Basri , Lailatul; Universiti Teknologi Malaysia Akmal Abdul Rauf , Mohd; Universiti Teknologi Malaysia Hafizi Ahmad , Noor; Universiti Teknologi Malaysia Azlinda Ahmad , Yanuar; Universiti Teknologi Malaysia Z. Arief , Zulkarnain; Universiti Teknologi Malaysia Ahmad Noorden
Recently, many studies have been conducted on the dielectric properties of Low-Density Polyethylene (LDPE) nanocomposites and produced different results. However, the composition of LDPE polymer and boron nitride (BN) as nanofiller has neither been well understood nor producing a convenient result. Similarly, the dielectric spectroscopy measured at “sub–hertz” frequency has been of little interest among researchers since it is often influenced by “conduction-like” effect. This research identified the dielectric properties of LDPE nanocomposites filled with hexagonal boron nitride (h-BN) nanofillers by using dielectric spectroscopy technique. The dielectric loss and relative permittivity for three different filler concentrations were investigated under “sub-hertz” frequency ranges at room temperature. The cylindrical electrode with guard ring configuration was used to conduct the experiment, in accordance to the ASTM D150 standard. The results revealed that 5 wt% filled polymer has lower loss tangent and permittivity compared to the unfilled polymer, due to the strong interaction between nano-particle and the polymer. This strong interaction is believed to limit the movement of the polymer chain. The decrease in loss tangent also indicates lower quasi-DC at low frequency. However, further increase in the filler loading has recorded an increment in the value of permittivity and loss tangent. This higher effective permittivity is mainly due to the influence of the filler permittivity.
Volume: 15
Issue: 2
Page: 971-976
Publish at: 2017-03-01

Novel Artificial Magnetic Conductor for 5G Application

10.11591/ijeecs.v5.i3.pp636-642
Maizatun Muhamad , Maisarah Abu , Zahriladha Zakaria , Hasnizom Hassan
A design of novel bendable Artificial Magnetic Conductor (AMC) structures has been presented in this paper in two selected of frequencies at 5G application. These designs started with a square patch shape and continued with the combination of circular and Jerusalem shape which resonate at a frequency of 18 GHz and 28 GHz. Details of the theory and the structures of AMCs are explained. The reflection phase, bandwidth, angular stability and dispersion diagram were studied. The simulated results plotted that the novel AMC has good bandwidth and size is reduced by 53 percent and 55 percent for both frequencies. Other than that, it is also proved that the novel AMC has a stable reflection phase and no band gap performs at the specific frequency. The good performances of this novel AMC make it useful in order to improve antenna’s performance.
Volume: 5
Issue: 3
Page: 636-642
Publish at: 2017-03-01

Reduced Software Complexity for E-Government Applications with ZEF Framework

10.12928/telkomnika.v15i1.3195
Ahmad Nurul; Bina Nusantara University Fajar , Imam; UIN Syarif Hidayatullah Jakarta Marzuki Shofi
The situation of dynamic change is unpredictable and always growth increasingly. It also can happen anytime and anywhere. The one kind which is always changing is the government policy.This condition is suggested take the impact for software for information system. It will cause replacement, modification, and enhancement of software for information system. There is some commonality and variability of software features in Indonesian Government. Hence, to manage it, we present enhancement of Zuma’s E-Government Framework (ZEF) for reduce software complexity.We enhance ZEF Framework using  SPLE and GORE approach in order to improve traditional software development.It can reduce, if the changing continuously happen.The measurement of  software complexity relate to functionality of system.It can describe with function point, because function point can describe logical software complexity also. The preliminary result of this study can reduce efficiency of software complexity such as information processing size, technical complexity adjustment factors and function points in e-government applications.
Volume: 15
Issue: 1
Page: 415-420
Publish at: 2017-03-01

Model and Analysis of Multi Level Multi Frequency RF Rectifier Energy System for Low Power Supply Application Device

