After numerous numerical simulation on the distribution of the stress field in damage composite cross ply laminates we have elaborate an energy criterion. This energy criterion is based on the computation of some partial parts of the strain energy release rate associated with each damage types and for the three loading mode (mode I (opening mode), mode II (sliding mode) and mode III (tearing mode)). In the related criterion, linear fracture based approach, several hypothesis are used to simplify the damage criterion. The main objective with this approach is to estimate the initiation of transverse and longitudinal cracking mechanisms and the development of the damage.
The major focus of the study is to implement an open source firewall technology system intended for La Consolacion University Philippines (LCUP). The major concern of the project is to prevent an unauthenticated access to the Network Infrastructure of LCUP. The system is capable to detect, monitor, control and filter incoming and outgoing packets. A PfSense, is an open source network firewall and free distribution, FreeBSD customizable, having a Web interface was used. Two (2) PC-based routers were installed for two (2) separated campuses connected via VLAN. The study was found “very acceptable” based on the following criteria: data integrity, data confidentiality, non-repudiation and reliability. This shows that the system is highly recommendable for implementation.
This is an exploratory survey of T.C.P congestion control principles and techniques. By studying congestion control techniques used in T.C.P implementation software network. We can better comprehend the performance issue of packet switched the network and in particular, the public internet interaction between transmission control protocol (T.C.P) and Random Early Detection (R.E.D) gateway, can be captured using dynamical models. In order to curtail the escalating packet loss rates caused by an exponential increase in network traffic, active queue management technique Random Early Detection (R.E.D) have come into practice. Stochastic Fair Queuing (SFQ) ensures fair access to network resources and prevents a busty flow from consuming more than its fair share. In case of (Random Exponential Marketing) R.E.M, the key idea is to decouple congestion measure from performance measure (loss, queue length or delay) performance parameter NS- 2 Network stimulator
In the research work, the use of factorial mathematical model was adopted for the slumps dry of concrete mix in a Hot and Warm humid zones as functions of quantity of cement, water-cement ratio and quantity of aggregates, the composition of the concrete mix was optimized by varying the independent factors (variables) for various seasons within the zones through Box Wilson’s composite mathematical method. The optimum value for factors X1 and X2 and X3 and X4 were obtained for the Hot and Warm humid zones as Y2 = 106.8221. The electronic (computer) manipulations of the data generated from the experiments, the following graphs (1 – 8) were generated for a better understanding of interactions between the factors and value generated as a result.
This research work focused on the design, and optimization of the concrete mixture using factorial analysis. Data were collected for the concrete mixture proportion to observe the ratio of the mixture content. Factorial design analyses were used to design the concrete mixture. It was also used to optimize the concrete mixture of the variables. The results were discussed and were also recommended for concrete mixture.
This study considers the quality of concrete produced in warm and hot zones of south east, Nigeria. The quality of concrete mixture is of inevitable concern to all stakeholders in the construction industry in the zones when the climatic conditions of the zones are considered. Absence of National standards, environmental and climatic conditions and other factors are the main factors that affect the quality of concrete produced in the area. The affected mix ratio is examined and all the prevailing construction/production practices are considered. All necessary measures for improving the quality of concrete produced are surveyed considering the relationships between various variables used in the mixture. Three major factors (variables) that are found to be influencing the quality of concrete in the south east, Nigeria. The absence or lack of implementing the existing building code, climatic conditions in the zones and types of construction materials available, all remain the major variable influencing the quality of present concrete production in the zones of south east, Nigeria.
Wireless sensor network (WSN) is a network of independent nodes used for environment monitoring. At the same time WSN developers face challenges that come from failure of communication link due to limited energy. We need to integrate zero wastage and minimum energy consumption technology. As MAC protocol is more energy efficient protocol as compare to others Thus in this paper we use MAC protocol with continuous active/sleep mode rather than cyclic sleep mode. The major aim of this paper is to describe a bio inspired mechanisms using Quorum based technique that save energy at idle stage of the sensor. We try to extend the energy efficiency of sensors by estimating per sensor traffic load and using a grid based Quorum technique with MAC protocol continuous active and sleep schedule
This paper introduces a distributed generation based on standalone micro-hydro power generation system (40kW) using synchronous generator with DG (diesel generator). A micro-hydro power generation model is a run of river plant with synchronous generator directly coupled to the turbine. A back-to-back ac/dc/ac static converter is used as power conditioning system (PCS). This proposed design is very simple, reliable, efficient and all mechanical adjustments are eliminated by using a proposed power conditioning system through which electric grid connection can be made. Power quality improvement analysis is done using power quality analyzers and FFT analysis. Using FFT analysis, THD at load and inverter is analysed. The topology and dynamic performance of the proposed system has been demonstrated and validated by using MATLAB Simulink based simulations.
Speaker identification is a process of automatically identifying who is speaking on the basis of the individual information included in speech waves. Speaker identification is one of the most useful biometric recognition techniques in this world where insecurity is a major threat. Many organizations like banks, institutions, industries etc are currently using this technology for providing greater security to their vast databases. Speaker identification mainly involves two modules namely feature extraction and feature matching. Feature extraction is the process that extracts a small amount of data from the speaker’s voice signal that can later be used to represent that speaker. Feature matching involves the actual procedure to identify the unknown speaker by comparing the extracted features from his/her voice input with the ones that are already stored in our speech database. In this paper we present the overview of approaches of feature extraction using Mel Frequency Cepstrum Coefficients, which is most widely used feature in speaker identification system and feature matching GMM technique for Tamil speaker identification.
The present investigations concerned by synthesis of pure BPSCCO (Bi0.5Pb0.5)2 Sr2Ca1Cu2O8 and its variant yttrium containing composites with general formula Bi1-xYxPbSr2Ca1Cu2Oz and, where x = 0.1 ,0.2 and 0.3 mole % respectively .The samples were prepared via soultion route (Freeze Drying Technique ) to obtain nano-product . Yttrium has a moderate effects on the main crystalline superconductive 2212-phase as x amount of dopant increase as indicated in XRD measurements .AFM-and SE-microscopy accompanied with EDX proved that, solution route was the best homogeneous matrix and has exact molar ratios . Yttrium-dopant ions exhibit strong interactions on Raman spectral modes of 2212-phase ,while Y+++ ions have a slight effect on Tc’s even with maximum addition x = 0.3 mole.