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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
Efficient Thermal Annealing for FBAR Devices
Song Hae-il ; Mai Linh ; Yoon Giwan ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 167~171
In this paper, the resonance characteristics of SMR-type FBAR devices annealed by three different annealing methods are investigated and compared. The resonance characteristics could be effectively improved by the proposed efficient annealing method which optimizes the annealing conditions. It seems very useful for improving the performance of the SMR-type FBAR devices as a cost-effective way.
Optimization of Channel Capacity in MIMO Systems
Pham Van-Su ; Le Minh Tuan ; Yoon Giwan ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 172~175
In this paper, a new method to get the optimum channel capacity of a Multiple-Input MultipleOutput (MIMO) system is presented. The proposed method exploits the diagonal structure of channel matrix to maximize the channel capacity. The diagonal format of the channel matrix is formed by multiplying the transmitted signal with the pre-compensated channel PCC) matrix. Numerical simulations show that the proposed method exploiting the diagonal structure of channel matrix could significantly increase the system capacity compared with the system without applying the diagonal structure of channel matrix.
Closed-form for Bit Error Rate of MSK and OQPSK Systems with a Smart Antenna
Le Minh-Tuan ; Pham Van-Su ; Yoon Giwan ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 176~178
This paper presents closed-form expressions for exact bit error rate of MSK and OQPSK systems employing an adaptive antenna array at base station to eliminate co-channel interference. The channels under consideration are AWGN and one-path flat Rayleigh fading with AWGN. Computer simulation is carried out to confirm the theoretical results.
a-Si:H Photodiode Using Alumina Thin Film Barrier
Hur Chang-Wu ; Dimitrijev Sima ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 179~183
A photodiode capable of obtaining a sufficient photo/ dark current ratio at both forward bias state and reverse bias state is proposed. The photodiode includes a glass substrate, an aluminum film formed as a lower electrode over the glass substrate, an alumina film formed as an insulator barrier over the aluminum film, a hydrogenated amorphous silicon film formed as a photo conduction layer over a portion of the alumina film, and a transparent conduction film formed as an upper electrode over the hydro-generated amorphous silicon film. A good quality alumina
film is formed by oxidation of aluminum film using electrolyte solution of succinic acid. Alumina is used as a potential barrier between amorphous silicon and aluminum. It controls dark-current restriction. In case of photodiodes made by changing the formation condition of alumina, we can obtain a stable dark current
in alumina thickness below
. At the reverse bias state of the negative voltage in ITO (Indium Tin Oxide), the photo current has substantially constant value of
A at light scan of 100 1x. On the other hand, the photo/dark current ratios become higher at smaller thicknesses of the alumina film. Therefore, the alumina film is used as a thin insulator barrier, which is distinct from the conventional concept of forming the insulator barrier layer near the transparent conduction film. Also, the structure with the insulator thin barrier layer formed near the lower electrode, opposed to the ITO film, solves the interface problem of the ITO film because it provides an improved photo current/dark current ratio.
A Study of Phase Noise Due to Power Supply Noise in a CMOS Ring Oscillator
Park Se-Hoon ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 184~186
The effect of power supply noise on the phase noise of a ring oscillator is studied. The power supply noise source in series with DC power supply voltage is applied to a 3 stage CMOS ring oscillator. The phase noise due to the power supply noise is modeled by the narrow band phase modulation. The model is verified by the fact that the spectrum of output of ring oscillator has two side bands at the frequencies offset from the frequency of the ring oscillator by the frequency of the power supply noise source. Simulations at several different frequency of the power supply noise reveals that the ring oscillator acts as a low pass filter to the power supply noise. This study, as a result, shows that the phase noise generated by the power supply noise is inversely proportional to the frequency offset from the carrier frequency.
Sensitivity Analysis of Plasma Charge-up Monitoring Sensor
Lee Sung Joon ; Soh Dea-Wha ; Hong Sang Jeen ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 187~190
High aspect ratio via-hole etching process has emerged as one of the most crucial means to increase component density for ULSI devices. Because of charge accumulation in via-hole, this sophisticated and important process still hold several problems, such as etching stop and loading effects during fabrication of integrated circuits. Indeed, the concern actually depends on accumulated charge. For monitoring accumulated charge during plasma etching process, charge-up monitoring sensor was fabricated and tested under some plasma conditions. This paper presents a neural network-based technique for analyzing and modeling several electrical performance of plasma charge-up monitoring sensor.
