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31,291 Article Results

Optimum Work Frequency for Marine Monitoring Based on Genetic Algorithm

10.12928/telkomnika.v16i4.7328
Fahraini; Mercu Buana University Bacharuddin , Hadi; Mercu Buana University Wuryanto , Yuliza; Mercu Buana University Yuliza , Beny; Mercu Buana University Nugraha
The communication using of HF (High Frequency) is a system that depends on wave propagation using sky waves reflected by the earth's ionosphere layer so that it is highly effective for long distance communication, but highly dependent on varying ionospheric conditions from day and night (time after time) as well as the location of the transmitter and receiver radio. Currently, there is only one main frequency channel and one reserve frequency channel so that there are frequency constraints unable to communicate due to ionosphere changes. This research will predicted allocation of HF frequency to support long distance communication for marine monitoring using Genetic Algorithm method. Output or prediction results in the form of Optimum Work Frequency (OWF) for 24 hours and frequency graph.
Volume: 16
Issue: 4
Page: 1551-1559
Publish at: 2018-08-01

Development of Pose Estimation Algorithm for Quranic Arabic Word

10.12928/telkomnika.v16i4.9048
Luqman Naim Mohd; International Islamic University Malaysia Esa , Malik Arman; International Islamic University Malaysia Morshidi , Syarah Munirah Mohd; International Islamic University Malaysia Zailani
The study carried out in this report proposes the best keypoint detection, description, and pose estimation algorithm combination for Quranic Arabic words. Oriented-FAST Rotated-BRIEF (ORB) and Accelerated-KAZE (AKAZE) are used as the keypoint detection and description algorithms while Random Sample Consensus (RANSAC) and Least Median Squares (LMEDS) are used to evaluate the homography for pose estimation algorithms. The algorithms are combined with each other to provide four different techniques to estimate the pose of Quranic Arabic words. The algorithms are tested on a limited dataset chosen from a phrase within the Quran. Performance of each algorithm is measured in real-time through inlier to keypoint ratio which determines pose accuracy.
Volume: 16
Issue: 4
Page: 1633-1641
Publish at: 2018-08-01

Wireless Sensor Network Design for Earthquake’s and Landslide’s Early Warnings

10.11591/ijeecs.v11.i2.pp437-445
Haziel Latupapua , Andrias Izaac Latupapua , Abdi Wahab , Mudrik Alaydrus
Indonesia including the earthquake-prone areas because Indonesia is situated between three tectonic plates and in the Maluku island it self has a fault line 10 zones, the impact of frequent tectonic earthquake on the island of Maluku resulted in a domino effect, such as the frequent occurrence of soil landslides at several points in the city of Ambon, and due to faults that occur lead ease rising sea levels to population centers so Ambon was becoming flooded. This research aims to design and analyzing measurements of earthquake monitoring system indication and landslides integrated via Wireless Sensor Network (WSN) by implementing a star topology, technology, ZigBee, WiFi technology Shield and GPRS (General Packet Radio Service). Researchers technology utilizes Wireless Sensor Network (WSN) to acquire and distribute widely the data to be monitored and controlled centrally.By detecting suspicious indicators such as tremor or landslides through nodes or end devices, the system provides information to the number of monitors and warnings. The system can also be accessed in real-time via the website by accessing the IP address of the Wireless-LAN devices Wi-Fi Arduino Shield.
Volume: 11
Issue: 2
Page: 437-445
Publish at: 2018-08-01

Evaluation of Water Content in Milk Using Microwave Transmission Approach with Horn Antenna

10.11591/ijict.v7i2.pp77-81
Ashok. Ja , Kiran Patil
As the diary industries delivery the milk to consumer bottles in pouches the thickness of the milk is varied with each company. The microwave transmission line approach with horn antenna is introduced as an effective method for the assessment of milk for the first time with different frequency. The electrical permittivity is an intrinsic parameter of a material that can be used as an index of delivered water content. For the permittivity calculation, we use horn antenna transmitter and receiver in microwave frequency .The microwave travelled via the milk according to its thickness. A design of horn antenna and its minimum distance transmission length is followed to evaluate the thickness of milk. The dissipated power is calculated with the help of VSWR meter in decibel. The results are plotted with different microwave frequency with unique wave length with unique concentration of water with milk. Mat lab is used to plot the graph. The effects exhibit that the milk thickness makes the wave travel of microwave produces the decibel value changes at the output. The measurements demonstrate that the permittivity of milk increases with increased added water. A relationship between the added water content and the permittivity of milk -water mixture is established, which should be a powerful tool for detecting milk thickness.
Volume: 7
Issue: 2
Page: 77-81
Publish at: 2018-08-01

