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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Multimedia Society
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Korea Multimedia Society
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Volume & Issues
Volume 6, Issue 7 - Dec 2003
Volume 6, Issue 6 - Oct 2003
Volume 6, Issue 5 - Aug 2003
Volume 6, Issue 4 - Jul 2003
Volume 6, Issue 3 - Jun 2003
Volume 6, Issue 2 - Apr 2003
Volume 6, Issue 1 - Feb 2003
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Design and Implementation of P-DOM for Embedded XML Database System
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 183~193
The importance of XML data and their database supports in a mobile terminal system is on the increase. It leads to active research for embedded XML database systems. In order to handle in documents, DOM API should be supported. The existing DOM API is not suitable for the embedded system with limited resource because the DOM tree requires a large space on main memory. Considering poor resource of embedded systems, we present persistent DOM which is implemented on Berkeley DB and DOMdbm which manages it.
An Optimal Design Method for the Multidimensional Nested Attribute Indexes
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 194~207
This paper presents an optimal design methodology for the multidimensional nested attribute index (MD-NAI) that uses a multidimensional index structure for indexing the nested attributes in object databases. The MD-NAI efficiently supports complex queries involving both nested attributes and class hierarchies, which are not supported by the nested attribute index using one-dimensional index structure such as
-tree. However, the performance of the MD-NAI is very degraded in some cases of user's query types. In this paper, for the performance enhancement of the MD-NAI, we first determine the optimal shape of index page region by using the query information about the nested predicates, and then construct an optimal MD NAI by applying a region splitting strategy that makes the shape of the page regions of the MD-NAI as close as possible to the predetermined optimal one. For performance evaluation, we perform extensive experiments with the MD-NAI using various types of nested predicates and object distribution. The results indicate that our proposed method builds optimal MD-NAI regardless of the query types and object distributions. When the interval ratio of a three-dimensional query region is 1:16:236, the performance of the proposed method is enhanced by as much as 5.5 times over that of the conventional method employing the cyclic splitting strategy.
An Algorithm Generating All the Playable Transcoding Paths using the QoS Transition Diagram for a Multimedia Presentation Requiring Different QoS between the Source and the Destination
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 208~215
For playing a multimedia presentation in a Internet, the case that the presentation QoS(Quality of Services) at a destination nay be different from the QoS of multimedia data at the source occurs frequently. In this case, the process of trancoding the multimedia data at the source Into the multimedia data satisfying the QoS at the destination should be requited. In addition, even the presentation description having the homogeneous QoS at both sides may have different transcoding paths due to the limitation of display terminals or network bandwidth. That is, for a multimedia description, it is required to regenerate a proper transcoding path whenever the displaying terminals or the network environment gets decided. And the delay time required to go through the transcoding path may affect the playability of the give presentation. Therefore it should be checked whether the presentation requiring a transcoding process is able to be played in a real time. In this paper, the algorithm for generating all the possible transcoding paths for a given multimedia description under a fixed set of transcoders and the network environment is proposed. The algorithm adopts the concept of QoS transition diagram to Prevent from a trancoding Path being cycled by the repetition of a cyclic Path which generates the same QoS of multimedia data as its input QoS. By eliminating all the cyclic Paths, the algorithm can guarantee the termination of the process. And for the playability check, a method of computing the transcoding time and the delay lime between logical data units are proposed.Finally all the proposed methods were implemented in the stream engine, called TransCore and the presentation-authoring tool, called VIP, we had developed. And the test results with sample scenarios were presented at the last.
An On-line Speech and Character Combined Recognition System for Multimodal Interfaces
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 216~223
In this paper, we present SCCRS(Speech and Character Combined Recognition System) for speaker /writer independent. on-line multimodal interfaces. In general, it has been known that the CHMM(Continuous Hidden Markov Mode] ) is very useful method for speech recognition and on-line character recognition, respectively. In the proposed method, the same CHMM is applied to both speech and character recognition, so as to construct a combined system. For such a purpose, 115 CHMM having 3 states and 9 transitions are constructed using MLE(Maximum Likelihood Estimation) algorithm. Different features are extracted for speech and character recognition: MFCC(Mel Frequency Cepstrum Coefficient) Is used for speech in the preprocessing, while position parameter is utilized for cursive character At recognition step, the proposed SCCRS employs OPDP (One Pass Dynamic Programming), so as to be a practical combined recognition system. Experimental results show that the recognition rates for voice phoneme, voice word, cursive character grapheme, and cursive character word are 51.65%, 88.6%, 85.3%, and 85.6%, respectively, when not using any language models. It demonstrates the efficiency of the proposed system.
