Electronics and Telecommunication Research Institute

Displaying 1-40 of 147 results

  • White Papers // Jun 2012

    Interference Management With Block Diagonalization for Macro/Femto Coexisting Networks

    A femtocell is a small cellular base station, typically designed for use in a home or small business. The random deployment of a femtocell has a critical effect on the performance of a macrocell network due to co-channel interference. Utilizing the advantage of a multiple-input multiple-output system, each Femto Base...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Analyzing the Economic Effect of Mobile Network Sharing in Korea

    As mobile markets in most developed countries are rapidly coming close to saturation, it is increasingly challenging to cover the cost of providing the network, as revenues are not growing. This has driven mobile operators, thus far mostly involved in facility-based competition, to turn their attention to network sharing. There...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Closed-Loop Transmit Diversity Techniques for Small Wireless Terminals and Their Performance Assessment in a Flat Fading Channel

    Closed-loop transmit diversity is considered an important technique for improving the link budget in the third generation and future wireless communication standards. This paper proposes several transmit diversity algorithms suitable for small wireless terminals and presents performance assessment in terms of average Signal-to-Noise Ratio (SNR) and outage improvement, convergence, and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Scate: A Scalable Time and Energy Aware Actor Task Allocation Algorithm in Wireless Sensor and Actor Networks

    In many applications of Wireless Sensor Actor Networks (WSANs) that often run in harsh environments, the reduction of completion times of tasks is highly desired. The authors present a new time-aware, energy-aware, and starvation-free algorithm called Scate for assigning tasks to actors while satisfying the scalability and distribution requirements of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Multimedia Service Discrimination Based on Fair Resource Allocation Using Bargaining Solutions

    The authors deal with a resource allocation problem for multimedia service discrimination in wireless networks. They assume that a service provider allocates network resources to users who can choose and access one of the discriminated services. To express the rational service selection of users, the utility function of users is...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Low-Cost, Low-Power, High-Capacity 3R OEO-Type Reach Extender for a Long-Reach TDMA-PON

    This paper proposes a low-cost, low-power, and high-capacity optical-electrical-optical-type reach extender that can provide 3R frame regeneration and remote management to increase the reach and split ratio with no change to a legacy time division multiple access passive optical network. To provide remote management, the extender gathers information regarding optical...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    High-Frequency Modeling and Optimization of E/O Response and Reflection Characteristics of 40 Gb/s EML Module for Optical Transmitters

    A complete high-frequency small-signal circuit model of a 40 Gb/s butterfly electro-absorption modulator integrated laser module is presented for the first time to analyze and optimize its Electro-Optic (E/O) response and reflection characteristics. An agreement between measured and simulated results demonstrates the accuracy and validity of the procedures. By optimizing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Modified RHKF Filter for Improved DR/GPS Navigation Against Uncertain Model Dynamics

    In this paper, an error compensation technique for a Dead Reckoning (DR) system using a magnetic compass module is proposed. The magnetic compass-based azimuth may include a bias that varies with location due to the surrounding magnetic sources. In this paper, the DR system is integrated with a Global Positioning...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    High-Quality and Robust Reversible Data Hiding by Coefficient Shifting Algorithm

    This paper presents two reversible data hiding schemes based on the Coefficient Shifting (CS) algorithm. The first scheme uses the CS algorithm with a mean predictor in the spatial domain to provide a large payload while minimizing distortion. To guard against manipulations, the second scheme uses a robust version of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2011

    Handover Ranging Power Adjustment Using Uplink Channel Information in IEEE 802.16e/m

    This paper proposes a handover ranging power adjustment scheme to improve handover performance. Incorrect ranging power can degrade handover performance due to the increased handover latency; therefore, the proposed scheme exploits the uplink channel information to adjust the uplink handover ranging power. Simulation results demonstrate that the proposed scheme reduces...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    A Low-Complexity Planar Antenna Array for Wireless Communication Applications: Robust Source Localization in Impulsive Noise

