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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Communications and Information Sciences
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The Korean Institute of Communications and Information Sciences
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Volume & Issues
Volume 37C, Issue 12 - Dec 2012
Volume 37B, Issue 12 - Dec 2012
Volume 37A, Issue 12 - Dec 2012
Volume 37C, Issue 11 - Nov 2012
Volume 37B, Issue 11 - Nov 2012
Volume 37A, Issue 11 - Nov 2012
Volume 37C, Issue 10 - Oct 2012
Volume 37B, Issue 10 - Oct 2012
Volume 37A, Issue 10 - Oct 2012
Volume 37C, Issue 9 - Sep 2012
Volume 37B, Issue 9 - Sep 2012
Volume 37A, Issue 9 - Sep 2012
Volume 37, Issue 8C - Aug 2012
Volume 37, Issue 8B - Aug 2012
Volume 37, Issue 8A - Aug 2012
Volume 37, Issue 7C - Jul 2012
Volume 37, Issue 7B - Jul 2012
Volume 37, Issue 7A - Jul 2012
Volume 37, Issue 6C - Jun 2012
Volume 37, Issue 6B - Jun 2012
Volume 37, Issue 6A - Jun 2012
Volume 37, Issue 5C - May 2012
Volume 37, Issue 5B - May 2012
Volume 37, Issue 5A - May 2012
Volume 37, Issue 4C - Apr 2012
Volume 37, Issue 4B - Apr 2012
Volume 37, Issue 4A - Apr 2012
Volume 37, Issue 3C - Mar 2012
Volume 37, Issue 3B - Mar 2012
Volume 37, Issue 3A - Mar 2012
Volume 37, Issue 2C - Feb 2012
Volume 37, Issue 2B - Feb 2012
Volume 37, Issue 2A - Feb 2012
Volume 37, Issue 1C - Jan 2012
Volume 37, Issue 1B - Jan 2012
Volume 37, Issue 1A - Jan 2012
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Efficient Generation of 3-D Video Holograms Using Temporal-Spatial Redundancy of 3-D Moving Images
Kim, Dong-Wook ; Koo, Jung-Sik ; Kim, Seung-Cheol ; Kim, Eun-Soo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 859~869
DOI : 10.7840/kics.2012.37C.10.859
In this paper, a new method to efficiently generate the 3-D(three-dimensional) video holograms for 3-D moving scenes, which is called here the TSR-N-LUT method, is proposed by the combined use of temporal-spatial redundancy(TSR) of 3-D video images and novel look-up table(N-LUT) technique. That is, in the proposed scheme, with the differential pulse code modulation (DPCM) algorithm, temporally redundancy redundant data in the inter-frame of a 3-D video images are removed between the frames, and then inter-line redundant data in the inter-frame of 3-D video images are also removed by using the DPCM method between the lines. Experimental results show that the proposed method could reduced the number of calculated object points and the calculation time of one object point by 23.72% and 19.55%, respectively on the average compared to the conventional method. Good experimental results with 3-D test moving pictures finally confirmed the feasibility of the proposed method to the fast generation of CGH patterns of the 3-D video images.
Analysis of Stereo 3D Content Factors Causing Viewer's Discomfort
Kim, Woo-Youl ; Seo, Young-Ho ; Kim, Dong-Wook ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 870~887
DOI : 10.7840/kics.2012.37C.10.870
This paper qualitatively analyzes the stereo 3D content factors causing viewer's discomfort. For this, we perform a subjective test that each subject strokes a specific key whenever he or she feels discomfort during watching stereo 3D contents. Also we extract the quantitative values of the factors in the 3D contents to obtain the temporal changes of the factors. Those two sets of data are used to analyze the contents to find the content factors which cause viewer's discomfort. The factors to be considered are the amount and the frequency of the disparity change, story of the contents, situation or environments of a scene, movement and position of the image or camera, color and luminance information as well as disparities themselves. Most researches have dealt with each factor causing viewer's discomfort but this paper focuses on the composite factors rather than each of them. That is, this paper deals with the various strong and weak factors and their composites causing viewer's discomfort in addition to the big disparities which have been mostly so far.
