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28,451 Article Results

The Effects of Stacking Sequence Layers of Hybrid Composite Materials in Energy Absorption under the High Velocity Ballistic Impact Conditions – An Experimental Investigation

10.11591/ijaas.v3.i3.pp130-140
Elias Randjbaran
In the current study, the effects of stacking sequence layers of hybrid composite materials on ballistic energy absorption, which were fabricated from Kevlar, carbon, glass fibres and resin have been experimentally investigated at the high velocity ballistic impact conditions. All the samples have equal mass, shape and density, but they have different stacking sequence layers. After running the ballistic test in the same conditions, the final velocities of the bullets showed that how much energy absorbed by the samples. The energy absorption of each sample through the ballistic impact has been calculated, accordingly , the decent ballistic impact resistance materials could be found by conducting the test. This paper can be further studied in order to characterise the material properties.
Volume: 3
Issue: 3
Page: 130-140
Publish at: 2014-09-01

Total Harmonic Distortion of Dodecagonal Space Vector Modulation

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5003
Babita Nanda
Space vector modulation technique is one of the best PWM technique which has been implemented to the Multilevel inverter circuit to get the purely sinusoidal cuurent .This is a important algorithm which is implemented in open wind induction motor.This type of I.M has great impact on Electric Drive system. SVM is nothing but the technique of switching algorithm .The Hexagonal space vector modulation has been implemented before , but elimination of higher order harmonics are not possible. Torque pulsation arises. Speed control of Induction motor was not smooth .so Dodecagonal (12) structure developed. A 12 side polygonal space vector structure is meant for eliminating (6n±1) harmonics in the phase current waveform throughout the modulating range. A high resolution of PWM technique is proposed involving multiple 12 sided polygonal (Dodecagonal) structure that can generate highly sinusoidal voltage at a reduced switching frequency. In this paper different values of frequencies have been taken for harmonic analysis. SVM method features a higher level of dc-bus voltage utilization compared to the conventional PWM.DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.4279
Volume: 4
Issue: 3
Page: 308-313
Publish at: 2014-09-01

Biomonitoring of Zn pollution by using Leaves, Stems and Roots of a Medicinal Plant Centella Asiatica

10.11591/ijaas.v3.i3.pp122-129
C. K. Yap , Ong G. H.
In this study, three parts (leaves, stems and roots) of Centella asiatica and surface soils were collected from 11 geographical sampling sites in Peninsular Malaysia. Ranges of Zn concentrations (µg/g dw) in soil was 102.70-826.11 while 81.16-198.56 for leaves, 56.27-146.93 for stems and 95.72-285.00 for roots. In C. asiatica, Zn accumulation was found the highest in roots followed by leaves and stems. Correlation analysis based on Zn concentrations between the three parts of plants and soils were found to be significantly (P< 0.05) correlated (root-soil, R= 0.973; leaves-soils, R= 0.955; stem-soils, R= 0.952). For the transplantation study, three sites were selected as unpolluted (UPM), semi-polluted (Balakong) and polluted sites (Sg. Juru). Based on transplantation study under experimental field and laboratory conditions, Zn concentrations in the leaves, stems and roots of C. asiatica were significantly (P< 0.05) higher after three weeks. The Zn accumulation was the highest in Sg. Juru, followed by Balakong and UPM which were in accordance with the Zn contamination levels in the soils. Thus, these experimental findings confirmed that leaves, stems and roots can reflect the Zn levels in the soils where C. asiatica were found. After three weeks of back transplantation to clean soils, the Zn levels in the three parts were still higher than the initial Zn level even though elimination occurred. In conclusion, all the above findings indicated that the leaves, stems and roots of asiatica are good biomonitors of Zn pollution.
Volume: 3
Issue: 3
Page: 122-129
Publish at: 2014-09-01

Kinect and Optimization Algorithm Based Mobile Robot Path Planning in Dynamic Environment

