Welcome to Journal of Theoretical and Applied Information Technology

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Unified communications encompasses a broad range of technologies and many potential applications. With unified communications, subscribers reduce the number of places they must check for incoming voice, fax, e-mail messages, and other media types. From a single interface, they can check for all messages. Unified communications encompasses all forms of call and multimedia/cross-media message-management functions controlled by an individual user for both business and social purposes. This includes any enterprise informational or transactional application process that emulates a human user and uses a single, content-independent personal messaging channel (mailbox) for contact access.

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XML is a universal, platform independent language that describes the way, information can be stored, transferred and exchanged electronically. Any user on internet can access these XML documents & manipulate the information contents. Security is the prime concern in XML documents. Different security measures can be employed to ensure the integrity & confidentiality of XML data. Information hiding can be applied in XML documents which constitutes towards the field of steganography. Steganography is the art and science of hiding information by embedding messages within other messages so that unauthorized users can not access the information. This paper provides a new horizon for safe communication through XML on Internet. XML steganography is a solution which makes it possible to send news and information without being altered and without the fear of the messages being intercepted and traced back to sender. Different steganographic techniques have been designed which ensures that the integrity and confidentiality of data is maintained in XML documents. XML files can be secured by applying these techniques separately or by combining them.

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In the paper, a novel HVDC transmission system operating with weak ac system has been modeled with speed and precision & analyses the control strategy & performance of system, which is controlled using fuzzy. The system can feed a weak or even dead network under fluctuations and big variations of the input power. The fuzzy logic-based control of the system helps to optimize the efficiency of the link under various disturbances. This model provides the basic building blocks found in a typical HVDC system that can be used to build models for individual users own models. The specific contributions, in this paper are that a DQ- type of phase-locked-loop for synchronizing the firing pulses to the HVDC converter has been presented. This gate-firing unit is capable of a providing a clean sinusoidal synchronizing voltage from a polluted and harmonic distorted commutation voltage. The simulations based on PSCAD/EMTDC show that proposed fuzzy logic based HVDC system can operate steadily, has the capability to restore steadily when short circuit fault occurs, and obvious in advantages.

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Spatial objects of our world have an intrinsic three-dimensional (3D) nature; 3D data modeling and 3D data management have been neglected in spatial database systems and Geographical Information Systems, which map geometric data mainly to two-dimensional abstractions. But increasingly the third dimension becomes more and more relevant for application domain like pollution control, water supply, soil engineering, urban planning and aviation.
Spatial-DBMSs were chosen to store spatial data, because they could guarantee the safety of the data (in 2D). But with the arrival of applications depending upon correct 3D data, the present techniques do not suffice. The solution for this problem is to implement a real 3D primitive, including functions that e.g. return the volume or the distance between objects in 3D and validation functions. This improves the maintainability of 3D Spatial-datasets .3D Spatial objects are stored with the polyhedron as (3D) primitive. The proposed primitive is easy for users to model objects, can easily validated, because the algorithms are not too difficult to implement and still result in realistic objects.

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This paper presents a new methodology using fuzzy and Real Coded Genetic Algorithm (RCGA) for the placement of capacitors on the primary feeders of the radial distribution systems to reduce the power losses and to improve the voltage profile. A two-stage methodology is used for the optimal capacitor placement problem. In the first stage, fuzzy approach is used to find the optimal capacitor locations and in the second stage, Real Coded Genetic Algorithm is used to find the sizes of the capacitors. The sizes of the capacitors corresponding to maximum annual savings are determined. The proposed method is tested on 15-bus, 34-bus and 69-bus test systems and the results are presented.

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The paper describes the performance analysis and of design piezoresistive pressure sensorusing simulation technique. The piequ resistors are arranged in the wheat stone bridge configuration to achieve higher voltage sensitivity and low temp sensitivity The MFMS has been designed and simulated using MATLAB.This paper also discuses the simulations and the response from the MEMS.

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Establishing hidden communication and conveying information secretly has been of interest since long past ago. One of the methods introduced for establishing hidden communication is steganography. Methods of steganography have been mostly applied on images, audios, videos and text  while the major characteristic of these methods are to change in the structure and features so as not to be identifiable by human users. Text documents have been widely used since very long time ago. Therefore, different methods of hiding information in texts (text steganography) are witnessed from the past to the present. In this paper a new approach for steganography in Arabic and Urdu texts is introduced. Considering the existence of harakaat/Araabs i.e. Fatha, Kasra, and Damma in Arabic and Urdu phrases, in this approach, by using Reverse Fatha, information is hidden in the texts. This approach can be categorized under feature coding methods. This method can be used for Arabic/Urdu Watermarking.

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Power transformers represent the largest portion of capital investment in transmission and distribution substations. In addition, power transformer outages have a considerable economic impact on the operation of an electrical network. One of the most important parameters’ governing a transformer’s life expectancy is the hot-spot temperature value. Due to under estimation of stray losses in power transformer hot spots are formed. So the stray loss evaluation is an essential aspect to calculate hot spot temperature. The stray losses in transformer is caused by the time variable leakage flux which induces emf’s & circulates eddy currents in the winding conductors and other conducting parts of transformer like tank wall, core, clamps etc.. Evaluation of stray losses can be done more accurately by Finite Element Method (FEM). This paper presents the new and more accurate temperature calculation methods taking into account the above mentioned findings to estimate life of transformer form hot spot temperature.

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Business related IS / IT innovation is changing very rapidly. There are so many new technologies introduced by the academic and practitioner community that the business community is very puzzled and it is very difficult for them to decide, which one to accept and which one to reject. We think that SOA architectural design has all the characteristics which the business community desires for long. We also think that SOA is a solution which can align the technology with business objectives. Adopting SOA, can bring uniformity in IS / IT department which can also lead to enhanced outsourcing.