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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of information and communication convergence engineering
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The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 8, Issue 6 - Dec 2010
Volume 8, Issue 5 - Oct 2010
Volume 8, Issue 4 - Aug 2010
Volume 8, Issue 3 - Jun 2010
Volume 8, Issue 2 - Apr 2010
Volume 8, Issue 1 - Feb 2010
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Self-Organizing Map for Blind Channel Equalization
Han, Soo-Whan ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 609~617
DOI : 10.6109/jicce.2010.8.6.609
This paper is concerned with the use of a selforganizing map (SOM) to estimate the desired channel states of an unknown digital communication channel for blind equalization. The modification of SOM is accomplished by using the Bayesian likelihood fitness function and the relation between the desired channel states and channel output states. At the end of each clustering epoch, a set of estimated clusters for an unknown channel is chosen as a set of pre-defined desired channel states, and used to extract the channel output states. Next, all of the possible desired channel states are constructed by considering the combinations of extracted channel output states, and a set of the desired states characterized by the maximal value of the Bayesian fitness is subsequently selected for the next SOM clustering epoch. This modification of SOM makes it possible to search the optimal desired channel states of an unknown channel. In simulations, binary signals are generated at random with Gaussian noise, and both linear and nonlinear channels are evaluated. The performance of the proposed method is compared with those of the "conventional" SOM and an existing hybrid genetic algorithm. Relatively high accuracy and fast search speed have been achieved by using the proposed method.
DDoS Correspondence Index for Evaluating Performance Management
Kim, Hyung-Won ; Lee, Nam-Yong ; Kim, Jong-Bae ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 618~622
DOI : 10.6109/jicce.2010.8.6.618
The damages from DDoS attacks are increasing as DDoS attacks are taking various forms. This has resulted not only in decreased reliability of organizations and corporations but also in the threat of national security. Organizations and corporations are making significant efforts in developing a system through which they can appropriately correspond to DDoS attacks. However, the studies on objective index for evaluating the performance of DDoS correspondence are lacking. The majority of the existing studies have been on the information protection & management system on a large scale. Accordingly, the scope of this thesis will be limited to DDoS correspondence to propose correspondence index for quantitatively measuring and managing them. The statistical techniques such as SMART technique and factor analysis will be utilized accordingly.
An Effective Route Selection Scheme with Considering Traffic Density in VANET
An, Do-Sik ; Cho, Gi-Hwan ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 623~629
DOI : 10.6109/jicce.2010.8.6.623
A geographical routing protocol is typically utilized for a route selection of VANET. Even if it is conceptually well adapted into VANET, message delivery tends to be unreliable with frequent network partitions, which mainly come from the inherent characteristics such as high mobility and irregular traffic density. In this paper, we deal with a method to enable reliable message delivery with reflecting the traffic density on routing decision. By concatenating the message delivery cost of each of inbetween junction section,
shortest paths are initially determined. When it is not possible to deliver the message on a junction on the 1st path, we utilize two novel ideas, that is, letting the message stay on the junction to find out a new relay node, and putting a replicated copy to reach via a detour path. By using the NS-2 network simulator, our method has been examined in terms of message delivery rate and delay. It shows that our method is much efficient than the other method in the low density environment, while it brings similar results in the high density environment.
Design and Implementation of Internal Multi-Band Folded Monopole Antenna for Mobile Handset Applications
Yoo, Joo-Bong ; Yang, Woon-Geun ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 630~634
DOI : 10.6109/jicce.2010.8.6.630
In this paper, we designed and fabricated a multi-band folded monopole antenna for mobile handsets that can be used for multiple services. The proposed antenna, with a small size of
can provide sufficient bandwidth to cover the GSM900 (Global System for Mobile Communications: 880-960 MHz), DCS (Digital Cellular System: 1710-1880 MHz), K-PCS (Korea-Personal Communication Service: 1750-1870 MHz), Wibro (2300-2390 MHz) and Bluetooth (2400-2483 MHz) bands.
