International Journal of Computer Techniques

1-7

Authors: - IJCTEndang Rini Sukamti, Siswantoyo,Herlambang Sigit P,Sb. Pranatahadi, Guntur

This research aims to be able to make modifications to development tools back and leg dynamometer. Specific targets to be achieved in this research is the creation of modification tools back and leg dynamometer that can be used in accordance with current needs, where the back and leg dynamometer are currently only able to with stand the load resistance of up to 300kg, in fact in the last 2 years many athletes who have had the capability of more than 300 kg, thus the need for modifications to the development of back and leg dynamometer load is up to 400kg resistance. The study design of this research is the R & D (Research and Development). This research subjects was conducted in yogyakarta state university. The results of first years has been the completion of a prototype tool leg and back dynamometer innovative. In the 2nd year study shows that it has completed a prototype of a modified development tool back and leg dynamometer with capability of 400 kg. Created tools has advantages among others: the ability of measurement exceeds appliance standard (300 kg), has the ability to store data in memory on the tool developed, the framework materials using aluminum so it is not easy to rust, can be used indoors and outdoors (portable), display data with larger numbers and a strong light with LED Display, low energy. Product test results found that of the 280 athletes who followed the trial of the product in the form of test and measurement leg muscle strength are 14 athletes were found to have strength above 300 kg. Results of ultimate power reached 386 kg of wrestling athlets and track and filed up to 354 kg. From these results, it was concluded that the back and leg modification tool used to measure decent back and leg muscle strength with strength up to 400 kg.

1-11

Authors: - IJCTC.N.Sujatha , Dr. P. Satyanarayana

Watermarking with unaffected detection and high robustness capabilities is still a challenging problem. The success of a digital watermarking technology depends greatly on its robustness to withstand attacks which are aimed at removing or destroying the watermark from its host data. This paper provides analysis of a number of digital watermark attacks and the experimental results are provided to show the effect of these attacks on watermarks using hybrid video watermarking technique based on DWT, DCT and SVD. The main idea of this paper is to develop an algorithm which can be robust to various attacks, that embeds the watermark information without much distortion to the host video by modifying the frequency coefficients of the frames, while making it possible to extract the watermark by using the inverse algorithm. Based on human visual systems perception of video content, which is used to embed a watermark such that its amplitude is kept below the distortion sensitivity of the pixel and thus preserving the video quality. The operation of embedding and extraction of the watermark is done in frequency domain, and it is checked for different signal processing, geometric and noise attacks. This paper has conducted a comprehensive research with special emphasis on the malicious attacks against digital watermarking

1-10

Authors: - IJCTYaolongShi ,QingqingGan

In the outsourcing spatial database mode,data owner entrust query operations to a third party data server. Due to the third party data server could be affected by external attack or existence of its own insecurity,it is very important to establish an effective mechanism to verify the query results. This paper proposes a new query authentication method based on Apriori algorithm,which will return to the user all the associated results satisfied the query conditions. According to the characteristics of the query,we proposed a new authentication data structure named VMR-Tree. What’s more, we take the tailoring strategy on the results and return the user the most influencing result. Thus user through this mechanism can validate the authenticity,effectiveness and integrity of the result. In addition, the analysis of security analysis and performance shows that the proposed scheme is efficient and practical.