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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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Digital Contents Society
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Volume & Issues
Volume 5, Issue 4 - Dec 2004
Volume 5, Issue 3 - Sep 2004
Volume 5, Issue 2 - Jun 2004
Volume 5, Issue 1 - Mar 2004
Selecting the target year
A Blind Signature Scheme for Customer Anonymity in Contents Purchase
Lee Hyun-ju ; Rhee Chung-Sei ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 1~6
Electronic cash is used as a payment tool for contents purchase in mobile electronic commerce environment. In order to protect customer`s privacy, we use blind signature. Blind signature has an anonymity property since it does not allow connection between customer`s ID and customer`s message. In this paper, we propose an blind signature scheme using elliptic curve algorithm based on Cap Diffie-Hellman Problem. Proposed scheme efficiently improved against existing blind signature scheme by reducing communication and computation time of the process.
An Analysis of Data Traffic Considering the Delay and Cell Loss Probability
Lim Seog -Ku ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 7~11
There are many problems that must solve to construct next generation high-speed communication network. Among these, item that must consider basically is characteristics analysis of traffic that nows to network Traffic characteristics of many Internet services that is offered present have shown that network traffic exhibits at a wide range of scals-self-similarity. Self-similarity is expressed by long term dependency, this is contradictory concept with Poisson model that have relativity short term dependency. Therefore, first of all, for design and dimensioning of next generation communication network, traffic model that are reflected burstiness and self-similarity is required. Here self-similarity can be characterized by Hurst parameter. In this paper, the calculation equation is derived considering queueing delay and self-similarity of data traffic art compared with simulation results.
A Study on Building a Virtual Reality System with Environmental Design
Kim, Chi-Young ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 12~21
Modem society is information oriented with countless people needing quick reliable information. They also wart to be freed from the limitations of reality such astime and space and experience the world of imagination as if it was reality. Design is creating something out of nothing which has an innate sense of virtual within it. Since it is a process of bringing an imagingnation or an image to life, it can be described as the realization of virtuality. there are many ways in which computer adapted methods were utilized for design up to now. With the advance of computers, the process of desinging became efficient, visually complex and much easier. Undoubtedly, computer is a powerful hardware an design and furthermore, find a way to maximize the presence and to actively incorporate this in designing. The virtual reality system can be widely applied to environmental design to provude a high quality design and enhance the feeling of reality through imitation experiments. Computer simulation such as virtual reality systems is expected to be used widely in environmental design.
Visualization and Workspace Analysis of Manipulator using the Input Device in Virtual Environment
Kim Sung Hyun ; Song Tae Gil ; Yoon Ji Sup ; Lee Geuk ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 22~27
To handle the high level radioactive materials such a spent fuel, the master-slave manipulaters (MSM) are wide1y used as a remote handling device in nuclear facilities such as the hot cell with sealed and shielded space. In this paper, the Digital Mockup which simulates the remote operation of the Advanced Conditioning Process(ACP) is developed. Also, the workspace and the motion of the slave manipulator, as well as, the remote operation task should be analyzed. The process equipment of ACP and Maintenance/Handling Device are drawn in 3D CAD model using IGRIP. Modeling device of manipulator is assigned with various mobile attributes such as a relative position, kinematics constraints, and a range of mobility. The 3D graphic simulator using the extermal input device of spare ball displays the movement of manipulator. To connect the exterral input device to the graphic simulator, the interface program of external input device with 6 DOF is deigned using the Low Level Tele-operation Interface(LLTI). The experimental result show that the developed simulation system gives much-improved human interface characteristics and shows satisfactory reponse characteristics in terms of synchronization speed. This should be useful for the development of work`s education system in the environment.
Block Error Performance of Orthogonal Multicarrier 16 QAM Signal in a Frequency Selective Rician Fading Environment
Kim Young-Chul ; Kang Duk-Keun ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 28~34
In this paper, we have analyzed the block error probability of orthogonal multicarrier 16 QAM signal in a frequency selective Rician fading environment. The block error probability is evaluated with several parameters such as normalized propagation delay
, bit energy to noise power ratio
and desired signal to undesired signal power ratio (DUR) in fast fading and slow fading channels. In the fast fading channel, The result shows that the block error probability rather in the fast fading channel achieves better performance than in the slow fading channel, when the error correction capability is one or two.
EasyLab : An Avatar Robot for Algorithm Education
Park Young-Mok ; Kim Ho-Yong ; Seo Yeong-Geon ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 35~40
Today`s education is in the 7th education curriculum. But, there is nothing that can be used in the classroom as a tool for education supplement. Easylab is a GUI-programing tool for students who not good at using computers. EasyLab is used in the classroom as a kind of tool to give a rise to ingenuity and creation which need at present education curriculum. When use it, first, learners think of programming-ideas, then program through icon-based software-EasyLab. After programing, the leaner can see the result directly thorough the programing code which are delivered by EasyRobot. So, leaner can study and discuss with the robot`s result. If, the result is incorrect, the robot will do a feedback as a kind of rule. One of the EasyLab`s specific property is that consisted icon-based flow-chart model. And leaner can practice with the robot that have input and output sense.
