• 헤리티지:역사와 과학
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• 제53권1호
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• pp.34-51
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• 2020

성남 고등동 회곽묘는 한 지역에서 다른 시기에 제작된 6기의 회곽묘가 발굴되었으며, 회곽묘 조성에 사용된 삼물회의 다양한 제작 기법이 확인되었다. 삼물회의 제작 기법을 규명하기 위하여 고문헌 기록을 바탕으로 석회 원료와 제작 기법 및 배합 방법을 고찰하였다. 조선시대 고문헌에는 석회의 원료 중 저품위 석회석을 사용한 기록과 배합 재료로 황토와 백토, 기와 가루 등과 같은 석회의 강도를 향상시킬 수 있는 포졸란 물질 사용에 대한 기록이 남아있다. 또한 삼물회의 다양한 배합 방법이 기록되어 있어 이에 대한 재현 실험을 바탕으로 석회 원료, 배합 재료, 배합 비율에 따른 삼물회 제작 기법 분석이 요구되었다. 조선시대 전기에는 석회를 다방면으로 사용하였으나 공급이 적고 기술적인 미숙함으로 지속적인 문제가 발생하였으며, 조선시대 후기에 이르러 대량 생산됨과 함께 석회 제작 기술이 발달하였다. 16세기와 18세기 회곽묘 삼물회의 제작 기법 분석을 바탕으로 고문헌에 기록된 배합비와 배합 방법들이 적용된 것을 알 수 있었으며, 회곽묘 삼물회는 시기에 따라 석회의 품질이 변화하였고 배합 재료 또한 변화됨에 따라 배합 비율이 다르게 나타나는 것으로 판단된다. 회곽묘 삼물회의 배합 비율은 시기에 따라서 변화하였으며, 주례와 가례를 기준으로 정해진 배합 방법으로 제작되었기 때문에 회곽묘 삼물회의 제작 기법에 대한 과학적 분석 자료가 지속적으로 구축된다면 회곽묘 편년 연구에 도움이 될 것으로 기대된다.

• 산업경영시스템학회지
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• 제44권3호
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• pp.10-21
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• 2021

Recently, the demand for atypical structures with functions and sculptural beauty is increasing in the construction industry. Existing mold-based structure production methods have many advantages, but building complex atypical structures represents limitations due to the cost and technical characteristics. Production methods using molding are suitable for mass production systems, but production cost, construction period, construction cost, and environmental pollution can occur in small quantity batch production. The recent trend in the construction industry calls for new construction methods of customized small quantity batch production methods that can produce various types of sophisticated structures. In addition to the economic effects of developing related technologies of 3D Concrete Printers (3DCP), it can enhance national image through the image of future technology, the international status of the construction civil engineering industry, self-reliance, and technology export. Until now, 3DCP technology has been carried out in producing and utilizing residential houses, structures, etc., on land or manufacturing on land and installing them underwater. The final purpose of this research project is to produce marine structures by directly printing various marine structures underwater with 3DCP equipment. Compared to current underwater structure construction techniques, constructing structures directly underwater using 3DCP equipment has the following advantages: 1) cost reduction effects: 2) reduction of construct time, 3) ease of manufacturing amorphous underwater structures, 4) disaster prevention effects. The core element technology of the 3DCP equipment is to extrude the transferred composite materials at a constant quantitative speed and control the printing flow of the materials smoothly while printing the output. In this study, the extruding module of the 3DCP equipment operates underwater while developing an extruding module that can control the printing flow of the material while extruding it at a constant quantitative speed and minimizing the external force that can occur during underwater printing. The research on the development of 3DCP equipment for printing concrete structures underwater and the preliminary experiment of printing concrete structures using high viscosity low-flow concrete composite materials is explained.

• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1273-1279
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• 2016

Production of iodine-131 by neutron activation of tellurium in tellurium dioxide ($TeO_2$) material requires a target that meets the safety requirements. In a radiopharmaceutical production unit, a new lid for a can was designed, which permits tight sealing of the target by using tungsten inert gaswelding. The leakage rate of all prepared targets was assessed using a helium mass spectrometer. The accepted leakage rate is ${\leq}10^{-4}mbr.L/s$, according to the approved safety report related to iodine-131 production in the TRIGA Mark II research reactor (TRIGA: Training, Research, Isotopes, General Atomics). To confirm the resistance of the new design to the irradiation conditions in the TRIGA Mark II research reactor's central thimble, a study of heat effect on the sealed targets for 7 hours in an oven was conducted and the leakage rates were evaluated. The results show that the tightness of the targets is ensured up to $600^{\circ}C$ with the appearance of deformations on lids beyond $450^{\circ}C$. The study of heat transfer through the target was conducted by adopting a one-dimensional approximation, under consideration of the three transfer modes-convection, conduction, and radiation. The quantities of heat generated by gamma and neutron heating were calculated by a validated computational model for the neutronic simulation of the TRIGA Mark II research reactor using the Monte Carlo N-Particle transport code. Using the heat transfer equations according to the three modes of heat transfer, the thermal study of I-131 production by irradiation of the target in the central thimble showed that the temperatures of materials do not exceed the corresponding melting points. To validate this new design, several targets have been irradiated in the central thimble according to a preplanned irradiation program, going from4 hours of irradiation at a power level of 0.5MWup to 35 hours (7 h/d for 5 days a week) at 1.5MW. The results showthat the irradiated targets are tight because no iodine-131 was released in the atmosphere of the reactor building and in the reactor cooling water of the primary circuit.

