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광음향분광법에 의한 AI_2O_3:Cr 결정의 Cr^3+이온의 비복사천이과정 연구
남상돈,최복원,문병기 부산교육대학교 과학교육연구소 1985 科學敎育硏究 Vol.10 No.-
Photoacoustic spectroscopy is applied to study the nonradiative processes of Cr^3+ions in Al_2O_3:Cr^3+ crystal at room temperature. Three spectra, photoacoustic spectrum, luminescence excitation spectrum and optical absorption spectrum, are compared. It is shown to be possible to identify the modes of the relaxation processes of Cr^3+ ions in crystal by comparing photoacoustic spectra with luminescence excitation spectra. Furthermore, it is shown that the photoacoustic spectroscopy can be used to identify the forbidden transitions and the spin doublet energy levels of Cr^3+ ions in Al_2O_3:Cr^3+. These experimental data are in good agreement with the crystal field calculations. The relaxation process from ^2T_1 or ^2T_2 to ^4A_2 is dominantly nonradiative. However, the relaxation from either ^4T_1 or ^4T_2 to ^4A_2 is consist of the nonradiative relaxation process(^4T_1→^2Eor^4T_2→^2E) followed by the radiative relaxation process(^2E→^4A_2)
各種製劑에 使用되는 安定劑의 含有比率이 經時變化에 미치는 影響에 關한 硏究 (I) : 外用製劑에 含有된 防腐劑의 含量測定에 關한 硏究
金尙敏,李啓胄,曺秀悅 同德女子大學校 1969 同大論叢 Vol.1 No.1
The colourimetric determination of benzalkonium chloride or benzethonium chloride in the topical preparations were investigated. The results are as follows: 1) The wave length of maximum absorbence of benzalkonium chloride or benzethonium chloride were 617 mμ. 2) The limits of measurement of benzalkonium chloride or benzethonium chloride were 10~60r/ml. 3) Benzalkonium chloride or benzethonium chloride were precisely determined even in the presence of various components except of coloured matters, dyes and iodine, etc. .
남궁기,이호영,민성길 大韓神經精神醫學會 1990 신경정신의학 Vol.29 No.4
An epidemiological study on hwabyung was done with 1,450 subjects randomly selected from general population with age ranging from 18 to 65 year in a rural community. Data was collected using Korean version of DIS-III A by trained interviewers. The analysis of data showed that hwabyung is more common in older age group, in women and in low educational group. Diagnostically, hwabyung patients had more somatization disorder(37.7%), generalized anxiety disorder(24.6%) and major depression(15.25%), dysthymic disorder(15.25%) than non-hwabyung group had. A fewer number of hwabyung patients had panic disorder, obsessive compulsive disorder and phobic disorder. More hwabyung patients considered their general health state as being not good, had taken psychotropic medication, and reported psychiatric problem in the family. In general, this study suggests that hwabyung is a culturally-related syndrome of Korea which is commonly seen in a specific population group and diagnostically confounded with somatization, depressive and generalized anxiety disorders, representing typical clinical manifestations of wide range in their severity.
메탄올 자화성 Hyphomicrobium sp. A-12의 특성 및 단세포 단백질(SCP)의 생산
李啓瑚,裵星美 서울大學校 農科大學 1987 서울대농학연구지 Vol.12 No.1
126 methanol-utilizing microorganisms were isolated by enrichment techniques from the samples of soil, sewage, spoiled milk and decomposed sweet-radish pickles. One of them was selected to produce Single Cell Protein(SCP) and identified as a strain of genus Hyphomicrobium on the basis of taxonomical characteristics. The concentration of methanol affected the productivity. Hyphomicrobium A-12 well-adapted in 1%(v/v) methanol medium came to grow best in 1.6%(v/v). The growth was inhibited in higher than 2%(v/v). The optimal temperature and pH for growth were 30℃ and 7, respectively. The strain didn't necessarily require the growth factors, but 1%(w/v) yeast extract had a stimulating effect on its growth. The productivity was 6.5g dry cells/ℓ in batch culture with 1.6% methanol and the cell yield was 0.33gg-1. The oxygen consumption rate(QO2) was 6.1㎕/mg dry wt./hr when the substrate was methanol. The protein content of the cell was 72%(w/w) while the amino acid content was 54.8%. The nucleic acid content as RNA was 13%.
