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Control of a stand-alone photovoltaic/battery bank system to supply energy to resistance load

10.11591/ijape.v8.i1.pp93-100
G. Giftson Samuel , M. Muthuramaligam , P. S. Manoharan , C. Christober Asir Rajan
In this paper, supervisor control for stand-alone hybrid power system to supply energy to resistance load is presented. The hybrid system is used to produce energy withoutinterruption and it consists of a photovoltaic generator (PV), and a battery bank. PV system work in parallel via DC/DC converter and the battery bank is used to store the excess of energy. The mathematical model topology, the identification of each subsystem and the control supervision of theglobal system are the contribution of this paper. Obtained results under Matlab/Simulink presented and discussed.
Volume: 8
Issue: 1
Page: 93-100
Publish at: 2019-04-01

Terminal voltage and power regulation using vehicle-to-grid (V2G) schemes integrated to smart interconnected power system

10.11591/ijape.v8.i1.pp61-68
Tarek Hassan Mohamed , Abdel-moamen Mohammed Abdel-Rahim
This paper is an attempt to use the vehicle-to-grid (V2G) connected system to play an effective job in the regulation of the voltage and power of the power system besides its positive effect for the system frequency. A two area power system is used to measure the effectiveness of the proposed V2G scheme. The proposed system is tested under the step load change condition and three phase short system case. A comparison between the system with proposed V2G schemes and that system without V2Gs is carried out showing the importance of the presence of the V2G schemes on system frequency, terminal voltage and total power. MATLAB /SIMULINK software package is used as a test environment.
Volume: 8
Issue: 1
Page: 61-68
Publish at: 2019-04-01

Improved virtual flux direct power control of three phase PWM rectifier using SOGI-FLL estimator under disturbed voltage conditions

10.11591/ijape.v8.i1.pp34-42
A Rahab , H Benalla , F Senani
In this paper, improved sonsorless direct power control (DPC) of three-phase rectifiers is presented. The new system are based on virtual flux (VF) and notch filter using Second Order Generalized Integrator frequency located loop SOGI-FLL estimator. In order to improve the VF-DPC performance of PWM rectifier, an improved observation method of virtual flux-linkage is proposed. To avoid the relevant problems of pure integrator, and to achieve the accurate observation of the grid voltage’s phase, (SOGI-FLL) are used to displace the pure integrator. Theoretical principles of this method are presented and discussed. These strategies are also investigated under disturbed grid voltage. A theoretical analysis of active and reactive power under a non-ideal source is clearly demonstrated. In order to calculate the compensated powers, the extraction of positive, negative, and harmonic sequences of voltage and current is needed and a multiple dual SOGI-FLL method is used for rapid and accurate extraction. It is shown that the VFDPC with integrating notch filter exhibits several advantages, particularly providing small ripple of DC-link voltage and sinusoidal line current when the supply voltage is not ideal.
Volume: 8
Issue: 1
Page: 34-42
Publish at: 2019-04-01

Systematic review of aspects of DDoS attacks detection

10.11591/ijeecs.v14.i1.pp155-168
Silvia Bravo , David Mauricio
Distributed Denial of Service attacks (DDoS) are one of the biggest problems facing the Internet. To eliminate this type of attack, the number of which has increased in the period under study, various methods of defense have been proposed. However a detection mechanism that is able to completely counteract the attacks has not yet been found. Therefore, detection and defense against DDoS attacks is of great importance for specialists engaged in computer security. This paper presents a systematic review of the scientific literature on methods of detecting DDoS attacks. From the literature the main aspects related to detection have been formulated. Six aspects for analysis in this investigation were identified: techniques, variables, tools, deployment location, point in time and detection accuracy. It was found that each technique used for the detection of attacks exploits certain characteristics of the network traffic, user requests and specific tools. Finally, it managed to identify the mechanisms that have the highest detection accuracy, such as the datasets they use. It has been concluded that an adequate analysis of the above aspects of detection of DDoS attacks can make a useful contribution to designing an appropriate strategy for neutralizing the attacks.
Volume: 14
Issue: 1
Page: 155-168
Publish at: 2019-04-01

Systemic approach for optimizing information technology resource as a contribution of information system governance

