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宮城縣における災害廢棄物の現狀と適正處理 およびリサイクルに向けた課題について
( Saito Yuko ) 동서대학교 일본연구센터 2012 次世代 人文社會硏究 Vol.8 No.-
Great East Japan Earthquake is said to be the most disastrous one on record. How to handle waste from the disaster varies to a large extent among local governments as each of them is in its own circumstances differently from others. The Japanese government enforced the special measure law to clarify the roles of itself but there are many problems to cope with in processing and recycling the waste from the disaster in these local government areas properly based on such law in the same, smooth and speedy way. This paper, based on the waste handling policy, reports on the current actual conditions of waste from the earthquake disaster this time and indicates problems to be tackled by the local administration for the most appropriate handling and recycling in Miyagi Prefecture.
The Case Study of Project-Based Learning in Information Study
Yuko Saito 한양대학교 교육공학연구소 2010 학습과학연구 Vol.4 No.1
In Japan, "Information Study" has been introduced as a part of curriculum in high school since 2003. It is important for student to have positive attitude toward participation in the information society. One of teaching ways to come over the objective of“ Information Study” is Project-Based Learning (PBL). This study examines if PBL covers the contents in “ Information Study C” in which students have to study based on the case study of ITAMI high school.
A Study of Practices Based on Project-Based Learning (PBL) for Society and Information Courses
Yuko Saito 한양대학교 교육공학연구소 2011 학습과학연구 Vol.5 No.1
MEXT will change the course of study for high schools in 2013. In the new course of study, the “Information A” course is eliminated, the “Information B” course is renamed to “Science of Information”, and the “Information C” course becomes “Society and Information”. The purpose of this study is to examine if PBL covers the objective contents in the curriculum of "Society and Information" based on the case study of how the course is taught at Itami High School in Hyogo Prefecture, Japan.
Issues Derived from Urban Mining Policy: Case Study on Automobile Electrical Components
( Jeongsoo Yu ),( Yuko Saito ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Through the years, urban mining policy, as a means to collect valuable metals, has attracted attention. In order to spread more the concept of urban mining spread in society today, extensive and effective publicity activities are needed. At the same time, it is necessary to establish a social structure that enables interested parties to mutually collaborate. In this study, we focused on automobile electrical components in urban mining in consideration of the fact that it is easier to collect the same quality items by larger volumes than the used small-sized home appliances. Then, a comparative analysis was done in two case where the recycling company does both collection and disassembly and another one where handicapped workers do precise disassembly. By evaluating the economic efficiency of these two cases, we investigated the effectiveness of collaboration between the recycling system and social welfare institutions.
Brown Fat as a Regulator of Systemic Metabolism beyond Thermogenesis
Okamatsu-Ogura Yuko,Masayuki Saito 대한당뇨병학회 2021 Diabetes and Metabolism Journal Vol.45 No.6
Brown adipose tissue (BAT) is a specialized tissue for nonshivering thermogenesis to dissipate energy as heat. Although BAT research has long been limited mostly in small rodents, the rediscovery of metabolically active BAT in adult humans has dramatically promoted the translational studies on BAT in health and diseases. Moreover, several remarkable advancements have been made in brown fat biology over the past decade: The molecular and functional analyses of inducible thermogenic adipocytes (socalled beige adipocytes) arising from a developmentally different lineage from classical brown adipocytes have been accelerated. In addition to a well-established thermogenic activity of uncoupling protein 1 (UCP1), several alternative thermogenic mechanisms have been discovered, particularly in beige adipocytes. It has become clear that BAT influences other peripheral tissues and controls their functions and systemic homeostasis of energy and metabolic substrates, suggesting BAT as a metabolic regulator, other than for thermogenesis. This notion is supported by discovering that various paracrine and endocrine factors are secreted from BAT. We review the current understanding of BAT pathophysiology, particularly focusing on its role as a metabolic regulator in small rodents and also in humans.
Influences of hard- and soft- segment ratios on pyrolysis behavior of polyurethane elastomers
( Yuya Nishiyama ),( Shogo Kumagai ),( Tomohito Kameda ),( Yuko Saito ),( Atsushi Watanabe ),( Suguru Motokucho ),( Hisayuki Nakatani ),( Toshiaki Yoshioka ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Introduction Polyurethane elastomers (PUEs) are typical block copolymers which are composed of alternative hard segment (HS) and soft segment (SS), with the physical and chemical properties of them can be varied by changing HS and SS ratios. Pyrolysis is a promising method for polymeric wastes recycling because it can convert various polymers into chemical feedstock only by heat1). In this study, seven kinds of PUEs with different HS and SS ratios were synthesized (Fig. 1), then influences of hard- and soft-segment ratios on pyrolysis behavior were investigated. Methods, Results and discussion 1. Identification of pyrolysis products: Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was employed to characterize the pyrolysis products under elevated temperature shown in Fig. 2. All the PUEs produced MDI, MAI and MDA (Fig. 3) from HS through pyrolysis, which were formed by pyrolytic urethane bond cleavage via 4-membered and 6-membered transition states shown in Scheme1. 2. In-situ monitoring of ticpyrolysis products: In-situ monitoring of pyrolysis products, called evolved gas analysis-MS (EGA-MS), was performed under the same pyrolysis conditions as the previous section. EGA chromatogram and representative products are shown in Fig. 4. Pyrolysis of various PUEs with different HS and SS clearly showed presence of three pyrolysis zones. In the zone 1, HS decomposition products such as CO<sub>2</sub>, butanediol (BD) and MDI are generated from five PUEs having HS. This suggested that formation of isocyanate end shown in Scheme1-I was dominant at this temperature. In the zone 2, SS-derived products and CO<sub>2</sub> were mainly formed from the five PUEs with low HS ratios. MDI was not produced in this zone, while MAI and MDA were produced. These results revealed that the high temperature promoted formation of the amine end shown in Scheme1-Ⅱ. In addition, a part of the SS-derived product could be generated by decomposition of MDI between HS and SS. In the zone 3, SS-derived products were produced from all PUEs, and the SS decomposition was continued. Thus, the temperature-dependent pyrolysis behavior was proposed (Scheme2) based on the findings in this work. Conclusion Temperature-dependent pyrolysis behavior of PUEs with different hard- and soft-segment ratios was investigated through pyrolysis tests employing Py-GC/MS and EGA-MS techniques. The findings in this work will be helpful to control product selectivity and feedstock recovery through pyrolytic approach.