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29,734 Article Results

Cooperative and fresher encounter algorithm for reducing delay in MANET

10.11591/ijeecs.v14.i3.pp1258-1265
Noor Alleema , D. Siva Kumar
In Mobile Ad-hoc Networks (MANET), the route discovery is the chief problem for the nodes. In this paper Cooperative and Fresher Encounter Algorithm (CFEA) for Reducing Delay in MANET is proposed. The route discovery problem has been overcome by FResher Encounter algorithm. It is a simple algorithm for discovery the routes in efficient manner in the MANET. The node has the memory of past route details that communicate with remaining nodes. The node prefers to find the intermediate node instead of finding the destination node, that intermediate node keeps the knowledge of recently encounter the destination node. Then the intermediate node communicates with the node which is encountered the destination node recently, and the process is continued until the destination is attained. The main advantage of the scheme is reducing the process time.
Volume: 14
Issue: 3
Page: 1258-1265
Publish at: 2019-06-01

Automated medical surgical trolley

10.11591/ijece.v9i3.pp1822-1831
N. M. Saad , A. R. Abdullah , N. S. M. Noor , N. A. Hamid , M. A. Muhammad Syahmi , N. M. Ali
Operating theatre is a place in a hospital where surgical operations are conducted on patients by surgeons. In the operating theatre, the surgical equipment is placed on stainless steel table or on surgical instrument tray. However, during the operation accidents can occur where the surgical tools placed near to the surgeon could be accidentally be hit by them during the surgical operation. This may cause the surgical tools to fall on the floor which may lead to injuries. Hence, this paper presents an automatic medical surgical trolley for surgeons to grab operating tools easily. The proposed system is implemented for automaticmedical surgical trolley movement using Arduino Uno R3. The invention provides an automatic medical surgical trolley which comprises automatic guidance, a wireless controller, an obstacle avoiding detection device, a touch screen controller via smart phone, an IP camera, a trolley, an integrated power supply and a processor. The trolley with stainless steel shelves is ideal for use in clinical environments and operation theatres. Medical equipment is loaded in the trolley, the wireless remote drives the trolley to move forwards and backwards. Automatic visual guidance is achieved via an IP camera attached to the trolley and a touch screen controller via a smart phone. A large amount of space and a large number of materials are saved, the workload of medical workers will be greatly relieved, and the working efficiency will be improved.
Volume: 9
Issue: 3
Page: 1822-1831
Publish at: 2019-06-01

Analysis of the hard and soft shading impact on photovoltaic module performance using solar module tester

10.11591/ijpeds.v10.i2.pp1014-1021
Mustafa Hamid Al-Jumaili , Ahmed Subhi Abdalkafor , Mohammed Qasim Taha
Solar cells are a major alternate source of sustainable energy in the usual condition of depleting non- renewable energy sources. Nowadays, this source is getting more and more important due to its use in large and small-scale installations. One of the major causes of energy losses in photovoltaic (PV) modules is the shading. It can happen due to clouds passing, near trees, and/or neighboring structures. Generally, there are two types of PV module Shading which are either partial shading or complete shading. Both have a significant impact on the solar module output power. This paper is an attempt of carrying out a study of the electrical characteristics of a solar module with various percentages of simulated shading. The solar module tester (SMT) simulator was used in this study. The study approved the direct correlation between short-circuit current and solar irradiance. The advantage of using SMT is its stable irradiance in comparison to the practical unstable solar irradiance within the same period. The results of both methods of shading simulation show that shading has a significant impact on the performance of solar panel in terms of efficiency, fill factor and output power. For better performance, solar panels should install in shading free places as much as its possible.
Volume: 10
Issue: 2
Page: 1014-1021
Publish at: 2019-06-01

Simple control scheme buck-boost DC-DC converter for stand alone PV application system

10.11591/ijpeds.v10.i2.pp1090-1101
M. Z. Zulkifli , M. Azri , A. Alias , Md. H. N. Talib , J. M. Lazi
In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.
Volume: 10
Issue: 2
Page: 1090-1101
Publish at: 2019-06-01

