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- 저자 : 柳康熙 (검색결과 148 건)
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유강희 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
This paper describes the procedure to get full mesh connectivity in WDM ring networks. The number of wavelengths as well as maximum hop numbers are calculated for both odd and even number of nodes on the ring to get full mesh connectivity. Using matrix approach, optimal wavelength assignment algorithm for the full mesh connectivity is presented. Additional work presented is the performance comparison among several types of WDM ring networks such as fiber-mesh, WDM-XC, WDM-ADM. We observe the trade-off between link cost and node cost in WDM ring networks for the performance comparison.
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광 부호분할 다중전송에서 부호길이에 따른 BER 영향분석
유강희 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-
BER characteristics of the optical code division multiple transmission due to code length has been analyzed. Using the given subscriber number as well as input optical power, the network performance factors such as SINR, BER are calculated. The performance become better according to increasing code length as well as input optical power. But subscriber number increase make performance wrong due to interference. This paper describes the calculated results of the SINR as well as BER according to the variation of code length.
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유강희 한국교통대학교 2017 한국교통대학교 논문집 Vol.52 No.-
In last few years, the increasing use of LEDs in illumination system make the emergence of Visible Light Communication(VLC), in which wireless data communication is performed by transmitting through the visible band of light. In this paper, wireless communication system using LED’s for car-tocar communication is introduced and the transmission performance are analyzed for the link. In particular, horizontal seperation between two cars and reflection from the neighbor car make the transmission performance degradation. The delay time between line of sight signal and reflected signal caused inter-symbol interference. Performance analysis such as noise of optical receivers, signal to noise ratio, inter-symbol inteference and maximum transmission speed due to horizontal seperation as well as reflection are calculated. This paper described the details of the simulation results.
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평행 결합 λ/4 마이크로 스트립 선로를 이용한 2.488 ㎓ 대역통과 여파기의 설계 및 제작
柳康熙 충주대 2001 한국교통대학교 논문집 Vol.36 No.2
This paper describes the realization details of the 2.488GHz bandpass filler using parallel coupled λ/4 microstrip lines. A bandpass filter using parallel coupled microstrip lines is analyzed in terms of admittance inverter in equivalent circuit as well as even/odd mode characteristic impedances. The designed bandwidth of 10% at the center frequency of 2.488GHz is realized by using super-compact CAD optimization. Measured results of the fabricated bandpass filter is in good agreement with the simulation data, but the measured attenuation is slightly higher than those of the designed value.
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柳康熙 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1
This paper presents frequency difference detector method which can be used in frequency locking the wavelength of a local VCO laser diode to the reference wavelength fed from OFDM network. The basic structure of the proposed frequency difference detector is based on the master-slave configuration. The optical signals from the reference master laser source and local slave VCO laser are heterodyned on a photo detector, resulting in the microwave output signal corresponding to the difference frequency between two input optical signals. The output electrical difference signal is then compared to the microwave reference frequency through the mixer and OP amplifier as a frequency difference detector. The final difference signal output is filtered and integrated by the integrating loop filter for the frequency locking, and it is delivered to the current source of local VCO laser diode causing its output wavelength change corresponding to the input difference signal. Through experiments with the calculated parameters, we confirmed that the frequency difference detector simply develops an error component that is proportional to the frequency difference between heterodyned optical signals and a reference 1.5GHz microwave oscillator. The achieved locking range of the VCO laser diode is around ± 200 MHz.
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유강희 忠州大學校 2008 한국교통대학교 논문집 Vol.43 No.-
Transmission performance of the optical code division multiple access network has been analyzed. Using the modified PN code and FBG, multiple access interference among the users is effectively depressed. The major factors that influenced transmission performance are the noises such as N_(th), N_(shot), N_(sig-sp), N_(ein). It is found that excess intensity noise N_(ein) is very important factor in case of the high power optical input at the receiver. This paper describes the calculated results of the SNR as well as BER according to the variation to the subscriber number M and the input optical power.
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유강희 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-
A full 360° reflection type analog phase shifter has been realized with four varactors and 90° branch coupler. The analytic formulars for the phase shift and insertion loss have been derived and applied to the design of the circuit. A new design technique for the large phase shift is applied using short stub microstripe lines. Through the experiment using the microstrip line and varators, the phase of 10GHz signal is controlled to the 0-12V DC voltage with the phase shift range of 360°. The achieved insertion loss of less than 3dB are achieved over all phase states.
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柳康熙 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2
The noise characteristics of the optical frequency locked loop are analyzed in terms of shot noise of the photo detector and phase noise of laser diode, and its contribution to phase error variance of the loop is estimated. Using calculation results of phase error variance with the commercially available electronics as well as optical components, the influences of optical phase noise for the optical frequency locking are discussed.
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