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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of information and communication convergence engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 3, Issue 4 - Dec 2005
Volume 3, Issue 3 - Nov 2005
Volume 3, Issue 2 - Jun 2005
Volume 3, Issue 1 - Mar 2005
Selecting the target year
Study on the Diversity Method to Improve the Performance of the CDMA System in the Mobile Wireless Channel
Lee Kwan-Houng ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 1~4
This study proposes a new diversity algorithm to improve the signal-to-noise ratio. In the wireless channel, if fading occurs due to the multipaths, the performance of the system is apparently reduced. One of the methods to reduce fadings like this is the diversity method, and this study aims to improve the performance of the system by proposing a new diversity algorithm. This study applied rake receiver, and normalized the wireless channel from the Nakagami fading channel to the Rayleigh fading channel, which set the fading index as 1, because of the multipaths. It applied QPSK and OQPSK modulation methods and applied the convolutional codes, where the code rate is 1/2 and 1/3 and the constraint length is 9, and the turbo code where the constraint length is 4. Under these conditions, this study compared and analyzed the average error probability of direct spread multiple access system. The diversity algorithm proposed in this paper could be applied to the mobile communication and other wireless multimedia communications that require high quality and high reliability.
Dynamic Network using Symmetric Block Cipher
Park Jong-Min ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 5~8
Dynamic cipher has the property that the key-size, the number of round, and the plaintext-size are scalable simultaneously. We present the method for designing secure Dynamic cipher against meet-in-the-middle attack and linear cryptanalysis. Also, we show that the differential cryptanalysis to Dynamic cipher is hard. In this paper we propose a new network called Dynamic network for symmetric block ciphers.
Vibration & Noise Analysis System in Wireless Environment
Shin Seung-jung ; Ryu Dae-hyun ; Na Jong-Whoa ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 9~12
In this research, we developed a ubiquitous computing platform that can analyze the vibration and noise in wireless environment by wireless LAN and sensors. In order to utilize the COTS(Commercial Off The Shelf) concept, we used a PDA that supports wireless LAN and serial communication as a main board. Following platform is used to measure the noise level of heavy construction equipments in a remote area.
Advanced Frame Distribution Method Using Padding for Link Aggregation between 10GbE Switches
Lee Soong-Hee ; Jeon Hyoung-Goo ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 13~17
The link e daggregation between 10GbE switches requires an advanced framistribution method to be properly and efficiently applied. The fixed or dynamic frame distribution methods, formerly proposed, cannot fully utilize the aggregated links, where the receiving terminal only attaches to a pre-specified link among multiple physical links. A frame distribution method using padding is proposed for the link aggregation between 10GbE switches to solve this problem. We compared the performance of the proposed method with those of the static and dynamic frame distribution methods. As a result, the proposed method shows a better performance when the offered load is below 0.7 and the average length of the frames is longer than 954 bytes.
A Low Jitter and Fast Locking Phase-Lock Loop with Adaptive Bandwidth Controller
Song Youn-Gui ; Choi Young-Shig ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 18~22
This paper presents the analog adaptive phase-locked loop (PLL) architecture with a new adaptive bandwidth controller to reduce locking time and minimize jitter in PLL output for wireless communication. It adaptively controls the loop bandwidth according to the locking status. When the phase error is large, the PLL increases the loop bandwidth and reduces locking time. When the phase error is small, the PLL decreases the loop bandwidth and minimizes output jitters. The adaptive bandwidth control is implemented by controlling charge pump current depending on the locking status. A 1.28-GHz CMOS phase-locked loop with adaptive bandwidth control is designed with 0.35
m CMOS technology. It is simulated by HSPICE and achieves the primary reference sidebands at the output of the VCO are approximately -80dBc.
Comparison of Resonance Characteristics of ZnO-Based FBAR Devices for Various Thermal-Annealing Conditions
Song Hae-i1 ; Mai Linh ; Yoon Giwan ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 23~27
In this paper, the effects of various annealing conditions on the resonance characteristics of ZnO-based FBAR devices are compared. Several FBAR device samples were fabricated by using three different annealing methods while one sample remained non-annealed as a reference for comparison. Return loss (
) could be significantly improved by both Bragg reflector-annealing and/or post-annealing. Especially, the use of the combined annealings resulted in most desirable resonance improvement compared with the Bragg reflector-annealing or post-annealing method alone.
