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29,922 Article Results

Analog circuit fault diagnosis via FOA-LSSVM

10.12928/telkomnika.v18i1.9627
Yu; Hunan University Wenxin
At present, the research on fault detection and diagnosis technology is very significant to improve the reliability of the equipment, which can greatly improve the safety and efficiency of the equipment. This paper proposes a new fault detection and diagnosis means based on the FOA-LSSVM algorithm. Experimental results demonstrate that the algorithm is effective for the detection and diagnosis of analog circuit faults. In addition, the model also demonstrate good generalization ability.
Volume: 18
Issue: 1
Page: 251-257
Publish at: 2020-02-01

Design and development of a method for detecting sleep roll-over counts using accelerometer ADXL335

10.11591/ijece.v10i1.pp477-485
Jonathan Acharya
Sleep plays an important role as it helps human body to rejuvenate, boosts mental function and manage stress. Sleep is restorative function which enhances muscle growth, repairs tissues, maintains health and make physical appearance look or feel better. The lack of sleep in human body can increase the risk of diseases which are asthma, diabetes, depression. For healthy physiological function, sleep is essential and has strong relation to mental condition. Easy way of sleep management is considered for maintaining good mental health. Numerous scientists, doctors and researchers have proposed various ways to monitor sleep, some of those best tests are polysomnography test and actigraphy test. However, taking sleep test covering the whole body with wires and electrodes which is polysomnography test is uncomfortable for patients, and sensors used for different approaches like this are costly and often require overnight treatment and expert monitoring in clinics. Therefore, easy way of detecting roll-over movements which is convenient for patients to wear is proposed. Accelerometer ADXL335 sensor is taped on socks during sleep which is comfortable for patients to wear and do not cause any inconvenience during sleep. Algorithm is proposed to read the dataset and count the roll-over during the sleep based on threshold. Resulting the number of roll-over detected during a sleep period.
Volume: 10
Issue: 1
Page: 477-485
Publish at: 2020-02-01

Overset grid generation with inverse scattering technique for object and crack detection

10.12928/telkomnika.v18i1.13187
Deanne Anak; Universiti Malaysia Sarawak Edwin , Shafrida; Universiti Malaysia Sarawak Sahrani , Kismet Anak; Universiti Malaysia Sarawak Hong Ping
This paper presents the forward backward time stepping (FBTS) technique with finite difference time domain (FDTD) method and overset grid generation (OGG) method was applied for the reconstruction of object and crack detection. Object and crack detection is widely used in structural health monitoring (SHM) application especially in civil structure to detect the buried object and also cracks. The proposed numerical approach has been validated by investigating different kind of ratio of grid size between the main mesh and sub-mesh. Then, the proposed numerical approach is implemented in the analysis of the detection of objects such as concrete blocks and cracks underground. Here, the numerical errors between the actual result and simulated result had been calculated by using relative error. It is shown that the proposed approach has 5.22% error and nearer to the actual value.
Volume: 18
Issue: 1
Page: 1-9
Publish at: 2020-02-01

A novel cross-coupled microstrip bandpass filter with hairpin-DGS resonators using coupling matrix technique

10.12928/telkomnika.v18i1.12447
Chetioui; University of AboubekrBelkaid of Tlemcen Mohammed , Bouasria; University of Dr. Moulay Tahar of Saïda Fatima , Damou; University of Dr. Moulay Tahar of Saïda Mehdi
This paper introduces a new design of a cross-coupled microstrip bandpass filter (MBPF) based on hairpin defected ground structure (DGS) resonators using accurate coupling matrix (CM) technique for microwave communication systems. The paper describes the equivalent circuit of the proposed MBPF based on the DGS equivalent circuit model derived from the equivalent inductance and capacitance which occur due to the perturbation of the current in the ground plane by the presence of the slots. The paper investigates also the different external coupling mechanisms that the feed configuration affects significantly the filter response. In this paper, a four order Chebyshev topology has been adopted for designing the filter to suppress harmonics and achieve a very compact size and a wide stopband with two transmission zeros.
Volume: 18
Issue: 1
Page: 465-475
Publish at: 2020-02-01

Optimized low voltage low power dynamic comparator robust to process, voltage and temperature variation

