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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of The Institute of Internet, Broadcasting and Communication
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Journal DOI :
The institute Of Webcasting, Internet And Telecommunication
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Volume & Issues
Volume 8, Issue 6 - Dec 2008
Volume 8, Issue 5 - Oct 2008
Volume 8, Issue 4 - Aug 2008
Volume 8, Issue 3 - Jun 2008
Volume 8, Issue 2 - Apr 2008
Volume 8, Issue 1 - Feb 2008
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Digital Watermarking using Bit Concealment in Wavelet Transform Domain
Sung, Kwang-Jin ; Kim, Min-Tae ; Lee, Jong-Hyuck ; Jee, Inn-Ho ; Ahn, Hong-Young ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 1~8
The object of watermarking is to prevent from copying and distributing without the copyright or right of ownership. In case of using watermark as an image data we can detect watermark whether an original image exists or not. In this paper, we proposed that an image data is used for watermark and the watermark is detected without an original image. After the original image is transformed with DWT and the watermark is transformed with DCT, they are transformed with binary number. We calculate an optimal bit position for concealing watermark of an original binary image and insert the watermark and determine the best position for robustness against JPEG compression, filtering, and resampling attacks within inserted watermark image. In this paper, we are able to confirm the right of copyright and ownership easily while using invisible watermark and also we can detect a watermark without an original image.
Design and Evaluation of Fuzzy-Logic based Quorum System considering the Gravity of Locality of Mobile in MANETs
Oh, Sun-Jin ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 9~14
Mobile Ad-Hoc network is the network of mobile nodes which has no fixed infrastructure, and mobile node in MANET can move freely and communicate with each other. The location management is an important issue because location information of a mobile node is frequently changed in MANET. In this paper, we propose new quorum system applying the gravity of locality of mobile nodes adaptively by using the fuzzy-logic for the mobility of mobile nodes in order to manage location information of mobile nodes in MANET efficiently. The performance of the proposed scheme is evaluated by an analytical model and compared with those of existing UQS and DQS schemes.
A Study on Sequential Digital Logic Systems and Computer Architecture based on Extension Logic
Park, Chun-Myoung ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 15~21
This paper discuss the sequential digital logic systems and arithmetic operation algorithms which is the important material in computer architecture using analysis and synthesis which is based on extension logic for binary logic over galois fields. In sequential digital logic systems, we construct the moore model without feedback sequential logic systems after we obtain the next state function and output function using building block T-gate. Also, we obtain each algorithms of the addition, subtraction, multiplication, division based on the finite fields mathematical properties. Especially, in case of P=2 over GF(
), the proposed algorithm have a advantage which will be able to apply traditional binary logic directly.The proposed method can construct more efficiency digital logic systems because it can be extended traditional binary logic to extension logic.
A Location-Aided Cooperative Transmission Method in Mobile Ad-hoc Wireless Sensor Networks
Son, Dong-Hwan ; Lee, Joo-Sang ; An, Beong-Ku ; Kong, Hyung-Yun ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 23~28
In this paper, we propose location-aided cooperative routing protocol (LACARP) for supporting power saving and stable route lifetime in mobile ad-hoc wireless sensor networks. The main ideas and features of the proposed routing protocol are as follows. First, the definition of the area of route search using location-based information to support power saving transmission. Second, the expect zone-based establishment of routing route within the area of route search. Third, the cooperative-aided transmission method. In the operation of data transmission over the established rout the datas are transmitted via both the established route and cooperative route aided by neighbor nodes. The performance evaluation using OPNET(Optimized Network Engineering Tool) shows the LACARP can improve the packet delivery ratio and power saving transmission efficiently.
An Energy-Efficient Protocol For Detecting Injurious Insect in Wireless Bio Sensor Networks
Yoo, Dae-Hyun ; Lee, Joo-Sang ; An, Beong-Ku ; Kim, Nam-Soo ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 29~34
In this paper, we proposed a system protocol for detecting injurious insect to support energy saving transmission in wireless bio sensor networks. The main ideas and features of the system are as follows. First, the route establishment method which is based on the energy efficiency and stability by using time-division tree structure. Second, multi-hop direction-based data gatering structure. In this structure, the selected fading method is used to transmit packet via the established tree structure for supporting power saving and route lifetime efficiently. Finally, we can get the node power saving and reduce transmission delay, thus network lifetime and efficiency are improved. The performance evaluation of the proposed protocol is via OPNET(Optimized Network Engineering Tool).