A Novel Compact CPW-fed Antenna with Multi-resonance Mode
Choi, Hyo-Sub ; Ko, Jae-Jin ; Lee, Chul-Dong ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 635~639
DOI : 10.6109/jicce.2010.8.6.635
A multi-resonance antenna for wireless communications is reported. By using double inverted-L strips, the antenna demonstrated compact size (15 mm
14 mm) including the ground, multi-band operation for IEEE 802.11 a/b/g/p applications, and wide bandwidth of 1.7 GHz at 5 GHz band. Good radiation features of omni-directional patterns and 1.98 and 2.29 dBi peak antenna gains for the lower and upper bands, respectively, have been achieved.
An Echo Canceller Robust to Noise and Residual Echo
Kim, Hyun-Tae ; Park, Jang-Sik ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 640~644
DOI : 10.6109/jicce.2010.8.6.640
When we talk with hands-free in a car or noisy lobby, the performance of the echo canceller degrade because background noise added to echo caused by the distance from mouth to microphone is relatively long. It gives a reason for necessity of noise-robust and high convergence speed adaptive algorithm. And if acoustic echo canceller operated not perfectly, residual signal going through the echo canceller to far-end speaker remains residual echo, which degrade quality of talk. To solve this problem, post-processing needed to remove residual echo ones more. In this paper, we propose a new acoustic echo canceller, which has noise robust and high convergence speed, linked with linear predictor as a post-processor. By computer simulation, it is confirmed that the proposed algorithm shows better performance from acoustic interference cancellation (AIC) viewpoint.
A New Depth and Disparity Visualization Algorithm for Stereoscopic Camera Rig
Ramesh, Rohit ; Shin, Heung-Sub ; Jeong, Shin-Il ; Chung, Wan-Young ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 645~650
DOI : 10.6109/jicce.2010.8.6.645
In this paper, we present the effect of binocular cues which plays crucial role for the visualization of a stereoscopic or 3D image. This study is useful in extracting depth and disparity information by image processing technique. A linear relation between the object distance and the image distance is presented to discuss the cause of cybersickness. In the experimental results, three dimensional view of the depth map between the 2D images is shown. A median filter is used to reduce the noises available in the disparity map image. After the median filter, two filter algorithms such as 'Gabor' filter and 'Canny' filter are tested for disparity visualization between two images. The 'Gabor' filter is to estimate the disparity by texture extraction and discrimination methods of the two images, and the 'Canny' filter is used to visualize the disparity by edge detection of the two color images obtained from stereoscopic cameras. The 'Canny' filter is better choice for estimating the disparity rather than the 'Gabor' filter because the 'Canny' filter is much more efficient than 'Gabor' filter in terms of detecting the edges. 'Canny' filter changes the color images directly into color edges without converting them into the grayscale. As a result, more clear edges of the stereo images as compared to the edge detection by 'Gabor' filter can be obtained. Since the main goal of the research is to estimate the horizontal disparity of all possible regions or edges of the images, thus the 'Canny' filter is proposed for decipherable visualization of the disparity.
Power Randomization Schemes for Random Beamforming Based MIMO Systems
Jung, Bang-Chul ; Sung, Kil-Young ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 651~654
DOI : 10.6109/jicce.2010.8.6.651
In this paper, we propose two power randomization schemes for the random beamforming (RBF) based MIMO systems in cellular downlink. In the proposed system, a BS randomizes not only the pre-coding matrix but also the power allocation matrix, while the conventional RBF system allocates an equal power to each transmit stream. The proposed water-filling based power randomization scheme (Scheme-I) is proper in the low SNR values and the proposed random-power based randomization scheme (Scheme-II) is proper in the high SNR values. The proposed system with the power randomization outperforms the conventional RBF system which allocates the same power for each data stream.
