研究者業績
基本情報
経歴
6-
2023年4月 - 現在
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2021年4月 - 2023年3月
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2017年4月 - 2023年3月
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2013年4月 - 2017年3月
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2013年4月 - 2017年3月
学歴
3-
2007年10月 - 2010年9月
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1986年4月 - 1988年3月
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1982年4月 - 1986年3月
委員歴
14-
2023年4月 - 現在
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2021年4月 - 現在
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2021年4月 - 現在
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2019年6月 - 現在
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2017年4月 - 現在
受賞
3-
2003年10月
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2002年10月
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2000年10月
論文
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廃棄物資源循環学会研究発表会講演集 26 169-169 2015年電子基板には貴重な資源が含まれており、リサイクルの高度化のためには、微量な含有資源量の把握が必要である。そこで、筆者らは、資源量を簡便に推定する方法として、電子基板に搭載されている部品の含有資源量データベースを作成し、対象とする部品の搭載数と含有資源量から、基板全体の含有資源量を推定する方法を検討している。今回、将来的にプロセスの自動化が可能な画像処理技術を用いた電子基板の検出・識別技術について、経済性が高い金を高濃度で含むICを事例として検討したので報告する。まず、画像処理技術を電子基板上の部品検出に適用するためにアルゴリズムを検討した結果、IC特有の特徴(色、形状等)から、基板上でICを高精度に検出できる方法を見出した。さらに、含有資源量データベースと参照するため、複数の識別方法を検討した結果、未知のICであっても比較的特徴の近いICのグループに分類可能な方法を確立した。
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NTT Technical Review 13(3) 1-6 2015年 査読有り
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SOLID STATE IONICS 262 216-219 2014年9月 査読有りPrussian blue, KxFey[Fe(CN)(6)](z)/nH(2)O, was investigated as a positive electrode material for sodium-ion batteries. A Na cell with a Prussian blue positive electrode exhibited a first discharge capacity of 57 mAh/g. However, the discharge capacity rapidly decreased. It appears that the lattice parameter of Prussian blue changes and electron conductivity is gradually lost. Then, we attempted to improve the cycle performance of the cell with a positive electrode using high conductivity carbon, ketjen black EC600JD. As a result, a positive electrode of Prussian blue and ketjen black exhibited a first discharge capacity of 67 mAh/g and exhibited a retention of more than 80% at the 40th cycle. Moreover, the positive electrode was improved owing to dehydration caused by the thermal treatment of the Prussian blue. Prussian blue showed a reversible Na+ intercalation potential around 2.5 V vs. Na, which corresponds to the redox of Fe2+/Fe3+. (C) 2014 Elsevier B.V. All rights reserved.
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電子情報通信学会技術研究報告 113(444(EE2013 48-58)) 1-6 2014年2月20日リチウムイオン電池に代わる高エネルギー密度電池として資源が豊富なナトリウムを用い,電池の低価格化が期待できるナトリウムイオン電池が注目されている.本研究では,ナトリウムイオン電池用正極材料として,資源性を考慮し,レアメタルフリー材料であるプルシアンブルー(Fe_4[Fe(CN)_6]_3)に着目した.プルシアンブルーは,リチウムのインターカレーション反応が報告されている.また近年では,プルシアンブルー骨格を有する類似体がナトリウムイオン電池の正極材料として検討されている.本研究では,プルシアンブルーの電気化学特性を評価し,さらに,導電助剤の最適化やプルシアンブルーの熱処理により正極の電子伝導性を向上させることで,サイクル特性等の電池特性の改善を図った.
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American Journal of Applied Chemistry 2(5) 74-79 2014年 査読有り
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JOURNAL OF POWER SOURCES 244 17-22 2013年12月 査読有りThe electrochemical properties of lithium air batteries incorporating air electrodes loaded with MnOx, which had different Mn valences as the electrocatalysts were examined in an organic electrolyte solution consisting of 1 mol l(-1) lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)/propylene carbonate (PC). Furthermore, we attempted to improve the battery performance by substituting the Mn site in MnOx with Fe, Ni, or Co. The batteries using Mn2-xFexO3 showed rather large 1st discharge capacities of 230 mAh g(-1) at a current density of 0.25 mA cm(-2) in a dry air atmosphere. The discharge and charge overpotentials were both greatly reduced by loading Mn2-xFexO3 catalysts. However, almost all of these oxides exhibited poor cycle performance. Of the oxides that we examined, Mn1.8Fe0.2O3 had comparatively stable cycle characteristics with a capacity loss of only 25% after 10 cycles. Published by Elsevier B.V.
