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채수빈,이석언,김수경,박근수,이운한,김진수,구현진 한국섬유공학회 2024 한국섬유공학회지 Vol.61 No.1
PP (polypropylene), which was previously used for general purposes, has a chemical structure that is difficult to decompose and has become a cause of environmental pollution. Therefore, a composite material was manufactured by adding TPS (thermoplastic starch), which can be biodegraded under composting conditions. The manufactured composite material was UV (photo oxidized) treated with cycle C according to the ASTM D 6954 standard for composite biodegradation. In the case of the UV-treated composite material, the molecular weight was reduced by 98.1% due to photo oxidation, and the melting peak was shifted to 132 oC and 43.6%. % melting enthalpy decreased. As a result of the analysis, it was confirmed that defects occurred in the composite material and polymer chains were broken due to photo-oxidation. The composting biodegradability test was conducted in accordance with ISO 14855-1, and after 180 days, the decomposition rate was 53.1% for TPS-PP composite material and 8.9% for UV-TPS-PP composite material, which is due to the photo oxidation process in the case of UV-TPS-PP composite material. It is judged that the degree of decomposition of gelation is low. Through continued research, it is judged that additional research is needed on how gelation occurs in PP due to photo-oxidation caused by UV treatment.
채수빈(Chae, Su Bin),양승현(Yang, Seung Hyeon),김재환(Kim, Jae Hwan),홍성욱(Hong, Seong Uk) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
이 연구는 지진에 취약한 조적조 건축물의 내진보강방안을 마련하고자 고인성복합체를 활용한 내진 보강공법을 개발하는 것이 목적이다. 고인성복합체로 보강한 조적실험체와 비보강 조적실험체를 제작하고, 보강 효과를 비교하기 위하여 휨 강도 시험을 수행하였다. 조적조 건축물의 내진보강 방안으로 고인성복합체를 활용할 경우 내진보강에 도움이 될 것으로 판단된다. The purpose of this study is to develop a seismic reinforcement method using a engineered cementitious composite in order to prepare a seismic reinforcement plan for masonry that are vulnerable to earthquakes. A masonry specimen reinforced with engineered cementitious composites and a unreinforced masonry specimen were fabricated, and a flexural strength test was performed to compare the reinforcement effect. If a engineered cementitious composite is used as a seismic reinforcement method for masonry, it is judged that it will be helpful for earthquake resistance reinforcement.
채수빈 ( Su-bin Chae ),정광필 ( Gwang-pil Jung ) 한국센서학회 2021 센서학회지 Vol.30 No.2
In this paper, a folding sensor based on capacitance is proposed. The sensor was developed to sense the length and angle data for the milli-scale actuators without causing any interference to the actuating joints. For the sensing and testing the robotic joint with reducing the cost and complexity aspects of manufacturing, a simple composition was adopted. The sensor comprises a pair of copper tapes, papers, and wires. The complete sensing unit is constructed by bonding the tapes with the papers and soldering the wire to the copper parts. For accuracy, a teensy 4.0 board, which has a 12-bit ADC resolution, is employed. Furthermore, the sensed analog data is not translated into the unit of capacitance for accuracy; however, it is filtered using a low-pass filter and subsequently, a Butter-worth filter. The data obtained demonstrate a periodic waveform, which implies that the data are in good agreement with the hypothesis set prior to the experiments. Compared to other milli-scale sensors, this could be a better option for sensing the length and angle data for milli-scale actuators.
기하학적 형태측정법을 이용한 영산강 마한 일상토기 생산체계에 대한 예비적 고찰: 심발을 중심으로
허진아,채수빈,유영석,송원근,박형후 한국고고학회 2022 한국고고학보 Vol.- No.125
The purpose of this paper is to supplement the ‘self-sufficient earthenware production theory’ of the Proto-Three Kingdoms period and to enhance the understanding of the daily earthenware production system in Mahan, Yeongsan River region. Considering the characteristics of Mahan society, in which a large number of communities or polities co-existed, the production organization and level of specialization were identified for simbal(‘deep bowl’) ware, a representative daily earthenware. First, the discussion on household economy and production specialization was reviewed, and provisional hypotheses were established based on this, and then verified through standardization analysis at local and settlement levels, respectively. In order to guarantee the objectivity of standardization analysis as much as possible, scientific analysis methods such as Geometric Morphometrics(GM) was used. The results of the analysis indicate that in the Mahan society of the Yeongsan River region in the Proto-Three Kingdoms to Three Kingdoms period, simbal ware was professionally produced in specific households and workshops in several villages in the local area, and then shared within the community; that is, ‘product specialization’ was achieved. In addition, it could be observed that Type B simbal ware is more clearly differentiated at the local level than Type A simbal ware, which preceded it. On the other hand, in areas such as Gwangju where urbanism had been developing since the Proto-Three Kingdoms period, it appears that the spread and diffusion of manufacturing technology or the exchange and distribution of products was actively carried out among the villages where exchanges were frequent due to the development of specialization and exchange networks. The fact that similarity between settlements can be confirmed for the forms of Type A simbal ware, which had been popular prior to the 4th century, indicates that the possibility that the Gwangju area had been a place of ‘production specialization’ since the Proto-Three Kingdoms period should be considered.