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30,609 Article Results

Thermal Effect of Wind Generation on Conventional Generator in a Microgrid

10.11591/ijeecs.v10.i3.pp890-896
Azmi Hashim , Kwok L Lo
In order to reduce CO2 emissions, which is one of the key strategy in combatting global warming, development of wind energy technology as source of renewable energy has become more important globally. However, the variability of the wind speeds leads to the intermittent nature of wind power generation. The conventional generators in the system must be able to compensate this fluctuation to maintain system stability and meet the load demand in the grid. This in turn may increase the temperature of the conventional generators beyond what normally occurs without wind generation in the grid. The aim of the paper is to inestigate the effect of thermal heating of the generators due to the variable output of wind generation in different time of the year in a microgrid by proposing proper modelling in the simulation. The simulations are done in 24 hours period in four different time of the years corresponding to different seasons of the year.
Volume: 10
Issue: 3
Page: 890-896
Publish at: 2018-06-01

Face Recognition on Linear Motion-blurred Image

10.12928/telkomnika.v16i3.5480
Fergyanto E.; Bina Nusantara University Gunawan , Jeklin; Bina Nusantara University Harefa , Nobumasa; Toyohashi University of Technology Sekishita
Most face recognition algorithms are generally capable to achieve a high level of accuracy when the image is acquired under wellcontrolled conditions. The face should be still during the acquisition process; otherwise, the resulted image would be blur and hard for recognition. Enforcing persons to stand still during the process is impractical; extremely likely that recognition should be performed on a blurred image. It is important to understand the relation between the image blur and the recognition accuracy. The ORL Database was used in the study. All images were in PGM format of 92 × 112 pixels from forty different persons, ten images per person. Those images were randomly divided into training and testing datasets with 50-50 ratio. Singular value decomposition was used to extract the features. The images in the testing datasets were artificially blurred to represent a linear motion, and recognition was performed. The blurred images were also filtered using various methods. The accuracy levels of the recognition on the basis of the blurred faces and filtered faces were compared. The performed numerical study suggests that at its best, the image improvement processes are capable to improve the recognition accuracy level by less than five percent.
Volume: 16
Issue: 3
Page: 1249-1255
Publish at: 2018-06-01

The Prediction of Optimal Route of City Transportation Based on Passenger Occupancy using Genetic Algorithm: A Case Study in The City of Bandung

10.12928/telkomnika.v16i3.7077
Sri Suryani; Telkom University Prasetiyowati , Yuliant; Telkom University Sibaroni , Derwin; Telkom University Prabangkara
Currently, the existence of city transport is increasingly eliminated by private vehicles such as cars and motorcycles. This situation is further exacerbated by the behavior of city transport drivers who are less discipline in driving, or in picking up and dropping off their passengers. The bad behavior is partly caused by the low level of passenger occupancy. The drivers try to search for passengers as much as possible but often ignore the traffic rules. To overcome this problem, an optimal transport route with high passenger potential is required. Therefore, this study investigated the optimal route of city transport based on the passenger occupancy rate in the city of Bandung as the case study. The method employed for determining the optimal route is Genetic algorithm combined with Ordinary Kriging method used for the process of passenger prediction and fitness calculation. The optimal routes are those with higher occupancy rate. The analysis results showed that the use of the Genetic algorithm with a low number of generations succeed in creating new optimal routes even though the increase is not too high the maximum only reaches 4%.This result is certainly important enough to be used in making better public transport routes.
Volume: 16
Issue: 3
Page: 1201-1207
Publish at: 2018-06-01

Synchronous Mobile Robots Formation Control

10.12928/telkomnika.v16i3.8397
Mohd Razali; Universiti Teknikal Malaysia Melaka Mohamad Sapiee , Khalil Azha; Universiti Teknikal Malaysia Melaka Mohd Annuar
Synchronous mobile robots formation control is one of the most challenging and interesting fields in robotics. The mobile robots communicate with each other through wireless communication to perform similar movement. This study analyzed two mobile robots that can perform synchronous movement along a shaped path. A square shape is set as a path for the mobile robot movements. The front robot being the leading robot transmits the instruction of its movement to the robot behind it, acting as the following robot through a wireless communication. The instruction sent by the leading robot is received by the following robot through a program embedded in the leading robot microcontroller which then drives the following robot to move and imitates the movement of the leading. The algorithm for the movement is tested on the hardware and the results of the experiment are included to verify the effectiveness of the proposed method.
Volume: 16
Issue: 3
Page: 1183-1192
Publish at: 2018-06-01

