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

DOI： 10.1088/1755-1315/588/2/022069

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

DOI： 10.1088/1755-1315/588/4/042039

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3130/aijt.85.545

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

<p>This paper proposes a novel analytical model (BECK chart) to investigate how architecture education programs contribute to learning about the built environment. First the educational content of 67 AIA-supported architecture education programs for children and youth are categorized. Next the model is applied to visualize how these categories relate to the built environment. This analysis aims to contextualize the content of architecture education programs for children and youth in order to evaluate the ways in which these programs provide Built Environment Education content. The value of the model is also discussed.</p>

DOI： 10.3130/aijt.26.808

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Language：Japanese   Publisher：日本建築学会  

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

DOI： https://doi.org/10.1016/j.jclepro.2020.120386

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

DOI： https://doi.org/10.3130/aijt.24.1107

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

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Taylor & Francis  

DOI： 10.1080/20426445.2017.1389835

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

Finding life cycle optimized building designs is a challenging task. It requires the inclusion of all phases of the building life cycle in a single optimization problem. The present study demonstrates a life cycle simulation-based optimization approach, by including the operational carbon footprint (OCF) and embodied carbon footprint (ECF) of a building. Particularly, finding and analyzing the difference between life cycle (OCF þ ECF) optimized design and operational (only OCF) performance-based optimized design is the primary goal of the current study. The life cycle optimization method is applied to a townhouse in Finland to determine carbon-cost optimal designs. Different options of building envelope insulation thicknesses, window types, heating systems, heat recovery units, and PV area are explored as design variables. It has been found that the heating system is a dominant design variable, which results in clearly separated pareto fronts for each system. Generally, a majority of the design variables' optimal values, obtained from OCF þ ECF optimization, suggest thinner insulation for the building envelope and a larger PV area, compared to the optimal solutions from OCF optimization. In a carbon optimal solution, the share of ECF is 39% of the life cycle carbon footprint, whereas in a cost optimal solution, the share of ECF is 28% of the life cycle carbon footprint.

DOI： https://doi.org/10.1016/j.buildenv.2017.06.051

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

DOI： 10.1108/IJDRBE-08-2015-0039

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

This study demonstrates the possibility to use energy-cost optimal building designs based on life cycle approach. There is a lack of studies that cover the comprehensive assessment of both embodied energy (EE) and operational energy (OE) in a single optimization problem. The primary goal of the current study is to compare the optimized results of using OE+EE together and OE only. The optimization is performed on a case study building (townhouse) in Finland with three structural alternatives (i.e., reinforced concrete (RC); cross-laminated timber (CLT) and Steel). Different options for insulation thickness of external wall, roof, floor and window types were considered as decision variables as the scope of the present study is on building envelope. The objectives of the optimization are to minimize life cycle energy (LCE) and life cycle costs (LCC). The LCE difference between the most and least energy efficient solution on the pareto front is greater in case of the OE optimization, compared to OE+EE optimization. For all studied structures, the EE of the optimal solutions from OE+EE optimization ranges 16%–23% of LCE. Many of the non-dominated optimal solutions obtained from the OE+EE optimization shows a higher U-value for the building envelope components compared to the optimal solutions from the OE optimization. A relationship between both OE and EE with the overall thermal resistance of the building envelope is discussed to obtain a deeper understanding of such differences in U-value for the optimal solutions obtained from the OE+EE and OE optimization.

DOI： 10.1016/j.jclepro.2016.12.018

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：BSO2016  

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：World Conference on Timber Engineering Vienna 2016  

Aalto Wood is a focal point for research, education and knowledge in wood construction at Aalto University. Aalto Wood combines wood architecture with structural engineering and wood science to provide a holistic approach to the development of building with wood. At its heart are the faculty members and research staff from the Aalto University School of Arts, Design and Architecture (ARTS), Chemical Technology (CHEM), and Engineering (ENG). This paper presents the activities, discusses the experiences and scenarios for future development.

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：World Conference on Timber Engineering Vienna 2016  

This study discussed how wood in construction can be further developed to enhance the sustainability of buildings through investigating the relationship between frame material selection and the environmental and economic performances of a building in a Finnish context. The results highlighted the importance of selecting building materials from several aspects based upon the purpose and properties of the materials, namely “the right material in the right place”. Especially, since wood has more diverse properties than other common building materials, it would be important to consider a specific approach and use for wood in construction. It was demonstrated by a practical case study that wood products seem to have the possibility to contribute to the the environment more positively with more use, by optimising the weaknesses and maximising the strengths.

