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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Information and Communication Engineering
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Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 11, Issue 12 - Dec 2007
Volume 11, Issue 11 - Nov 2007
Volume 11, Issue 10 - Oct 2007
Volume 11, Issue 9 - Sep 2007
Volume 11, Issue 8 - Aug 2007
Volume 11, Issue 7 - Jul 2007
Volume 11, Issue 6 - Jun 2007
Volume 11, Issue 5 - May 2007
Volume 11, Issue 4 - Apr 2007
Volume 11, Issue 3 - Mar 2007
Volume 11, Issue 2 - Feb 2007
Volume 11, Issue 1 - Jan 2007
Selecting the target year
Design of Three-stacked Microstrip Patch Array Antenna Having Tx/Rx Feeds For Satellite Communication
Park, Ung-Hee ; Noh, Haeng-Sook ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 853~859
This paper presents a microstrip patch array antenna having transmission feed and reception feed for satellite communication in the Ku band. In this paper, the element of the patch array antenna is a three-stacked structure consisting of one radiation patch and two parasitic patches for high gain and wide bandwidth characteristics. To obtain higher gain, the unit elements are expanded into a
may using a mixture of series and parallel feeds. The proposed antenna has horizontal polarization for the Rx band and vertical polarization for the Tx band. To verify the practicality of this antenna, we fabricated a three-stacked patch array antenna and measured its performance. The gain of the array antenna in the Rx and Tx bands exceeds 17 and 18 dBi, respectively. The impedance bandwidth is over 10 % in both bands. The cross-polarization level is below -25 dB, and the sidelobe level is below -9.4 dB.
A Design and Implementation of Interoperable DRM System Based on DMP
Cho, Tae-Beom ; Lee, Sang-Jo ; Jung, Hoe-Kyung ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 860~867
Digital Contents are increasing the modification of the contents by individual user and the modified or copied contents are simply distributed though the ultrahigh speed internet and the negative pervasive effect on the contents market is increasing. The solutions for copyright protection from illegally distributing contents are developing by various standardization groups and contents manufacturers and its commercia use is partly practiced. The MPEG was developing the IPMP technique to apply existed MPEG standards as a way of digital contents protection. However, as these IPMP techniques did not provide a satisfactory function for contents protection, the DMP standard was suggested as an alternative plan. In this paper, the system is designed and materialized to apply the TooIPack concept of DMP which ensure the interoperability of DRM system. With this paper, it is expected that the practical use and the possibility of the DMP standard in the DRM market would be verified and DMP standard may presents as a reference model for more systematic standardization operations.
Video Quality Variation Minimizing for Real-Time Low Bit Rate Video
Park, Sang-Hyun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 868~874
A real-time frame-layer rate control algorithm with a token bucket traffic shaper is proposed for minimizing video duality variation. The proposed rate control method uses a non-iterative optimization method for low computational complexity, and performs bit allocation at the frame level to minimize variation in distortion between frames. In order to reduce the quality fluctuation, we use a sliding window scheme which does not require the pre-analysis process. Therefore, the proposed algorithm does not produce the delay from encoding, and is suitable for real-time low-complexity video encoder. Experimental results indicate that the proposed control method provides better PSNR performance than the existing rate control method.
Effective PPL Arrangements in the Screen of Multimedia Contents
Lee, Young-Jae ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 875~881
This study explores the attention effects of PPL(product placement) in multimedia contents. PPL has been attracted attention in multimedia as well as marketing communication field as a beneficiary model. For the research, multimedia screen is divided into 9 sections and the serial 9 digit(
) is assigned to the each part of the screen. The visual exposure forms of each 9 digit are composed by 2-dimension(2D) and 3-dimension(3D). And the visual exposure patterns of each 9 digit are consisted of stopping and moving image. As a result, the 5th quartering has been proved the most attracted attention regardless of all exposure forms including 2D/3D and slopping/moving image. This means center of the multimedia screen is the best place for PPL. Especially in one digit moving screen the attention of the digit has reached the climax. This suggests moving PPL is able to get more attention than stopping. These results provide the most effective PPL position in the screen of the multimedia and PPL's visual exposure forms for maximizing multimedia user's attention. Finally, these findings can be a guideline fer message arrangements of the multimedia screen.
