• 한국언론정보학보
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• 제82권
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• pp.73-103
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• 2017

이 연구는 메이커 운동과 관련된 단행본, 정책 보고서, 기사 및 칼럼 등을 비판적 담론 분석의 관점에서 살펴보며 메이커 문화를 둘러싼 담론적 지형과 사회적 실천을 분석한다. 정부 주도의 메이커 운동은 제작 문화를 경제 위기를 극복할 수 있는 '창조 경제'의 원동력으로 의미화하고, 디지털 제조업의 창업을 정책적으로 진흥하고 있다. 서울시의 경우, 정부 주도의 경제주의적 메이커 운동을 비판하면서, 기술을 통해 사회 문제를 해결하고자 하는 '디지털 사회 혁신'으로 메이커 운동을 제도화한다. 문화 예술계에서는 메이커를 장인 노동이나 손노동과 같은 '창조적 장인'으로 간주한다. 또한 지배적인 기술 구조에 대한 대항으로서 '비판적 제작 활동'을 구축하고자 하는 저항의 움직임도 있다. 하지만 지배적 담론이 현실적인 차원에 미치는 권력 효과와, 대항적 담론 투쟁으로 인한 지배 구조의 균열을 섣불리 확신할 수 없다. 현재 진행 중인 메이커 운동은 지배적인 권력 구조와 접합되어 제작 문화를 사회적 경제적 가치로 이끌어 내고자 하는 담론 전략과, 이에 대한 문화적 기술 정치적 가능성을 중시하는 대안적인, 혹은 대항적인 의미화 실천이 경합하는 갈등과 투쟁의 장이다.

• 한국산학기술학회논문지
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• 제21권10호
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• pp.72-76
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• 2020

중앙정부에서는 대한민국의 균형발전을 위하여 국가균형발전특별회계를 운영하고 있으며, 이를 통하여 지역의 발전을 꾀하고 있다. 많은 지방정부에서는 자생적 자립을 위한 발판을 마련하고자 여러 가지 형태의 노력을 하고 있는데, 그 중 지역의 경제성장을 이끌 수 있는 지역거점 기관 조성 등이 있다. 따라서 충남은 2019년부터 2023년까지 190억원을 투자하여 도내에 소재하고 있는 금속소재관련 기업의 성장을 지원하기 위한 '충남 첨단금속소재 플랫폼 구축사업'을 추진하고 있다. 이에 본 연구에서는 충남에 구축되는 지역거점센터에 투입되는 비용을 바탕으로 지역경제에 미치는 효과를 분석하였다. 분석시 산업연관분석모형을 사용하였으며, 연차별 투입금액에 따른 효과를 세부적으로 분석하여 제시하였다. 구체적으로 생산유발효과, 부가가치유발효과, 취업유발효과를 제시함으로써 동 사업의 효과성을 제시하였다. 분석결과 생산유발효과는 322억 3천만원으로 나타났으며, 총 부가가치 유발효과는 138억 2천만원, 취업유발인원은 101명으로 나타났다. 이러한 분석결과들은 동 사업의 추진에 대한 타당한 근거로 사용될 수 있다. 특히 편익의 항목으로 사용될 수 있는 생산유발 및 부가가치유발효과가 투입대비 높게 나타났기 때문이다. 또한 취업유발효과를 이용하여 동 사업을 통한 신규일자리 창출 및 고용인원을 파악할 수 있다.

