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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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Institude of Korean Electrical and Electronics Engineers
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Volume & Issues
Volume 13, Issue 4 - Dec 2009
Volume 13, Issue 3 - Sep 2009
Volume 13, Issue 2 - Jun 2009
Volume 13, Issue 1 - Mar 2009
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Dynamically Reconfigurable SoC 3-Layer Bus Structure
Kim, Kyu-Chull ; Seo, Byung-Hyun ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 101~107
Growth in the VLSI process and design technology is resulting into a continuous increase in the number of IPs on a chip to form a system. Because of many IPs on a single chip, efficient communication between IPs is essential. We propose a dynamically reconfigurable 3-layer bus structure which can adapt to the pattern of data transmission to achieve an efficient data communication between various IPs. The proposed 3-layer bus can be reconfigured to multi-single bus mode, and single-multi bus mode, thus providing the benefits of both single-bus and multi-bus modes. Experimental results show that the flexibility of the proposed bus structure can reduce data transmission time compared to the conventional fixed bus structure. We incorporated the proposed bus structure in a JPEG system and verified that the proposed structure achieved an average of 22% improvement in time over the conventional fixed bus structure.
Reader Collision Avoidance Scheme for Mobile RFID-Sensor Integrated Networks
Ko, Doo-Hyun ; Kim, Song-Min ; Lee, Sang-Bin ; An, Sun-Shin ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 108~117
In recent years, one of alternatives for constructing RFID networks that provide mobile services is using wireless sensor networks (WSN) to enhance network capacity, utility and scalability. Due to absence of compatible reader anti-collision control and channel capture phenomenon, the medium access control protocols as used in the RFID networks lead to reader collision and starvation problem. In this paper, we develop a MAC protocol which is called Enhanced Collision Avoidance MAC (ECO) to avoid reader to reader collisions in an integrated RFID network. ECO is a CSMA-based MAC protocol, and operates on integrated nodes which consist of a RFID reader and a mote. Performance evaluation shows superior results to pure-CSMA protocols under dense deployment environments, both in number of failures and in throughput.
Design of a 0.18
m CMOS 10Gbps CDR With a Quarter-Rate Bang-Bang Phase Detector
Cha, Chung-Hyeon ; Ko, Seung-O ; Seo, Hee-Taek ; Park, Jong-Tae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 118~125
With recent advancement of high-speed, multi-gigabit data transmission capabilities, transmitters usually send data without clock signals for reduction of hardware complexity, power consumption, and cost. Therefore clock and data recovery circuits(CDR) become important to recover the clock and data signals and have been widely studied. This paper presents the design of 10Gbps CDR in 0.18
m CMOS process. A quarter-rate bang-bang phase detector is designed to reduce the power and circuit complexity, and a 4-stage LC-type VCO is used to improve the jitter characteristics. Simulation results show that the designed CDR consumes 80mW from a 1.8V supply, and exhibits a peak-to-peak jitter of 2.2ps in the recovered clock. The chip layout area excluding pads is 1.26mm
Fabrication of wrap-around gate nanostructures from electrochemical deposition
Ahn, Jae-Hyun ; Hong, Su-Heon ; Kang, Myung-Gil ; Hwang, Sung-Woo ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 126~131
To overcome short channel effects, wrap-around field effect transistors have drawn a great deal of attention for their superior electrostatic coupling between the channel and the surrounding gate electrode. In this paper, we introduce a bottom-up technique to fabricate a wrap-around field effect transistor using silicon nanowires as the conduction channel. Device fabrication was consisted mainly of electron-beam lithography, dielectrophoresis to accurately align the nanowires, and the formation of gate electrode using electrochemical deposition. The electrolyte for electrochemical deposition was made up of non-toxic organic-based solution and liquid nitrogen was used as a method of maintaining the shape of polymethyl methacrylate(PMMA) during the process of electrochemical deposition. Patterned PMMA can be used as a nano-template to produce wrap-around gate nano-structures.
Speech Feature based Double-talk Detector for Acoustic Echo Cancellation
Park, Jun-Eun ; Lee, Yoon-Jae ; Kim, Ki-Hyeon ; Ko, Han-Seok ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 132~139
In this paper, a speech feature based double-talk detector method is proposed for an acoustic echo cancellation in hands-free communication system. The double-talk detector is an important element, since it controls the update of the adaptive filter for an acoustic echo cancellation. In previous research, the double talk detector is considered in the signal processing stage without taking the speech characteristics into account. However, in the proposed method, speech features which are used for the speech recognition is used for the discriminative features between the far-end and near-end speech. We obtained a substantial improvement over the previous double-talk detector methods using the only signal in time domain.
