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작은 만에서 식물플랑크톤 생체량과 생산력 변화에 대한 외부 물의 정기적인 침입 효과의 모델링
( Hayami Yuichi ),( Shu Ougiyama ),( Tsuneyoshi Koizumi ),( Hidetaka Takeoka ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
Effects of the different strengths and intervals of the periodic outer water intrusions (kyuchos and bottom intrusions) on the dynamics of phytoplankton biomass in a small embayment were examined with a simple numerical model. Environmental conditions of Kitanada Bay in the Bungo Channel were applied to the model. As the interval of the intrusion became longer and the amplitude became smaller, phytoplankton biomass in the bay became higher. On the other hand, as the interval became shorter and the amplitude became larger, the growth rate of the phytoplankton became higher. It suggested that when the intrusion was weaker, water exchange of the bay decreased and the phytoplankton in the bay accumulated at a high density. When water exchange was improved by active intrusions, availability of light would become more efficient and the growth rate of the phytoplankton was enhanced.
Tokugawa Japan : Demographics and Family
( Hayami Akira ) 성균관대학교 동아시아학술원 2004 Sungkyun Journal of East Asian Studies Vol.4 No.2
Two Japanese primary sources, Shuman aratame cho and Ninbechu aratame cho, provide census and familial data for studying the population and family in Tokygawa Japan. As for Shuman aratame cho, it was a product of the strict prohibition of Christianity by the Tokugawa bakufu. In principle, all Japanese individuals were required to get a seal from his/her local Buddhist temple to prove his/her religious identification as a Buddhist not as Christian. The administrative heads of cho (town) and mura (village) were in charge of compiling the document and submitting it to daimyo (feudal lord). The Ninbechu aratame cho, compiled by bakufu officials and local daimyo according to their administrative needs, was a census document of a particular jurisdiction, listing name and age of individual resident like Shuman aratame cho. The historical demographic studies in Japan based on the above two sources have been used for illuminating the reasons for regionally different family patterns. Still, more case studies are needed for further clarify the regional differences in the family pattern. In addition, in answering many unsolved questions about the demographic realities of Tokugawa Japan, historical demographers can be helped with the findings of other related disciplines such as linguistic, geography, and so on.
Measurement of Flow Vorticities Using a Dynamic PIV
Hayami H. 한국가시화정보학회 2006 KOREA-JAPAN Joint Seminar on Particle Image Veloci Vol.- No.-
A dynamic PlV system with 2 ㎑ at mega-pixel frame and up to 10 ㎑ at 512x256 pixels has been developed in success. The combination of a high-speed CMOS camera and a high-speed single-rod Nd:YLF laser materialized the present dynamic PlV system with an in-house timing controller. The dynamic PlV can give the huge amount of data. It can resolve the dynamics of the flow field including vortex motion. The dynamic PlV will be a standard tool for the flow analysis. Measurement of flow vorticity is very important to understand the flow structure. To measure three components of vorticity, a scanning stereoscopic PlV system, a dual-plane stereoscopic PlV system or a Tomo-PlV is available. On the other hand, a stereoscopic dynamic PlV system can provide a highly time-resolved velocity vectors, then if Taylor hypothesis could be applied, two in-plane components of vorticity would be estimated. There will be various fields of applications, such as turbulent flow, transient flow, micro flow, 3D volume flow, and so on, while following procedures should be investigated. To obtain the high' reliability velocity and vorticity vector data, the low-pass filtering technique for spatial and temporal domain should be standardized, including the PlV evaluation algorithm. The advanced technique of comparison between the measured results and computer simulation will be needed. The spatial and temporal frequency analysis would be necessary. The wavelet analysis or advanced POD analysis may be applicable. Furthermore, a higher frame rate, a shorter camera dead?time, a higher speed data transfer system, a higher speed processing system against a huge data, and so on, would be highly expected.