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崔聖鎬 圓光大學校 文理科大學 國語國文學科 1981 國語 國文學 硏究 Vol.7 No.-
Seongsanbyeogok is a collection of descriptive poems expressing beautiful seasonal changes of scenery of Seongsan; and the comfortable life in quiet retirement of the hero, that is, his reading, convivial mood, and elegance of playing string instrument. These poems were composed, out of longing for and envy of Kim Seong-won, Seohadang, by Songgang. In commenting Songgang's works, all of them have been eulogized as original, creative masterpieces, epoch-making loftiest works but Seongsanbyeolgok. The write, while considering the value of these poems produced in his native country, noticed that the names of places, famed spots have not been clarified, resulting in difficulty in understanding and annotating Songang's works. This motivated the writer to do this research. The writer surveyed the activities of poems and songs in Honam area as remote causes of Songgan's composition; and as direct causes, he investigated Seongsan poem site in Shingyeongjeong bower, and summerhouses concerned that served as poem sites, and visitors to these summerhouses and bowers, thus trying to find the significance of how those poems were produced. Then, the writer considered the relationship between the personalty of Seonggang as a lyrical poet and his life in retirement at Seongsan; clarified his opinion concerning the year of composition where various opinions collide; attempted to correct ambiguous annotation coming from ignorance of the names of places and famed spots; thus hoping to contribute to the correct understanding of his works. And in the consideration of the contents, main emphais was placed on the plot and expression in order to reveal the value of these poems.
최성호,이병환,이철수,정의림,Choi, Sung-Ho,Lee, Byung-Hwan,Lee, Chul-Soo,Jeong, Eui-Rim 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.1
본 논문에서는 다중 대역 전송 시스템에서 광대역 전력 증폭기의 선형화를 위한 새로운 전치왜곡 기법을 제안한다. 특히, 한 시스템에서 동시에 다중대역/다중모드 신호를 전송함에 있어 다중대역 신호가 하나의 전력 증폭기에 의해 증폭되어 전송되는 시스템을 고려한다. 상호 대역 간 비선형 왜곡을 포함한 비선형 특성을 보상하기 위하여, 본 논문에서는 다중 전치왜곡기 블록을 갖는 새로운 전치왜곡 구조를 제안하며, 다중 전치왜곡기의 계수를 동시에 갱신하는 적응 알고리즘을 제안한다. 제안하는 다중 대역 모델을 검증하기 위하여 상용 증폭기를 사용하여 증폭기 모델을 추출하였으며, 추출된 모델을 기반으로 제안한 알고리즘을 모의실험을 통해 검증하였다. 모의실험 결과는 제안 알고리즘이 효과적으로 다중 전치왜곡기의 계수를 구할 수 있으며, 다중 대역을 효과적으로 선형화 할 수 있음을 보여준다. New digital predistortion technique is proposed for power amplifier linearization in multi-band transmission systems. We consider a system where muli-band signals are combined and amplified by a single power amplifier (PA). In this system, the PA output is distorted by the nonlinear cross-products between different band signals as well as their own nonlinear self-products. To compensate these nonlinear effects, we propose a multiple PD structure. Each PD removes the nonlinear cross-products and self-products to mitigate the spectral regrowth for the corresponding band. Since the PD parameters for different bands are linked together, it is difficult to find the PD parameters separately. Thus, we propose an iterative method for finding the PD parameters jointly. For demonstration of the proposed method, multi-band characteristics of PA are extracted from a commercial power amplifier. Computer simulation was executed based on the PA parameters. The simulation results show that the proposed method can effectively linearize the PA and remove spectral regrowth at each signal band.
반복적인 펄스레이저 조사에 의한 알루미늄 합금의 표면상태 변화분석
최성호,김정석,장경영,신완순,Choi, Sung-Ho,Kim, Chung-Seok,Jhang, Kyung-Young,Shin, Wan-Soon 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.5
The objective of this study is to investigate the thermal behavior on material surface and the variation in the surface morphology of aluminum 6061 alloy by the Nd:YAG pulsed-laser irradiation. First, we predicted the surface temperature variation during pulsed-laser irradiation by using the two dimensional finite element analysis. When the pulsed-laser of 133 mJ energy and 5 ns pulse duration is irradiated on the surface of aluminum alloy, the material surface is thought to be melting because the surface temperature rises steadily up to about $660^{\circ}C$ exceeding the melting point. Also, the experimental results show that the solidification microstructure has been developed clearly after surface melting. Second, the diameter of melted zone was analysed by finite element analysis and measured by OM(Optical Microscopy). It increased logarithmically with increase in the number of laser irradiation. In addition, AFM(Atomic Force Microscopy) measurement showed an increase in the average surface roughness during pulsed-laser irradiation.