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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 25, Issue 6 - Dec 2003
Volume 25, Issue 5 - Oct 2003
Volume 25, Issue 4 - Aug 2003
Volume 25, Issue 3 - Jun 2003
Volume 25, Issue 2 - Apr 2003
Volume 25, Issue 1 - Feb 2003
Selecting the target year
A DRM Framework for Distributing Digital Contents through the Internet
Lee, Jun-Seok ; Hwang, Seong-Oun ; Jeong, Sang-Won ; Yoon, Ki-Song ; Park, Chang-Soon ; Ryou, Jae-Cheol ;
ETRI Journal, volume 25, issue 6, 2003, Pages 423~423
This paper describes our design of a contents distribution framework that supports transparent distribution of digital contents on the Internet as well as copyright protection of participants in the contents distribution value chain. Copyright protection must ensure that participants in the distribution channel get the royalties due to them and that purchasers use the contents according to usage rules. It must also prevent illegal draining of digital contents. To design a contents distribution framework satisfying the above requirements, we first present four digital contents distribution models. On the basis of the suggested distribution models, we designed a contract system for distribution of royalties among participants in the contents distribution channel, a license mechanism for enforcement of contents usage to purchasers, and both a packaging mechanism and a secure client system for prevention of illegal draining of digital contents.
Optimum Uplink Power/Rate Control for Minimum Delay in CDMA Networks
Choi, Kwon-Hue ; Kim, Soo-Young ;
ETRI Journal, volume 25, issue 6, 2003, Pages 437~437
We derive a new joint power and rate control rule with which we can minimize the mean transmission delay in CDMA networks for a given mean transmission power. We show that it is optimal to respectively control the power inverse-linearly and the rate linearly to the square root of channel gain while maintaining the signal-to-interference ratio at a constant. We also show that the proposed joint power/rate control rule achieves excellent performance results in terms of the probability of the instantaneous delay being within a target delay against one-dimensional control schemes.
XML-Based Network Management for IP Networks
Choi, Mi-Jung ; Hong, James W. ; Ju, Hong-Taek ;
ETRI Journal, volume 25, issue 6, 2003, Pages 445~445
XML-based network management, which applies XML technologies to network management, has been proposed as an alternative to existing network management. The use of XML in network management offers many advantages. However, most existing network devices are already embedded with simple network management protocol (SNMP) agents and managed by SNMP managers. For integrated network management, we present the architectures of an XML-based manager, an XML-based agent, and an XML/SNMP gateway for legacy SNMP agents. We describe our experience of developing an XML-based network management system (XNMS), XML-based agent, and an XML/SNMP gateway. We also verify the effectiveness of our XML-based agent and XML/SNMP gateway through performance tests. Our experience with developing XNMS and XML-based agents can be used as a guideline for development of XML-based management systems that fully take advantage of the strengths of XML technologies.
Visual Component Assembly and Tool Support Based on System Architecture
Lee, Seung-Yun ; Kwon, Oh-Cheon ; Shin, Gyu-Sang ;
ETRI Journal, volume 25, issue 6, 2003, Pages 464~464
Component-based development leverages software reusability and reduces development costs. Enterprise JavaBeans (EJB) is a component model developed to reduce the complexity of software development and to facilitate reuse of components. However, EJB does not support component assembly by a plug-and-play technique due to the hard-wired composition at the code level. To cope with this problem, an architecture for EJB component assembly is defined at the abstract level and the inconsistency between the system architecture and its implementation must be eliminated at the implementation level. We propose a component-based application development tool named the COBALT assembler that supports the design and implementation of EJB component assembly by a plug-and-play technique based on the architecture style. The system architecture is first defined by the Architecture Description Language (ADL). The wrapper code and glue code are then generated for the assembly. After the consistency between the architecture and its implementation is checked, the assembled EJB components are deployed in an application server as a new composite component. We use the COBALT assembler for a shopping mall system and demonstrate that it can promote component reuse and leverage the system maintainability.
