• Clinical and Experimental Pediatrics
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• v.45 no.4
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• pp.459-465
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• 2002

Purpose : The aim of this study was to evaluate the latest tendency of esophageal foreign body's extraction and to obtain a consensus from recent trends of indications and techniques of flexible endoscopy of esophageal FB in children. Methods : We retrospectively reviewed medical records of 127 cases with foreign bodies in esophagus at Dept. of Pediatrics and Otorhinolaryngology, Gyeongsang National University Hospital (GNUH) from Jun, 1987 to July, 2001. They were divided into two groups by the kinds of endoscopy : flexible endoscope(66 cases) or rigid endoscope(61 cases). Rigid endoscopy was performed under general anesthesia at Dept. of Otorhinolaryngology but flexible endoscopy was performed without general anesthesia or sedative drugs(midazolam or diazepam). Results : An annual number of cases of two groups were similar from 1991 to 1998. But from 1999, flexible endoscopy was performed actively. Asymptomatic cases were frequently observed in flexible endoscopy(28 cases/66 cases) but swallowing difficulties were frequently observed in the rigid endoscopy group(25 cases/61 cases). Other symptoms were vomiting, irritability, chest discomfort and abdominal pain. The total number of cases with underlying disease(esophageal stenosis, cerebral palsy) was 8. The total number of cases with complications (erosion, ulcer, bleeding, perforation) was 11. The above cases were not correlated between the two groups. In 55 cases(83.3%) of the flexible endoscopic group and 53 cases(86.8%) of the rigid endoscopic group, foreign bodies in the esophagus were removed within 24 hours. Conclusion : We could not find any benefit in rigid endoscopic technique. Flexible endoscopic FB removal can be performed safely and effectively in children by an experienced endoscopist.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.05a
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• pp.307-312
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• 1999

A piezoelectric flextentional sonar transducer has been simulated using a coupled FE-BEM. The dynamics of the sonar transducer is modelled in three dimensions and is analyzed with external electrical excitation conditions. Different results are available such as steady-state displacement modes, underwater directivity patterns. It is shown that the present barrel-stave sonar transducer of the piezoelectric material produces flextentional displacements which could be related with higher output power, lower quality factor and more omnidirectional beam pattern than other types of sonar transducers.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.05a
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• pp.39-40
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• 2015

유기 전자 소자는 높은 유연성을 가지고 있어 차세대 전자소자로 주목을 받고 있다. 이러한 유기 전자소자에 있어서 투명전극은 핵심소재 중의 하나인데, 유연성을 위하여 유연한 투명전극의 개발이 필수적으로 요구되고 있다. 본 연구에서는 저저항/고투과의 유연한 투명전극을 제작하기 위해 보조배선을 도입했고, 이 보조배선을 기판에 함몰시키는 구조의 배선함몰형 유연 전극 기판을 제작하였다. 본 전극은 $1{\Omega}/sqr.$의 면저항과 90%의 투과도를 가지고 있음을 확인했고, 이 전극을 활용해 유연 유기전자소자를 제작하여 ITO 기반의 소자와 유사한 효율을 가짐과 동시에 높은 유연성을 가짐을 확인하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.165-165
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• 2015

유연 폴리머 기판상에 광 투과 특성을 개선한 초박형 금속 필름 기반 투명전극 소재를 개발하였다. 본 유연 투명전극의 높은 광 투과성과 전도성으로부터 유연소자의 성능향상을 검증하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.10
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• pp.84-93
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• 2020

This study had two aims (1) to explore the trajectory of family functioning (flexibility and cohesion) in the mothers' perspective and classify it according to the development of their child, and (2) to examine the differences in children's self-esteem as well the internal and external behavioral problems based on the latent groups. A total of 1,348 mothers and their children who participated in the survey in 2013 through to 2017 were analyzed. The group was subdivided into low incremental, average incremental, average-above incremental, and high unchanged groups according to the flexibility, and into low incremental, average incremental, decremental, high incremental, and above-high unchanged groups in terms of cohesion. From 2015 to 2017, the self-esteem of elementary school-age children showed differences depending on the flexibility and cohesion of family functioning; children in the high-unchanged group of flexibility and the above-high unchanged group of cohesion showed high self-esteem. Behavior problems of early childhood and elementary school-age children varied according to the latent classes of flexibility and the cohesion of family functioning. Children in low incremental and average incremental groups of flexibility and low incremental, average incremental, and decremental groups of cohesion showed more internal and external behavioral problems. These findings suggest that family functioning has significant effects on the psychological aspects of children.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.8
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• pp.734-739
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• 2008