10.12928/telkomnika.v15i1.4051
Budi; Indonesian Computer University (UNIKOM) Herdiana , Bobi; Indonesian Computer University (UNIKOM) Kurniawan
Sustainable energy for the mobile electronic devices always needed during the energy storage batteries capacity in the mobile electronic devices are limited for a few hours for the usage time. To get a long lasting operating time from the mobile electronics equipment sets, the energy source should always be connected into the device. In this paper, we were proposed a charging energy method via wireless operation supply using the microwaves (RF) radiated by the air multi-frequency. The RF to DC rectifier circuit is a major component for changing the RF wave to an electronic current (DC). The Dickson models were used as an approach to superiority includes a simple series, low DC ripple factor, etc. The design, analysis, and the experimentation from the rectifier circuit have been conducted and presented in this paper. In the measurement, the mobile electronic devices placed at a distance about 5 meters from the energy source with the system voltage DC 3.7V, and have been obtained at the working frequency between 825 - 960MHz with the PCE values 12-33%, and a ripple factor of ± 0,01%. The charging time energy is needed about 4 hours at the research trial room, and about 11 hours outdoor had been observed. Based on these results, the wirelessly energy charging method for the mobile electronic devices is a potential methods to resolve the sustainable energy issue and the green technology supporting with the most programs. 
Volume: 15
Issue: 1
Page: 238-244
Publish at: 2017-03-01

Entity Annotation WordPress Plugin using TAGME Technology

10.12928/telkomnika.v15i1.4631
William; Universitas Multimedia Nusantara Aprilius , Seng; Universitas Multimedia Nusantara Hansun , Dennis; Universitas Multimedia Nusantara Gunawan
The development of internet technology makes more information can be accessed. It makes information need to be organized in order to be easily managed. One solution can be used is by using the entity annotation approach which generates tags to represent that document. In this study, TAGME technology is implemented on a WordPress plugin, which is used to manage a blog. Moreover, information on Wikipedia ‘Bahasa Indonesia’ is processed to generate an anchor dictionary which is required by the technology that is implemented. This plugin performs entity annotation by giving tag suggestion for posts in a blog. Testing is carried out by measuring the precision, recall, and  of tag suggestions given by the plugin. The result shows that the plugin can give tag suggestions with precision 0.7638, recall 0.5508, and  0.59.
Volume: 15
Issue: 1
Page: 486-493
Publish at: 2017-03-01

Prediction of Bioprocess Production Using Deep Neural Network Method

10.12928/telkomnika.v15i2.6124
Amirah; Universiti Teknologi Malaysia Baharin , Afnizanfaizal; Universiti Teknologi Malaysia Abdullah , Siti; Universiti Teknologi Malaysia Noorain Mohmad Yousoff
Deep learning enhanced the state-of-the-art methods in genomics allows it to be used in analysing the biological data with high prediction. The training process of neural network with several hidden layers which has been facilitated by deep learning has been subjected into increased interest in achieving remarkable results in various fields. Thus, the extraction of bioprocess production can be implemented by pathway prediction in genomic metabolic network in eschericia coli. As metabolic engineering involves the manipulation of genes which have the potential to increase the yield of metabolite production. A mathematical model of this network is the foundation for the development of computational procedure that directs genetic manipulations that would eventually lead to optimized bioprocess production. Due to the ability of deep learning to be well suited in terms of genomics, modelling for biological network can be implemented. Each layer reveal the insight of biological network which enable pathway analysis to be implemented in order to extract the target bioprocess production. In this study, deep neural network has been to identify any set of gene deletion models that offers optimal results in xylitol production and its growth yield. 
Volume: 15
Issue: 2
Page: 805-813
Publish at: 2017-03-01

Mathematical Modeling and Fuzzy Adaptive PID Control of Erection Mechanism

10.12928/telkomnika.v15i1.3568
Feng; Xi’an High-tech Research Institute Jiangtao , Gao; Xi’an High-tech Research Institute Qinhe , Guan; Xi’an High-tech Research Institute Wenliang
This paper describes an application of fuzzy adaptive PID controller to erection mechanism. Mathematical model of erection mechanism was derived. Erection mechanism is driven by electro-hydraulic actuator system which is difficult to control due to its nonlinearity and complexity. Therefore fuzzy adaptive PID controller was applied to control the system. Simulation was performed in Simulink software and experiment was accomplished on laboratory equipment. Simulation and experiment results of erection angle controlled by fuzzy logic, PID and fuzzy adaptive PID controllers were respectively obtained. The results show that fuzzy adaptive PID controller can effectively achieve the best performance for erection mechanism in comparison with fuzzy logic and PID controllers.
Volume: 15
Issue: 1
Page: 254-263
Publish at: 2017-03-01

