Academic Research Publishing Agency Press
International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366

Volume 9, Issue 1 (October, 2011)

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1. RESEARCH OF NEURONAL MORPHOLOGY’S CLASSIFICATION AND RECOGNITION
by Sun tao, Lin liang & Huang Qiaoyu
Abstract

By comparing cluster analysis, BP neural network, This paper establishes a classification model based on fuzzy clustering  identification, and has obtained good classification results; analyzes the same neurons’ different characteristics in different animals, obtaining aggregates of neurons can better classify neurons, but  can not distinguish the different morphological characteristics in different animals, The use of the component indicators of neurons can  distinguish them clearly.


2. ON OSCILLATORY OSEENLETS: THE FORCES GENERATED BY THEM, THE FAR FIELD EXPANSION OBTAINED USING THEM, AND THEIR RELATION TO OSCILLATORY STOKESLETS

by Edmund Chadwick & Rabea Elmazuzi

Abstract

Consider uniform flow past an oscillating body. Assume that the resulting far-field flow consists of both steady and time periodic components. The time periodic components can be decomposed into a Fourier expansion series of time harmonic components. The form of the steady component in terms of the steady oseenlet is well-known. However, the time-harmonic components in terms of the oscillatory oseenlet do not yet appear to be in the literature.

The oscillatory oseenlet solution is presented for the velocity and pressure, and the forces generated by them are calculated and shown to be oscillatory. The formulation is checked against known solutions in the following two limits: As the frequency of the oscillations tend to zero, it is shown that the steady oseenlet solution is recovered; Also, as the Reynolds number of the flow tends to zero, it is shown that the oscillatory stokeslet solution is recovered. Both the oscillatory stokeslet and oscillatory oseenlet solutions are represented by velocity potentials, and the oscillatory oseenlets are used to give a far-field velocity expansion.

3. DESCRIPTION OF MAXIMAL IDEAL SPACE OF math
by Huseyin Tuna & Aytekin Eryilmaz
Abstract

Let mathdenotes the vector space of real-valued functions which nth order derivatives are Lebesgue integrable over [0,1] we prove thatmath is a Banach algebra with multiplication as Duhamel product math and describe its maximal ideal space.


4. MAINTAINING USER DEFINED QOS IN PROPOSED MB OFDM COGNITIVE RADIO SYSTEM USING POWER CONTROL AND CHANNEL CAPACITY ANALYSIS AS DESIGN TOOLS FOR SUBCARRIER SELECTION
by Andre Mayers & G.V.S Raju
Abstract

The objective of this paper is to study various methods of maintaining user defined Quality of Service (QoS) in a wireless Cognitive Radio (CR) System. The agility of CRs can be used to make adjustments to Bit Error Rate (BER), Bit Rate (BR) and transmit Power Spectral Density (PSD). We present a modified channel capacity analytic formula, methods for a power control algorithm, and methods for decision making on spectrum allocation. We show how parameters such as BER, Signal to Interference Noise Ratio (SINR) thresholds, and analysis and design based on our modified channel capacity formula can be subtly manipulated to affect QoS. The power control algorithm is part of a system that maintains user defined BER and BR in the presence of external user interference. This system is a design tool with which to achieve predictable and consistent QoS.


5. INTEROPERABILITY BETWEEN THE IMPROVED METAGRAPH HAD AND GRAFCET: CASE OF THE POWER NETWORK OF CAMEROON
by Marcellin Nkenlifack, Emmanuel Tanyi & Landry Domche
Abstract

This article presents the modeling and the control of the Power Network of the Southern Cameroon (PNSC). We are using the effectiveness of improved version of HAD, which allows an object modeling of hybrid and complex dynamic systems. Then we show how to derive from the models obtained, the Grafcet models of the PNSC, by implementing bridges between HAD and the reference language of Grafcet. The application to the Control and the Monitoring of the Cameroonian electrical Power Network enables us to better determine the complexity of the system, thanks to an approach structuring the various objects by taking in consideration the physical structure and the causality of their interactions. On the other hand, interoperability with Grafcet would facilitate the implementation and the synthesis of discrete or hybrid controllers.