The Optimal Skeleton Method of an Image
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 224~229
In this paper, an effective skeleton method is proposed in order to obtain an enhanced digital image of skeleton line. The edge-detection method is applied in the preprocessing stage and after that, the modified Parallel method is applied to obtain the improved image of skeleton line. The existing parallel methods are Zhang, Lu and Wang, and Paul methods. Firstly, a parallel process method Is applied, and the proposed method is applied that the original is compared with the four neighbor pixels and four corner pixels of mask. In conclusion, the proposed method shows an improved connectivity and quality of skeleton line.
3D Face Recognition using Projection Vectors for the Area in Contour Lines
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 230~239
This paper presents face recognition algorithm using projection vector reflecting local feature for the area in contour lines. The outline shape of a face has many difficulties to distinguish people because human has similar face shape. For 3 dimensional(3D) face images include depth information, we can extract different face shapes from the nose tip using some depth values for a face image. In this thesis deals with 3D face image, because the extraction of contour lines from 2 dimensional face images is hard work. After finding nose tip, we extract two areas in the contour lilies from some depth values from 3D face image which is obtained by 3D laser scanner. And we propose a method of projection vector to localize the characteristics of image and reduce the number of index data in database. Euclidean distance is used to compare of similarity between two images. Proposed algorithm can be made recognition rate of 94.3% for face shapes using depth information.
Fast Image Retrieval Based on Object Regions Using Bidirectional Round Filter
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 240~246
In this paper, we propose the fast image retrieval method based on object regions using bidirectional round filter in the wavelet transform region. A conventional method that extracts feature vectors on the whole of subband is reduced retrieval efficiency, because of unnecessary background information. The proposed method that extracts feature vectors on the only object region of subband by using bidirectional round filter improve retrieval efficiency, because of removing of background information. And it certainly maintains retrieval efficiency in case of reduction of feature vectors according to color information. Consequently, the retrieval efficiency is improved with 2.5%∼5.3% values, which have a little changes according to characteristics of image.
Computational Analysis of PCA-based Face Recognition Algorithms
Hyeon Joon Moon ; Sang Hoon Kim ;
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 247~258
Principal component analysis (PCA) based algorithms form the basis of numerous algorithms and studies in the face recognition literature. PCA is a statistical technique and its incorporation into a face recognition system requires numerous design decisions. We explicitly take the design decisions by in-troducing a generic modular PCA-algorithm since some of these decision ate not documented in the literature We experiment with different implementations of each module, and evaluate the different im-plementations using the September 1996 FERET evaluation protocol (the do facto standard method for evaluating face recognition algorithms). We experiment with (1) changing the illumination normalization procedure; (2) studying effects on algorithm performance of compressing images using JPEG and wavelet compression algorithms; (3) varying the number of eigenvectors in the representation; and (4) changing the similarity measure in classification process. We perform two experiments. In the first experiment, we report performance results on the standard September 1996 FERET large gallery image sets. The result shows that empirical analysis of preprocessing, feature extraction, and matching performance is extremely important in order to produce optimized performance. In the second experiment, we examine variations in algorithm performance based on 100 randomly generated image sets (galleries) of the same size. The result shows that a reasonable threshold for measuring significant difference in performance for the classifiers is 0.10.
Multi-Level Motion Estimation Algorithm Using Motion Information in Blocks
Heak Bong Kwon ;
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 259~266
In this paper, we propose a multi-level block matching algorithm using motion information in blocks. In the proposed algorithm, the block-level is decided by the motion degree in the block before motion searching procedure, and then adequate motion searching performs according to the block-level. This improves computational efficiency by eliminating the unnecessary searching Process in no motion or low motion regions, and brings more accurate estimation results by deepening motion searching Process in high motion regions. Simulation results show that the proposed algorithm brings the lower estimation error about 20％ MSE reduction with the fewer blocks pet frame and the operation number was reduced to 56% compared to TSSA and 98% compared to FS -BMA with constant block size.