A New Starting Potential Fair Queuing Algorithm with O(1) Virtual Time Computation Complexity
Kwak, Dong-Yong ; Ko, Nam-Seok ; Kim, Bong-Tae ; Park, Hong-Shik ;
ETRI Journal, volume 25, issue 6, 2003, Pages 475~475
In this paper, we propose an efficient and simple fair queuing algorithm, called new starting potential fair queuing (NSPFQ), which has O(1) complexity for virtual time computation and also has good delay and fairness properties. NSPFQ introduces a simpler virtual time recalibration method as it follows a rate-proportional property. The NSPFQ algorithm recalibrates the system virtual time to the minimum virtual start time among all possible virtual start times for head-of-line packets in backlogged sessions. Through analysis and simulation, we show that the proposed algorithm has good delay and fairness properties. We also propose a hardware implementation framework for the scheduling algorithm.
Hardware-Software Implementation of MPEG-4 Video Codec
Kim, Seong-Min ; Park, Ju-Hyun ; Park, Seong-Mo ; Koo, Bon-Tae ; Shin, Kyoung-Seon ; Suh, Ki-Bum ; Kim, Ig-Kyun ; Eum, Nak-Woong ; Kim, Kyung-Soo ;
ETRI Journal, volume 25, issue 6, 2003, Pages 489~489
This paper presents an MPEG-4 video codec, called MoVa, for video coding applications that adopts 3G-324M. We designed MoVa to be optimal by embedding a cost-effective ARM7TDMI core and partitioning it into hardwired blocks and firmware blocks to provide a reasonable tradeoff between computational requirements, power consumption, and programmability. Typical hardwired blocks are motion estimation and motion compensation, discrete cosine transform and quantization, and variable length coding and decoding, while intra refresh, rate control, error resilience, error concealment, etc. are implemented by software. MoVa has a pipeline structure and its operation is performed in four stages at encoding and in three stages at decoding. It meets the requirements of MPEG-4 SP@L2 and can perform either 30 frames/s (fps) of QCIF or SQCIF, or 7.5 fps (in codec mode) to 15 fps (in encode/decode mode) of CIF at a maximum clock rate of 27 MHz for 128 kbps or 144 kbps. MoVa can be applied to many video systems requiring a high bit rate and various video formats, such as videophone, videoconferencing, surveillance, news, and entertainment.
Optimization of Selective Epitaxial Growth of Silicon in LPCVD
Cheong, Woo-Seok ;
ETRI Journal, volume 25, issue 6, 2003, Pages 503~503
Selective epitaxial growth (SEG) of silicon has attracted considerable attention for its good electrical properties and advantages in building microstructures in high-density devices. However, SEG problems, such as an unclear process window, selectivity loss, and nonuniformity have often made application difficult. In our study, we derived processing diagrams for SEG from thermodynamics on gas-phase reactions so that we could predict the SEG process zone for low pressure chemical vapor deposition. In addition, with the help of both the concept of the effective supersaturation ratio and three kinds of E-beam patterns, we evaluated and controlled selectivity loss and non-uniformity in SEG, which is affected by the loading effect. To optimize the SEG process, we propose two practical methods: One deals with cleaning the wafer, and the other involves inserting dummy active patterns into the wide insulator to prevent the silicon from nucleating.
A Platform-Based SoC Design of a 32-Bit Smart Card
Kim, Won-Jong ; Kim, Seung-Chul ; Bae, Young-Hwan ; Jun, Sung-Ik ; Park, Young-Soo ; Cho, Han-Jin ;
ETRI Journal, volume 25, issue 6, 2003, Pages 510~510
In this paper, we describe the development of a platform-based SoC of a 32-bit smart card. The smart card uses a 32-bit microprocessor for high performance and two cryptographic processors for high security. It supports both contact and contactless interfaces, which comply with ISO/IEC 7816 and 14496 Type B. It has a Java Card OS to support multiple applications. We modeled smart card readers with a foreign language interface for efficient verification of the smart card SoC. The SoC was implemented using 0.25
technology. To reduce the power consumption of the smart card SoC, we applied power optimization techniques, including clock gating. Experimental results show that the power consumption of the RSA and ECC cryptographic processors can be reduced by 32% and 62%, respectively, without increasing the area.