Characterization of Negative Photoresist Processing by Statistical Design of Experiment (DOE)
Mun Sei-Young ; Kim Gwang-Beom ; Soh Dea-Wha ; Hong Sang Jeen ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 191~194
SU-8 is a epoxy based photoresist designed for MEMS applications, where a thick, chemically and thermally stable image are desired. However SU-8 has proven to be very sensitive to variation in processing variables and hence difficult to use in the fabrication of useful structures. In this paper, negative SU-8 photoresist processed has been characterized in terms of delamination, based on a full factorial designed experiment. Employing the design of experiment (DOE), a process parameter is established, and analyzing of full factorial design is generated to investigate degree of delamination associated with three process parameters: post exposure bake (PEB) temperature, PEB time, and exposure energy. These results identify acceptable ranges of the three process variables to avoid delamination of SU-8 film, which in turn might lead to potential defects in MEMS device fabrication.
MPEG-4 IPMP Authoring Tool for Protection and Management of Digital Contents
Kim Kwang-Yong ; Kim Jae-Gon ; Hong Jin-Woo ; Kim Chang-Su ; Jung Hoe-Kyung ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 195~200
The MPEG-4 standard is aimed to define an object based audiovisual coding standard to address the emerging needs from interactive broadcasting. Since a broadcasting program is created on the basis of its objects, it is considered that MPEG-4 is most suitable for interactive broadcasting contents production and it can be retrieved in terms of its properties. But, there is no system that protects the copyright of digital contents and manages copyright and possibility that contents producer and author's copyright receives infringement at process that exchange contents mutually rose very. Therefore, we need to control and distribute contents according to user's permission rights. In this paper, we present the authoring system based on MPEG-4 IPMP for copyright and protection of MPEG-4 contents. The main features of the proposed approach is to provide an MPEG-4 compliant IPMP authoring system in a plug-in type along with standardized interfaces, which is to be able to incorporated into an existing MPEG-4 content authoring system. In this way, it is capable of authoring content to the MP4 file format while accommodating protection and management of content in a unified way. Furthermore, it also allows a user to edit and/or author IPMP information in a more efficient way by offering form based user interfaces.
High-speed Hardware Design for the Twofish Encryption Algorithm
Youn Choong-Mo ; Lee Beom-Geun ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 201~204
Twofish is a 128-bit block cipher that accepts a variable-length key up to 256 bits. The cipher is a 16round Feistel network with a bijective F function made up of four key-dependent 8-by-8-bit S-boxes, a fixed 4by-4 maximum distance separable matrix over Galois Field
, a pseudo-Hadamard transform, bitwise rotations, and a carefully designed key schedule. In this paper, the Twofish is modeled in VHDL and simulated. Hardware implementation gives much better performance than software-based approaches.
Hardware Design of Standard Hash Algorithm HAS-160
Youn Choong-Mo ; Lee Beom-Geun ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 205~208
This paper is about the hardware implementation of the Hash algorithm, HAS-160, which is widely used for Internet security and authentication. VHDL modeling was used for its realization and the operation speed has been increased by the optimized scheduling of the operations required for step operations.
Hybrid Case-based Reasoning and Genetic Algorithms Approach for Customer Classification
Kim Kyoung-jae ; Ahn Hyunchul ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 209~212
This study proposes hybrid case-based reasoning and genetic algorithms model for customer classification. In this study, vertical and horizontal dimensions of the research data are reduced through integrated feature and instance selection process using genetic algorithms. We applied the proposed model to customer classification model which utilizes customers' demographic characteristics as inputs to predict their buying behavior for the specific product. Experimental results show that the proposed model may improve the classification accuracy and outperform various optimization models of typical CBR system.
Human Memorable Password based Efficient and Secure Identification
Park Jong-Min ;
Journal of information and communication convergence engineering, volume 3, issue 4, 2005, Pages 213~216
Almost all network systems provide an authentication mechanism based on user ID and password. In such system, it is easy to obtain the user password using a sniffer program with illegal eavesdropping. The one-time password and challenge-response method are useful authentication schemes that protect the user passwords against eavesdropping. In client/server environments, the one-time password scheme using time is especially useful because it solves the synchronization problem. It is the stability that is based on Square Root Problem, and we would like to suggest PBI(password Based Identification), enhancing the stability, for all of the well-known attacks by now including Off-line dictionary attack, password file compromise, Server and so on. The PBI is also excellent in the aspect of the performance.