Non-uniform Rooftop PVs Distribution Effect to Improve Voltage Profile in Residential Feeder

10.12928/telkomnika.v16i4.7789
Zamzami; Politeknik Negeri Lhokseumawe Zamzami , Nelly; Politeknik Negeri Lhokseumawe Safitri , Fauzi; Politeknik Negeri Lhokseumawe Fauzi
This paper presents the simple design of a grid-tied single-phase with distributed rooftop photovoltaic (PV) non-uniformly location and ratings. All the inclusion components in the developed scheme are estimated and defined as the inevitability of low voltage (LV) residential network. This developed scheme is purposed for allocating AC and DC load, which are divided into four steps: the sized determination of PV inverter (1-5kW), the selection of PV array, the size determination of battery and the selection of other supporting components. The purposed configuration consists of modeling the system with non-uniform distributions of rooftop PVs, modeling the rooftop PVs based on their injected active and reactive power, and finally the inclusion of battery storage, based on its state of charge (SOC). Due to test the configuration, several cases are built in the MATLAB platform. Simulation results have been generated and analyzed for an unbalanced three-phase residential feeder which is populated with rooftop PVs and battery storage (BS). The simulation results show that the unbalanced reduction due to the coordinate of PVs and BS that provided educated energy storage when the unequal loadings are there, have significant effect toward the anxiety of the distribution network are successfully done.
Volume: 16
Issue: 4
Page: 1388-1395
Publish at: 2018-08-01

Pattern Analysis of Goals Scored in Malaysia Super League 2015

10.11591/ijeecs.v11.i2.pp718-724
Nazim Razali , Aida Mustapha , Filipe Manuel Clemente , Md Fauzi Ahmad , Mohamad Aizi Salamat
This paper is set to study the pattern of goals scored across 132 matches in 2015 Malaysian Super League (MSL). Despite of well-known researches in European football, no information in Malaysian football teams has been done consistently. To identify the patterns, this research focuses on goals scored based on timing that includes scoring frequency, the impact of first goal achieved by team towards the final match outcome, as well as the impact of having home advantage for matches during MSL 2015.  The findings of this paper will provide useful information on MSL besides helping coaches with fresh insight for creating effective training and tactical plan as the time progressed during match. At the same time, players will also be more prepared for a consistent performance especially when training for matches as the visiting teams.
Volume: 11
Issue: 2
Page: 718-724
Publish at: 2018-08-01

Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Applications

10.12928/telkomnika.v16i4.9064
Murtala Aminu; Universiti Teknologi Malaysia (UTM) Baba , Mohammad Kamal A; Universiti Teknologi Malaysia (UTM) Rahim , Farid; Universiti Teknologi Malaysia (UTM) Zubir , Mohd Fairus Mohd; Universiti Teknologi Malaysia (UTM) Yusoff
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499). Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501), and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR) with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz; 115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN 5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless communication systems due to its simplicity in design, compactness and miniaturization.
Volume: 16
Issue: 4
Page: 1838-1845
Publish at: 2018-08-01

A Model to Predict The Live Bodyweight of Livestock Using Back-Propagation Algorithm

10.12928/telkomnika.v16i4.6716
Inggih; University of Sultan Syarif Kasim Riau Permana , Ria; University of Sultan Syarif Kasim Riau Agustina , Endah; University of Sultan Syarif Kasim Riau Purnamasari , Febi Nur; University of Sultan Syarif Kasim Riau Salisah
Cattle is the most popular livestock in Indonesia. Assessments of the live bodyweight of cattle can be conducted through weighing or predicting. Weighing is an accurate method, but it is not efficient due to the prices of scales that most traditional farmers cannot afford. Prediction is a more affordable technique however occurrences of error remains high. To deal with this issue this research has created a model predicting the live bodyweight of cattle through Back-Propagation algorithm. There are four morphometric variables examined in this study: (1) body length; (2) withers height; (3) chest girth; and (4) hip width. Based on comparative results with conventional prediction methods, Schoorl Indonesia and Schoorl Denmark, showed that the method offered has a lower error. Rate of error is 60.54% lower than Schoorl Denmark and 53.95% lower than Schoorl Indonesia.
Volume: 16
Issue: 4
Page: 1667-1672
Publish at: 2018-08-01

