Welcome to Journal of Theoretical and Applied Information Technology

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In a mobile environment, maintaining cache consistency is challenging. Applying one type of consistency levels either strict or weak is not suitable all the time, as the consistency requirements mainly depend on the mobile application system and differ from one to another. Also forcing the mobile client to use its cache data for the purpose of reading only limits the functionality of the caching. The stateful scheme Multi-level Mobile Cache Consistency Protocol that works in client-server architecture supports different levels of consistency. The Mobile client is able to issue updates transactions, and determine the consistency requirements upon its interest. Based on the Multi-Level Mobile Cache Consistency Protocol this paper presents a framework of stateful strategy; Application Based Multi-level Mobile Cache Consistency Method (ABMMCCM) that preserves the advantages of multi-level mobile cache consistency protocol and enhances its drawbacks. In ABMMCCM the consistency requirements are designed at the server side based on the application requirements, and each data item has a single consistency requirement entry. The proposed framework is initially compared to Multi-level Mobile Cache Consistency Protocol, and it appears that ABMMCCM reduces the number of messages transfer between the base server and the mobile client, which helps in better utilizing the wireless network, and reduces the overhead from the mobile client and the base server.

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Application of SMS advertising for enhancing communication with the consumers has drawn significant attention of the contemporary researchers. This study examines whether SMS advertising can be an effective medium of advertising in Bangladesh. The key ingredient of this research is the perception of consumers regarding the adoption SMS advertising. Qualitative and quantitative data derived from field interviews with prospective customers of different business has been used to identify potential relationships among the impact of SMS advertising adoption in Bangladesh and the perception of the respondents. With insight from the interviews, hypotheses has been derived and tested with quantitative data gathered via a direct survey instrument with 160 business stakeholders who has the potentiality to get influenced directly in if the system can be established across four divisions of Bangladesh. The propositions presented in this study provide preliminary evidence that consumers has shown positive attitude in accepting SMS ads via their mobile phones. The study will contribute significantly regarding the policy making of both the business professionals as well as advertising professionals in selecting and establishing the proper advertising methods as well as medium in future for operating in the best possible way in the country. Future researches on this particular field may require to look at issues like cultural factors of the concerned communities and global phenomenon.

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In the course of carrying out its mission the primary challenge facing e-gov is how to deliver secure online services to businesses and citizens. For this paper, the Virtual Private Network (VPN) will be the solution selected to deal with this challenge. VPN can resolve these issues by simplifying and speeding the delivery of on-line services and information to citizens, businesses, and inter-agencies safely and securely. The following paper is organized into seven sections: I) a brief introduction to e-gov; II) security and privacy of e-gov; III) Real World Case: Ontario, Canada; IV) VPN Technology and Network Security Protocols (VPN tunneling and VPN tunneling protocols through a look at their capabilities, advantages, and disadvantages); V) VPN Authentication, to include two-party and trusted third-party authentication and their capabilities, merits, and limitations; and VI) conclusion.

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This paper presents the evaluation of mental stress measurement using heart rate variability. The heart rate signals are processed first using Fourier transform, then it is applied to wavelet transform. The activity of the autonomic nervous system is noninvasively studied by means of autoregressive (AR) frequency analysis of the heart-rate variability (HRV) signal. Some methods of noise rejection and robustness for AR recursive identification are presented that make on-line frequency analysis of the heart-rate variability signal more reliable. The goodness of the algorithms is first tested through simulations, and then results obtained on real data during ischemic episodes are presented. Spectral decomposition of the Heart Rate Variability during whole night recordings was obtained, in order to assess the characteristic fluctuations in the heart rate and their spectral parameters during REM and NREM sleep stages. Mental stress is accompanied by dynamic changes in autonomic nervous system (ANS) activity. Heart rate variability(HRV) analysis is a popular tool for assessing the activities of autonomic nervous system. This paper presents a novel method of HRV analysis for mental stress assessment using fuzzy clustering and robust identification techniques. The approach consists of 1)online monitoring of heart rate signals, 2) signal processing (e.g.,using the continuous wavelet transform to extract the local features of HRV in time-frequency domain)

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Medical information systems evolve constantly. Homecare is a part of these systems. Nowadays, the organization of homecare arouses an increasing interest. By organization, we mean particularly the choice of partners, distribution problems, tasks coordination, and the resolution of all participants’ resources-conflicts that implies a reliable communication. The quality of the homecare relies on competences, qualifications, and the organization of the participating partners. So, it is necessary to assure a permanent interaction. It is evident that the agent paradigm is the most suitable one for modeling the homecare organization since it is capable of taking into account all its properties (heterogeneity, distribution, decision making, etc.). In this paper we would like to present interactions in an agent-based architecture for a cooperative information system that supports the homecare and contains all the necessary constituents for its functioning.

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OFDM is a promising wireless transmission technique for high speed data transmissions. The potential benefits and obstacles are presented. The effects of fading, frequency offset, and channel estimation error are analyzed both mathematically and through computer simulations.

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The large sizes of existing databases are rapidly increasing with time. In this environment, there is a need to help users, who are usually not familiar with SQL statements and the schema of a database, in getting the information sorted according to their relevancy. In response to this need, many researchers have introduced the capability of querying a database based on a list of keywords. A user does not have to state a full SQL query, but just provide the list of keywords that seem to be of interest. The system would then return the relevant records from different tables that appear to be close to what the user is looking for, based on the list of keywords that he/she provides. However, there is a need to improve the efficiency and effectiveness of existing systems. In this paper, we introduce a framework for processing keywords-based queries that improves the efficiency and effectiveness. In addition, the performance results are presented.

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In recent years, as a result of advancing VLSI technology, OFDM has received a great deal of attention and been adopted in many new generation wideband data communication systems such as IEEE 802.11a, HiPerLAN/2,digital audio/video broadcasting (DAB/DVB-T) and asymmetric digital subscriber line (ADSL), very high speed digital subscriber line (VDSL) in wireless and wired communications, respectively. In these communication systems the different applications mentioned above have different demands in operation speed and length of FFT/IFFT. The modified Mixed Radix 8-2 Butterfly FFT with bit reversal for the output sequence derived by index decomposition technique is our proposed VLSI system architecture to design the prototype FFT/IFFT processor for OFDM systems.

In this paper the analysis of several FFT algorithms such as radix-2, radix-4, split radix and mixed radix 4-2 and proposed mixed radix8-2 were designed using VHDL and outputs are analysed. Mainly
the results show that the proposed processor architecture can save the area approximately 5% and power more than 40% when compared to basic radix 2 system, which may be attractive for many real-time systems. Reduction in area and power can further leads to less implementation cost. Also the proposed algorithm makes an offer the simple bit reversal mechanism which is only supported by a fixed radix FFT algorithm.