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29,082 Article Results

WAMS-Based SSR Damping Controller Design for FACTS Devices and Investigating Effects of Communication Delays

10.11591/ijpeds.v6.i4.pp736-746
Mortaza Farsadi , Arash Ghasemi
Recent technological progresses in the wide-area measurement systems (WAMS) are realizing the centralized controls as a breakthrough for improving the power systems stability. The most challenging deficiency against WAMS technology is related to communication delays. If this latency is neglected, it can deteriorate the damping performance of closed loop control or even degrade the system stability. This paper investigates a conventional Wide Area Damping Controller (WADC) for a static synchronous series compensator (SSSC) to damp out the Sub-Synchronous Resonance (SSR) and also investigation of the destructive effect of time delay in remote feedback signal. A new optimization algorithm called teaching-learning-based- optimization (TLBO) algorithm has been implemented to normalize and optimize the parameters of the global SSR damping controller. The IEEE Second Benchmark Model is considered as the system under study and all simulations are carried out in MATLAB/SIMULINK environment.
Volume: 6
Issue: 4
Page: 736-746
Publish at: 2015-12-01

Multiloop and Prediction Based Controller Design for Sugarcane Crushing Mill Process

10.11591/ijaas.v4.i4.pp135-145
Sandeep Kumar Sunori , Pradeep Kumar Juneja , Anamika Bhatia Jain
In the present work a sugarcane crushing mill is presented as a MIMO system with high multivariable interaction.A linear model of the plant is taken with flap position and turbine speed as manipulated variables and mill torque and buffer chute height as controlled variables.The multiloop PI controller has been designed for this plant by first investigating the RGA and the value of Niederlinski index of this plant.The decoupling of this system is done and the respective open loop and closed loop step responses are observed and compared with those of the composite MIMO system. Also the performance of multiloop controller is compared with controller designed using model predictive control system strategy for this plant.
Volume: 4
Issue: 4
Page: 135-145
Publish at: 2015-12-01

Evaluation of h- and g-indices of Scientific Authors using Modified K-Means Clustering Algorithm

10.11591/ijaas.v4.i4.pp130-134
S. Govinda Rao , A. Govardhan
In this paper we proposed modified K-means algorithm to assess scientific authors performance by using their h,g-indices values. K-means suffers from poor computational scaling and efficiency as the number of clusters has to be supplied by the user. Hence, in this work, we introduce a modification of K-means algorithm that efficiently searches the data to cluster points by compute the sum of squares within each cluster which makes the program to select the most promising subset of classes for clustering. The proposed algorithm was tested on IRIS and ZOO data sets as well as on our local dataset comprising of h- and g-indices, which are the prominent markers for scientific excellence of authors publishing papers in various national and international journals. Results from analysis reveal that the modified k-means algorithm is much faster and outperforms the conventional algorithm in terms of clustering performance, measured by the data discrepancy factor.
Volume: 4
Issue: 4
Page: 130-134
Publish at: 2015-12-01

Towards More Reliable Renewable Power Systems - Thermal Performance Evaluation of DC/DC Boost Converters Switching Devices

10.11591/ijpeds.v6.i4.pp876-887
Canras Batunlu , Alhussein Albarbar
Power electronic converters (PECs) are one of the most important elements within renewable power generation systems. The reliability of switching elements of PECs is still below expectations and is a major contributor to the downtime of renewable power generation systems. Conventional technology based elements such as Silicon Insulated Gate Bipolar Transistors (IGBTs) operate as switching components in PECs. Recent topological improvements have led to new devices called Silicon Carbide (SiC) MOSFETs which, are also being used as switching elements for PECs. This paper presents detailed investigations into the performance of those switching devices with a focus on their reliability and thermal characteristics. Namely, trench gate NPT, FS IGBT topologies and SiC MOSFET are firstly modelled using 3-D multi-physics finite element modelling to gain clear understanding of their thermal behaviour. Subsequently, modelling outcomes are verified by using those devices as switching elements in operational boost converters. The purposely-developed test setups are utilised to critically assess the performances of those switching devices under different loading and environmental conditions. In general, SiC device was found to exhibit about 20 °C less in its operating temperature and therefore expected to offer more reliable switching element.
Volume: 6
Issue: 4
Page: 876-887
Publish at: 2015-12-01

Effects of School Absences on GPAs for Disabled Students

10.11591/ijere.v4i4.4507
Elizabeth Christani , Laura Revetti , Ashleigh Sue Young , Karen H Larwin
Chronic absences, suspensions, and expulsions can all be detrimental to students’ GPAs. Students with disabilities have a disadvantage with learning and require additional services making it crucial that they are present in school. There are various reasons why students miss school and the study examined a few specific research questions. The current investigation examined students’ current GPA scores in the core content areas compared to the number of days absent from school, the frequency of health related school absences, and the number of days spent out of school due to suspensions and expulsions, using data from a national data set. This investigation examines whether or not attendance is related to students’ academic success, when specifically considering students with identified disabilities.
Volume: 4
Issue: 4
Page: 165-169
Publish at: 2015-12-01