Scientific Technical Development of Traffic Accident Investigation
Hong, You-Sik ; Lee, Chae-Woo ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 35~42
In order to reduce a recent traffic accident, the traffic accident research has been studied using IT technique. But, when running away traffic accident it occurs, it is difficult to find the assault vehicle. In this paper, to solve these problems, if traffic accident will happen, The RFID reader will be able to recognize a license plate number automatically. Moreover, when the traffic accident occurs from the Internet base which uses the PDA the driver traffic accident site data and driver human fact it will be able to transmit in the police station or the insurance company. From the simulation result, it confirms that when passage vehicle speed is low speed above 70% it will be able to recognize the license plate number.
An Efficient Power Processing Method for Cognitive Radio
Cho, Ju-Phil ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 43~48
In this paper, we discuss the transmit power of user in Cognitive Radio environment. Transmit power of user should be operated in order not to give a bad effect to PU(Primary user) and this power can be considered as SINR(Signal to Interference and Noise Ratio) measured in PU. Exact spectrum sensing is required to see which is the vacant frequency. And this spectrum sensing should be operated repeatedly within certain time because the vacant frequency is time-varying. In this paper, we reduce the existing defect by using orthogonal parameter and show the sensing operation is possible if SINR of PU can be guaranteed.
A Study on the Characteristics of Fast Distributed Power Control Schemes in Cellular Network under Dynamic Channel
Lee, Young-Dae ; Park, Hyun-Sook ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 49~55
To address the convergence issue of power control algorithms, a number of algorithms have been developed hat shape the dynamics of up-link power control for cellular network. Power algorithms based on fixed point iterations can be accelerated by the use of various methods, one of the simplest being the use of Newton iterations, however, this method has the disadvantage which not only needs derivatives of the cost function but also may be weak to noisy environment. we showed performance of the power control schemes to solve the fixed point problem under static or stationary channel. They proved goof performance to solve the fixed point problem due to their predictor based optimal control and quadratic convergence rate. Here, we apply the proposed power control schemes to the problem of the dynamic channel or to dynamic time varying link gains. The rigorous simulation results demonstrated the validity of our approach.
Design and Implementation of Real-Time Vehicle Safety System based on Wireless Sensor Networks
Hong, You-Sik ; Oh, Sei-JIn ; Kim, Cheon-Shik ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 57~65
Wireless sensor networks achieve environment monitoring and controlling through use of small devices of low cost and low power. Such network is comprised of several sensor nodes, each having a microprocessor, sensor, actuator and wired/wireless transceiver inside a small device. In this paper, we employ the sensor networks in order to design and implement a real-time vehicle safety system. Such system can inform the safe velocity in a specific weather condition to drivers in advance through analyzing the weather data collected from sensor networks. As a result, the drivers can prevent effectively accidents by controlling their car speed.
Reconfigurable MMIC VCO Design for Wireless Ubiquitous Communications
Kang, Jeong-Jin ; Kim, Wan-Sik ; Lee, Dong-Joon ; Rothwell, Edward J ;
The Journal of The Institute of Internet, Broadcasting and Communication, volume 8, issue 2, 2008, Pages 67~73
Reconfigurable radio technology is needed to reconstruct frequency and modem functionality, which can be different within various regions. In addition, it makes it possible for a single mobile handset to support various standards of wireless communication, and thus plays a key role inmobile convergence. A MMIC VCO(Monolithic Microwave Integrated Circuit Voltage Controlled Oscillator) has been developed to produce high power and wide bandwidth that adapts the Clapp-Gouriet type oscillator for series feedback. We were fabricated based on the 0.15um pHEMT from TRW. The MMIC VCO was connected to an alumina substrate on the carrier for testing. This MMIC VCO module shows good performance when compared with existing VCOs. Futhermore, it has potential as a reconfigurable MMIC VCO for ubiquitous communications such as LMDS (Local Multipoint Distribution Service), VSAT, Point to Point Radio and SATCOM.