Finding the Ball with WaterShed Algorism
Yu, Ji-Chul ; Kim, Young-Kil ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 882~888
This is the paper for finding the hidden ball with the Water Shed Algorism, and for analyzing the weakness. So, With this paper, Other institutions or organizations can improve their research skill. For this research, Visual Studio C++ is used, and some kinds of Algorism is added to the software such as Distance Transform, Labelling which we make.
A study on a sequenced directed diffusion algorithm for sensor networks
Jang, Jae-Shin ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 889~896
Advances in wireless networking, micro-fabrication and integration, and embedded microprocessors have enabled a new generation of massive-scale sensor networks. Because each sensor node is limited in size and capacity, it is very important to design a new simple and energy efficient protocol. Among conventional sensor networks' routing protocols, the directed diffusion scheme is widely blown because of its simplicity. This scheme, however, has a defect in that sending interest and exploratory data messages while setting connection paths consumes much energy because of its flooding scheme. Therefore, this paper proposes a new sensor network routing protocol, called sequenced directed diffusion with a threshold control, which compromises the conventional directed diffusion scheme's defect and offers an energy efficient routing idea. With a computer simulation, its performance is evaluated and compared to the conventional directed diffusion scheme. Numerical results show that the proposed scheme offers energy efficiency while routing packets, and resolves ill-balanced energy consumption among sensor nodes.
The Implementation of Real Time Communication Simulation using TMO in Distributed Network systems
Kim, Gwang-Jun ; Seo, Jong-Joo ; Kang, Ki-Woong ; Yoon, Chan-Ho ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 897~905
In this paper, we present a new framework and synchronization mechanism to effectively support developing real-time communication service by using a real-time object model named TMO (Time-Triggered Message-Triggered Object). Also, we describes the application environment as the DHS(distributed high-precision simulation) to guarantee real-time service message with TMO structure in distributed network systems. The TMO scheme is aimed for enabling a great reduction of the designer's effort in guaranteeing timely real-time communication service capabilities of among distributed multi-nodes systems. Our real-time framework provide the consistent construction and configuration of tine-triggered processing components across heterogeneous distributed object environment more easily. It has been formulated from the beginning with the objective of enabling design-time guaranteeing of timely action. In the real time simulation techniques based on TMO object modeling, we have observed several advantages to the TMO structuring scheme. TMO object modeling has a strong traceability between requirement specification and design.
The FPGA implementation of the RC-DBA algorithm in the EPON
Jang, Jong-Wook ; Kang, Hyun-Jin ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 906~914
In the upstream link of EPON, numerous ONUs In the reverse link of the EPON network, numerous ONUs receive the privileges to use the optical medium from the scheduler of the LOT, but not through the competition with others. Therefore, it is very important to select a proper DBA algorithm to allocatethe frequency band to each ONU in an effectively and fair manner. In our preceding study, we proposed the RC-DBA algorithm that complements many problems in existing DBA algorithms. In this paper, we designed the MAC scheduler for the OLT, which the proposed algorithmwas applied to and implement it in the FPGA. In addition, in order to verify the operation of the scheduler, we developed the embedded Linux based testbed.
Tonal Extraction Method for Underwater Acoustic Signal Using a Double-Feedback Neural Network
Lim, Tae-Gyun ; Lee, Sang-Hak ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 915~920
Using the existing algorithms that estimate the background noise, the detection probability for the week tonals is low and for the even week tonals, there is a limit not detected. Therefore it is required to algorithms which can improve the performance of the tonal extraction. Recently, many researches using artificial neural networks in sonar signal processing are performed. We propose a neural network with double feedback that can remove automatically the background noise and detect the even week tonals buried in background noise, therefore not detected by growing the week tonals lastingly for a certain time. For the real underwater target, experiments for the tonal extraction are performed by using the existing algorithms that estimate the background noise and the proposed neural network. As a result of the experiment, a method using the proposed neural network showed the better performance of the tonal extraction in comparison with the existing algorithms.