Estimate model of system management for database security

10.11591/ijeecs.v14.i3.pp1391-1394
W. Ch Alisawi , Alaa Abdul AlMuhsen Hussain , Wasan A. Alawsi
A generalized model of information protection of a database management system is proposed, which can be used to implement database protection under any database management system. This model development methodology consists of four stages: requirements gathering, database analysis, “multi-level relational logical construction and a specific logical construction. The first three steps define actions for analyzing and developing a secure database, thus creating a generalized and secure database model”.
Volume: 14
Issue: 3
Page: 1391-1394
Publish at: 2019-06-01

Novel steganography scheme using Arabic text features in Holy Quran

10.11591/ijece.v9i3.pp1910-1918
Huda Kadhim Tayyeh , Mohammed Salih Mahdi , Ahmed Sabah Ahmed AL-Jumaili
With the rapid growth of the Internet and mobile devices, the need for hidden communications has significantly increased. Steganography is a technique introduced for establishing hidden communication, Most steganography techniques have been applied to audio, images, videos, and text. Many researchers used steganography in Arabic texts to take advantage of adding, editing or changing letters or diacritics, but lead to notable and suspicious text. In this paper, we propose two novel steganography algorithms for Arabic text using the Holy Quran as cover text. The fact that it is forbidden to add, edit or change any letter or diacritics in the Holy Quran provides the valuable feature of its robustness and difficulty as a cover in steganography. The algorithms hide secret messages elements within Arabic letters benefiting from the existence of sun letters (Arabic: ḥurūf shamsīyah) and moon letters (ḥurūf qamarīyah). Also, we consider the existence of some Arabic language characteristics represented as small vowel letters (Arabic Diacritics). Our experiments using the proposed two algorithms demonstrate high capacity for text files. The proposed algorithms are robust against attack since the changes in the cover text are imperceptible, so our contribution offers a more secure algorithm that provides good capacity.
Volume: 9
Issue: 3
Page: 1910-1918
Publish at: 2019-06-01

Hardware implementation of single phase three-level cascaded h-bridge multilevel inverter using sinusoidal pulse width modulation

10.11591/ijpeds.v10.i2.pp625-635
A. Shamsul Rahimi A. Subki , Mohd Zaidi Mohd Tumari , Wan Norhisyam Abd Rashid , Aiman Zakwan Jidin , Ahmad Nizammuddin Muhammad Mustafa
In this paper a hardware implementation of single-phase cascaded H-bridge three level multilevel inverter (MLI) using sinusoidal pulse width modulation (SPWM) is presented. There are a few interesting features of using this configuration, where less component count, less switching losses, and improved output voltage/current waveform. The output of power inverter consists of three form, that is, square wave, modified square wave and pure sine wave. The pure sine wave and modified square wave are more expensive than square wave. The focus paper is to generate a PWM signal which control the switching of MOSFET power semiconductor. The sine wave can be created by using the concept of Schmitt-Trigger oscillator and low-pass filter topology followed by half of the waveform will be eliminated by using the circuit of precision half-wave rectifier. Waveform was inverted with 180º by circuit of inverting op-amp amplifier in order to compare saw-tooth waveform. Two of PWM signal were produced by circuit of PWM and used digital inverter to invert the two PWM signal before this PWM signal will be passed to 2 MOSFET driver and a 3-level output waveform with 45 Hz was produced. As a conclusion, a 3-level output waveform is produced with output voltage and current recorded at 22.5 Vrms and 4.5 Arms. The value of measured resistance is 0.015 Ω that cause voltage drop around 0.043 V. Based on the result obtained, the power for designed inverter is around 100W and efficiency recorded at 75%.
Volume: 10
Issue: 2
Page: 625-635
Publish at: 2019-06-01

Opinion mining on newspaper headlines using SVM and NLP

10.11591/ijece.v9i3.pp2152-2163
Chaudhary Jashubhai Rameshbhai , Joy Paulose
Opinion Mining also known as Sentiment Analysis, is a technique or procedure which uses Natural Language processing (NLP) to classify the outcome from text. There are various NLP tools available which are used for processing text data. Multiple research have been done in opinion mining for online blogs, Twitter, Facebook etc. This paper proposes a new opinion mining technique using Support Vector Machine (SVM) and NLP tools on newspaper headlines. Relative words are generated using Stanford CoreNLP, which is passed to SVM using count vectorizer. On comparing three models using confusion matrix, results indicate that Tf-idf and Linear SVM provides better accuracy for smaller dataset. While for larger dataset, SGD and linear SVM model outperform other models.
Volume: 9
Issue: 3
Page: 2152-2163
Publish at: 2019-06-01

