Reusing abandoned public buildings is a positive strategy in sustainable urban development. An appropriate assessment method is needed to reduce the risks of redeveloping derelict public properties. The Delphi method is an optimal group decision-making technique; whereas the analytical hierarchy process (AHP) method is useful for solving multicriteria decision-making problems. In addition, fuzzy logic manages artificial uncertainty and ambiguity, where an explicit number or ratio can express the level of preference. This study uses the Delphi method, fuzzy logic, and AHP (DFAHP) as a risk assessment model to redevelop derelict public buildings. The DFAHP provides an objective reference for investment decisions and is beneficial in reducing the risk of the public sector investing in the reuse of abandoned public buildings, in aiding in reuse cases that revitalize urban economic development, and in appreciating the value of sustainable city development.

Abstract:The construction industry is a high-pollution and high-energy-consumption industry. Energy-saving designs for residential buildings not only reduce the energy consumed during construction, but also reduce long-term energy consumption in completed residential buildings. Because building design affects investment costs, designs are often influenced by investors' decisions. A set of appropriate decision-support tools for residential buildings are required to examine how building design influences corporations externally and internally. From the perspective of energy savings and environmental protection, we combined three methods to develop a unique model for evaluating the energy-saving design of residential buildings. Among these methods, the Delphi group decision-making method provides a co-design feature, the analytical hierarchy process (AHP) includes multi-criteria decision-making techniques, and fuzzy logic theory can simplify complex internal and external factors into easy-to-understand numbers or ratios that facilitate decisions. The results of this study show that incorporating solar building materials, double-skin facades, and green roof designs can effectively provide high energy-saving building designs.

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Construction industry has been criticized as the industry producing high pollution. Especially, a newly built house is often torn down and renovated the walls in the interior space at the life cycle stage of a housing project when buyers are using and maintaining, due to distinct customer demand and preference. Structural walls and beam columns are even randomly drilled for the piping requirement of air conditioner pipelines to result in public danger. It could be attributed to the regulation of interior environmental decoration without safety check in Taiwan and some interior designers, in order to strive for cases in the high competition, corresponding to customers' demands for changing interior patterns. In addition to newly built houses, the sale and transfer of second-hand houses is another thought for the renovation work of interior space environmental decoration to disturb the life of neighbors and seriously damage the environment. Accordingly, Delphi method, Analytical hierarchy process, and Utility theory are applied in this study to establish an AHP expected utility based evaluation model for management performance on interior environmental decoration, aiming to provide the safety management for interior environmental decoration and reduce the management review for energy consumption and environmental protection.

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