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Taylor & Francis  

The aim of this study was to understand the current situation of wooden C&DW in Finland through a survey conducted on the demolition of a case study building. The results revealed that the extent of damage to the recovered wood is more dependent on the location than on the dimension. The condition of recovered wood from an integrated unit part (e.g. exterior wall panel) tended to be worse due to the attachment of other materials (e.g. insulation, plastic sheet), while recovered wood in better condition could be obtained from independent parts (e.g. roof truss, exterior cladding). These results would indicate that the cascading potential for recovered wood should be discussed in terms of both cross-section and location. In particular, the wood used as exterior cladding seems to have good potential for cascading and this could help extend the target for cascading wood from purely wooden building to other buildings.

DOI： 10.1080/20426445.2016.1180495

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

This study has demonstrated the life cycle primary energy balance of the four residential building types (detached house, row house, townhouse and apartment block) based on current Finnish design. The differences in the energy balance arising from the geometrical characteristics of each housing type were investigated using hypothetical building models. In addition, the influence of structural frame material selection was observed in relation to the housing types. The results showed that there are clear differences between the housing types: the detached house is the highest energy consumer, the row house the second (about 20% less), the townhouse the third (about 30% less) and the apartment block the lowest (about 45% less), regardless of the frame materials selection. The differences appeared evenly among the building life cycle stages. A correlation has been observed between the geometrical factors and life cycle primary energy balance of the reference buildings.

DOI： 10.1016/j.enbuild.2015.07.060

Language：English   Publishing type：Doctoral thesis  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

A building is a complex system consisting of many different materials. The material selection, therefore, has a significant role in sustainable building design. This study has demonstrated the influence of material selection on the life cycle energy balance of a building based on current building codes and common building service systems in Finland. The influences of the selection were investigated on a relative basis using a hypothetical building model and in the three building component categories (structural frame, surface components and inner components).

The results showed that, in general, the differences between the alternative materials are rather visible in the production stage of the building and the energy benefit from material recycling. But it was also revealed that the influences of the selection appear differently in each life cycle stage of the building depending on the building component categories. The selection of the structural materials has larger effect than the other two component categories and a combination of different structural frame materials seems to be effective in some cases. The material selection for sheathing, exterior cladding and thermal insulation has a relatively greater influence than the others in the surface and inner components categories. The energy recovery benefits of wood and plastic products have a great influence on the life cycle energy balance of the building.

DOI： 10.1016/j.buildenv.2015.03.001

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer  

This study demonstrates life cycle assessment (LCA) on a reference wooden building according to the latest normative standards: EN 15978, EN 15804 and EN 16485. Global warming potential and primary energy balance over the reference building were assessed in a case study. Through the assessment, the application of the standards was studied. In addition, possible points for development in the standards, especially concerning wood products and wood construction, were discussed from a practical perspective. The lack of proper data is a critical issue in conducting the assessment in compliance with the standards. Since LCA is a data-intensive method, the preparation of data for the building assessment according to the standard is certainly required. This paper also raises questions about the life cycle modules defined in the standards and the importance of the communication system used for the assessment results. It would be of importance to develop the communication system in such a way as to stimulate environmental consciousness in society. In order to develop a relevant communication system, further discussion and case studies would be important and feedback from such practices should be incorporated into the development of the guideline for the assessment.

DOI： 10.1007/s00107-015-0890-4

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

This study demonstrated the influence of building material selection on the environmental and economic parameters of a building in a Finnish context. The effects of the choice were studied for the three building component categories: structural frame, inner components (i.e. insulation and sheathing) and surface components (i.e. exterior cladding and flooring), in a comparative manner on a reference building. The aim was to illustrate the features of the building materials in a relative manner from several aspects in order to help multi-criteria decision-making for professionals associated with the construction industry.

The results showed that the value of alternative materials varies depending on the aspects. It was also revealed that the environmental parameters need to be taken into account over economic aspect, since in many cases they vary much between the alternatives considered. The selection of the structural frame material has greater influence than the other two component categories, and the inner components need to be considered rather than the surface components, even though they are not visible when a building is completed. This paper indicates the importance of expressing and understanding the diversity of the materials. It would be important for sustainable building design to select suitable materials according to the purpose and their features on a case-by-case basis. In order to broaden the range of choice, the market system needs to be developed as well.

DOI： 10.1016/j.buildenv.2014.09.026

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

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

Comparability of life cycle assessment (LCA) results based on different background data has long been debated. This is one of the main issues in building LCAs since buildings are complex products, which require multiple material data for the assessment. The objective of this study was to investigate numerical and methodological differences in existing databases related to building LCAs. The five databases selected were compared in terms of greenhouse gas (GHG) emission values in the material production phase of the three reference buildings, two wooden buildings with different frame types and a precast concrete framed building.

