Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

31,456 Article Results

KED-AES algorithm: combined key encryption decryption and advance encryption standard algorithm

10.11591/ijaas.v8.i1.pp44-53
Edwin Romeroso Arboleda , Carla Eunice R. Fenomeno , Joshua Z. Jimenez
Two existing cryptosystems are being combined and proposed. It is the enhanced combination of KED (Key Encryption Decryption), a cryptosystem that uses modulo 69 and the AES (Advance Encryption Standard) cryptography. The strength of the KED is that the keys are being used by the sender and the receiving end. The AES is easy to implement and has good defense against various attacks such as hacking.
Volume: 8
Issue: 1
Page: 44-53
Publish at: 2019-03-01

A categorical data analysis of impact of biogas on women of rural households – with examples from Nepal

10.11591/ijaas.v8.i1.pp34-43
Jyoti U. Devkota
This paper is based on primary data collected from 400 households of biogas consumers. A detailed structured questionnaire was developed and pretested. Here response to each question was given as a multiple choice option resulting in more than 450 categorical data. These variables studied various aspects of households using biogas. The results focused on women of these households. Interrelationships between several other variables including the role of a woman in various decisions related to the plant were analyzed. Logistic regression of decision making of woman on several variables including asset index of the family was done. This asset index was calculated from the principle component analysis of socio-economic variables. The family dynamics in the choice of biogas as renewable energy source was quantified using odds ratio and regression coefficients. The interdependence between variables was tested using Chi square test of Independence of Attributes. A novel data based approach of generation and analysis of categorical data is demonstrated here. The suitability of generation of categorical data in the absence of accurate measurement instruments is highlighted. This method is also suitable for countries without a strong backbone of good quality official records, and provides a good backup data for official statistics.
Volume: 8
Issue: 1
Page: 34-43
Publish at: 2019-03-01

Comparative study of the most efficient maximum power point tracking techniques for a photovoltaic system

10.11591/ijaas.v8.i1.pp73-82
I. M. Abdel-Qawee , H. G. Hamed , Maged N. F. Nashed , Ayman Y. Yousef , Khaled M. Hasaneen
In Photovoltaic (PV) systems, maximum power point tracking (MPPT) is an important challenge which faces this system. In this paper, a comparative study between two high efficient MPPT control techniques is presented. These techniques are based on the incremental conductance (IC) method. The first technique is based on optimized PI-controller gains and the other is based on Fuzzy Logic Control (FLC). The comparison between the algorithms is investigated under different environmental conditions. The comparison criteria which are taken into consideration are: the percentage tracking factor (%TF), the tracking time, the ripple voltage in the steady-state, the dynamic response, and the complexity of implementation.
Volume: 8
Issue: 1
Page: 73-82
Publish at: 2019-03-01

Performance analysis of DC/DC bidirectional converter with sliding mode and pi controller

10.11591/ijpeds.v10.i1.pp357-365
Chandra Shekher Purohit , Geetha M. , Padmanaban Sanjeevikumar , Pandav Kiran Maroti , Shruti Swami , Vigna K. Ramachandaramurthy
A sliding mode controller for a non-isolated DC/DC, bidirectional converter is presented and comparative study with PI controller is done along with ISE analysis, in order to do performance analysis. The proposed system can be utilized in many applications such as electrical vehicle, distributed power generation or small grids. Second theorem of Lyapunov is utilized and stability of the closed loop system is mathematically proven. The adopted control strategy achieves effective output voltage regulation and good dynamic stability. Rejection of disturbance is also an inherent characteristic of this technique. Furthermore, it is illustrated that the system can successfully follow changes of load demand and compensates sudden disturbances in operating condition. The design is evaluated and verified using Matlab/Simulink. Results of Matlab simulation are provided to show the feasibility of the proposed system and effectiveness of control method. Simulation results show that this technique can provide a considerable edge over control techniques which are presently available (applied) over this type of converter.
Volume: 10
Issue: 1
Page: 357-365
Publish at: 2019-03-01

The influence of problem based learning towards social science learning outcomes viewed from learning interest

