Development of Emulation Network Analyzer Tool for Computer Network Planning

This paper describes the development of Emulation Network Analyzer (ENA) for heterogeneous services in campus environment. The purpose of this paper is to inform this ENA able to plan and predict network performance. For this purpose, our ENA development is differ from others system such as application and hardware network analyzer. This study focuses on the design of emulation network analyzer, user interface design, characteristics, model description, implementation and evaluation. This ENA can provide a useful network architectural solutions and optimization of network resources during preparation, proposal and planning phases. Finally, ENA tool is a good emulation analyzer that can be used in small to medium size networks for campus environment purposes with minimum cost

Influence of thermal radiation on unsteady MHD free convection flow of jeffrey fluid over a vertical plate with ramped wall temperature

Influence of thermal radiation on unsteady magnetohydrodynamic (MHD) free convection flow of Jeffrey fluid over a vertical plate with ramped wall temperature is studied. The Laplace transform technique is used to obtain the analytical solutions. Expressions for skin friction and Nusselt number are also obtained. Results of velocity and temperature distributions are shown graphically for embedded parameters such as Jeffrey fluid parameter , Prandtl number P r, Grashof number G r, Hartmann number H a, radiation parameter R d, and dimensionless time τ. It is observed that the amplitude of velocity and temperature profile for isothermal are always higher than ramped wall temperature

Numerical solution of unsteady free convection flow in a second grade fluid

In this paper, the problem of unsteady free convection flow moves along a vertical plate in a second grade fluid is studied. The vertical plate with constant temperature is considered. The dimensional governing equations are transformed into non dimensional equations using appropriate dimensionless variables and solved numerically using Finite Difference Method. Numerical results for velocity and temperature profiles are displayed graphically for viscoelastic parameter, Grashof number and Prandtl number and discussed in details. It is found that, increasing the values of Grashof number and time leads to increase in the velocity profiles. Increasing the values of the Prandtl number and viscoelastic parameter is found to decrease the velocity profile. It is further found that, increasing the values of Prandtl number tends to decrease the thermal boundary layer thickness

Stemming text-based web page classification using machine learning algorithms: a comparison

The research aim is to determine the effect of word-stemming in web pages classification using different machine learning classifiers, namely Naive Bayes (NB), k-Nearest Neighbour (k-NN), Support Vector Machine (SVM) and Multilayer Perceptron (MP). Each classifiers' performance is evaluated in term of accuracy and processing time. This research uses BBC dataset that has five predefined categories. The result demonstrates that classifiers' performance is better without word stemming, whereby all classifiers show higher classification accuracy, with the highest accuracy produced by NB and SVM at 97% for F1 score, while NB takes shorter training time than SVM. With word stemming, the effect on training and classification time is negligible, except on Multilayer Perceptron in which word stemming has effectively reduced the training time

Construction procurement in industrialised building system

The government, through CIDB Malaysia have continuously promoting Industrialised Building System (IBS) to increase the immense efficiency of the building performance structure. However, the level of IBS adoption among the construction players in Malaysia is still low and far from the government expectation. It is evident that most of the IBS projects developments in Malaysia are still conducted by using the conventional procurement method. This creates a number of issues such as reworks, time delay, rising cost, lack of communication and integration problem. Thus, this paper will identify existing procurement process used for IBS projects in Malaysia construction industry. Identifying existing procurement process helps in providing significant elements before creation of a more effective new procurement for IBS projects in Malaysia. Expert interviews was used, whereby 5 (five) interviews sessions were conducted with IBS experts in Malaysia construction industry. Thematic analysis was utilised to analyse the interview result by identifying the existing procurement process adopted in current IBS projects. Findings from expert interviews showed that there are three different procurement process commonly applied in current IBS projects. Result also shown that one of the significant barriers to IBS adoption is the current practice of procurement and team integration. Therefore, a more effective new procurement for IBS projects should be considered and pursued urgently in order to improve IBS implementation in the Malaysian construction industry