• 치위생과학회지
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• 제9권2호
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• pp.249-255
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• 2009

본 연구는 성인성 치주염 환자의 치은연하 치면세균막을 총 60개 치아에서 채취하여 F. nucleatum과 A. actinomycetemcomitans의 동정을 위해 세균배양법, single PCR법 및 mutliplex PCR법을 실시하였고, 세균 동정법간의 비교를 통해 다음과 같은 결과를 얻었다. 1. F. nucleatum과 A. actinomycetemcomitans의 동정을 위해 세균배양법, single PCR 및 multiplex PCR을 실시한 결과 F. nucleatum은 각각 12개(20.0%), 45개(75.0%), 43개(71.7%) 치아에서 양성반응을 보였지만, A. actinomycetemcomitans는 각각 0개(0.0%), 4개(6.7%), 1개(1.7%) 치아에서 양성반응이 나타났다. 2. F. nucleatum은 세균배양법에 비해 single PCR법 및 multiplex PCR법에서 높은 검출 빈도를 보여 좀 더 효율적인 세균 동정법으로 생각되었지만, 통계적으로는 유의한 차이가 없었다. 3. A. actinomycetemcomitans는 세균배양법에서 전혀 검출되지 않아 통계적으로 검정할 수 없었고, 세균 동정법간의 비교도 어려웠다. 4. F. nucleatum과 A. actinomycetemcomitans의 동정을 위한 single PCR법과 multiplex PCR법 간의 비교에서 두 세균 모두 검출 빈도에 있어서는 큰 차이를 보이지 않았지만, 통계적으로는 유의한 차이를 보였다.

• 한국과학예술포럼
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• 제19권
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• pp.405-415
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• 2015

최근에 중국의 경제적, 문화적 변화 속도는 빠르고 생활양식도 많이 바뀌었다. 따라서 중국인의 생활은 인간 근본적인 식(食), 의(衣), 주(住)에 대한 요구가 높아졌다. 이에 각각 기업들은 한계를 넘어 더 넓은 영토와 풍부한 인구, 자원으로 시장 성장의 잠재력이 높은 중국시장으로의 진출이 주목되고 있다. 한국은 20세기 60년대 이후 경제성장을 통하여 근대화에 접근하는 동시에 수많은 문제점도 같이 생겼다. 그 중 하나는 인구의 도시집중 현상이다. 이 현상으로 이야기되는 주택부족의 문제는 특히 심각하여 사회적 문제가 되어 있는 상황이다. 이러한 현실에서는 주거공간의 축소화는 필연적일 수 밖에 없으며 이 상황에 따라 주거공간의 효율적인 활용이 요구되고 있음은 당연한 것이다. 특히, 한정된 가족 공동 생활공간에서의 합리적이고 효율적으로 공간을 활용하는 것은 더욱 의미가 크다. 한국과 달리 중국 주방공간은 거의 폐쇄되고 그 한정된 공간에서 다양한 활동을 진행해야 하는 것은 더 심각하다. 사람들이 생활에 대한 요구가 높아지고 식생활을 즐기면서 더 많은 물건으로 주방공간을 채우고 있다. 이 상황에 따라 주방 공간을 추가해야하는 상황이지만 불합리적이고 획일적인 주방가구의 배치 및 아파트의 자투리를 활용한 주방계획으로 주방공간의 사용효율성이 떨어지고 거주자의 불만이 높아지고 있다. 따라서 본 연구는 중국식 주방가구디자인을 위한 기초연구로 중국 보편적인 중소형아파트의 식생활공간에 수납되어 있는 물품의 가짓수, 수납위치와 빈도를 조사·분석하여 중국 식문화에 나타나는 식행위(食行爲)과 중소형아파트의 주방 수납공간 특성을 찾아내서 그 사이의 관계성을 제시하고자 한다. 향후 본 연구는 합리적·효율인 수납방식을 제안할 수 있도록 기초자료가 되기를 바란다.

• Advances in environmental research
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• 제9권3호
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• pp.161-173
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• 2020