10.11591/ijeecs.v12.i9.pp6682-6690
Zhenzhong Yu , Weicou Zheng , Qigao Fan , Xin Liu , Jing Hui
Based on environmental awareness and effective path planning algorithm, effective robot path planning can be achieved. In this paper, the Kinect sensor, the latest vision sensing technology, is used to perceive the obstacles and terrain information in dynamic environment in real-time, which enables robots to realize effective path planning tasks in complex dynamic environment. Using the real-ime RGB image and 3D image produced by the Kinect sensor, the mobile robot peripheral environment information can be probed. The improved artificial potential field path planning algorithm is optimized by genetic trust method. As a result, it can solve the local minimum points and target unreachable problems in the traditional artificial potential field algorithm. Moreover, it can effectively improve the real-time performance of the algorithm, and eventually realize the optimization of real-time path planning tasks for a robot in dynamic environment. Finally, the experimental system is set up to verify the effectiveness of the proposed methods.
Volume: 12
Issue: 9
Page: 6682-6690
Publish at: 2014-09-01

Sensitivity analysis of simplified low cost converging thermal wave technique for thin bilayer solid

10.11591/ijaas.v3.i3.pp158-164
M. Shahril Shahril Bin Husin
In this paper, the sensitivity analysis of thermo physical parameters of the semi-infinite bilayer was presented by using a simplified converging thermal wave model. This is done under the consideration that radial flow of converging thermal wave substantially dominates in the first layer and axial thermal wave, dominates in the second layer. The sensitivity of the correlated parameters due to the 5%, 10% and 100% of increment were evaluated.. The results of the calculated temperature were simulated by Mathematica software, in order to generate a sensitivity analysis and examined by graphs. From this analysis, we concluded the optimum conditions, hence to be applied in the real experiment. Our merit on this report is for introducing a simple method of optical transient heating by using low cost equipment such as camera’s flash lamp and thermocouple, which may also apply to the short pulse laser measurement. A brief theory of the present work is presented and the results obtained from the simulation are discussed.
Volume: 3
Issue: 3
Page: 158-164
Publish at: 2014-09-01

Research on the Nonlinear Traffic Flow Time Sequence Prediction Model

10.11591/ijeecs.v12.i9.pp7014-7020
Zhu Hai Feng
This paper proposes a non-linear traffic flow time sequence prediction model aiming at the periodic and stochastic characteristics of the traffic flow. First, one-dimension traffic flow time sequence data are transformed to multi-dimension time sequence. Then the RBF neural network which has strong nonlinear prediction capability is applied to model. Finally the simulation experiment is used to testify to the model. The results of the simulation prove the prediction accuracy of the model with RBF neural traffic flow time sequence prediction model is much higher than the traditional one and the prediction results can be utilized in the practical traffic management. The results show that the nonlinear traffic flow time series forecasting model with nonlinear, non-stationary characteristics of different period randomness, chaos and uncertainty. The results of this study to forecast short-term traffic flow have certain theoretical and practical significance.
Volume: 12
Issue: 9
Page: 7014-7020
Publish at: 2014-09-01

Critical Impact Energy of Flat Nose Hard Projectile Causing Early Scabbing in Concrete Slab

10.11591/ijaas.v3.i3.pp112-121
Dr. Qadir Bux alias Imran Latif , Assoc. Prof. Dr. Ali Al Nuaimi , Prof. Dr. Ismail Abdul Rahman , Prof. Dr. Ahmad Mujahid Ahmad Zaidi
In this paper, 2D numerical simulation finite element analysis has been carried out for critical impact energy of flat nose hard projectile causing early scabbing in concrete slab, based on reflected stress wave propagation with elastic assumption of the classic wave equation, using ABAQUS software. Numerical simulation predictions were compared with experimental data and with the well established UMIST, NDRC, Li and Reid formulae and found comparable and reliable. The influence of hard projectile diameter with flat nose, and concrete wall thickness on critical impact energy was also investigated. It was found that the effect of critical impact energy is directly proportional to the thickness of concrete target and inversely proportional to the diameter of flat nose hard projectile.
Volume: 3
Issue: 3
Page: 112-121
Publish at: 2014-09-01