    This paper proposes robust source localization methods for estimating the azimuth angle, elevation angle, velocity, and range using a low-complexity planar antenna array in impulsive non-Gaussian noise environments. The proposed robust source localization methods for wireless communication applications are based on nonlinear M-estimation provided from Huber and Hampel. Simulation results...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Statistical Analysis of a Subjective QoE Assessment for VVoIP Applications

    A successful deployment of multimedia applications over wireless environments entails improving the Quality of Service (QoS), not only from a technical point of view, but also considering the Quality of Experience (QoE) from the final user's perception. Although objective QoE measure models avoid the difficulties of subjective surveys, subjective QoE...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Measurement Scheme for One-Way Delay Variation With Detection and Removal of Clock Skew

    One-Way Delay Variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality, especially for real-time and streaming services such as Voice-over-Internet-Protocol (VoIP) and video. Many schemes for OWDV measurement require clock synchronization through the Global-Positioning System (GPS) or network time protocol....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Reducing Channel Capacity for Scalable Video Coding in a Distributed Network

    In recent years, the development of multimedia devices has meant that a wider multimedia streaming service can be supported, and there are now many ways in which TV channels can communicate with different terminals. Generally, scalable video streaming is known to provide more efficient channel capacity than simulcast video streaming....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Concentric Circle-Based Image Signature for Near-Duplicate Detection in Large Databases

    Many applications dealing with image management need a technique for removing duplicate images or for grouping related (near-duplicate) images in a database. This paper proposes a concentric circle-based image signature which makes it possible to detect near-duplicates rapidly and accurately. An image is partitioned by radius and angle levels from...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Rack-Level DC Power Solution for Volume Servers

    Rack-level DC power supply is the optimal technology for providing DC power to a volume server without any power infrastructure changes in an existing AC data center. In this paper, the authors propose a smartly controllable and monitorable DC rack power system. The proposed system improves power efficiency by changing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Secure Face Authentication Framework in Open Networks

    In response to increased security concerns, biometrics is becoming more focused on overcoming or complementing conventional knowledge and possession-based authentication. However, biometric authentication requires special care since the loss of biometric data is irrecoverable. In this paper, the authors present a biometric authentication framework, where several novel techniques are applied...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Efficient Multiplexing Scheme of Stereoscopic Video Sequences for Digital Broadcasting Services

    This paper introduces a stereoscopic video broadcasting system that provides 3D visual service and has full backward compatibility with legacy Digital TeleVision (DTV) service in the same channel capacity. The proposed stereoscopic video broadcasting system in this paper is composed of both a hybrid codec and a multiplexer with a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Chip Impedance Evaluation Method for UHF RFID Transponder ICs Over Absorbed Input Power

    Based on a de-embedding technique, a new method is proposed which is capable of evaluating chip impedance behavior over absorbed power in flip-chip bonded UHF radio frequency identification transponder ICs. For the de-embedding, four compact co-planar test fixtures, an equivalent circuit for the fixtures, and a parameter extraction procedure for...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    OPRoS: A New Component-Based Robot Software Platform

    A component is a reusable and replaceable software module accessed through its interface. Component-based development is expected to shorten the development period, reduce maintenance costs, and improve program reusability and the interoperability of components. This paper proposes a new robot software component platform in order to support the entire process...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Hardware-Aware Rate Monotonic Scheduling Algorithm for Embedded Multimedia Systems

    Many embedded multimedia systems employ special hardware blocks to co-process with the main processor. Even though an efficient handling of such hardware blocks is critical on the overall performance of real-time multimedia systems, traditional real-time scheduling techniques cannot afford to guarantee a high quality of multimedia playbacks with neither delay...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Content Protective Multi-Agent Platform for MsMu Service and Pattern-Based Content Management

    Recent research on mobile Internet protocol television and Digital Right Management (DRM) interconnections has focused on multimedia technologies designed to enhance content scalability and adaptive content distribution. However, due to the architectural and scalable limitations, recent systems are not flexible and securable with respect to their adaptive content distribution and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    A Novel Approach for Mining High-Utility Sequential Patterns in Sequence Databases

    Mining sequential patterns is an important research issue in data mining and knowledge discovery with broad applications. However, the existing sequential pattern mining approaches consider only binary frequency values of items in sequences and equal importance/significance values of distinct items. Therefore, they are not applicable to actually represent many real-world...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Virtual Reality Content-Based Training for Spray Painting Tasks in the Shipbuilding Industry