A Practical Physical-Layer Network Coding for Fading Channels
Jung, Bang-Chul ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 655~659
DOI : 10.6109/jicce.2010.8.6.655
In the conventional PNC scheme, the relay node requires simultaneous transmission of two source nodes with strict power control and carrier-phase matching between two received symbols. However, this pre-equalization process at source nodes is not practical in fading channels. In this letter, we propose a novel physical-layer network coding (PNC) scheme with log-likelihood ratio (LLR) conversion for fading channels, which utilizes not pre-equalizer at transmitters (source nodes) but joint detector at receiver (relay node). The proposed PNC requires only channel side information at the receiver (CSIR), which is far more practical assumption in fading channels. In addition, the proposed PNC scheme can use the conventional modulation scheme like M-QAM regardless of modulation order, while the conventional PNC scheme requires reconfiguration of modulation scheme at the source nodes for detection of the received signal at relay node. We consider the combination of the proposed PNC and channel coding, and find that the proposed PNC scheme is easily combined the linear channel codes such as turbo codes, LDPC, and convolutional codes.
Proportional Backoff Scheme for Data Services in TDMA-based Wireless Networks
Lim, In-Taek ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 660~664
DOI : 10.6109/jicce.2010.8.6.660
This paper proposes a backoff control scheme for guaranteeing fair packet transmissions in TDMA wireless networks. In order to maximize the system performance, the number of packets transmitted in a frame should be kept at a proper level. In the proposed scheme, the base station calculates the packet transmission probability according to the offered loads and then broadcasts to all the mobile stations. Mobile stations attempt to transmit a packet with the received probability. Simulation results show that the proposed scheme can offer better system throughput and delay performance than the conventional one regardless of the offered loads.
A Design and Implementation of the Remote Control Black Box System of Vehicle Using the Smart Phone
Song, Jong-Geun ; Jang, Won-Tae ; Kim, Tae-Yong ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 665~670
DOI : 10.6109/jicce.2010.8.6.665
This paper suggests the vehicle remote control on the basis of Smart Phone. In general, most smart phone is mounted with G-sensor to control the motion. G-sensor is able to control several directions and movements of velocity along with X, Y, and Z axis. To access remote location and data system, we can also utilize Wi-Fi communication as well as bluetooth communication. In this study, we propose the scheme that is the car management application by remote control via real-time monitoring on mobile device for user convenience.
Design and Development of Meteorological Data Logger
Ng, Yin-Yeo ; Park, Soo-Hong ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 671~676
DOI : 10.6109/jicce.2010.8.6.671
In this paper, an effort has been made to design and develop a meteorological data logger for meteorological purpose. This data logger is proposed to be included various sensor interface that used in weather sensors. Besides, numbers of meteorological process libraries are added into this data logger to make it able to perform as unattended weather monitoring system. Data output of this data logger are also design to support multiple protocol that commonly used in data logger, and several communication devices that commonly used in the market. Each data that logged will be logged together with date and time and able to retrieve via serial port using hyper terminal. It is also configurable via serial port.
Transmission Probability Control Scheme in FSA-based RFID Systems
Lim, In-Taek ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 677~681
DOI : 10.6109/jicce.2010.8.6.677
This paper proposes a transmission probability control scheme for enhancing the performances of FSA-based RFID system. In order to maximize the system performance, the number of tags attempting to transmit their identifiers in a frame should be kept at a proper level. The reader calculates the transmission probability according to the number of tags within the identification range of reader and then broadcasts it to tags. Tags, in which their slot counter values reach to zero, attempt to transmit their identifiers with the received probability. Simulation results show that the proposed scheme can offer better throughput and delay performance than the conventional one regardless of the number of tags.
