Biomaterial Strategies for Immune System Enhancement and Tissue Healing
Qualitative and Quantitative Performance Optimization of Simple Gas Turbine Power Plant using Three Different Types of Fuel
Efficient Shopping: RFID-Powered Cart with Automated Billing System
Medical Drone System for Automated External Defibrillator Shock Delivery for Cardiac Arrest Patients
A Critical Review on Biodiesel Production, Process Parameters, Properties, Comparison and Challenges
Review on Deep Learning Based Image Segmentation for Brain Tumor Detection
Chemistry and Chemical Engineering: Approaches, Observations, and Outlooks
Integration of PMS Software and Decision Matrix Tool Based on Data Acquired from Latest IT Advanced Sensors and 3D CAD Models in Marine Operations Field
A Series of Tool-Life Studies on Aluminium Matrix Hybrid Composites
Dynamic Changes in Mangrove Forest and Lu/Lc Variation Analysis over Indian Sundarban Delta in West Bengal (India) Using Multi-Temporal Satellite Data
The Impacts of Climate Change on Water Resources in Hilly Areas of Nepal
An Analysis of Machining Forces On Graphite/Epoxy, Glass/Epoxy and Kevlar/Epoxy Composites Using a Neural Network Approach
Deformation Behaviour of Fe-0.8%C-1.0%Si-0.8%Cu Sintered P/M Steel during Powder Preform Forging
A Series of Tool-Life Studies on Aluminium Matrix Hybrid Composites
Achieving Manufacturing Excelence by Applying LSSF Model – A Lean Six Sigma Framework
Design and Analysis of Piezo- Driven Valve-Less Micropump
Segmentation is the most common way to identify various constituents of an image. In medical image visualization and analysis, segmentation is an indispensable step in the processing of images. In this paper, we propose an unsupervised fuzzy based segmentation to derive the homogeneity measure for partitioning the regions of the image during the process of segmentation. The proposed approach proceeds in 2 stages. Initially, a Fuzzy C-Mean algorithm is used to provide a partition of the image. In the second Stage, a decision process by applying a global analysis followed by a fine segmentation which is only focused on ambiguous points. The feasibility and effectiveness of the proposed method is evaluated with the various types of MRI brain images to identify the components of brain, in turn, used to locate the brain tumour and its growth rate.
This paper describes the design, implementation and management of an integrated partial physical infrastructure of a wireless local and wide area (WLAN, WWAN) networking system. The system objectives are to serve and support the existing networking and data communications services of Palestine Polytechnic University PPU, and to facilitate connectivity of buildings within university campuses. The system consists of two main components: the first one represents a WLAN that is based on the communication protocol 802.11b, whiles the second represents the WWAN that connects two main buildings using two access points and radio frequency transmission technology. As a measure of performance, preliminary results showed that the system maintains an acceptable and secure data transfer rate between the sending and receiving sites. The speed of data while connection is maintained varies in the range of 2 to 10 Mbps and 10 to 50 Mbps for an indoor WLAN and an outdoor WWAN respectively. These findings are a good evidence of the efficiency of the integrated communication system with low operational cost and with feasible practical implementation.
A generalized model for analyzing any manufacturing system is essential to improve its performance measures. Non - traditional optimization technique such as Simulated Annealing technique provides a complete solution methodology for solving the shop floor scheduling problems. The problem considered in this study consists of non-identical machines employed in parallel. Jobs ranging from 10 to 100 are to be processed on any one of the five non identical parallel machines. The objective is to reduce the completion time of the jobs. Simulated annealing methodology has been adopted to reach the optimal sequence. It has been found that the suggested optimization procedure arrives at the optimal solution at a reasonable time and is also found to outperform the existing heuristics.
This paper mainly aims at suggesting methods to improve the efficiency of the e-learning applications by making use of the optimal TCP/IP Congestion control algorithm. This is done by first analyzing the various TCP Congestion control algorithms and comparing their performance. An investigation of some of the TCP/IP congestion control algorithms implemented in ns2 is done. Then the performance of these algorithms in a TCP/IP Network is studied. A Dumbbell topology with 9 source nodes each operates with a different congestion control algorithm is simulated using ns2. Using this topology, the performance of these algorithms is compared by evaluating their total throughput and bandwidth sharing of the bottleneck link. This comparison results into the suggestion of the algorithm TCP/Reno for improving the efficiency of the e-learning application, as it provides the maximum long term total throughput of all the algorithms.