Analysis of Information Related to Object Fragmentation Using Radiated Sounds Due to Underwater Shock Wave
Jang, Yoon-Seok ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 921~925
This paper investigates the information related to the radiated sounds during treatment using the extracorporeal shock wave lothotriptor(ESWL). First, we observe the vibration of the objects from the radiated sounds and extract the information about the change of the peak frequency from the relation between the vibration and the radiated sounds. Next, we observe the change of the peak frequency according to the position of the focus and demonstrate that it is more difficult to vibrate objects exactly at the focal point than above or below the focus of the ESWL device. Lastly, we analyze the relation between the cavitation and the radiated sounds and examine the benefiting condition for the object fragmentation.
Design of High-speed VPN System for Network Processor with Embedded Crypto-module
Kim, Jung-Tae ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 926~932
Various research groups proposed various architecture of hardware VPN for the high performance VPN system. However, the VPN based on hardware researcher are focused only on the encryption acceleration. Soft based VPN is only useful when the network connection is slow. We have to consider the hardware performance (encryption/decryption processing capability, packet processing, architecture method) to implement hardware based VPN. In this paper, we have analysed architecture of hardware, consideration and problems for high-speed VPN system, From the result, we can choose the proper design guideline
Active Security System using IP Traceback Technology
Kim, Jae-Dong ; Chae, Cheol-Joo ; Lee, Jae-Kwang ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 933~939
There is a tremendous increase in the growth of Internet making people's life easy. The rapid growth in technology has caused misuse of the Internet like cyber Crime. There are several vulnerabilities in current firewall and Intrusion Detection Systems (IDS) of the Network Computing resources. Automatic real time station chase techniques can track the internet invader and reduce the probability of hacking Due to the recent trends the station chase technique has become inevitable. In this paper, we design and implement Active Security system using ICMP Traceback message. In this design no need to modify the router structure and we can deploy this technique in larger network. Our Implementation shows that ICMP Traceback system is safe to deploy and protect data in Internet from hackers and others.
Discovery of Frequent Traversal Patterns from Weighted Traversals and Performance Enhancement by Traversal Split
Lee, Seong-Dae ; Park, Hyu-Chan ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 940~948
Many real world problems can be modeled as a graph and traversals on the graph. The structure of Web pages can be represented as a graph, for example, and user's navigation paths on the Web pages can be model as a traversal on the graph. It is interesting to discover valuable patterns, such as frequent patterns, from such traversals. In this paper, we propose an algorithm to discover frequent traversal patterns when a directed graph and weighted traversals on the graph are given. Furthermore, we propose a performance enhancement by traversal split and then verify it through experiments.
Temperature Stable Frequency-to-Voltage Converter
Choi, Jin-Ho ; Yu, Young-Jung ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 949~954
In this work, temperature stable frequency-to-voltage converter is proposed. In FVC circuit input frequency is converted into output voltage signal. A FLL is similar to PLL in the way that it generates an output signal which tracks an input reference signal. A PLL is built on a phase detector, a charge pump, and a low pass filter. However, FLL does not require the use of the phase detector, the charge pump and low pass filter. The FVC is designed by using
CMOS process technology. From simulation results, the variation of output voltage is less than
in the temperature range
when the input frequency is from 70MHz to 140MHz.
Gate Voltage Dependent Tunneling Current for Nano Structure Double Gate MOSFET
Jung, Hak-Kee ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 955~960
In this paper, the deviation of tunneling current for gate voltage has been investigated in double gate MOSFET developed to decrease the short channel effects. In device scaled to nano units, the tunneling current is very important current factor and rapidly increases,compared with thermionic emission current according to device size scaled down. We consider the change of tunneling current according to gate voltage in this study. The potential distribution is derived to observe the change of tunneling current according to gate voltage, and the deviation of off-current is derived from the relation of potential distribution and tunneling probability. The derived current is compared with the termionic emission current, and the relation of effective gate voltage to decrease tunneling current is obtained.
A study on adaptive noise cancellation for enhancement of digital speech articulation
Kim, Soo-Yong ; Jee, Suk-Kun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 961~968
Today, we can use radio communication device anywhere-anytime. Sometimes, we use the device in acoustic noise environment. The acoustic noise makes many problems in communication system. In acoustic noise environment, speaker cannot send clear information to receiver, because the received signal includes both speech signal and noise signal. A digital filter is useful to remove noise to get desired signal. One of methods is the adaptive digital filter using the adaptive noise canceller that automatically adjust filter parameters. This thesis addresses articulation algorithms against actual acoustic noises by means of two adaptive filtering methods. One is the adaptive noise canceller with two input channels and another is the spectral subtraction filter with one input channel. The experimental result from the proposed filter shows that the adaptive noise canceller is useful to reduce the non-stationary noises, while the spectral amplitude filter is effective for stationary noises.