• Advances in concrete construction
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• 제14권1호
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• pp.1-13
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• 2022

Due to the physical-chemical characteristics of some bottom ash (BA), there are technical, economic and environmental limitations to find a destination that will add value to it. In Brazil, this residue is eventually used for filling coal extraction pits or remains in sedimentation ponds, creating a susceptible panorama to environmental issues. The geopolymers binders are one of the alternatives to the proper use high amounts of these materials. In this work, geopolymeric binder pastes were produced with BA mixed to activators with different alkali contents (expressed as %Na₂O), as well as the incorporation of soluble silicates (Ms content). The production of binary geopolymeric pastes based on the use of two industrial wastes: fluid catalytic cracking (FCC) and aluminum anodizing sludge (AAS), was also assessed. The content in mass of BA/FCC and BA/AAS ranged from 100/0, 90/10; 80/20 and 70/30. Systems with soluble silicates as activator in a molar ratio SiO₂/Na₂O of 1.0 (Ms = 1.0) and Na₂O content of 15%, showed the best results of mechanical strength (42 MPa at day 28^th). The improvement is up to 5X when compared to NaOH based systems. For systems with partial replacement of BA of 10% of AAS and 20% of FCC (80/20), the presence of soluble silicates was also effective to increase compressive strength.

• 한국디지털건축인테리어학회논문집
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• 제12권3호
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• pp.91-100
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• 2012

This paper not only reviews recent trends and characteristics of welfare facilities, but also proposes main components such as building materials and furniture applying a traditional Korean house. This paper aims to utilize interior design and construction materials of unit-care welfare facility applying the traditional Korean house. Results are as follows. 1. The rate of the private bedroom as elderly welfare facilities is 63.1%; on the contrary, the rate of the 4-person bedroom is 63.2%. The expansion of the private bedroom is an urgent need in order to improve the quality of residences. 2. According to elderly services needs and revitalization for the traditional Korean house, it is required to implementation the unit-care facilities for the elderly and interior design for the traditional Korean house. 3. The interior design for the traditional Korean house is applied to elderly living space such as a bedroom and a living room; it is not applied to care space and management space such as a nurse station and an office occupied by employees. 4. There is no problem to construct space applying the traditional Korean house using interior products currently being sold in the domestic market. 5. Standardized mass production is essential to popularize the traditional Korean house style interior.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.24-25
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• 2011

Molecular self-assembly has several advantages over other nanofabrication methods. Molecular building blocks ensure ultrafine pattern precision, parallel structure formation allows for mass production and a variety of three-dimensional structures are available for fabricating complex structures. Nevertheless, the molecular interaction for self-assembly generally relies on weak forces such as van der Waals force, hydrogen bonding, or hydrophobic interaction. Due to the weak interaction, the structure formation is usually slow and the degree of ordering is low in a self-assembled structure. To promote self-assembly, directed assembly methods employing prepatterned substrates or external fields have been developed and gathered a great deal of technological attention as a next generation nanofabrication process. In this presentation a variety of directed assembly methods for soft nanomaterials including block copolymers, peptides and carbon nanomaterials will be introduced. Block copolymers are representative self-assembling materials extensively utilized in nanofabrication. In contrast to colloid assembly or anodized metal oxides, various shapes of nanostructures, including lines or interconnected networks, can be generated with a precise tunability over their shape and size. Applying prepatterned substrates$^{1,2}$ or introducing thickness modulation$^3$ to block copolymer thin films allowed for the control over the orientational and positional orderings of self-assembled structures. The nanofabrication processes for metals, semiconductors$^4$, carbon nanotubes$^{5,6}$, and graphene$^{6,7}$ templating block copolymer self-assembly will be presented.

• 한국산학기술학회논문지
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• 제18권11호
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• pp.731-739
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• 2017

오늘날 3D 프린팅 기술은 다품종 소량 생산 및 맞춤형 생산, 생산 비용 및 시간 절감의 가능성이 가시화되고 있으며, 그 활용 범위가 제조업분야에서 건축분야로 확장되고 있다. 최근 국외를 중심으로 3D 프린팅 기술을 이용한 건축물, 건축 부재 및 부품을 제작한 사례가 등장하고 있으며, 국내에서도 건축 설계 및 시공 기술과 3D 프린팅 재료 및 장비 등 제반 기반 기술 개발이 이루어지고 있다. 건축분야의 3D 프린팅 기술은 도입 초기 단계로 시제품 제작 수준이나, 향후 상용화 단계로 발전하기 위해서는 현 업계의 실정을 고려한 현실적이고 체계적인 도입 전략이 필요하다. 이에 본 연구는 국내 건축분야 3D 프린팅 기술이 상용화 단계로 도입하기 위한 기반 연구로서, 3D 프린팅 기술의 도입에 대한 실무자 인식에 대한 현황을 파악하고자 설계, 시공, 자재 및 3D 프린팅 전문가를 대상으로 설문조사 및 면담을 실시하였다. 인식 현황 분석 결과, 실무에서는 3D 프린팅 건설 기술이 일반 건설시장의 대체 형태보다는 비정형 건축물, 특수한 디자인 형태의 소형 건축물, 인테리어 시장 중심으로 상용화될 것으로 전망하고 있었다. 상용화가 기대되는 3D 프린팅 건축 상품은 부재 및 부품 단위 수준으로 제한적이며, 경제성과 기능성보다는 심미성이 상품 경쟁력의 가장 큰 요인으로 인식하고 있었다. 향후 시설물 단위의 상품으로 상용화 가능성을 높이기 위해서는 재료와 장비의 성능, 안정성 확보와 함께 건축에 특화된 공법 및 정책과 제도가 요구되는 것으로 파악되었다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.117-122
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• 2008

The apartment will be much more convenient than the other one in the application of green technologies, providing the merits by mass production. For example, pre-manufactured building materials can be effectively adapted to the formation of buildings. Recently, the form of double-enveloped window system has been developed for the purposed of minimizing energy loss occurred around windows. On the other hand, the expansion of balcony area was legalized and thus, a visual buffer area does not exist any more. All-glass window wall on apartment houses without a balcony produces pretty harmful area with direct sunbeam. A various types of glass can be applied to the window system and it plays a critical role in the determination of inner visual environment. For the purpose of verifying the potential of its daylighting, a mock-up model has been constructed and tested. The refurbished version of conventional window shows its illuminated characteristics. Clear and Low-e glass have been adapted for window area and daylighting ratio has been compared in both test cells.

• 한국가구학회지
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• 제24권2호
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• pp.148-155
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• 2013

Appear on the furniture design concept of the Joseon Dynasty Pung-hyel design was developed that is imaged by implication. Was enough of our culture, tradition and the wisdom of our ancestors to the development of a design that reflects the traits to fit the purpose of each form to proceed. Based building materials, technology, and how to identify and develop products as competitive PE fence, and at the same time to develop an international product design is based. Was designed with functionality and mass production to be faithful as a function fence productivity. Formative elements where you can rub shoulders with the modern urban environment alive excavated features leads in the traditional culture, aesthetics, design emphasized a new sense of harmony. Improvements were becoming increasingly aware that traditional culture of Korea's own traditional forms of social concern of modern design. Other products and take advantage of the traditional pattern, with figurative motifs and differentiation, and faithful to its original function as a fence brings out the basic elements of the visual motif has a distinctive beauty.

• 한국CDE학회논문집
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• 제13권4호
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• pp.273-285
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• 2008

In this paper we propose an engineering bill of materials (E-BOM) copy method that can be utilized to manage the product information for each equipment during building a product lifecycle management (PLM) system in the order-specific semiconductor equipment manufacturer. The previous works studied on an E-BOM creation and management method for the mass manufacturing and production. The method is difficult to apply to an environment in which many engineering changes occur and the different specification to each equipment is required such as semiconductor equipments and facilities adopting built-to-order instead of built for inventory. Moreover the method is known to be the major drawback to deteriorate the design efficiency. Our E-BOM copy method enables users efficiently to manage the specification of a product and shortens the product development cycle. To implement the E-BOM copy method in the PLM environment, we developed the E-BOM copy system that automatically generates new parts and their numbers according to the numbering rule while copying the E-BOM from existing semiconductor equipments and then can apply the parts for reuse to new semiconductor equipments. This system can duplicate not only 3D CAD data but also technical documents.