• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.37 no.3
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• pp.337-344
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• 2024

This work focuses on improving the light-harvesting efficiency of thin-film silicon solar cells through innovative multi-architecture surface modifications. To create a regular optical structure, a lithographic process was performed to form it on a glass substrate through various etching processes, from Etch-1 to Etch-3. AZO was deposited on top of the structures and re-etched to create a multi-architectural surface. These surface-modified structures improved the light absorption and overall performance of the solar cell through changes in optical and physical properties, which we will analyze. In addition, we investigated the effect of post-cleaning on the etched glass structures through EDX analysis to understand the mechanism of the etching action. The results of this study are expected to provide important guidelines for the design and fabrication of solar cells and other photovoltaic devices.

• Journal of architectural history
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• v.12 no.3
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• pp.117-130
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• 2003

Transparency orginated from a visual character of the object recognized to the backside without any obstacle is used as a word explaining the variety of an architectural character from the pre-mordern architecture. Transparency is expressed clearly without using of the material with a permeability like glass in the Korean traditional architecture. Thus the purpose of this study is to analyze an expression of the perceptive transparency focusing on the Dodong Seowon with the phenomenal transparency. In chapter one, the background, purpose and method of study are explained. In chapter two, general concept of transparency is inquired. In the process of searching for the formation of basic background, the characteristic of phenomenal transparency is recognized. In chapter three, the aspect of phenomenal tranparency expression in Korean traditional architecture is inquired. In chapter four, with the characteristics drawn from chapter three, the characteristics of Dodong-Seowon under its phenomenal tranparency are shown. In chapter five, synthetic conclusion is presented.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2002.04a
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• pp.88-89
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• 2002

The aims of this study is to realize the structural design for development of a medium scale E-glass/epoxy composite wind turbine blade for a 750KW class horizontal axis wind turbine system. In this study, the various load cases specified by the IEC61400-1 international specification and GL Regulations for the wind energy conversion system were considered, and a specific composite structure configuration which can effectively endure various loads such as aerodynamic and centrifugal loads, loads due to accumulation of ice, hygro-thermal and mechanical loads was proposed. In order to evaluate the structure, the structural analysis for the composite wind turbine blade were peformed using tile finite element method(FEM). In the structural design, the acceptable blade structural configuration was determined through the parametric studies, and the most dominant design parameters were confirmed. In the stress analysis using the FEM, it was confirmed that the blade structure was safe and stable in any various load cases Moreover the safety of the blade root joint with insert bolts, newly devised in this study, was checked against the design fond and the fatigue.

• Journal of architectural history
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• v.9 no.3 s.24
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• pp.51-69
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• 2000

This study tries to analyze the development of architectural technologies appeared in several tall buildings and large spatial structures from 1955 to 1999 in Korea. We suppose that these buildings represent the development of technology in Korean modern architecture. By the detailed analysis of these buildings, we can arrive at a conclusion as such; During the years 1955-1999, there existed a great changement in the eighties. We can find this fact very well in the domain of structural system and curtain wall system. In large spatial structures, the structural-system of shell and steel truss dome was replaced by that of space frame, space truss and cable truss with membrane. In tall building, the structural system of rigid frame and shear wall was replaced by tubular system, core and outrigger system. Korean architects introduced the aluminum curtain wall in the sixties, but its low technological level caused many problems in reality. Therefore, precast concrete curtain wall appeared from seventies as the main method for an outer wall in tall building. With the augmentation of height after 1980, PC curtain wall was replaced by the aluminum curtain wall of unit type and structural glass wall system. These systems help to stress the transparency in a tall building.

• Journal of the Korean housing association
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• v.13 no.4
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• pp.19-26
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• 2002

Despite its relatively small size, at least compared to other architectural programs, the house figures large in the cultural imagination. Closely identified with the individual and nuclear family, it has been frequently considered as an expression of widely held, even universal, values. Conversely, the private house has also been emblematic of more subjective desires, that change not only from person to person but from generation to generation. Certain conclusions can be drawn about the status of the private house at the end of the century, both as cultural invention and as a product of the autonomous discipline of architecture. The contemporary loftlike living space is similarly associated with work, given its emergence as an alternative home for individuals wanting space in which to live and work. In the case of what might be called the "un-private house", it is ofen a digital presence and the change of family system. This study was conducted to define the un-private house through public/private. The architectural characteristics of un-private house are as follows; 1) Alternatives- large open space with multiple function and collective free plan 2) Dematerialization- steel and glass with visual openness and ambiguity 3) Digital & Interfaces- fold and screen using technology and program. Especially, the un-private house is designed to provide individuals with emotional, superficial, and synergistic space, focusing on the personal life-style.