The removal of two dyes, namely Methylene Blue (MB) and Reactive Brillant Red (RR) from aqueous solution was investigated using magnetite iron coated pumice (MIP) composite in the Fenton-like oxidation process. A weight ratio of 2.5 g (with the molar ratio of Fe³⁺ to Fe²⁺ to be 2) (5%) of iron to the total pumice (50 g) was enabled during synthesis of catalyst. Surface composition and characteristics of the catalyst were assessed by SEM-EDX, FT-IR, Raman spectral analysis. The effect of the amount of pumice solely used or MIP, H₂O₂ concentration, pH and initial concentration of MB or RR dyes on Fenton-like process efficiency was investigated. EDAX spectrums of pumice and MIP showed that oxygen and silisium are the major elements. The Fe content of MIP increased to 2.24%. SEM, FT-IR and Raman spectrums confirmed the impregnation of Fe on pumice surface. The experimental results revealed that high removal rates of dyes could be obtained using MIP that demonstrated a higher stability for removal of MB dye. pH affected the removal efficiency of both dyes and the degradation of both dyes was sharply dropped when pH was increased above 4. The removal of dyes did not significantly change with increasing H₂O₂ concentration. Degradation rates of both MB and RR dyes increased 3.3 and 2.8 times with the use of MIP compared to pumice alone, respectively. Furthermore, MIP enabled a good removal efficiency at higher dye concentrations. It can be emphasized that MIP composite can be used in the heterogeneous Fenton-like systems considering the economic and easily separation aspects.

• Geomechanics and Engineering
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• 제13권1호
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• pp.43-61
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• 2017

The inverted T-type abutments are generally used in highway bridges constructed in Korea. This type of abutment is used because it has greater stability, with more pile foundations embedded in the bedrock, while simultaneously providing support for lateral earth pressure and vertical loads of superstructures. However, the cross section of inverted T-type abutments is large compared with the piers, which makes them more expensive. In addition, a differential settlement between the abutment and embankment, as well as the expansion joints, causes driving discomfort. This study evaluated the driving comfort of several types of abutments to improve driving comfort on the abutment. To achieve this objective, a traditional T-type abutment and three types of candidate abutments, namely, mechanically stabilized earth wall (MSEW) abutment supported by a shallow foundation (called "true MSEW abutment"), MSEW abutment supported by piles (called "mixed MSEW abutment"), and pile bent and integral abutment with MSEW (called "MIP abutment"), were selected to consider their design and economic feasibility. Finite element analysis was performed using the design section of the candidate abutments. Subsequently, the settlements of each candidate abutment, approach slabs, and paved surfaces of the bridges were reviewed. Finally, the driving comfort on each candidate abutment was evaluated using a vehicle dynamic simulation. The true MSEW abutment demonstrated the most excellent driving comfort. However, this abutment can cause problems with respect to serviceability and maintenance due to excessive settlements. After our overall review, we determined that the mixed MSEW and the MIP abutments are the most appropriate abutment types to improve driving comfort by taking the highway conditions in Korea into consideration.

• Geomechanics and Engineering
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• 제8권4호
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• pp.615-630
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• 2015

The use of helical anchors has been extensively beyond their traditional use in the electrical power industry in recent years. They are commonly used in more traditional civil engineering infrastructure applications so that the advantages of rapid installation and immediate loading capability. The majority of the research has been directed toward the tensile uplift behaviour of single anchors (only one plate) by far. However, anchors commonly have more than one plate. Moreover, no thorough numerical and experimental analyses have been performed to determine the ultimate pullout loads of multi-plate anchors. The understanding of behavior of these anchors is unsatisfactory and the existing design methods have shown to be largely inappropriate and inadequate for a framework adopted by engineers. So, a better understanding of helical anchor behavior will lead to increased confidence in design, a wider acceptance as a foundation alternative, and more economic and safer designs. The main aim of this research is to use numerical modeling techniques to better understand multi-plate helical anchor foundation behavior in soft clay soils. Experimental and numerical investigations into the uplift capacity of helical anchor in soft clay have been conducted in this study. A total of 6 laboratory tests were carried out using helical anchor plate with a diameter of 0.05 m. The results of physical and computational studies investigating the uplift response of helical anchors in soft clay show that maximum resistances depend on anchor embedment ratio and anchor spacing ratio S/D. Agreement between uplift capacities from laboratory tests and finite element modelling using PLAXIS is excellent for anchors up to embedment ratios of 6.