10.11591/ijere.v8i1.15594
Berti Dyah Permatasari , Gunarhadi Gunarhadi , Riyadi Riyadi
The aim of this study is to determine the influences of Problem Based Learning and learning interest at improving the cognitive learning outcomes in social science of fourth-grade elementary school students. This study is a quasi-experiment study with pre-test and post-test control group design. The sample collection is taken with stratified cluster random sampling technique. The sample of this study is 109 fourth-grade elementary school students, consisted of 50 students from experiment group and 59 students from control group. The students from experiment group are given the application of Problem Based Learning, while the students in control group are given the application of Direct Instruction. The data collection is carried by using the instruments of social science learning outcomes test and social science learning interest questionnaire. The validity of test and questionnaire instruments is carried by expert judgement. The difficulty level, distinguishing power, and reliability of test instrument is tested by using ITEMAN application. The internal consistency and reliability of questionnaire instrument is tested by using SPSS application. The data is analysed by using two-way anova. The outcomes of the study show that PBL and learning interest contribute significant impact towards social science learning outcomes of elementary school students.
Volume: 8
Issue: 1
Page: 39-46
Publish at: 2019-03-01

Implementation of quasi-z source inverter for grid connected PV based charging station of electric vehicle

10.11591/ijpeds.v10.i1.pp366-373
D Sattianadan , K Saravanan , S. Murugan , N. Hari , P. Venkadesh
In recent trends, the use of electric vehicles is taking a sudden hike as they seem to be a much more friendly for the environment as compared to the conventional vehicles that run on combustion engines for a mode of transportation. With the increasing popularity of electric vehicles, the demand on the utility grid is also increasing. To overcome this problem, other alternative sources of energy need to be considered. Photovoltaic energy as the solution is finding its place in the EV charging systems. However, the total amount of energy that can be generated from the PV system is constrained, based on many parameters such as solar radiation, availability of space for Solar power plant development, maintenance of the system, etc. Hence, to maintain the continuity of the system, it needs to be integrated with the grid as well. This offers a smooth charging operation for the electric vehicles. In this paper, a new method is introduced for the integration between the solar inverter system and the utility transmission grid. Quasi-Z-source topology is proposed for the system integration. This topology facilitates a bidirectional flow of power between the PV source, the storage unit and the utility grid. The greatest advantage of this topology is its flexibility with different voltage levels of the solar inverter DC connection and the storage battery which requires no circuit alteration for charging batteries of different ratings. The hardware for the system is also fabricated. The results demonstrate that the proposed topology fits the generalized requirements.
Volume: 10
Issue: 1
Page: 366-373
Publish at: 2019-03-01

Embedded patient monitoring system

10.11591/ijpeds.v10.i1.pp388-397
Jayanna Kanchikere , A.K. Ghosh , Kalyankumar Kalyankumar
ICU remains for Intensive Care Unit, a place in the recuperating office where wiped out patients are checked eagerly. Commonly, the patient-staff extent is low and the LIFE-SAVING EQUIPMENT used is outstandingly bleeding edge Generally ICU is a healing facility for course of action of genuine nursing and remedial consideration of essentially wiped out patients, depicted by high bore and measure of unending nursing and restorative supervision and by use of cutting edge checking and resuscitative equipment The patients in the ICU require a predictable seeing of their Temperature and pulse circulatory strain. This undertaking is a working model, which wires sensors to evaluate imperative parameters specifically the Temperature, Respiratory temperature and Heart Beat. The sensors are interfaced to PC, with the objective that the condition of a patient can be explored by masters in any bit of the center wherever they are. At whatever point there is a variety from the standard felt by the patient, the particular patient will give an alert movement, by which the pro can race to the patient. Despite when the patient is in a careless condition, each one of the parameters will be identified and pro will be admonished, thusly it diminishes master's remaining task at hand and besides gives more correct results .Our endeavor is a working model which wires sensors to measure each one of these parameters like body temperature, Respiratory Temp and Heart Beat rate and trade it to the PC, with the objective that the patient condition can be examined to by authorities in any bit of the recuperating focus wherever they are. In this way it decreases experts work stack and besides gives more exact results, wherever there is a variety from the standard felt by the patient, we have in like manner combined saline watching system which gives an alert when the saline container going to cleanse.
Volume: 10
Issue: 1
Page: 388-397
Publish at: 2019-03-01