Direct Instruction Model to Increase Physical Science Competence of Students as One Form of Classroom Assesment

https://ijere.iaescore.com/index.php/IJERE/article/view/4475
Hendrik Wenno
Teacher as one important factors of the succes of the learning process, has an important role in learning. Teacher have to adapt the instructional design or model learning methods with the material to be taught. The purpose of the study was to determine the levl of student mastery on the concept of measurements throught direct instructioal model. Descriptive research with action in the class were used in this research to determinet the level of studet mastery on the measurement concept of the physical sciences in oreder to achieve competency. The samples were tweenty five of seventh grade of  student on the second semester of academic year 2012/2013 of 11th Ambon State Junior High School. The instrument used is the test items to measure mastery of concepts, namely (1) those items of performance tests to  measure proficiency in the use of measring tools made for teaching and learning activities takes place. (2) Those items daily tests to measure the level of mastery of the concepts of measurements. Total about thenty items with the form of objectie tests (multiple choice) with a score of 1 for a correct answer and 0 for a wrong answer). Data results of performance test to easure proficiency in the use of measuring tools were analyzed by calculating a qualitative descriptive () average, (b) standart deviation, (c) the range of the data, (d) number of classes, (e) the length of the class, (f) frequency distribution, (g) the median, (h) mode, whereas mastery of the concept data obtained through the daily tests, analyzed by quantitative descriptive. Performance tests scores and daily tests are converted into the category of excellent, goog, sufficient, and failed. The results showed that the level of student mastery of the material by measuring very good and well with the percentage of the final results of formative student tests, respectively 48.0 percent, and 44.0 percent. It can be concluded that the direct instructional model succesfully improve student learning outcomes, especially to the concept of measurement.DOI: http://dx.doi.org/10.11591/ijere.v3i3.6492
Volume: 3
Issue: 3
Page: 169-174
Publish at: 2014-09-01

Schemes for Extending the Lifetime of SSD

10.11591/ijeecs.v12.i9.pp6940-6945
Kai Bu , Hui Xu , Qiyou Xie , Wei Yi
The limited use lifetime is a significant drawback of the solid state disk (SSD). When the P/E cycles exceed the nominal endurance limit, the entire SSD is rendered non-functional as worn out. As the low endurance, the MLC Flash based SSD is not suitable used in lifetime-aware applications and the total-byte-written of conventional MLC SSD is much less than SLC SSD. In this paper, we proposed an Adaptively Level Adjusting Scheme to use the MLC Flash dynamically to storage different amount of data levels through the entire lifetime. The result shows that the MLC SSD adopting this method could be totally written 4.8X more data than conventional MLC SSD and 16.5% more than SLC SSD. Another simple method named Post Life Slavaging Scheme is also proposed to benefit from the post life of a MLC SSD. It can extend the real P/E endurance by 2X when the user capacity reduced to 92% of original cacapcity.
Volume: 12
Issue: 9
Page: 6940-6945
Publish at: 2014-09-01

Data Protection Issues in Higher Education with Technological Advancements

https://ijere.iaescore.com/index.php/IJERE/article/view/4471
Nigel McKelvey
Adhering to laws whilst working or studying in an educational establishment is often fraught with challenges. The Irish Data Protection Act 1988 (Amendment 2003) strives to protect the individual where their personal data is potentially being abused. The advancements in technologies have facilitated educational establishments by improving efficiencies and reducing costs. However, this paper will outline the salient features of the said Act and evaluate how well the law adapts with technologies such as cloud computing and biometrics. It will endeavour to align the law with these technologies and offer a critique of areas that are potentially lacking. Cases will be discussed where precedents have been set by the Irish Data Protection Commissioner and as a result, suggestions for a data protection policy for Higher Education will be proposed. Conclusions will draw upon research conducted and suggest whether the law, as it stands, it suitable with the technologies mentioned.DOI: http://dx.doi.org/10.11591/ijere.v3i3.6140
Volume: 3
Issue: 3
Page: 133-141
Publish at: 2014-09-01

Review of the UPFC Different Models in Recent Years

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5008
Mahmoud Zadehbagheri , Rahim Ildarabadi , Majid Baghaei Nejad
Unified Power Flow Controller (UPFC) is one of the most intriguing and, potentially, the most versatile classes of Flexible AC Transmission Systems (FACTS) devices. The UPFC is a device which can control simultaneously tree parameters line impedance, voltage, phase angle and dynamic compensation of AC power system. In order to analyse its true effects on power systems, it is important to model its constraints, due to various ratings and operating limits. This paper reviews on the different models of UPFC used in recent years and gives sets of information for each model of the UPFC in AC transmission. Then the different models are compared and features of each model are examined.DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.5982
Volume: 4
Issue: 3
Page: 343-355
Publish at: 2014-09-01

