Boris Iliev

Matching the most suitable material for furniture design in interiors is a challenging task for designers, as it requires them to perceive the material’s attributes. This issue leads to a quest to understand the designer’s approach to selecting materials for furniture in the design process. Considering the aesthetic, technical, and ecological advantages of wood, this research aims to understand the position of wood material through methodologies used in design studies. Given that wood has been utilized in buildings, interiors, and furniture for centuries, it raises the question of its relevance to the new generation of designers. To investigate this, students of design studies were tasked with creating a product utilizing the knowledge gained regarding the phases of product development and the latest findings related to material assignment procedures. Design process is one that continually incorporates new procedures driven by technological advancements. The innovative approach of Speculative and Critical Design (SCD) can enhance the perception of creative thought; however, a conventional approach provides a reliable foundation that encourages further exploration and adherence to the established phases of design. Material assignment techniques such as Product-Driven Design (PDD) and Material-Driven Design (MDD) also play a significant role in comprehending the material properties and methods of product material allocation. Gaining insight into both product development processes and material assignment techniques can illuminate the role of wood as a material within design studies, particularly among students. This research focuses on comparing the methodologies and assignment techniques derived from the existing literature and studies, centered around a project aimed at understanding the willingness of design students to utilize wood materials. Ultimately, it is disclosed that the students plan to utilize wood as their primary material, in conjunction with traditional methodological approaches, and in accordance with PDD, indicating their focus on the requirements of the product.

A person’s sense of comfort while sitting depends on numerous physical and psychological parameters. This study investigated the impact of different office chair seat and back designs on the user’s ability to assess differences in thermal comfort during office work tasks. Eighty-two healthy subjects assessed their thermal sensation, moisture perception, and thermal comfort on six chair models using questionnaire. The chairs varied in backrest design (mesh vs. PUR foam) and seat materials. Assessments were conducted in air-conditioned workplaces over three weeks. The results showed an overall neutral thermal sensation (mean rating of 4.12 on a seven-point scale), with warmth being more pronounced in the buttocks and thighs than in the back, alongside variations observed in seven of the fifteen indicators. The comfort of both the backrest and seat was crucial for overall thermal comfort, as was the perception of humidity among different chair models. The relationships between thermal sensation, humidity, and comfort differed by chair’s design. This study confirms the complexity of thermal comfort in seat and backrest design, highlighting the importance of localized thermal sensations in chairs, while demonstrating that application of subjective ratings can demonstrate differences between chairs. Future research should address methodological limitations, incorporate objective measurements, and explore seasonal variations and adaptive thermal comfort.

Proportions and canons of the human body have always been an area of research mainly through art, architecture, or construction, and today, they have a significant application in product design. Research confirms that body height in most cases corresponds to the canon (head–body ratio) of 7.5 to 8 head lengths. This paper investigates the ratio of the head length (HL) to the total body height (BH, stature) of kindergarten and school-aged children, aiming to define the children’s canon inspired by the idea of the harmonic circle theory and the biomechanical model. The data were collected from 1307 children (male 676, female 631) aged 2 to 16 years in the cities of Zagreb (Croatia), Sofia (Bulgaria), and Skopje (North Macedonia). A generalized ESD test (alpha-level 0.10) and Turkey’s 1977 test were used in order to detect outliers in distributions of heights and in the distribution of ratios. Statistical significance was set at 0.05, all p values were two-sided, and the MedCalc statistical tool (version 20.110) was used. The results confirm that canonical changes follow the historical research of artists throughout the centuries, but that they change according to contemporary secular trends in children’s growth and cover HL/BH canons from 5.59 and 5.72 (2-year-old girls and boys) to 7.50 and 7.60 (15-year-old boys and girls) depending on age and gender. HL/BH ratio was significantly higher among female examinees in all age groups where difference was significant (Student’s t test, p < 0.02). In conclusion, such a calculation based on the canon is important for interdisciplinary professions. Creating an anthropological–biomechanical model based on canons, instead of time-consuming measurement, could significantly simplify the long-term collection of anthropometric data used for designing children’s products. Future detailed research is proposed.

The mismatch the kindergarten furniture dimensions with the children's anthropometric, as well as the design of non-ergonomic kindergarten furniture, potentially affects inappropriate body positions, and thus potential low back pain when sitting in later human development. The aim of this study was to examine the anthropometric measurements of preschool children and compare them with the dimensions of the preschool chairs in kindergartens in North Macedonia, Bulgaria and Croatia, in order to perceive the current situation and suggest improving for kindergarten furniture design. 848 children in 27 kindergartens participated in the research. A total of 36 types of chairs was found and measured. Children's upper leg length, popliteal height, and hip width were measured and compared with the three main chair functional dimensions according to EN 1729-1:2015. The results point to the conclusion that the mismatch between preschool chairs and children's dimensions is significant in some children’s groups. Systematic measurements of preschool children at the beginning of the new school year are recommended, as well as matching their anthropometric dimensions with the furniture. Kindergarten chairs should be designed to support the children’s bodies while sitting to avoid potential back pains in future development.

The proper growth and development of children is conditioned by many factors. One of the most overlooked prerequisite is the proper posture of the body in a seated position, which could be disrupted by the incorrectly dimensioned chairs...