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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 10, Issue 12 - Dec 2007
Volume 10, Issue 11 - Nov 2007
Volume 10, Issue 10 - Oct 2007
Volume 10, Issue 9 - Sep 2007
Volume 10, Issue 8 - Aug 2007
Volume 10, Issue 7 - Jul 2007
Volume 10, Issue 6 - Jun 2007
Volume 10, Issue 5 - May 2007
Volume 10, Issue 4 - Apr 2007
Volume 10, Issue 3 - Mar 2007
Volume 10, Issue 1 - Jan 2007
Selecting the target year
A Cache Consistency Scheme to Consider Period of Data in Mobile Computing Environments
Lim, Jong-Won ; Hwang, Byung-Yeon ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 421~431
Due to the rapid development of wireless communication technology, demands on data services in mobile computing environment are gradually increasing. In mobile computing environments, a mobile host began to use cache to overcome the weak point. Caching at mobile host could reduce the bandwidth consumption and query response time, but mobile host must maintain cache consistency. In this paper, we propose a cache consistency strategy to consider the period of data usage. The server allows an effective broadcasting by classifying data into two groups of periodic and non-periodic. By classifying the data, it prevent from elimination of cache after disconnection of periodic data by using expired time. By storing IR(Invalidation Report) messages, this scheme divides cached data by selection after disconnection. Consequently, we have shown much improvement in total consumption of bandwidth than the conventional scheme.
Small Target Detection Method under Complex FLIR Imagery
Lee, Seung-Ik ; Kim, Ju-Young ; Kim, Ki-Hong ; Koo, Bon-Ho ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 432~440
In this paper, we propose a small target detection algorithm for FLIR image with complex background. First, we compute the motion information of target from the difference between the current frame and the created background image. However, the slow speed of target cause that it has the very low gray level value in the difference image. To improve the gray level value, we perform the local gamma correction for difference image. So, the detection index is computed by using statistical characteristics in the improved image and then we chose the lowest detection index a true target. Experimental results show that the proposed method has significantly the good detection performance.
A Watershed-based Texture Segmentation Method Using Marker Clustering
Hwang, Jin-Ho ; Kim, Won-Hee ; Moon, Kwang-Seok ; Kim, Jong-Nam ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 441~449
In clustering for image segmentation, large amount of computation and typical segmentation errors have been important problems. In the paper, we suggest a new method for minimizing these problems. Markers in marker-controlled watershed transform represent segmented areas because they are starting-points of extending areas. Thus, clustering restricted by marker pixels can reduce computational complexity. In our proposed method, the markers are selected by Gabor texture energy, and cluster information of them are generated by FCM (fuzzy c-mean) clustering. Generated areas from watershed transform are merged by using cluster information of markers. In the test of Brodatz' texture images, we improved typical partition-errors obviously and obtained less computational complexity compared with previous FCM clustering algorithms. Overall, it also took regular computational time.
Hybrid Power-Saving Mode Considering VoIP Traffic in IEEE 802.16e Systems
Lee, Jung-Ryun ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 450~461
In this paper, we propose the method to use power-saving mode (PSM) applicable to non real-time traffic and PSM applicable to real-time traffic simultaneously, for VoIP traffic with silence suppression. The proposed method uses PSC II during talk-spurt interval of parties A and/or B and uses PSC I or probabilistic sleep interval decision (PSID) method during mutual silence interval, respectively. To evaluate the performance of hybrid PSM (HPSM) based on PSC II or PSID method, we present average buffering delay, energy consumption of mobile station and VoIP packet drop probability with simulation runs. Results shows that proposed HPSM decreases energy consumption of mobile station up to 25 % while satisfying the packet drop probability within QoS requirement in case of end-to-end VoIP connection.