Traffic Anomaly Detection for Campus Networks using Fisher Linear Discriminant
Park, Hyun-Hee ; Kim, Mee-Joung ; Kang, Chul-Hee ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 140~149
Traffic anomaly detection is one of important technology that should be considered in network security and administration. In this paper, we propose an abnormal traffic detection mechanism that includes traffic monitoring and traffic analysis. We develop analytical passive monitoring system called WISE-Mon which can inspect traffic behavior. We establish a criterion by analyzing the characteristics of a traffic training set. To detect abnormal traffic, we derive a hyperplane by using Fisher linear discriminant and chi-square distribution as well as the analyzed characteristics of traffic. Our mechanism can support reliable results for traffic anomaly detection and is compatible to real-time detection. In addition, since the trend of traffic can be changed as time passes, the hyperplane has to be updated periodically to reflect the changes. Accordingly, we consider the self-learning algorithm which reflects the trend of the traffic and so enables to increase the pliability of detection probability. Numerical results are presented to validate the accuracy of proposed mechanism. It shows that the proposed mechanism is reliable and relevant for traffic anomaly detection.
Sensor Based Path Planning and Obstacle Avoidance Using Predictive Local Target and Distributed Fuzzy Control in Unknown Environments
Kwak, Hwan-Joo ; Park, Gwi-Tae ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 150~158
For the autonomous movement, the optimal path planning connecting between current and target positions is essential, and the optimal path of mobile robot means obstacle-free and the shortest length path to a target position. Many actual mobile robots should move without any information of surrounded obstacles. Thus, this paper suggests new methods of path planning and obstacle avoidment, suitable in unknown environments. This method of path planning always tracks the local target expected as the optimal one, and the result of continuous tracking becomes the first generated moving path. This path, however, do not regard the collision with obstacles. Thus, this paper suggests a new method of obstacle avoidance resembled with the Potential Field method. Finally, a simulation confirms the performance and correctness of the path planning and obstacle avoidance, suggested in this paper.
Emotion Transition Model based Music Classification Scheme for Music Recommendation
Han, Byeong-Jun ; Hwang, Een-Jun ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 159~166
So far, many researches have been done to retrieve music information using static classification descriptors such as genre and mood. Since static classification descriptors are based on diverse content-based musical features, they are effective in retrieving similar music in terms of such features. However, human emotion or mood transition triggered by music enables more effective and sophisticated query in music retrieval. So far, few works have been done to evaluate the effect of human mood transition by music. Using formal representation of such mood transitions, we can provide personalized service more effectively in the new applications such as music recommendation. In this paper, we first propose our Emotion State Transition Model (ESTM) for describing human mood transition by music and then describe a music classification and recommendation scheme based on the ESTM. In the experiment, diverse content-based features were extracted from music clips, dimensionally reduced by NMF (Non-negative Matrix Factorization, and classified by SVM (Support Vector Machine). In the performance analysis, we achieved average accuracy 67.54% and maximum accuracy 87.78%.
Sequence-based Similar Music Retrieval Scheme
Jun, Sang-Hoon ; Hwang, Een-Jun ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 167~174
Music evokes human emotions or creates music moods through various low-level musical features. Typical music clip consists of one or more moods and this can be used as an important criteria for determining the similarity between music clips. In this paper, we propose a new music retrieval scheme based on the mood change patterns of music clips. For this, we first divide music clips into segments based on low level musical features. Then, we apply K-means clustering algorithm for grouping them into clusters with similar features. By assigning a unique mood symbol for each cluster, we can represent each music clip by a sequence of mood symbols. Finally, to estimate the similarity of music clips, we measure the similarity of their musical mood sequence using the Longest Common Subsequence (LCS) algorithm. To evaluate the performance of our scheme, we carried out various experiments and measured the user evaluation. We report some of the results.
A Study on Optimal Design of Photovoltaic System for Efficiency Progress
Choi, Young-Moon ; Lim, Jung-Yol ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 175~180
This paper compare the operation characteristic and optimal design of Photovoltaic system by computer simulation. The operation characteristic of Photovoltaic system are evaluated and analyzed considering system parameters of specifications, installations, inclination, azimuth and surrounding conditions etc. From the basis of these results, this study will intend to develop an evaluation, analysis tool and construct database for optimal design of PV system.