Algorithm to Convert Signal Interpreted Petri Net Models to Programmable Logic Controller Ladder Logic Diagram Models

10.11591/ijeecs.v10.i3.pp905-916
Z. Aspar , Nasir Shaikh-Husin , M. Khalil-Hani
Signal Interpreted Petri Nets (SIPN) modeling has been proposed as an alternative to Ladder Logic Diagram (LLD) modeling for programming complex programmable logic controllers (PLCs) due to its high level of abstraction and functionalities. This paper proposes an algorithm to efficiently convert existing SIPN models to their LLD models equivalences. In order to automate and speed up the conversion process, matrix calculation approach is used. A complex SIPN model was used to show that existing conversion technique must be expanded in order to cater for a more complex SIPN models.
Volume: 10
Issue: 3
Page: 905-916
Publish at: 2018-06-01

Interpretability Evaluation of Annual Mosaic Image of MTB Model for Land Cover Changes Analysis

10.12928/telkomnika.v16i3.9331
Muhammad; Ministry of Research, Technology, and Higher Education; and University of Indonesia Dimyati , Ratih Dewanti; LAPAN and Gadjah Mada University Dimyati , Kustiyo; LAPAN Kustiyo , Projo; LAPAN and Gadjah Mada University Danoedoro , Hartono; LAPAN and Gadjah Mada University Hartono
To verify whether the annual mosaic image of MTB model is acceptable for further digital analysis, it is necessary to evaluate the visual interpretability. The MTB model is an effort to integrate multi-scene and multi-temporal data, to obtain a minimum cloud cover mosaic image in locations that are often covered by clouds and haze. This study is to evaluate the interpretability of the annual mosaic image for analysis of the land cover changes. The data used are the images of 2015, 2016, and 2017 covers a part of central Sumatra. Visual interpretations with a series of steps are used, starting with identification of the objects using interpretation keys, followed by spectral band correlations, scattergram analysis, and ended by consistency assessment. The consistency assessment step is performed to determine the level of clearness and easiness of the object recognition in the annual mosaic images. The results showed that the most optimal spectral bands used for RGB combinations for visual interpretation were Band SWIR-1, Band NIR, and Band Red. Based on the evaluation results, the annual mosaic image of MTB model performed the consistent results of the clearness objects and the easiness of the object recognition. Thus the annual mosaic image of MTB model of 0.02x0.02 degree tile is acceptable for further digital processing as well as digital land cover analysis.
Volume: 16
Issue: 3
Page: 934-945
Publish at: 2018-06-01

A New CMOS Fully Differential Low Noise Amplifier for Wideband Applications

10.12928/telkomnika.v16i3.7630
Majid; University of Birjand Takbiri , Hadi; University of Birjand Zarei , Abolfazl; University of Birjand Bijari
In this paper, a multi-stage fully differential low noise amplifier (LNA) has been presented for wideband applications. A common-gate input stage is used to improve the input impedance matching and linearity. A common-source stage is also used as the second stage to enhance gain and reduce noise. A shunt-shunt feedback is employed to extend bandwidth and enhance linearity. The proposed low noise amplifier has been designed and simulated using RF-TSMC 0.18 μm CMOS process technology. In frequency band of 3.5-7.5 GHz, this amplifier has a flat power gain (S21) of 16.5 ± 1.5 dB, low noise figure (NF) of 3dB, input (S11) and output (S22) return losses less than -10 dB and high linearity with input thirdorder intercept point (IIP3) of -3dBm. It’s power consumption is also less than 10 mw with low power supply voltage of 0.8v.
Volume: 16
Issue: 3
Page: 1083-1091
Publish at: 2018-06-01

