三槐齋와 周邊 立石에 關한 硏究

安啓福 대구효성가톨릭대학교 1995 연구논문집 Vol.51 No.1

Sam-Gye-Je('Sam' means as three, 'Gye' as chinese scholar tree, and 'Je' as a house for a sacrificial rite), located in Tae-Chung-Dong, Kyungsan City, Kyungbuk, is a traditional landscape element that contains features of Je and menhir together. The object of this study is to identify a background of constriction and to analyze meanings and charateristics of the structure. To achieve these objectives, this study has conducted a literature review, an analysis of Gimun(a description of history, landscape or meaning about Je) and photograph, and a level survey. Conclusions derived from these analyses are as follows : 1. About 250 years ago, Chung-Tae-Woon who lived in Taegu, came to the Chung-Dong. He built Sam-Gye-Je where three chinese scholar trees(Sophora japonica L.) stood, followed by Jung-Lya-Goak(a monumental house of dutiful son) in 1855. It is postulated that there were three menhirs when the Sam-Gye-Je was built. 2. It is postulated that the menhir Ⅰ, Ⅲ, Ⅴ were built in Silla Dynasty or before, but it is difficult to conclude that they were built at the same time. It is because that some variations are found in the shape, the weathering state, and kind of the rock. 3. It is postulated that the Menhir Ⅱ and Ⅳ were built in 1855, it is believed that the statues were built to inherit the ancestors' high aim and life(loyalty and filial piety) to their decedants. 4. It is hard to conclude that incisions on the menhir were concurrent. However, contents of the incisions have a strong connection with the meaning of the Je, particularly in the V-menhir. Also menhir Ⅰ and Ⅴ reflected a meaning of elegance, considering the surrounding landform. 5. It is very unique to build the menhir at the Je. Furthermore, it is very interesting to arrange 5 menhirs in one line, even though they were not built at the same time. 6. The origin of the menhir and other details that is not disclosed in this study should be followed by a further research.

유체로 연성된 직사각평판의 거리 변화에 따른 고유진동 해석

유계형,이명규,권대규,이성철 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-

This study dealt with the experimental modal analysis of the perforated rectangular plate coupled with fluid. The natural frequencies of the perforated plate and solid plate in air were obtained by the analytical method based on the relation between the reference kinetic and maximum potential energy and compared with the experimental results. Good agreement between the results was found for the natural frequencies of the perforated plate in air. It was empirically found the natural frequencies of the perforated plate coupled with fluid. The transverse vibration modes, in-phase and out-of-phase, were observed alternately in the fluid-coupled system. Additionally, the effect of distance between perforated plate and solid plate on the fluid-coupled natural frequency was investigated.

國産 카올린의 吸着性에 관한 연구 (II) 粉體學的 考察

李啓胄 충남대학교 약학대학 의약품개발연구소 1985 藥學論文集 Vol.1 No.-

As a part of the studies on adsorptive properties of Korean halloysite clays, Hadong white clays of premium grade were examined for geometric pore structure by mercury porosimetry and for specific surface areas by nitrogen adsorption according to the BET procedure. Three size fractions of the native clay sample were derived from passage BS #100, #200 and #325 meshes, respectively. Several parameters thus observed in relation to the pore structures are shown below: 1. The size fraction of BS #100, #200 and #325 show internal pore volumes of 25.3, 30.2 and 35.0㎡g^-1, respectively. 2. In the distribution curves of the cumulative pore volume against pore diameter, it has been shown that the particle sized, the steeper the distribution over the larger ranges of pore diameters. The converse is true the smaller particles. 3. Internal pore areas increase with decrease in pore sized. It follows that the pores having diameters of ≤ 0. ㎛ are responsible for more than 90% of the total pore area. 4. The behaviour of nitrogen adsorption can be best described by BET type Ⅳ isotherm. Further, the hysteresis loops of the adsorption-desorption curves become narrower with decreasing particle sized. 5. The specific surface areas observed for the fractions of BS #100, BS #200 and BS #325 are 34.6, 35.4 and 43.2 ㎡g^-1, respectively. and the calcined clay of BS #325 has a specific surface area near 30.4㎡g^-1.

