5Fe_2O_3ㆍ4Al_2O_3ㆍCuO系의 結晶學的 및 Mossbauer 分光學的 硏究

韓天玉 건국대학교 교육대학원 1990 敎育論叢 Vol.13 No.-

The oxide system 5Fe_2O_3 · 4Al_2O_3 · CuO has been studied by means of X-ray diffractometry and Mo¨ssbauer spectroscopy. From the results of X-ray diffraction analgis we found that this system has a cubic spinel-like structure with the lattice parameter a=8.329A˚. The Mo¨ssbauer spectrum of this sample at room temperature suggest the existence of three hyperfine fields, one due to the Fe^3+ on A-sites and the others due to the Fe^3+ and Fe^2+ on B-sites. The Neel temperature is measured to be 885K. The temperature dependence of the Mo¨ssbauer parameters and N??el temperature are discussed in connection with the structure and bonding states. With the help of the relative intensities of the A-sites and B-sites we were able to make cation distribution equation, which supports the facts that Fe^2+ ions have to exist.

線量計로서의 Polyvinyle-Chloride Film

李春鎬,金正弘 全北大學校 1972 論文集 Vol.14 No.-

Use of the polyvinyle-chloride (P.V.C) film for the γ-ray radiation dosimetry has been studied, amploying BNL shipbor irradiator (25,000 Ci) which Korean Radiation Agricultural Institute keeps, We have measured the optical density components of the radiation-induced coloration of 100μ commercial P.V.C film. The results of these measurements show that the transient components of optical density depends upon the annealing temperature. In this experiment, we found that the values of the optical density are independent of the irradiation dose rate between 266 and 341 rad/sec. The plots of the optical density with respect to the irradiation dose show that the curves between 1 and 6 Mrad are linear, however, the curve between 6 and 7 Mrad is not linear. From this study, we conclude that we can use polyvinyle chloride film as a dosimeter within the dose range from 1 Mrad to 30 Mrad.

中小企業 系列化 促進에 관한 分析的 硏究

金千石 단국대학교 경영대학원 1984 經院論叢(壇國大學校) Vol.4 No.-

坊內排水의 中和處理施設에 關한 設計

李春澤,朱錫福,黃基燁 漢陽大學校環境科學硏究所 1987 環境科學論文集 Vol.8 No.-

石炭鑛 坊內 및 廢石場으로부터 流水되어 지고 있는 酸性化된 排水는 오늘날 우리나라에서 石炭産業汚染源中 가장 深刻한 것중에 하나로 되어가고 있다. 이 報告書는 槪括的인 重要裝備內譯과 이에 따른 規格, 容量 및 價格査定을 어림할 수 있는 資料들을 提供하고, 따라서 酸性坊內排水의 處理施設을 計劃 設計하는데 있어서 많은 도움이 될 수 있을 것이다. Acid mine drainage from underground coal mines and coal refusc piles is one of the most persistant coal industrial pollution problems in our country nowadays. This report includes the main equipment specifications and costs of the plant. Therefore, the data obtained in this investigation will be useful for planning and designing the acid mine drainage treatment plant.