Location-Aware Fast Link Switching Scheme for Visible Light Communication Networks
Nguyen, Tuan ; Chowdhury, Mostafa Zaman ; Jang, Yeong Min ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 888~893
DOI : 10.7840/kics.2012.37C.10.888
Quality of Service (QoS) provisioning is an important issue in the design of next generation wireless network. In visible light communication (VLC) networks, link switching is a solution to maintain or improve the quality of communication. In this paper, we propose a novel link switching scheme using the location of mobile nodes (MNs). The current serving transmitter uses location history of the MN to find out which neighbor transmitter the MN is approaching. This neighbor transmitter is chosen to inform the MN as the next serving transmitter. The simulation results show that our proposed scheme gains better performance than non-predictive link switching scheme.
Precision Improvement of Indoor Wireless Positioning by Considering Clock Offsets and Wireless Synchronization
Lim, Erang ; Kang, Jimyung ; Lee, Soonwoo ; Park, Youngjin ; Lee, Woncheol ; Shin, Yoan ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 894~900
DOI : 10.7840/kics.2012.37C.10.894
Indoor wireless positioning system uses ranging information of beacons in order to precisely estimate a tag location. To estimate distance between each beacons and tag, the system calculates arrival time of a tag pulse with clock of each beacon including independent clock offset. This clock offset seriously affects the performance of ranging and positioning. We propose in this paper a clock offset compensation method to solve this problem. To verify the performance of the proposed method, we simulated location estimation with random clock offset between -1,000ppm and 1,000ppm, and the result shows that the proposed scheme effectively solves the clock offset problem.
Location-based Frequency Interference Management Scheme Using Fingerprinting Localization Algorithms
Hong, Aeran ; Kim, Kwangyul ; Yang, Mochan ; Oh, Sunae ; Jung, Hongkyu ; Shin, Yoan ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 901~908
DOI : 10.7840/kics.2012.37C.10.901
In an intelligent automated manufacturing environment, an administrator may use M2M (Machine-to-Machine) communication to recognize machine movement and the environment, as well as to respond to any potential dangers. However, commonly used wireless protocols for this purpose such WLAN (Wireless Local Area Network), ZigBee, and Bluetooth use the same ISM (Industrial Science Medical) band, and this may cause frequency interference among different devices. Moreover, an administrator is frequently exposed to dangerous conditions as a result of being surrounded by densely distributed moving machines. To address this issue, we propose in this paper to employ a location-based frequency interference management using fingerprinting scheme in industrial environments and its advanced localization schemes based on k-NN (Nearest Neighbor) algorithms. Simulation results indicate that the proposed schemes reduce distance error, frequency interference, and any potential danger may be responded immediately by continuous tracing of the locations.
RFID Location Based Tree Management System (TMS) Using Insertion UHF RFID Tag and GPS
Nam, Seahyeon ; Chung, You Chung ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 909~914
DOI : 10.7840/kics.2012.37C.10.909
The paper introduces the RFID location based Tree Management System (TMS) using UHF RFID tag and GPS. The bolt shape tag has been developed since the wood material has high dielectric constant. Since the characteristics and impedance of tag antenna can be changed by the material next to the tag, the plastic bolt shape tag antenna has to be carefully designed with consideration of the high dielectric constant of the wood material. The RFID TMS system has been utilized with the bolt shape tag antenna and GPS. The TMS system uses and links Google map to locate the location of the trees. Therefore, this system allow us to manage the trees economically and efficiently.
A Mechanism of Adaptive Switching between Wireless Communication Interfaces
You, Eun-Ji ; Park, Kyung-Min ; Lee, Seung-Won ; Choi, Hoon ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 915~924
DOI : 10.7840/kics.2012.37C.10.915
Though a mobile device is equipped with a number of wireless communication interfaces in general such as Zigbee, Bluetooth, Wi-Fi, 3G, it uses only one interface for a specific service. In this paper, we propose a mechanism of adaptive switching between wireless communication interfaces in order to efficiently use various communication interfaces. Depending on the application service and the characteristics of wireless communication interface, mobile devices select an appropriate wireless communication interface and may switch to another interface during the service. As a result, power consumption can be reduced and the utilization of communication interface can be improved by using this mechanism.