Congestion Control Mechanism using Real Time Signaling Information in ATM based MPLS Network
Ahn, Gwi-Im ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 462~469
ATM protocol has the techniques such as cell discarding priority, traffic shaping and traffic policing. ATM based MPLS(Multiprotocol Label Switching) is discussed for its provisioning QoS commitment capabilities, traffic engineering and smooth migration for BcN using conventional ATM infra in Korea. This paper proposes preventive congestion control mechanism for detecting HTR(Hard To Reach) LSP(Label Switched Path) in ATM based MPLS systems. In particular, we decide HTR LSP using real time signaling information(etc., PTI,AIS/RDI) for applying HTR concept in circuit switching to ATM based MPLS systems and use those session gap and percentage based control algorithm that were used in conventional PSTN call controls. We concluded that it maximized the efficiency of network resources by restricting ineffective machine attempts. Proposed control can handle 208% call processing and more than 147% success call, than those without control. It can handle 187% BHCA(Busy Hour Call Attempts) with 100 times less than use of exchange memory.
Classification and Analysis of Next Generation Mobile Communications Services
Kim, Seung-Mok ; Park, Tae-Keun ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 470~482
In this paper, we classify next generation mobile communications services into service categories and develop service evolution scenarios for developing the next generation mobile communications service roadmap in NGMC Forum. Firstly, Service categories are defined based on the purpose of service usage. Secondly, the services are classified into the categories and their relationship is analyzed. The candidates of services to be classified and analyzed include all kinds of services discussed in a conceptual level as well as current mobile/Internet services. Finally, we develop a service evolution scenario in each service category. When the next generation service road map is developed based on the results of this paper, it is expected to secure the initiative and enhance the competitive edge in the field of the next generation mobile communications.
Hierarchy Structure of Situation based on Event for Effective Game Development
Park, Jung-Yong ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 483~491
This paper proposes a Situation Simulation Framework for implementing computer game and describes the possibility of analyzing game with unfolding situation. In last few years game systems have been evolving from the performance of physical engine, network traffic in the on line game to the representation of rendering physical phenomena. In computer game, a situation hierarchy structure which allows the designer for simulating high-level specifications of game structure. Logically simulated environment is created by defining situations and events based on hierarchy structure of the situation. We classify events into explicit event is occurred by user and implicit event is occurred by system. Our study defines the existence of objects is the most prevalent factor applied to any event in game world. The advantages of this approach are able to allow for providing the conceptual design for simulation game and analyzing the situation in the game world. And this method allows us to decrease the complexity of system design and abstraction modeling for the simulation game. Specially, the introduction of the definition of events allows us to approach game design in a structural manner rather than by their classification. The proposed method was implemented in the "Shooting BaDuk" among games.
A Design and Implementation of Facility Management System Using Portable RFID
Kang, Pil-Gu ; Kim, Jae-Hwan ; Chae, Jin-Seok ; Choi, Won-Ik ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 492~505
Currently, most procedures in domestic facility management systems are performed by hand. However, these manually operated facility management systems involve critical limitations, such as a waste of manpower to store collected data into a database, intentional or accidental loss of data consistency (mainly due to a lack of the ability to recognize and deal with frequent changes of facility status in realtime), and so on. To overcome the limitations of such manually operated facility management systems, the following capabilities must be supported. First, the changes in facility status must be recognized in realtime. Second, the data collection process must be secure and reliable to prevent fabrication of collected data and preserve data integrity. Third, the data collection devices must be portable to help the manager collect data about their facilities. To address these problems, we design and implement a novel facility management system using portable RFID, which is designed to support these functionalities and thus help reduce administrative costs. Through extensive experiments, we observed that our system improved the accuracy and reliability of facility check process and helped cut administrative costs by significantly reducing failure frequency.
