The present paper deals with the thermal buckling characteristics of symmetrically laminated plates. First, the effect of laminate configuration on the thermal buckling characteristics is investigated for symmetrically laminated plates. To examine the effect of laminate configuration, the thermal buckling characteristics are represented on the lamination parameter plane, where the stiffness and thermoelastic invariants are temperature-dependent in this paper. Next, the optimal laminate configurations for the symmetrically laminated plates with maximal buckling temperature are determined by using Nelder-Mead down-hill simplex method in which lamination parameters are used as intermediate design variables. The relation between the laminate configurations and the thermal buckling characteristics is discussed based on the concept of lamination parameters, instead of ply fiber orientation angles and ply thicknesses.

This paper describes a morphogenetic model framework designed to enhance the novelty and diversity of shapes. The model achieves this by controlling surface elements of shapes to create a wide variety of forms. The framework includes a morphological element model that encompasses various geometrical elements, along with their control methods. Additionally, local and global rules are incorporated to facilitate morphological generation, employing both the morphological element model and the concept of emergence. As an application example of the model, we demonstrate its use in generating morphology through triangular mesh control.

The frequency of extreme weather and large-scale disasters around the world are increasing caused by climate change. Climate change adaptation is a way to adapt to future climate change, but due to the difficulty of predicting the future affection in long-term, it is limited to proposing extensions of existing approaches, and few novel and effective approaches have been proposed. Idea generation methods are considered effective for such problems, but most methods are not effective when the problem setting itself is ambiguous. In this study, we tried to experiment with design fiction for idea generation for climate change adaptation measures.

In recent years, the importance of the sensory value has been increasing due to the growing demand for spiritual fulfillment. In line with this trend, the sensory value has become more important than functional value in product development. Although the sensory value has been emphasized in product development, it is difficult to quantify the sensory value and has not yet been formulated. One of the sensory values of a product is an aesthetic preference for its appearance, and appearance evaluation is an important process in product development. Although efforts have been made to quantify the sensibility value of appearance evaluation using simulation, most of them are based on images, and it is still difficult to quantify the sensory value using videos. Therefore, this study focuses on the optical data and aesthetic preferences obtained from simulations and aims to quantify the aesthetic preferences using image features of videos. First, image features of videos and images are investigated and classified. Next, we propose an index for quantifying aesthetic preferences using the classified image features. Finally, we apply the proposed index to diamond videos and examine its applicability.

This article describes comprehensively on elements of cellular automata implementation, which the author reported in past papers^{(1)(2)(3)(4)(5)(6)(7)(8)(9)}. First, concept and goal of the research are briefly reviewed in the chapter 2. Then specific algorithmic details of the implementation and their purposes are argued in the succeeding chapter; Essences of SLSF(Single-Layer, Single-Frame) scheme, SLMF(Single-Layer, Multiple-Frame) scheme, MLSF(Multiple-Layer, Single-Frame) scheme and MLMF(Multiple-Layer, Multiple-Frame) are posed. Further, computational results from SLSF and MLMF are compared along with FEM results in the chapter 4. Finally, remaining important algorithmic element, traction-free boundary, is explained briefly.

Vibration and noise reduction are important technology both industrially and environmentally to realize comfort industrial products with safe structures. In this paper, we carry out for numerical simulation of damped vibration for structures having a porous layer sandwiched by double walls. The cover plate in double walls has two Krylov type acoustic black holes. All edges around the walls, have free boundaries. Damping materials are on the surface of the black holes. Numerical analysis is performed to clarify changes of vibration transmission from the base plate to the cover plate due to the multiple acoustic black hole using FEM and MSKE method proposed by Yamaguchi et al.

On the basis of mathematical functions or numerical algorithms, we can generate various geometrical shapes in terms of a relatively limited number of parameters. This is the basic idea of so-called algorithmic design. In the current study, a general formulation of the approach is proposed. We introduce an idea of shaping function that is formally independent of specific designs. The proposed approach is considered to have the generality to be applicable to structure design problems of different types. An optimal design approach based on the shaping function is also proposed. Example designs of truss structure are conduncted; the feasibility and applicability of the proposed approach are discussed.

Light simultaneously induces visual and non-visual effects. Although the differences in the spectral sensitivity of intrinsic photosensitive retinal ganglion cells induce opposing influences on physiological responses, it is difficult to independently measure only non-visual effects. Therefore, the reported effects of light color on physiological responses are inconsistent. This study aimed to clarify the visual and non-visual effects of light color on sensory evaluation and physiological responses. A lighting environment in which light colors were difficult to perceive was constructed due to chromatic adaptation and change blindness. Brain activity and sensory evaluation of 21 participants were measured with and without light color perception. The results suggested that blue and red light reduced sleepiness more than white light, regardless of light color perception. A mean comparison suggested that blue light causes more non-visual effects compared to red light as blue light induces brain activation in some regions of the PFC (p < 0.05). Another mean comparison suggested that the visual effects of red light tended to enhance sweating, but the differences were not statistically significant.

The preference set-based design method can ensure robustness to the designer's intentions and performance requirements by providing a range of design solutions. However, most of the sensory qualities that are important in recent product design are based on qualitative data, and this method, which assumes quantitative data, is not applicable. In this study, we propose a preference set-based design method that can be applied to both qualitative and quantitative data using rough sets theory, which allows for the derivation of relationships between attributes with an inherent ordering. Additionally, we suggest its applicability through case studies.