An improved model of hybrid multi converter used for grid connected applications

10.11591/ijpeds.v10.i2.pp860-867
E. Catherine Amala Priya , G. T. Sundar Rajan
A Hybrid multi converter topology is proposed in this paper, which supplies simultaneous voltage’s for various levels from Renewable energy source. The proposed topology is realized by replacing Multi cuk- buck converter topology. The resultant hybrid multi converter requires less number of switches to operate, as well as various output voltages of different levels without interruption with increased stability. This type of hybrid multi converter with high reliability and high stability are well implemented for loads utilizing various levels of DC voltage. Converter, proposed in this paper is called Hybrid Multi converter topology (HMCT). A study is made on the steady state of the HMCT and a comparative study has been made with the conventional designs. A PI controller based feedback controller is designed to stabilize the various output voltages. A simulated model for the proposed HMCT is used to simulate various output voltages of dissimilar values from mono DC- input. The performance of the converter is demonstrated using simulation model. The proposed design can be protracted to voltage source inverter, multilevel inverter to produce AC output.
Volume: 10
Issue: 2
Page: 860-867
Publish at: 2019-06-01

CMOS ring oscillator delay cell performance: a comparative study

10.11591/ijece.v9i3.pp1757-1764
D. A. Hadi , A. Z. Jidin , N. Ab Wahab , Madiha Z. , Nurliyana Abd Mutalib , Siti Halma Johari , Suziana Ahmad , M. Nuzaimah
A common voltage-controlled oscillator (VCO) architecture used in the phase locked loop (PLL) is the ring oscillator (RO). RO consist of number of inverters cascaded together as the input of the first stage connected to the output of the last stage. It is important to design the RO to be work at desired frequency depend on application with low power consumption. This paper presents a review the performance evaluation of different delay cell topologies the implemented in the ring oscillator. The various topologies analyzed includes current starved delay cell, differential delay cell and current follower cell. Performance evaluation includes frequency range, frequency stability, phase noise and power consumption had been reviewed and comparison of different topologies has been discussed. It is observed that starved current delay cell have lower power consumption and the different of the frequency range is small as compared to other type of delay cell.
Volume: 9
Issue: 3
Page: 1757-1764
Publish at: 2019-06-01

Frequency regulation of modern power system using novel hybrid DE-DA algorithm

10.11591/ijaas.v8.i2.pp103-116
Sayantan Sinha , Ranjan Kumar Mallick
An attempt has been made to regulate the frequency of an interconnected  modern power system using automatic generation control under a restructured market scenario. The system model considered consists of a thermal generation plant coupled with a gas turbine plant in both areas. The presence of deregulated market scenario in an interconnected power system makes it too vulnerable to small load disturbance giving rise to frequency and tie line power imbalances. An attempt has been made to introduce a novel Tilted Integral derivative controller to minimize the frequency and tie line power deviations and restrict them to scheduled values. A maiden attempt has been made to tune the controller gains with the help of a novel hybrid optimization scheme which includes the amalgamation of the exploitative nature of the Differential evolution technique and the explorative attributes of the Dragonfly Algorithm. This hybrid technique is therefore coined as Differential evolution- dragonfly algorithm (DE-DA) technique. Use of some standard benchmark fucntions are made to prove the efficacy of the proposed scheme in tunig the controller gains. The supremacy of the proposed TID controller is examined under two individual market scenarios and under the effect of a step load disturbance. The robustness of the controller in minimizing frequency deviations in the systems is broadly showcased. The superiority of the controller is also proved by comparing it with pre published results.
Volume: 8
Issue: 2
Page: 103-116
Publish at: 2019-06-01

An approximation delay between consecutive requests for congestion control in unicast CoAP-based group communication

10.11591/ijece.v9i3.pp1997-2005
Chanwit Suwannapong , Chatchai Khunboa
This research presents a way to avoid network congestion during unicast CoAP-based group communication using increased delays between consecutive requests (DCR) in LoWPAN border routers to limit request send rates. It also provides a way to determine DCR values that are suitable for various network group sizes with differing node counts. The optimal DCR is obtained using the least squares approximation method and the relative minimum. Results from experimentation shows a positive relation, that is, an increase in group size necessitates an increase in DCR value. Experiments in various group sizes show favorable network performance and support the proposed congestion control method using DCR.
Volume: 9
Issue: 3
Page: 1997-2005
Publish at: 2019-06-01

