Welcome to Journal of Theoretical and Applied Information Technology

DOUBLE COMPRESSION OF TEST DATA USING HUFFMAN CODE

R.S.AARTHI, D. MURALIDHARAN, P. SWAMINATHAN

Journal of Theoretical and Applied Information Technology              pp 104 - 113    Vol 39. No. 2 -- 2012

Increase in design complexity and fabrication technology results in high test data volume. As test size increases memory capacity also increases, which becomes the major difficulty in testing System-on-Chip (SoC). To reduce the test data volume, several compression techniques have been proposed. Code based schemes is one among those compression techniques. Run length coding is one of the most popular coding methodology in code based compression. Run length codes like Golomb code, Frequency directed run Length Code (FDR code), Extended FDR, Modified FDR, Shifted Alternate FDR and OLEL coding compress the test data and the compression ratio increases drastically. For further reduction of test data, double compression technique is proposed using Huffman code. Compression ratio using Double compression technique is presented and compared with the compression ratio obtained by other Run length codes.

Test Data Compression, Run Length Codes, Golomb Code, OLEL Code, Huffman Code

 Full Text

CLOUD COMPUTING SOLUTION - BENEFITS AND TESTING CHALLENGES

PRAKASH.V, GOPALAKRISHANAN.S

Journal of Theoretical and Applied Information Technology              pp 114 - 118    Vol 39. No. 2 -- 2012

Modern day Software companies needs fast, secure and scalable IT infrastructure, in order to catch up with their ever growing needs of business. But, the challenge lies in setting up this setup in their own premise. They have to spend huge amount of money towards the growing needs of the IT infrastructure, personnel and the expertise to administer. As a result the focus will be shifted from their core business towards handling this burden. Here comes the Cloud computing, a solution which helps organizations to focus on their core business rather than worrying about the investment and maintenance of their IT infrastructure. This paper focuses on the challenges faced by companies in moving to a cloud environment, with respect to security, reliability, and manageability, which the organizations should focus on only through rigorous testing. The paper starts explaining the benefits of cloud computing and move towards the testing challenges faced by testers

Testing, Cloud Testing, Cloud Testing Challenges

 Full Text

A PARALLEL APPROACH FOR IMPROVING DATA SECURITY

KARTHIKEYAN.S, SAIRAM.N, MANIKANDAN.G, SIVAGURU.J

Journal of Theoretical and Applied Information Technology              pp 119 - 125    Vol 39. No. 2 -- 2012

In today’s world internet is being used by almost everyone. Numerous file exchanges take place online including many official documents. These files require some sort of security mechanisms while being transmitted over the internet. Cryptography is one such means by which a person can encrypt the data and send it through the internet. This way the data is safe and unreadable for the intruders. In this paper we have proposed a system which combines the advantages of parallel processing and cryptographic algorithms. The use of parallel processing enhances the speed of system when compared to the traditional crypto systems. In our approach we have divided a file into two slices and have applied a single algorithm with different key for each slice and the processing of the algorithm is done in a parallel environment. From our experiments we found out that the execution time of a cryptographic algorithm is considerably reduced in a parallel environment when compared to the generic sequential methods.

Cryptography, Parallel Processing, File Security, Symmetric-Key.

 Full Text

SURVEY ON VARIOUS UI DESIGN APPROACHES

SATHYA S, SIVARANJANI A, SANTHI B

Journal of Theoretical and Applied Information Technology              pp 126 - 131    Vol 39. No. 2 -- 2012

User Interface (UI) is the prime factor that decides the usability of any products. Nowadays the developer must direct their effort towards the development of UI that function effortlessly. The research in UI design has gained a high attraction due to importance of interactive application and to enhance the user experience. Tremendous approaches are there to design effective UI. Each design approaches have their own special design aspects. In this paper an attempt has been made to review the research studies on various design approaches in the field of UI Design.

