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EMISSION LINE VELOCITY FIELD OF THE MAGELLANIC IRREGULAR GALAXY NGC 4449
SASAKI MINORU,OHTANI HIROSHI,SAITO MAMORU,OHTA KOUJI,YOSHIDA MICHITOSHI,SHIMIZU TASUHlRO,KOYANO HISASHI,KOSUGI GEORGE,AOKI KENTARO,SASAKI TOSHIYUKI The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
The imaging spectroscopic observations of the Magellanic irregular galaxy NGC 4449 were made to show the detailed kinematic structure of the galaxy. Many filamentary structures and Several bubble-like structures are recognized in a 3D data cube of H$\alpha$ emission line. Velocity field shows the kpc-scale mosaic structure and counter- rotation of ionized gas.
Sasaki, Hiraku,Nonaka, Jun,Otawa, Kenichi,Kitazume, Osamu,Asano, Ryoki,Sasaki, Takako,Nakai, Yutaka Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.1
We investigated the structure of bacterial communities present in livestock manure-based composting processes and evaluated the bacterial succession during the composting processes. Compost samples were derived separately from swine manure, dairy manure and sewage sludge. The structure of the bacterial community was analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) using universal eubacterial primers. The genus Bacillus and related genera were mainly detected following the thermophilic composting phase of swine and dairy manure composts, and the members of the phylum Bacteroidetes were mainly detected in the cattle manure waste-based and sewage sludge compost. We recovered and sequenced limited number of the bands; however, the PCR-DGGE analysis showed that predominant diversities during the composting processes were markedly changed. Although PCR-DGGE analysis revealed the presence of different phyla in the early stages of composting, the members of the phylum Firmicutes and Bacteroidetes were observed to be one of the predominant phyla after the thermophilic phase.
SUMRAY: R and Python Codes for Calculating Cancer Risk Due to Radiation Exposure of a Population
Sasaki Michiya,Furukawa Kyoji,Satoh Daiki,Shimada Kazumasa,Kudo Shin’ichi,Takagi Shunji,Takahara Shogo,Kai Michiaki 대한방사선방어학회 2023 방사선방어학회지 Vol.48 No.2
Background : Quantitative risk assessments should be accompanied by uncertainty analyses of the risk models employed in the calculations . In this study, we aim to develop a computational code named SUMRAY for use in cancer risk projections from radiation exposure taking into ac- count uncertainties . We also aim to make SUMRAY publicly available as a resource for further improvement of risk projection . Materials and Methods : SUMRAY has two versions of code written in R and Python . The risk models used in SUMRAY for all-solid-cancer mortality and incidence were those published in the Life Span Study of a cohort of the atomic bomb survivors in Hiroshima and Nagasaki . The confidence intervals associated with the evaluated risks were derived by propagating the statisti- cal uncertainties in the risk model parameter estimates by the Monte Carlo method . JRPR Results and Discussion : SUMRAY was used to calculate the lifetime or time-integrated attrib- utable risks of cancer under an exposure scenario (baseline rates , dose[s] , age[s] at exposure , age at the end of follow-up, sex) specified by the user. The results were compared with those calculated using another well-known web-based tool , Radiation Risk Assessment Tool (Rad- RAT; National Institutes of Health) , and showed a reasonable agreement within the estimated confidential interval . Compared with RadRAT, SUMRAY can be used for a wide range of ap- plications , as it allows the risk projection with arbitrarily specified risk models and/or popula- tion reference data . Conclusion : The reliabilities of SUMRAY with the present risk-model parameters and their variance-covariance matrices were verified by comparing them with those of the other codes . The SUMRAY code is distributed to the public as an open-source code under the Massachusetts Institute of Technology license .
On the Methodology of Sea Port Cities Studies
SASAKI, Mamoru(사사키 마모루) 한국해양대학교 국제해양문제연구소 2018 해항도시문화교섭학 Vol.0 No.19
본고는 해항도시 연구를 사회학의 관점에서 재고하고 연구방법론에 관한 몇 가지 문제를 검토한 것이다. 첫째, 해항도시의 개념에 관한 것으로, 해항도시를 접촉지대로서 인식하고 연구해야 한다는 점을 도출했다. 둘째, 세계화 시대의 사회문화적 역동성에 관한 사회학 이론으로서 비교연구방법론을 검토했다. 셋째, 중국의 사회학자 페이샤오퉁이 제안한 ‘유형 비교 접근법’을 검토하여 해항도시 연구방법을 재고했다. 이상의 검토를 통해 필자는 해항도시의 연구방법으로서 비교연구방법의 중요성을 강조하고자 한다. 비교연구방법을 통해 다원적 관점에서 연구 결과를 검토할 수 있고, 개별 사례 연구의 다양한 정보를 축적할 수 있으며, 확장된 주제를 바탕으로 보다 심도있고 종합적인 연구를 진행할 수 있을 것이다. In this paper I propose to rethink of the method of Sea Port Cities Studies. For this subject, I examine some issues. The first issue is on the conception of Sea Port Cities as Contact Zone. The second is a discussion of the sociological theory on socio-cultural dynamics of the globalizing era. The third is about the methodology of Sea Port Cities Studies. In conclusion, I point out the importance of the comparative studies method, through that we can review our findings from pluralistic perspective of academic researches and accumulate various information of individual field study for analyzing the subject more deeply. Besides, we can stress our forum has served important roles to bring up young generation"s researchers.
Calculation of an Indicator for Early Death Using Atomic Bomb Survivors’ Data
Sasaki Michiya,Fujimichi Yuki,Yoshida Kazuo,Iwasaki Toshiyasu 대한방사선방어학회 2022 방사선방어학회지 Vol.47 No.1
Background: A comprehensive, traceable, and easy-to-understand radiation risk indicator is desired for radiological protection. The early-onset hypothesis could be used for this purpose.Materials and Methods: An indicator for early death (IED) was developed and calculated using the epidemiological dataset from the 14th Report of the Life Span Study (LSS) of Hiroshima and Nagasaki. By clarifying the calculation process, IED for all-cause mortality was estimated. In addition, the characteristics of IED for solid cancer mortality and cardiovascular mortality as well as those of men and women, and their dependence on age at exposure were investigated for detailed analysis.Results and Discussion: The IED for all-cause mortality was estimated to be approximately 4 years for an acute radiation exposure of 1 Gy regardless of the fitting dose range. The cumulative death rate for all solid cancers also indicated the early-death tendency (approximately 7–10 years at 1 Gy). Although, there is a slight difference in the characteristics of the risk obtained from the LSS study and this study, it is considered that the IED in a unit of years can also be used to show the overall picture of risk due to radiation exposure.Conclusion: We developed and calculated the indicator for early death, IED, for the cumulative mortality rate of all causes of death, all solid cancers, and circulatory diseases. The quantitative values of IED were estimated to be 4 years for all causes of death, 7–10 years for all solid cancers. IED has an advantage for intuitively understanding the meaning of radiation risk since it can be obtained by a simple and traceable method.