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12% 크롬 로우터 강에서 응고속도와 가공조건이 미세 조직에 미치는 영향
최재영,강석봉,이래성 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.1
The influence of solidification rates on the morphology and distribution of δ-ferrite and eutectic niobium carbides was studied using Bridgman-type unidirectional solidification apparatus in order to simulate the solidification pattern of a large-scale ingot of 12% chromium rotor steel. The volume fractions of the δ ferrite contained in the specimens solidified with the withdrawal speeds of 225 ㎜/hr, 45 ㎜/hr, and 4.5 ㎜/hr were measured to be 7%, 5%, and 30% respectively. δ-ferrite was finely distributed in the case of the withdrawal speeds of 225 ㎜/hr and 45 ㎜/hr, but the distribution was coarse network type in the case of the withdrawal speed of 4.5 ㎜/hr. When hot compressive working was applied in temperatures from 950℃ to 1250℃, 3-ferrite was transformed into carbides and austenite at the interface of δ-ferrite with the matrix. Subsequent heat treat melts result in a complete annihilation of δ-ferrite in the case of fast withdrawal speeds, but result in only a partial annihilation in the ca -e of the slow withdrawal speed, 4.5 ㎜/hr.
골다공증에 의한 압박 골절의 치료에 있어서 경피적 추세 성형술의 의의
최재영,윤승환,조준,문창택,장상근 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Percutaneous vertebroplasty has recently been introduced as a therapeutic alternative for the treatment of pain associated with osteoporotic compression fractures and performed popularly at a few centers by neurosurgeons. This technique allows marked pain relief through stabilization of microfractures and strengthening of weakened vertebral body. Authors retrospectively analyzed the clinical outcome of 100 patients with osteoporotic compression fractures for investigating the therapeutic effectiveness of percutaneous vertebroplasty. They were treated with vertebroplasty from April to August 1999. Plain X-ray of all patients showed osteoporotic compression fractures at more than one level.
최재영 경주대학교 건설환경연구소 1999 建設環境論叢 Vol.- No.1
Our ancestors lived in this land, keeping faith with nature. And our culture is greatly related to the natural environment of our country. But today, old geographical names which have their own history are disappearing in this land because of unbanization and industrialization. Accordingly, it is very meaningful to study the ways of living, the geographical features, the use of trees, and the types of natural landscape object revealed in the orings of the old geographical names, and to exploit the result of this study is as follows: 1. Old geographical names are discovered more in the suburbs of Kyongju City than in the heart of this city. Especially, Yangbuk-meon area in the outskirts of Kyongju City has many old geographical names originating from its natural landscape objects. 2. Of the 557 old geographical names, 100 ones(18%) derived from the trees, the woods, and the plants in the areas concerned. 3. Some old geographical names derived from plants such as Pinus densiflora S. et Z., Prunus armeniaca var. ansu Max., Zizyphus jujuba var. inermis Rehder, Castanea crenata s. et Z, Lespedeza bicolor Turcz, Phyllostachys bambusoides S. et Z, Diospyros kaki Thunb, Celtis sinensis Pers, Paulownia coreana, Actinidia arguta Planch, Sophra japonica L, Quercus acutissima Carruthers, Rhus verniciflua Stokes Marsh, Pyrus pyrifolia Nakai, Ailanthus altissima Swingle, Cydonia sinensis Thouin, Broussonetia Kazinoki Siebold, Prunus armeniaca var. ansu Max
최재영 경주대학교 2002 論文集 Vol.15 No.-
Mt Namsan in the area of Kyongju National Park is known as a spiritual mountain where Buddhist remains of Shilla Kingdom and valuable cultural relics are scattered. And also it was registrated as one of World Preservation Heritages by UNESCO. With a lot of tourists increasing in and out of Korea, its natural environment is getting deteriorated. So the management of Mt Namsan's natural landscape has been studied in order to preserve its natural environment. The results of the study are as follows, 1 The inappropriate trees in Mt Namsan have to be eliminated. 2 The plants that are harmful to the Buddhist remains made of stone have to be removed. 3 The trees have to be planted in the area of Mt Namsan which was devastated by a big fire a few years ago. 4 The plants which do demage to pine trees have to be removed and continue to be managed. 5 The growing environment of pine trees has to be made artificially so that they can grow well. 6 The nature resting year system has to be implemented to restore its original fresh environment. 7 The facilities which disturb fine views of Mt Namsan have to be removed. 8 Damages from disease and harmful insects have to be prevented. 9 The trees which can make Mt Namsan command a fine view have to be planted and the plans for the preservation and management of Mt Namsan be made.
경주의 역사문화도시 이미지 제고를 위한 문화공간·시설의 조성방안에 관한 연구
최재영 경주대학교 지역개발연구소 2000 地域開發論叢 Vol.- No.3
The study aims to offer some proposals. for improvement in the image of Kyongju City, as the amcient Kingdom Silla's Capital and as one of the most gistorical and cultural cities in Korea. This study puts stress on the reformation of the city into a most cultural space. Some proposals can be made as follows: 1. To utilize the Kyongju Cultural Center(former Kyongju National Museum)as a folk museum. 2. To reconstruct the historical site of the commercial business district as a cultural space. 3. To revitalize the culture and arts streets of the city. 4. To build a complex culture and arts center for the city. 5. To set the urban street spaces in good condition. 6. To utilize the urban rivers as cultural spaces. 7. To set the open spaces of the city in good condition. 8. To build a new unigied city hall. 9. To hold culture and ares festivats successfully. 10. To ask for help from the Korean government. When these proposals have been put to practice, kyongju City will be born again as the most historical and cultural city in which the past, the present and the future will coexist, and people can feel the breath of the past of the most brilliant Silla Kingdom.