User Interface (UI), User Experience, UI Design, Design Approaches

 Full Text

A MODIFIED HYBRID PARTICLE SWARM OPTIMIZATION ALGORITHM FOR SOLVING THE TRAVELING SALESMEN PROBLEM

SAID LABED , AMIRA GHERBOUDJ , SALIM CHIKHI

Journal of Theoretical and Applied Information Technology              pp 132 - 138    Vol 39. No. 2 -- 2012

The traveling salesman problem (TSP) is a well-known NP-hard combinatorial optimization problem. The problem is easy to state, but hard to solve. Many real-world problems can be formulated as instances of the TSP, for example, computer wiring, vehicle routing, crystallography, robot control, drilling of printed circuit boards and chronological sequencing. In this paper, we present a modified hybrid Particle Swarm Optimization (MHPSO) algorithm in which we combine some principles of Particle Swarm Optimization (PSO), the Crossover operation of the Genetic Algorithm and 2-opt improvement heuristic. The main feature of our approach is that it allows avoiding a major problem of metaheuristics: the parameters setting. In the aim to prove the performance and convergence of the proposed algorithm, we have used it to solve some TSP instances taken from TSPLIB library. Moreover, we have compared our results with those obtained by other algorithms based PSO.

Traveling Salesman Problem, Particle Swarm Optimization, Optimization, Meta-heuristics

 Full Text

FPGA BASED 3D MOTION SENSOR

Y.NANDHINI, Asst.Prof. D. MURALIDHARAN

Journal of Theoretical and Applied Information Technology              pp 139 - 144    Vol 39. No. 2 -- 2012

The main objective of this paper is to explain the functioning of a device, designed to sense the real time motion changes of an object. This motion sensing device Digital Accelerometer can be used to sense any change in the position of an object with respect to its original position, all along the three axes. This Digital accelerometer is to be put into its function controlled by a Field Programmable Gate Array (FPGA). The above motion sensing device connected with the FPGA will also be useful in reducing complexity factors such as area consumption, cost, etc in installing the objects and at the same time, the device could also be introduced in an easier way. This paper is mainly to deal with the experimental procedure in detecting such changes using this motion sensing device Digital Accelerometer

Digital Accelerometer, Field Programmable Gate Array, MicroBlaze Processor, Spartan6

 Full Text

PASSWORD BASED TWO SERVER AUTHENTICATION SYSTEM

VIGNESH KUMAR K, ANGULAKSHMI T, MANIVANNAN D, SEETHALAKSHMI R, SWAMINATHAN P

Journal of Theoretical and Applied Information Technology              pp 145 - 149    Vol 39. No. 2 -- 2012

User Authentication in computer systems is an important cornerstone in today’s computer era. The concept of a user id and password is one of the easiest ways for authentication. It is not only the easiest way, but also cost effective and highly efficient. Today, we can see the password cracking and hacking in everywhere. At present we are using the single server system for this sort of password based authentication. Traditional protocols for password-based authentication assume a single server which stores all the information (e.g., the password) necessary to authenticate a user. When an attacker obtains the information stored on the server, he can obtain all the passwords which were stored in the server via launching an off-line dictionary attack. To address this issue, a number of schemes have been proposed in which a user’s password information is shared among multiple servers, and these servers cooperate in a threshold manner the user wants to authenticate. In this paper, a new efficient two-server password-only based authentication is proposed. In addition, the system is secure against offline dictionary attacks mounted by either of the two servers.

Password Authentication, Two Server Concept, Offline and Online Dictionary Attack

 Full Text

THE USAGE OF CAPABILITY MATURITY MODEL INTEGRATION AND WEB ENGINEERING PRACTICES IN LARGE WEB DEVELOPMENT ENTERPRISES: AN EMPIRICAL STUDY IN JORDAN

OMAIMA N. A. AL-ALLAF

Journal of Theoretical and Applied Information Technology              pp 150 - 166    Vol 39. No. 2 -- 2012

There is a lack of surveys in large web development enterprises to determine: the level of adoption of web engineering practices and capability maturity model integration (CMMI) in these enterprises. Therefore, we need a survey in large enterprises to improve their web development processes and overcome their problems during the development process. We focus in this research on answering four questions: What are the characteristics of developers working in large enterprises? What are the properties of web development processes adopted by large enterprises? What are the symptoms that large enterprises face during web development? And finally, what are levels of usage of CMMI and web engineering practices by these enterprises. A survey has been conducted in this research based on questionnaires in large enterprises in Jordan to answer the above questions. According to survey results, we noticed that: two of web engineering practices such as tools and technology, and standards and procedures are partially adopted, whereas organizational issues, web metrics, and control of development process are barely used by these enterprises. We also noticed that the majority of the respondents have not previously participated in CMMI activities. Finally, recommendations are provided to improve web development processes and overcome identified problems in these enterprises.

Large web applications, web engineering, web engineering practices, Capability Maturity Model Integration (CMMI), software process improvement (SPI), Quality Assurance (QA).