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RESOURCES CONSERVATION AND RECYCLING 55(2) 196-200 2010年12月Nighttime light observation data are considered an economic indicator because of their strong correlation with such aspects of human activity as population, gross domestic product (GDP) and electricity consumption. We are developing an in-use stock analysis method that uses nighttime light observation data. In this study, we developed new sets of data for 1999, 2000, 2003 and 2006 with which to analyze temporal changes. The relationship between the in-use stock of copper and the net amount of nighttime light were correlated. The result shows that this analysis method can be used for evaluating the in-use stock in an area where statistical data are incomplete. We used the approach to estimate the in-use stocks of copper in Asian countries. (C) 2010 Elsevier B.V. All rights reserved.
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日本金屬學會誌 73(9) 747-751 2009年9月Mobile phones contain many useful metals, such as gold, silver, copper and tungsten, etc. The contained metals in each mobile phone are relatively little, however, the total number of mobile phones used in Japan has become very large. Therefore, mobile phones are paid attention as a stock-in-use of various metals. In contrast, these metals have not been well recycled because of low collecting rate of end-of-life mobile phones. Moreover, the lifecycle of the mobile phone is very short because they have been changed many times for offering new functions, such as cameras, electronic organizers, music players, and televisions. So many materials are considered to be added to obtain these multi functions, and the compositions of materials in mobile phones have changed. In this paper, we collected more than two hundred used mobile phones made between 1996 and 2008 and dismantled them to analyze their metal content. Concentrations of more than 20 metals in mobile phones were measured. It was found that their net amounts of these metals increased year by year. However, the tendency was different for each element. For example, the copper content increases as the number of the functions of a mobile phone was increased. Lead was mostly used as solder and its content decreased. This can be explained with the influence of the environmental regulations. To improve the recycling of mobile phones, the useful data base that including environmental and economic information is essential. Therefore, we also investigated CO<sub>2</sub> emissions and the economic effects of mobile phones based on the results of elemental analyses. CO<sub>2</sub> emissions generated by the incineration of plastics were estimated to be nearly equal to the avoided CO<sub>2</sub> emissions by recovering the metals. The economic impact assessment result showed that the manpower cost exceeds the recovered cost of metals. Therefore it is suggested that the eco-design for recycling is needed.<br>
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日本金屬學會誌 73(9) 713-719 2009年9月Recently, metal demands in the world, especially, in developing countries have rapidly risen. The recovery of metal scrap for recycling contributes to the conservation of natural resources and the construction of a sound material cycle society. A dynamic material (substance) flow analysis is a useful tool to estimate in-use stock of materials for investigating the potentials of metal scrap recovery in designated areas. However, it is a challenging task to estimate the in-use stock of materials, especially in developing countries, because of lack of data. There are two approaches, a top-down approach and a bottom-up approach, for estimating the in-use stock of materials. Top-down approach uses time-series data of consumption and trade of materials and products' life time distributions, whereas bottom-up approach uses the numbers of product units in the designated area and its material use intensities. In this paper, the copper stock in 7 end-uses in Japan was estimated with the bottom-up approach, and compared with the results obtained with top-down approach in our previous study. The results obtained by the two approaches fairly corresponded with each other. So, it is suggested that complementary use of these two approaches is helpful to estimate in-use stock of materials.<br>
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MATERIALS TRANSACTIONS 50(7) 1871-1874 2009年7月 査読有り
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2009 IEEE International Symposium on Sustainable Systems and Technology, ISSST '09 in Cooperation with 2009 IEEE International Symposium on Technology and Society, ISTAS 2009年We assessed a multipurpose Information and Communications Technology (ICT) service that provides multiple services by using a Gross Social Feel-good (GSF) index that we had previously used to assess single purpose services. It is difficult to integrate the assessment results of each service when assessing multipurpose services because of shared hardware and the synergy effect. However, we found that the multipurpose ICT service could be assessed well with the GSF index which indicates the users' interest and satisfaction, and it was possible to incorporate shared hardware, the synergy effect and a weighting factor.
