프리캐스트 콘크리트공법의 건설공기를 고려한 경제성 평가

홍성엽(Hong, Sung Yub),오세윤(Oh, Se Yoon) 한국콘크리트학회 2018 한국콘크리트학회 학술대회 논문집 Vol.30 No.2

A Study on the Application of Nano-material Focused on CNT and Graphene as Textile Fire Retardant

Hong, Sung Yeap(홍성엽) 한국전시산업융합연구원 2017 한국과학예술융합학회 Vol.31 No.-

One of the main reason of the disastrous fire is polymer which is used in livelihood. Because polymers are organic materials combined carbon, hydrogen and oxygen, polymers are vulnerable to heat. To decrease the disastrous polymers are necessary flame retardant which are additives not to burn by improving the inflammability of a polymer. The research method is as follows. Firstly, introduction of the fire retardant which are used in textile is variously used as not only household clothing but also all sorts of livelihood items. Development of fire retardant facilitates not only reinforcing fire retarding but also producing fabric with various functions such as sterilization, deodorization, and water repellent, so makes the use in the present restricted fields spread to new uses. Production of this multifunctional fabric facilitates combining existing fabric field with the field of engineering related to disaster prevention. Secondly, presentation of Kinds of fire retardants which are divided into addition fire retardant and responsive fire retardant. Addition fire retardant is a method mixing it simply by putting it as additive during compounding process, and responsive fire retardant gives fire retarding by producing a fire retarding polymer by introducing a monomer giving fire retarding to main chain of a polymer, or by combining fire retarding substance chemically in the end or side chain of a polymer by introducing reactive groups into a polymer. Thirdly, the introduction of nanocomposite fire retardants such as CNT or graphene fire retardants emerging from a limit of existing fire retardants reduces true character of fabric. Carbon nanotube CNT) is an allotrope of carbon with cylindroid nanostructure. Graphene is also one of carbon allotropes and has a structure that carbon atoms gather become 2D plane. Finally, CNT and graphene are overviewed as the promising materials for the flame retardant. The various results of CNT and graphene as nanofiller to retard the fire are mentioned. By the understanding of the retardation properties of those material, textile industry in the areas of clothing and household items will be more easily convergence with the nanotechnology.

강관 매입형 중공 프리캐스트 콘크리트 합성기둥 공법

홍성엽(Hong, Sung Yub) 한국콘크리트학회 2019 한국콘크리트학회 학술대회 논문집 Vol.31 No.2

A Study on Carbon Fiber Reinforced Plastic Focusing on the Automotive Applications

Hong, Sung Yeap(홍성엽) 한국전시산업융합연구원 2019 한국과학예술융합학회 Vol.37 No.5

Carbon fiber reinforced polymer (CFRP) is used in the various areas included automobiles. The matrix used in fiber reinforced polymer is the resin that interacts with the various elements of FRP and is generally classified into thermosetting polymers and thermoplastic polymers. Generally, thermosetting polymers were used a lot. Carbon fiber reinforced polymer is a high-strength, high-elastic material and lightweight material, which is used as a core material to manufacture for structural materials of cars. Productivity in the mass-production automotive industry should be significantly faster than the conventional composite material molding method. Carbon fiber reinforced thermoplastic polymer (CFRTP) and additive manufacturing may be alternatives as a material and molding method, respectively. CFRTP is a low-cost fabrication material that has received much attention in recent years due to its properties of high elastic modulus, high strength, and light weight. Additive manufacturing is expected to solve the costly traditional processes in that it can produce polymeric composite materials in an inexpensive and efficient manner. The research method is as follows. Firstly, this paper is an overview of the application of CFRP to automobiles. The recent technological achievements for the CFRP were review and reorganized to focus for the possible alternatives of CFRP. Various domestic and foreign electronic journals, such as Science Direct and Springer Link, were used to collect data, and the Internet and Internet sites of automobile companies to collect various data on the current state of the automobile industry. Secondly, the purpose of this article is to review and redefine the advantages and disadvantages of CFRPs, carbon fiber reinforced thermosetting polymer using thermosetting polymer and carbon fiber reinforced thermoplastic polymer using thermoplastic polymers, improvement direction of CFRP, process alternatives and others. Finally, this research proposes carbon fiber reinforced thermoplastic polymer (CFRTP) is acceptable alternate material to carbon fiber reinforced polymer and Additive manufacturing is possible technology to solve the costly traditional processes.

프리캐스트 콘크리트의 유형2 슬리브 기계적 이음 성능평가

홍성엽(Hong, Sung Yub),이창재(Lee, Chang Jae) 한국콘크리트학회 2020 한국콘크리트학회 학술대회 논문집 Vol.32 No.2

FEM 적용한 유닛 모듈러 골조의 기둥-보 접합부 해석

홍성엽(Hong Sung-Yub),박금성(Park Keum-Sung),이상섭(Lee Sang-Sup),허병욱(Heo Byung-Wok) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)

In this study, the comparison between calculated results obtained from the finite element analysis model and experimental results was conducted to understand the structural behavior of unit modular steel frame joint with the cold forming square-shape steel pipe pillar and light weight ㄷ-section steel beam. As results, it was investigated that the proposed analysis model can be performed very well for the nonlinear finite element analysis in that there was good agrement between calculated results and experimental results.

