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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Electronics and Telecommunications Research Institute
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Volume 23, Issue 4 - Dec 2001
Volume 23, Issue 3 - Sep 2001
Volume 23, Issue 2 - Jun 2001
Volume 23, Issue 1 - Mar 2001
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MPEG-7 Homogeneous Texture Descriptor
Ro, Yong-Man ; Kim, Mun-Churl ; Kang, Ho-Kyung ; Manjunath, B.S. ; Kim, Jin-Woong ;
ETRI Journal, volume 23, issue 2, 2001, Pages 41~41
MPEG-7 standardization work has started with the aims of providing fundamental tools for describing multimedia contents. MPEG-7 defines the syntax and semantics of descriptors and description schemes so that they may be used as fundamental tools for multimedia content description. In this paper, we introduce a texture based image description and retrieval method, which is adopted as the homogeneous texture descriptor in the visual part of the MPEG-7 final committee draft. The current MPEG-7 homogeneous texture descriptor consists of the mean, the standard deviation value of an image, energy, and energy deviation values of Fourier transform of the image. These are extracted from partitioned frequency channels based on the human visual system (HVS). For reliable extraction of the texture descriptor, Radon transformation is employed. This is suitable for HVS behavior. We also introduce various matching methods; for example, intensity-invariant, rotation-invariant and/or scale-invariant matching. This technique retrieves relevant texture images when the user gives a querying texture image. In order to show the promising performance of the texture descriptor, we take the experimental results with the MPEG-7 test sets. Experimental results show that the MPEG-7 texture descriptor gives an efficient and effective retrieval rate. Furthermore, it gives fast feature extraction time for constructing the texture descriptor.
A Medium Access Control Protocol for Voice/Data Integrated Wireless CDMA Systems
Lim, In-Taek ;
ETRI Journal, volume 23, issue 2, 2001, Pages 52~52
In this paper, a medium access control protocol is proposed for integrated voice and data services in wireless local networks. Uplink channels for the proposed protocol are composed of time slots with multiple spreading codes per slot based on slotted code division multiple access (CDMA) systems. The proposed protocol uses spreading code sensing and reservation schemes. This protocol gives higher access priority to delay-sensitive voice traffic than to data traffic. The voice terminal reserves an available spreading code to transmit multiple voice packets during a talkspurt. On the other hand, the data terminal transmits a packet without making a reservation over one of the available spreading codes that are not used by voice terminals. In this protocol, voice packets do not come into collision with data packets. The numerical results show that this protocol can increase the system capacity for voice service by applying the reservation scheme. The performance for data traffic will decrease in the case of high voice traffic load because of its low access priority. But it shows that the data traffic performance can be increased in proportion to the number of spreading codes.
Efficient Iris Recognition through Improvement of Feature Vector and Classifier
Lim, Shin-Young ; Lee, Kwan-Yong ; Byeon, Ok-Hwan ; Kim, Tai-Yun ;
ETRI Journal, volume 23, issue 2, 2001, Pages 61~61
In this paper, we propose an efficient method for personal identification by analyzing iris patterns that have a high level of stability and distinctiveness. To improve the efficiency and accuracy of the proposed system, we present a new approach to making a feature vector compact and efficient by using wavelet transform, and two straightforward but efficient mechanisms for a competitive learning method such as a weight vector initialization and the winner selection. With all of these novel mechanisms, the experimental results showed that the proposed system could be used for personal identification in an efficient and effective manner.
Analysis of Electromagnetic Characteristics of a Grounded Slab and a Parallel-Plate Structure Using the SDDI Technique
Choi, Jae-Hoon ; Kahng, Sung-Tek ;
ETRI Journal, volume 23, issue 2, 2001, Pages 71~71
In this paper, the electromagnetic characteristics of a grounded slab and a parallel-plate structure are analyzed by the Spline-type Divided-Difference Interpolation (SDDI) technique. The technique efficiently evaluates the MoM impedance matrix elements of the multifold spectral or spatial domain integrals or summation in integro differential equations. The numerical results of the proposed method agree well with those of the corresponding literatures.
Dynamic Power Supply Current Testing for Open Defects in CMOS SRAMs
Yoon, Doe-Hyun ; Kim, Hong-Sik ; Kang, Sung-Ho ;
ETRI Journal, volume 23, issue 2, 2001, Pages 77~77
The detection of open defects in CMOS SRAM has been a time consuming process. This paper proposes a new dynamic power supply current testing method to detect open defects in CMOS SRAM cells. By monitoring a dynamic current pulse during a transition write operation or a read operation, open defects can be detected. In order to measure the dynamic power supply current pulse, a current monitoring circuit with low hardware overhead is developed. Using the sensor, the new testing method does not require any additional test sequence. The results show that the new test method is very efficient compared with other testing methods. Therefore, the new testing method is very attractive.
Surface Fairing with Boundary Continuity Based on the Wavelet Transform
Cho, Joo-Hyung ; Kim, Tae-Wan ; Lee, Kun-Woo ;
ETRI Journal, volume 23, issue 2, 2001, Pages 85~85
The surface modeling capability of CAD systems is widely used to design products bounded by free form surfaces and curves. However, the surfaces or curves generated by popular data fitting methods usually have shape imperfections such as wiggles. Thus, fairing operations are required to remove the wiggles, which makes the surfaces or curves smooth. This paper proposes a new method based on the wavelet transform for fairing the surfaces or curves while preserving the continuity with adjacent surfaces or curves. The wavelet transform gives a hierarchical perspective of the surfaces and the curves, which can be decomposed into the overall sweep and details, i.e., local deviations from sweep like the wiggles. The proposed fairing method provides a similar effect on the mathematical surface as that of the grinding operation using sandpaper on the physical surface.