    Training is one of the representative application fields of virtual reality technology where users can have virtual experience in a training task and working environment. Widely used in the medical and military fields, virtual reality-based training systems are also useful in industrial fields, such as the aerospace industry, since they...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    A Robust Mutual Authentication Protocol for Wireless Sensor Networks

    Authentication is an important service in Wireless Sensor Networks (WSNs) for an unattended environment. Recently, Das proposed a hash-based authentication protocol for WSNs, which provides more security against the masquerade, stolen-verifier, replay, and guessing attacks and avoids the threat which comes with having many logged-in users with the same login-id....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Disguised-Face Discriminator for Embedded Systems

    In this paper, the authors introduce an improved Adaptive Boosting (AdaBoost) classifier and its application, a disguised-face discriminator that discriminates between bare and disguised faces. The proposed classifier is based on an AdaBoost learning algorithm and regression technique. In the process, the lookup table of AdaBoost learning is utilized. The...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Joint Channel Coding Based on Principal Component Analysis

    This paper proposes a new joint channel coding algorithm based on principal component analysis. A conventional joint channel coder using passive downmixing undergoes a reduction of both the Primary-to-Ambient energy Ratio (PAR) of the downmix signal and the panning gain ratio of the primary source. The proposed system preserves the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    On-Chip Bus Serialization Method for Low-Power Communications

    One of the critical issues in on-chip serial communications is increased power consumption. In general, serial communications tend to dissipate more energy than parallel communications due to bit multiplexing. This paper proposes a low-power bus serialization method. This encodes bus signals prior to serialization so that they are converted into...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Adaptive Cooperative Spectrum Sharing Based on Fairness and Total Profit in Cognitive Radio Networks

    A cooperative model is presented to enable sharing of the spectrum with secondary users. Compared with the optimal model and competitive model, the cooperative model could reach the maximum total profit for secondary users with better fairness. The cooperative model is built based on the Nash equilibrium. Then a conceding...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Design and Implementation of a Latency Efficient Encoder for LTE Systems

    The operation time of an encoder is one of the critical implementation issues for satisfying the timing requirements of Long Term Evolution (LTE) systems because the encoder is based on binary operations. In this paper, the authors propose a design and implementation of a latency efficient encoder for LTE systems....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Low-Cost High-Performance TDD Synchronizer for WiBro RF Repeater

    WiBro Radio Frequency (RF) repeater is used for solving the problem of partial shadow areas in the wireless communication field that uses Time-Division Duplexing (TDD) mode. In this paper, a method to efficiently generate TDD signals for WiBro RF repeater is proposed and its digital circuit is implemented. A TDD...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Channel Estimation and LDPC Code Puncturing Schemes Based on Incremental Pilots for OFDM

    In this paper, the authors propose a channel estimation algorithm based on incremental pilots. These are pilots additionally inserted after puncturing the modulated Orthogonal Frequency Division Multiplexing (OFDM) symbols to enhance channel estimation performance without lowering bandwidth efficiency. A low-density parity-check code puncturing scheme is also proposed to prevent the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Design for a Dual-Frequency Antenna-in-Package

    For an Antenna-in-Package (AiP), via holes are used to connect the antenna ground and system ground. In this paper, a dual-frequency AiP with a U-slot embedded in the patch is proposed. By properly arranging three via holes under the non-radiating edge, an AiP with two resonant frequencies is realized. Then...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Broadband Stacked Patch Antenna With Low VSWR and Low Cross-Polarization

    A low cross-polarization broadband stacked patch antenna is proposed. By means of the stacked patch configuration and probe-fed strip feed technique, the VSWR 1.2:1 bandwidth of the patch antenna is enhanced to 22% from 804 MHz to 1,002 MHz, which outperforms the other available patch antennas (

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Scalable Path Computation Flooding Approach for PCE-Based Multi-Domain Networks