Image Recognition by Fuzzy Logic and Genetic Algorithms
Ryoo, Sang-Jin ; Na, Chul-Hoon ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 969~976
A fuzzy classifier which needs various analyses of features using genetic algorithms is proposed. The fuzzy classifier has a simple structure, which contains a classification part based on fuzzy logic theory and a rule generation part using genetic algorithms. The rule generation part determines optimal fuzzy membership functions and inclusion or exclusion of each feature in fuzzy classification rules. We analyzed recognition rate of a specific object, then added finer features repetitively, if necessary, to the object which has large misclassification rate. And we introduce repetitive analyses method for the minimum size of string and population, and for the improvement of recognition rates. This classifier is applied to two examples of the recognition of iris data and the recognition of Thyroid Gland cancer cells. The fuzzy classifier proposed in this paper has recognition rates of 98.67% for iris data and 98.25% for Thyroid Gland cancer cells.
Realtime Face Tracking using Motion Analysis and Color Information
Lee, Kyu-Won ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 977~984
A realtime face tracking algorithm using motion analysis from image sequences and color information is proposed. Motion area from the realtime moving images is detected by calculating temporal derivatives first, candidate pixels which represent face region is extracted by the fusion filtering with multiple color models, and realtime face tracking is performed by discriminating face components which includes eyes and lips. We improve the stability of face tracking performance by using template matching with face region in an image sequence and the reference template of face components.
Study on Optical Feedback in Optical Fiber Laser
Choi, Kyoo-Nam ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 985~990
The method of enhancing visibility in optical fiber sensor was investigated by improving coherence length of light source. The optical feedback technique is used to enhance coherence length in fiber laser which generates laser in near infrared wavelength region and utilizes low loss characteristics of optical communication grade fiber. In this paper, the effect to coherence length by short and long optical feedback paths are investigated by using Mach-Zehnder interferometer technique. The effect to coherence length by changing optical feedback power and optical modulation are investigated. The spectral drift was calculated by measuring the degree of phase perturbation in unbalanced Mach-Zehnder interferometer having loom path difference. The short optical feedback path was effective to reduce spectral drift to 450kHz/sec and the long optical feedback path in combination with short optical feedback path was found to further reduce spectral drift to 50kHz/sec.
Plane-based Computational Integral Imaging Reconstruction Method of Three-Dimensional Images based on Round-type Mapping Model
Shin, Dong-Hak ; Kim, Nam-Woo ; Lee, Joon-Jae ; Kim, Eun-Soo ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 991~996
Recently, a computational reconstruction method using an integral imaging technique, which is a promise three-dimensional display technique, has been actively researched. This method is that 3-D images can be digitally reconstructed at the required output planes by superposition of all of the inversely enlarged elemental images by using a hypothetical pinhole array model. However, the conventional method mostly yields reconstructed images having a low-resolution, because there are some intensity irregularities with a grid structure at the reconstructed mage plane by using square-type elemental images. In this paper, to overcome this problem, we propose a novel computational integral imaging reconstruction (CIIR) method using round-type mapping model. Proposed CIIR method can overcome problems of non-uniformly reconstructed images caused from the conventional method and improve the resolution of 3-D images. To show the usefulness of the proposed method, both computational experiment and optical experiment are carried out and their results are presented.
Defect Inspection of the Polarizer Film Using Singular Vector Decomposition
Jang, Kyung-Shik ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 997~1003
In this paper, we propose a global approach for automatic inspection of defects in the polarizer film image. The proposed method does not rely on local feature of the defect. It is based on a global image reconstruction scheme using the singular value decomposition(SVD). SVD is used to decompose the image and then obtain a diagonal matrix of the singular values. Among the singular values, the first singular value is used to reconstruct a image. In reconstructed image, the normal pixels in background region have a different characteristics from the pixels in defect region. It is obtained the ratio of pixels in the reconstructed image to ones in the original image and then the defects are detected based on the the statistical process of the ratio. The experiment results show that the proposed method is efficient for defect inspection of polarizer lam image.
