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29,922 Article Results

Design of a modified natural egyptian solar house

10.11591/ijece.v10i1.pp589-599
Hanaa M. Farghally , Faten H. Fahmy , Amal A. Hassan , Ninet M. Ahmed
The rate of increase in energy consumption and high costs in addition to the depletion of existing resources has a significant impact on our standard of living for next generations. In this case, the priority is to develop alternative cost-effective sources for powering the residential and non-residential buildings. This paper proposes and develops a design of a modified small two-story residential solar house for a medium-sized family located in Cairo, Egypt. This modified solar house meets almost all its energy demands including space heating by using solar air collector with a pebble storage unit in winter and a summer cooling system using wind catcher theory. Hot water is obtained throughout the day by using a steel sheltered water storage tank with a capacity of 1000 liter. Finally, the proposed heating system of the solar house is sized and modeled.
Volume: 10
Issue: 1
Page: 589-599
Publish at: 2020-02-01

Review on secured data capabilities of cryptography, steganography, and watermarking domain

10.11591/ijeecs.v17.i2.pp1053-1058
Farah Qasim Ahmed Al-Yousuf , Roshidi Din
Due to the increment of using Internet to transfer the critical and secret data, many studies interested in secured data and investigated many ways to secure the transferred information. This paper presents a review study on the field that used in a secured data domain. The main objective of this study is explore the capabilities of secured data that used widely by researchers. Furthermore, the benefits and the drawbacks for each of secured data domain are also studied. This paper concludes that cryptography techniques could be utilized with steganography and watermarking in secured data domain to enhance the security mechanisms.
Volume: 17
Issue: 2
Page: 1053-1058
Publish at: 2020-02-01

A low power wideband varactorless VCO using tunable active inductor

10.12928/telkomnika.v18i1.11365
Omar; Bangladesh Army University of Science and Technology (BAUST) Faruqe , Rumana; Military Institute of Science and Technology (MIST) Akhter , Md Tawfiq; Military Institute of Science and Technology (MIST) Amin
This paper presents a wideband varactorless voltage controlled oscillator (VCO) based on tunable active inductor in 90 nm CMOS process which yields a tuning range of 1.22 GHz to 3.7 GHz having a tuning scope of 100.5%. The designed VCO can be used for wideband wireless applications. The proposed VCO consumes a very low power (1.05 ~ 2.5) mW with the change of tuning voltages (0.3 ~ 0.9) V and provides a differential output power of (1.17 ~ -5.13) dBm. The VCO exhibits phase noise of -80.50 dBc/Hz@2.74 GHz and the Figure of Merit (FOM) is -147.73 dBc/Hz @2.74 GHz at 1MHz offset frequency. Achievement of high tuning range by altering the inductance of inductor which paves the way for eliminating the MOS varactor that recedes the overall silicon area consumption, is the noteworthy outcome of the proposed VCO. Furthermore, considering the dc power consumption, figure of merit (FOM) and consistency of performance parameters over tuning range, the proposed VCO outstrips the other referred VCOs.
Volume: 18
Issue: 1
Page: 264-271
Publish at: 2020-02-01

Complimentary split ring resonator sensor with high sensitivity based on material characterization

10.12928/telkomnika.v18i1.13255
Amer Abbood; University Politehnica of Bucharest Al-behadili , Teodor; University Politehnica of Bucharest Petrescu , Iulia; University Politehnica of Bucharest Andreea Mocanu
A new model of microwave planar sensor established on the complementary split ring resonator (CSRR) as well as an air hole in substrate of the structure is introduced for a precise measurement of materials permittivity. The hole is filled into substrate of the planar microstrip line. The CSRR structure with hole is selected for the sensitivity analysis, the result is established to hold over quite sensitive compared with CSRR structure without hole and thus evidence to be more suitable for the sensor design. The sensor in the form of CSRRs operating at a 1.74–3.4 GHz band is explained. At resonance, it is found that the electric field produced straight the plane of CSRR being highly sensitive for the characterization of sample resident with the sensor. The minimum transmission frequency of sensor shifts from 3.4 to 1.74 GHz as the sample permittivity varies from 1 to 10. A numerical model is introduced here for the computation of the system resolution as a function of resonance frequency and sample permittivity using electromagnetic simulator. It is found that the proposed sensor provides 35% increment in sensitivity more than conventional sensor for same permittivity of the sample under test.
Volume: 18
Issue: 1
Page: 272-281
Publish at: 2020-02-01

