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이재덕,이상익,김병일,박용원 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
Crushed Stone Pile(CSP) is suitable for improving soft silts and clays and loose silty sands. The effects of this method are increasing bearing capacity and slope stability, reducing settlement, increasing the time-rate of consolidation, and reducing liquefaction potential. In this study several model tests are carried out to investigate the bearing capacity of CSP treated ground. The results show that bearing capacity increases with the area replacement ratio and the preconsolidation pressure of the ground.
농촌인구이출과 농촌지역의 변화 : 경험적 연구사례의 검토 A Review of Empirical Studies
李在德 西原大學校 1989 西原大學 論文集 Vol.23 No.-
Since 1980, there has been much attention to the rural-urban migration and its impacts on rural areas in geographical studies of Korea. These studies are largely based on field study of small rural areas. This paper is the review of theses empirical studies. The principle motiv of Korean rural outmigration is econimic one such as the deiciency of economic opportunities in rural areas, low and instable agricultural income. In addition, social motiv for education and the joint with the family who are preceding outmigrants. In migration pattern, chain migration is predominant, the selectivity of migration in age, sex and education is prevailing. Satep migration is identified in migration process but f final destinations for migrants are larger cities, especially Seoul Metropolitan Area. Among the change of rural areas ruslulted from rural outmigration there are structural change of agricultural labor forces, farming system,land use pattern.This changes are mainly identified as negative one. Thus it has policy implication and this will be main target for future ntified as negative one. Thus it has policy implication and this will be manin target for future research.
Polyurthane/Polystyrene IPN에서 조성과 중합속도가 미세구조와 물성에 미치는 영향(II) -중합속도가 미세구조와 물성에 미치는 영향-
이재덕,조현태 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.9
The polyurethane/polystyrene interpenetrating polymer network (PU/Ps IPN) was prepared by simultaneous polymerization method. The effects of preparation conditions on the reaction rates of each component, domain size, effective crosslinking density, Tg, mechanical properties were investigated by SAXS, DSC and mechanical analysis. The increase of reaction rate of PU component caused the decrease of Tg of PS component even in the constant composition on PU/PS IPN. This result is considered that the increase of reaction rate of one component changes the matrix phase in IPN to its own phase. The notched impact strength of PU/PS IPN increased with the increase of reaction rate and molecular weight of PU component, but decreased with the increase of reaction rate and crosslinking density of PS component.
淸原郡 農村中心地에 관한 硏究 : 人口와 機能分布를 중심으로
李在德 西原大學校 1985 西原大學 論文集 Vol.15 No.-
This study aims to investigate the population distribution, population change and the distribution of service functions inrural areas and then to seek the factors of present distribution of population and functions. The hypothesis of this study is that the trend of the population change of rural areas in which more functions are located is increasing or stable onewhile overall rural areas experience rapid rural depopulation. To test, this the distribution and change of the population, the distribution of service functions and manufacturing activities, accessibility with central city etc. are analysed by administrative Ri of Ch??ngwon Area. The results of this study can be summarized as follows. 1.Population distribution in rural areas relates to such factors as location of administrative function and arable land etc. Among these, the location of administrative function and accessibility are more important in study area. 2.In the rural areas as a whole, the trend of depopulation dominates, rural service centers experience population increase or population stability at least. Manufacturing plays only limited role in population increase of study area. 3.The distribution pattern of service functions is puntiform around rural administrative center. The number of administrative functions and functions related to agriculture are homogeneous among rural centers. But the number and type of retail functions and service functions are related to the population size of rural centers.