In this study, the nonlinear mechanical behavior of flexible textile composites was predicted by two-step analyses: micromechanics and mesomechanics. The effective material properties for fiber tows of flexible textile composite lamina were calculated in micromechanics, which were then used to calculate the effective tensile stress-strain curve of flexible textile composites in mesomechanics. A user defined material algorithm was developed and inserted in ABAQUS to account for the geometric non-linearity due to the large rotation and shear deformation of fiber tows in mesomechanics. It was found that the stress-strain behavior of flexible textile composites exhibited significant non-linearity. The effective tensile modulus agreed well with the test result.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.03a
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• pp.88-88
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• 2011

최근 소비자의 생활수준이 향상되면서 섬유제품에 대한 기술적인 요구가 증가하고 있는데 그 중에서도 기모제품을 응용한 원단에 대한 요구가 급격히 증가하고 있다. 특히 기모원단은 기모공정 후 원단에 존재하는 기모유연제를 처리하기 위해 정련공정을 거쳐야 하는데 대부분의 염색공장에서는 이를 무시한 채 염색을 하고 있다. 이 때문에 잔존하는 기모유연제에 의해 염색 불량을 발생하게 된다. 기모원단에서 정련공정을 생략할 수 있다면, 공정의 단축으로 인한 Cost 절감 효과뿐만 아니라 폐수 부하량도 감소하는 등 시장 및 환경적인 측면에서 동시에 경쟁력을 가질 수 있게 된다. 본 연구에서는 (주)한송인더스트리에서 생분해성을 가지는 환경친화형 기모유연제를 개발하여 이를 염색공정 중 함께 처리함으로써 전체 공정을 단축하고, 개발한 친환경 기모유연제가 염색성에 영향을 미치지 않는 것을 확인하였다. 또한 기존 유연제와 개발된 유연제를 염색공정에서 동일한 조건으로 처리 하였을 때, 기존 유연제 처리 시료는 표면의 불순물과 Oil의 잔존으로 흡습성이 떨어져 균염성 떨어졌고, 염색된 원단에서도 염색불량을 확인할 수 있었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2002.05a
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• pp.65-68
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• 2002

This study of concrete movement confronting a scope inspects the problems about the waterproofing method and leakage/repairement at present and research the mechanism with the variety of applying examples introducing adhesion and inflation using the flexible type of waterproofing and repairement and the substitution method developed with polymer resign composite. The polymer resign transmitted into adhesion or inflation materials under wet environment absorbs adjoining moisture, wraps impurities of concrete surface. get the waterproofing layer and concrete surface adhere toughly, reorganizes the impaired waterproofing layer and get over the detachment of it from concrete surface.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.11a
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• pp.79-83
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• 2005

In the reinforced concrete structure, Even if speak that water leakage occurrence is no problem to material, there is a lot of reasons construction factor, material damage by behavior structure, properties of matter change by years and water leakage part by environment condition. so, waterproofing technological consideration should be gone ahead. In this research, we will study about stick performance, concrete surface adhesive, damage and blow. we will check all things and test it. The stick expansion type complex of flexible material passed on result of standard. It is conducive to concrete of durability by waterproofing layer performance demobilitation technology on the water leakage structure for solution of problem and repair

• Journal of the Korean Society for Marine Environment & Energy
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• v.1 no.2
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• pp.27-39
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• 1998

The interaction of monochromatic incident waves with a horizontal flexible membrane is investigated in the context of two-dimensional linear hydro-elastic theory. First, analytic diffraction and radiation solutions for a submerged impermeable horizontal membrane are obtained. Second, the theoretical prediction was compared with a series of experiments conducted in a two-dimensional wave tank at Texas A&M University. The measured reflection and transmission coefficients reasonably follow the trend of predicted values. Using the developed computer program, the performance of surface-mounted or submerged horizontal membrane wave barriers is tested with various system parameters and wave characteristics. It is found that the properly designed horizontal flexible membrane can be an effective wave barrier.