Graph-based algorithm for checking wrong indirect relationships in non-free choice

10.12928/telkomnika.v18i1.12982
Agung; Institut Teknologi Sepuluh Nopember Wiratmo , Kelly Rossa; Institut Teknologi Sepuluh Nopember Sungkono , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno
In this context, this paper proposes a combination of parameterised decision mining and relation sequences to detect wrong indirect relationship in the non-free choice. The existing decision mining without parameter can only detect the direction, but not the correctness. This paper aims to identify the direction and correctness with decision mining with parameter. This paper discovers a graph process model based on the event log. Then, it analyses the graph process model for obtaining decision points. Each decision point is processed by using parameterised decision mining, so that decision rules are formed. The derived decision rules are used as parameters of checking wrong indirect relationship in the non-free choice. The evaluation shows that the checking wrong indirect relationships in non-free choice with parameterised decision mining have 100% accuracy, whereas the existing decision mining has 90.7% accuracy.
Volume: 18
Issue: 1
Page: 106-113
Publish at: 2020-02-01

Vertebra osteoporosis detection based on bone density using Index-Singh statistical blended method

10.12928/telkomnika.v18i1.14462
Siswo; Universitas Sultan Ageng Tirtayasa Wardoyo , Teguh; Universitas Sultan Ageng Tirtayasa Firmansyah , Noviana; Universitas Sultan Ageng Tirtayasa Prima , Wiyono; Akademi Teknologi Warga Wiyono , Soenarto; Vocational Education Yogyakarta State University Soenarto , Djemari; Vocational Education Yogyakarta State University Mardapi
Osteoporosis is a progressive decrease in bone density so that the bones become brittle and broken. Bones are composed of minerals such as calcium and phosphate, so the bones become hard and solid. Many people do not realize that osteoporosis is a silent disease. Therefore, early detection of osteoporosis is very important. Detection of osteoporosis can be done by utilizing x-ray images of the vertebra. In this research the detection of bone density using blended statistical methods and Index-Singh. The x-ray sample used in this research was 50 images of osteoporosis patients. The result of the area calculation yields the highest white pixel is 7,983 pixels and the lowest white pixel is 5,410 pixels. Based on the results of these calculations, a statistical grouping is conducted into 6 Index-Singh. The range of statistical values is 5,410–6,266 pixels grouped into Index-Singh 1, range of data 6,323–6,512 pixels grouped into Index-Singh 2, the data range 6,520-6,747 pixels grouped into Index-Singh 3, data range 6,778-6,998 pixels grouped into Index-Singh 4, data range 7,001-7,219 pixels grouped into Index-Singh 5, and data range 7,338-7,983 pixels grouped into Index-Singh 6. Overall, the results of testing the osteoporosis detection system have been successful and can be used as an early detection system for osteoporosis. This assistance system has a detection accuracy of 76% compared to doctor's justification.
Volume: 18
Issue: 1
Page: 148-155
Publish at: 2020-02-01

Analysis review on linguistic steganalysis

10.11591/ijeecs.v17.i2.pp950-956
Syiham Mohd Lokman , Aida Mustapha , Azizan Ismail , Roshidi Din
Steganography and steganalysis are essential topics for hiding information. Steganography is a technique of conceal secret messages by transmitting data through different domains. Its objective is to avoid discovery of secret messages. Steganalysis, meanwhile, is a method for locating the secret messages contained in the stego text. The objective of steganalysis is to find concealed data and to break the security of its domains. Steganalysis can be categorized into two types: targeted steganalysis and blind steganalysis. Steganography and steganalysis both have domains that are split into natural, also known as linguistic and digital media. There are three kinds of digital media which are picture, video and audio. The aim of this paper is to provide a survey on different linguistic steganalysis techniques used to find secret messages. This paper also highlighted two type of steganalysis method that are used in research and real practice. The discussion include findings on the most recent work on linguistic steganalysis techniques. This review hoped to help future research for improving and enhancing steganalytic capabilities.
Volume: 17
Issue: 2
Page: 950-956
Publish at: 2020-02-01

A mitigation of channel crosstalk effect in dispersion shifted fiber based on durability of modulation technique