The Role of Government and NGO in Promoting Wellness of People with Down Syndrome

https://ijere.iaescore.com/index.php/IJERE/article/view/4476
Yeo Kee Jiar , Lina Handayani , Lu Xi
People with Down Syndrome (PWDS) experience cognitive delays indicated by difficulties with cognition, long-term memory and non-verbal problem solving skills. PWDS have specific speech and language impairments which affect all aspects of development. Some children develop difficult behaviors which cause family stress and affect social and educational inclusion. These deficits are worsened by a higher incidence of certain medical problems which were extensive from birth to old age. Being intellectually challenged, PWDS face many challenges and barriers to care for themselves, to lead rich and varied lives as well as to get involved in all aspects of community life. Besides helping them to assume responsibility for their own wellbeing, it is upon dedications from all parties to assist them to live a longer life expectancy with dignity and wellness intact. This paper aims to understand the scope of wellness for PWDS and the hindering factors as well as identifying contributions towards wellness of PWSD, its flaws and suggestions for improvement. The analysis and discussion is grounded in the context of Malaysia against the backdrop of PWDS across nations. This paper concludes that People with Disabilities (PWD) in Malaysia are protected by different laws and Acts. Many services are provided by government and NGO but these provisions do not benefit PWDS as much as their disabled peers who are not intellectually challenged. Job opportunities and total wellness especially after finishing the basic schooling seems quite bleak for PWSD due to their obvious cognitive delays and adaptive behaviors.DOI: http://dx.doi.org/10.11591/ijere.v3i3.6453
Volume: 3
Issue: 3
Page: 175-186
Publish at: 2014-09-01

Posttraumatic Growth and Resilience after A Prolonged War: A Study in Baghdad, Iraq

https://ijere.iaescore.com/index.php/IJERE/article/view/4478
Heyder Kamil Mahdi , Kususanto Prihadi , Shahabuddin Hashim
This study investigates the causal relationship between resilience and posttraumatic growth (PTG) among Iraqi students who are exposed to traumatic events especially after the war in 2003. A survey has been conducted among 450 students from the colleges of political science, media, science, and veterinary medicine at the University of Baghdad in academic year 2013 to 2014. Participants completed a survey that consisted of the Baghdad Trauma History Screen, Post-traumatic Growth Inventory, and Connor–Davidson Resilience Scale. Results indicate a significant positive influence of resilience on PTG. Implications of the results and recommendations for further research are discussed. DOI: http://dx.doi.org/10.11591/ijere.v3i3.6316
Volume: 3
Issue: 3
Page: 197-204
Publish at: 2014-09-01

The Hybrid Probabilistic Query Algorithms Based on Inconsistent Database

10.11591/ijeecs.v12.i9.pp6921-6931
Hongyu Gao
Integrity constraint is important to make data certain in relation database. Though there is plenty of uncertain information that is valuable and need to be searched and to be used. Combined with probabilistic database theory and on the basis of summarizing former results, this paper gives a new query plan aiming at inconsistent database. It uses the constraint methods including union, product, subtraction, selection, projection and link to repair inconsistent data effectively. Its probabilistic calculation with four elements and probabilistic query rewriting can overcome shortcomings of inconsistent databases. The experiments show these methods can decrease conflict of data.
Volume: 12
Issue: 9
Page: 6921-6931
Publish at: 2014-09-01

Implementation of a File System with Encryption and De-duplication

10.11591/ijeecs.v12.i9.pp6445-6453
Xiaoning Jiang , Xian Jiang , Wenhua Zhou , Yang Leng
With the rapid advance of society, especially the development of computer technology, network technology and information technology, there is an increasing demand for systems that can provide secure data storage in a cost-effective manner. In this paper, we propose a prototype file system called EDFS (Encryption and De-duplication File System), which provides both data security and space efficiency in storage systems. We adopt de-duplication technology called CDC (Content-Defined Chunking) to chunk the file and compute its unique fingerprint, lookup different blocks, then store different blocks on server to ensure storage efficiency. Thinking of security, we use convergent encryption to encrypt data blocks, which not only ensure data security but also improve the possibility of de-duplication. Finally, we describe a prototype implementation of EDFS based on FUSE [1] and present an analysis of the potential effectiveness, using real data obtained from a runtime database.
Volume: 12
Issue: 9
Page: 6445-6453
Publish at: 2014-09-01
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