Multi-feature Fusion Using SIFT and LEBP for Finger Vein Recognition

10.12928/telkomnika.v15i1.4443
Hardika; Institut Teknologi Sepuluh Nopember Khusnuliawati , Chastine; Institut Teknologi Sepuluh Nopember Fatichah , Rully; Institut Teknologi Sepuluh Nopember Soelaiman
In this paper, multi-feature fusion using Scale Invariant Feature Transform (SIFT) and Local Extensive Binary Pattern (LEBP) was proposed to obtain a feature that could resist degradation problems such as scaling, rotation, translation and varying illumination conditions. SIFT feature had a capability to withstand degradation due to changes in the condition of the image scale, rotation and translation. Meanwhile, LEBP feature had resistance to gray level variations with richer and discriminatory local characteristics information. Therefore the fusion technique is used to collect important information from SIFT and LEBP feature.The resulting feature of multi-feature fusion using SIFT and LEBP feature would be processed by Learning Vector Quantization (LVQ) method to determine whether the testing image could be recognized or not. The accuracy value could achieve 97.50%, TPR at 0.9400 and FPR at 0.0128 in optimum condition.  That was a better result than only use SIFT or LEBP feature.
Volume: 15
Issue: 1
Page: 478-485
Publish at: 2017-03-01

Layout Optimization of Microsatellite Components Using Genetic Algorithm

10.12928/telkomnika.v15i1.3872
Mohammad; LAPAN Mukhayadi , Irman; Bogor Agricultural University (IPB) Hermadi , Soewarto; Pakuan University, Bogor. Hardhienata
The placement of satellite components usually belongs to non-deterministic polynomial-time hard (NP-hard) problems that in terms of computational complexity is very difficult to solve. This problem is normally known as layout optimization problem (LOP). In this study the layout of microsatellite components has to meet the requirements set by mission payloads, launcher and spacecraft attitude control. The novel scheme is to find the various possibilities of optimal layout using genetic algorithms combined with order-based positioning technique (OPT). Each component has a given index and then placed in a container based on specific order of placements in accordance with a bottom-left (BL) algorithm that is already established. The placement order is generated by the genetic algorithm which explore various possibilities to obtain a sequence that brings the best solution.
Volume: 15
Issue: 1
Page: 341-350
Publish at: 2017-03-01

A Mamdani Fuzzy Model to Choose Eligible Student Entry

10.12928/telkomnika.v15i1.4893
Agus; University of Computer Indonesian (UNIKOM) Nursikuwagus , Agis; Bandung Institute of Technology Baswara
This paper presented about study that have been created a new student choosing system by using fuzzy mamdani inference systems method. Fuzzy mamdani is used because it has characteristics such as human perceptions on choosing of students with some specified criteria. The choosing studens who want entry to the school have been difficult if it is manually process. With the fuzzy mamdani, the process can be possible completed execute and can be reduced the time of choose. To accomplish the process, the fuzzy variable is created by the national final exam scores, report grade, general competency test, physical test, interview and psychological test. Based on testing 270 data, the fuzzy mamdani has been reached 75.63% accuracy.
Volume: 15
Issue: 1
Page: 365-372
Publish at: 2017-03-01

Topology Design of Extended Torus and Ring for Low Latency Network-on-Chip Architecture

10.12928/telkomnika.v15i2.6134
Ng; University Malaysia Perlis Yen Phing , M. N.; University Malaysia Perlis Mohd Warip , Phaklen; University Malaysia Perlis Ehkan , F. W.; University Malaysia Perlis Zulkefli , R.; University Malaysia Perlis Badlishah Ahmad
In essence, Network-on-Chip (NoC) also known as on-chip interconnection network has been proposed as a design solution to System-on-Chip (SoC). The routing algorithm, topology and switching technique are significant because of the most influential effect on the overall performance of Network-on-Chip (NoC). Designing of large scale topology alongside the support of deadlock free, low latency, high throughput and low power consumption is notably challenging in particular with expanding network size. This paper proposed an 8x8 XX-Torus and 64 nodes XX-Ring topology schemes for Network-on-Chip to minimize the latency by decrease the node diameter from the source node to destination node. Correspondingly, we compare in differences on the performance of mesh, full-mesh, torus and ring topologies with XX-Torus and XX-Ring topologies in term of latency. Results show that XX-Ring outperforms the conventional topologies in term of latency. XX-Ring decreases the average latency by 106.28%, 14.80%, 6.7 1%, 1.73%, 442.24% over the mesh, fully-mesh, torus, XX-torus, and Ring topologies.
Volume: 15
Issue: 2
Page: 869-876
Publish at: 2017-03-01