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2009 IEEE International Symposium on Sustainable Systems and Technology, ISSST '09 in Cooperation with 2009 IEEE International Symposium on Technology and Society, ISTAS 2009年The metals contained in various mobile phones were analyzed. More than 20 elements were detected and their net amounts were found to increase year by year. The environmental and economic impacts were assessed based on an elemental analysis. The CO2 emissions generated by the incineration of plastics were estimated to be almost the same as those avoided by recovering the metals. Gold had the biggest economic impact. However, the amount of gold is decreasing and an eco-design for improved recycling is an urgent problem.
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2009 JOINT URBAN REMOTE SENSING EVENT, VOLS 1-3 1670-+ 2009年 査読有りMaterial in-use stock, which represents a future potential of material recovery and waste, is an important factor in analysis of resources recycling. In-use stock is usually estimated using some statistics. In developing countries, however, such statistical data is not usually available to estimate in-use stock of materials. Therefore an alternative method is required in these countries. In this paper, a novel approach was shown to estimate a distribution of material, eg. copper, etc. stock in the world, using aboveground light images taken from space. Defense Meteorological Satellite Program (DMSP) / Operational Linescan System (OLS) nocturnal images are converted into the cloud-free visible light distribution image on all over the earth. The visible light is used exclusively in residential, commercial, industrial, public facilities and roadways. In previous studies, the relation between the strength of nocturnal tight and human activity (eg. population, GDP, energy utilization) has been studied. If we assumed that wherever the fight exists the conducting material, such as copper should be used, the in-stock of materials can be estimated from the net of the tight. In this study, the cloud-free DMSP composites of 1 km spatial resolution data generated by National Geophysical Data Center in U.S.A were applied on mapping a distribution of material stock. The net of light in an area were calculated from the image data, as an Illuminated Urban Area (TUA) dome volume. As a result, IUA dome volume shows strong correlation with copper stock. DMSP images may prove to be a useful tool to know in-use stock distributions in regions. This method is more suitable for the analysis concerning to developing countries where statistics may not be available.
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日本金屬學會誌 72(11) 852-855 2008年11月We developed a novel methodology to analyze world-scale stock-in-use of copper by using a nighttime light image. Radiance calibrated nighttime light imaged data (RCD) of the world has been assembled from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) by the National Geophysical Data Center. It has been recognized that the intensities of nighttime light are strongly associated with human settlement, such as population density and energy consumption. We assumed that wherever the light exists the electrical conducting material, such as copper should be used. The stock-in-use data of copper such as in Japan, North America, Australia and China were obtained from existing studies on material flow analysis. We analyzed the relationship between the light accumulation density and the amount of stock of copper in those countries. A significant correlation was found and the feasibility of this method was confirmed. We applied this method to analyze stock-in-use in other Asian countries. The in-use stock of copper was correlated with gross domestic product (GDP).<br>
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2008 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRONICS AND THE ENVIRONMENT 390-+ 2008年 査読有りThe environmental, social and economic impacts of videoconferencing in the USA and Japan were evaluated and compared quantitatively. For this purpose we used a new index, named the "Gross Social Feel-good (GSF) index", which was developed for evaluating both the positive and negative effects of ICT services. The impacts of videoconferencing in the two countries were different especially as regards the economy and social (comfort) indexes. This case study clarified the difficulties involved in applying the GSF index to different countries.
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PROCEEDINGS OF THE 2007 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRONICS & THE ENVIRONMENT, CONFERENCE RECORD 1-+ 2007年 査読有りIn recent years, a growing number of companies have been using eco-efficiency as an indicator of environmental performance in Japan. In 2006, Japan Environmental Efficiency Forum developed the Information and Communications Technology (ICT) Eco-Efficiency Evaluation Guidelines, which activated implementation of eco-efficiency evaluations for ICT by Japanese industries. This presentation will focus on the state of knowledge of evaluation of environmental impact of ICT as well as the development of eco-efficiency guidelines for ICT in Japan. In addition, a comparative eco-efficiency case study for a videoconference and face-to-face meeting are presented.
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PROCEEDINGS OF THE 2007 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRONICS & THE ENVIRONMENT, CONFERENCE RECORD 12-+ 2007年 査読有りWe determined the material flow of a Japanese telephone corporation. We used a modified input-output table intended for LCA and found that the calculated annual input flow in weight was 93% compared with the annual output flow. This result indicates the change in total assets. We suggest that we could use this method for calculating the macro material flow.