Recognition of a New Car License Plate Using HSI Information, Fuzzy Binarization and ART2 Algorithm
Kim, Kwang-Baek ; Woo, Young-Woon ; Park, Choong-Shik ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 1004~1012
In this paper, we proposed a new car license plate recognition method using an unsupervised ART2 algorithm with HSI color model. The proposed method consists of two main modules; extracting plate area from a vehicle image and recognizing the characters in the plate after that. To extract plate area, hue(H) component of HSI color model is used, and the sub-area containing characters is acquired using modified fuzzy binarization method. Each character is further divided by a 4-directional edge tracking algorithm. To recognize the separated characters, noise-robust ART2 algorithm is employed. When the proposed algorithm is applied to recognize license plate characters, the extraction rate is better than that of existing RGB model and the overall recognition rate is about 97.4%.
Fuel Injection Control of Vehicles Using Fuzzy Control Technique
Kim, Kwang-Baek ; Woo, Young-Woon ; Ha, Sang-An ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 1013~1018
In general, there are many sensors for fuel injection control such as an air flow sensor, an air intake temperature sensor, a cooling water temperature sensor, a throttle position sensor, and a motor position sensor. In this paper, we proposed a method for controlling the amount of fuel consumption in cars using fuzzy control technique by temperature change of an air intake temperature sensor and air-fuel ratio, the ratio of air and fuel mixture. In the proposed method, the amount of fuel injection is controlled by fuzzy membership functions and fuzzy inference rules established for air-fuel ratio, air intake temperature, and final fuel compensation, after computing air-fuel values using each amount of air intake and each amount of fuel injection. We verified that the proposed method is more efficient than conventional methods in fuel injection control from the results of the simulation program.
Design of a Fuzzy Logic Controller Using an Adaptive Evolutionary Algorithm for DC Series Motors
Kim, Dong-Wan ; Hwang, Gi-Hyun ; Lee, Jae-Hyun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 1019~1028
In this paper, adaptive evolutionary algorithm(AEA) is proposed, which uses both genetic algorithm(GA) with good global search capability and evolution strategy(ES) with good local search capability in an adaptive manner, when population evolves to the next generation. In the reproduction procedure, proportion of the population for GA and ES is adaptively determined according to their fitness. The AEA is used to design membership functions and scaling factors of the fuzzy logic controller(FLC). To evaluate the performance of the proposed FLC design method, we make an experiment on the FLC for the speed control of an actual DC series motor system with nonlinear characteristics. Experimental results show that the proposed controller has better performance than PD controller.
Hierarchical Verification Methodology of Discrete Event Systems
Song, Hae-Sang ; Lee, Wan-Bok ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 1029~1036
State explosion is a well-known problem that impedes analysis md testing of discrete event systems, thus making the verification of large systems intrinsically difficult job. This paper suggests a hierarchical verification methodology of untimed DEVS model which can alleviate the state explosion problem. The method is a repetitive procedure of designing and verifying between the upper level and the lower level models abstracting away the unnecessary information with respect to a given verification task. A small example was employed to show our suggested method in detail.
Design and Implementation of An Authentication System for Residential Permit Parking Using Wireless Sensor Networks
Park, Jun-Sik ; Kwon, Chun-Ja ; Kim, Hyun-Chun ; Kim, Brian ;
Journal of the Korea Institute of Information and Communication Engineering, volume 11, issue 5, 2007, Pages 1037~1045
An efficient management system for parking lots and traffic monitoring in a metropolitan city is a very important issue, which is tightly closed to qualify of life. While a residential permit parking program has been contributing to resolve the lack of parking places, there has been no autonomous authentication system due to no apparent entrance gate and smallness of each parking zone. In this paper, we propose and implement an authentication system for residential permit parking lot using wireless sensor networks, which is cost-effective and even no need for additional managing person. Through the experimental evaluation, we analyzed relationship between the life time of sensor nodes and the various values of sleep periods to minimize power consumption of the nodes, and also showed that the difference of luminance sensed by each sensor node is at least 45 or bigger between when the parking place is occupied or not, resultingly it can be used to decide whether a parking place is occupied or not by simply detecting the change of luminance sensed.