    In this paper, the authors assess the scalability of a Path Computation Flooding (PCF) approach to compute optimal end-to-end inter-domain paths in a path computation element-based multi-domain network. PCF yields a drastically reduced network blocking probability compared to a blind per-domain path computation but introduces significant network control overhead and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Enhanced Block-Based Adaptive Loop Filter With Multiple Symmetric Structures for Video Coding

    In this paper, the authors present an Enhanced Block-based Adaptive Loop Filter (E-BALF) with multiple filter symmetric structures. The E-BALF adapts various filter symmetric structures in a rate-distortion optimization sense, reflecting the statistical properties of each image in a video sequence. Experimental results show that the proposed method achieves a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Dynamic Collaborative Cloud Service Platform: Opportunities and Challenges

    This paper presents a model for a Dynamic Collaboration (DC) platform among Cloud Providers (CPs) that prevents adverse business impacts, cloud vendor lock-in and violation of service level agreements with consumers, and also offers collaborative cloud services to consumers. The authors consider two major challenges. The first challenge is to...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2010

    Non-Data-Aided Weighted Non-Coherent Receiver for IR-UWB PPM Signals

    This paper proposes an energy-detection-based Non-Data Aided Weighted Non-Coherent Receiver (NDA-WNCR) scheme for Impulse Radio Ultra-WideBand (IR-UWB) pulse-position modulated signals. Compared to the conventional WNCR, the optimal weights of the proposed NDA-WNCR are tremendously simplified as the maximum eigenvector of the IRUWB signal energy sample autocorrelation matrix. The NDAWNCR serves...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2010

    Multiband Meandered Monopole Antenna for Mobile Applications

    A multiband meandered monopole antenna is proposed for Digital Video Broadcasting Handheld (DVB-H), global positioning system, personal communications service, Wireless broadband (Wibro), and Wireless Local Area Network (WLAN) applications. The proposed antenna consists of a meandered line, a shorted length strip line, and a conductor strip between a meandered line...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2010

    Augmented Rotation-Based Transformation for Privacy-Preserving Data Clustering

    Multiple Rotation-Based Transformation (MRBT) was introduced recently for mitigating the Apriori-Knowledge Independent Component Analysis (AK-ICA) attack on Rotation-Based Transformation (RBT), which is used for privacy-preserving data clustering. MRBT is shown to mitigate the AK-ICA attack but at the expense of data utility by not enabling conventional clustering. In this paper,...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    An Architecture of Unknown Attack Detection System Against Zero-Day Worm

    The authors have introduced the ZASMIN (Zeroday-Attack Signature Management Infrastructure) system, which is developed for novel network attack detection. This system provides early warning at the moment the attacks start to spread on the network and to block the spread of the cyber attacks by automatically generating a signature that...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2009

    Mitigating the ICA Attack Against Rotation Based Transformation for Privacy Preserving Clustering

    While it is important for data owners to publish their data to a third party for providing data mining services, the privacy of the data itself needs to be maintained. Therefore, several perturbation methods have been introduced considering potential applications. One of these methods is the Rotation Based Transformation (RBT)...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Interference Management With Block Diagonalization for Macro/Femto Coexisting Networks

    A femtocell is a small cellular base station, typically designed for use in a home or small business. The random deployment of a femtocell has a critical effect on the performance of a macrocell network due to co-channel interference. Utilizing the advantage of a multiple-input multiple-output system, each Femto Base...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Analyzing the Economic Effect of Mobile Network Sharing in Korea

    As mobile markets in most developed countries are rapidly coming close to saturation, it is increasingly challenging to cover the cost of providing the network, as revenues are not growing. This has driven mobile operators, thus far mostly involved in facility-based competition, to turn their attention to network sharing. There...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Closed-Loop Transmit Diversity Techniques for Small Wireless Terminals and Their Performance Assessment in a Flat Fading Channel

    Closed-loop transmit diversity is considered an important technique for improving the link budget in the third generation and future wireless communication standards. This paper proposes several transmit diversity algorithms suitable for small wireless terminals and presents performance assessment in terms of average Signal-to-Noise Ratio (SNR) and outage improvement, convergence, and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Scate: A Scalable Time and Energy Aware Actor Task Allocation Algorithm in Wireless Sensor and Actor Networks

