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MAAS, INEKE Institute for Social Development and Policy Resear 1995 Korea Journal of Population and Development Vol.24 No.2
Do characteristics of the marital and migration history of the elderly population of West-Berlin matter for their present resources and societal integration? To answer this question we analyse data from the Berlin Aging Study. We show that for resources in old age, it is important when and under what circumstances women lost their partner. Divorced women and WWII widows are financially worse off than never married women, still married women, and more recent widows, and they also evaluate their health more negatively than others. The migration history seems equally important. Financial resources, social resources, and societal integration in old age depend on characteristics like region of birth and having experienced flight or expulsion. But contrary to the effects of divorce and early widowhood for women, here we could not generally speak of one group of looses.
Machinability Study of Single-Crystal Sapphire in a Ball- End Milling Process
Philipp Maas,민상기,Yuta Mizumoto,Yasuhiro Kakinuma 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.1
Sapphire has received increasing attention as an engineering material even though its machinability is still an issue. In this study, the influence of the milling process parameters on the surface quality of single-crystal sapphire is investigated. Due to the hardness and brittleness of the sapphire substrate, crack initiation becomes the main concern with respect to up- and down-milling, feed rate, tool inclination angle and tool wear. With an inclined ball-end mill cutter in feed direction various cutting tests were performed to find optimal parameters for machining microchannel. It was observed that the feed rate and depth of cut are dominant factors for the surface quality. The tool inclination angle shows a parabolic relation to the quality of the machined surface. After tool wear events, such as peeling-off of the tool coating, an increased surface roughness is observed.
Use of Remotely-Sensed Data in Cotton Growth Model
Ko, Jong-Han,Maas, Stephan J. The Korean Society of Crop Science 2007 한국작물학회지 Vol.52 No.4
Remote sensing data can be integrated into crop models, making simulation improved. A crop model that uses remote sensing data was evaluated for its capability, which was performed through comparing three different methods of canopy measurement for cotton(Gossypium hirsutum L.). The measurement methods used were leaf area index(LAI), hand-held remotely sensed perpendicular vegetation index(PVI), and satellite remotely sensed PVI. Simulated values of cotton growth and lint yield showed reasonable agreement with the corresponding measurements when canopy measurements of LAI and hand-held remotely sensed PVI were used for model calibration. Meanwhile, simulated lint yields involving the satellite remotely sensed PVI were in rough agreement with the measured lint yields. We believe this matter could be improved by using remote sensing data obtained from finer resolution sensors. The model not only has simple input requirements but also is easy to use. It promises to expand its applicability to other regions for crop production, and to be applicable to regional crop growth monitoring and yield mapping projects.
Use of Remotely-Sensed Data in Cotton Growth Model
Jonghan Ko,Stephan J. Maas 韓國作物學會 2007 한국작물학회지 Vol.52 No.4
Remote sensing data can be integrated into crop models, making simulation improved. A crop model that uses remote sensing data was evaluated for its capability, which was performed through comparing three different methods of canopy measurement for cotton(Gossypium hirsutum L.). The measurement methods used were leaf area index(LAI), hand-held remotely sensed perpendicular vegetation index(PVI), and satellite remotely sensed PVI. Simulated values of cotton growth and lint yield showed reasonable agreement with the corresponding measurements when canopy measurements of LAI and hand-held remotely sensed PVI were used for model calibration. Meanwhile, simulated lint yields involving the satellite remotely sensed PVI were in rough agreement with the measured lint yields. We believe this matter could be improved by using remote sensing data obtained from finer resolution sensors. The model not only has simple input requirements but also is easy to use. It promises to expand its applicability to other regions for crop production, and to be applicable to regional crop growth monitoring and yield mapping projects.