두가지 동기방식을 이용한 카오스 주파수천이 변조회로의 설계

安秉根,朴廣炫 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

For the purpose of the secure communication, a study of the modulation circuit of chaotic frequency shift keying is presented. In this paper, the modulation citcuit of chaotic frequency shift keying was designed with two synchronization methods-the coupled and the drive synchronization. The designed circuit was simulated for the cases of no-load, 1K-load,3.6K-load and load of opeational anplifier respcetively. As a result of simulation,two chua's circuits which genitate two chaos signals,using coupled synchronization method is not affected from the output stage by using the operational amplifier for drive synchronization.

PC와 PLC를 이용한 제어에 관한 연구

崔英奎,安秉根 충주대학교 1993 한국교통대학교 논문집 Vol.27 No.-

As programmable logic controllers (PLC) have become more cost-effective and more powerful, they have been used in a large number of industrial applications. A model plant application is used to enhance the discussion further and to highlight the abilities of today's modern, more powerful, PLC in hopper and mixing system. Local area networks(LAN) are recently developed solution to the problem and appear to provide a communications network for true factory automation. So PC provide low-cost graphic display, data collection, and management analysis. An example of a control in industrial process, communication method between PLC and PC is presented.

실내무선채널에서의 전파모델링에 관한 연구

權熙勳,安秉根 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2

A mobile channel model is a set of mathematical expressions into which channel characteristics obtained from field measurements can be inserted. This is done in order to predict the potential performance of a proposed mobile communication system. The basis for a medel may be either theoretical or empirical, or a combination of these two. In this paper propagation models be modeled and compared in the mobile-radio channel for indoor environment.

경호업 종사자의 직무유형과 동기수준 및 직무만족의 관계

안병근,정위곤,전명만,유철수 龍仁大學校 武道硏究所 2002 武道硏究所誌 Vol.13 No.1

The purpose of this study was to analyze the relationship between motivation level, job satisfaction along with private security employees job style. For accomplishing this purpose of the study, the 262 subject were selected by the cluster random sampling method from private security employees in 6 private security companies located in Seoul and Kyoung-gi do. The survey questionnaires were used to collect data. The questionnaire for motivation level was developed by Frills and Knox(1972), Quinn and Shephard(1978) and standardized in Korean language by Young-In, Hur(1995) and the job satisfaction was developed by Rizzo(1970) and standardized in Korean language by Yong-Nam, Joo(1993). The statistical methods utilized in this study for analyzing the collected data were reliability analysis, descriptive statistics, Chi-square, t-test, One-way ANOVA, and standard multiple regression analysis. From the analysis of this study, the following conclusions were obtained: Firstly, the motivation level, job satisfaction along with private security employees are partially different by the socio-demographic characteristics. Secondly, the motivation level is not different by the private security employees job style. Thirdly, the job satisfaction is partially different by the private security employees job style. In detail, in job condition along with job style, safe employees are more satisfaction than security employees. Lastly, the motivation along with private security employees influence on the job satisfaction. In detail, the achievement needs, role conflict, and autonomy influence on the job condition and also the role conflict and autonomy influence on the role value.

1. 5㎛ CMOS 표준셀 라이브러리의 개발에 관한연구

崔英奎,安秉根 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-

In this paper, we present the CMOS standard cell library using the N-well method with 1.5μm polysilicon gate design rule. Total 102 cells of random logic gates were made to have the equal height of 100μm. We will add some more this library. also collect many kind of informations layout by standard cell. This cells will be useful to design the digital system.

버퍼 크기에 따른 SR ARQ 기법의 정보 전송률 분석

권희훈,안병근 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.3

A New procedure for handing retransmission in a selective-repeat ARQ system is proposed in this paper. This procedure can operate with a receive buffer of minimal size, in addition it place a little computational load on the transmit and receive processors. The procedure is simple enough that its throughput can be calculated exactly. Analysis of this strategy show that 1) it yields higher throughput than earlier ARQ techniques, 2) its throughput differs a little from channel capacity, for modest receive bugger size, 3) throughput approaches channel capacity, as buffer size increases. The final chapter of the paper considers the performance of ARQ system on channels in which errors in bursts. It indicates that, error burstiness has a little effect on throughput on resonable good channels.

다중경로 페이딩 채널에서의 불완전 동기된 DS/SS 시스템 분석

김희훈,안병근 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.3

In analyzing the performance of the system, depending on the peripheral circumstance this study modeled Multipath Fading Channel with Nakagami-m Fading Channel which can be applied into various channel situation. After assuming the phase differences with the signal which occurred with the PLL both the receiving signal and the receiver to the Phase Error, In considering the roof benefit of PLL this study analyzed how the average SNR of the signal received through each path affects the BER of the system through simulation.

IIR 디지털 필터의 파이프라인 방법

權熙勳,安秉根 충주대 2000 한국교통대학교 논문집 Vol.35 No.2

Recursive digital filter are more difficult to design especially for linear phase; these are suffer from roundoff noise, quantization noise and limit cycle oscillations.In addition to noise behavior, other hardware related performance issues such as speed, area and power are need to be considered.In VLSI implementations, study of properly scaled structures is important since these systems can be implemented using the same word-length for all the signal in the entire system.Pipelining involves placing latches at appropriate locations and reduces critical path, This leads to an increase in clock rate as well as signal sample rate.Alternatively, where achieving high speed is not important, the pipe-lined topology can be operated with lower supply voltage for lower power.Low power consumption is extremely important in portable applications for increasing battery life, While non-recursive digital filters can be pipe-lined at arbitrary levels, recursive falters cannot be easily pipe-lined due to the presence of feedback loops.This paper presents pipe-lined topology for recursive digital filters using look-ahead transformation and constrained filter design approaches.

다중경로 페이딩체널하에서의 DS/CDMA 시스템의 성능분석

權熙勳,安秉根 충주대 산업과학기술연구소 2000 産業科學論文集 Vol.8 No.-

When a signal is through a multipath fading channel, multiple copies of the original signal will be received due to scattering and reflections in the medium. The amplitude of these independent multipath signals can be time-varing, do can their delays, and phase. Since the variations are largely unpredictable, the multipath fading channel is best described in statistical terms with random and time variant characteristics. In this paper the system modeled DS/CDMA-QPSK system. For the system analyze error probability equation and maximum user number obtained over AWGN channel. System performance analyzed in rayleigh and rician fading over multipath fading channel.

Microcomputer-Based Digital System for the Configuration Detection

An, Byung-Gun,Kwon, Hi-Hoon 충주대 2001 한국교통대학교 논문집 Vol.36 No.2

This paper describes a digital system which detects the configuration of any RS-232C cable that has 25 pin connectors at both on end.The system uses a single chip microcomputer as the system controller for flexibility and cost effectiveness.The system controller sends the configuration information to a PC to be displayed on the CRT screen.A software program which controls the overall operation of the system is also described.The system can be further expanded universal configuration detector by adding programmability on the number of pins