 Full Text

SOFTWARE AGENTS PARADIGM IN AUTOMATED DATA MINING FOR BETTER VISUALIZATION USING INTELLIGENT AGENTS

R. JAYABRABU,  Dr. V. SARAVANAN,  Prof. K. VIVEKANANDAN

Journal of Theoretical and Applied Information Technology              pp 167 - 177    Vol 39. No. 2 -- 2012

Data Mining techniques plays a vital role like extraction of required knowledge, finding useful information to make strategic decision in a novel way which in term understandable by domain experts. Users like expert user, novice user and connoisseur user in which expert user can complete process on its own knowledge while compared to novice user and connoisseur user because of their less domain knowledge. The inadequate lead to grow user like novice and connoisseur user more. With these properties they are not at all more significant users like expert users. By considering these aspects agents are implemented to perform the specified task on behalf of less domain user in which selection of appropriate mining techniques, appropriate algorithms, and proper decision making for producing better results. In these paper, multiple agents are considered to perform differ unique task with proper communication and collaboration with each agents in the name of automated process for better visualization and cluster detection for less domain users.

Data Mining Techniques, Multi –Agent Systems, Agents Role, Visualization

 Full Text

INTELLIGENT FAULT DETECTING SYSTEM IN AN OPTICAL FIBRE

G.BASKARAN,  R.SEETHALAKSHMI

Journal of Theoretical and Applied Information Technology              pp 178 - 187    Vol 39. No. 2 -- 2012

In this intelligent fault detecting system in an optical fibre used to find the fault in optic fibre line. To design a fault monitoring module and find the fault in the line says across the customer sides. The idea behind this module is to monitor the received power supply in optical fibre using a Microcontroller. Laser output power monitoring circuit is designed using ISIS simulator to monitor the received power supply in the optical fibre. If there is any abrupt changes in power of optical line the automatic message will be transmitted to monitoring person regarding the fault in fibre via of GSM. Here we can operate Microcontroller in low power mode (sleep mode) to save power consumption. Automatic message is transmitted to monitoring person about the fault in optical line.

Optical fibre, Microcontroller, Global System for Mobile Communication (GSM).

 Full Text

SIMULATION VOICE RECOGNITION SYSTEM FOR CONTROLING ROBOTIC APPLICATIONS

WAHYU KUSUMA R., PRINCE BRAVE GUHYAPATI V

Journal of Theoretical and Applied Information Technology              pp 188 - 196    Vol 39. No. 2 -- 2012

Voice recognition is a system to convert spoken words in well-known languages into written languages or translated as commands for machines, depending on the purpose. The input for that system is "voice", where the system identifies spoken word(s) and the result of the process is written text on the screen or a movement from machine's mechanical parts.
This research focused on analysis of matching process to give a command for multipurpose machine such as a robot with Linear Predictive Coding (LPC) and Hidden Markov Model (HMM), where LPC is a method to analyze voice signals by giving characteristics into LPC coefficients. In the other hand, HMM is a form of signal modeling where voice signals are analyzed to find maximum probability and recognize words given by a new input based from the defined codebook.
This process could recognize five basic movement of a robot: "forward", "reverse", "left", "right" and "stop" in the desired language. The analysis will be done by designing the recognition system based from LPC extraction, codebook model and HMM training process. The aim of the system is to find accuracy value of the recognition system built to recognize commands even the speaker voice isn't currently stored in the database.

Voice Recognition, Robot, LPC, HMM

 Full Text

SELF-ORGANIZED BEHAVIOR BASED MOBILITY MODELS FOR AD HOC NETWORKS

A. MADANI AND N. MOUSSA

Journal of Theoretical and Applied Information Technology              pp 197 - 203    Vol 39. No. 2 -- 2012

Among the aspects that require a major interest in the simulation of mobile ad hoc networks (MANETs) is the mobility of nodes in the network. Several mobility models have been proposed. In this paper, we study the impact of self-organized behavior based models on the mobility of nodes in the network, through two models, namely: Flock Mobility model and Leadership mobility Model. The results are then compared to those provided by the Random Walk Mobility model. The analysis points to the relationship between two important and interdependent concepts: mobility of nodes in the network and communication/interference between nodes.