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PROCEEDINGS OF THE 2006 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRONICS & THE ENVIRONMENT, CONFERENCE RECORD 179-+ 2006年 査読有りWe have proposed a new concept for evaluating the contribution of information and communications technology (ICT) services to the formation of a sustainable society and introduced a term for expressing the degree of attainment of various activities. We investigated the amount of misoperation-induced loss that occurs when using a conventional system before the introduction of ICT services and defined this amount as the "reduction potential". For example, we showed that the potential of a "food purchasing and consumption management system" was about 0.5 million tons of CO2.
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PROCEEDINGS OF THE 2006 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRONICS & THE ENVIRONMENT, CONFERENCE RECORD 288-+ 2006年 査読有りThis paper investigates the issues that need to be considered when comparing the environmental impacts of videoconferences and face-to-face meetings. The first part of this paper deals with how the total environmental loads including ripple effects were evaluated. The results show that about 80% less CO2 is emitted from a face-to-face meeting than from a videoconference. More than 95% of the CO2 emissions from a videoconference arise from ripple effects, such as the extra time and money used for other business activities. The second part covers a new method for correcting the environmental burdens related to the different functions of a virtual meeting and a real meeting using a "performance indicator". The performance indicator has three components, achievement, comfort and satisfaction, and is evaluated with user questionnaires and experimental results.
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Fourth International Symposium on Environmentally Conscious Design and Inverse Manufacturing, Proceedings 942-943 2005年 査読有りThe extended environmental impact of e-learning was studied including ripple effects. E-learning changes the user's lifestyle and the various changes (ripple effects) were quantified by using an Internet questionnaire. The environmental burdens were evaluated with LCA and the results were shown as carbon dioxide (CO2) emissions. E-learning can reduce the CO2 emissions generated by conventional training by an average of 95%.
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J. Advanced Science 13(3) 234-238 2001年 査読有りWooden cable drums are used for transporting and installing communication cables. They are used outdoors and are easily damaged by mishandling and use in harsh environments. Recently, plastic drums have been considered as a possible replacement for wooden drums. However, plastic products are made from oil, fossil fuel, and their environmental effects are much debated. We have conducted a field survey, and used it as a basis for models. We have also undertaken an inventory analysis and impact assessment. The results are sensitive to drum weight and the number of times the drum is reused. We also discuss a way to reduce the environmental impact of these plastic drums.
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電子情報通信学会技術研究報告. EID, 電子ディスプレイ 95(155) 7-12 1995年7月20日光学活性アルカノイル基を有する新規の高分子強誘電性液晶を合成した。これらの高分子液晶は、応答速度決定の要因となる自発分極が大きいことが特徴で、特に2つのキラル構造を有するものは500nC/cm^2を越える非常に大きな自発分極を示した。応答速度や熱特性をさらに向上させるため共重合体・組成物について検討した結果、相溶性だけでなく、液晶基の並び方についても制御することが重要であることがわかった。また、高分子液晶組成物を用いたフィルム素子を試作したところ、薄くて軽いだけではなく、耐衝撃性にすぐれた素子であることを確認した。
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Ferroelectrics 148(1) 277-283 1993年 査読有り
MISC
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日本LCA学会誌 11(1) 32-40 2015年<b>Objective.</b> The objective of this research is to analyze the environmental impact of printed matter using rice ink with the consideration of the impact of land use change and using reclaimed vegetable oil based on LCA method.<BR><b>Method.</b> Several scenarios changing the raw materials (soy oil, recycled oil, rice bran) have prepared and evaluated environmental impacts of printed matter. 1000 print for A4 size paper was adopted as functional unit. System boundary in this study covered manufacturing raw materials, mixture, making ink, pulp production, printing and transportation. Recycling paper and disposal of used paper were excluded from the scope. Primary data was collected for the process of making ink in this study. Impact assessment was also applied as well as inventory analysis. Damage assessment and weighting were applied so that potential environmental impacts of several impact categories can be compared. LIME2 was adopted to carry out LCIA. <BR><b>Results and Discussion.</b> A LCA of printed matter using soy ink and rice ink was carried out by using MiLCA software. With regard to the result of LCA for paper with ink, environmental impact of paper occupied the almost of total regardless of the types of ink. When we compared the environmental impacts between the inks, we found that environmental impact of rice ink was smaller than that of the other types of inks. Impact of land use for rice ink was smaller than the others, because allocated area for cultivating rice bran (co-product of polished rice) was estimated smaller. Furthermore, the use of reclaimed oil enables to decrease of land use impacts. On the other hand, environmental impact of soy ink is almost equal with that of conventional ink, because the land use area for cultivating soy beans are higher than that rice bran.<BR><b>Conclusions.</b> Using reclaimed oil and co-products for raw material are key points for the reduction of environmental impacts of inks. We found that rice oil taking the both advantages make possible to reduce environmental impacts to ecosystem.