Messenger connection research for University Supporting
Bang Kee-Chun ; Kim Seok-Soo ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 41~47
The objective of this research is to add convenience to the intranet operating within an educational institution by setting up a messenger function to enable it faculties and teachers to making better use of the university database via Intranet. With this massenger services, users can view the information about the members in a group they belong to, and register as friends a group of members they selected from the work group they are in. This function will reduce the cumbersome chores of adding one individual as a fiend at a time. This research will enhance the Intranet within an educational institution by integrating new functions.
Reduction of the Blocking Artifact in Block-Based Image Coding System
Yoo Kyeong-Jong ; Seo Yeong-Geon ; Lee Bu-Kwon ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 48~53
Due to NxN block coding blocking artifacts are exhibited by block-based DCT coding images, primarily at low bit rates. In this letter, we propose the new technique that reduce the blocking artifacts pixels in such images. In the case of combining with list block reconstruction techniques, our algorithm can be also used to improve image qiality. And, the performance of the proposed algorithm is demonstrated experimentally.
Internet Based Intelligent Survey and Application System
So Yo-Hwan ; Kim Seok-Soo ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 54~60
This research employs the intelligent survey agent and online application from to help people to locate the information they would want from Internet quickly. Corporate sectors and indivisuals are in need of valuable and relevant information to swiftly adapt to the Internet-driven business or educational environment. Based on Internet GUI environment, this user-friendly online survey and online application form program uses the agent of increasing the interest and participation of users. The system helps along with the decision making process by quickening the information gathering process.
A Construction of Embedded System based on Hardware/Software Co-Design
Park Chun-Myoung ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 61~65
This paper presents a method of constructing the embedded systems based on hardware/software co-design approach that was key methodology. The proposed method was important technology enable to implement advanced multimedia systems and digital contents creating that are rapidly growing of the new information technology.
Watermarking Technique for the Digital Contents Protection
Song Hag-hyun ; Kim Yoon-ho ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 66~72
Beyond the digital world from the analog age, the contents are very easily copied under the illegal conditions and these are rapidly distributed by the information super highway. The increase of ilegal usage and conflict in digital content market would diminish motivation of creators for their work, furthermore break down digital content market on cyberspace. Watermarking technology support to the legal users by the protection technique based chi the digital content copyright protection method(DRM). Most of previous digital watermarking have embeded to the content. In this paper, we have researched the standardization of digital rights management and developed more efficient watermark embedding method.
The Implementation Of Field-Sequential Stereoscopic Endoscope System Using LCD shutter
Seo, Burm-Suk ; Choi, Chul-Ho ; Kwon, Byeong-Heon ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 73~78
In this paper we implemented a field-sequential stereoscopic endoscope system that can generate stereoscopic images with different perspective depth using LCD shutter. The stereoscopic image is generated form stereoscopic adapter that has LCD shutter. We have compared the stereoscopic depth of a field-sequential stereoscopic endoscope system with that of the conventional endoscope system. And the implemented system is verified by evaluation the field-sequential stereoscopic image on a Monitor. This system will be use to medical instruments in time.
The Design and Implementation of Real Time Contrast Enhancer System for High Resolution FPD
Seo, Bum-Suk ; Choi, Chul-Ho ; Kwon, Byeong-Heon ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 79~86
In this paper we implemented the Real Time Contrast Enhancer for image quality enhancement of moving picture. Also we proposed adaptive contrast method that use mean and variance of input video signal. The Designed the contrast Enhancer is measured in comparison with conventional picture and interfaced to 30inch TFT LCD TV of the LG Electronics.
Protection Algorithm of the Multimedia Contents in the Mobile Environment
Kim Hang-Rae ; Park Young ; Choi Nam-Hyung ;
Journal of Digital Contents Society, volume 5, issue 1, 2004, Pages 87~94
In this paper, the digital watermarking algorithm is proposed using CDMA technique for protection of the mobile contents in the mobile environment. The digital watermarking was designed to robust the errors in the mobile environment where pathloss, multipath fading, interference, and noise exist. In case of the multimedia content service in the mobile environment, the construction method of the watermark, the algorithm of insertion and detection are also proposed. The watermark consists of the information of the mobile user. Invisibility and robustness required in watermarking are etimated. It is observed that PSNR of the mobile content inserted the watermark is 90.31 dB, and the signal processing and noise attack are also robust. Especially, because random noise occurs in wireless transmission can overcome, the proposed watermarking algorithm is adequate for protection of the multimedia contents in the mobile environment.