10.11591/ijece.v10i1.pp891-899
Ali Shaban , Murad Obaid Abed , Ehab Abdul Razzaq Hussein , H. J. Abd
In fiber optics the Four Wave Mixing (FWM) has the harmful effect of an optical transmission system that can severely limit Wavelength Division Multiplexing (WDM) and reduce the transmission aptness. This work preset the durability of the different modulation format was tested to FWM by using Dispersion Shifted Fiber (DSF). Moreover, the performance of the proposed system is surveyed by changing the fiber length and applying an information rate of 200 Gb/s. The experimental results show that the FWM capacity has decreased significantly by more than 14 dB when applying Return to Zero (RZ) modulation form. In addition, in terms of the propsed system performance in the first channel and with 700 km distance, it was observed that the lower Bit Error Rate (BER) in the normal RZ modulation is equal to 1.3×10-13. As well as it is noticeable when applied the Non Return to Zero (NRZ), the Modified Duobinary Return to Zero (MDRZ) and Gaussian modulation, the system performance will be quickly changed and getting worse, where the BERs increased to 1.3×10-4, 1.3×10-6 and 1.3×10-2 consecutively at same channel and for the same parameters.
Volume: 10
Issue: 1
Page: 891-899
Publish at: 2020-02-01

A low cost fractal CPW fed antenna for UWB applications with a circular radiating patch

10.12928/telkomnika.v18i1.12666
Akram El; Hassan 1st University of Settat Hamdouni , Abdelali; Hassan 1st University of Settat Tajmouati , Jamal; Hassan 1st University of Settat Zbitou , Hamid; Moulay Ismail University Bennis , Ahmed; Hassan 1st University of Settat Errkik , Larbi; Hassan 1st University of Settat El Abdellaoui , Mohamed; Microwave group, ESEO Angers Latrach
In this study a validated antenna into simulation and through measurement has been described and analyzed. The coplanar waveguide (CPW) technique has been chosen to feed the radiating patch while the two ground planes have been partially designed in the top side of the substrate. The fractal geometry, applied to the circular radiator, has been obtained by merging the circular and rectangular shapes. The fiberglass FR-4, with a single side of 35μm copper thickness, has been used to achieve the antenna material with a permittivity of 4.4, a thickness of 1.6 mm, a loss tangent of 0.025 and an overall dimension of 34x43 mm2. The proposed CPW fractal antenna has been configured to operate in the frequency range 3.1-10.6 GHz published by the federal communications commission (FCC) as an ultra-wide band (UWB). To calculate the return loss, the gain, the current density and the radiation pattern of the simulated antenna, two electromagnetic solvers have been involved which are the CST microwave studio and ADS. The series of measurement have been performed by using the network analyzer and the anechoic chamber in order to confirm the computed antenna.
Volume: 18
Issue: 1
Page: 436-440
Publish at: 2020-02-01

In-sole plantar pressure device with optimization measurement techniques

10.11591/ijeecs.v17.i2.pp739-749
O. Hussein , W.Z. Wan Hasan , A. Che Soh , H. Jafaar , H.R. Ramli , S.P. Ang , Zainidi Haji Abdul Hamid
Doctors and clinicians rely on accurate underfoot pressure data to perform diagnosis of foot diseases. In sole pressure measurement systems are designed to provide such data but its implementation suffers from certain constraints such as the need for a spacer to be placed on the sensor when taking measurements and the need for multiple calibrations due to the fact that the sensor parameters tend to change without it. In this work, we proposed an optimization technique to address these limitations. The results obtained from testing indicate that the proposed device performed measurement of plantar pressure effectively. Also, the calculation of body weight using the proposed optimization technique is improved from 5.07% to 9.06%. For validation, the results are compared with the measurements from a commercial plantar pressure device (EMED system) as benchmark. 
Volume: 17
Issue: 2
Page: 739-749
Publish at: 2020-02-01