3D Line Segment Extraction Based on Line Fitting of Elevation Data
Woo, Dong-Min ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 181~185
In this paper, we are concerned with a 3D line segment extraction method by area-based stereo matching technique. The main idea is based on line fitting of elevation data on 2D line coordinates of ortho-image. Elevation data and ortho-image can be obtained by well-known area-based stereo matching technique. In order to use elevation in line fitting, the elevation itself should be reliable. To measure the reliability of elevation, in this paper, we employ the concept of self-consistency. We test the effectiveness of the proposed method with a quantitative accuracy analysis using synthetic images generated from Avenches data set of Ascona aerial images. Experimental results indicate that our method generates 3D line segments almost 7.5 times more accurate than raw elevations obtained by area-based method.
A Study on Unified Security Management System for remote data acquisition of New and Renewable Energy Facilities
Kim, Hyoung-Ju ; Lim, Jung-Yol ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 186~193
Development and diffusion of a new and renewable energy are acutely required at domestic energy actualities to be inferior as industrialization is accelerated, and use of information electric appliance is increased rapidly. For the diessemination and practical use of new and renewable energy, this paper presents an unified security management system that is efficiently able to acquire operational status date and control distributed generation facilities. Also, the unified security management system is suggested to protect gathered operational status date from unpredictable problems such as computer virus, spy ware, and any other network problems.
Development of Optimum Parameters Sampling Program for Mica Capacitor Design
Kim, Jae-Wook ; Ryu, Chang-Keun ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 194~199
In this study, ultra high-voltage (170kV AC), reliable 80pF mica capacitors for partial discharge system application were investigated. For capacitors design, Program was developed to sampling of series and parallel parameters. Mica was used as the dielectric of the capacitors. Using the conservative design rule, over 3 individual 50
m thick mica sheets with a size of 30mm
35mm were used with lead foils to form a parallel capacitor element and 20 mica sheets were interleaved with lead foils to form a series stack of parallel capacitor element to meet the requirements of the capacitors. The dimension of the fabricated 80pF capacitor for 17kV AC were 90mm
90mm. The high-frequency characteristics of the capacitance (C) and dissipation factor (D) of the developed capacitors were measured using a capacitance meter. The developed capacitor exhibited C of 79.5pF, had D of 0.001% over the frequency ranges of 150kHz to 50MHz, had a self-resonant frequency of 65MHz.
The Network Designs And Traffic Grooming Algorithm to Maximize the Throughput in WDM Ring Networks
Yoon, Seung-Jin ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 200~207
In this paper, novel traffic gromming algorithms are proposed with a primary goal of maximize the throughput in WDM(Wavelength Division Multiplexing) ring networks. To achieve this goal, we analyze two network designs that are Lightpath Designs and Virtual Topology Designs and simulate the throughput in various traffic environments. From this methods, we propose novel traffic gromming algorithms to maximize the throughput.
A design of the high efficiency PMIC with DT-CMOS switch for portable application
Ha, Ka-San ; Lee, Kang-Yoon ; Ha, Jae-Hwan ; Ju, Hwan-Kyu ; Koo, Yong-Seo ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 208~215
The high efficiency power management IC(PMIC) with DT-CMOS(Dynamic Threshold voltage MOSFET) switching device for portable application is proposed in this paper. Because portable applications need high output voltages and low output voltage, Boost converter and Buck converter are embedded in One-chip. PMIC is controlled with PWM control method in order to have high power efficiency at high current level. DTMOS with low on-resistance is designed to decrease conduction loss. Boost converter and Buck converter, are based on Voltage-mode PWM control circuits and low on-resistance switching device, achieved the high efficiency near 92.1% and 95%, respectively, at 100mA output current. And Step-down DC-DC converter in stand-by mode below 1mA is designed with LDO in order to achive high efficiency.
Nanowire/PVA (Polyvinyl Alcohol) Composites for the Electric Applications
Lee, Jae-Woo ; Lee, Kang-Ho ; Kim, Gyu-Tae ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 216~219
nanowire / polyvinyl alcohol (PVA) polymer composite fibers were fabricated by a new simple method. The reaction of PVA and acetone facilitates the formation of the polymer membrane which can be used to make the fiber. Composite fiber is percolative in the conductance because of the low percolation threshold in
nanowire networks. The fiber composite can be applied to the electromagnetic shielding originating from the conductive nature.
A Simple Dual-Antenna Diversity Gain Measurement System at 2.4GHz
Kim, Jin-Gyong ; Chung, Kyung-Ho ; Ho, Yo-Choul ; Kim, Moon-Il ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 220~223
A simple measurement system is built to estimate the dual-antenna diversity gain at 2.4GHz easily in open lab environment. To obtain multipath fading propagation channel, the system consists of two transmission horn that placed on opposite direction and a rotating stage mechanically changing the position of test dual-antenna with time over distance greater than one wavelength. Estimated diversity is nearly same as theoretical value such that measured diversity gain of 30mm separated is about 6dB similar to theoretical value of 5.7dB and increases monotonically with the increasing separation distance as predicted by the theory. Proposed measurement system that is simple enough to fit in a small space can evaluate the performance of various dual-antennas with a reasonable accuracy with lower 5% difference between the ten sets of measured waveform distribution and theoretical Rayleigh cumulative distribution.