A Novel Forecasting Based on Automatic-optimized Fuzzy Time Series

10.12928/telkomnika.v16i4.8430
Yusuf Priyo; Brawijaya University Anggodo , Wayan Firdaus; Brawijaya University Mahmudy
In this paper, we propose a new method for forecasting based on automatic-optimized fuzzy time series to forecast Indonesia Inflation Rate (IIR). First, we propose the forecasting model of two-factor high-order fuzzy-trend logical relationships groups (THFLGs) for predicting the IIR. Second, we propose the interval optimization using automatic clustering and particle swarm optimization (ACPSO) to optimize the interval of main factor IIR and secondary factor SF, where SF = {Customer Price Index (CPI), the Bank of Indonesia (BI) Rate, Rupiah Indonesia /US Dollar (IDR/USD) Exchange rate, Money Supply}. The proposed method gets lower root mean square error (RMSE) than previous methods.
Volume: 16
Issue: 4
Page: 1809-1817
Publish at: 2018-08-01

Beam Steering using the Active Element Pattern of Antenna Array

10.12928/telkomnika.v16i4.9040
Norun Abdul; International Islamic University Malaysia Malek , Othman Omran; International Islamic University Malaysia Khalifa , Zuhairiah Zainal; Universiti Tun Hussein Onn Malaysia (UTHM) Abidin , Sarah Yasmin; International Islamic University Malaysia Mohamad , Nur Aqilah Abdul; International Islamic University Malaysia Rahman
An antenna array is a set of a combination of two or more antennas in order to achieve improved performance over a single antenna. This paper investigates the beam steering technique using the active element pattern of dipole antenna array. The radiation pattern of the array can be obtain by using the active element pattern method multiplies with the array factor. The active element pattern is crucial as the mutual coupling effect is considered, and it will lead to an accurate radiation pattern, especially in determining direction of arrival (DoA) of a signal. A conventional method such as the pattern multiplication method ignores the coupling effect which is essential especially for closely spaced antenna arrays. The comparison between both techniques has been performed for better performance. It is observed that the active element pattern influenced the radiation pattern of antenna arrays, especially at the side lobe level. Then, the beam of the 3x3 dipole antenna array has been steered to an angle of 60° using three techniques; Uniform, Chebyshev and Binomial distribution. All of these are accomplished using CST and Matlab software.
Volume: 16
Issue: 4
Page: 1542-1550
Publish at: 2018-08-01

Comparative Study Improving Residential Load Factor Using Power Shifting and Load Shifting

10.12928/telkomnika.v16i4.7715
Hartono; Politeknik Negeri Bandung BS , Sri Paryanto; Politeknik Negeri Bandung Mursid , Sapto; Politeknik Negeri Bandung Prajogo
One the problem of electric power stability is due to load fluctuations in distribution system especialy during peak load conditions. One solution which is applied in Smart Grid scheme is through load shifting or power shifting. In load shifting the load with high power consumption which operates at peak load shifted its operations outside of the peak load or s some loads with high power consumption do not operate at the same time, there is a load whose operating time is shifted to reduce peak power. Power shifting is used when energy from renewable source not directly suplied to load but storage first and supplied to reduce high power consumption to reduce peak power. Low load factor, ratio between average power to peak power, may affect to power system operation. If load factor of residential load can keep in low, it will be certainly help improve the stability of the power system. In this study we will examine the comparison of load shifting method with power shifting in improving load factor. Load shifting is done to water pumps and washing machines, because washing machine is shiftable load. Power shifting is made to the output power of the solar power plant, which is used to reduce peak power from the water pump. Test results show that power shifting can increase load factor value up to 54,9% while load shifting give load factor value equal to 43,9%.
Volume: 16
Issue: 4
Page: 1396-1403
Publish at: 2018-08-01