QoS-guaranteed Fast Wakeup and Connection Mechanism in Multi-Interface Communication Systems
Kim, Moon ; Park, Ki-Sik ; Kim, Wan-Tae ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 682~686
DOI : 10.6109/jicce.2010.8.6.682
In this paper, we propose the fast wakeup and connection mechanisms for various energy saving schemes in order to improve QoS. First, we offer the interconnection of heterogeneous access networks via the Media Independent Information Server/Service (MIIS). Then, we propose the fast wakeup and connection mechanism for multi-interface communication systems. The proposed novel mechanism focuses on the fast provision of incoming service destined to the interface currently in energy saving mode by using MIIS-assisted interconnection. We further evaluate the performance of proposed mechanism through the numerical and experimental analysis.
Performance Enhancement of Multi-Band OFDM using Spectrum Equalizer
Yoon, Sang-Hun ; Jung, Jun-Mo ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 687~689
DOI : 10.6109/jicce.2010.8.6.687
In this paper, the equalization for frequency slope of path loss in Multi-Band(MB) OFDM UWB is proposed. The path loss of a signal is proportionate to the square of the signal's frequency. So, the received signal amplitudes of OFDM subcarrier can be different up to 3dB when MB-OFDM occupies bandwidth over 1.5GHz. The differences of subcarrier-amplitudes make an effective of 0.3 bit reduction of soft decision bits of viterbi decoder, and when the effective of 0.3 bit reduction can cause 0.5dB SNR degradation. This paper proposes two modem architectures which compensate for the degraded subcarrier by multiplying the reciprocal of degraded values in analog or digital domain. It is shown that, for the proposed architecture applied to MB-OFDM UWB, the performance improvements up to 0.5dB can be obtained over the conventional uncompensated receiver architecture.
Multimedia Presentation Authoring and Virtual Collaboration in Medicine
Hong, Chul-Eui ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 690~696
DOI : 10.6109/jicce.2010.8.6.690
Web-based virtual collaboration is increasingly gaining popularity in almost every area in our society due to the fact that it can bridge the gap imposed by time and geographical constraints. However, in medical field, such collaboration has been less popular than other fields. Some of the reasons were timeliness, security, and preciseness of the information they are dealing with. In this paper, we are proposing a web-based distributed medical collaboration system called Virtual Collaboration System for Medicine (VCSM) for medical doctors that meet the needs. The proposed system consists of two parts - multimedia presentation and recordable virtual collaboration. The former supports synchronized multimedia presentation using Synchronous Multimedia Integration Language (SMIL.) It allows synchronization of the contents of a PowerPoint presentation file and a video file. The presentation may be provided to the participants before the discussion begins. Next, in the virtual collaboration stage, participants can use text along with associated symbols during the discussion over the presented medical images. The symbols such as arrows or polygons can be set or removed dynamically to represent areas of interest in digital images using so called layered architecture that separates image layer from annotation layer. XML files are used to record participants' opinions along with the symbols over some particular images
Segmentation and Appearance Features Index for Digital Video Data
Yun, Hong-Won ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 697~701
DOI : 10.6109/jicce.2010.8.6.697
The numbers of digital video cameras are fast increased. Accordingly, digital video data management is becoming more important. Efficient storing method and fast browsing method still remains to be one of significant issue. In this paper, an optimized data storing process without losing information and an organized appearance features indexing method are proposed. Also, the data removing policy could be used to reduce large amount of space and it facilitates fast sequential search. The appearance features index constructs key information of moving objects to answer queries about what people are doing, particularly when, where and who they move. The evaluation results showed better performance in the transfer time and the saving in storage space.