Self-Organized Behavior, Mobility Models, Cellular Automata, Interference/Communication Between Nodes

 Full Text

NONLINEAR CONTROL OF MPPT AND GRID CONNECTED FOR VARIABLE SPEED WIND ENERGY CONVERSION SYSTEM BASED ON THE PMSG

Y.ERRAMI, M.HILAL, M.BENCHAGRA, M.OUASSAID, M.MAAROUFI

Journal of Theoretical and Applied Information Technology              pp 204 - 217    Vol 39. No. 2 -- 2012

The efficiency of the variable speed wind energy conversion systems (WECS) can be greatly improved using an appropriate control strategy. In this paper, nonlinear control for wind energy conversion system (WECS) based on the permanent magnet synchronous generator (PMSG) is investigated in order to maximize the generated power from wind turbine. The control strategy combines the technique of maximum power point tracking (MPPT) method and sliding mode (SM) nonlinear control theory, that as it is well known, presents a good performance under system uncertainties. The block diagram of the WECS with a back-to-back PWM converter structure and PMSG is established with the dq frame of axes. Considering the variation of wind speed, both converters used the sliding mode control scheme. The objectives of grid-side converter are to deliver the energy from the PMSG side to the utility grid, to regulate the DC-link voltage and to achieve unity power factor and low distortion currents, while a speed controller is designed to maximize the extracted energy from the wind, below the rated power area. Simulation results show the feasibility and robustness of the proposed control schemes for PMSG based variable speed wind energy conversion systems.

Lyapunov Theory, Sliding Mode Control, WECS, PMSG, MPPT, Unity Power Factor.

 Full Text

SIGNALS, ANIMAL RESPONSE AND EARTHQUAKE

MUHAMMED SACUAR HUSSAIN, SYED MD. ASIF

Journal of Theoretical and Applied Information Technology              pp 218 - 224    Vol 39. No. 2 -- 2012

Most of the modern researches on animal behavior dates back to the mid seventies. There is no significant design or method for understanding “animal behaviour for earthquake prediction”, though international researches have been carried out especially in China, Japan and USA. These researches mainly rely on particular animal behaviour changes due to several simulated earthquake environment and based on previous earthquake statistics. However, animal produces numeral behaviours, and it is ambiguous to rely on particular behaviour rather than elaborate system. This paper aims to describe the circular model of energy flow during earthquake, similar to a damping oscillator. The energy flow is compared to a power inverse law .The energy spread at long distances are linked to animal sensitivity level. Animal signals are produced in the form of acoustic, chemical, electromagnetic signals. These signals are important in applying for recognition of nearby calamities such as earthquake. Then methods of data collection for such parameters are emphasized along with the reason for targeting a group of species as reference - rather than many. Animals are sensitive to weak signals which are often unnoticed even by the subtle instruments and measuring techniques. So a method for earthquake prediction based on signal variations in nature and animal responses is proposed. The explicit reason for animal based prediction model is explained in terms of biological and physical factors. The data collection and processing method is an integrated model of different types of signal analysing techniques. An integrated processing method increases efficiency of the system through comparison and mathematical analysis. Animals react to environmental changes and their reaction accompanies different behaviour changes. This response to stimuli involves pheromone secretions and homoeostasis rate variations. An earthquake induces such changes to highly sensitive species. An integrated analyser can be used to detect pheromone level along with other environmental variations to forecast a nearby disaster.

Animal reactions, Bessel function of first kind, Kleiber’s law, Earthquake, Signals

 Full Text

A REVIEW OF AUTOMATED DIABETIC RETINOPATHY DIAGNOSIS FROM FUNDUS IMAGE

K.NARASIMHAN, NEHA.V.C, K.VJAYAREKHA

Journal of Theoretical and Applied Information Technology              pp 225 - 238    Vol 39. No. 2 -- 2012

A fundus camera provides digitised data in the form of a fundus image that can be effectively used for the computerised automated detection of diabetic retinopathy. A completely automated screening system for the disease can largely reduces the burden of the specialist and saves cost. Noise and other disturbances that occur during image acquisition may lead to false detection of the disease and this is overcome by various image processing techniques. Following this different features are extracted which serves as the guideline to identify and grade the severity of the disease. Based on the extracted features classification of the retinal image as normal or abnormal is brought about. In literature various techniques for feature extraction and different types of classifiers have been used to improve sensitivity and specificity. FROC analysis and confusion matrix are used to evaluate the system performance. In this paper critical analysis of various algorithms and classifiers is done that have been used for the automated diagnosis.

Diabetic Retinopathy, Fundus Image, Classifier, Sensitivity, Specificity

 Full Text