• Journal of Korean Association for Spatial Structures
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• v.20 no.1
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• pp.61-67
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• 2020

In the era of the Fourth Industrial Revolution, Various attempts are being made to converge new industries with IT industry to find new growth engines in the field of IT, maximizing efficiency in terms of productivity. 3D printers are also related to this, and various studies have been conducted worldwide to utilize them in the construction industry. At present, there is an active effort to study atypical structures using 3D printers. The most widely used method is the use of glass panels, however, the additional cost of the manufacturing process and thus the overall project cost cannot be ignored. In addition, the construction of the curvature of the existing two-way curved surface in the conventional flat joint method is not suitable for implementing an amorphous shape. In this paper, we propose an optimized shape through Abaqus analysis of various shapes of Space Truss interior using 3D printing technology using polymer.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.5
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• pp.149-156
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• 2013

The performances of solar collectors with single and double evacuated tube were experimentally compared. The solar collector with single evacuated tube using surface treatment in this study consists of radiation fin, heat pipe, absorber plate, glass tube, cap and regulating valve, and so on. Surface treatment was conducted for heat pipe and absorber plate with black chrome plating and copper black coating. As the results, the performance of solar collector with single evacuated tube using surface treatment showed good results compared that of double evacuated tube. Absorber plate played a positive role in performance and showed increase of about 28%. Further performance depends on vacuum degree and vacuum degree has to be considered economical efficiency in solar collector.

• 한국태양에너지학회:학술대회논문집
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• 2012.03a
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• pp.549-552
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• 2012

Recently the world is trying to reduce carbon emissions for global warming. Reducing use of fossil fuels can decrease carbon emission. In this reason the construction field has tried to reduce the use of fossil fuels relating to heating and cooling of buildings. An energy loss through the window system is about 10 to 30 percent of energy consumption of the whole building. The use of window film insulation is increasing to control the heat loss at the windows. The window film insulation absorbs solar radiation and makes the surface temperature of windows high. In this study, window surface temperature is measured, and an impact on indoor air is identified after attaching window film insulation. Finally, we found that cooling load decreases through simulation.

• Journal of architectural history
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• v.13 no.4 s.40
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• pp.75-88
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• 2004

The German Werkbund, which was founded in 1907, played an important role in the history of modern architecture. Its exhibition 1914 in Cologne is estimated as a meaningful event in the development of modern architecture. Especially two examples, among which were built at that time, are worthy of notice. The one is the 'Modelfactory' by Walter Gropius and the other 'Glashaus' by Bruno Taut. Generally in the Textbook on the history of modern architecture, the Taut's Glashaus is rarely mentioned or described as a early example of some expressionistic architecture, while the Modelfactory by Gropius is regarded as an essential workpiece in the early stage of modern movement. the time of searching alternative not only from rationalistic modernism but also postmodernism and today in the time of plurality, Taut's Glashaus could bring us more interesting and meaningful aspects in architectural design. Through investigating the background in the planning stage and analysing the composition of space, construction, circulation etc. it is to try to understand the building as really as what it was. Furthermore, historical meanings of the building in the modern architecture is reinterpreted in the following aspects; what should be reflected in architecture and how could 'Zeitgeist' be architecturally adopted?

• Journal of the Korean Solar Energy Society
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• v.29 no.1
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• pp.1-10
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• 2009

This study was carried out to evaluate the Life Cycle Cost(LCC) of three types of RTPV(Building Integrated Photovoltaic) systems-Glass plus Granite. Crystalline BIPV and See through Amorphous BIPV-which were vertically installed to generate the same power output(76 kW level). Initial investment costs. cost. savings and maintenance costs had been predicted during the period of analysing the LCC of three types of BIPV(Building Integrated Photovoltaic) systems installed for the purpose of evaluating the LCC. In case of cost savings, it had been analyzed by measuring the amount of electric power generated, reduction in lighting load and heat & cooling loads through simulation. From this analysis, it was predicted that the See-through amorphous BIPV offering cost saving advantages demonstrated the economical efficiency similar to the Class plus Granite when it is backed by more than 20 years of durability.