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최경주,김종택 경북대학교 공과대학 1975 工大硏究誌 Vol.4 No.-
n-butyraldehyde 용매 속에서 중합된 PVC 단결정 mat의 결정구조를 i.r. , X선 회절과 2차원의 Fourier 합성으로 밝혔다. 공간군은 Pacm(D^11_2h)이었고, 다위격자 상수 a=10.15A˚, b=5.17˚, c=5.16A˚인 사방정계이었다. The crystal structure of PVC(poly vinyl chloride) single crystal mat which was poly merized in n-butyraldehyde was determined by i.r., X-ray diffraction technique and two-dimensional Fourier synthesis. The space group is Pacm(D^11_2h). It is orthorhombic, with unit cell parameters; a=10.15A˚, b=5.17A˚, c=5.16A˚.˙
β-Difluoro-α-trimethylsilyl-γ-lactam 유도체의 합성
채규윤,곽경철,문재정,최장호 圓光大學校 基礎自然科學硏究所 2000 基礎科學硏究誌 Vol.18 No.1
α-위치만 선택적으로 difluoromethylene기가 도입된 α.α-difluoro-γ-trimethylsilyl-γ-lactam 유도체(6)들은 ethyl α.α-difluoro-γ-trimethylsilyl-γ-iodopentanoate(4)는 일차아민 유도체와의 반응으로부터 비교적 편리한 작용조건과 비교적 좋은 수득률로 합성하였다. The target of α.α-difluoro-γ-trimethylsilyl-γ-lactam derivatives(6) with selectively in corporated difluoromethylene on α-position were readily prepared form reaction ethyl α.α-difluoro-γ-trimethylsilyl-γ-iodopentanoate(4) and primary derivatives in moderate yields.
단일 주파수에서 선행음 및 후속음이 음원의 방향지각에 미치는 영향
이채봉,김경미,차경환 東西大學校 1999 동서논문집 Vol.5 No.-
In this paper, the effects leading and following tone with single frequency on sound localization were investigated. The sound with level difference and ISI(Inter Stimuli Interval) were used. The width of test sound was 2ms, leading tone and following tone were 10ms and 1kHz was used. The arrived time difference of subject's ears 0.5ms. We compounded with four kind of the level difference 0,-10,-15,-20dB interval for the one ISI. We knew the fast that leading tone had more effect on sound localization than following tone.
강경아,이기준,정채영 조선대학교 통계연구소 1999 統計硏究所論文誌 Vol.1 No.1
In this paper, implemented the algorithms that recognize the image learning the standard data by Back propagation and Hopfield network of neural network Back propagation learning method needs more hours in carrying out one-time learning due to the hopfield algorithm, but in the rate of detection per learning frequency, back propagation shows an excellence. Back propagation learning algorithm requires 25 seconds to obtain the rate of 97% detection of the image, but to detect the image over 99%, the time of 1 minute and 20 seconds is required and while the rate of image recognition is very high in initial learning, it is delayed from over 97%. To the contrary, in the case of hopield network, more hours are required to recognize 97% of the image than back propagation, but in recognizing the image over 99%, it requires shorter hours than back propagation.
이채봉,차경환 東西大學校 1998 동서논문집 Vol.4 No.-
In this study, the effects leading and following tone on sound localization were investigated. The tone with level defference and ISI(Inter Stimuli Interval) was used. The width of test tone was 2ms, leading tone and following tone were 10ms and white noise were used. The arrived time difference of subject's ears was 0.5ms. We compounded with five kind of the level difference by -5dB interval for the one ISI. We knew the fact that leading tone had more effect on sound localization than following tone.
액체소듐속에서 소듐-물반응에 의한 재질의 Wastage현상
정경채,정지영,김병호,김태준,최병해,최종현,김의식 한국공업화학회 2003 응용화학 Vol.7 No.1
In this study we observed and analyzed the corrosion phenomena in leak site and the effect on temperature at the target surface of heat transfer tube material by sodium-water reaction through water leakage in liquid sodium atmosphere. Surrounding of leak hole of the specimen was damaged by the wastage phenomena due to corrosion and erosion of material, and hole size by damage of leak site was extended from 150㎛ to about 200㎛. Also, the damaged size appeared in the target surface was observed to about 1000㎛ diameter. The temperature of target surface increased about 70~80℃ by the heat of sodium-water reaction even with the small leakage of 15㎖ water. From the results of EPMA and EDX analysis, damaged area are found to covered with complex compounds such as (NaOH+Na_2O) FexOy or (NaCrO_2+nA_2CrO4) mixed up with the sodium oxides by sodium-water reaction and the Fe or Cr element by matrix of tube sodium oxides by matrix of tube material.
金在慶 대구교육대학교 1969 論文集 Vol.5 No.-
In this study, it was revealed that the primary object of astronomy education should aim at helping form a synthetic view of nature, based on both the history of natural science and the first item of the object of the natural science education explained in the primary school curricula and the best way to reach such an object should be to have the movement of the earth dealt with as main subject. The problems to be aroused in teaching the movement of the earth were studied centering on the Teacher's Guide and, to solve them, a conclusion was arrived at that teaching should be performed, with relativity as main conception. This kind of attempt can be seen made in the SCIS Elementary Science. Here I made a tentative plan particularly on the processes of using the fixed star as reference frame and teaching its superiority.
한경희,채인숙,박정숙,최미숙,정순둘 한국식생활문화학회 2002 韓國食生活文化學會誌 Vol.17 No.5
The purpose of this study was to evaluate the diet quality of the menus delivered by 17 free meal service centers for the low-income home-bound elderly in Chung- cheong buk-Do. Statistical data analysis was compleleted using the SPSS package program for descriptive analysis, T-test, and ANOVA. The meals offered by free meal service centers were not met the 1/3 recommended dietary allowances in calcium and vitamin B_2. There were significant differences between dependent variables(nutrient content, nutrient density, nutrient deficiency, NAR, MAR, food group intake patterns) and independent variables (operation type, operation status, operation period, nutritionist, food cost).