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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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Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 6, Issue 4 - Dec 2008
Volume 6, Issue 3 - Sep 2008
Volume 6, Issue 2 - Jun 2008
Volume 6, Issue 1 - Mar 2008
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Iterative V-BLAST Decoding Algorithm in the AMC System with a STD Scheme
Lee, Keun-Hong ; Ryoo, Sang-Jin ; Kim, Seo-Gyun ; Hwang, In-Tae ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 1~5
In this paper, we propose and analyze the AMC (Adaptive Modulation and Coding) system with efficient turbo coded V-BLAST (Vertical-Bell-lab Layered Space-Time) technique. The proposed algorithm adopts extrinsic information from a MAP (Maximum A Posteriori) decoder with iterative decoding as a priori probability in two decoding procedures of V-BLAST scheme; the ordering and the slicing. Also, we consider the AMC system using the conventional turbo coded V-BLAST technique that simply combines the V-BLAST scheme with the turbo coding scheme. And we compare the proposed decoding algorithm to a conventional V-BLAST decoding algorithm and a ML (Maximum Likelihood) decoding algorithm. In addition, we apply a STD (Selection Transmit Diversity) scheme to the systems for better performance improvement. Results indicate that the proposed systems achieve better throughput performance than the conventional systems over the entire SNR range. In terms of transmission rate performance, the suggested system is close in proximity to the conventional system using the ML decoding algorithm.
Performance Analysis of Free-Style Writing and Drawing using Ultrasonic Position System
Shin, Low-Kok ; Park, Soo-Hong ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 6~9
In future domestic context aware applications the location of mobile devices is often required. Ultrasonic technology enables high resolution indoor position measurements. A disadvantage of state-of-art ultrasonic systems is that several base stations are required to estimate 3D position. This study aims to evaluate the efficiency and effectiveness of using UPS as a 3D free-hand writing or drawing tool. The processes include the design and testing of UPS as an efficient 3D free-hand writing or drawing tool in the air. The paper will further explain the system architecture of the UPS and how to use GPS as 3D free-hand writing or drawing tool. The efficiency and effectiveness of the system was confirmed by a computer software simulation. The software will further display the result of drawing or writing from the user by graphics. As a result, it is possible to implement UPS as a 3D free-hand writing or drawing tool in the air.
Robot Localization with Ultrasonic Position System
Shin, Low-Kok ; Park, Soo-Hong ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 10~14
The robot localization problem is a key problem in making truly autonomous robots. In this work we provide thorough discussions of Ultrasonic Positioning System can be applied to the localization problem. First, we look at the use of Kalman filters and basic concept and the equation involved in Kalman filters. Secondly, we create understanding of how the Kalman filters can be implemented in robot localization. We show our discussion and experiments how Kalman filters applied to the localization problem. Lastly, we perform simulations using Usat Wheel Chair robot in our own general Kalman filters robot monitoring software.
An Efficient Approach for Lightpath Restoration in WDM Networks
Kabir, S.M. Humayun ; Pham, Van Su ; Yoon, Gi-Wan ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 15~18
WDM is an incredibly promising technique in which multiple channels are operated along a single fiber, providing the facilities of terabit per second bandwidth. Thus, the survivability of WDM networks becomes critical for the success of the next generation internet architecture. Despite the fact that the path-based proactive restoration scheme guarantees 100% restoration as it computes a backup light path while the primary light path is being set up, this method results in additional capacity consumption. In this paper, an ideal technique is proposed that modifies the active multi-backup paths method and results in a better restoration scheme. Based on a theoretical analysis, a new method is shown to reduce the number of hopes as well as the restoration time.
A Study on an Adaptive AQM Using Queue Length Variation
Seol, Jeong-Hwan ; Lee, Ki-Young ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 19~23
The AQM (Active Queue Management) starts dropping packets earlier to notify traffic sources about the incipient stage of congestion. The AQM improves fairness between response flow (like TCP) and non-response flow (like UDP), and it can provide high throughput and link efficiency. In this paper, we suggest the QVARED (Queue Variation Adaptive RED) algorithm to respond to bursty traffic more actively. It is possible to provide more smoothness of average queue length and the maximum packet drop probability compared to RED and ARED (Adaptive RED). Therefore, it is highly adaptable to new congestion condition. Our simulation results show that the drop rate of QVARED is decreased by 80% and 40% compare to those of RED and ARED, respectively. This results in shorter end-to-end delay by decreasing the number of retransmitted packets. Also, the QVARED reduces a bias effect over 18% than that of drop-tail method; therefore packets are transmitted stably in the bursty traffic condition.