6. TWO – QUADRANT CONVERTER WITH RNSIC - ANALYSIS AND SIMULATIONS
by Mariana PLETEA (Moisa), Irinel Valentin PLETEA, Dimitrie ALEXA &Dan Dorin CEPAREANU
Abstract

In the AC/DC transfer mode the converter works as a rectifier with near sinusoidal input currents (RNSIC), while in the DC/AC transfer mode it works as a square-wave pulse switching inverter. Some suggestions for the converter design are given and a comparison with two–quadrant PWM converter is made.


7. MICROWAVE ANTENNA PATTERN WITH DIFFERENT PARAMETER EVALUATION IN MOBILE ENVIRONMENT
by D.S. Ramkiran, A. RamaKrishna, Ch. Radhika & B.T.P. Madhav
Abstract

Antenna is a “a metallic (usually) device used for radiating or receiving electromagnetic waves which acts as the transition region between free space and guiding structure like a transmission line in order to communicate even in a longer distance”. Antenna pattern, antenna tilting, gain and antenna height all affect the cellular system design.

The antenna pattern can be omni directional, directional, or any shape in both the vertical and the horizon planes. The antenna patterns seen in cellular systems are different from the patterns seen in free space. If a mobile unit travels around a cell site in areas with many buildings, the Omni directional antenna will not duplicate the Omni pattern. In addition, if the front-to- back ratio of a directional antenna is found to be 20 dB in free space, it will be only 10 dB at the cell site. Antenna tilting can reduce the interference to the neighboring cells and enhance the weak spots in the cell. Also the height of the cell-site antenna can affect the area and shape of the coverage in the system.


8. PARAMETER OPTIMIZATION IN THE DESIGN OF A GRID-SIDE CONVERTER CONTROLLER IN THE LIGHT OF GRID FAULTS
by C.A. Nwosu & C.U. Ogbuka
Abstract

Parameter Optimization in the Design of a Grid-side Converter Controller in the Light of Grid faults is presented. The primary aim is to provide for a fault-ride-through (FRT) capability of Wind Turbine with Doubly Fed Induction Generator in the Light of new grid codes. New grid codes require that the wind turbines remain continuously on-line and supply the grid during voltage sags. An active damping criterion that has the capacity to inhibit the abnormal rise of the DC-link current and voltage, stator currents and hence rotor currents during voltage sag is implemented. This is achieved by introducing an optimum active resistance (performing the damping) in the minor feed-back loop of the grid-side converter current controller. Against the abnormal rise in the DC-link voltage capable of exciting the switching of a protective system, a constant DC-link voltage of almost 80 per cent of the nominal value is achieved. Also, against the increase to about twice its nominal value, the nominal magnitude of the rotor current is maintained throughout the duration of the fault.


9. ON COMMON FIXED POINT THEOREMS FOR MULTIVALUED MAPPINGS IN INTUITIONISTIC FUZZY METRIC SPACES
by Hariom Dubey & Kamal Wadhwa
Abstract

The aim of this paper is to obtain some common fixed point theorems in an intuitionistic fuzzy metric space for two pairs of occasionally weakly semi compatible hybrid mappings.


10. COMMON FIXED POINT THEOREM FOR SUB COMPATIBLE AND SUB SEQUENTIALLY CONTINUOUS MAPS IN FUZZY METRIC SPACE USING IMPLICT RELATION
by Kamal Wadhwa, Farhan Beg & Hariom Dubey
Abstract

The present paper introduces the new concepts of sub compatibility and subsequential continuity in fuzzy metric spaces  using Implict Relation which are weaker than occasionally weak compatibility and reciprocal continuity. In general all known results on commuting, weakly commuting, compatible, weak compatible, semi compatible and occasionally weak compatible maps in fuzzy metric spaces are generalized in this note.


11. FEEDBACK CONTROL OF RECURRENT NEURAL NETWORKS WITH TIME-VARYING
by M. Ratchagit, P. Sangapate, W. Sasanit, P. Sornkrew, J. Joomwong & K. Ratchagit
Abstract

This paper deals with the problem of delay-dependent stability criterion of discrete-time recurrent neural networks with time-varying delays. Based on quadratic Lyapunov functional approach and free-weighting matrix approach, some linear matrix inequality criteria are found to guarantee delay-dependent asymptotical stability of these systems. And one example illustrates the exactness of the proposed criteria.


