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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Digital Contents Society
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Journal DOI :
Digital Contents Society
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Volume & Issues
Volume 6, Issue 4 - Dec 2005
Volume 6, Issue 3 - Sep 2005
Volume 6, Issue 2 - Jun 2005
Volume 6, Issue 1 - Mar 2005
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A Study on the Trend of Digital Watermarking Technology
Kang Min-Shik ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 95~99
Recently it is important to protect the digital contents copyright because the multimedia industry is growing rapidly and the network technology is highly developed. Current digital content protection methods have disadvantage that there is very hardly accessible to the digital contents and also it has a limit that it cannot protect the contents once the encrypted contents decrypt. In order to solve this problem, digital watermarking technology has been introduced. This study presents the trend of digital watermarking technology, especially standardization and the trend of digital watermarking algorithms.
Performance Evaluation of Mobile Across Layer in Next Generation Network
Roh Jae-Sung ; Moon Il-Young ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 101~106
In this paper, performance evaluation of mobile access layer for multiple-input multiple-output (MIMO) MultiCarrier(MC)/CDMA 16 QAM system is considered to mitigate multiple access interference and enhance system channel capacity in Rayleigh wireless fading channel. Traditionally, multi-path is viewed as an undesirable feature of wireless communications. Therefore, diversity and adaptive array schemes are proposed to mitigate its effects. Recently, to increase the spectrum efficiency and the link reliability, MIMO schemes is devised to exploit multi-path in a scattering wireless channel. In particular, the channel capacity of MIMO-MC/CDMA 16 QAM system is evaluated according to Eb/No, Mc, p. From the results, in order to improve the channel capacity, the signals at various elements must be uncorrelated. And if the paths are correlated due to inappropriate spacing or mutual coupling effects, the channel capacity of MIMO-MC/CDMA 16 QAM system becomes substantially smaller.
A Design and Implementation of a Query Interpreter for SQL/MM Part5
Kang Gi-Jun ; Lee Bu-Kwon ; Seo Yeong-Geon ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 107~112
We need a research for representing and processing of multimedia data in database because of increasing the importance and utilization of the data owing to development of internet technology. RDBMS supports only the storing-structure to store multimedia, but the support for data type, representation and query of multimedia is insufficient. To cope with this problem, ISO/IEC standardized SQL multimedia(SQL/MM) for multimedia data. However, ORDBMS supports SQL/MM, but RDBMS does not support it. Therfore, this theis proposes a query interpreter to support SQL/MM in MS-SQL 2000 as one of RDBMS and introduces a image retrieval application using it. The quary interpreter supports the function to convert SQL/MM into SQL, and additionally the function of the image duplication check. The image processing application using a query interpreter can easily be integrated and operated with traditional RDBMS-based system.
Reconstruction Scheme of lost Blocks in Block Coded Images
Yoo Kyeong-Jung ; Lee Bu-Kwon ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 113~118
In this paper, the reconstruction scheme of lost block in the transmission of block coded image is proposed. Due to differential coding of dc coefficient in JPEG images when JPEG image are transmitted over wireless communications, the effect of errors can destroy entire blocks of the image. Therefore, we aim to reconstruct the lost information using correlation between the lost block and its neighbor blocks. In order to evaluate the performance of this scheme, we inserted some intentional block error into the test images. And we obtained good results objectively and subjectively by experiments.
A Property Analysis of Parameters for Effective Watermarking based on Human Visual System
Park Ki-Hong ; Yoon Byung-Min ; Kim YoonHo ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 119~123
We proposed a method of effective watermarking based m HVS. To speak generally, HVS parameters are contrast sensitivity, texture degree, entropy sensitivity and standard of deviation, etc. The aim of this paper is evaluated by the experiments of imperceptibility and correctness of watermark. According to some experimental results, contrast sensitivity function is superior in smooth image. On the other hand, standard of deviation provides good results in rough images. Consequently, how to select the parameters considering image attribute is key problem in effective watermarking.
A study on E-Learning system Adaptability Improvement of College Education
Lee Dae-Hoon ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 125~130
In this paper, we analyzed e-learning system and educations based on them which are carried out at some universities, currently. Also the study on the improvement of adaptability to e-learning system is introduced.
A Study on Evolution Strategy of the Next Generation Mobile Terminals
Bang Kee-Chun ;
Journal of Digital Contents Society, volume 6, issue 2, 2005, Pages 131~135
Nowadays, the demand for the wireless technology has gradually increased to support the services of high speed wired internet and also the interest of a mobile terminal convergence has increased. In the next generation, the mobile terminal could merge with the celluar phone, wireless LAN, portable internet, digital multimedia brodcasting, mobile game and sensor(smart-tag and biometrics) through the unified single user interface. Moreover, the system is supported to multi-mode at difference networks, which have variable functions and high performance for available service. Inthis paper, we investigate the minimum requirements and the core technologies of the next generation mobile terminals.