Development of Digital Controller for DC-DC Buck Converter

10.11591/ijpeds.v6.i4.pp788-796
Sarun Soman , Sangeetha T.S.
This paper presents a design & implementation of 3P3Z (3-pole 3-zero) digital controller based on DSC (Digital Signal Controller) for low voltage synchronous Buck Converter. The proposed control involves one voltage control loop. Analog Type-3 controller is designed for Buck Converter using standard frequency response techniques.Type-3 analog controller transforms to 3P3Z controller in discrete domain.Matlab/Simulink model of the Buck Converter with digital controller is developed. Simualtion results for steady state response and load transient response is tested using the model.
Volume: 6
Issue: 4
Page: 788-796
Publish at: 2015-12-01

Internationalization of Higher Education: Potential Benefits and Costs

10.11591/ijere.v4i4.4511
Tahira Jibeen , Masha Asad Khan
AbstractInternationalization of higher education is the top stage of international relations among universities and it is no longer regarded as a goal in itself, but as a means to improve the quality of education.  The knowledge translation and acquisition, mobilization of talent in support of global research and enchantment of the curriculum with international content are considered to be the benefits of internationalization of higher education. Though, internationalization holds many positives to higher education, there are grave risks associated with this multifaceted and growing phenomenon. Negative aspects include commercial profit, academic colonization and difficulty in ensuring quality education. The current review has implications for educational policy makers to ensure positive and reciprocal benefits to the higher education institutions and the countries concerned. 
Volume: 4
Issue: 4
Page: 196-199
Publish at: 2015-12-01

Development and Simulation of Stand Alone Photovoltaic Model Using Matlab/Simulink

10.11591/ijpeds.v6.i4.pp703-711
Himanshu Sharma , Nitai Pal , Yaduvir Singh , Pradip Kumar Sadhu
This paper presents the implementation of a generalized photovoltaic model using Matlab/Simulink software package, which can be representative of PV cell, module for easy use on simulation platform. The proposed model is designed with a user-friendly icon and a dialog box like Simulink block libraries which makes the generalized PV model easily simulated and analyzed in conjunction with power electronics. Taking the effect of sunlight irradiance and cell temperature into consideration, the output current and power characteristics of PV model are simulated and optimized using the proposed model. The proposed model enables the dynamics of PV power system to be easily simulated, analyzed and optimized.
Volume: 6
Issue: 4
Page: 703-711
Publish at: 2015-12-01

Model of Health Care Support And Father Support for Mother on Children Under 2 Years Emotion in Blitar

10.11591/ijere.v4i4.4508
Tri Riana Lestari , Tjipto Suwandi , Nursalam Nursalam , Moersintowarti B. Narendra
Toddler stage is referred to as the golden era (golden age period), especially at the age of 0-2 years, the brain developmentreach 80%. This study examines the effects of healthcare support andf ather support for mother on the emotions of children aged under 2 years. This study was observational, with cross-sectional design.The sampling method in this research was multistage random sampling method in three sub districts and 20 villages. The total sample was 279 mothers and their children aged 3 months to 2 years in Blitar. Inferential data analysis using PLS (Partial Least Square) version 2.0.The result was that the children's emotions were formed by psychological factors of mother that affected by father factorsand health care support.
Volume: 4
Issue: 4
Page: 170-178
Publish at: 2015-12-01

Design and Development of Leg-Wheel Hybrid Hexapod along with Machine Learning Algorithm implementation

10.11591/ijra.v4i4.pp262-268
Harikrishnan Madhusudanan
The conventional mobile robotic platforms which either uses wheels or legs are quite familiar and each one of them has its own advantages and disadvantages. The wheeled robot is suitable for only plain and smooth terrain, whereas the legged robot can travel in any kind of terrain but is comparatively slower than the wheeled robot. So, a hybrid of both wheeled and legged platform would be quite suitable for any kind of terrain. The primary focus of this paper is to design and develop a leg-wheel hybrid robotic platform with a concurrent engineering and mechatronics approach to produce results with optimised design metrics at each and every stage of its development. An overall view of the entire mechatronics system is considered for design and development of the robot at each and every stage rather than a sequential engineering approach.
Volume: 4
Issue: 4
Page: 262-268
Publish at: 2015-12-01