Views towards the revolution history course of foreign students in Turkey

10.11591/ijere.v8i1.14965
Zafer Tangülü , Beytullah Kaya
Studying history in accordance with gaining the legitimacy of the official ideology and reaching the historical bases that will open the way for the national identity for all teaching stages starting from primary education to tertiary education has made the national history subjects and naturally the topics of the Principles of Atatürk and History of the Turkish Revolution course both important and valuable. Although the teaching of Principles of Atatürk and History of the Turkish Revolution course has a role in the realization of national goals in higher education, the universal messages the program contains clearly demonstrate that the course has also a universal role beside the national identity of it. The purpose of this study is to investigate the opinions of foreign students studying in Turkey towards Principles of Atatürk and History of the Turkish Revolution course. To this end, this research is a case study in the qualitative research design. 12 foreign students studying at Istanbul Sebahattin Zaim University participated the study. The participants of the study were selected by purposive sampling method among criterion sampling methods. The criterion to pick these students was that they were accepted on the condition that they did Principles of Atatürk and History of the Turkish Revolution course for at least one semester at university. 6 female and 6 male students participated the study. Semi-structured interview form with 5 questions was prepared in order to determine the opinions of students participating in the research and content analysis was utilized to analyze the data obtained from the research and discourse analysis methods were employed to present the data. The opinions of the participants were transcribed and similar responses were categorized under certain headings. Research findings show that students are of the opinion that the course is very necessary for them and that it helps them to get scholar knowledge on Turkish history and it also helps them to get accurate history knowledge.
Volume: 8
Issue: 1
Page: 9-19
Publish at: 2019-03-01

Parameter estimation of DC motor through whale optimization algorithm

10.11591/ijpeds.v10.i1.pp83-92
Byamakesh Nayak , Sangeeta Sahu
This article estimates the unknown dc motor parameters by adapting the adaptive model with the reference model created by experimental data onto armature current and speed response from separately excited dc motor .The field flux dynamics, which is usually ignored, is included to model the dynamics of the motor. The block diagram including the flux dynamics and model parameters is considered as the adaptive model. The integral time square error between the instant experimental data and the corresponding adaptive model data is taken as cost function. The Whale optimization algorithm is used to minimize the cost function. Additionally, to improve the performances of optimization algorithm and for accurate result, the experimental data is divided into three intervals which form the three inequality constraints. A fixed penalty value is added to the cost function for violating these constraints. The effectiveness of estimation with two different methods is validated by convergence curve.
Volume: 10
Issue: 1
Page: 83-92
Publish at: 2019-03-01

Impact of annealing temperature to the performance of hematite based humidity sensor

10.11591/ijeecs.v13.i3.pp1079-1086
W.R.W. Ahmad , M.H. Mamat , Z. Khusaimi , A.S. Ismail , M. Rusop
In the present study, hematite (α-Fe2O3) nanorod structure were grown on fluorine doped tin oxide coated glass substrate via sonicated immersion approach with variation of annealing temperature (350˚C – 600˚C) in one-hour treatment. The impact of varying the temperature of annealing treatment on crystalline phase, structure morphology, optical properties and humidity sensing performance of hematite were examined. X-ray diffraction pattern disclosed a rhombohedral structure with α-phase diffraction peaks. The surface morphology images taken from field emission scanning electron microscopy revealed that the hematite nanorod arrays were grown uniformly in all samples and the average diameters of nanorods were measured in the ranges between 55 and 80 nm. Ultraviolet–visible spectroscopy measurement spectra show that all samples exhibited good optical properties. The hematite humidity sensor sample annealed at 400°C has demonstrated the highest sensitivity response (S=177.78) to humidity range between 40%RH to 90%RH.
Volume: 13
Issue: 3
Page: 1079-1086
Publish at: 2019-03-01

Design and implementation of laser based intelligent embedded dual modes cruise control system using FPGA

10.11591/ijeecs.v13.i3.pp1014-1021
HuiNee Ow , Muataz H. Salih , ChinBeng Lim
Cruise control system is also known as speed control which use to take over the car from the driver and stabilize the car with the speed had been set. It is one of the important elements in the intelligent vehicles. Currently, driver has to accelerate the car until certain speed in order to activate cruise control system. After it had been activated, driver still needs to put on attention to decelerate the car when there is another one in front and possibility to get accident is high. To overcome this problem and enhance current cruise system, this project has two laser-based working modes. First one is normal mode that following the same current cruise system procedure. Second is pre-set mode that allow driver to enter required speed without necessity to use petrol pedal. Both modes will use laser transceivers to add on perception feature to cruise control system. The system is designed and implemented using FPGA as main processing technology. Also, Quartus II 13.0 SP is used and DE0-Nano board is utilized as project platform. The input management is implemented to handle all sensors data and feed main processing unit with proper data stream. The result is efficient in term of system response, accurate cruise control and trustable design as well. The implement system is achieved up to 1.3GHz and 1,337 logic elements are consumed.
Volume: 13
Issue: 3
Page: 1014-1021
Publish at: 2019-03-01

The development of science process skills in visually impaired students: analysis of the activities

