• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.2
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• pp.537-547
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• 2014

Parking infrastructure in university campuses has been inadequately developed in spite of rapid increase in car ownership of professors, staffs and students. However, only a few researches have been conducted domestically and overseas to identify and solve the problem. Thus, in this study owner drivers in 16 campuses located in Seoul Metropolitan Area were interviewed to figure out what they thought were important factors and how much they were satisfied when they were using parking lots in campuses. The questionnaires of the survey included economy, accessibility, convenience, punctuality, safety and informativeness. The Importance-Satisfaction Analysis was conducted based on the survey. And the parking characteristics of university campuses were compared based on the levels of importance and satisfaction calculated by ISA. Lastly, criteria of establishing campus parking management guideline were suggested as well.

• 기계와재료
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• v.23 no.3
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• pp.96-113
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• 2011

녹색기술 및 친환경 공정의 필요성이 급증함에 따라 재료이용률 향상을 지향하는 차세대 압출공정의 대두가 필요하게 됨에 따라 유압 CNC(Servo) 제어를 이용한 가변단면 압출기술을 개발하게 되었다. 이러한 가변단면 압출(Varied section extrusion, VSE)기술은 공정 중에 압출구를 빠져 나가는 소재의 단면 형상을 변화시켜 재료이용률을 향상을 도모하였으며, 후가공 공정의 생략도 가능하여 국내 압출업체의 생산원가 절감 및 글로벌 기술경쟁력 확보에 큰 도움을 줄 수 있을 것이다. 아직은 소수의 선진국에서 시도한바 있으나 양산품 적용에는 생산원가 및 생산속도, 상품성 등에 문제가 있어 자동차 부품 적용에 한계를 보이고 있는 기술이다. 따라서 본 연구팀이 가변단면 압출용 금형을 포함한 최적의 압출공정 및 양산성 문제의 해결점을 거의 확보하고 있는 단계로 세계를 선도하는 리딩기술(Leading technology)을 보유하게 됨으로써 국가의 기술경쟁력 향상에 중요한 역할을 수행할 수 있을 것이다. 본 연구의 내용을 요약하여 정리해 보면 첫째로는 CNC 제어 가변단면 압출공정에 대하여 자세하게 소개하고 특징 및 장 단점을 설명하였으며, 자동차 부품군에로의 적용에 많은 이점들을 갖고 있음을 설명하였다. 두 번째로는 가변단면 압출을 위한 이동 금형(Moving die)부품을 갖는 구조의 압출금형에 관하여 기존의 압출금형과 비교하여 설명하였으며, 가변단면 압출용 금형의 구조 및 메커니즘의 최적화를 이루고자 하였다. 세 번째로는 가변단면 압출공정을 실현하기 위한 CNC 제어 압출시스템에 대하여 간략히 설명하였다. 네 번째로는 자동차 부품 적용을 위한 정밀 압출공정으로서 가변단면 압출공정에 대하여 유한요소해석을 통하여 가변단면 압출공정 변수 및 금형 변수 등에 대한 엄격한 검토를 선행적으로 수행하여 양산성 확보를 위한 정보들을 분석 정리하였다. 끝으로는 세 가지 단면형태를 갖는 가변단면 압출제 시제품에 대하여 CNC 제어 가변 단면 압출공정의 상용화 가능성을 확인 적용성 검토를 완료하였다. CNC 제어 가변단면 압출기술은 압출공정에 있어서 많은 경험과 기술적 검토가 선행되어져야 하는 고부가가치 성형공정으로써 재료 이용률을 획기적으로 향상시킬 수 있는 압출공법으로 향후 자동차 부품 뿐만아니라 다양한 알루미늄 제품군에 적용이 가능하다고 판단된다.