비스마스(Bi)의 화학적 분석 (II)

李啓胄,柳柄泰 충남대학교 약학대학 의약품개발연구소 1986 藥學論文集 Vol.2 No.-

초음파 수침법을 이용한 터빈베어링 Babbitt 금속 박리 검사 기술

정계조,박상기,조용상,박병철,길두송 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.4

이 연구는 터빈베어링의 신뢰성을 평가하기 위하여 초음파 C-Scan 방법을 적용한 기술이다. 수침법에 관한 연구는 실험실과 현장검사 적용에 광범위하게 사용되는 기술이다. 여기에서는 C-Scan 방법을 이용하여 베어링의 모재와 Babbitt 금속간 경계부의 상태를 평가하였다. 수침법 C-Scan 방법에 의한 초음파 영상은 베어링 경계부의 상태를 확인하는데 효과적인 방법으로 사용될 수 있었다. 초음파 영상의 분해능을 높이기 위하여 집속형 탐촉지를 사용하고, Babbitt 금속과 베어링 모재간의 접합경계면에서 발생하는 초음파 음압 반사율을 측정하여 결함의 검출과 면적을 추정할 수 있었다. 초음파 수침법은 베어링 접합부의 박리위치와 박리면적의 경계면을 결정하여 크기를 계산하는데 아주 유용하게 사용될 수 있는 기술이며, 이 연구에서 개발된 기술은 화력발전소에서 사용되고 있는 터빈베어링의 건전성을 확보하는데 적용되었다. This study is aimed for the implementation of ultrasonic method to assess the reliability of turbine bearings. A modified ultrasonic immersion technique was carried out in both laboratory experiment and field application. From the laboratory results, we confirmed that the condition of interface layer between the babbitt and base metal be monitored by the C-Scan. The C-Scan image by the ultrasonic immersion test can be used successfully to observe the condition of interface layer. The testing with a focused transducer provides a promising approach for estimating the extent of the damaged region and observing the interface layer effectively. The difference of the ultrasonic reflection ratio between the bonding and debonding area at the interface layer is one of the key parameters for assessing the extent of the damaged area; additionally, the reflection amplitude exhibits a favorable correlation with the overall damage level. The technique developed in this study was applied to the inspection of the turbine bearings at several power plants in Korea whereby the applicability in the filed can be ascertained.

전기도금한 교정용 스테인레스스틸 선재의 세포독성에 관한 연구

이계형,조진형,이기헌,황현식 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.2

본 연구는 전기도금을 이용하여 교정용 스테인레스스틸 선재의 직경을 증가시킨 후 세포독성을 알아봄으로써 이의 임상적 적용 가능성을 알아보고자 시행되었다. 시판되고있는 교정용 스테인레스스틸 선재에 전기도금 방법을 이용하여 니켈을 도금한 후, 이를 도금하지 않은 교정용 스테인레스스틸 선재 그리고 티타늄 또는 구리와 비교하기 위하여 이들을 배지에 넣고 72시간 배양하였다. 이 배양액을 금속 유리량 측정을 위해 ICP-AES(inductively coupled plasma atomic emission spectrophotometer) 분석을 시행한 결과 전기도금한 선재에서 많은 양의 니켈 이온이 유리되었으며, 구리에서는 많은 양의 구리 이온이 유리되었다. Microplate에 Balb/c 3T3 mouse fibroblast를 넣고 각 선재를 배양한 배양액을 75%, 50%, 25%로희석시켜 첨가한 후 MTT (3-[4.5-dimethylthiazol-2yl]-2.5-diphenyl tetrazolium bromide)분석을 시행하여 이를 배지만을 첨가한 경우와 흡광도를 비교하였다. 티타늄은 모든 농도에서 배지만을 첨가한 경우에 비해 흡광도 차이를 보이지 않았지만전기도금한 선재(p<0.001), 스테인레스스틸선재(p<0.05), 구리(p<0.001)는 배지만을 첨가한 경우보다 통계적으로 유의한 흡광도 감소를 보였다. ISO 10993, part5에 따라 구리는 "강한 독성"을 보이는 반면 티타늄과 스테인레스스틸 선재는 "무독성", 그리고 전기도금 선재는 "중등도 독성"으로 나타났다. 이상의 결과는 전기도금을 이용하여 교정용 선재의 직경을 증가시키는 방법이 임상에 적용되기 위해서는 세포독성을 줄이기 위한 추가의 연구가 필요함을 시사하였다. The purpose of this study was to examine the cytotoxicity of orthodontic wire which had an increased diameter through electroplating, and to evaluate its possoble clinical applications. First nickel plating was carried out on the commercially available stainless steel wire using an electroplating technique. For the comparison of the electroplated wire with ready made stainless steelwire and titanium or copper, each wire was incybated for 72 hours in a medium. The release of the metal ion was measured using ICP-AES(Inductively Coupled Plasma Atomic Emission Spectrophotometer). Balb/c 3T3 mouse fibroblast was put on a microplate and placed in an incubated medium of 75%, 50%, and 20% dilation. An MTT analysis was used to compare with the medium only. The changein absorbency value of each wire group and the difference of absorbency value according to the change of dilution was measured. The results of ICP-AES analysis showed that great amount nickel ion was isolated from electrpolated orthodontic wires and great amount copper ion was isolated from copper.The results of the MTT analysis showed that there was no difference in the absorbency value of titanium at any dilution. However the electroplated wires(p<0.001), the stainless steel wires(p<0.05) and the copper(p<0.001) were statistically significantly lower than those of medium only at all dilutions. Assessment as per ISO 10993, part5, showed that electroplated wire was alloted to "moderate cytotoxic", the titanium and stainless steel wire were "non-cytotoxic". The results of this study indicate that the electroplated or thodontic wires need additional efforts to dectease cytotoxicity for their clinical applications.