10.11591/ijere.v8i1.17427
Aydın Kızılaslan
Students with visual impairments face tremendous challenges in daily life while learning life skills as they do not have the benefit of visual cues. The skills that visually impaired students are expected to learn include not only everyday life skills, but also scientific process skills too. In this study, case study was used to develop an instructional design to teaching science concepts to visually impaired students. The aim of this study is to analyze the efficacy of science activities of this developed instructional design. The study consists of three basic stages. In the first stage, visually impaired students’ learning needs are identified. In the second stage teaching materials and activities are designed and developed. In the last stage, these activities were analyzed in terms of scientific process skills through observation forms. As a result, most of the developed activities are suited for development of the scientific process skills.
Volume: 8
Issue: 1
Page: 90-96
Publish at: 2019-03-01

Analysis of series/parallel multilevel inverter with symmetrical and asymmetrical configurations

10.11591/ijpeds.v10.i1.pp300-306
Motaparthi Nagaraju , Malligunta Kiran Kumar
Usage of high power and medium voltage applications in domestic and industrial purpose has been increased in the recent years. Also, the penetration of renewable energy sources is increasing rapidly. To make use the renewable energy sources there is a need of using inverters. The basic inverter is conventional two level inverter which produces the square wave output voltage. The major drawback of conventional inverter is it contains more harmonics. Therefore, multilevel inverters have been introduced with staircase output voltage waveform. Lot of multilevel inverter topologies have been developed and cascaded H bridge type is the more frequently used. But, it requires more number of switches for higher output voltage level. In this paper, a novel 7 level asymmetrical multilevel inverter topology is proposed with less number of switches. This proposed topology is compared with already existing topology. The simulation of circuit and result analysis of the circuit is carried out by using Matlab/simulink software. The comparison between existing topology and proposed topology is given. The results are discussed and presented.
Volume: 10
Issue: 1
Page: 300-306
Publish at: 2019-03-01

Leadership change design: a professional learning community (PLC) project in eastern Indonesia

10.11591/ijere.v8i1.15662
Teddy Trilaksono , Ambara Purusottama , Ifa Hanifah Misbach , Irfan Hary Prasetya
A professional learning community (PLC) is a long-term sustainable program that can replace professional development (PD) to enable teachers to become teacher leaders and school principals to become instructional leaders. Using a case study from the establishment of the PLC project in 10 schools of Eastern Indonesia (Saparua island, Maluku), this research develops a progressive leadership change model through an ADDIE instructional design that changes school leadership. The research aims to investigate how to identify the most effective leadership change model by exploring differrent forms of learning communities between school principals and teachers. Using an action research approach to solve the problem, the data were collected over a 10-month period when the PLC project activities took place and embedded them as empirical materials that complement each other. The findings show that the leadership change design through PLC runs effectively if value alignment occurs between school principals and teachers after the open environment is established. The data also highlight that aligned values must be embedded as school identities, whereas a school principal must act as a change leader in order to ensure that these changes are sustainable. This study concludes by proposing policy recommendations for policy makers and education stakeholders on how to develop PD and PLC in Indonesian schools.
Volume: 8
Issue: 1
Page: 47-56
Publish at: 2019-03-01

Conceptual mobility model of vertical handover decision in heterogeneous networks

10.11591/ijeecs.v13.i3.pp1143-1151
Norakmar Arbain , Zolidah Kasiran
In heterogeneous network, maintaining seamless connectivity needs excessive efforts from various aspects such as network availability and mobile node reliability. Presently, a vertical handover management is a practical approach in facilitating the service continuity for mobile users. Many researches have been conducted in this area by considering performance improvement in delay, latency, and overhead. Preserving the Quality of Services (QoS) based on user mobility and pattern movement during handover decision has become an important aspect in vertical handover management. This paper presents the conceptual mobility model of vertical handover decision in heterogeneous network. Hence, several researches in vertical handover decision management has been reviewed regarding the issues on the vertical handover decision algorithms such as RSS Based Algorithm, MADM Based Algorithm and Intelligence Based Algorithm.  This paper highlights the current decision algorithms that integrate the traditional methods with intelligence algorithm for better optimization. In decision parameters, the user mobility pattern can be importance in terms of direction randomness and mobility speed.  Hence, a conceptual mobility-awareness model for vertical handover are been proposed in targeting some improvement of handover performance.
Volume: 13
Issue: 3
Page: 1143-1151
Publish at: 2019-03-01
1 2 3
...
2097 2098
Show 1434 of 2098

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration