Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本設計工学会  

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Authorship：Last author   Publisher：Springer Nature Singapore  

DOI： 10.1007/978-981-99-3818-6_31

DOI： 10.1299/jamdsm.2024jamdsm0094_references_DOI_GjKDN6elbAKXldo48ArRpdfgMuf

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：InderScience Publishers  

The depletion of natural resources and global warming have increased in severity globally. In the industrial field, assembly products, such as electronic products, should be disassembled for recycling and reuse to deal with these problems. Reuse and recycling can contribute to reducing GreenHouse Gas (GHG) emissions and less depletion of natural resources since GHG emissions for virgin material production can be saved using reused components and recycled materials. However, each component of selling revenue and material-based GHG emissions depends on the country because of the different energy mixes of electrical power. Moreover, each collected component embedded in End-of-Life (EOL) products needs to be selected as a life cycle option based on its remaining life. The purpose of this study is to decide life cycle options such as reuse, recycling, and disposal of each component environmentally-friendly and economically in Korea and Japanese cases for computers. Firstly, selecting the life cycle option for each component was formulated by 0–1 integer programming with ε constraints. Next, GHG emissions, profits, and costs in Korea and Japan were estimated and analyzed for each component. Finally, Korean and Japanese cases were analyzed to obtain an economic value in the same material-based GHG saving rate with each component’s life cycle option selection by comparing each EOL product data. In the experiments, GHG recovery efficiency was higher in Japan 43 [g/Yen] than one in Korea 28 [g/Yen]. Therefore, it was better to retrieve and reutilize the components in Korea. However, if the maximum GHG recovery efficiency is desired, Japan is a better option.

DOI： 10.3390/recycling6030055

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

DOI： 10.1299/jamdsm.2021jamdsm0022

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：Transdisciplinary Federation of Science and Technology  

People have both expectations and fears about current AI, which has begun to be integrated into our
society through products and services. However, Generation Z, who has been around digital device such as smart
phones since they were born and have a new sense of values, will play a leading role in the future society in which
AI and people collaborate. Therefore, it is necessary to understand the expectations and fears about AI from their
own words.<br>
In this study, we conduct a questionnaire survey on current AI for Generation Z and text mining to extract
information from a large amount of text data, and discusses the research and challenges involved.

DOI： 10.11487/oukan.2021.0_a-3-5

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Design Engineering  

Traditionally, parameter design based on quality engineering and securing a high level of robustness have been necessary in the design of measuring apparatus. In parameter design, the level values for control factors can be expressed through point values. An optimal condition is selected from among the defined level values when combining the control factors with a high signal-to-noise (SN) ratio. However, to perform additional searches for conditions adjacent to the level values, additional tests using nontraditional experiment conditions are necessary. This paper proposes a robust design method for searching outside level values of design parameter by expressing the control factors as a range of values rather than point values. The proposed design method evaluates a range solution for conditions with a high SN ratio by introducing evaluation indicators that take into consideration the intent of the designer. This study derives the range solution with optimal conditions estimated in conventional parameter design by applying the proposed method to the design of a T-peel test apparatus for delamination. The results confirmed that using the proposed method, an outside level value for high SN ratio range solution defined in the parameter design can be derived.

DOI： 10.14953/jjsde.2020.2891

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.20965/ijat.2020.p0930

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

Automobile repair options include three types: new, rebuilt, and reused parts. Both rebuilt and reused parts are manufactured from used parts, so environmental impact and cost are lower than new parts. However, rebuilt parts need more manufacturing processes than reused parts for overhaul, so they need more environmental impact and cost than reused parts. Therefore, compared with new, rebuilt, and reused parts, product value is high in order new, rebuilt, and reused parts, but environmental and economic performance are high in inverse order. Hence, it is difficult for automobile users to evaluate which repair option is high adaptability for them over the entire lifecycle of an automobile. Besides, the adaptability may change depending on the difference of user’s intension. This paper proposes adaptability assessment method of automobile repair options in terms of product value, environmental impact, and cost. Product value of automobile parts is assessed by distributing product value of an automobile to each part. Environmental impact is calculated by life cycle assessment method. Cost is calculated by life cycle costing method. Proposed method is applied to the automobile engines as a case study and shows that users who emphasize environmental and economic performance have high adaptability to reused parts, and users who do not emphasize them have high adaptability to rebuilt parts. This paper discusses that automobile recycled parts have higher performance than new parts in terms of product value, environmental impact, and cost.

DOI： 10.1299/transjsme.20-00163

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Fuji Press  

DOI： 10.20965/ijat.2020.p0919

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DOI： 10.20965/ijat.2020.p0723

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：設計工学  

DOI： 10.14953/jjsde.2019.2872

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：設計工学  

DOI： 10.14953/jjsde.2019.2872

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DOI： 10.1016/j.ijpe.2019.107545

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Design Engineering  

Manufacturing has been required to reduce greenhouse gases (GHG) to deal with global warming. GHG emissions and procurement costs for a virgin material production depend on not only material types and weight determined at a product design phase but also manufactured countries because of its energy mix of the electric power. Then, product designers with multiple of design considerations need to take into account of both GHG emissions and procurement cost in selecting types of materials for each part. To visualize GHG emissions and procurement costs, an estimation method based on life cycle inventory (LCI) database with the Asian International Input-Output Table has been developed. However, the estimation method often causes longer estimation time and errors for inputting data throughout the estimation processes because the method requires to refer to several different databases manually. This study focuses on assembly products/materials produced in 9 countries including Japan, and develops a decision support tool for GHG emissions and procurement costs with material recommendation by the LCI database using Asian International Input-Output Table. The developed tool enables to estimate GHG emissions and procurement cost simultaneously and automatically for each part by only inputting its material type and weight. Moreover, the material recommendation function suggests alternative materials based on reduction targets of GHG emissions and procurement costs. First, LCI database is introduced to estimate GHG emissions and procurement costs. Next, it is described processes of automatic calculation in the developed tool and recommendation function for GHG emissions and procurement costs. Finally, user tests are conducted to validate the developed tool.

DOI： 10.14953/jjsde.2019.2852

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18H03824/

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Inderscience Publishers Ltd.  

DOI： 10.1504/IJSM.2021.116845

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1299/jamdsm.2020jamdsm002

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Design Engineering  

Manufacturing has been required to reduce greenhouse gases (GHG) to deal with global warming. GHG emissions and procurement costs for a virgin material production depend on not only material types and weight determined at a product design phase but also manufactured countries because of its energy mix of the electric power. Then, product designers with multiple of design considerations need to take into account of both GHG emissions and procurement cost in selecting types of materials for each part. To visualize GHG emissions and procurement costs, an estimation method based on life cycle inventory (LCI) database with the Asian International Input-Output Table has been developed. However, the estimation method often causes longer estimation time and errors for inputting data throughout the estimation processes because the method requires to refer to several different databases manually. This study focuses on assembly products/materials produced in 9 countries including Japan, and develops a decision support tool for GHG emissions and procurement costs with material recommendation by the LCI database using Asian International Input-Output Table. The developed tool enables to estimate GHG emissions and procurement cost simultaneously and automatically for each part by only inputting its material type and weight. Moreover, the material recommendation function suggests alternative materials based on reduction targets of GHG emissions and procurement costs. First, LCI database is introduced to estimate GHG emissions and procurement costs. Next, it is described processes of automatic calculation in the developed tool and recommendation function for GHG emissions and procurement costs. Finally, user tests are conducted to validate the developed tool.

DOI： 10.14953/jjsde.2019.2852

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18H03824/

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In recent years, needs of users have been diversified, and it is necessary not only to simply improve the quality of the products but also to satisfy the potential needs of the users. Therefore, this study proposes an evaluation grid method system that extracts the diverse user needs and the related design variables by visualizing the evaluation structure of the user's products and services. In the conventional evaluation grid method, it took a lot of time and effort to make the evaluation structure diagram of the users because it was very difficult to put together a complicated and large-scale evaluation structure diagram in case there are a large number of people surveyed. However, the proposed evaluation grid method system can handle a lot of subjects, and the design variables can be quantitatively evaluated by weighting the importance degree. In other words, this system allows designers to clarify the design variables related user needs. This system is applied to UI design of SNS to explain its convenience and novelty.

DOI： 10.1299/jsmedsd.2020.30.1403

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In the early stages of design, "desired" or "acceptable" performance is not defined under clear design information , and the design must be carried out under conditions of uncertain design information. Decision-making in the early design phase are also important because the result of the decision-making is used to define later design requirements, such as detailed design stages. In addition, if the design solution derived from the early design stage does not meet the required performance due to design changes during the design process, a design rework step will occur. This study proposes a decision support system based on set-based design that derives a feasible range of design variables in the early stage of design, where there is a lot of uncertain design information and design changes are likely to occur. The proposed system is also applied to an automobile damper model to confirm its usefulness.

DOI： 10.1299/jsmedsd.2020.30.3203

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

To contribute to a sustainable society, product design must consider not only quality, cost and delivery time, but also environmental load. To accomplish this, products and their parts should be modular in design to consider future reuse, remanufacture, and upgrade possibilities. Conventional modular design methods generally focused on either reducing the developmental lead time or the financial cost of designing a competitive product family. However, considering resource efficiency not only in terms of future reuse but also during the production and procurement stages is essential for designers. Therefore, this paper proposes a comprehensive evaluation index from four perspectives, which includes quality, cost and lead time, as well as environmental impact, in order to enhance sustainability. This index is established in the context of supply chain management involving multiple product architecture candidates with diverse modularization granularity. The proposed index takes into account changes in component weight due to differences in product architecture and the associated changes in manufacturing lead time due to differences in assemblability, and changes in transportation routes, payroll levels and energy composition due to differences in suppliers. To enable the calculation of the index, this study also develops a design support system. The design system implementing the proposed method was applied to the design of a laptop and verified, whereby appropriate architecture candidates are successfully automatically derived from a supply chain perspective.

DOI： 10.1299/jsmedsd.2020.30.2202

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.promfg.2020.01.276

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Scientific Research Publishing  

DOI： 10.4236/ajor.2019.94011

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16K01262/

Publishing type：Part of collection (book)  

DOI： 10.1007/978-981-13-1196-3_24

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1299/jamdsm.2018jamdsm0080

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

To achieve sustainable consumption and production, designers and manufacturers should provide products with low environmental load and low cost to user. Upgrade design improves and add the product function by exchanging only a few of its components, and then enhance product value. So, modularization is necessary to exchange the components easy. Traditional modular design methods primarily focus to reduce the lead time or costs associated with designing an entire family of products. However, resource efficiency is an important consideration associated with upgrade for a product. Therefore, this paper proposes a design method to derive an appropriate product architecture when determining the number of upgrading of the components and the support period for upgradeable products. After deriving modular architecture candidates, the proposed method is used to evaluate the environmental load and cost generated at manufacture and use by upgrading and derive for a product architecture that realizes low environmental load and low cost throughout the product life cycle. This study applies the proposed method to laptop computer design and derives an appropriate modular architecture.

DOI： 10.1299/jsmedsd.2018.28.2209

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.promfg.2018.02.129

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/IIAI-AAI.2018.00147

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOS Press BV  

DOI： 10.3233/978-1-61499-898-3-1155

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper proposes an evaluation method for adaptability of lifecycle options applied to components of multigenerational product. The purpose of this method is to provide a guideline to designer for designing multi-generational product that belongs Upgradable Product Service System: Up-PSS with consideration of multiple consumer segment’s intentions. In additon, proposed method consists of an evaluation indicator and its evaluation process. Usually, developing upgradable product needs to predict future market trend, procurement cost and so on in the early design phase. Therefore, a designer has to consider many uncertain design information. This study defines such information which is used as evaluation variables in proposal indicator as ranged value. By using these evaluation variables, proposed index comprehensively evaluates component-adaptability of lifecycle options from multiple perspectives which are categorized into consumer satisfaction, econimy, environment, and reliability. For representing intention of cosumer segment, this method derives priority of every evaluation variable which is corresponding to each segment. By exponentiating evluation variable by priority, this method derives adaptability of lifecycle options with consideration of multiple consumer segments. The authors evaluate laptop’s module-adaptabilities of lifecycle options (refurbish with upgrade, remanufacturing, and long life) by proposed index as a case study. From the result of this evaluation, proposal index is able to provide a guideline which is the decision-making of exchanging or upgrading components and selection of platform components for developing upgradable product service.

DOI： 10.1299/jsmedsd.2018.28.2215

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.cie.2017.07.032

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/IIAI-AAI.2017.160

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

<p>To make sustainable society come true, product design is required to consider environmental issues such as reduction of resource usage, product disposal, and environmental loads. Many approaches for resolving these issues such as reuse, remanufacturing, and upgradable designs are studied and implemented. To apply these design approaches to product appropriately, a designer has to understand their characteristics and evaluate the product's adaptability for these design options. Hence, this paper evaluates the advantage of these design approaches. The ultimate purpose of this study is proposal of an adaptability evaluation method of product reusability, remanufacturability, and upgradability to support designer's decision making of product or component life cycle options at the early phase of design process. Thus, this paper speculates the appropriate perspectives of these evaluations and proposes conceptual evaluation method based on the viewpoints of society (low environmental load emission), manufacturer (low production cost and high profit), and consumer (low life cycle cost and high performance). Proposed evaluation method evaluates laptop's adaptabilities of aforementioned life cycle options quantitatively and shows that upgrading can satisfy the intents of environmental load emission, production cost, and life cycle cost. In addition, the agendas of this study are emerged. Particularly, evaluation perspectives with respect to product disassemblability, reliability, and pleasurability should be added. Additionally, improving evaluation method that can evaluate multiple perspectives comprehensively is also this study's agenda.</p>

DOI： 10.1299/transjsme.17-00082

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本設備管理学会  

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26282082/

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper proposes an index for evaluating product module’s adaptabilities of lifecycle options. The purpose of this index is to provide designer a guideline for designing multi-generational product that belongs Upgradable Product Service System: Up-PSS. Usually, developing upgradable product needs to predict future market trend, procurement cost and so on in the early design phase. Therefore, a designer has to consider many uncertain design information. This study defines such information which is used for evaluation perspectives in proposal index as ranged value. In addition, proposal index evaluates module’s upgradability, remanufacturability, and reusability by using ranged parameter and concept of set-based design for adapting such uncertainty. Previously proposed indexes evaluate component’s lifecycle options without a consideration of economic and environmental perspectives and requires complicated calculation algorithm. These characteristics are burdens on a designer who is required not only to design product but also to analyze product features. For these conditions surrounding a designer, proposal index comprehensively evaluates component-adaptability of lifecycle options by four evaluation perspectives: functional (priority of a module), economic (production cost), environmental (CO2 emission at the production phase), and reliability (durable life) perspectives. Furthermore, this index requires only simple computation rule and prevailing spreadsheet software. The authors evaluate laptop’s moduleadaptabilities of aforementioned three lifecycle options by proposal index as a case study. From the result of this evaluation, proposal index is able to provide a guideline which is the decision-making of providing function and selection of platform components etc. for developing upgradable product service.

DOI： 10.1299/jsmedsd.2017.27.1403

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

To desire a sustainable society, circular economy for End-of-Life (EOL) assembled products has been required. To recycle or to reuse the parts of the EOL. assembled products, manual disassembly is required which has higher cost due to labor one. To establish environmental but economic recycling factories in practice, disassembly or crushing is selected for each part considering recycling rate and cost. Igarashi et al. (2014) proposed a disassembly parts selection considering the recycling rate and cost. However, part reuse is not considered. This study proposes the disassembly parts selection with minimization of cost and maximization of recovery rate including recycling and reuse considering life expectancy of parts.

DOI： 10.1299/jsmemsd.2017.503

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.promfg.2017.02.059

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Industrial Management Association  

DOI： 10.11221/jima.67.156

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Industrial Management Association  

Modern assembly products are often manufactured and transported as a part of a global supply chain, where suppliers are selected to reduce procurement costs among multiple industrialized and emerging countries in Asia. Additionally, for environmental conscious manufacturing, it is important to visualize and reduce greenhouse gas (GHG) emissions for productions and logistics in whole global supply chains in order to resolve global warming problems. According to life cycle assessment (LCA), which quantitatively measures GHG emissions, even if the same types of materials are used in parts and components production, each part has a different level of GHG emissions and procurement cost depending on the country where it is manufactured. Therefore, the designing of a low-carbon supply chain requires the selection of appropriate material based low-carbon suppliers and making economic decisions using a life cycle inventory (LCI) database. To construct low-carbon supply chains that combine production of each part in various Asian countries, this study proposes a low-carbon and economic supplier selection method that utilizes an estimation of the GHG emissions and an affordable cost increment for each part using a LCI database developed incorporating Asian international input-output (I/O) tables. First, the GHG emissions for the production of each part in multiple Asian countries are estimated using the LCI database. Next, a bill of materials (BOM) with the GHG emissions and the procurement costs for each part is constructed in the cases of multiple production countries. Finally, the suppliers for producing each part are selected among the countries by integer programming in order to balance the reduction of GHG emissions and procurement costs.

DOI： 10.11221/jima.66.435

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jmsy.2015.11.002

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.procir.2016.01.092

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DOI： 10.1299/jamdsm.2016jamdsm0052

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.3233/978-1-61499-684-2-405

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.procir.2016.03.015

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Language：Japanese   Publishing type：Research paper (scientific journal)  

Closed-loop supply chains for assembly products are essential to prevent material starvation. The systems consist of both the assembly and disassembly for reuse and recycling. To establish sustainable manufacturing economically and environmentally, the number of work stations in the both systems should be reduced. However, the bottlenecks for the both operation cost and precedence relationship may be different in assembly and disassembly. Thus, the product and the production system designs cosidering both assembly and disassembly are required. This study proposes a comparison analysis of the disassembly/assembly operations and systems between the product and production designs. First, the bill of materials and the precedence relationship are constructed Assembly Reliability Evaluation Method (AREM) and Recyclability Evaluation Method (REM) provided by Hitachi, Ltd. Next, it performs the line balancing using the integer programming. Finally, the alternative plans in the assembly and disassembly lines are quantitatively evaluated in term of both product and production system designs.

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Publisher：Trans Tech Publications, Ltd.  

<jats:p>An upgrade product design method is one of the efficient design methods for reducing environmental loads caused by mass production, consumption, and disposal. This method seeks to design a product that can adapt to future required performance and functions via component upgrade by exchanging components in the early phase of design. Because considerations of future product performance and functions include uncertain design information, an accurate prediction is very difficult. Therefore, this study defines uncertain design information as ranged sets, and applies a preference set-based design method that can correspondingly obtain ranged sets of design solutions. In previous studies, proposed methods were focused on product performance enhancement without quantitative consideration of environmental loads. Hence, this study proposes an upgrade product design method that can address the enhancement of product performance, while concurrently reducing production cost and environmental load, which is herein strictly defined as the amount of CO<jats:sub>2</jats:sub> emission. Finally, our proposed upgrade product design method is applied to a laptop PC design problem to demonstrate its utility.</jats:p>

DOI： 10.4028/www.scientific.net/amm.761.589

DOI： 10.20965/ijat.2016.p0690_references_DOI_a4KSut95lgvXPcMOxG1e3swMDTZ

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26870628/

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

This paper proposes upgradeable product design method which is the one of the environmental product design methods. Proposed method focuses on manufacturer's sustainability and designs upgradeable products which satisfy the manufacturer's yieldability and environmental responsibilities. Upgradeable product design method inhibits the disposal of an item by replacing only the few components related to its deterioration in value, as opposed to disposing the entire product. In addition, this method usually required to predict future required functions. To address the uncertain design information associated by future prediction of required product functions and component procurement cost, this study obtains ranged design solution which can adapt to future uncertainty by applying set-based design method which can obtain ranged design solutions to proposed upgradeable product design method. By applying to a leased laptop computer case study, proposed method obtains ranged design solution which realizes low environmental loads, low product price, and high profitable upgradeable product. These results indicate the effectiveness of proposed upgradeable product design method for building of a sustainable society.

DOI： 10.1299/jsmedsd.2015.25._1214-1_

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Management Training Center  

Recently, supply chains have come to be used globally, not only in developed countries such as Japan but also in emerging countries such as China. Supplier selections are one of the key decisions to be made in a strategic planning of the supply chains, where the manufacturers for assembly products have to select the suppliers that are appropriate for their specific purposes, especially for lower procurement costs of parts. Additionally, global warming is worsening due to increased greenhouse gases (GHG), CO₂being the major culprit. In order to achieve a low-carbon society that is against global warming, it is necessary to reduce the CO₂emissions across the globe by means of a low-carbon supply chain; before that, the CO₂emissions in the supply chains should be visualized and used for any decision making in each process design. However, it is often difficult for assembly companies to share their environmental and cost information with their suppliers since there are other companies in the supply chains. For visualizing the CO₂emissions,"Life Cycle Assessment (LCA) "and"Life Cycle Inventory (LCI) Database "have been established. According to the LCI database, the CO₂emissions of the parts depend on types of materials and weights. Therefore, it is important to select the suppliers considering the types of materials and the weights for each part, in order to reduce not only the procurement cost but also the CO₂emissions. This study proposes a low-carbon supplier selection method with an estimation of CO₂emissions and cost based on material analysis, so as to aim to achieve both the procurement cost minimization and the CO₂emissions reduction using the LCI database.

DOI： 10.14327/iscm.8.159

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Other Link： https://jlc.jst.go.jp/DN/JLC/20007338395?from=CiNii

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ExcelingTech Publishers  

This paper proposes an upgradable product design method for improving product performance, incurring CO2 savings, and production cost reduction while increasing the product value and extending the value lifespan by exchanging components closely related to the deterioration in value. In addition, this paper proposes a method that can specify future product performance, effective upgradable product components, and the effect of the upgrade on other product components. Finally, this paper discusses the applicability of the proposed method by considering the designing of a vacuum cleaner and customer demands such as performance, noise, and energy savings.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Design Engineering  

Preplanning the life cycle options for each part of a product and evaluating the environmental loads of the product at the early phase of design by applying 3D-CAD lead to resource recycling and significant reductions in the environmental loads for the whole product life cycle. The early phase of design contains multiple sources of uncertainties. This paper proposes a life cycle design support system based on 3D-CAD, which enables a sat-isficing design for both the product performances and the reduction of the environmental loads. The proposed system supports to define the life cycle options and to obtain multi-satisfactory design solution sets by apply-ing a preference set-based design method, which enables a flexible and robust design under various sources of uncertainties. The present study applies the proposed system to a multi-objective problem for technical and environmental performance requirements as an example problem, that is, a cleaner model created by 3D-CAD.

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1016/j.procir.2014.06.083

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DOI： 10.1177/1063293X13493447

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DOI： 10.1080/0951192X.2011.602364

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Industrial Management Association  

To promote a closed-loop supply chain for assembly products, disassembly systems are required to recycle End-of-Life (EOL) products. To increase the total recycling rate of a product at the disassembly systems, it is desirable to keep rather than destroy parts since disassembly costs are increasing. Therefore, a disassembly system design is considered by selecting parts to disassemble in order to minimize the recycling cost while maintaining the recycling rate. On the other hand, since the precedence relation among disassembly tasks of the product also changes with these parts selection, it is required to consider allocation of the tasks in designing a disassembly line. For the disassembly system design, disassembled product information is also necessary such as the recycling rate and profit of each part, disassembly task times and a precedence relation among the disassembly tasks. This study proposes the disassembly system design with environment and economic part selection, which harmonizes the recycling rate and cost by using Recyclability Evaluation Method (REM) provided with Hitachi, Ltd. The first step is to optimize environmental and economic parts selection with integer pro

DOI： 10.11221/jima.64.293

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.3233/978-1-61499-302-5-155

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1504/IJSM.2013.058634

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-1-4471-4426-7-45

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.aei.2012.07.002

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Language：Japanese   Publishing type：Research paper (scientific journal)  

A catalytic muffler design is required the structure that makes emission gas flow smoothly in the muffler for improving the purification efficiency. This paper focuses on the design environment including uncertain design information and applies a preference set-based design method to the catalytic muffler design in the design phase. The design method can obtain a ranged set of design solutions that satisfies performance requirements by representing uncertain design information as ranged sets.

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.aei.2011.07.002

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-0-85729-799-0_45

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1177/1063293X09360833

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-0-85729-024-3_42

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Diverse satisfactory design ideas of form and structure must be obtained under the constraint of unclear design conditions in conceptual and preliminary design. Designers depend on either their experience or their knowledge for obtaining diverse ideas. In the past study, we proposed an emergent design method that was able to obtain the diverse solution candidates was proposed. In the present study, this system was applied to development of the artificial hip aiming at the construction of the emergent design system that generates diverse three dimension form based on the proposal method. The possibility of utilizing this system for the artifact design is shown by comparing with the solutions derived from this system and past optimization method.

DOI： 10.1299/jsmemecjo.2007.6.0_17

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Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society for the Science of Design  

The design method based on reductionism is difficult to apply to the early design process, in which diverse candidates for design solutions are required. We attempt to construct the design method which is obtained diverse design solutions. As a first step, we have constructed the fundamental form-generation method that generates diverse forms without an initial form. The form-generation method was proposed using cellular automata(CA). CA is the self-organizing method by local rules. The rules imitating "induction" and "apical dominance" was inputted to the transition function of CA. The proposed method is possible to generate diverse forms by repetition of generation start with one cube element. The method was applied to form-generation with space restrictions, and the diversity of obtained forms was analyzed. As a result, diverse forms were obtained, and the possibility of applying the method to design of artifacts was shown.

DOI： 10.11247/jssdj.48.39_2

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society for the Science of Design  

In the early stage of design process, many conditions are indefinite. Therefore, it is necessary to obtain diverse design solutions. However, it is difficult for conventional parametric design methods to obtain diverse solutions. We have studied design method that obtains diverse solutions. As a first step, we proposed the form-generation method that obtains diverse forms without setting an initial form in the past research. In this paper, we expanded the form-generation method into the system with the evaluation process, and attempted to apply this system to the artifacts design. In order to obtain diverse solutions efficiently, we adopted genetic algorithm, and destroyed schemata of solutions. We analyzed the diversity of solutions and the efficiency of the search for solutions. As a result, it was shown that design solutions were obtained efficiently with adequate diversity. This indicated that the system is useful for obtaining diverse design solutions.

DOI： 10.11247/jssdj.48.95_1

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Language：Japanese   Publisher：Japanese Society for the Science of Design  

This paper proposes the self-organizing form-generation system that enables to obtain diverse design solutions without an initial form, in order to support design process that requires diverse design solutions. In the past study, cellular automata were expanded into the form-generation method, and the present study, expanded the form-generation method into the system with the evaluation process. Then, genetic algorithm was adopted as a search algorithm, in order to raise the efficiency of form-generation. Finally, the system was applied to a chair design, and as a result, diverse chair forms were obtained. That results indicated the possibility of utilizing the system for an artifacts design.

DOI： 10.11247/jssd.48.0_280

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Language：Japanese   Book type：Scholarly book

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Total pages：690   Language：English   Book type：Scholarly book

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Total pages：1224   Responsible for pages：1155-1164   Language：English  

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Total pages：1224   Responsible for pages：927-935   Language：English  

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Total pages：904   Responsible for pages：337-344   Language：English  

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Responsible for pages：2884-2891   Language：English  

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Total pages：774   Responsible for pages：463-470   Language：English  

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Total pages：226   Language：Japanese   Book type：Scholarly book

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Total pages：550   Responsible for pages：40-44   Language：English  

DOI： 10.1016/j.procir.2016.03.015

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Total pages：716   Responsible for pages：179-184   Language：English  

DOI： 10.1016/j.procir.2016.01.095

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Total pages：716   Responsible for pages：162-167   Language：English  

DOI： 10.1016/j.procir.2016.01.092

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Responsible for pages：589-593   Language：English  

DOI： 10.4028/www.scientific.net/AMM.761.589

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Responsible for pages：664-669   Language：English  

DOI： 10.1016/j.procir.2014.07.107

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Responsible for pages：329-334   Language：English  

DOI： 10.1016/j.procir.2014.07.182

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Responsible for pages：91-100   Language：English  

DOI： 10.1007/978-3-662-45937-9_10

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J-GLOBAL

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DOI： 10.1109/IIAI-AAI.2018.00145

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Language：English  

DOI： 10.1016/j.procir.2016.11.232

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J-GLOBAL

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DOI： 10.1016/j.procir.2014.07.182

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DOI： 10.1016/j.procir.2014.07.107

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DOI： 10.1016/j.procir.2014.07.159

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J-GLOBAL

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Recently, we must depart from the traditional paradigm of mass production, consumption, and disposal. Especially, technologically innovative products are discarded before their breakdowns because of the deterioration of their value. To break away this social circumstance, environmentally conscious product design methods such as reuse, recycle, and upgrade product design method have been studied. An upgrade product design method develops to increase the product's value and inhibit the disposal by exchanging only a few components closely related to its deterioration in value. This method predicts the required future performance criteria and functions and designs products in advance to be compatible with anticipated product upgrades. Hence, designers are required to take account of the uncertain design information associated with future prediction. In the conventional research, proposed methods typically focus on the physical performance improvement. Therefore, these proposed methods couldn't deal with the amount of the environmental load reduction quantitatively. Hence this paper proposes an upgrade product design method that satisfies required uncertain future product performance criteria and functions and adverse effects related to product upgrading concurrently by applying a preference set-based design method that can obtain ranged sets of design solutions that optimally satisfy multi-objective requirements. In addition, this paper evaluates the amount of the environmental load reduction in production phase by applying proposed upgrade product design method to design problem of a laptop PC.

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Language：Japanese   Publisher：一般社団法人 日本機械学会  

Supply chains have been configured globally among not only developed but also developing countries including Asia. For an anti-global warming, it is necessary for assembly manufacturers in the supply chains to visualize and reduce Greenhouse Gas (GHG) emissions by selecting suppliers for each part in across countries as a low-carbon supply chain. Each part has a different procurement cost by the suppliers while their GHG emissions for each part production depend on each country produced. Therefore, a Life Cycle Inventory (LCI)database has been developed by the Asian international input-output (I/O) table in order to calculate an environmental impact for each Asian country. This study proposes a low-carbon supplier selection method so as aiming to achieve both the procurement cost minimization and the environment impact reduction using the LCI database by the Asian international I/O table.

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J-GLOBAL

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In the early phase of structural design, uncertainties arise from many sources of variations. Therefore, the manner in which the uncertainties in the design phase are handled is of great importance. Designers need to figure out an outline of the topological structure and have to compare the evaluation results of diverse design ideas from multiple aspects under some uncertain design information at the design phase. We have proposed a preference set-based design (PSD) method that generates a ranged set of design solutions that satisfy sets of performance requirements under various sources of uncertainties, while capturing a designer's preference. This study proposes a design method for the early phase of structural design that is possible to obtain the multi-objective satisfactory solution with topological and geometrical uncertainty and variability by applying the PSD method to the finite element method. This study discusses the suitability of our proposed approach for obtaining the multi-objective satisfactory solution sets by applying to the design problems of a cantilever with uncertainties of design parameters which define the topology of the structure.

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Language：English  

Japanese manufactures have been moved their production site into emerging countries, especially China which is the largest trading partner for Japan. On the other hand, a supply chain is that properly manages and plans products and information, and nowadays, to reduce an amount of carbon dioxide in the entire supply chain including Asian countries is necessary for greenhouse gas mitigation. This study proposes a designing for supply chain network which parts and the product are transported between two countries considering CO2 volumes of the part production. The model is formulated by mixed integer programming (MIP), and numerical experiences are performed.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

There are a large number of uncertainties of the design variables and the requirements while the decision-making process at the early phase of design has the greatest effect upon the lead time of development and the overall cost. Designers need to figure out an outline of the structural feature and have to compare the evaluation results of diverse design ideas from multiple aspects under some uncertain design information at the early phase of structural design. We have proposed a preference set-based design (PSD) method that generates a ranged set of design solutions that satisfy sets of performance requirements. This study proposes a decision-making support method for the early phase of structural design based on the PSD method that is possible to analyze, obtain and compare diverse design ideas with design uncertainty and variability by elastic FEM. We apply the proposed method to a structural form of a bridge with uncertainties of cross-section area of members and dimension of structure (coordinates of geometry) under fluctuating distribution of performance characteristics of the maximum stress and the mass.

CiNii Research

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Diverse satisfactory design ideas of form and structure must be obtained under the constraint of unclear design conditions in conceptual and preliminary design. Designers depend on either their experience or their knowledge for obtaining diverse ideas. In the past study, we proposed an emergent design method that was able to obtain the diverse solution candidates was proposed. In the present study, this system was applied to development of the artificial hip aiming at the construction of the emergent design system that generates diverse three dimension form based on the proposal method. The possibility of utilizing this system for the artifact design is shown by comparing with the solutions derived from this system and past optimization method.

CiNii Research

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The body lightening of the car is an important problem in the development of a new car. Conventional optimum design methods are difficult to apply in the early process of design referred to as conceptual and preliminary design, in which many design conditions are not completely defined. We applied the proposed emergent design system that can obtain diverse design ideas under the constraint of a few design conditions by globally searching within the solution space to the body in white vehicle and compared with the conventional optimum design methods. The proposed system produced diverse design ideas that have bending, torsion, front impact, and side impact strength equivalent to conventional optimum design methods.

CiNii Research

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Language：Japanese   Publisher：Japanese Society for the Science of Design  

Diverse satisfactory design ideas of form and structure must be obtained under the constraint of unclear design conditions in conceptual and preliminary design. Designers depend on either their experience or their knowledge for obtaining diverse ideas. In a past study, we proposed an emergent design method that was able to obtain the diverse solution candidates was proposed. In this research, this system was applied to development of the artificial hip aiming at the construction of the emergent design system that generates diverse three dimension form based on the proposal method. The possibility of utilizing this system for the artifact design is shown by comparing with the solutions derived from this system and past optimization method.

CiNii Research

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Language：Japanese   Publisher：Japanese Society for the Science of Design  

Design processes are broadly divided into two types: early process and late process. It is difficult to apply the conventional optimization methods in the early processes. A design objective gradually becomes clearer as the processes advance from the early processes to the late. Diverse design ideas must be obtained under the constraint of unclear design conditions by globally searching within the solutions space. The present study proposes a design method based on emergence for obtaining diverse design solutions and a 3-dimensional form-generation system by applying the proposed design method to artifacts design. The proposed system obtains design solutions of adequate diversity whereas the conventional optimization method obtains a unique solution.

CiNii Research

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Language：Japanese  

Diverse satisfactory design ideas of form and structure must be obtained under the constraint of unclear design conditions in conceptual and preliminary design. Designers depend on either their experience or their knowledge for obtaining diverse ideas. In the past study, we proposed an emergent design method that was able to obtain the diverse solution candidates was proposed. In this research, this system was applied to development of the artificial hip aiming at the construction of the emergent design system that generates diverse three dimension form based on the proposal method. The possibility of utilizing this system for the artifact design is shown by comparing with the solutions derived from this system and past optimization method.

CiNii Research

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Language：Japanese  

Design processes are broadly divided into two types: early process and late process. It is difficult to apply the conventional optimization methods in the early processes. A design objective gradually becomes clearer as the processes advance from the early processes to the late. Diverse design ideas must be obtained under the constraint of unclear design conditions by globally searching within the solutions space. The present study proposes a design method based on emergence for obtaining diverse design solutions and a 3-dimensional form-generation system by applying the proposed design method to artifacts design. The proposed system obtains design solutions of adequate diversity whereas the conventional optimization method obtains a unique solution.

CiNii Research

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Language：Japanese  

The development of new bodies is required for the car's lightweight body. Conventional optimum design methods are difficult to apply in the early process of design referred to as conceptual and preliminary design, in which many design conditions are not completely defined. We applied the proposed emergent design system that can obtain diverse design ideas under the constraint of a few design conditions by globally searching within the solution space to the body in white vehicle and compared with the conventional optimum design methods. The proposed system produced diverse design ideas that have bending, torsion, front impact, and side impact strength equivalent to conventional optimum design methods.

CiNii Research

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Language：Japanese  

CiNii Research

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2025.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島  

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Event date： 2025.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：山口  

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Event date： 2024.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島  

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Event date： 2024.11

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Venue：広島  

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Event date： 2024.11

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Venue：Zilina   Country/Region：Slovakia  

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Event date： 2024.9

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Venue：大阪  

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Event date： 2024.9

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Venue：大阪  

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Event date： 2024.9

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Venue：大阪  

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Event date： 2024.9

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Venue：大阪  

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Event date： 2024.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Melaka   Country/Region：Malaysia  

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Event date： 2024.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2024.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Berlin   Country/Region：Germany  

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Event date： 2024.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Dubrovnik   Country/Region：Croatia  

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Event date： 2023.11 - 2023.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Nara Prefectural Convention Center  

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Event date： 2023.11 - 2023.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Nara Prefectural Convention Center  

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Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：建築会館  

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Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：建築会館  

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Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：建築会館  

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Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：建築会館  

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Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢商工会議所  

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Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢商工会議所  

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Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢商工会議所  

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Event date： 2023.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Keio University  

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Event date： 2022.12

Language：Japanese   Presentation type：Poster presentation  

Venue：柏の葉カンファレンスセンター  

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Event date： 2022.10 - 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学  

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Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学  

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Event date： 2022.10

Language：Japanese   Presentation type：Poster presentation  

Venue：グランキューブ大阪  

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Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：オンライン開催  

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Event date： 2022.9

Language：Japanese   Presentation type：Poster presentation  

Venue：岡山県立大学  

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Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Virtual Conference  

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Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Virtual Conference  

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Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Virtual Conference   Country/Region：United States  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：English   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Language：English   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学（オンライン）  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学（オンライン）  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学（オンライン）  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学（オンライン）  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kota Kinabalu, MALAYSIA (online oral presentation)  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kota Kinabalu, MALAYSIA (online oral presentation)  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kota Kinabalu, MALAYSIA (online oral presentation)  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kota Kinabalu, MALAYSIA (online oral presentation)  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：電気通信大学（講演論文集発行）  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ミューザ川崎 市民交流室  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Kanazawa  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Yokohama  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Yokohama  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：慶應義塾大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Tohoku University  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Tohoku University  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪電気通信大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪電気通信大学  

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Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Bologna, ITALY  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：関東学院大学  

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Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Duisburg, GERMANY  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：読谷村  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：読谷村  

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Language：Japanese   Presentation type：Poster presentation  

Venue：読谷村  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：読谷村  

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Language：Japanese   Presentation type：Poster presentation  

Venue：読谷村  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：読谷村  

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Language：English   Presentation type：Oral presentation (general)  

Venue：Denizli, TURKEY  

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