    In many applications of Wireless Sensor Actor Networks (WSANs) that often run in harsh environments, the reduction of completion times of tasks is highly desired. The authors present a new time-aware, energy-aware, and starvation-free algorithm called Scate for assigning tasks to actors while satisfying the scalability and distribution requirements of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Multimedia Service Discrimination Based on Fair Resource Allocation Using Bargaining Solutions

    The authors deal with a resource allocation problem for multimedia service discrimination in wireless networks. They assume that a service provider allocates network resources to users who can choose and access one of the discriminated services. To express the rational service selection of users, the utility function of users is...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Low-Cost, Low-Power, High-Capacity 3R OEO-Type Reach Extender for a Long-Reach TDMA-PON

    This paper proposes a low-cost, low-power, and high-capacity optical-electrical-optical-type reach extender that can provide 3R frame regeneration and remote management to increase the reach and split ratio with no change to a legacy time division multiple access passive optical network. To provide remote management, the extender gathers information regarding optical...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    High-Frequency Modeling and Optimization of E/O Response and Reflection Characteristics of 40 Gb/s EML Module for Optical Transmitters

    A complete high-frequency small-signal circuit model of a 40 Gb/s butterfly electro-absorption modulator integrated laser module is presented for the first time to analyze and optimize its Electro-Optic (E/O) response and reflection characteristics. An agreement between measured and simulated results demonstrates the accuracy and validity of the procedures. By optimizing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Modified RHKF Filter for Improved DR/GPS Navigation Against Uncertain Model Dynamics

    In this paper, an error compensation technique for a Dead Reckoning (DR) system using a magnetic compass module is proposed. The magnetic compass-based azimuth may include a bias that varies with location due to the surrounding magnetic sources. In this paper, the DR system is integrated with a Global Positioning...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    High-Quality and Robust Reversible Data Hiding by Coefficient Shifting Algorithm

    This paper presents two reversible data hiding schemes based on the Coefficient Shifting (CS) algorithm. The first scheme uses the CS algorithm with a mean predictor in the spatial domain to provide a large payload while minimizing distortion. To guard against manipulations, the second scheme uses a robust version of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    A Low-Complexity Planar Antenna Array for Wireless Communication Applications: Robust Source Localization in Impulsive Noise

    This paper proposes robust source localization methods for estimating the azimuth angle, elevation angle, velocity, and range using a low-complexity planar antenna array in impulsive non-Gaussian noise environments. The proposed robust source localization methods for wireless communication applications are based on nonlinear M-estimation provided from Huber and Hampel. Simulation results...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Statistical Analysis of a Subjective QoE Assessment for VVoIP Applications

    A successful deployment of multimedia applications over wireless environments entails improving the Quality of Service (QoS), not only from a technical point of view, but also considering the Quality of Experience (QoE) from the final user's perception. Although objective QoE measure models avoid the difficulties of subjective surveys, subjective QoE...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Measurement Scheme for One-Way Delay Variation With Detection and Removal of Clock Skew

    One-Way Delay Variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality, especially for real-time and streaming services such as Voice-over-Internet-Protocol (VoIP) and video. Many schemes for OWDV measurement require clock synchronization through the Global-Positioning System (GPS) or network time protocol....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Reducing Channel Capacity for Scalable Video Coding in a Distributed Network

    In recent years, the development of multimedia devices has meant that a wider multimedia streaming service can be supported, and there are now many ways in which TV channels can communicate with different terminals. Generally, scalable video streaming is known to provide more efficient channel capacity than simulcast video streaming....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Concentric Circle-Based Image Signature for Near-Duplicate Detection in Large Databases

    Many applications dealing with image management need a technique for removing duplicate images or for grouping related (near-duplicate) images in a database. This paper proposes a concentric circle-based image signature which makes it possible to detect near-duplicates rapidly and accurately. An image is partitioned by radius and angle levels from...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Rack-Level DC Power Solution for Volume Servers

    Rack-level DC power supply is the optimal technology for providing DC power to a volume server without any power infrastructure changes in an existing AC data center. In this paper, the authors propose a smartly controllable and monitorable DC rack power system. The proposed system improves power efficiency by changing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Secure Face Authentication Framework in Open Networks