Design and development broadband monopole antenna for in-door application

10.12928/telkomnika.v18i1.13171
Ali Abdulateef; Universiti Teknologi Malaysia (UTM) Abdulbari , Z.; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , Sharul Kamal; Universiti Teknologi Malaysia (UTM) Abdul Rahim , Yaqthan Mahmood; Universiti Teknologi Malaysia (UTM) Hussein , Mustafa Mohammed; Universiti Teknologi Malaysia (UTM) Jawad , Ayad Muslim; Universiti Teknologi Malaysia (UTM) Hamzah
This paper describes the broadband monopole antenna refers to a signal wideband of the frequencies, which can be divided the signal into channels of the frequency bins.  Aim this paper to design and development broadband monopole antenna. The monopole antenna was designed by adding slot to the radiated patch antenna with a single feed line, which reduced the size and the design complexity. A rectangular patch antenna was presented using feed line to decrease the ground plane with a suitable gap distance. The broadband monopole antenna was designed with a frequency range of 800 MHz–3 GHz, with Bandwidth 0.66(dB), reflection coefficients and return loss. The frequency-dependent characteristic impedance was included. It can be used in various broadband applications in used commercially for various communication systems such as 4G (LTE), WiMAX and WLAN (LTE), remote sensing, biomedical, and mobile wireless. Apart from that, this technology is environment-friendly; an antenna which consists of reception and transmission. The antenna is simulated by using computer simulation (CST) software; a low cost of 4.4 permittivity FR-4 substrate is used. The measurement result is accepted with simulation result, proving the acceptable broadband operation for this proposed structure.
Volume: 18
Issue: 1
Page: 51-56
Publish at: 2020-02-01

Examination on the physical properties of untreated kenaf insulation paper at different beating degrees

10.11591/ijeecs.v17.i2.pp759-766
Muhammad Umair , Norhafiz Azis , Rasmina Halis , Jasronita Jasni
This paper examines the physico-mechanical properties of untreated kenaf based insulation paper with consideration on different beating degrees. Kenaf bast fibers were first processed through soda pulping process. Different beating degrees were subjected to the processed pulps. Physical parameters of the paper were measured for each of the beating degrees. It is found that as the beating revolution increases, the kenaf based insulation paper’s density, tensile index and burst index increase while thickness and tear index decrease. 
Volume: 17
Issue: 2
Page: 759-766
Publish at: 2020-02-01

A comparative study of three validities computation methods for multimodel approach

10.11591/ijece.v10i1.pp881-890
Samia Talmoudi Ben Aoun , Abdennacer Ben Messaoud , Moufida Lahmari Ksouri
The multimodel approach offers a very satisfactory results in modelling, diagnose and control of complex systems. In the modelling case, this approach passes by three steps: the determination of the model’s library, the validities computation and the establishment of the final model. In this context, this paper focuses on the elaboration of a comparative study between three recent methods of validities computation. Thus, it highlight the method that offers the best performances in term of precision. To achieve this goal, we apply, these three methods on two simulation examples in order to compare their performances.
Volume: 10
Issue: 1
Page: 881-890
Publish at: 2020-02-01

PWM control techniques for three phase three level inverter drives

10.12928/telkomnika.v18i1.12440
Arkan A.; University of Kufa Kadum
In this paper two very efficient pulse width modulation techniques were discussed named Sin pulse width modulation and space vector pulse width modulation. The basic structure of the three-level inverter neutral-point clamped is introduced and the basic idea about space vector pulse width modulation for three-level voltage source inverter has been discussed in detail. Nearest three vectors space vector pulse width modulation control algorithm is adopted as the control strategy for the three phase three level NPC inverter in order to compensate the neutral-point shifting. Mathematical formulation for calculating switching sequence has determined. Comparative analysis proving superiority of the space vector pulse width modulation technique over the conventional pulse width modulation, and the results of the simulations of inverter confirm the feasibility and advantage of the space vector pulse width modulation strategy over sin pulse width modulation in terms of good utilization of dc-bus voltage, low current ripple and reduced switching frequency. Space vector pulse width modulation provides advantages better fundamental output voltage and useful in improving harmonic performance and reducing total harmonic distortion.
Volume: 18
Issue: 1
Page: 519-529
Publish at: 2020-02-01

Iris images encryption based on QR code and chaotic map

10.12928/telkomnika.v18i1.13293
Raniah Ali; Mustansiriyah University Mustafa , Amal Abdulbaqi; Mustansiriyah University Maryoosh , Dena Nadir; Mustansiriyah University George , Waleed Rasheed; Mustansiriyah University Humood
In this paper an Iris image is encrypted based on QR (quick response) code and chaotic map. The main idea of the proposed system is generating a QR code depending on the input text and then extract the features from QR code by using convolution, these features are used for key generation. After that the permuted iris image is encrypted by using generated key, after that the resulting image will be encrypts using 2D logistic map. The randomness of generated key is tested using the measures of NIST, and quality of images that encrypted in this method are tested by using security analysis tests such as PSNR, UACI, NPCR, histogram, correlation and entropy. The security analysis shows that the proposed system is secure for iris image encryption.
Volume: 18
Issue: 1
Page: 289-300
Publish at: 2020-02-01
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