Capacitive power transfer in biomedical implantable device: a review

10.11591/ijpeds.v10.i2.pp935-942
Muhammad Zaki bin Mustapa , Shakir Saat , Yusmarnita Yusof , Muslimah Meor Shaari
This paper presents the development of a new design method of capacitive power transfer (CPT) which is based on hybrid concept for Biomedical Implants. This method is able to improve various issues found in the widely used CPT system that is bipolar CPT method. Based on the ability of this purposed, the simulation of the CPT system has been designed to prove an amount of power transferred through a layer of tissue. The design used to validate the suggested model which to powering implanted device, and it was performed with 3cm square plates, which have a layer of beef with the 5mm thickness in between 2 coupling plate. Power signal was generated by Class E zero voltage switching. The Class E zero voltage switching has been designed to generating alternate current with the 1MHz frequency appropriate to the hybrid CPT system specification.
Volume: 10
Issue: 2
Page: 935-942
Publish at: 2019-06-01

Matlab/simulink simulation of unified power quality conditioner-battery energy storage system supplied by PV-wind hybrid using fuzzy logic controller

10.11591/ijece.v9i3.pp1479-1495
Amirullah Amirullah , Ontoseno Penangsang , Adi Soeprijanto
This paper presents performance analysis of Unified Power Quality Conditioner-Battery Energy Storage (UPQC-BES) system supplied by Photovoltaic (PV)-Wind Hybrid connected to three phase three wire (3P3W) of 380 volt (L-L) and 50 hertz distribution system. The performance of supply system is compared with two renewable energy (RE) sources i.e. PV and Wind, respectively. Fuzzy Logic Controller (FLC) is implemented to maintain DC voltage across the capacitor under disturbance scenarios of source and load as well as to compare the results with Proportional Intergral (PI) controller. There are six scenarios of disturbance i.e. (1) non-linear load (NL), (2) unbalance and nonlinear load (Unba-NL), (3) distortion supply and non-linear load (Dis-NL), (4) sag and non-linear load (Sag-NL), (5) swell and non-linear load (Swell-NL), and (6) interruption and non-linear load (Inter-NL). In disturbance scenario 1 to 5, implementation of FLC on UPQC-BES system supplied by three RE sources is able to obtain average THD of load voltage/source current slightly better than PI. Furthermore under scenario 6, FLC applied on UPQC-BES system supplied by three RE sources gives significantly better result of average THD of load voltage/source current than PI. This research is simulated using Matlab/Simulink.
Volume: 9
Issue: 3
Page: 1479-1495
Publish at: 2019-06-01

Experiment study investigation compare temperature series circuit and the parallel circuit of thermoelectric and variable water, electrical of thermoelectric for heat exchanger

10.11591/ijpeds.v10.i2.pp785-791
Akawit Yaidee , Chantana Punlek , Somchai Maneewan
This paper presents the comparison temperature of thermoelectric (Tec1-12708) between the series circuit and parallel circuit by adjusting of water flow rate pump and electrical supplying to thermoelectric, The electrical voltage at 8,10 and 12 V, water flow rate in reservoir was 0.015 kg/s and 0.025 kg/s. Experiments perform were 6 hours. The result from the researches, thermoelectric with parallel circuit high temperature more than thermoelectric with series circuit. The parallel circuit of thermoelectric can work better than the series circuit in hot side. The different temperature hot side of parallel circuit with the electrical voltage at 8, 10 and 12 V water flow rate in reservoir was 0.015 kg/s temperature average is 22.44 oC, 22.90 oC, 29.86 oC, and water flow rate in reservoir was 0.025 kg/s temperature average is 20.67 oC, 26.66 oC, 27.69 oC. Thermoelectric with parallel circuit makes the higher temperature more than thermoelectric with series circuit about 33%, 37%, 44% water flow rate in reservoir was 0.015 kg/s and 30%, 40%, 41% water flow rate in reservoir was 0.025 kg/s.
Volume: 10
Issue: 2
Page: 785-791
Publish at: 2019-06-01
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