• Applied Chemistry for Engineering
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• v.31 no.1
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• pp.25-29
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• 2020

In this study, a polymer/graphene hybrid composite was prepared by a simple roll-method and a simple sensor was produced by a convenient surface engineering procedure. The sensor performance was examined and the effect of graphene content on the sensing behavior was monitored. A polymer (polydimethylsiloxane, PDMS) paste containing graphene powder was prepared by a three-roll apparatus and polymer/graphene hybrid composite was produced by a two-roll technique. The sensing medium, cyclodextrin (CD) was introduced by a convenient bio-conjugation method. The efficacy of surface modification was confirmed by FT-IR spectroscopy and the ohmic relation was observed on composite surfaces. An analyte (e.g., methyl paraben, MePRB) at a 10 nM concnetration could be detected. When the graphene loading was low, the sensor performance was relatively poor. This was attributed to the absence of graphene alignments, which were observed for the composites having a high graphene loading. This indicates that the sensor performance was influenced by physical alignments of the filler. This article can provide important information for future research on developing sensing devices.

• Journal of Convergence for Information Technology
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• v.10 no.9
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• pp.183-190
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• 2020

The purpose of this study is to conduct computational thinking-based software education for a 5-year-old, and to analyze educational meanings. For the study, a total of 10 activities were applied for 50 children at two kindergartens located in Seoul and the collected data were analyzed qualitatively. As a result of the study, the educational meaning that founded to young children in software classes was finding problems in prior experiences, approaching the simulation process with stories, and feeling of interest and achievement through software devices. The educational meanings that founded to the teacher were to ask questions to support the procedural thinking process, to lead the thought process to concrete experiences, and to move between group activities and individual activities appropriately. In the future, research on the effectiveness of computational thinking-based software education should be conducted.

• Membrane Journal
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• v.27 no.3
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• pp.273-283
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• 2017

Polysulfone (PSF) is one of an important polymer that has been widely used in the manufacture of asymmetric microfiltration (MF) membranes. PSF membrane is considered as hydrophobic membrane that easily fouled during membrane operation process. The blending method is an effective method for improving the fouling resistance of PSF membranes. sPES (sulfonated polyethersulfone) is one of the useful polymers that can be used in PSF polymer blend method to improve hydrophilicity of PSF membranes. In this study, microfiltration polymer membranes were prepared by using PSF/sPES/PVP/BE/DMF casting solution and water coagulant. The morphology of MF membranes was changed by addition of a small amount of sPES in casting solution. The morphology of the sPES added membranes was changed into a highly asymmetric structure. The active layer grew and mean pore size was decreased by addition of sPES. However, the water flux of PSF/sPES/DMF/PVP/BE membrane was higher than that of PSF/DMF/PVP/BE membrane.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.27 no.3
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• pp.255-271
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• 2016

It's been taken a profound interest in the user eduction of the children's libraries, as they have taken the conveniences, resources, children's librarians after 2000. The purpose of this study is to consider whether the children's library can use the story-telling in library use education, to develop the instructional model based on the story-telling method for children, users in children's libraries. After all, it's reviewed to understand the concept and principle of story-telling method, to consider whether the method can be adopted to the user education in children's libraries, and to propose the instructional model based on the story-telling. The result of this study will give the good examples for the user education, especially the planning of user education in children's libraries and public libraries in Korea.

• Journal of the Korea Convergence Society
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• v.7 no.6
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• pp.219-228
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• 2016

This research was convergence study conducted to understand the effect that a recovery program for social capital has on empowerment and career preparation activity in female college students. The subjects were female college students located in K city, and Experimental Group 30, Control Group 30 questionnaires were used as the data for analysis. As a result of this study, it was discovered that there was a statistically significant difference in personally-internal, political and social areas in the sub-areas of empowerment in female college students while there was no significant difference in personal relationships. Also, in the sub-area of career preparation activity in female college students in the recovery program for social capital, information collection activity and practice activity were different and the differences were statistically significant. It is suggested that further studies are needed on recovery programs for social capital for improved empowerment, career preparation behavior and usability.