10.11591/ijeecs.v14.i1.pp135-142
Noureddine Falih , Brahim Jabir , Khalid Rahmani
 Information technology (IT) resource management is considered as one of the main pillars of Information System (IS) governance in the company. In this article, we propose a systemic approach from the structural paradigm based essentially on the formal extension of the ISO 19440 Meta-model. This structure contains specific constructs from the Cobit framework and system tools as the Galois lattices, likely to bring a better vision of the use of IT resource in the company. This technique allows a systemic analysis applied to special structural matrices to evaluate the deployment mode of IT resource to achieve business processes. Such approach allows a good optimization of IT resource as a pragmatic and effective contribution to Information System governance.
Volume: 14
Issue: 1
Page: 135-142
Publish at: 2019-04-01

Face recognition smart cane using haar-like features and eigenfaces

10.12928/telkomnika.v17i2.11772
Gita Indah; Telkom University Hapsari , Giva Andriana; Telkom University Mutiara , Husein; Telkom University Tarigan
Visually impaired has the limitation in interacting with another human. They usually use the sense of hearing and touching their face to recognize human. Face recognition is a technology that can be used to solve this problem. This paper develops a smart cane function by integrated face recognition feature on the cane using Haar-Like features and Eigenfaces. This paper proposed a portable, real time, and wearable product. Raspberry Pi supports portability that affects the delay and computing speed of face recognition algorithms. Utilization of Raspi camera on the eyes glasses is for wearable purposes. Voice output provides information on whether the face is caught on camera or not. This prototype works well during the face detection and recognition process. It needs 3 seconds for one-face recognized in range 0.25 until 1.5 meters from the camera, until the sound and information are generated. It needs is me 5 second for two faces recognized and 10 seconds for 3 faces recognized by a system in the same range between face and the camera. The accuracy reaches 91.67% for the up-right position face but for other position the accuracy is only 18% until 32%.
Volume: 17
Issue: 2
Page: 973-980
Publish at: 2019-04-01

Novel pH sensor based on fiber optic coated bromophenol blue and cresol red

10.12928/telkomnika.v17i2.9993
Fredy; Institut Teknologi Sepuluh Nopember Kurniawan , Baginda; Institut Teknologi Sepuluh Nopember Zulkarnain , Mohammad Teguh; Institut Teknologi Sepuluh Nopember Hermanto , Hendro; Institut Teknologi Sepuluh Nopember Juwono , Muhammad; Institut Teknologi Sepuluh Nopember Rivai
Fabrication of pH sensor based on fiber optic coated bromophenol blue and cresol red has been done. Briefly, jacket in the middle part of the fiber optic was removed for 5 cm. Then the core of each of fiber optics was washed in ethanol. Nitric acid, demineralized water, and ethanol again consecutively. Then the cleaned core was coated using active material using sol-gel immobilization technique. Tetraehyl orthosilicate was used as a binder in the immobilization of active materials. Bromophenol blue will start change the color to yellow at below pH 3.00±0.01 and blue at above pH 4.60±0.01, while the cresol red will start change the color to yellow at below pH 7.20±0.01 and violet at above pH 8.80±0.01. The pH sensors which have been made show the sigmoidal response over pH from 1.00±0.01 to 11.00±0.01. The sensor has a better performance in comparation with the other sensor.
Volume: 17
Issue: 2
Page: 907-914
Publish at: 2019-04-01

Time and cost optimization of business process RMA using PERT and goal programming

10.12928/telkomnika.v17i2.11792
Gita Intani; Institut Teknologi Sepuluh Nopember Budiawati , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno
As a company engaged in the distribution of wireless devices, Return Material Authorization (RMA) is a mandatory service that must be owned by the company. RMA is a part of the process of returning a product to receive a refund, replacement, or repair during the product’s warranty period. The business process of RMA used functionally design, which is not considered to be effective in terms of time and cost for the company of 2880 minutes for IDR 348242. In this research, Project Evaluation and Review Technique (PERT) was used to select the optimal traces; to optimize time and cost, the researcher used goal programming. This technique allows the creation of a controlled and orderly activity because the schedule and budget of a job are predetermined prior to the implementation. The optimization results show that the process time is reduced by 50% and the cost is reduced by almost 55% which show improvement on the performance of the business processes.
Volume: 17
Issue: 2
Page: 781-787
Publish at: 2019-04-01

A novel UWB reconfigurable filtering antenna design with triple band-notched characteristics by using u-shaped coppers