三軸試驗에서 k_0壓密을 李用한 壓密係數 算定에 관한 實驗的 硏究

이춘식,이원택 호남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.9 No.-

삼축압축시험기를 이용하는 압밀비배수시험(CU-Test) 혹은 압밀배수시험(CD-Test)을 할 경우에 압밀과정을 거쳐야 된다. 만약 압밀을 k0조건에서 실시하면 현장과 가장 근접한, 표준압밀시험과 동일한 조건을 얻을 수 있다. k0압밀에서 얻은 결과를 이용하여 압밀계수를 구하면 압밀시험을 실시하지 않아도 압밀계수를 예측할 수 있을 것이다. 따라서 본 연구에서는 표준압밀시험을 실시하여 압밀계수를 구하였으며, 또한 삼축압축시험기를 이용한 k0압밀 결과로부터 압밀계수를 구하였다. 본 연구에서는 k0압밀을 통하여 계산된 압밀계수와 일반적으로 압밀계수 산정에 널리 이용되는 몇 가지 방법에 의해 계산된 압밀계수를 비교 검토하였다. CU-test or CD-test using triaxial compression testing system needs consolidation process. If consolidation process is carried out in the condition of k0, the most same condition to that of field and standard consolidation test can be made. If the coefficient of consolidation is obtained by k0 consolidation process in triaxial test, the coefficient of consolidation can be predicted without consolidation test. Therefore in this study, standard consolidation tests are performed to get the coefficient of consolidation. Also the coefficients of consolidation obtained by the k0 condition using triaxial compression testing system and that of several generalized methods are compared.

기계적 안검하수를 동반한 녹색종 1예

주천기,김기봉,박민형 대한의학협회 1990 대한의학협회지 Vol.33 No.10

X-ray Film의 潛像退行

李春鎬,金正弘 全北大學校 1972 論文集 Vol.14 No.-

Using the X-ray films (Dupont type OO, Gafster Finex Ⅱ and Fuji JX) and X-ray appratus installed in our laboratory, we have investingated the rate of the fading of the latent image formed by the X-ray under the varied conditions of the temperature, humidity and the lapse of time. Our investingation shows that the rate of fading depends upon the humidity and the lapse of time. The temperature dependence of fading rate is within the range of error. The linear relationship between the photographic density and the lapse of time is obtained from our experiments.

連體用法「似た」形について : その發生と用法を中心に

柳椿姬 단국대학교 단국일본연구학회 2000 일본의언어와문학 Vol.7 No.-

忠南 西海岸地域 降水 中 水溶性 이온 成分의 變化特性

정진도,이천호 한국환경과학회 2003 한국환경과학회지 Vol.12 No.12

This study was compared each ingredient's local/seasonal change characteristics by analyzing anions and cations, watersoluble ionic components, from the precipitation of Dangjin and Anmyeon-do areas. The samples were collected for 8 months from both spots between the period of April 1, 2002 to November 31, 2002. The precipitation samples were collected continuously through the entire duration of precipitation by using the wet-only automatic samplers. When rain continues to fall over 24 hours or occasionally, we considered those collected from 9 o'clock in the morning for 24 hours as the day's samples. As a method to verify for the reliability of the analyzed data is concerned, we use the ion balance method and the electricity conductance method, was used widely as a way of watching the atmosphere by the WMO (World Meteorological Organization)/GAW (Global Atmosphere Watch). Also, Dangjin and Anmyun-do area confirmed that contains artificial pollutants by analysis of ion concentration data.

고등학생의 여가활동 참여와 사회성 발달에 관한 연구

현승권,고천호 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study was to investigate the relationships between participation in leisure activities and social development, that is, participation in leisure activities related to personal characters and the relationships between participation in leisure activities and social development. TO accomplish the purpose of this study, research models and hypotheses were established based on previous studies and theories. Gender and grade as personal characters, participation in leisure activities as a independent variable and social development as a dependent variable were selected. Total of 570 student who go to High school in kyeon GI-do, moon-san 2004 were selected as subjects with random sampling. The questionnaire used in this study was based on the material which was made by Chung bung-Mo(1971) and was standardized by Han Tae-Ryoung(1998) Frequency analysis, cross analysis, ANOVA and t-test were used in this study and each hypothesis was tested at the significance level of .05. On the basis of the results analyzed, the Conclusion were drawn as follows ; First, there was a difference of participation in leisure activities depending on gender of High school students, but no difference was found depending on grades Second, there was a significant difference of social development in emotional stability, dominance and self-regulation according to types of participation in leisure activities of High school students. Third, No significant difference of social development was found in both frequency and period according to an extent of participation in leisure activities of High school students. Fourth, there was a difference in only activities depending on existence of a leader and there was significant difference in activity and sociability depending on existence of a colleague.