• Journal of Convergence for Information Technology
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• v.7 no.1
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• pp.43-48
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• 2017

The design trend is changed with the times. The design trend of recent 21 century is eco-friendly design. The optical illusion design is a new trend of digital convergence era. In this study, optical illusion patterns were designed for furniture with eco-friendly UV-curable resin. The micro-patterns of optical illusion design were fabricated with the micro-mold which was mastered using a semiconductor micro-fabrication process by photolithography technique. The micro-patterns of optical illusion design were manufactured on PET film with a roll-to-roll process using a UV-curable resin. The manufactured PET film of optical illusion micro-pattern exhibits hologram effect, optical illusion effect, and texture of metal with the backside digital printing of metal tone. The furniture of new design concept so-called emotional furniture was manufactured with the various optical illusion design patterns. The optical illusion design patterns by UV mold prospect a new trend of interior design materials.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8249-8261
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• 2015

The purpose of this study was to examine the effects of learning community on communication skills and self-directed learning(SDL) ability. Data were collected from 147 members at N university, they participated in learning community activities for 8 weeks. To verify program's effect, pre and post tests of communication skills and SDL ability were examined. The result were as follows. Learning community activities were positive influenced on the improvement of communication skills and SDL ability. Especially, it was effective on the improvement of interpretation ability that includes diverse information collection or listen to other's opinion. And it was effective on the improvement of learning plan ability. Learning plan includes that learning needs diagnosis, goal setting and grasp learning resources. We were suggested that student customized learning community development and activation for sustainable core competency improvement.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.169.1-169.1
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• 2015

최근 디스플레이 기술은 급속도로 발전해 가고 있다. 디스플레이 산업의 눈부신 성장에 발맞추어 초고화질, 초고선명, 고속 구동 및 대형화 등을 포함하는 최신 기술의 디스플레이 구동이 필요하다. 이러한 요구사항을 만족하기 위해서는 각 픽셀에 영상정보를 기입하는 충전시간을 급격히 감소시켜야 하고 따라서 픽셀 트랜지스터(TFT)의 이동도는 급격히 증가해야 한다. 따라서 차세대 디스플레이 실현을 위해서 고이동도 특성을 구현 할 수 있는 신물질의 개발이 매우 중요하다. 현재 산화물박막트랜지스터는 차세대 디스플레이 실현을 위해 가장 주목받고 있으며, 실제로 산화물박막 트랜지스터의 핵심소재인 In-Ga-Zn-O(a-IGZO) 산화물의 경우 국내외에서 디스플레이에 적용되어 생산이 시작되고있다. 그러나 a-IGZO 산화물의 경우 이동도가 $5-10cm^2V{\cdot}s$ 수준이어서 향후 개발 되어질 초고해상도/고속구동 디스플레이 실현(이동도 $50cm^2V{\cdot}s$)에는 한계가 있다. 따라서 본 연구에서는 이를 해결 할 수 있는 'post-IGZO' 개발을 위해 In2O3에 Ga2O3를 조성별로 고용시켜 박막의 구조적, 전기적, 광학적 특성 및 TFT를 제작하여 특성 연구를 진행하였다. 조성은 In2O3에 Ga2O3를 7.5%~15% 도핑 하였으며, Sputtering을 이용하여 indium gallium oxide(IGO) 박막을 제작하였다. 박막은 상온 및 $300^{\circ}C$에서 증착 하였으며 증착 된 IGO 박막은 Ga=12.5% 까지는 In2O3에 Ga이 모두 고용되어 cubic In2O3 poly crystalline을 나타내는 것을 확인하였으며 Ga=15%에서 Gallium 관련 2차상이 확인되었다. Ga양이 변화함에 따라 박막의 전기적 특성이 조절 가능하였으며 이를 이용하여 IGO 박막을 30 nm 두께로 증착 하여 IGO 박막을 channel layer로 사용하는 bottom gate structured TFTs를 제작 하였다. IGO TFTs는 Ga=10%에서 on/off ratio ${\sim}10^8$, 그리고 field-effect mobility $84.8cm^2/V{\cdot}S$를 나타내며 초고화질, 초고선명 차세대 디스플레이 적용 가능성을 보여 준다.