12. CONSTRUCTION OF - CUT FUZZYmath AND math CONTROL CHARTS USING FUZZY TRAPEZOIDAL NUMBER
by A. Pandurangan & R. Varadharajan
Abstract

Statistical Process Control (SPC) is used to monitor the process stability which ensures the predictability of the process. In 1920’s Shewhart introduced the control chart techniques that are one of the most important techniques of quality control to detect if assignable causes exist.


13. FUZZY MODELING FOR ELECTRICAL DISCHARGE MACHINING OF ALUMINUM ALLOY
by P. Srinivasa Rao, K. Eshwara Prasad & B. Sidda Reddy
Abstract

Electrical discharge machining (EDM) is widely used process in the production of mould / dies, aerospace, automobile and electronics industries where intricate complex shapes need to be machined in very hard materials. The selection of the AISI 64430 was made taking into account its wide range of applications in the industrial field: defense, pharmaceutical, aerospace, shipbuilding industries etc. In this paper an attempt has been made to develop the mathematical model for predicting die-sinking electrical discharge machining of AISI 64430 (HE 30) aluminum alloy characteristics such as the metal removal rate (MRR), the tool wear rate (TWR), the surface roughness (Ra value) and the hardness(HRB) using fuzzy mathematical method. The process parameters taken in to consideration were the current (I), the open-circuit voltage (V), the servo (Sv) and the duty cycle (η). A fuzzy rule base characterizing the relationship between input and output parameters was built through experiments. The design of experiments technique has been used to conduct the experiments, which in turn reduced the number of experiments. The prediction of metal removal rate, the tool wear rate, the surface roughness and the hardness was achieved under the condition of given input parameters by rule-based fuzzy reasoning. The predicted results were analyzed through experimental verification. The model predicted values and measured values were fairly close to each other. To have more precise investigation into the model, a regression analysis of experimental and predicted outputs was performed. It was found that the R2 (R: coefficient of determination) values are 0.9015, 0.9702, 0.9932 and 0.844 for the metal removal rate, the tool wear rate, the surface roughness and the hardness, respectively.


14. APPLICATION OF HOMOTOPY PERTURBATION METHOD ON OSCILLATOR OF COMPLEX VARIABLE
by Hamed Goodarzian
Abstract

In this work a nearly new established analytical approach, He’s homotopy-perturbation method (HPM) has been applied to solve the differential equation of oscillator with a high degree of The objective of this paper is to present an analytical investigation to analyze the vibration cubic positive nonlinearity of complex variable in nonlinear dynamic systems. The comparison of the solution obtained by HPM has are done against the numerical solution in confirmation of the applicability of the method and its effectiveness in solving problems with high degree of nonlinearity.


15. HYBRID SOLAR AND WIND POWER: AN ESSENTIAL FOR INFORMATION COMMUNICATION TECHNOLOGY INFRASTRUCTURE AND PEOPLE IN RURAL COMMUNITIES
by I.A. Adejumobi, S.G. Oyagbinrin, F. G. Akinboro & M.B. Olajide
Abstract

One of the primary needs for socio-economic development in any nation in the world is the provision of reliable electricity supply systems. This work is a development of an indigenous technology hybrid Solar -Wind Power system that harnesses the renewable energies in Sun and Wind to generate electricity. Here, electric DC energies produced from photovoltaic and   wind turbine systems are transported to a DC disconnect energy Mix controller. The controller is   bidirectional connected to a DC-AC float charging-inverter system that provides charging current to a heavy duty storage bank of Battery and at the same time produces inverted AC power to AC loads. The 2002-2009, 8years wind velocity data for Abeokuta and its environs were collected. The two parameters Wielbull distribution was used to simulate power in W/m2 densities for the 8-years period. The step by step design of 1000W solar power supply system’s was done as a sample case. Load estimates of a typical rural community and for rural ICT infrastructures were estimated. Simulation of wind power capacity in W/m2   in Abeokuta, Ogun State Nigerian   was done based on the obtained wind data. The results showed that the average exploitable wind power density between 4W/m2 and 14.97W/m2 is realizable and that development of hybrid wind-solar system for off- grid communities will go a long way to improve socio-economy lives of people.