    In response to increased security concerns, biometrics is becoming more focused on overcoming or complementing conventional knowledge and possession-based authentication. However, biometric authentication requires special care since the loss of biometric data is irrecoverable. In this paper, the authors present a biometric authentication framework, where several novel techniques are applied...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Efficient Multiplexing Scheme of Stereoscopic Video Sequences for Digital Broadcasting Services

    This paper introduces a stereoscopic video broadcasting system that provides 3D visual service and has full backward compatibility with legacy Digital TeleVision (DTV) service in the same channel capacity. The proposed stereoscopic video broadcasting system in this paper is composed of both a hybrid codec and a multiplexer with a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Chip Impedance Evaluation Method for UHF RFID Transponder ICs Over Absorbed Input Power

    Based on a de-embedding technique, a new method is proposed which is capable of evaluating chip impedance behavior over absorbed power in flip-chip bonded UHF radio frequency identification transponder ICs. For the de-embedding, four compact co-planar test fixtures, an equivalent circuit for the fixtures, and a parameter extraction procedure for...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    OPRoS: A New Component-Based Robot Software Platform

    A component is a reusable and replaceable software module accessed through its interface. Component-based development is expected to shorten the development period, reduce maintenance costs, and improve program reusability and the interoperability of components. This paper proposes a new robot software component platform in order to support the entire process...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Hardware-Aware Rate Monotonic Scheduling Algorithm for Embedded Multimedia Systems

    Many embedded multimedia systems employ special hardware blocks to co-process with the main processor. Even though an efficient handling of such hardware blocks is critical on the overall performance of real-time multimedia systems, traditional real-time scheduling techniques cannot afford to guarantee a high quality of multimedia playbacks with neither delay...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Content Protective Multi-Agent Platform for MsMu Service and Pattern-Based Content Management

    Recent research on mobile Internet protocol television and Digital Right Management (DRM) interconnections has focused on multimedia technologies designed to enhance content scalability and adaptive content distribution. However, due to the architectural and scalable limitations, recent systems are not flexible and securable with respect to their adaptive content distribution and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    A Novel Approach for Mining High-Utility Sequential Patterns in Sequence Databases

    Mining sequential patterns is an important research issue in data mining and knowledge discovery with broad applications. However, the existing sequential pattern mining approaches consider only binary frequency values of items in sequences and equal importance/significance values of distinct items. Therefore, they are not applicable to actually represent many real-world...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Virtual Reality Content-Based Training for Spray Painting Tasks in the Shipbuilding Industry

    Training is one of the representative application fields of virtual reality technology where users can have virtual experience in a training task and working environment. Widely used in the medical and military fields, virtual reality-based training systems are also useful in industrial fields, such as the aerospace industry, since they...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    A Robust Mutual Authentication Protocol for Wireless Sensor Networks

    Authentication is an important service in Wireless Sensor Networks (WSNs) for an unattended environment. Recently, Das proposed a hash-based authentication protocol for WSNs, which provides more security against the masquerade, stolen-verifier, replay, and guessing attacks and avoids the threat which comes with having many logged-in users with the same login-id....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Disguised-Face Discriminator for Embedded Systems

    In this paper, the authors introduce an improved Adaptive Boosting (AdaBoost) classifier and its application, a disguised-face discriminator that discriminates between bare and disguised faces. The proposed classifier is based on an AdaBoost learning algorithm and regression technique. In the process, the lookup table of AdaBoost learning is utilized. The...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2011

    Handover Ranging Power Adjustment Using Uplink Channel Information in IEEE 802.16e/m

    This paper proposes a handover ranging power adjustment scheme to improve handover performance. Incorrect ranging power can degrade handover performance due to the increased handover latency; therefore, the proposed scheme exploits the uplink channel information to adjust the uplink handover ranging power. Simulation results demonstrate that the proposed scheme reduces...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Joint Channel Coding Based on Principal Component Analysis