10.11591/ijeecs.v17.i2.pp783-792
Julie Roslita Rusli , Suhaidi Shafie , Roslina Mohd Sidek , Hasmayadi Abdul Majid , W. Z. Wan Hassan , M. A. Mustafa
Power consumption and speed are the main criteria in designing comparator for analog-to-digital converter (ADC).  This paper presents an optimized low voltage low power dynamic comparator which is robust to process, voltage and temperature (PVT) variations with adequate speed.  The comparator circuit was designed using 0.18µm CMOS technology with low voltage supply of 0.8V.  The method used to verify the robustness of the comparator circuit across 45 PVT is presented.  The circuit is simulated with 10% voltage supply variation, five process corners and temperature variation from 0°C to 100°C. The simulation result show that the proposed comparator circuit achieved significant reduction of power consumption and delay during worst case condition compared to dynamic comparator proposed from previous researchers.
Volume: 17
Issue: 2
Page: 783-792
Publish at: 2020-02-01

Improvement of voltage profile for large scale power system using soft computing approach

10.12928/telkomnika.v18i1.13379
Muhammad; Universitas Pertamina, Abdillah , Herlambang; Universitas Airlangga Setiadi , Danang Sulistyo
In modern power system operation and planning, reactive power is an important part of power system operation to supply electrical load such as an electric motor. However, the reactive current that flows from the generator to load demand can cause voltage drop and active power loss. Hence, it is essential to install a compensating device such as a shunt capacitor close to the load bus to reduce the total power loss of the transmission line and improve the voltage stability of the system. This paper presents the application of a genetic algorithm (GA), particle swarm optimization (PSO), and artificial bee colony (ABC)) to obtain the optimal size of the shunt capacitor where those capacitors are located on the critical bus. To examine the efficacy of the proposed algorithm, Java-Madura-Bali (JAMALI) 500kV power system grid is used as the test system. From the simulation results, the use of PSO and ABC algorithms to obtain the sizing of the capacitor’s capacity can reduce the power loss of around 15.873 MW. Moreover, a different result is showed by the GA approach where the power loss in the JAMALI 500kV power grid can be compressed only up to 15.54 MW or 11.38% from the power system operation without a shunt capacitor. The three soft computing techniques could also maintain the voltage profile within 1.05 p.u and 0.95 p.u.
Volume: 18
Issue: 1
Page: 376-384
Publish at: 2020-02-01

Development of online learning groups based on MBTI learning style and fuzzy algorithm

10.12928/telkomnika.v18i1.14922
Budi Laksono; Bandung Institute of Technology Putro , Yusep; Bandung Institute of Technology Rosmansyah , Suhardi; Bandung Institute of Technology Suhardi
Group development is an initial step and an important influence on learning collaborative problem solving (CPS) based on the digital learning environment (DLE). Group development based on the Myers-Briggs types indicators (MBTI) rule proved successful for the educational and industrial environment. The MBTI ideal group rules are reached when a group leader has the highest level of leadership and compatibility between group members. The level of leadership and suitability of group members is determined based on the MBTI learning style (LS). Problems arise when the population of MBTI LS with the highest level of leadership is over. This will lead to dual leadership problems and have an impact on group disharmony. This study proposes an intelligent agent software for the development of the ideal group of MBTI, using the Fuzzy algorithm. The intelligent agent was developed on the SKACI platform. SKACI is a DLE for CPS learning. Fuzzy algorithm for solving dual leadership problems in a group. Fuzzy algorithm is used to increase the population of MBTI LS to 3 levels, namely low, medium and high. Increasing the population of MBTI LS can increase the probability of forming an ideal group of MBTI. Intelligent agents are tested based on a quantitative analysis between experimental classes (applying intelligent agents), and control classes (without intelligent agents). Experiment results show an increase in performance and productivity is better in the experimental class than in the control class. It was concluded that the development of intelligent agents had a positive impact on group development based on the MBTI LS.
Volume: 18
Issue: 1
Page: 199-207
Publish at: 2020-02-01

Three-dimensional structure from motion recovery of a moving object with noisy measurement

10.11591/ijece.v10i1.pp117-128
Zoubaida Mejri , Lilia Sidhom , Afef Abdelkrim
In this paper, a Nonlinear Unknown Input Observer (NLUIO) based approach is proposed for three-dimensional (3-D) structure from motion identification. Unlike the previous studies that require prior knowledge of either the motion parameters or scene geometry, the proposed approach assumes that the object motion is imperfectly known and considered as an unknown input to the perspective dynamical system. The reconstruction of the 3-D structure of the moving objects can be achieved using just two-dimensional (2-D) images of a monocular vision system. The proposed scheme is illustrated with a numerical example in the presence of measurement noise for both static and dynamic scenes. Those results are used to clearly demonstrate the advantages of the proposed NLUIO.
Volume: 10
Issue: 1
Page: 117-128
Publish at: 2020-02-01