10.11591/ijeecs.v14.i1.pp267-275
I.D. Saiful Bahri , Z. Zakaria , N. A. Shairi , N. Edward
This paper proposed an UWB antenna with triple reconfigurable notch filters. By presenting there U-shaped coppers in the design, the potential triple interference in UWB applications can be rejected. Six PIN diodes are putted on the coppers to represent the OFF and ON tunable status in order to add reconfigurable characteristics to the UWB antenna. By using this ON and OFF tunable method, the current distribution of the proposed design changes and enables the antenna to have eight operation modes. The results prove that the proposed design can operate over the entire UWB frequency range (3.1 GHz to 10.6 GHz) and can filter out the target signals from the WLAN upper band (5.725 to 5.825 GHz), WLAN lower band (5.15 to 5.35 GHz) and X band frequency system (7.9 to 8.4 GHz) in one of the tunable configurations.
Volume: 14
Issue: 1
Page: 267-275
Publish at: 2019-04-01

An artificial neural network approach for detecting skin cancer

10.12928/telkomnika.v17i2.9547
Sugiarti; Universitas Muslim Indonesia Sugiarti , Yuhandri; Universitas Putra Indonesia YPTK Yuhandri , Jufriadif; Universitas Putra Indonesia YPTK Na'am , Dolly; Universitas Muslim Indonesia Indra , Julius; Universitas Putra Indonesia YPTK Santony
This study aims to present diagnose of melanoma skin cancer at an early stage. It applies feature extraction method of the first order for feature extraction based on texture in order to get high degree of accuracy with method of classification using artificial neural network (ANN). The method used is training and testing phases with classification of Multilayer Perceptron (MLP) neural network. The results showed that the accuracy of test image with 4 sets of training for image not suspected of melanoma and melanoma with the lowest accuracy of 80% and the highest accuracy of 88.88%, respectively. The 4 sets of training used consisted of 23 images. Of the 23 images used as a training consisted of 6 as not suspected of melanoma images and 17 as suspected melanoma images.
Volume: 17
Issue: 2
Page: 788-793
Publish at: 2019-04-01

Influence of input power in Ar/H2 thermal plasma with silicon powder by numerical simulation

10.12928/telkomnika.v17i2.10533
Yulianta; Kanazawa University University of Sumatera Utara Siregar , Yasunori; Kanazawa University Tanaka , Yoshihiko; Kanazawa University Uesugi , Tatsuo; Kanazawa University Ishijima
Numerical simulation in inductively coupled thermal plasma was made on the temperature distribution in argon (Ar)+hydrogen (H2) induction thermal plasma torch with silicon (Si) powder injection to obtain the temperature distribution and gas flow fields. The ICTP model was used in this research because it has benefit of good repeatability and no contamination process. Interactions between ICTP and injected powder are very complicated to be understood only by related experiments. Influence of input power in ICTP was numerically investigated on thermal plasma temperature fields and powder evaporation. The temperature distributions of thermal plasma and Si vapor distribution were compared at input powers of 20 kW, 30 kW, and 40 kW. Results indicated that higher input power increases the temperature of the thermal plasma with doughnut shape but it slightly enhances evaporation of the powder at the center axis of the plasma torch.
Volume: 17
Issue: 2
Page: 1047-1054
Publish at: 2019-04-01

Application of gabor transform in the classification of myoelectric signal

10.12928/telkomnika.v17i2.9257
Jingwei; Universiti Teknikal Malaysia Melaka Too , A. R.; Universiti Teknikal Malaysia Melaka Abdullah , N. Mohd; Universiti Teknikal Malaysia Melaka Saad , N. Mohd; Universiti Teknikal Malaysia Melaka Ali , T. N. S.; Universiti Teknikal Malaysia Melaka Tengku Zawawi
In recent day, Electromyography (EMG) signal are widely applied in myoelectric control. Unfortunately, most of studies focused on the classification of EMG signals based on healthy subjects. Due to the lack of study in amputee subject, this paper aims to investigate the performance of healthy and amputee subjects for the classification of multiple hand movement types. In this work, Gabor transform (GT) is used to transform the EMG signal into time-frequency representation. Five time-frequency features are extracted from GT coefficient. Feature extraction is an effective way to reduce the dimensionality, as well as keeping the valuable information. Two popular classifiers namely k-nearest neighbor (KNN) and support vector machine (SVM) are employed for performance evaluation. The developed system is evaluated using the EMG data acquired from the publicy available NinaPro Database. The results revealed that the extracting GT features can achieve promising performance in the classification of EMG signals.
Volume: 17
Issue: 2
Page: 873-881
Publish at: 2019-04-01

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
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