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電子情報通信学会総合大会講演論文集 2011 157-157 2011年2月28日
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日本LCA学会研究発表会講演要旨集 2011 101-101 2011年2010年10月に名古屋で生物多様性条約第10回締約国会議（COP10）が開催され、生物多様性の損失要因に森林伐採等の自然環境の破壊や汚染が挙げられた。紙の主原料のパルプは森林を伐採して作られるため、環境負荷の中でも「生物多様性」や「一次生産」への影響が懸念されている。本研究では広く普及している紙製品として、約9800万部発行されている電話帳の評価を行い、「生物多様性」と「一次生産」の影響を定量的に算出した。
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日本LCA学会研究発表会講演要旨集 2011 56-56 2011年携帯電話、携帯音楽プレーヤーといった小型電子機器に含まれる貴金属、レアメタルを対象に、製品の資源使用量、及び使用済み製品中の資源蓄積量の推計を行うことにより、日本における動的マテリアルフロー分析を行った結果を発表する。また、その分析をもとにして、複数の製品の機能を1つの製品に集約することによる、資源消費の削減効果についての評価を発表する。
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電子情報通信学会ソサイエティ大会講演論文集 2010 126-126 2010年8月31日
書籍等出版物
2主要な講演・口頭発表等
89担当経験のある科目(授業)
7産業財産権
36社会貢献活動
4教育内容やその他の工夫
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年月日（From）2008/04件名小型家電の実習概要小型家電実機を解体し、資源含有量、環境負荷、リサイクルコストの推算を行う評価ツールを自作し、学生自ら、体験し、課題を見出すようにしている。
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年月日（From）2017/04件名工場等見学概要リサイクル工場等を見学し、自身の廃棄したものがどのように資源に戻っていくのかを視察することにより、学習した内容の理解を深める。
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件名実務者による講演概要リサイクルやライフサイクルアセスメントの実務者を外部から招き、最先端の技術を学習し、かつ意見交換により、学習した内容の理解を深める。
その他教育活動上特記すべき事項
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年月日（From）2013/04年月日（To）2017/03件名博士後期課程大学院生の論文指導概要金沢大学大学院で博士後期課程の大学院生の論文指導に当たった。平成26年度には、2名の学生の論文審査委員会において主査を務めた。
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年月日（From）2013/04件名通信教育概要武蔵野大学の通信教育において、多数の学生の添削指導を行った。
教育上の能力に関する大学等の評価
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件名博士後期課程の学位審査年月日（From)2014/10年月日（To)2015/09概要金沢大学大学院博士後期課程の論文審査委員会において主査を務めた。
実務経験を有する者についての特記事項（教育上の能力）
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件名外部講師および非常勤講師概要日本電子電話会社在職中に首都大学東京、東京大学の外部講師、金沢大学および武蔵野大学において非常勤講師をつとめた。
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件名インターンの指導概要大学生の夏期実習および卒業論文の指導にあった。（計4名）
資格・免許
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件名中学校・高等学校教諭一級普通免許（理科）概要昭和63年3月
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件名特定化学物質等作業主任者概要平成3年6月
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件名有機溶剤作業主任者概要平成3年12月
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件名危険物取扱者（甲種）概要平成7年２月
実務経験を有する者についての特記事項（職務上の実績）
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件名研究テーマ指導者概要企業内研究所において新入社員の研究指導を行った。（計2名）
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件名新入社員研究チューター年月日（From)1992/09年月日（To)1992/11概要研究所配属の新入社員向けの集合研修の指導を行った。
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件名東京大学との共同研究年月日（From)2008/04年月日（To)2012/03概要リサイクル技術に関する共同研究
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件名東京都市大学との共同研究年月日（From)2011/04年月日（To)2014/03概要生物多様性評価に関する共同研究
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件名産業技術総合研究所との共同研究年月日（From)2012/04年月日（To)2013/03概要環境影響評価（土地利用）に関する共同研究
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件名オレンジ（旧フランステレコム）との共同研究年月日（From)2005/04年月日（To)2014/03概要ICTサービスの社会影響評価指標の共同開発