Optimal Frame Size Allocation Scheme for RFID Systems
Lim, In-Taek ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 24~28
In RFID System, when multiple tags respond simultaneously, a collision can occur. A method that solves this collision is referred to anti-collision algorithm. Among the existing anti-collision algorithms, static framed slot allocation algorithm is very simple. But when the number of tags is variable, its performance degrades because of the fixed frame size. This paper proposes an optimal frame size allocation scheme that determines the frame size. The proposed scheme is based on the number of collision slots at every frame. According to the simulation results, the tag identification time is faster that of SFSA.
Pipelined Implementation of JPEG Baseline Encoder IP
Kim, Kyung-Hyun ; Sonh, Seung-Il ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 29~33
This paper presents the proposal and hardware design of JPEG baseline encoder. The JPEG encoder system consists of line buffer, 2-D DCT, quantization, entropy encoding, and packer. A fully pipelined scheme for JPEG encoder is adopted to speed-up an image compression. The proposed architecture was described in VHDL and synthesized in Xilinx ISE 7.1i and simulated by modelsim 6.1i. The results showed that the performance of the designed JPEG baseline encoder is higher than that demanded by real-time applications for
image size. The designed JPEG encoder IP can be easily integrated into various application systems, such as scanner, PC camera, color FAX, and network camera, etc.
Realization of FBAR Devices for Broadband WiMAX Applications
Mai, Linh ; Lee, Jae-Young ; Pham, Van Su ; Yoon, Gi-Wan ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 34~37
Effects of the addition of Cr adhesion layer to
multilayer Bragg reflectors on the resonance characteristics of film bulk acoustic wave resonator (FBAR) devices are presented. Main resonance peaks could be significantly shifted to higher frequency, mainly due to the addition of Cr adhesion layer to multilayer Bragg reflectors and control of the bottom electrode thickness as well. The FBAR devices with the Cr adhesion layer in Bragg reflectors could result in much more improved resonance characteristics at about 3 GHz in terms of return loss and Q-factor.
Fabrication and characterization of silicon-based microsensors for detecting offensive
Lee, Kyu-Chung ; Hur, Chang-Wu ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 38~42
Highly sensitive and mechanically stable gas sensors have been fabricated using the microfabrication and micromachining techniques. The sensing materials used to detect the offensive
gases are 1 wt% Pd-doped
and 6 wt%
-doped ZnO, respectively. The optimum operating temperatures of the devices are
, respectively and the corresponding heater power is, respectively, about 55mW and 85mW. Excellent thermal insulation is achieved by the use of a double-layer membrane: i.e.
-thick silicon nitride and
-thick phosphosilicate glass. The sensors are mechanically stable enough to endure the heat cycles between room temperature and
, at least for 30 days.
Design of Connectivity Test Circuit for a Direct Printing Image Drum
Jung, Seung-Min ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 43~46
This paper proposes an advanced test circuit for detecting the connectivity between a drum ring of laser printer and PCB. The detection circuit of charge sharing is proposed, which minimizes the influences of internal parasitic capacitances. The test circuit is composed of precharge circuit, analog comparator, level shifter. Its functional operation is verified using
3.3V/40V CMOS process parameter by HSPICE. Access time is100ns. Layout of the drum contact test circuit is
A Study on Improvement of the Channel Efficiency of FH-SS Transceiver Based on DDS Technique
Kim, Gi-Rae ; Choi, Young-Kyu ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 47~50
A novel high channel efficiency transceiver based on a fast acquisition frequency synthesizer has been designed. The direct digital synthesis (DDS) technique is applied and a simple memory look-up table is incorporated to expedite channel acquisition. The technique simplifies the frequency control process in the transceiver and thus reduces the channel switching time. As a result, the channel efficiency is improved. The designed transceiver is ideal for frequency hopping mobile communication applications.