The results demonstrated that the databases show similar trends in the assessment results and the same order of magnitude differences between the reference buildings are shown by all the databases. It was also revealed that the numerical differences between the databases are quite large at some points and the differences originate from multiple data elements. The findings indicate the importance of the number of data and a clear statement of the bases of the values for comparative assessment. It would be more realistic to develop a reporting and communication system for LCAs rather than trying to unify the methodologies among the databases. An optimization of open information is significant for further development of LCA databases.

DOI： 10.1016/j.buildenv.2014.04.025

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Taylor&Francis Online  

This study reports on a detailed investigation into the greenhouse gas emissions associated with the construction process of multistory wooden buildings relative to the other life cycle stages: the material production and operation stages. The results showed that the construction stage accounts for 20–30% of the initial embodied emissions and 6–10% of the total emission of the included life cycle stages. Especially the transport process of building components seems to have higher potential to mitigate the emissions than the actual construction work. In addition, the emissions from different construction systems were studied based on the reference buildings. Although definitive conclusion would be difficult to be drawn from this study alone due to the small sample size and the assumptions made, prefabrication work seems to be a more efficient construction method compared to on-site work for wooden buildings.

DOI： 10.1179/2042645314Y.0000000077

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

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

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

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

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

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

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

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

DOI： https://doi.org/10.3130/aijt.12.399

Total pages：110   Book type：Scholarly book

Total pages：88   Responsible for pages：18-31, 58-64   Book type：Scholarly book

Total pages：170   Responsible for pages：34-35, 46-47, 52-59, 78-84, 124-127, 138-141   Language：English Book type：Scholarly book

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長崎大学  

Event date： 2016.8

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

Venue：University of Vienna, Austria  

Event date： 2016.8

Language：English   Presentation type：Oral presentation (general)  

Venue：University of Vienna, Austria  

Event date： 2016.6

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

Venue：Aalto University, Finland  

Thanks to the developments of practical solutions for low energy buildings, such as high level thermal insulation performance and air tightness of building envelopes as well as efficient building service systems, it became feasible to build zero operational energy building in any climate conditions. As a results of such efforts, the relative importance of energy consumption and associated impacts in other life cycle phases (e.g. material production and construction) is nowadays increasing. A life cycle perspective is thus significant for comprehensive building analysis and further development of environmental building solutions.
With this background, this presentation discusses possible means for beyond nZEB focusing on building materials, which are one of the essential elements of buildings. The influence of material selection on the life cycle energy balance and environmental impact of a building will be demonstrated based on current building codes and common building service systems in Finland. Furthermore, practical application of research findings will be introduced through a case study house built in Japan.

Event date： 2015.10

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

Venue：Hokkaido University  

Event date： 2014.11

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

Venue：University of Lapland  

Event date： 2014.10

Language：English   Presentation type：Poster presentation  

Venue：Barcelona, Spain  

Event date： 2013.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Graz University of Technology  

Event date： 2013.6

Language：English   Presentation type：Oral presentation (general)  

Venue：CESB13 Prague secretariat Terézia Němcová Faculty of Mechanical Engineering Czech Technical University in Prague  

Event date： 2013.5

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

Venue：Kouvola, Finland  

Event date： 2012.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Hofburg Vienna, Botschafterstiege, Vienna  

Event date： 2012.9

Language：English   Presentation type：Poster presentation  

Venue：Fernando Pessoa University, Porto  

Event date： 2012.7

Language：English   Presentation type：Poster presentation  

Venue：La Cité Nantes Events Center, Nante  

Event date： 2004.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：国立オリンピック記念青少年総合センター  

Event date： 2004.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長崎総合科学大学  

Work type：Architectural work   Location：Home-For-All and Beyond, LIXIL Publication Inc.  

Work type：Architectural work   Location：九州建築選2016　第10回建築九州賞（作品賞）29選  

Work type：Architectural work   Location：Puulehti - Finnish Wooden Architecture and Wooden Construction Magazine  

Work type：Architectural work  

Work type：Architectural work   Location：Puulehti - Finnish Wooden Architecture and Wooden Construction Magazine  

Work type：Architectural work  

Work type：Architectural work  

Work type：Architectural work  

Work type：Architectural work  

Work type：Architectural work  

Award type：International academic award (Japan or overseas)  Country：Japan

Country：Japan

Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

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