Low cost smart weather station using Arduino and ZigBee

10.12928/telkomnika.v18i1.12784
Zaid Khudhur; Al-Esraa University College Hussein , Hadi Jameel; Al-Mustafa University College Hadi , Mousa Riyadh; Al-Esraa University Collage Abdul-Mutaleb , Yaqeen Sabah; Al-Esraa University College Mezaal
This paper presents low cost-effective weather station with monitoring system by using ZigBee communication technique that serves as a communication channel by using hardware and sensors to transmit and receive data in the weather station system. Using ZigBee over the Bluetooth for the short coverage distance about (1-10 m) and over the (WLAN) (wireless local area network) or Wi-Fi, a WLAN has limitation like delay, lacking BW of the handover of a large amount of data, and some areas have no internet coverage. The system includes implementation and design for the weather station using Arduino Uno board and five sensors gives sixth reading data (rain state, wind level, air pressure, dust density, temperature and humidity). The data can be stored in SD card on receiving (clouding and main processing side) from more than one transmitter node (ZigBee Network). It can be retrieved the data in any time and date. Results showed the system has no delay and the data reputedly changing ever second with the new reading.
Volume: 18
Issue: 1
Page: 282-288
Publish at: 2020-02-01

IoT–smart contracts in data trusted exchange supplied chain based on block chain

10.11591/ijece.v10i1.pp438-446
S. Ganesh Kumar , A. Murugan , B. Muruganantham , B. Sriman
Internet of Things (IoT) assumes a critical part in the advancement of different fields. The IoT data trusted exchange in recent year extend of uses influence an awesome request and increasing scale. In such a platform, exchange the data sets that they require and specialist organization can search. However, the enough trust as the third-party mediators for data exchange in centralized infrastructure cannot provide. This paper proposes a blockchain for IoT data trusted exchange based on decentralized solution. In particular, the fundamental standards of blockchain in verify manner, individuals can communicate with each other without a confided in mediator intermediary. Blockchain enable us to have a distributed, digital ledger. IoT (Internet of Things) sensor devices (zigbee) utilizing blockchain technology to assert public availability of temperature records, tracking location shipment, humidity, preventing damage, data immutability. The sensor devices looking the temperature, location, damage of each parcel during the shipment to completely guarantee directions. In blockchain all data is got moved from one position to another, where a smart contract assesses against the product attributes. Ethereum blockchain and smart contracts atlast it gets through knowledge a design to be copied and presents its decentralized distributed digital ledger, auditable, transparent, features visually.
Volume: 10
Issue: 1
Page: 438-446
Publish at: 2020-02-01

Optimized image processing and clustering to mitigate security threats in mobile ad hoc network

10.12928/telkomnika.v18i1.13914
Ibrahim A.; Iraq- University of Pardubice Alameri , Jawad Kadhim; Almuthana University Mutar , Ameer N.; Kufa Universty Onaizah , Iftikhar Ahmed; School of computer science and technology Koondhar
Since there are provisions of many attributes that are not possible or difficult to follow by networks conventionally, mobile ad-hoc networks are extensively deployed. This application starts through the defense sectors, the sensory node presents in the hostile territories down to the gadgets for congestion communication in traffic by general transportation when travelling for adequate provision of infrastructure during disaster recovery. As a lot of importance related to (mobile ad hoc network) MANET application, one important factor in ad-hoc networks is security. Using image processing for securing MANET is the area of focus of this research. Therefore, in this article, the security threats are assessed and representative proposals are summarized in ad-hoc network’s context. The study reviewed the current situation of the art for original to security provision called mobile ad hoc network for wireless networking. The threats to security are recognized while the present solution is observed. The study additionally summarized education erudite, talks on general issues and future instructions are recognized. Also, in this study, the forecast weighted clustering algorithm (FWCA) is employed as a cluster head over weighted clustering algorithm (WCA) is examined as quality in cluster-based routing, service is highly significant with MANET.
Volume: 18
Issue: 1
Page: 476-484
Publish at: 2020-02-01

