• Proceedings of the Korean Information Science Society Conference
• /
• 2001.10a
• /
• pp.709-711
• /
• 2001

본 논문에서는 유한 확대 체 GF($^{m}$ )상에서 셀룰라 오토마타를 이용한 곱셈기 구조를 제안한다. 제안된 구조는 기약 다항식으로 AOP(All One Polynomial)의 특성을 사용하고 LSB방식으로 곱셈 연산을 수행한다. 제안된 곱셈기는 지연시간으로 m+1을 갖는 임계경로로는 1- $D_{AND}$+1- $D_{XOR}$를 갖는다. 특히 구조가 정규성, 모듈성, 병렬성을 가지기 때문에 VLSI구현에 효율적이다.적이다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.04d
• /
• pp.536-538
• /
• 2003

우리는 4G 셀룰라 망에서 hot spot 셀 문제를 해결하기 위해 핸드오프 시간을 동적으로 사용하는 기법을 제안한다. 즉, hot spot 셀에서 나가는 핸드오프는 가능한 빠르게 수행하여 셀 부하를 줄이고 hot spot 셀로 들어가는 핸드오프는 가능한 느리게 수행하여 사용자의 연결 품질을 최대한 고려하는 알고리즘이다. 4G 망의 특징을 고려하여 hard handoff 절차를 가지면서 기존의 mobile-assisted network-controlled handoff를 그대로 사용하여 36에서의 전이가 용이하다. 그리고 mobile IP 분야에서 연구되던 사전 등록 기법과 버퍼에 의한 저장 기법을 활용하여 핸드오프의 신뢰성을 높였다.

• Information and Communications Magazine
• /
• v.3 no.1
• /
• pp.71-76
• /
• 1986

• Information and Communications Magazine
• /
• v.9 no.9
• /
• pp.54-60
• /
• 1992

• Information and Communications Magazine
• /
• v.9 no.2
• /
• pp.15-24
• /
• 1992

• Journal of the Korean Association of Geographic Information Studies
• /
• v.11 no.1
• /
• pp.1-9
• /
• 2008

Recently, various researches have been studied on the predict method of land change according to its development. The Cellular Automata(CA) is one of the most popular methods in the urban growth modeling. The basis principle of CA is to repeat operations, which convert the current cell into new cell state by the transaction rule. It will minimize the loss of data by using Fuzzy-AHP and it can lead the flexible urban growth modeling. However, AHP would have a disadvantage to repeat the procedure of the collecting intentions until it derives the weight. Also, it is necessary for the simulation of CA to repeat the operations and the test of data accuracy should be accompanied. The purpose of this study is to predict the Busan city growth model and analyze it according to the automated test method by applying CA as well as Fuzzy-AHP. This study shall improve the difficulties caused by complexity and repetitiveness in the urban grow modeling. The practical modeling could be derived from the verification, and the derived modules could be applied to the similar case studies.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
• /
• v.5 no.1
• /
• pp.22-30
• /
• 1994

The error probability of the DS-CDMA / DPSK cellular mobile communication system with CCI canceller and MRC diversity reception technique has been analyzed in the cellular radio channel which is characterized by AWGN, Multi-User Interference(MUI) and m-distribution fading. System capacity i. e., number of user per cell has been derived and the evaluated results are shown in figures as a function of PN code sequence length, fading index, BER, number of diversity branches and $E_b/N_o$, Here, the voice activity factor is assumed to be 3/8, the number of sectors in a cell 3 and Multi-User Iner- ference is modeled as Gaussian process.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.7 no.3
• /
• pp.118-125
• /
• 2004

The purpose of this study is to decide an appropriate neighborhood and a transition rule of cellular automata by analyzing the past growth process of urban areas in Gimhae. With cellular automata which can manage the change based on the dynamic model and time, this study analyzes the urban growth of Gimhae from 1987 to 2001. Also, through the simulation of different types for neighborhood and transition rules, we can find the appropriate neighborhood and the transition rule for Gimhae. In conclusion, the forecast of physical urban growth pattern is more accurate under conditions when the number of matrixes for the neighborhood is small, the shape of the neighborhood is rectangular, "${\alpha}$" value, which control the pace of urban growth, is low and the transition possibility ($P_{ij}$) is high.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.19 no.11
• /
• pp.2576-2583
• /
• 2015

In a full-duplex (FD) wireless cellular network, uplink (UL) users induce the severe inter-user interference to downlink (DL) users. Therefore, a user scheduling that makes a pair of DL user and UL user to use the same radio resource simultaneously influences the system performances significantly. In this paper, we first formulate an optimization problem for user scheduling to minimize the occurrence of outage, aiming to guarantee the quality of service of users, and then we propose a suboptimal user scheduling algorithm with low complexity. The proposed scheduling algorithm is designed in a way where the DL user with a worse signal quality has a higher priority to choose its UL user that causes less interference. Simulation results show that the FD system using the proposed user scheduling algorithm achieves the optimal performance and significantly decreases the outage probability compared with the conventional half-duplex cellular system.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.8C
• /
• pp.689-696
• /
• 2010

The goal of this paper is to present a novel method for protecting digital image using 2-D cellular automata transform (CAT). A copyright and transform coefficients are used to generate a new content-based copyright and an original digital image is distributed without any hidden copyright. The parameter, which is called gateway value, for 2-D CAT is consisted of rule number, initial configuration, lattice length, number of neighbors, and etc. Since 2-D CAT has various gateway values, it is more secure than conventional methods. The proposed algorithm is verified using attacked images such as filtering, cropping, JPEG compression, and rotation for robustness.