• 대한의용생체공학회:의공학회지
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• 제31권5호
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• pp.375-384
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• 2010

The purpose of this study is to determine whether there is a correlation between the segmental bio-impedance measurement with the frequency modulations and the life-style disease of obesity. An obesity is not simply the factor for estimating the life-style disease of obesity, but also the risk factor occurring. There are many methods (BMI, WHR, Waist, CT, DEXA, BIA, etc.) for measuring a degree of obesity; the bio-impedance measurement is more economic and more effective than others. The physical examination, the blood test, the medical imaging diagnosis and the bio-impedancemeasurementswithmultiple frequencies for each body parts have been conducted for 77 people. The estimated value has been calculated through a segmental bio-impedance model based on multi-frequency that was created to reflect the highest correlation by analyzing correlation with linear regression analysis method for the measured bio-impedance and the risk factors. Then we compared with the clinical diagnosis. In case of high level cholesterol, low HDL-C and high LDL-C for life-style disease, the sensitivity is 80~100%and the specificity is 83~100%. This study has shown conclusively that bio-impedance can be a possible predictor to analyze the disease risk rate of population and individual health maintenance. And also the multi-frequency segmental bio-impedance can be used as early predictor to estimate the life-style disease of obesity.

• Structural Monitoring and Maintenance
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• 제4권1호
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• pp.17-31
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• 2017

Since extensometers are used to determine the absolute deformation of foundation and abutments and all results are obtained in reference to the base rod, the accuracy of these results has been constantly a subject of debate. In this regard, locating and installing extensometers outside the range of effect zone is also another challenge. The main purpose of this paper is to investigate and modify extensometers results based on the mentioned issues. For this aim, the concrete RCC Zhaveh dam in Iran was selected as the case study. To study the results of extensometers installed in this dam, first, the 3DEC_DP 5.00 software was applied for numerical modeling. Parameters such as discontinuities, dead load and piezometric pressure in the interface of concrete and rock were considered. Next, using the results obtained from 6 extensometers in foundation and abutments and 4 clinometers in dam body, the numerical model was calibrated through back analysis method. The results indicate that the base rod is moved and is not recommended being used as the base point. In other words, because installation of base anchor outside the range of effect zone is not possible due to the operational and economic considerations, the obtained results are not accurate enough. The results indicate a considerable 2-3 mm displacement of the base rod (location of the base anchor) in reference to the real zero point location, which must be added to the base rod results.

• Advances in concrete construction
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• 제10권5호
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• pp.455-462
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• 2020

This study investigated the effect of horizontal casting joints on the mechanical properties and structural behavior of sustainable self-compacting reinforced concrete beams (SCRCB). The experimental research consisted of two stages. The first stage used four types of concrete mixtures which were produced to indicate the effects of cement replaced with cement waste at 0%, 5%, 10%, and 15% by weight of cement content on fresh concrete properties of self-compacting concrete (SCC) such as, passing ability, filling ability, and segregation resistance. In addition, mechanical properties such as compressive, tensile, and flexural strength were also studied. The second stage selected the best mixture from the first stage and studied the effect of horizontal casting joints on the structural behavior of sustainable SCRCBs. The effect of horizontal casting joints on the mechanical properties and structural behavior were at the 25%, 50%, 75%, and 100% of sample height. Load deflection, failure mode, and theoretical analysis were studied. Results indicated that the incorporation of replacement with cement waste by 5% to 10% led to economic and environmental advantages, and the results were acceptable for fresh and mechanical properties. The results indicated that delaying the time for casting the second layer and increasing the cement waste in concrete mixtures had a great effect on the mechanical properties of SCC. The ultimate load capacity of horizontal casting joints reinforced concrete beams slightly decreased compared with the control beam. The maximum deflection of casting joint beams with 75% of samples height is similar with the control beam. The experimental results of reinforced concrete beams were substantially acceptable with the theoretical results. The failure modes obtained the best forced casting joint on the structural behavior at 50% height of casting in the beam.