Theoretical perspectives of the HCD integration in software development process

10.11591/ijeecs.v17.i2.pp1091-1095
Rogayah Abdul Majid , Nor Laila Md. Noor , Wan Adilah Wan Adnan
HCD is an approach that covers all of the human aspects including aesthetic and ergonomics, which will provide a better approach in strengthening the HCI approaches to strengthen the software development process. Lack of guidelines to guide the software practitioners to adopt the HCD in software development process become the main concern in this study. Among the problems that faced by the organizations that have adopted HCD, including problem of managing the resources such as human, financial and infrastructure. Therefore, this study used a theoretical lens to get a better understanding of HCD integration form management perspective, namely operational, tactical (management) and strategy perspective in software development process. Furthermore, the HCDP model is employed in this study because it covers the HCD activities from the project planning stage to the implementation stage of the software development process and it emphasizes on the larger scope of human factors and require broader skills in software development process. As a result, a conceptual model of HCD integration has been developed which emphasizes on the importance of managing the resources and long term strategic planning for the organization.  This is due to long term strategic planning and managing organization resources appropriately will contribute to the success of the organization which will increase organizational performance.
Volume: 17
Issue: 2
Page: 1091-1095
Publish at: 2020-02-01

Robust operation of microgrid energy system under uncertainties and demand response program

10.11591/ijeecs.v17.i2.pp1005-1013
Sahar Seyyedeh Barhagh , Amin Mohammadpour Shotorbani , Behnam Mohammadi-Ivatloo , Kazem Zare , Ali Farzamnia
Microgrid energy systems are one of suitable solutions to the available problems in power systems such as energy losses, and resiliency issues. Local generation by these energy systems can reduce the role of the upstream network, which is a challenge in risky conditions. Also, uncertain behavior of electricity consumers and generating units can make the optimization problems sophisticated. So, uncertainty modeling seems to be necessary. In this paper, in order to model the uncertainty of generation of photovoltaic systems, a scenario-based model is used, while the robust optimization method is used to study the uncertainty of load. Moreover, the stochastic scheduling is performed to model the uncertain nature of renewable generation units. Time-of–use rates of demand response program (DRP) is also utilized to improve the system economic performance in different operating conditions. Studied problem is modeled using a mixed-integer linear programming (MILP). The general algebraic modeling system (GAMS) package is used to solve the proposed problem. A sample microgrid is studied and the results with DRP and without DRP are compared. It is shown that same robustness is achieved with a lower increase in the operation cost using DRP.
Volume: 17
Issue: 2
Page: 1005-1013
Publish at: 2020-02-01

Optimization of image compression and ciphering based on EZW techniques

10.12928/telkomnika.v18i1.13092
Majid S.; Dijlah University College Naghmash , Nazar J.; Dijlah University College Alhyani , Ali M.; Dijlah University College Kadhim
This paper presents the design and optimization of image compression and ciphering depend on optimized embedded zero tree of wavelet (EZW) techniques. Nowadays, the compression and ciphering of image have become particularly important in a protected image storage and communication. The challenge is put in application for both compression and encryption where the parameters of images such as quality and size are critical in secure image transmission. A new technique for secure image storage and transmission is proposed in this work. The compression is achieved by remodel the EZW scheme combine with discrete cosine transform (DCT). Encrypted the XOR ten bits by initial threshold of EZW with random bits produced from linear-feedback shift register (LFSR). The obtained result shows that the suggested techniques provide acceptable compression ratio, reduced the computational time for both compression and encryption, immunity against the statistical and the frequency attacks.
Volume: 18
Issue: 1
Page: 511-518
Publish at: 2020-02-01

Performance analysis of multilayer multicast MANET CRN based on steiner minimal tree algorithm

10.12928/telkomnika.v18i1.13639
Basma Nazar; Mustansiriyah University Nadhim , Sarab Kamal; Mustansiriyah University Mahmood
In this study, the multicast mobile ad hoc (MANET) CRN has been developed, which involves multi-hop and multilayer consideration and Steiner minimal tree (SMT) algorithm is employed as the router protocol. To enhance the network performance with regards to throughput and packet delivery rate (PDR), as channel assignment scheme, the probability of success (POS) is employed that accounts for the channel availability and the time needed for transmission when selecting the best channel from the numerous available channels for data transmission from the source to all destinations nodes effectively. Within Rayleigh fading channels under various network parameters, a comparison is done for the performance of SMT multicast (MANET) CRN with POS scheme versus maximum data rate (MDR), maximum average spectrum availability (MASA) and random channel assignment schemes. Based on the simulation results, the SMT multicast (MANET) CRN with POS scheme was seen to demonstrate the best performance versus other schemes. Also the results proved that the throughput and PDR performance are improved as the number the primary channels and the channel’s bandwidth increased while dropped as the value of packet size D increased. The network’s performance grew with rise in the value of idle probability (P_I) since the primary user’s (PU) traffic load is low when the value of P_I is high.
Volume: 18
Issue: 1
Page: 37-50
Publish at: 2020-02-01
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