A Novel Method for Suppression of the Undesired Radiation on the Corrugated DGS
Kim, Gi-Rae ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 51~54
The defected ground structure (DGS) for microstrip structure can be used to protect analog/RF signal from SSN interference of digital circuits on PCB with common ground. However, the basic DGS gives rise to undesired emissions that may interfere with nearby circuitry due to the ground discontinuity. In this paper, we have proposed the modified structure, Corrugated DGS and the method to reduce the radiation by adding the lumped resistor on the proposed Corrugated DGS.
Design of Novel Wiggly Directional Coupler with the Fractal Coupled Sections for Improving Coupling
Hong, Ic-Pyo ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 55~58
In this paper, the new type wiggly directional coupler which uses the fractal coupled shape in coupled sections is presented. A commercial software has been used to analyze this new structure and the simulation results are compared to those of the conventional wiggly directional coupler. To verify the simulation results, the new type wiggly directional coupler was fabricated with the center frequency of 15GHz. The measurement results shows that the coupling of new structure proposed in this paper is more than that of conventional wiggly coupler. The results in this paper also show that the fractal shape coupled lines in wiggling sections can improve the coupling characteristics in wiggly directional coupler.
DEVSIF Composer: A Synthesis Tool for Fast Interpretation of Simulation Models
Lee, Wan-Bok ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 59~63
The methods or algorithms which can accelerate simulation speed became of great importance, as the modeling and simulation methodology for discrete event systems is used in many areas such as model validation/verification and performance evaluation. This paper proposes a tool named, DEVSIF composer. The tool is made of an automated compiled simulation technology and it builds a new composed model which can be executed much fast by composing the component models together. Models are described by our new specification language DEVSIF, which is compatible with object-oriented language and supports representation of a hierarchical model structure. Experimental results demonstrates that DEVSIF composer enhances the simulation speed of a transformed DEVS model 5 times faster than that of the original ones in average.
Implementation of Wireless VoIP System based on VPN
Park, Jung-Yong ; Ryu, Dae-Hyun ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 64~67
VoIP is vulnerable to attack since it uses the Internet to which many people connect simultaneously. In this paper, we designed and implemented a Wireless VoIP + VPN system with which secure telephone calls are possible using the open project SIP VoIP Gateway, 'Asterisk' and 'OpenVPN'.
A Study on VoIP Information Security for Vocie Security based on SIP
Sung, Kyung ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 68~72
The VoIP(Voice over IP) has been worldwide used and already put to practical use in many fields. However, it is needed to ensure secret of VoIP call in a special situation. It is relatively difficult to eaves-drop the commonly used PSTN in that it is connected with 1:1 circuit. However, it is difficult to ensure the secret of call on Internet because many users can connect to the Internet at the same time. Therefore, this paper suggests a new model of Internet telephone for eavesdrop prevention enabling VoIP(using SIP protocol) to use the VPN protocol and establish the probability of practical use comparing it with Internet telephone.
Development of Pocket Insertion style Magnetic Curer that Apply
Variable Magnetic type Probe for Urinary Treatment
Kim, Whi-Young ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 73~79
Result that study magnet nerve curer for treatment induced current generation and current of ion for development in main point incontinence, prostate, sphincter, nervous system, rigidity, headache, retrogression arthritis, ligament damage, Rheumatism arthritis, peripheral nerve etc., can classify by 4. Embodied do first, full bridge magnet occurrence chapter, and communication with PC is available, confirmed various action loops an experiment. Could confirm correct treatment probe second, woman and man disease person. Third, derived so that healing may be possible naturally by addition of apron form according to disease. Because composition of finally, treatment probe composes by act of negative plate form, manufacture is easy and cooling designed for easy direction. More superior result of cooling appeared than existing in incidental and ingredients, cooling efficiency, composition, complexity, convenience etc. that expense and composition manufacture very straightforwardly and experimental by 2 - Tank ways.