A Design for Mobile Contents Converting Using XML Parser Extraction
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 267~275
The development of the mobile communication has been enlarged gradually and has been changed voice centered services into data centered ones supporting Internet to provide various kinds of mobile internet services. Researches for data transmission have been achieved actively lot the effective approachment of web in the mobile terminal. The users using mobile communication are increasing for its easy handcarried and movement and the information in internet based upon wire communication has been changed into mobile communication fast. The development of mobile internet requires various mobile contents using mobile internet at any time and at any place due to rapid enhance of network capacity and mobile internet according to network expansion. To accept these needs, there are many difficult problems that contents must be remade according to various terminal features and the develoument costs much. To solve these problems, this paper has the pun)me that contents of Web documents are changed and processed through XML palter and design new mobile contents system, providing mobile services rapidly and obtaining the charge reduction result with the enhance of contents development to the shortening of a development Period.
Development of Mobile Java Browser for Wireless Internet
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 276~287
Wireless Internet has to offer various types of services as much as wired network does in the scope of Internet business. The browser for simple data service using SMS in the early wireless internet cannot serve various multimedia contents. In this paper, We design and implement a Java browser that runs Java program, by adding JVM(Java Virtual Machine) into the web browser for mobile terminals. The Java browser for mobile terminals dynamically loads various Java program you want. This browser makes it possible to be multipurpose mobile terminals for E-Commerce, E-Wallet, Game Device.
Certificate Issuing Protocol Supporting WAKE-KR
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 288~300
As the importance of information security gets recognized seriously, ciphers technology gets used more. Particularly, since public key ciphers are easier to control the key than symmetric key ciphers and also digital signature is easily implemented, public key ciphers are increased used. Nowadays, public key infrastructure is established and operated to use efficiently and securely the public key ciphers. In the public key infrastructure, the user registers at the certificate authority to generate the private key and public key pair and the certificate authority issues the certificate on the public key generated. Through this certificate, key establishment between users is implemented and encryption communication becomes possible. But, control function of session key established in the public key infrastructure is not provided. In this thesis, the certificate issuing protocol to support the key recovery of the session key established during the wireless authentication and key establishment is proposed.
Performance Improvement of the Multicast Switch using Output Scheduling Scheme
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 301~308
In this paper, we propose a multicast ATM switch that reduces traffic load by using the method of storing unicast cells and multicast cells separately according to the type of the cells. The switch is based on a shared memory type to reduce HOL blocking and deadlock. In the proposed switch, we use a control scheme that schedules stored cells to output ports to reduce the loss of traffic cells and to output effectively. We analyzed the Performance of the proposed switch through the computer simulation and the results have shown the effectiveness of the switch.
Extracting Information from XML Documents by Reverse Generating DTDs
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 309~318
XML documents are widely used for exchanging information in the distributed computing environment. Here, actual information contained in the document can only be interpreted with the provision of a proper DTD. However, XML documents collected from the web nay not always be accompanied by corresponding DTD, so that it may not be easy to extract information from such sources. In this study, we reverse construct a DTD from DTU-unknown XML sources. We then use the DTD to extract information from XML inputs and to store it into the underlying DB. The DTD construction module developed is designed in such a way that, it scans input XML files in 1-path, where most other implementations use 2-path approach. The information extraction module provides clean Java programming interfaces as well, so that it can be easily integrated with other web applications.
Design of a Wideband Analog Tunable Element for Multimedia System
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 319~324
In this paper, a new wideband tunable analog element for multimedia system is proposed. The proposed active element is composed of the complementary cascode circuit which can extend transconductance of an element. Therefore, the unity gain frequency which is determined transconductance is increased than that of the conventional element. And then these results are verified by the 0.22
CMOS n-well parameter simulation. As a result, the gam and the unity gam frequency are 42dB and 200MHz on 2V supply voltage. And power dissipation of the designed element is 0.32mW.