In this study, alloying and coating effects of active metals (Ti, Zr and Hf) alloyed with Sn were investigated on reactive wetting of Al2O3 at 1273K. To investigate the effect of alloying, Sn-6wt.%Ti, Sn-6wt.%Zr and Sn-6wt.% Hf alloys were prepared for sessile drop tests on polished Al2O3. Average contact angles measured were 68o, 60o and 68.5o, respectively. For the effect of coating, Al2O3 substrates were coated with TiO2, ZrO2 and HfO2, and sessile drop tests were done with pure Sn. Average contact angles measured were 36o, 28 o and 34.7o, respectively. In both cases, polished and coated (with TiO2, ZrO2 or HfO2) Al2O3 substrates, the measured contact angles were equal to or lower than 70o. Substrates were effectively wetted by Sn alloyed with active metals (Ti, Zr, Hf) as well as pure molten Sn. XRD, DTA, metallography techniques and SEM were used to characterize the braze alloys and cross sections of the wetted substrates. XRD results for wetted substrate cross-sections revealed the intermetallics TiAl3, ZrAl, and HfAl as reaction products. The most important result stemming from this work is that a reaction between active metal components and the substrate does not necessarily lead to lower contact angles.
A high resolution modified covariance method is applied to modeling an ultrasonic holographic imaging of concealed objects. In-line holography is used to increase the signal to noise ratio. Different concealing materials are used. The results are compared with the traditional, Fourier transform, method. The performance is investigated for different values of signal to noise ratio.
The deterioration of currents and voltages in electrical networks is due to the presence of non-linear loads (rectifiers, variable speed transmissions, lighting etc) absorbing non sinusoidal currents. These harmonic current circulate in the electrical network, disturb the correct operation of the components and can even generate their destruction. So the reduction of harmonic component becomes essential. In this paper, harmonic reduction using PI and fuzzy logic control has been proposed for a AC-DC converter. The proposed control logic is simulated using MATLAB/SIMULINK and the results are compared.
Systematic knowledge accumulation regarding casting process is essential in order to obtain optimal process conditions. A number of factors define the metallurgical structure in castings of which primary importance is secondary dendrite arm spacing. Controlling the rate of solidification can control dendrite structure. The objective of the present paper is to study the influence of casting process parameters like pouring temperature, insulation on riser, chill thickness and chill contact area on the microstructure parameter secondary dendrite arm spacing. A component of material aluminum alloy A356 is used in the present study. Neural networks are widely used in solving complicated mathematical problems whose analytical description is very difficult and computationally demanding. Design of experiments are used for experimental simulations using finite difference method. The developed neural network models are trained using the response obtained from solidification simulation. The predicted secondary dendrite arm spacing values from neural network are found to be in reasonable agreement with the simulation results and the effect of varied input values on output response is also obtained through sensitivity analysis.
This paper mainly deals with the software implementation of the quaternion filter algorithms and calibration algorithms for the sensors. Rigid body orientation may be determined without the aid of a generated source using a nine-axis Magnetic field, Angular Rate, and Gravity sensor containing three orthogonally mounted rate sensors, linear accelerometers and magnetometers. It describes a system designed to determine the posture of an articulated body in real-time. In the system the orientation of each segment relative to an Earth-fixed reference frame is individually determined through the use of an attached source less sensor. The orientations are used to set the posture of an articulated body model. Details of the fabrication of a prototype MARG sensor and a human body model designed to accept Earth-fixed reference orientation data are also described. Experimental results demonstrate the effectiveness of the tracking system and verify the correctness of the underlying theory.
This paper examines and analyzes the test results produced from a comprehensive test program designed to study the axial behaviour of reinforced concrete columns subjected to steel corrosion under service loads. Several small size concrete columns with various reinforcement configurations were subjected to accelerated corrosion condition in the laboratory. After a target level of corrosion the column specimens were tested to study the failure mode, load-strain behaviour, crack load and ultimate load. The corrosion level was measured based on the loss in weight of the reinforcement1. Uncorroded columns were used as control samples and tested in parallel with the corroded samples.