16. THE LEVEL OF COMPLIANCE OF SELECTED NIGERIAN X-RAY DEPARTMENTS TO EUROPEAN GUIDELINES ON GOOD RADIOGRAPHIC TECHNIQUES
by Bamidele L. & Nworgu O.D.
Abstract

European directive (particularly the directive 97/43/EURATOM) and the various publications of Commission of European Communities (CEC) may be considered as landmarks of the new approach to the problems of dose reduction and quality in diagnostic radiology. The CEC publication includes examples of good radiographic technique for a number of common X-ray examinations, which if these guidelines are followed, compliance with dose and image quality criteria as specified in the document should be demonstrated. Studies in some countries have shown that a number of X-ray departments are not using optimum techniques. This study aimed at examining level of adherence of some selected hospitals in Nigeria to the CEC guidelines. Four hospitals were considered in the study, three of which are University Teaching Hospitals and Public Hospital. The following details on techniques and equipment were recorded for chest, abdomen, pelvis, skull and lumber spine examinations of standard sized patients: tube potential (kVp), focus-to-film distance (FFD), automatic exposure control (AEC), film-screen combination. From the study, varying level of adherence to guidelines were evident, with no hospitals demonstrating 100% compliance.


17. CHEMICAL EVALUATION OF PROXIMATE COMPOSITION, ASCORBIC ACID AND ANTI-NUTRIENTS CONTENT OF AFRICAN STAR APPLE (CHRYSOPHYLLUM AFRCANUM) FRUIT
by Edem Christopher A. & Miranda I. Dosunmu
Abstract

The proximate composition, ascorbic acid content and anti-nutrient composition of Chrysophyllum africanum fruits was investigated. The proximate composition analysis showed the results to be, moisture 66.67%, Carbohydrate 78.34%, protein 5.66%, fibre 4.50%, fat 9.83%, ash 2.12% and total energy value 420.42 kcal The ascorbic acid content was 19.68%.The anti-nutrients composition was observed to be oxalate 4.95mg, saponins 3.66 %, Cyanogenic glycoside 0.17%, phylate 0.02% and tannins 0.03 %.The study showed that Chrysophyllum africanum fruit contain high carbohydrate and this makes it a good source of energy for human nutrition while the high moisture content gives it a very short shelf life.


18. MANAGING RISK AND INTERNAL AUDITING
by Silvia Popescu & Abdelnaser Omran
Abstract

The study aims to demonstrate the role of internal audit as a pillar of support for management. The paper will present how the internal audit helps the organization to achieve its objectives by evaluating, through a systematic and methodical approach, its risk management processes, control and governance by formulating proposals for enhancing its effectiveness. In the present study are made on the conceptual concepts of internal control and internal audit highlighting the significance and role of internal audit in providing advice, counseling feedback strands within an organization. It is discussed in this paper and delineation of objectives and scope of activity of internal audit and internal public audit. During much attention is paid to the work of internal audit planning as it appears from research and case studies that incorrect or incomplete planning leads to a loss of risk-bearing activities. The practice requires careful selection of activities in high risk areas audited, based on the risks associated with these activities. It follows from the analysis of economic and financial and administrative practices of firms, the performing case studies, the effectiveness of internal audits is expected if we apply a risk management policy. Therefore in the paper, which thus completed the theoretical component applied this policy are outlined objectives, criteria for risk assessment, a model of analysis and evaluation of risk (resulting from the analysis of international good practice) guidelines for establishing criteria for prioritization risk identification procedure and risk analysis, risk assessment methodology for the preparation of internal audit plan.


19. PERSONAL AND PROFESSIONAL NEEDS FOR THE PROJECT LEADER IN THE LIBYAN CONSTRUCTION INDUSTRY
by Salahaldein Alsadey, Abdelnaser Omran & Abdul Hamid Kadir Pakir
Abstract

The quality of leadership is one of the most important factors in determining the success and survival of groups and organizations. The purpose of this paper is to examine the leadership needs of the project leader in the Libyan construction companies. The objective was identified the most important and crucial personal and professional needs of the project manager. This study attempted to identify the needs of the project leaders in the construction industry in Libya. As results, this paper was found that the factor “concise and rational” ranked as the first personnel needs factors. Meanwhile, “versatile” was considered the first professional needs that the project leaders should possess.