국내 프리캐스트 콘크리트 건축 시장현황 조사 연구

홍성엽(Hong, Sung Yub),오세윤(Oh, Se Yoon) 한국콘크리트학회 2018 한국콘크리트학회 학술대회 논문집 Vol.30 No.2

국내외 프리캐스트 콘크리트 산업 현황 및 기술수준 조사 연구

홍성엽(Hong, Sung Yub),이창재(Lee, Chang Jae),김만우(Kim, Man Woo),권순영(Kwon, Soon Young) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2

본 연구는 건축PC산업에 있어서 국내외 기술현황을 조사하고 상대적 기술적 위치를 분석하였다. 국내 PC산업은 발전기 단계에 해당하는 것으로 분석되었다. 건축PC산업이 가장 활성화된 일본 PC산업 대비 국내 특허건수가 20.5% 수준으로 다양한 기술분야에서 기술력 확보가 필요한 것으로 분석되었다. This study investigated the current condition of domestic and global technologies in the architectural PC industry. The domestic PC industry was analyzed to correspond to the generator stage. Compared to the Japanese PC industry, the number of domestic patents secured was 20.5%. It was analyzed that it was necessary to secure technical skills in various technology fields.

Analysis of Non-Universality of Golden Ratio Known as a Perfect Figurative Ratio

Hong, Sung Yeap(홍성엽),Lee, Cheol Ho(이철호) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.22 No.-

Golden ratio, defined as symbol φ (Phi) simply in the 20th century, was acknowledged as the most balanced beautiful ratio, so it has been used in architecture or pictures etc. Golden ratio is the significant figurative ratio deeply related to our actual lives but it is not explained why many people consider it cozy and stable even in today, technologically advanced. Some refutation that golden ratio is only mathematical theory but there are few cases to be applied to practice. First, it was examined that there are many cases to exaggerate a small number of coincidences with golden ratio by chance in spite of numerous ratios in the nature. Besides, there are many cases that proportions of rectangular objects such as name card, credit card or proportions such as HDTV and wide monitors etc are approximate values of golden ratio but it is hard to place under the category of golden ratio for there are big differences with golden ratio. Rather, it was confirmed that it is close to Geumgang ratio, Korean own figurative ratio. Geumgang ratio is also called harmonic proportion and has flexibility to fit well to the cultural atmosphere of modern society which respects diversity. In this point of view, it is considered the active promotion according to global age would be need on the basis of more in-depth study on Geumgang ratio, likewise examples of golden ratio in the Western world.

A Study of Ferrofluid as a Convergent Material with Arts and Music

Hong, Sung Yeap(홍성엽) 한국전시산업융합연구원 2018 한국과학예술융합학회 Vol.36 No.-

Nano science and nanotechnology has convergence with sports, music, and arts beyond convergence with other scientific technologies, and comes to develop into a totally new area. Ferrofluids feature the creation of the magnetic field induced shape on the ferrofluid surface, combination of drops, and magnetic microconvection. Because of its small particles size, a ferrofluid has been developed as a promising new nanomaterial the beginning. Ferrofluids are more applied to diverse areas, such as dynamic loudspeakers, computer hardware, dynamic sealing, and bioengineering because of their unique properties. The research method is as follows. Firstly, introduction of the background and scope of the study. The basic theories for ferrofluid science and examples of convergent work with ferrofluids are known and published. Secondly, the classification of magnetic fields are introduced. There are generally two type of magnetic fields which are magnetorheological fluids and ferrofluids. A ferrofluid is a colloidal suspension of magnetic particles with a very tiny size in a liquid carrier. A ferrofluid is different from MRF with regard to its fluidity even if subjected to strong magnetic fields. Thirdly, A key to the application of ferrofluids is colloidal stability. The stability is determined by the balance of multiple types of energy (attractive and repulsive forces) which are the factors to prevent separation for a given time after the disappearance of exterior magnetic fields and thermal energy. If average thermal energy exceeds a total of interaction, negligible agglutination arises. There are two types of ferrofluid which are water-based ionic fluid and organic media based ferrofluid. To use ferrofluid to convergent with arts or other areas, important factors are low viscosity, low vapor pressure and chemical inertness of carrier liquids and surfactants. Finally, There are many areas which convergent with ferrofluid to invent totally new work and to sell fantastical products which never meet before. Those areas are arts, music, sculpture, and commercial products. According to the development the nanotechnology, the convergence of ferrofluid with arts or other areas will be accelerate and develop further and intensively.