Evaluation of Continuous Assesment Practice by University Lecturers

10.11591/ijere.v4i4.4514
Patrick uzo Osadebe
The study evaluated the extent to which Continuous Assessment (CA) was practiced by university lecturers in Delta State University, Abraka, Nigeria. The evaluation of continuous assessment focused on the cognitive, affective and psychomotor domains of students’ behaviour. That is teaching and learning should focus on these areas. Two research questions were raised, and two hypotheses were tested to achieve the purpose of the study. A sample of 200 lecturers was randomly selected using simple random sampling and stratifies random sampling techniques. A 5-point scaled questionnaire was used as an instrument to collect data. The validity of the instrument was determined through expert judgement and factor analysis. Thus the instrument has face and construct validities. The reliability of the instrument was established through Cronbach Alpha. A reliability coefficient of 0.86 was obtained as a measure of internal consistency. The data collected were analyzed. The research questions were answered with the use of mean. The hypotheses were tested with Z-test at .05 level of significance. The result of evaluation revealed that the extent to which university lecturers practice continuous assessment with emphasis on the cognitive, affective and psychomotor domains of students’ behaviour was low. There was no significant difference between male and female as well as junior and senior lecturers on the practice of continuous assessment in the university. It was noted that there should be a continuous and effective monitoring of continuous assessment practice by the university lecturers.  
Volume: 4
Issue: 4
Page: 215-220
Publish at: 2015-12-01

A Nonlinear Model to Study Selectively Deformable Wing of an Aircraft

10.11591/ijra.v4i4.pp316-325
Deiva Ganesh A
Aeroelasticity of an aircraft includes the study of dynamics of prime movers, structural dynamics, and aerodynamics. Research efforts are on in every area to improve the overall performance of an aircraft. In this paper preliminary studies conducted on the dynamics of selectively deformable wing using an under actuated nonlinear model is reported. First, the literature related to the design and analysis of selectively deformable structure (SDS) wing is reviewed. Second, a single degree of freedom (DOF) model to represent a fixed wing and a two DOF under-actuated model to represent SDS are discussed and their mathematical models are derived. Third, the effect of deformable wing portion on the wing dynamics is studied by varying the excitation frequency and stiffness of the model. Fourth, an experimental setup consisting of two rigid links connected by spring and subjected to sinusoidal displacement is investigated. Final section summarizes the research and provides directions for future work.
Volume: 4
Issue: 4
Page: 316-325
Publish at: 2015-12-01

Two-Degree-of-Freedom PID Controller, Its Equivalent Forms and Special cases

10.11591/ijra.v4i4.pp269-283
Haresh A. Suthar
The design of control systems is a multi-objective problem so, a two-degree-of-freedom (abbreviated as 2DOF) control system naturally has advantages over a one degree- of-freedom (abbreviated as 1DOF) control system. The main objective of 2DOF control is to control both set point tracking and disturbance rejections.Various 2DOF PID controllers and its equivalent transformations were proposed for industrial use by different researchers. Most of the above researches were published in Japanese language and have not been translated into English language yet. An objective here is to provide detail analysis regarding structure of 2DOF controller, its equivalent forms and its special cases. A system transfer function having transport delay and load disturbance is considered as a test bench to verify various 2DOF control strategies. MATLAB is used as software tool to verify the various 2DOF control strategies. The analysis will be helpful to the engineers and researchers to understand the topic in detail for further exploration.
Volume: 4
Issue: 4
Page: 269-283
Publish at: 2015-12-01

Eco-Tourism Development Strategy Baluran National Park in the Regency of Situbondo, East Java, Indonesia

10.11591/ijere.v4i4.4510
Adil Siswanto , Moeljadi Moeljadi
Baluran National Park in the regency of Situbondo, East Java-Indonesia, highly prospective for development of sustainable tourism that can improve the welfare of local people. The suitable tourism type is eco-tourism with local people envolvement.The purposes of this study were: 1). To know the local people envolvement in eco-tourism development; 2). To know the potenciesof Baluran National Park; and 3). To formulateEco-tourism Development Strategy.Using the matrix analysis method of IFAS and EFAS, produce a common strategy; SWOT analysis generates alternative strategies. This research was exploring, to formulate policies and programs based internal and external conditions. Data were collected by questionnaire, interview and observation. The number of respondents 25 people who are competent in the field of tourism.The results showed, local people envolvement of Wonorejo, Bajul Mati, Bimo Rejo, Watu Kebo, Sumber Waru and SumberAnyaras buffer villages, in the development of eco-tourism in Baluran National Park needs to be improved through approach, training and community empowerment. Alternative strategy obtained eco-tourism product development strategy; development of basic infrastructure and facilities as well as supporting tourism; tourist market penetration and promotion; increased security; as well as institutional and human resource development strategy of eco-tourism. Eco-tourism development strategy is a strategic priority of generating eco-tourism product development programs and maintaining biological resources.
Volume: 4
Issue: 4
Page: 185-195
Publish at: 2015-12-01

Two Term Approximation for Near Field Analysis of Wire Scatterers

10.11591/ijict.v4i3.pp117-123
Vaibhav Suresh Yavalkar
This paper presents an analysis of near field of wire scatterers. In this paper, the exact distribution on wire scatterers is approximated using a more accurate two term approximation for the ease of closed form analysis. It has been shown that the results obtained using the two term approximation are very close to the cosinusoidal distribution for the element length up to 0.7  with less than 5% error in the field evaluated from this approximation. This analysis formulation is useful in estimating fields form wire scatterers, mutual coupling in an array of scatterers or analysis of Yagi-Uda antennas.
Volume: 4
Issue: 3
Page: 117-123
Publish at: 2015-12-01
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