A High-Frequency Signal Test Method for Embedded CMOS Op-amps
Kim Kang Chul ; Han Seok Bung ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 28~32
In this paper, we propose a novel test method to effectively detect hard and soft faults in CMOS 2-stage op-amps. The proposed method uses a very high frequency sinusoidal signal that exceeds unit gain bandwidth to maximize the fault effects. Since the proposed test method doesn't require any complex algorithms to generate the test pattern and uses only a single test pattern to detect all target faults, therefore test costs can be much reduced. The area overhead is also very small because the CUT is converted to a unit gain amplifier. Using HSPICE simulation, the results indicated a high degree of fault coverage for hard and soft faults in CMOS 2-stage op-amps. To verify this proposed method, we fabricated a CMOS op-amp that contained various short and open faults through the Hyundai 0.65-um 2-poly 2-metal CMOS process. Experimental results for the fabricated chip have shown that the proposed test method can effectively detect hard and soft faults in CMOS op-amps.
A Study on the Configuration Control of a Mobile Manipulator Based on the Optimal Cost Function
Kang Jin-Gu ; Lee Kwan-Houng ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 33~37
One of the most important feature of the Mobile Manipulator is redundant freedom. Using the redundant freedom, Mobile Manipulator can move various mode, perform dexterous motion. In this paper, to improve robot job ability, as two robots perform a job in co-operation control, we studied optimal position and posture of Mobile Manipulator with minimum movement of each robot joint. Kinematics of mobile robot and task robot is solved. Using mobility of Mobile robot, weight vector of robots is determined. Using Gradient methode, global motion trajectory is minimized. so the job which Mobile Manipulator perform is optimized. The proposed algorithm is verified with PURL-II which is Mobile Manipulator combined Mobile robot and task robot. and discussed the result.
A Study on the Intrustion Tolerance System Applied To the Security System
Shin Seung-jung ; Kim Jung-tae ; Ryu Dae-hyun ; Na Jong-Whoa ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 38~42
The cyber attacks on the computer system in nowadays are focused on works that do not operate specific application. The main key point that we protect information security system has an access control to keep an application. Most of system has a main function to protect an infrastructure such as hardware, network and operating system. In this paper, we have presented an intrusion tolerance system that can service an application in spite of cyber attacks. The proposed system is based on the middle ware integrating security mechanism and separate function of application and intrusion tolerance. The main factor we use security system in nowadays is service to keep a persistency. The proposed intrusion tolerance system is applicable to such as medical, national defense and banking system.
Design of Adaptive Fuzzy Logic Controller for Speed Control of AC Servo Motor
Nam Jing-Rak ; Kim Min-Chan ; Ahn Ho-Kyun ; Kwak Gun-Pyong ; Chung Chin-Young ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 43~48
In this paper, the adaptive fuzzy logic controller(AFLC) is proposed, which uses real-coding genetic algorithm showing a good performance on convergence velocity and diversity of population among evolutionary computations. The effectiveness of the proposed AFLC was demonstrated by computer simulation for speed control system of AC servo motor. As a result of simulation for the AC servo motor, it is shown the proposed AFLC has the better performance on overshoot, settling time and rising time than the PI controller which is used when tuning AFLC.
An Efficient Visualization Technique of Large-Scale Nodes Structure with Linked Information
Mun Su-Youl ; Ha Seok-Wun ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 49~55
This study is to suggest a visualization technique to display the relations of associated data in an optimal way when trying to display the whole data on a limited space by dealing with a large amount of data with linked information. For example, if you track an IP address through several steps and display the data on a screen, or if you visualize the human gene information on a 3-dimensional space, then it becomes even easier to understand the data flow in such cases. In order to simulate the technique given in this study, the given algorithm was applied to a large number of nodes made in a random fashion to optimize the data and we visually observed the result. According to the result, the technique given in this study is more efficient than any previous method in terms of visualization and utilizing space and allows to more easily understand the whole structure of a node because it consists of sub-groups.
Visual Modeling and Content-based Processing for Video Data Storage and Delivery
Hwang Jae-Jeong ; Cho Sang-Gyu ;
Journal of information and communication convergence engineering, volume 3, issue 1, 2005, Pages 56~61
In this paper, we present a video rate control scheme for storage and delivery in which the time-varying viewing interests are controlled by human gaze. To track the gaze, the pupil's movement is detected using the three-step process : detecting face region, eye region, and pupil point. To control bit rates, the quantization parameter (QP) is changed by considering the static parameters, the video object priority derived from the pupil tracking, the target PSNR, and the weighted distortion value of the coder. As results, we achieved human interfaced visual model and corresponding region-of-interest rate control system.