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RISS 인기검색어
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- 저자 : 李載萬 (검색결과 388 건)
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이재만 群山大學校 自然科學硏究所 1991 自然科學硏究 Vol.6 No.-
By recent development of new recording material and its processing, the possibility of higher level utilization of color holography became reality. In this paper, the technique for recording the color hologram are discussed and the method for obtaining the natural color image is presented for Lippmann hologram using ho hographic stereogram. This method is possible to get the sharp and bright image with only one recording wavelength. There is no restriction of the scene to be recored. One of the promising application of this method is the recording and preservation of the cultural assets and medical specimen.
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李在萬 군산대학교 1975 論文集 Vol.9 No.1
J. Piaget exclaimed that the acquisition of the conservative concepts of the child is impossible before reversible thinking period. However, the present study aimed at investigating the mechanism in the development of the recognition of nature, compared with J. Piaget's genetic epistemology. One fundamental hypothese was proposed as follows : It is possible that the children of five, who have acquired conservation of substance by the synthetic judgement, can perform logical reversible operation in thinking as a result within the limits of the meaning about the proposition, when they transform the synthetic judgement into the analytic one. In the one hand as J. Piaget says, the children acquire the concept by logical operation in thinking. On the other, they acquire the concept by synthetic judgement. As a result, I have got an information on the mechanism of the development of natural recognition of children.
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죽엽이 알콜 투여로 유발된 흰쥐의 고지혈증과 간 손상의 예방에 미치는 영향
이재만,서부일,박지하,노성수 대한본초학회 2011 大韓本草學會誌 Vol.26 No.3
Objectives: This study was performed to investigate the effect of water extracts from Phyllostachys Folium(PF) on hyperlipiderma and liver damage induced by alcohol. Methods: Except for the normal group, we fed rat on 25% alcohol for 55 days. And extract was administrated for the same period. We measured the serum component in rat`s blood, body weight and weight of liver. Results: At first, we observed effects of PF on hyperlipidemia induced by alcohol. PF group didn`t show significant change of total cholesterol in comparison with those of the control group. PF group showed significant increase of HDL(High-Density lipoprotein) cholesterol in comparison with those of the control group. PF group showed significant decrease of triglyceride in comparison with those of the control group. PF group showed significant increase of body weight in comparison with those of the control group at 4weeks and 8weeks. At second, I observed effects of PF group on liver damage induced by alcohol. PF group showed significant decrease of GOT, GPT, ALP and LDH in comparison with those of the control group. PF group showed significant increase of liver weight in comparison with those of the control group. Conclusions: Reviewing these experimental results, it appears that water extracts from Phyllostachys Folium(PF) have pharmaceutical efficacy on hyperlipidemia and liver damage induced by alcohol. Therefore further additional study should be conducted to elucidate in depth the pharmaceutical efficacy of these.
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Determination of global ice loads on the ship using the measured full-scale motion data
이재만,이춘주,김영식,최걸기,류재문 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.4
This paper describes the whole procedures to determine ice-induced global loads on the ship using measured full-scale data in accordance with the method proposed by the Canadian Hydraulics Centre of the National Research Council of Canada. Ship motions of 6 degrees of freedom (dof) are found by processing the commercial sensor signals named Motion Pak II under the assumption of rigid body motion. Linear accelerations as well as angular rates were measured by Motion Pak II data. To eliminate the noise of the measured data and the staircase signals due to the resolution of the sensor, a band pass filter that passes frequencies between 0.001 and 0.6 Hz and cubic spline interpolation resampling had been applied. 6 dof motions were computed by the integrating and/or differentiating the filtered signals. Added mass and damping force of the ship had been computed by the 3-dimensional panel method under the assumption of zero frequency. Once the coefficients of hydrodynamic and hydrostatic data as well as all the 6 dof motion data had been obtained, global ice loads can be computed by solving the fully coupled 6 dof equations of motion. Full-scale data were acquired while the ARAON rammed old ice floes in the high Arctic. Estimated ice impact forces for two representative events showed 7e15 MN when ship operated in heavy ice conditions.
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李在萬 群山大學校基礎科學硏究所 1992 基礎科學硏究 Vol.7 No.-
This study introduces a new method-measurement of the electrical resistance of Ag layer-a function of the guantity of the Ag photodissolved to study the kinetics of the Photodissolution of Ag in amorphous As₂S₃. We have concluded from our kinetics data that the electrical resistance i.e. Photodissolution of Ag in As₂S₃is composed of two independent processes. First, as the dominant process in what we have referred to as stage 1, there is an accumulation of radiation damage in the As₂S₃. This can even be accomplished by pre-illumination of the As₂S₃prior to deposition of the Ag layer. It is natural to associate this process with the many observations of photo-darkening/Photo-bleaching in As₂S₃. These effects appear to be combinations of atomic rearrangements and charge trapping. Whatever this radiation damage may be, the fact that the photodissolution exhibits an induction period shows that there is a certain minimum damage required before the Ag can dissolve into the As₂S₃. The second process, which dominates what we have referred to as stage 2, procedures a constant photodissolution rate. We can sum up our conclusion concerning the photodissolution mechanisms as, first there must be critical accumulation of radiation damage. Then, light can assist the Ag atom to cross the interfacial activation barrier by either of two processes s:photo-assisted jump or activation barrier lowering. As far as our experiments could resolve, the illuminations have the same wavelengths in photodoping.
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이재만,장덕준 安東大學 1991 安東大學 論文集 Vol.13 No.1
본 연구에서는 신뢰도함수의 비모수적 추정량으로 Kaplan과 Meier의 추정량과 Nelson형 추정량의 소표본 특성을 관찰중단률과 수명분포의 유형을 고려하여 평균제곱오차의 관점에서 비교분석한 결과 다음의 결과를 얻었다. 신뢰도의 참값이 0.2이상인 경우에는 Nelson형 추정량이 Kaplan과 Meier의 추정량보다 평균제곱오차의 관점에서 더 유효하다. 신뢰도의 참값이 0.1근방으로 낮은 경우엔 Kaplan과 Meier의 추정량이 Nelson형 추정량보다 더 유효하다. 위의 결과로부터 대부분 높은 신뢰도를 유지하려고 하는 신뢰도 관리의 실용적 측면에 부합되는 추정량은 Nelson형 추정량임을 알 수 있다.
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