Design of The Bluetooth Negative Resistor Oscillator using the Improved Spiral Inductor
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 325~331
In this paper, we designed a spiral inductor and voltage controlled oscillator with the negative resistor for the bluetooth receiver by using 0.25
1-poly 5-metal CMOS n-well process. The proposed inductor, which applies multi layer metal structure, is a structure that decreases resistance value by increasing he metal thickness. As the resistance value decreases, the quality factor Q has improved. Also, voltage-controlled oscillator is designed applying 1 port negative resistance, and changes its oscillating frequency by varying outside capacitor values. The simulation results show that oscillating frequency is 2.33~2.58GHz changing from 2pF to 14pF, and the oscillator has oscillating power over 0dBm.
Visualization Tool Design for Searching Process of Particle Swarm Optimization
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 332~339
To solve the large scale optimization problem approximately, various approaches have been introduced. Recently the Particle Swarm Optimization has been introduced. The Particle Swarm Optimization simulates the process of birds flocking or fish schooling for food, as with the information of each agent is skated by other agents. The Particle Swarm Optimization technique has been applied to various optimization problems whose variables are continuous. However, there are seldom trials for visualization of searching process. This paper proposes a new visualization tool for searching process of Particle Swarm Optimization algorithm. The proposed tool is effective for understanding the searching process of Particle Swarm Optimization method and educational for students. The computational results can be shown tiny and very helpful for education.
Implementation of Multi-Protocol Interface for Web-based Collaborative Service
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 340~351
We introduce our experiences of the design and implementation of the Page Together system that has expanded hyperlink metaphor to utilize human resources in the web. This system supports that a user connects with others in the web, communicates through video/audio channel, navigates same web pages simultaneously and cooperates some work on Internet. For these functions, it comprises Collaborative Browsing Module (CBM), Multimedia Conferencing Module(MCM) Data Conferencing Module(I)CM) and Multi Protocol Interface(MPI). We adopted three standard protocols, IEC, H.323 and T.120 for each nodule and it allows developers to use them easily. We also defined MPI to synchronize information of session among modules. Each module exchanges information each other in session creating process and session terminating process. After a session is created once, each module works independently as its won protocol. Interferences among modules are reduced as minimizing to exchange information. We also introduce a web site that provides web board service based on the Page Together system. A user may post a notice with a link to himself/herself on our web board. After then, if someone read that notice and has any question about it, he or she can try to connect to the writer as clicking the link in that notice and communicate each other. This service site shows that our system can be applied to diverse internet services such as distance teaming and distance conference.
Design of Bluetooth Receiver Front-end using High Gain Low Noise Amplifier and Microstrip Bandpass Filter
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 352~359
In this paper, we designed the bluetooth receiver using the microstrip bandpass filter and the high gain low noise amplifier with the 0.2
CMOS technology. A cascode inverter is adopted to implement the low noise amplifier and is one stage amplifier with a voltage reference and without the choke inductor. The designed 2.4GHz LNA was achieved a power gain of 18dB, a noise figure of 2.8dB, and the power consumption of 255mW at 2.5V power supply. Also, the microstrip receiver bandpass filter was designed that the center frequency was 2.45GHz, the bandwidth was 4% and the insert attenuation was -1.9dB. When the microstrip bandpass filter and LNA was simulated together the power gain was 16.3dB.
Design and Implementation of HoleInOne Metasearch System
Journal of Korea Multimedia Society, volume 6, issue 2, 2003, Pages 360~373
The Meta Search system proposed in this paper is operated based on relevance distribution Infer mation(RDI). It first evaluates the sources applicable to the search, and then selects the most appropriate source. According to the evaluation of the sources, it discreetly collects the documents from the concerned sources and classifies them into a useful order based on the RDI, which is an evaluation score of the sources. The documents are classified into order and presented to the user as a single search result. For this Purpose, this study presents evaluation factor models to present the RDI between the query, and source, and proposes a method for drawing out the RDI based on the evaluation factors. The system for selecting the most appropriate sources according to the query has been developed based on an algorithm that selects the best source. Finally, after searching the documents suitable for query from extracted sources, we present a Meta Search system, HoleInOne, that ranks and merges them.