A Real-time Interactive Shadow Avatar with Facial Emotions
Lim, Yang-Mi ; Lee, Jae-Won ; Hong, Euy-Seok ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 506~515
In this paper, we propose a Real-time Interactive Shadow Avatar(RISA) which can express facial emotions changing as response of user's gestures. The avatar's shape is a virtual Shadow constructed from the real-time sampled picture of user's shape. Several predefined facial animations overlap on the face area of the virtual Shadow, according to the types of hand gestures. We use the background subtraction method to separate the virtual Shadow, and a simplified region-based tracking method is adopted for tracking hand positions and detecting hand gestures. In order to express smooth change of emotions, we use a refined morphing method which uses many more frames in contrast with traditional dynamic emoticons. RISA can be directly applied to the area of interface media arts and we expect the detecting scheme of RISA would be utilized as an alternative media interface for DMB and camera phones which need simple input devices, in the near future.
Implementation of Power Control System for a Long Distance Transmission in Wireless Mesh Network
Park, Tae-Jin ; Park, Man-Gon ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 516~526
Wireless mesh network is not only WLAN technology but it says core technology for implementation of ubiquitous network and we have to application on a various field through connection with the sensor network. However, there are limited to 100mW in the maximum power because WLAN is used into transmission frequency band to ISM band. The mesh network based on WLAN is essential study for a long distance transmission in the limited maximum power that it is doing to cost-efficient network of backbone. Therefore, in this paper, we have presented an conquerable method to limitation of reaching distance of wireless mesh network and made several experiments to presentation the proposed method. The results show that it is possible to rise a long distance transmission and power efficiency into application of various antenna and function definition and implementation of device driver.
A Study on 2D Pattern Design Module and 3D Cloth Simulation System based on Octree Space Subdivision Method
Kim, Ju-Ri ; Joung, Suck-Tae ; Jung, Sung-Tae ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 527~536
This paper proposes a 3D fashion design system that generates a 3D clothes model by using 2D patterns of clothes and drapes the 3D clothes model on a 3D human model. In the proposed system, 2D patterns of clothes are designed by selecting comer points of 2D mesh. After designing 2D patterns, a 3D clothes model is designed by describing the control points to be connected between 2D patterns. The proposed system reads a 3D human body model file and the designed 3D clothes model and creates a 3D human model putting on the clothes by using the mass-spring model based physical simulation. It calculates collision and reaction between the triangles of human body model and those of clothes for realistic simulation. Because the number of triangles is very large, the collision and reaction processing need a lot of time. To solve this problem, the proposed system decreases the number of collision and reaction processing by using the Octree space subdivision technique. It took a few seconds for generating a 3D human model putting on the designed 3D clothes.
Java Preprocessor for Integration of Java and C
Yi, Chang-Hwan ; Oh, Se-Man ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 537~547
According evolution of computer technology, computers execute complex and several tasks. Because of the complexity of program and restriction of programming language, applications are implemented using one more programming language. But it is no general methodology for using several languages and implementing it. This paper classified usages of programming language integration and methodology for implements programming languages integration through HLID(Heterogeneous Language Integration Degree) for solving above problem. And using HLID, it designed and implemented Java Preprocessor that improvement JNI-current implementation for integration between object-oriented language Java and procedural language C.
Object Location Sensing using Signal Pattern Matching Methods
Byun, Yung-Cheol ; Park, Sang-Yeol ;
Journal of Korea Multimedia Society, volume 10, issue 4, 2007, Pages 548~558
This paper presents a method of location sensing of mobile objects using RF devices. By analyzing signal strengths between a certain number of fixed RF devices and a moving RF device, we can recognize the location of a moving object in real time. Firstly, signal strength values between RF devices are gathered, and then the values are normalized and constructed as a model feature vector for specific location. A number of model patterns are acquired and registered for all of the location which we want to recognize. For location sensing, signal strength information for an arbitrary moving RF device is acquired and compared with model feature vectors registered previously. In this case, distance value is calculated and the moving RF device is classified as one of the known model patterns. Experimental results show that our methods have performed the location sensing successfully with 100% rate of recognition when the number of fixed RF devices is 10 or more than 12. In terms of cost and applicability, experimental results seem to be very encouraging.