An Adaptive Controller for Photovoltaic Emulator using Artificial Neural Network

10.11591/ijeecs.v5.i3.pp556-563
Razman Ayop , Chee Wei Tan
The photovoltaic (PV) emulator is a nonlinear power supply that features the similar characteristic of the PV module. However, the nonlinear characteristic of the PV module causes instability of the PV emulator output. The conventional solution is to operate the PV emulator in the overdamped condition which results in a poor dynamic performance. This drawback is solved by manipulating the proportional and integral gains of the proportional-integral (PI) controller. In this paper, the artificial neural network is used in the adaptive PI controller to maintain a stable and fast dynamic response of the PV emulator. This has been simulated with varied output resistance and irradiance. By comparing the proposed control strategy with the conventional method during start-up response of the photovoltaic emulator, the dynamic performance of the output current has shown an improvement of up to 80 % faster than the conventional method.
Volume: 5
Issue: 3
Page: 556-563
Publish at: 2017-03-01

Prevention of Nosocomial Infection through Application of Housekeeping

10.11591/ijphs.v6i1.6538
Qomariyatus Sholihah , Aprizal Satria Hanafi
The hospital has a high risk of nosocomial infection. Nosocomial infection can infect patients in hospital and can inhibit the patient's recovery, even worsen a patient. The purpose of this study was to determine the relationship of the application of housekeeping with the total number of germs floor as prevention nosocomial infection in the treatment room Roses in Ulin Hospital Banjarmasin, Indonesia. The study design was observational analytic. The study population was all Roses class treatment rooms. The samples were taken from the floor germs 4 point class treatment rooms in hospitals Rose Ulin. Sampling was conducted in the first week and the second week in November 2015. Paired t-test results showed no relationship between the applications of housekeeping with the total number of germs floor with a p-value 0.015.This study found there was decreasing the total number of germ on the floor in all rooms. It is hoped that the hospital to continue to pay attention to the condition of the hospital, especially in terms of hygiene in order to avoid transmission of germs or nosocomial infections due to bacteria originating from the floor.
Volume: 6
Issue: 1
Page: 91-95
Publish at: 2017-03-01

Ethnicity, Obesity, and Type 2 Diabetes of Adults in Urban Populations of Central America

10.11591/ijphs.v6i1.6529
William G Wuenstel , James A. Johnson , James Humphries , Cheryl Samuel
The purpose of this meta-analysis was to examine the impact of ethnicity and obesity as it relates to Type-2 Diabetes (T2D) in specific Central American countries. A meta-analysis was conducted to determine the association of ethnicity, obesity, and T2D.  Four studies that qualified for inclusion were identified by searching MEDLINE and PubMed databases. The studies on the association of ethnicity and T2D had a combined population resulted in 265,858 study participants.  Two studies on the association of obesity and T2D had 197,899 participants. An analysis of the data was conducted utilizing the relative risk ration, odds ratio, and forest plots. The comparison of the relative risk of T2D across ethnic categories by studies range for Blacks was 1.59 to 2.74, Asians was 1.43 to 2.08, and Hispanics .92 to 2.91. The ethnic difference in the prevalence of diabetes was almost two-fold higher in all ethnic groups than among the Caucasians with a significance level of 95%. A comparison of relative risk of T2D across weight categories was significantly higher among those with a diagnosed of diabetes in all reported areas. The odds ratio was very close to the risk ratio in both ethnicity and obesity to the development of T2D.The meta-analysis findings documented that an association does exist between ethnicity and obesity to the development of type 2 diabetes.
Volume: 6
Issue: 1
Page: 27-32
Publish at: 2017-03-01
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