Daniel Sang-Hoon Lee

Royal Danish Academy, Schools of Architecture, Design and Conservation · School of Architecture

Rural houses in sub-Saharan Africa are typically hot and allow malaria mosquitoes inside. We assessed whether passive or active ventilation can reduce house entry of malaria mosquitoes and cool a bedroom at night in rural Gambia. Two identical experimental houses were used: one ventilated and one unventilated (control). We evaluated the impact of (...

Origami-based designs have been successfully adopted to solve engineering problems at different scales of application. This article proposes a method for designing origami tessellations composed of quadrilateral meshes and degree-4 vertices. Crease patterns are generated starting from base units to which are applied tailored generation functions. T...

Mechanical damage in oil paintings on canvas show up as cracks and loss of original paint. Several parameters can contribute to this type of degradation. These paintings have a complex layered structure, typically composed of minimum four or more hygroscopic materials, each of which has different (non-linear) material properties and geometrical com...

Morphing structures with simultaneous deployable and load-bearing characteristics have become the research hotspot due to their practicability. For morphing deployable structures with these requirements, geometrical incompatibility will occur due to the design or the additional loads during the transformation. In order to solve the problem effectiv...

Scissor structures can meet different performance goals by actively changing their geometric configurations. This paper focuses on the inverse design problem of planar scissor structures with end constraints to obtain various forms without changing the span. Two strategies are proposed, one based on adding hinges and the other based on telescopic r...

The paper investigates the design and kinematic behavior of a novel origami canopy. Arc Miura-ori patterns are introduced to display the curved surface configuration. The spans and curvatures of assembled Arc Miura-ori units are discussed with two vertex angle modes. Then a calculated method to determine geometry parameters with different constrain...

The current paper presents an investigation, which has its main objective in the verification of outdoor wind flow CFD simulation results (ANSYS R Fluent) with real environment measurements in urban setting. The details of the simulation set-up are discussed in the paper including the inlet boundary conditions, surface roughness parameters and the...

A new design of a radially retractable roof structure based on the concept of the suspen-dome is proposed in this paper. The radially foldable bar structure is strengthened by the lower cable-strut system to obtain a higher structural stiffness. Then the comparison of the static behavior between the retractable suspen-domes and their corresponding...

Origami‐based designs refer to the application of the ancient art of origami to solve engineering problems of different nature. Despite being implemented at dimensions that range from the nano to the meter scale, origami‐based designs are always defined by the laws that govern their geometrical properties at any scale. It is thus not surprising to...

In sub-Saharan Africa, cooler houses would increase the coverage of insecticide-treated bednets, the primary malaria control tool. We examined whether improved ventilation, using windows screened with netting, cools houses at night and reduces malaria mosquito house entry in The Gambia. Identical houses were constructed, with badly fitting doors th...

In this paper different scenarios for back protection of a canvas painting and their effect on the stability of the relative humidity behind the painting are tested. A painting on canvas, stretched on a wooden frame, was fitted with various styles of back protection and then exposed to a cycle of temperature variation at the back, with the front ex...

A painting on canvas, stretched on a wooden frame, was fitted with various styles of back protection and then exposed to a cycle of temperature variation at the back, with the front exposed to a constant room temperature. The painting was also exposed to a constant wall temperature and varying room temperature. The space between the canvas and the...

In this paper different scenarios for back protection of a canvas painting and their effect on the stability of the relative humidity behind the painting are tested. A painting on canvas, stretched on a wooden frame, was fitted with various styles of back protection and then exposed to a cycle of temperature variation at the back, with the front ex...

The rapidly decreasing natural resources and the global variation of the climate push us to find intelligent and efficient structural systems to provide more people with fewer resources. This paper proposed a kinematic cable-strut system to realize sustainable structures in responding to changing environmental conditions. At first, the concept of t...

This manuscript presents the experimental investigations on the seismic behavior of precast grouted sleeve column-to-foundation connections. Six full-scale specimens were constructed with varying longitudinal reinforcement ratios and stirrup ratios. Four specimens were precast with grouted sleeve connections. Two cast-in-place reference specimens w...

The focus of the current research is at developing a tool, which can provide more readily available information about the dynamic deformation behavior of the structure based on instantaneous average strain of each facet in the earlier design process. The aim is not to provide the most accurate strain as it requires greater resources, but to inform...

Within the context of nearly Zero-Energy Buildings, it is debated that the energy-centred notion of design, proposed by regulatory frames, needs to be combined with a further focus toward users' comfort and delight. Accordingly, the underlying theory of the research is that designers should take responsibility for understanding the heat flows throu...

The paper presents a research exploring the thermal mass effect of reinforced concrete beams with structurally optimised geometrical forms. Fully exposed concrete soffits in architectural contexts create more than just visual impacts on the indoor climate through their possible interferences with light, sound and thermal conditions. It is considere...

Often thermal mass applications of concrete floor/ceiling for indoor comfort have seen active developments around load shifting control strategies, in conjunction with direct/indirect thermal storage systems using hollow core concrete slabs. The main agenda was to increase the temperature difference between the cooled ceiling and the surrounding ai...

Copenhagen city central was digitally constructed and the CFD simulation was performed using ANSYS Fluent. The main variable was the total layer number of surrounding buildings around the target building under observation, and each layer is defined based on the fixed radial distances from the target building. The resultant wind pressure on the faça...

A measurement campaign was set up in Lausanne. The objective of this study is to define the importance of using local meteorological variables in the design of urban spaces and in the evaluation of building energy use. Urban simulation tools typically use average climatic data to calculate the convection coefficient, the building thermal balance an...

The current paper describes a spin-off investigation from the initially published international research project [1] [2] , which is looking into the design and development of single-meridian grid deployable structure. As a part of the collaborative international project between South Korea (Project Leader), Japan and Denmark, expandable bars of two...

The paper presents an experimental design project in collaboration with N55, a Danish group of artists, and architect Anne Romme to build an underwater habitat using a facetted plate shell structure. The egg-shape structure is constructed with 6mm welded steel plates; three plates meet in all vertices, and structurally this has the consequence that...

This paper presents a summary of some recent research into optimized structural forms for concrete beams and columns. The formwork was constructed using flexible woven fabrics. Fabric form-work has been shown to be very effective as formwork, being efficient in materials, improving the quality of the concrete and facilitating the production of comp...

Copyright © 2014 by the authors. Published by the International Association for Shell and Spatial Structures (IASS) with permission. Abstract The main interest of the paper is at the design and development of deployable dome structure. In a deployable system the constituting elements moves through different spatial positions. A deployable system ne...

The paper describes an ongoing project, a sustainable design of an agricultural building, part of an ecological meat production farm on the island of Glaenø in Denmark. It is a low-cost design using local skills and materials. The building is resource saving on every level; it also utilizes excess heat and sun energy. The paper presents the overall...

This paper presents the design and construction of a tensegrity lighting structure. The intention of the paper is to share an application of the novel structural system with special emphasis on aesthetical appearance. Thus, the paper highlights the realisation and the construction methods used to realise the architect’s specific design idea. Comput...

The paper presents a study investigating into a more effective design of connection joint for scissor-type deployable structure. In the wider context the study is to develop more efficient design solution of emergency evacuation shelter with greater mobility and re-useability. The current study concentrates on the aim to enhance the deployablility...