A Review of Hybrid Battery Management System (H-BMS) for EV

10.12928/telkomnika.v16i3.8743
Nur Huda; Universiti Teknikal Malaysia Melaka Mohd Amin , Mohd Ruddin; Universiti Teknikal Malaysia Melaka Ab Ghani , Auzani; Universiti Teknikal Malaysia Melaka Jidin , Zanariah; Universiti Teknikal Malaysia Melaka Jano , Tole; Universitas Ahmad Dahlan Sutikno
Significant to a major pollution contributor in passenger vehicles, electric vehicles are more acceptable to use on the road. Electric Vehicles (EVs) burn energy based on the usage of the battery. The usage of the battery in EVs is monitored and controlled by Battery Management System (BMS). A few factors monitor and control Battery Management System (BMS). This paper reviewed the battery charging technology and Remote Terminal Unit (RTU) development as a Hybrid Battery Management System (H-BMS) for Electric Vehicle (EV).
Volume: 16
Issue: 3
Page: 1004-1012
Publish at: 2018-06-01

Selecting User Influence on Twitter Data Using Skyline Query under MapReduce Framework

10.12928/telkomnika.v16i3.4624
Ahmad Luky; Institut Pertanian Bogor Ramdani , Taufik; Bogor Agricultural University Djatna , Heru; Bogor Agricultural University Sukoco
The aim of this research was to select and identify user influence on Twitter data. In identification stage, the method proposed in this study was matrix Twitter approach, sentiment analysis, and characterization of the opinion leader. The importan characteristics included external communication, accessibility, and innovation. Based on these characteristics and information from Twitter data through matrix Twitter and sentiment analysis, a algorithm of skyline query was constructed for the selection stage. Algorithm of skyline query selected user influence by comparing with other users according to values of each characteristic. Thus, user influence was indicated as user that was not influenced by other users in any combination of skyline objects. The use of MapReduce framework model in identification and selection stage, support whole operation where Twitter had big size data and rapid changes. The results in identification and selection of user influence exhibited that MapReduce framework minimized the execution time, whereas in parallel skyline query could reveal user influence on the data.
Volume: 16
Issue: 3
Page: 1416-1425
Publish at: 2018-06-01

Smart Garage Implementation and Design Using Whatsapp Communication Media

10.12928/telkomnika.v16i3.8063
Rendy; Telkom University Munadi , Arief; Telkom University Rakhman , Doan; Telkom University Perdana
WhatsApp is a social networking app that serves as a communication medium. According to the Online Audience Measurement Standards named comScore, in 2017, WhatsApp application users in Indonesia amounted to 35.8 million people. As the most popular mobile application with the most users in the country, in this research the authors chose Whatsapp as a communication medium that will be integrated into one application of Internet of Things (IoT), that is Smart Garage. Smart Garage is a combination of information technology and computing technology that is applied to a house by relying on efficiency and device automation. The results of this research shows that it is better to use mobile data networks than using the wireless networks. The maximum delay when using mobile data is 7.5 s and 7.7 s when using wireless networks. The research using WhatsApp application still rare especially in the field of IoT.
Volume: 16
Issue: 3
Page: 1107-1113
Publish at: 2018-06-01

Improvement of Power Quality Using Fuzzy Controlled D-STATCOM in Distribution System

10.11591/ijai.v7.i2.pp83-89
B. Santhosh Kumar , K.B. Madhu Sahu , K.B. Saikiran , CH. Krishna Rao
This paper investigates the problems associated with distribution system in terms of delivery of clean power and their solutions. Power quality has become a major issue in the present power system network. The network has mostly inductive nature.  This draws more reactive power.  This causes harmonics and voltage unbalance problems. So maintain the proper operation of interconnected power system, we are using one of the facts devices such as fuzzy controlled D-statcom. It provides suitable compensation and there by maintain proper power factor and also reduces harmonic contents.  The simulation is taken out by MATLAB/SIMULINK and the result shows the effectiveness of GA (Genetic algorithm) simulation. Optimized Fuzzy controlled D-STATCOM for improvement of power quality.
Volume: 7
Issue: 2
Page: 83-89
Publish at: 2018-06-01