空間構文理論을 통해서 본 忠州大學校 캠퍼스 空間構造 分析
柳相圭,申桂鍾 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2
This Study intents to figure out the spatial structure of university campus using space syntax. Space Syntax is an objective and percise quantitative method of description that can indicate how well built environment functions. This paper attempted to represent the spatial structure as a axial map, and analyze the spatial configuration in terms of space syntax model. On the basis of the analysis, an alternative was proposed, in respect of pedestrians and vehicles movement. Preparing the spatial configuration values in the alternative with the present's, the change of some spatial structure, proposed in the alternative, improved mean depth, control value, and integration of study area. Thus, in the planning process of university plan, planners can use the space syntax methodology to control the roots of pedestrians and vehicles in campus.
박상현,신중엽,박계인 경희대학교 부설 식량자원개발연구소 1987 硏究論文集 Vol.8 No.-
This study was to investigate the effects of addition of inorganic salts (KCl, MgCl_(2).6H_(2)O, CaCl_(2), 2H_(2)O) on the change of kimchi components. To this end, kimchi was prepared by adding inorganic salts and fermented at low (6-10℃) and high (20-22℃) temperatures. pH, acidity and pectic substances of kimchi were analyzed. During fermentation, pH, AIS (Alcohol insoluble solid), and HCl soluble pectin (HClSP) were decreased, while acidity and hot water soluble pectin (HWSP) were increased. These changes were more remarkable at high temperature than low temperature. The addition of inorganic salts in kimchi preparation influenced the changes of pH, acidity, HWSP, and HClSP at both low and high temperatures. The changes of pH and acidity were more remarkable in kimchi, prepared with addition of MgCl_(2) .6H_(2)O or CaCl_(2) .2H_(2)O than KCl. The changes of HWSP and HClSP were more marked in kimchi, which was added with KCl than MgCl_(2). 6H_(2)O or CaCl_(2) .2H_(2)O
韓秉基,洪性秀 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-
In this study, the maximum crippling load of thin-walled hatted section tubes as various spot-welded spacing are investigated. The maximum crippling load of thin-walled hatted section tube is analyzed using ANSYS and model is tested under static load. Analysis results are compared with the experimental results.
고사리(Pteridium aquilinum)뿌리 전분의 이화학적 특성에 관한 연구 : 제2보 : 전분의 물리적 특성 Ⅱ. Physical Properties
曺哉銑,金成坤,李啓瑚,權泰完 경희대학교 부설 식량자원개발연구소 1981 硏究論文集 Vol.2 No.-
고사리뿌리 전분의 이화학적인 특성연구의 일환으로 실시된 물리적 특성시험 결과는 다음과 같다. 전분입자의 미구조의 결합력을 보기 위한 흡수도, 팽운력, 용해도 시험결과 감자전분이나 타피오카전분보다 강한 결합을 하고 있으며 곡류전분보다는 약하며 팽윤력이 single-stage pattern을 이루고 있었다. 가열에 의한 전분입자의 복굴절성 상실, α-아밀라아제에 의한 소화성 및 X-선 회절둥으로 전분의 호화과정을 살펴본 결과 55-60℃에서 호화가 시작되고 60~70℃에서는 95%이상 호화되었다. 또한 3~6%전분용액의 가열에 따른 점도변화를 amyl-ograph를 사용하여 실험한 결과 pasting temperature 62~68℃, 최고점도 80~840BU, 50℃로 냉각후의 점도는 110~555BU였다. 따라서 다른 전분에 비해서 점도가 낮으나 setback이 현저히 느렸다. 수분함량 50%의 전분겔의 경도는 팥 전분보다는 약하고 감자나 밀전분에 비해서는 현저히 높았다. 전분겔의 저장중 노화속도는 밀 전분보다는 느리고 파지오카 전분보다는 빨랐다. 고사리뿌리 전분은 팥 전분겔특성에 큰 변화를 주지않지만 노화를 억제하였고 밀 전분겔에 첨가시에는 겔의 경도가 저하되어 부드러워지는 경향을 보였다. The gelatinization phenomena of bracken root starch were examined by means of the loss of birefringence, degree of digestibility by amylase and X-ray diffraction. These results indicated that gelatinization temperature of the starch was 55∼60℃ and over 95% of starch were gelatinized at the temperature between 60 and 70℃. The swelling power of the bracken root starch was much less steeper than that of potato or tapioca starch. Amylograph data on the various starch concentrations showed the pasting temperature of 62∼68℃, peak height of 80∼840 Brabender unit (BU) and peak after cooling to 50℃ of 110∼555 BU. According to the information obtained from amylograph data, the bracken root starch showed low set back. The rate of retrogradation of the starch as tested by Texturometer was slower and faster than potato and tapioca starches, respectively.