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A Magnetic Flux Guide for a SQUID Microscope
김신환,Jung-Young Son,Dae-Hyun Jung,P.Pavlov Kharkov,박민철 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
The characteristics of magnetic flux transmission from the measurement point of a specimen to the SQUID through a magnetic flux guide are analyzed based on the experimentally-obtained magnetic field strength at each part of the flux guide. This analysis identifies the parameters that affect the performance of eddy current measurement systems based on a magnetic flux guide and a SQUID. With the parameters, a relationship is derived to calculate the sensitivity of the magnetic flux guide in the eddy current measurement system. The relationship will used to optimize the configurations of the sensing part of the system in design stage. It is also experimentally shown that shielding the magnetic flux guide will help to increase the spatial resolution in the system.
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광 회절 초음파 공명법에 의한 methyl acetate의 cis-trans의 회전이성 완화의 연구
김신환,배종림 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
Ultrasonic absorption measurements in methyl acetate have been carried out over the frequency range 0.1 - 10 MHz at temperature of 5-30℃ using a high-Q ultrasonic resonator method using optical diffraction which is useful for ultrasonic relaxation around 1 MHz. The results showed a typical spectrum of a single relaxation process, from which the relaxation frequency was determined. The temperature dependence of relaxation frequency gives the activation enthalpy(ΔH^(#)) between axial and equatorial isomers of methyl acetate, which are ΔH^(#)=6.6 kcal/mol.
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김신환,김성욱 한국통신학회 1997 한국통신학회논문지 Vol.22 No.6
Morphology is a shape preseving filter. Several morphology filter can be made by the combination of morphological basic operation. If we use morphology filter in decimation process for a hierarchical encoder, there are some advantagesin reduction aliasing effects. In this paper, we propose a new hierarchical coder with morphological filtering and vector quantization. And then, firstly, we confirm that CO filtering is the best one among the 4 kinds of morphology filters to reduce aliasing effects in Laplacian pyramid transmission proposed by Burt. Secondly, the those two coders was compared. The results of our simulation show that our new coder surpasser the Laplacian pyramid especially in complex images.
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디저화 영상의 다치추정을 이용한 중간조 영상의 단계적 전송에 관한 연구
김신환,이용두,황병원 한국통신학회 1990 韓國通信學會論文誌 Vol.15 No.9
디저법은 2치 영상이지만 인간 시각의 적분 효과에 의해 濃淡이 있는 영상처럼 보이게 하는 방법으로 위치에 따라 값이 다른 문턱값과 濃淡이 있는 영상의 화소값을 비교하여 화소값이 문턱값보다 크면 흰색(on), 작으면 검은색(off)으로 결정하는 수법이다. 본 논문에서는 디저영상으로부터 濃淡영상을 추정하는 새로운 다치추정법을 제안하여 그 결과가 종래의 방법보다 약 0.7dB 개선되었음을 보이고, 이 방법을 사용하여 영상의 새로운 단계적 전송 방법을 제안한다. This paper presents a new method of multilevel estimation of dithered images. A dithered picture, a two-tone picture which gives the illusion of picture with many shades of gray, is obtained by comparing the gray-level picture which gives the illusion of picture with a position-dependent threshold. When the intensity of a picture element exeeds the threshold it is classified as white: otherwise it is black. In the new estimation scheme, the simulation results show the SNR of the new method is improved 0.7dB compared with the old method. And we propose a new progressive image transmission by employing thie method.
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