Controlled Growth of Layered Silver Stearate on 2D and 3D Surfaces
Lee, Seung-Joon ; Han, Sang-Woo ; Kim, Kwan ;
ETRI Journal, volume 25, issue 6, 2003, Pages 517~517
This investigation confirms that silver stearate consists of an infinite-sheet, two-dimensional, nonmolecular layered structure. Scanning electron microscopy, X-ray diffraction, and infrared spectroscopy reveal the following: plate-like morphology is identified from the SEM image, XRD peaks can be indexed to the (0k0) reflections of a layered structure, and infrared peaks show that alkyl chains are present in an all-trans conformational state with little or no significant gauche population. Based on these structural characteristics, we demonstrate that silver stearate, a prototype of layered organic-inorganic hybrid material, can be grown not only in a designed two-dimensional pattern but also in three-dimensionally ordered ways by using carboxyl-group terminated nanoparticles as a template.
Approximating the Outage Probability of the Pilot Channel for IS-95-Based Cellular CDMA Systems in the Soft Handover Region
Park, Seung-Keun ; Cho, Pyung-Dong ; Park, Ki-Shik ; Cho, Kyung-Rok ;
ETRI Journal, volume 25, issue 6, 2003, Pages 523~523
This letter presents an approximation of the outage probability of the pilot channel that can be used for CDMA cell planning. The approximation can determine system parameters for soft handover in IS-95-based cellular CDMA downlink design. Computer simulations show that our analytical results agree with empirical results.
Modeling and Analysis of Distance-Based Registration with Implicit Registration
Baek, Jang-Hyun ; Ryu, Byung-Han ;
ETRI Journal, volume 25, issue 6, 2003, Pages 527~527
In this study, we consider distance-based registration (DBR) and propose a DBR with implicit registration (DBIR) in order to improve the performance of the DBR. With analytical models based on a 2-dimensional random walk in a hexagonal cell configuration, we analyzed the performance of the DBR and DBIR. Our results showed that the DBIR always outperforms the DBR.
Effect of Optical Delay on the Suppression of the Power Transient Excursion in a Combined Gain-Controlled Erbium-Doped Fiber Amplifier
Chung, Hee-Sang ; Chang, Sun-Hyok ; Park, Heuk ; Lee, Hyun-Jae ; Chu, Moo-Jung ;
ETRI Journal, volume 25, issue 6, 2003, Pages 531~531
This report describes the effect of optical delay on the suppression of the power transient excursion in a combined gain-controlled erbium-doped fiber amplifier with an internal optical feedback loop (OFL). A simple homogeneous model showed that the optical delay caused a phase change in the oscillation of the surviving and laser channels, which resulted in a reduction of the overall power transient excursion. In addition to the reduction, a real system with a 1528.7-nm OFL shifted the oscillation upward or downward according to channel removal or addition, whereas another one with a 1560.9-nm OFL did not. This different transient behavior reflected a control-wavelength dependence on optical automatic gain control, where spectral-hole burning dominated over relaxation oscillation for 1528.7 nm, and vice versa for 1560.9 nm.
A Rigorous 2D Approximation Technique for 3D Waveguide Structures for BPM Calculations
Han, Young-Tak ; Shin, Jung-Uk ; Kim, Duk-Jun ; Park, Sang-Ho ; Park, Yoon-Jung ; Sung, Hee-Kyung ;
ETRI Journal, volume 25, issue 6, 2003, Pages 535~535
We propose a rigorous 2D approximation technique for the 3D waveguide structures; it can minimize the well-known approximation errors of the commonly used effective index method. The main concept of the proposed technique is to compensate for the effective cladding index in the equivalent slab model of the original channel waveguide from the modal effective index calculated by the nonuniform 2D finite difference method. With simulations, we used the proposed technique to calculate the coupling characteristics of a directional coupler by the 2D beam propagation method, and the results were almost exactly the same as the results calculated by the 3D beam propagation method.