The Effect of Tender Coconut Water on Free Radical Due to Mercury Exposure

10.11591/ijphs.v7i2.11849
Siti Thomas Zulaikhah , Joko Wahyu Wibowo
Mercury pollution can results from gold mining. Furthermore, a continuous mercury exposure can trigger the formation of Reactive Oxygen Species (ROS) and interfere with the body's antioxidant metabolism. A high level of free radicals in the body can be characterized by a low level of an antioxidant enzyme. Prevention to avoid the impacts of mercury poisoning is better than treatment. Tender coconut water can eliminate ROS and improve antioxidant status. This study aimed to was to confirm that tender coconut water is able to decrease the free radical which is characterized by increased antioxidant enzyme GPx status. This study was designed as randomized pre- and posttest control group design, 40 traditional gold mining workers devided into 2 groups: the control and treatment groups. After the pre test of GPx level, the workers were either given tender coconut water at the dose of 450 m L or water for 4 weeks every day. Four weeks after the pre-test, the level of GPx was assessed in the laboratory PAU-Gajahmada University. The post test results of the control group and treatments group were compared and analyzed using Man Whitney test. The mean levels of GPx post-test in the control group and treated group were 63.5±1.1 U/mL and 79.9±8.8 U/mL respectively. The analysis result obtained p-value 0.000 <0.05. Tender coconut water has an effect on free radicals due to to mercury exposure. Tender coconut water can be consumed daily to prevent degenerative diseases caused by mercury exposure.
Volume: 7
Issue: 2
Page: 102-106
Publish at: 2018-06-01

Trajectory and Determinant of Functional Independence among Patient with Traumatic and Non-Traumatic Spinal Cord Injury

10.11591/ijphs.v7i2.13249
Yudha Mathan Sakti , Astri Ferdiana , Dananjaya Putramega , Zikrina A. Lanodiyu , Galih Prasetya Sakadewa , Rahadyan Magetsari
The level of functional independence was directly proportional to life satisfaction and quality of life in patients with spinal cord injury. By knowing the determinants that predict changes in functional independence, medical treatment and rehabilitation can be better planned to improve the patient’s quality of life. We conducted a prospective cohort study on 49 patients with spinal cord injury at Dr. Sardjito general hospital Yogyakarta from April to June 2016. The data were taken before patient underwent surgery, before discharged from the hospital, and 3 months after underwent surgery. We found that most common spinal cord injury was at the level of lumbar vertebra with 28 patients (58%). There was a positive trajectory of the patients with spinal cord injury with ASIA grade B-E classification. However, patients with spinal cord injury with ASIA classification grade A have a neutral trajectory.We conclude there was a positive trajectory between functional independence and traumatic or non-traumatic spinal cord injury except in patients with ASIA grade A classification spinal cord injury. The determinants that affected the trajectory of patients with spinal cord injury were the level of the injured vertebra and severity of the neurological deficit. 
Volume: 7
Issue: 2
Page: 145-150
Publish at: 2018-06-01

Internet of Things based Smart Environmental Monitoring for Mushroom Cultivation

10.11591/ijeecs.v10.i3.pp847-852
Mohd Saiful Azimi Mahmud , Salinda Buyamin , Musa Mohd Mokji , M.S. Zainal Abidin
Environmental condition is a significant factor that needs to be controlled in mushroom production. Mushrooms are unable to grow if the temperature is higher than 33°C or lower than 25°C. Thus, this work focuses on developing an automatic environmental control system to provide optimum condition to mushroom production house. Environmental factors considered in the system are temperature, humidity and carbon dioxide. For this, DHT11 temperature humidity sensor and MQ135 CO2 sensor are connected to the ESP8266 Wi-Fi module to become IoT (Internet of Things) sensors that send big amount of data to the internet for monitoring and assessment. This enable users to monitor the environmental condition anywhere whenever accessing the internet. Based on the analysis of the data, the system will automatically on and off the irrigation system to put the temperature at an optimum level.
Volume: 10
Issue: 3
Page: 847-852
Publish at: 2018-06-01

Compact Meander Line Telemetry Antenna for Implantable Pacemaker Applications

10.11591/ijeecs.v10.i3.pp883-889
N. H. Sulaiman , N. A. Samsuri , M. K. A. Rahim , F. C. Seman , M. Inam
The demand for health technology is increasing rapidly especially in telemetry applications. These applications generally use implanted antennas to be utilized for data transfer from patients to another reader device. This procedure can make the health care more efficient, since it provides fast diagnosis and treatment to the patient. This work presents a design of telemetry antenna to be used in Pacemaker application in Medical Implant Communication Services (MICS) (401 MHz-406 MHz). By introducing Compact Meander Line Telemetry Antenna (CMLTA), length (Ls) and width (Ws) of substrate have been reduced by 36.84% and 40% respectively. The proposed antenna offers advantages of easy fabrications, low cost and light weight with a 133 MHz bandwidth.
Volume: 10
Issue: 3
Page: 883-889
Publish at: 2018-06-01
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