Linearization of T-S Fuzzy Systems and Robust Optimal Control
Kim, Min-Chan ; Wang, Fa-Guang ; Park, Seung-Kyu ; Kwak, Gun-Pyong ; Yoon, Tae-Sung ; Ahn, Ho-Kyun ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 702~708
DOI : 10.6109/jicce.2010.8.6.702
This paper proposes a novel linearization method for Takagi.sugeno (TS) fuzzy model. A T-S fuzzy controller consists of linear controllers based on local linear models and the local linear controllers cannot be designed independently because of overall stability conditions which are usually conservative. To use linear control theories easily for T-S fuzzy system, the linearization of T-S fuzzy model is required. However, The linearization of T-S fuzzy model is difficult to be achieved by using existing linearization methods because fuzzy rules and membership functions are included in T-S fuzzy models. So, a new linearization method is proposed for the T-S fuzzy system based on the idea of T-S fuzzy state transformation. For the T-S fuzzy system linearized with uncertainties, a robust optimal controller with the robustness of sliding model control(SMC) is designed.
A Correction System of Odometry Error for Map Building of Mobile Robot Based on Sensor fusion
Hyun, Woong-Keun ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 709~715
DOI : 10.6109/jicce.2010.8.6.709
This paper represents a map building and localization system for mobile robot. Map building and navigation is a complex problem because map integrity cannot be sustained by odometry alone due to errors introduced by wheel slippage, distortion and simple linealized odometry equation. For accurate localization, we propose sensor fusion system using encoder sensor and indoor GPS module as relative sensor and absolute sensor, respectively. To build a map, we developed a sensor based navigation algorithm and grid based map building algorithm based on Embedded Linux O.S. A wall following decision engine like an expert system was proposed for map building navigation. We proved this system's validity through field test.
An ASIC Implementation of Fingerprint Thinning Algorithm
Jung, Seung-Min ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 716~720
DOI : 10.6109/jicce.2010.8.6.716
This paper proposes an effective fingerprint identification system with hardware block for thinning stage processing of a verification algorithm based on minutiae with 39% occupation of 32-bit RISC microprocessor cycle. Each step of a fingerprint algorithm is analyzed based on FPGA and ARMulator. This paper designs an effective hardware scheme for thinning stage processing using the Verilog-HDL in
pixel array. The ZS algorithm is applied for a thinning stage. The logic is also synthesized in
4-metal CMOS process. The layout is performed based on an auto placement-routing and post-simulation is performed in logic level. The result is compared with a conventional one.
Buffer Management Algorithms in Unbounded Buffers
Kim, Jae-Hoon ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 721~724
DOI : 10.6109/jicce.2010.8.6.721
In a network router, packet loss may occur when it overflows due to sudden burst traffic. This paper studies how much large buffers are required to eliminate the packet losses. There are buffers on which packet arrive and one output port to which a packet is transmitted at a time. The buffer management algorithm should determine one of the buffers whose packet is transmitted to the output port at each time. The front packet belonging to the buffer determined by the algorithm is transmitted. The goal is to minimize the sum of the lengths of buffers to transmit all the packets. We provide an optimal off-line algorithm and also we show the lower bounds of on-line algorithms. The on-line algorithm has no prior information of the packets having arrived in the future. Its performance is compared to that of the optimal off-line algorithm.
A Study on the Interrelationship Between the Unconscious and Digital Images
Choi, Won-Ho ;
Journal of information and communication convergence engineering, volume 8, issue 6, 2010, Pages 725~728
DOI : 10.6109/jicce.2010.8.6.725
The subject collects information and constructs the outside world mainly through the sense of sight, though he cannot help but always see things from the viewpoint of the self-aware ego. While we are able to access the unconscious of which the latent desire is reflected in involuntary images and dream images, the substance of desire cannot be easily accessed due to the censorship of the ego and the super-ego, which makes images of the unconscious nonlinear, and allows us to pursue fantasies for pleasure. The original human desire to record and express visual objects has come true with technological fulfillments, and furthermore, digital technology has realized visual pleasure and desire, through simulation. The images that the unconscious produces and the images that digital technology produces are a visualization of objects by the subject's desire, and the subject realizes his pleasure through a visual fantasy. This study, based on the mechanism of the unconscious and the formal stamps of digital images, explores the interrelationship between the unconscious and digital images, both of which seek pleasure and desire.