Development of Path-Finding System for Humanoid Robots Based on Image Pattern Recognition
Park, Hyun ; Eun, Jin-Hyuk ; Park, Hae-Ryeon ; Suk, Jung Bong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 925~932
DOI : 10.7840/kics.2012.37C.10.925
In this paper, we develop a pattern recognition algorithm applied to a humanoid robot which is exploited as a guide for visually handicapped persons to find a desired path to their destinations. Behavior primitives of a humanoid robot are defined, and Canny's edge detection algorithm is employed to extract the pattern and color of the paving blocks that especially devised for visually handicapped persons. Based on these, an efficient path finding algorithm is developed and implemented on a humanoid robot, running on an embedded linux operating system equipped with a video camera. The performance of our algorithm is experimentally examined in terms of the response time and the pattern recognition ratio. In order to validate our algorithm in various realistic environments, the experiments are repeatedly performed by changing the tilt of paving blocks and the brightness in surrounding area. The results show that our algorithm performs sufficiently well to be exploited as a path finding system for visually handicapped persons.
A Study on the Pattern Matching Algorithm of 3D Coordinates for Quality Control in Ship Blocks
Lee, Ho Cheol ; Lee, Dong Myung ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 933~939
DOI : 10.7840/kics.2012.37C.10.933
In general, the three-dimensional(3D) coordinates of the manufactured ship blocks are measured using the laser measuring equipment by ship engineers. But, many deflections between the measured coordinates in manufactured step and the designed coordinates in the design step are occurred because of the measuring process of ship blocks manually. Thus, the ship engineer should conform the consistency between the measured coordinates and the designed coordinates step by step, and it largely causes the loss of manpower and time. In this paper, the automated pattern matching algorithm of 3D coordinates for quality control in ship blocks is suggested in order to solve this problem, and the performance of the algorithm is analyzed using the 3D coordinates simulation software developed by our research laboratory. The coordinates matching rate of the measured coordinates in the single/multi ship block(s) is about 90.2% under the tolerated distance error range is 20~25cm.
Implementation and Analysis of Multi-Precision Multiplication for Public Key Cryptography Based on Android Platform
Seo, Hwa-Jeong ; Kim, Ho-Won ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 940~948
DOI : 10.7840/kics.2012.37C.10.940
Android program is developed with JAVA SDK and executed over virtual machine. For this reason, programming is easier than traditional C language but performance of operating speed decreases. To enhance the performance, NDK development tool, which provides C language, assembly language environment, was proposed. Furthermore, with NEON function provided by ARM, we can utilize the vector operation and enhance performance. In the paper, we explore effectiveness of NDK and then propose advanced multiplication structure with NEON function.
A Design Secure QR-Login User Authentication Protocol and Assurance Methods for the Safety of Critical Data Using Smart Device
Lee, Jae-Sik ; You, Han-Na ; Cho, Chang-Hyun ; Jun, Moon-Seog ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 949~964
DOI : 10.7840/kics.2012.37C.10.949
Our PC have been under constant threat of malicious codes and viruses today. As many new ways of cyber attacks are being developed, such as zero-day-attack, nobody's PC is guaranteed to be safe from the attacks. In case where a user uses the existing verification protocol on a unsecured PC, the user's verification information may well be threatened by sniffing or man-in-the-middle attack. Especially, deadly attacks like memory hacking would give hard time for users to even recognize any symptom of virus infection. Therefore, this paper designs secured QR-Login user verification protocol for smart devices that are ready to communicate with QR-Code and proposes a way to keep critical data safe when using the internet. This way, user would be able to safeguard his/her critical data even when under attack by unknown attacks and safely carry out extremely sensitive task, like financial trading, on the device.