Bi-directional Beams Waveguide Slotted Antenna at Millimeter Wave

10.12928/telkomnika.v16i4.9057
Muataz W.; University Technology Malaysia Sabri , Noor A.; University Technology Malaysia Murad , Mohammed K.A.; University Technology Malaysia Rahim
This paper focused on designing a bi-directional beams waveguide slotted antenna at millimetre wave spectrum. Waveguide slotted antenna is known for its highly directional pattern. By having bi-directional pattern, the capacity of system coverage can be expanded. The design is implemented by using antenna slot theory on a waveguide structure. The slotted are made on two wall surfaces and the performance is compared to the slotted on single wall. The two models designs are simulated using Computer Simulation Technology (CST) microwave software. The simulation results show that both models operate at 30 GHz with minimum reflection coefficient of -24.63 and -25.01 dB respectively. The two models achieved a fair high gain at 15.5 dB and 13.3 dB with directional beamwidth of 8.9 degree. The proposed bi-directional beams structure achieved a comparable gain in both directions when compared to the single direction.
Volume: 16
Issue: 4
Page: 1515-1521
Publish at: 2018-08-01

Applied Healthcare Knowledge Management for Hospital in Clinical Aspect

10.12928/telkomnika.v16i4.5673
Sevenpri; Bina Nusantara University Candra , Ichsan Kurniawan; Bina Nusantara University Putrama
Medical industry uses the information as a critical factor in running the three aspects of hospital management which includes administrative, financial and clinical. Objectives to be achieved is to identify healthcare knowledge resources and models of knowledge sharing, identifying culture, strategy and knowledge management supporting facilities, plotting knowledge resources and mapping supporting features of knowledge portals as well as doing analysis and design of healthcare knowledge management portal that developed.In achieving the purpose of analysis and design of healthcare knowledge management portal, is done through several stages of the methodology, where the identification process carried out primary and secondary data collection, while the analysis on the management aspects was performed cultural analysis with OCAI methods and the analysis and design of information systems with OOAD approach using UML models. PELNI Hospital is using for this case study. From analysis and design of healthcare knowledge management portal is expected to get a picture of the current organizational culture and the expected culture, the description of network infrastructure and organizational strategies related to resource and knowledge destination to produce a Knowledge Management Portal.
Volume: 16
Issue: 4
Page: 1760-1770
Publish at: 2018-08-01

WCLOUDVIZ: Word Cloud Visualization of Indonesian News Articles Classification Based on Latent Dirichlet Allocation

10.12928/telkomnika.v16i4.8194
Retno; Universitas Diponegoro Kusumaningrum , Satriyo; Universitas Diponegoro Adhy , Suryono; Universitas Diponegoro Suryono
Latent Dirichlet Allocation (LDA) is a widely implemented approach for extracting hidden topics in documents generated by soft clustering of a word based on document co-occurrence as a multinomial probability distribution over terms. Therefore, several visualizations have been developed, such as matrices design, text-based design, tree design, parallel coordinates, and force-directed graphs. Furthermore, based on a set of documents representing a class (category), we can implement classification task by comparing topic proportion for each class and topic proportion for the testing document by using Kullback-Leibler Divergence (KLD). Therefore, the purpose of this study is to develop a system for visualizing the output of LDA as a classification task. The visualization system consists of two parts: bar chart and dependent word cloud. The first visualization aims to show the trend of each category, while the second visualization aims to show the words that represent each selected category in a word cloud. This visualization is subsequently called WCloudViz. It provides clear, understandable and preferably shared the result.
Volume: 16
Issue: 4
Page: 1752-1759
Publish at: 2018-08-01

Assessment Analytic Theoretical Framework Based on Learners’ Continuous Learning Improvement

10.11591/ijeecs.v11.i2.pp682-687
M. Hamiz , M. Bakri , Norhaslinda Kamaruddin , Azlinah Mohamed
Currently, university students are required to follow stringent curriculum structure regardless of their performance. Personalized learning is not being offered resulting the whole cohort must compy to a customized fixed curriculum design. This is because the designed curriculum does not take into account different students’ attainment. Furthermore, there is a mismatched between supply and demand of graduates’ skill sets to fulfil the requirement of industry. Due to these issues, employers face difficulties in finding suitable high-skilled worker which contributes to large number of unemployed graduates. Thus, a systematic intervention of students’ learning process is essential to construct informed and strategic responses in order to manage challenges and minimize skill mismatch, at the same time providing adequate fundamental knowledge. In this paper, an assessment analytics framework is proposed based on automated extracted skill sets from curriculum documents and individual performance to recommend adaptive learners’ learning system (ALLS). By preparing the graduates with the required industry skill sets, the graduates’ unemployment rate is envisaged to reduce.
Volume: 11
Issue: 2
Page: 682-687
Publish at: 2018-08-01
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