北韓의 外國投資企業 및 外國人에 대한 所得課稅 硏究

李啓滿 조선대학교 통일문제연구소 2001 統一 問題 硏究 Vol.14 No.-

e-supply chain management system 구축 전략의 실행방안에 관한 연구 : 제조업을 중심으로

김계수 한국품질경영학회 2003 품질경영학회지 Vol.31 No.2

The objective in this paper is to develope the e-Supply Chain Management System and applied for the Manufacturing. A Manufacturing that is consider to be world class recognize that its ability to complete in the marketplace depends on developing e-SCM System that is properly align with its mission of serving the customer. This paper investigated the relationship between e-SCM and performance in manufacturing. A stratified random sample was collected from the Federation of Korea Industries. Conclusively, e-SCM is important factor between source factors (environmental dynamic, Leadership) and manufacturing performance. e-SCM is significantly related to Quality, Flexibility, Delivery, and Cost.

Radiation Shear Stress에 의한 沿岸流 流速分布 特性에 관한 解析(2) : 水評混合應力을 考慮한 경우

咸契運 慶尙大學校 1984 論文集 Vol.23 No.2

1. 孤立波理論을 適用한 碎波帶內에서의 沿岸流流動分布는 포물선 分布임이 確認되었다. 2. 沿岸流 流動의 變化에 支配的인 因子는 底面摩擦임이 確認되었다. 3. 本人의 沿岸流流動分布曲線의 理論値가 徵小振幅波 適用時의 값보다 다소 큰 값을 보이고 있다. 앞으로 亂類에서의 Reynold 應力을 고려한 沿岸流流速의 變化도 계속 究明하고자 한다. In this paper, author intented to discuss the Longshorecurrents characteristics in the breakzone with the Radiation Shear Stress concept in the consideration with the effect for the Lateral Mixing Friction (Lx). And author calculated longshore-current velocity variation according to wave condition. Discussed and calculated results are as follows ; 1. The longshore-currents distribution are parabola from breaking point to shoreline by solitary wave theory. 2. Maximum velocity point exist in breakzone. 3. The bottom friction is the most factor affecting the velocity of Longshore-Currents.

실업고등학교와의 교육과정 연계운영이 전문대 입시경쟁력에 미칠 영향에 관한 연구

崔桂浩,徐東薰 대구산업정보대학 1998 논문집 Vol.12 No.1

Educational courses at a vocational high school in connection with a junior college, effective on February 9, 1996 under the second educational reform bill, has been analysed to have great influence on junior college entrance examination competition. 1. This is shown from the analysis of target school's educational progress in connection with junior college courses and investigation into its current situation. According to the results, 4 model junior colleges and 79 curriculums at 13 self-regulated junior colleges expressed to take part in it. And 77 curriculums at 52 vocational high schools also built up a closer connection with it. The number of students, whom junior college will admit through a preferential selection test, amount to 2227. 2. According to a poll investigation, only 29.6% of vocational high school students answered they went there because of academic records. Among them, no more than 46.6% talked of school satisfaction. As for the educational courses linked with a junior college, 85.6% replyed they felt it is necessary. Only 4.5% felt it unnecessary. 95.5% of school personnel, who are working with a vocational high school or a junior college put emphasis on its necessity. 80.2% of them also answered that educational courses linking a vocational high school with a junior college would exert a great influence on a vocational high school. In conclusion, the educational at a vocational high school in connection with a junior college will exercise great influence on junior college entrance examiantion competition.