Aeronautical Link Availability Analysis for the Multi-Platform Image & Intelligence Common Data Link
Ryu, Young-Jae ; Ryu, Jung-Hun ; Pak, Ui-Young ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 965~976
DOI : 10.7840/kics.2012.37C.10.965
Multi-Platform Image and Intelligence Common data link(MPI-CDL) systems are designed to transmit the imaginary and signal intelligence data at an aeronautical to ground line of sight(LOS) link. This paper proposes a method to predict a link availability and analyzes the required link margin to satisfy a given link availability for MPI-CDL systems. To estimate a link availability the proposed method applies the conditional probability so that both a rain attenuation and a multipath fading are considered simultaneously. Link margins to meet the link availability for MPI-CDL systems are calculated according to an operating environment including frequencies, flight altitudes and transmission ranges. The required link margins for actual unmanned air vehicle systems are also given by simulation results.
An Enhanced DAP-NAD Scheme for Multi-Hop Transmission in Combat Net Radio Networks
Jung, Jong-Kwan ; Kim, Jong-Yon ; Roh, Byeong-Hee ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 977~985
DOI : 10.7840/kics.2012.37C.10.977
Recently, many countries have been developing new protocols to improve the performance of tactical ad hoc networks for implementing NCW (Network Centric Warfare). Combat net radio (CNR) networks are the most important communication infra for the ground forces such as infantry of Army. U.S. Army had developed MIL-STD-188-220D that is the Interoperability Standard for DMTDs (Digital Messages Transfer Device Subsystems) for voice and data communication in CNR. MIL-STD-188-220D is a candidate for MAC protocol of TMMR which is next radio and has a few constraints to used in TMMR. NAD (Network Access Delay) defined in MIL-STD-188-220D needs time synchronization to avoid collision. However, it is difficult for time synchronization to fit in multi-hop environment. We suggest the enhanced DAP (Deterministic Adaptable Priority)-NAD to prevent conflicts and decrease delays in multi-hop CNR. Simulation results show that the proposed scheme improves the performance in multi-hop CNR networks.
Smart Device Security Technology for Cyber Defense
Son, Iek-Jae ; Kim, Il-Ho ; Yang, Jong-Hyu ; Lee, Nam-Young ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 986~992
DOI : 10.7840/kics.2012.37C.10.986
As the utilization of smart mobile devices such as smartphones increases, the desire to utilize such devices to control and monitor combat situations also arises. As smart mobile devices with various ICT get integrated with various weaponry system, a new phase of future warfare can be introduced. Moreover, smartphone-based real-time information technology for joint battle command system will be converged with surveillance control to become a leading example of convergence of cyber defense and information technology. Furthermore, mobile device security technology ideal for mobile wireless network environments can be applied to military robots. The following paper will give an overview of smart mobile device usage used for military purposes in battle command system, various security threats and the mobile device security technology to correspond to such security threats.
Joint Analysis of Combat Power and Communication System via Interoperation of War Game Simulator with Communication Network Simulator
Kim, Tag Gon ; Kim, Deok Su ; Sung, Changho ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 993~1003
DOI : 10.7840/kics.2012.37C.10.993
This paper presents a method for joint analysis of combat power and communication system performance via interoperation of a war game simulator and a communication network simulator using HLA/RTI. Effectiveness analysis of combat power has been performed by war game simulation with consideration of communication effects simulated by the network simulator. Performance analysis of a communication system has been performed by network simulation with computer forces generated by the war game simulator. Survivability of the red force and transmission power of a tactical FM radio for the blue force have been measured for the joint analysis.
Clock Synchronization for Multi-Static Radar Under Non-Line-of-Sight System Using Robust Least M-Estimation
Shin, Hyuk-Soo ; Yeo, Kwang-Goo ; Joeng, Myung-Deuk ; Yang, Hoongee ; Jung, Yongsik ; Chung, Wonzoo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 37C, issue 10, 2012, Pages 1004~1010
DOI : 10.7840/kics.2012.37C.10.1004
In this paper, we propose the algorithm which considers applying recently proposed clock synchronization techniques with quite high accuracy in a few wireless sensor networks researches to time synchronization algorithm for multi-static radar system and especially overcomes the limitation of previous theory, cannot be applied between nodes in non-line of sight (NLOS). Proposed scheme estimates clock skew and clock offset using recursive robust least M-estimator with information of time stamp observations. And we improve the performance of algorithm by tracking and suppressing the time delays difference caused by NLOS system. Futhermore, this paper derive the mean square error (MSE) to present the performance of the proposed estimator and comparative analysis with previous methods.