Unsharp masking based on the vector projection for removing color distortion
Lee, Kwang-Wook ; Dan, Byung-Kyu ; Kim, Seung-Kyun ; Ko, Sung-Jea ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 224~231
Unsharp masking is a popular image enhancement technique used to sharpen an image appearance in gray images. However, the conventional unsharp making techniques amplify the noise and easily cause overshoot artifacts. Moreover, the unsharp masking tends to introduce color distortion when it is applied to the each color component independently. To solve these problems, we propose a novel unsharp masking technique based on human visual system and vector projection. The proposed algorithm consists of two steps. First, the proposed algorithm controls the level of sharpening by exploiting the characteristics of the human visual system and contrast region. Then the vector projection is applied to remove the color distortion. Experiment results show that our proposed algorithm successfully produces sharpened images that are free of noise and color distortion commonly found in the conventional unsharp masking algorithms.
A vehicle detection and tracking algorithm for supervision of illegal parking
Kim, Seung-Kyun ; Kim, Hyo-Kak ; Zhang, Dongni ; Park, Sang-Hee ; Ko, Sung-Jea ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 232~240
This paper presents a robust vehicle detection and tracking algorithm for supervision of illegal parking. The proposed algorithm is composed of four parts. First, a vehicle detection algorithm is proposed using the improved codebook object detection algorithm to segment moving vehicles from the input sequence. Second, a preprocessing technique using the geometric characteristics of vehicles is employed to exclude non-vehicle objects. Then, the detected vehicles are tracked by an object tracker which incorporates histogram tracking method with Kalman filter. To make the tracking results more accurate, histogram tracking results are used as measurement data for Kalman filter. Finally, Real Stop Counter (RSC) is introduced for trustworthy and accurate performance of the stopped vehicle detection. Experimental results show that the proposed algorithm can track multiple vehicles simultaneously and detect stopped vehicles successfully in the complicated street environment.
Dynamic Expansion of Semantic Dictionary for Topic Extraction in Automatic Summarization
Choo, Kyo-Nam ; Woo, Yo-Seob ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 241~247
This paper suggests the expansion methods of semantic dictionary, taking Korean semantic features account. These methods will be used to extract a practical topic word in the automatic summarization. The first is the method which is constructed the synonym dictionary for improving the performance of semantic-marker analysis. The second is the method which is extracted the probabilistic information from the subcategorization dictionary for resolving the syntactic and semantic ambiguity. The third is the method which is predicted the subcategorization patterns of the unregistered predicate, for the resolution of an affix-derived predicate.
A development of noise improvement dc-dc converter for PM OLED module
Park, Sung-Joon ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 248~252
In this paper, analysis of a noise factor and an effective power strategy for the OLED dc-dc converter are described. One of the main reasons that one may not design the OLED power for dc-dc converter is that OLED's panel noise is composed of FFN(Frame Frequency Noise) and LFN(Line Frequency Noise). Into the bargain, FFN is caused by both the dc-dc (circuit) and driving circuit. It is hard to get rid of FFN, baeause FFN has very little results value for our ears. LFN is adjusted by analog compensation value. Actually, that is more important problem than FFN. It is known that voltage divider for OLED's mode variation is not good for compact power design. In the end, a circuit design for understanding OLED's noise and a novel muti-channel dc-dc converter were presented.
A Fully Programmable Shader Processor for Low Power Mobile Devices
Jeong, Hyung-Ki ; Lee, Joo-Sock ; Park, Tae-Ryong ; Lee, Kwang-Yeob ;
Journal of IKEEE, volume 13, issue 2, 2009, Pages 253~259
In this paper, we propose a novel architecture of a general graphics shader processor without a dedicated hardware. Recently, mobile devices require the high performance graphics processor as well as the small size, low power. The proposed shader processor is a GP-GPU(General-Purpose computing on Graphics Processing Units) to execute the whole OpenGL ES 2.0 graphics pipeline by using shader instructions. It does not require the separate dedicate H/W such as rasterization on this fully programmable capability. The fully programmable 3D graphics shader processor can reduce much of the graphics hardware. The chip size of the designed shader processor is reduced 60% less than the sizes of previous processors.