    This paper proposes a new joint channel coding algorithm based on principal component analysis. A conventional joint channel coder using passive downmixing undergoes a reduction of both the Primary-to-Ambient energy Ratio (PAR) of the downmix signal and the panning gain ratio of the primary source. The proposed system preserves the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Design and Implementation of a Latency Efficient Encoder for LTE Systems

    The operation time of an encoder is one of the critical implementation issues for satisfying the timing requirements of Long Term Evolution (LTE) systems because the encoder is based on binary operations. In this paper, the authors propose a design and implementation of a latency efficient encoder for LTE systems....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Low-Cost High-Performance TDD Synchronizer for WiBro RF Repeater

    WiBro Radio Frequency (RF) repeater is used for solving the problem of partial shadow areas in the wireless communication field that uses Time-Division Duplexing (TDD) mode. In this paper, a method to efficiently generate TDD signals for WiBro RF repeater is proposed and its digital circuit is implemented. A TDD...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Adaptive Cooperative Spectrum Sharing Based on Fairness and Total Profit in Cognitive Radio Networks

    A cooperative model is presented to enable sharing of the spectrum with secondary users. Compared with the optimal model and competitive model, the cooperative model could reach the maximum total profit for secondary users with better fairness. The cooperative model is built based on the Nash equilibrium. Then a conceding...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    On-Chip Bus Serialization Method for Low-Power Communications

    One of the critical issues in on-chip serial communications is increased power consumption. In general, serial communications tend to dissipate more energy than parallel communications due to bit multiplexing. This paper proposes a low-power bus serialization method. This encodes bus signals prior to serialization so that they are converted into...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2008

    Analysis of the Competitiveness of Broadband Over Power Line Communication in Korea

    This paper analyzes factors affecting the competitiveness of Broadband over Power Line Communication (BPLC) and predicts demand for the service, based on quantitative information about consumer preferences drawn from a survey of Korean consumers. Findings from the estimation suggest that, although consumers value some beneficial features of BPLC, to be...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2008

    Memory-Efficient Hypercube Key Establishment Scheme for Micro-Sensor Networks

    A micro-sensor network is comprised of a large number of small sensors with limited memory capacity. Current key-establishment schemes for symmetric encryption require too much memory for micro-sensor networks on a large scale. In this paper, the authors propose a memory-efficient hypercube key establishment scheme that only requires logarithmic memory...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2008

    A Scheme to Increase Throughput in Framed-ALOHA-Based RFID Systems With Capture

    In this paper, a scheme to increase the throughput of RFID systems is presented, which considers the capture effect in the context of framed ALOHA protocol. Under the capture model in which the probability of one tag is identified successfully depending on the number of tags involved in the collision,...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2008

    Compact Dipole Antenna for Terrestrial Digital Multimedia Broadcasting Service

    Rapid progress in TV broadcasting technology offers high quality broadcasting services for portable devices, such as the mobile phone, electronic notebook, and PDA. In particular, Terrestrial Digital Multimedia Broadcasting (TDMB) service was initiated for various mobile devices in Korea. TDMB can provide seamless high-quality audio, video, and data services. Since...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    Harmonic Identification Algorithms Based on DCT for Power Quality Applications

    The increasing demand for non-sinusoidal currents affects the quality of distribution networks. Harmonic detection is a crucial step in the cancellation of those components by active power filters. In this paper, the Discrete Cosine Transform (DCT) is compared with different implementations based on Fourier transforms, demonstrating their equivalences and the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    Improvement of Ultra-Wideband Link Performance Over Bands Requiring Interference Mitigation in Korea

    Ultra-WideBand (UWB) systems have witnessed a debate over whether they may cause interference to other existing and future narrowband systems sharing their band of operation. The Detect And Avoid (DAA) mechanism was developed as a solution to reduce interference to narrowband systems in order to ease regulatory concerns. It works...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    Electronic Feedback System for Stabilization of Fiber Ring Resonator

    The authors propose a simple technique to stabilize the optical output intensity of a fiber ring resonator. The electronic feedback circuit system, which consists of two voltage control oscillators, a phase comparator, and a low pass filter, is applied to the fiber ring resonator in order to compensate the optical...

    Provided By Electronics and Telecommunication Research Institute