A Study on an Image Restoration Algorithm in Universal Noise Environments
Jin, Bo ; Kim, Nam-Ho ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 80~85
Images are often corrupted by noises during signal acquisition and transmission. Among those noises, additive white Gaussian noise (AWGN) and impulse noise are most representative. For different types of noise have different characters, how to remove them separately from degraded image is one of the most fundamental problems. Thus, a modified image restoration algorithm is proposed in this paper, which can not only remove impulse noise of random values, but also remove the AWGN selectively. The noise detection step is by calculating the intensity difference and the spatial distance between pixels in a mask. To divide two different noises, the method is based on three weighted parameters. And the weighted parameters in the filtering mask depend on spatial distances, positions of impulse noise and standard deviation of AWGN. We also use the peak signal-to-noise ratio (PSNR) to evaluate restoration performance, and simulation results demonstrate that the proposed method performs better than conventional median-type filters, in preserving edge details.
Development of Tracking Filter for the Location Awareness of Moving Objects in Ubiquitous Computing
Lee, Yang-Weon ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 86~90
In this paper, I have presented a new approach which can track moving objects in unknown environments. This scheme is important in providing a computationally feasible alternative to complete enumeration of JPDA which is intractable. I have proved that given an artificial measurement and track's configuration, proposed scheme converges to a proper plot in a finite number of iterations. In this light, even if the performance is enhanced by using the relaxation, we also note that the difficulty in tuning the parameters of the relaxation scheme is critical aspect of this suggestion.
Performance Analyses of Fiber-optic Wireless Communication Using Direct Detection
Kim, Jung-Tae ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 91~93
To realize high-speed over GHz bps, it is needed to reduce and suppress the pulse width because of dispersion effect in fiber. We analyzed the performance and waveform due to chirping effect in fiber.
Nucleus Recognition of Uterine Cervical Pap-Smears using FCM Clustering Algorithm
Kim, Kwang-Baek ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 94~99
Segmentation for the region of nucleus in the image of uterine cervical cytodiagnosis is known as the most difficult and important part in the automatic cervical cancer recognition system. In this paper, the region of nucleus is extracted from an image of uterine cervical cytodiagnosis using the HSI model. The characteristics of the nucleus are extracted from the analysis of morphemetric features, densitometric features, colormetric features, and textural features based on the detected region of nucleus area. The classification criterion of a nucleus is defined according to the standard categories of the Bethesda system. The fuzzy C-means clustering algorithm is employed to the extracted nucleus and the results show that the proposed method is efficient in nucleus recognition and uterine cervical Pap-Smears extraction.
Recognition of Container Identifiers Using 8-directional Contour Tracking Method and Refined RBF Network
Kim, Kwang-Baek ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 100~104
Generally, it is difficult to find constant patterns on identifiers in a container image, since the identifiers are not normalized in color, size, and position, etc. and their shapes are damaged by external environmental factors. This paper distinguishes identifier areas from background noises and removes noises by using an ART2-based quantization method and general morphological information on the identifiers such as color, size, ratio of height to width, and a distance from other identifiers. Individual identifier is extracted by applying the 8-directional contour tracking method to each identifier area. This paper proposes a refined ART2-based RBF network and applies it to the recognition of identifiers. Through experiments with 300 container images, the proposed algorithm showed more improved accuracy of recognizing container identifiers than the others proposed previously, in spite of using shorter training time.
A Study on Linear Matrix Inequalities Robust Active Suspension Control System Design Algorithm
Park, Jung-Hyen ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 105~109
A robust optimal control system design algorithm in active suspension equipment adopting linear matrix inequalities control system design theory is presented. The validity of the linear matrix inequalities robust control system design in active suspension system through the numerical examples is also investigated.
The Modeling Scheme of RFID Tags for Processing Regional Queries
Kim, Dong-Hyun ; Hong, Bong-Hee ;
Journal of information and communication convergence engineering, volume 6, issue 1, 2008, Pages 110~116
A RFID is an automatic data collection system based on the radio frequency and is the key technology of ubiquitous computing environments. Since the locations of objects attached by RFID tags can be acquired by readers, it is possible to query the locations of tags. To query tags efficiently, the data of RFID tags should be modeled and indexed. However, since the location information of tags, the predicates of queries, are differ from coordinates of moving objects, it is difficult to model tags under the concept of moving objects, In this paper, we propose the location model of tags to represents the trajectories of tags. The location model is composed of the set and graph based approaches.