Neutron radiation effects on the electrical characteristics of InAs/GaAs quantum dot-in-a-well structures

This paper studies the effects of neutron radiation on the electrical behaviour and leakage current mec hanism of quantum dot-in-a-well (DWELL) semiconductor diodes with fluence ranging from 3 to neutron/cm . After neutron irradiation, the forward bias and reverse bias le akage currents showed significant rise approximately of up to two orders of magnitude which is believed to be attributed to the presence of displacement damage induced traps. The ideality factor of the forward bias leakage current corresponding to all neutron fluenceirradiationswerefoundtobecloseto2,suggestingthatthe forward bias current mechanism is large ly due to trap-assisted generation-recombination (TAGR )ofcarriers.Subsequently,it is also observed that the capacit ances reduced after irradiations which were further shown to be due to th e deep carrier trapping effects and the Neutron Transmutation Doping effects (NTD). From the temperature dependence measurements, it is found that the reverse bias leakage curren tmechanismsoftheirradiated samplesareprimarilyattributedtotwoprocess;TAGRofcarriers with emission from the traps assisted by the Frenkel-Poole (F-P).The traps due to both mechanis ms were derived and shown to increase with neutron fluence

Automatic classification of power quality disturbances: a review

The development of intelligent power quality (PQ) disturbances classification and analysis tools exploited various digital signal-processing techniques to extract important features from the PQ signals. The purpose of this paper is to present a comprehensive review and discussion of the advanced tools for the automatic classification of PQ disturbances. The digital signal-processing tools applied for feature extraction include Fourier-transform, Wavelet-transform, Stockwell-transform etc. For the classification of PQ disturbances, the artificial intelligence techniques such as artificial neural networks, fuzzy logic and support vector machine are reviewed here. A large number of features used as inputs to the classifiers may affect the accuracy rate and requires a large memory space. The optimization techniques have been used in literature for optimal feature selection, which include genetic algorithm, simulated annealing, particle swarm optimization and ant colony optimization. An extensive review provides to the researchers a clear perspective on various techniques of PQ disturbances classification

Development of underwater radiography scanner for reactor-pool experiment at the TRIGA PUSPATI reactor

This paper describes the development of a custom-designed underwater scanner to support the experimental works for characterizing irradiated fuel stored in the TRIGA PUSPATI pool by means of radiography technique. Materials used to build the scanner are aluminum 6061, lead and teflon. Three main units that make up the scanner are rig structure, arm block and collimator. Collimator is designed to control radiation exposure by opening and closing the shutter. The experimental works were conducted underwater at 5-m depth hence water tightness is one of the main design criteria. Radiation in terms of gamma energy is captured by radiography film which after development and processing revealed the image of the radiation impact in terms of pixel and gray value. The film size used is 4in x 8in which was slot in the collimator. To validate the scanner, fuel element containing 8.5 wt% and 12 wt% enriched Uranium 235 were used. It was found that the experimental output is consistent with the fuel type and confirmed that the scanner is viable for fuel characterization study

Understanding the mechanisms of lung mechanical stress

Physical forces affect both the function and phenotype of cells in the lung. Bronchial, alveolar, and other parenchymal cells, as well as fibroblasts and macrophages, are normally subjected to a variety of passive and active mechanical forces associated with lung inflation and vascular perfusion as a result of the dynamic nature of lung function. These forces include changes in stress (force per unit area) or strain (any forced change in length in relation to the initial length) and shear stress (the stress component parallel to a given surface). The responses of cells to mechanical forces are the result of the cell's ability to sense and transduce these stimuli into intracellular signaling pathways able to communicate the information to its interior. This review will focus on the modulation of intracellular pathways by lung mechanical forces and the intercellular signaling. A better understanding of the mechanisms by which lung cells transduce physical forces into biochemical and biological signals is of key importance for identifying targets for the treatment and prevention of physical force-related disorders