• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.11
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• pp.2677-2682
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• 2015

Smart factory has the function of integrated management of production process management, logistics management as a intelligent factory, it is also emerging as the core of new industry which converges ICT and manufacturing business. We suggested Smart factory logistics management system which embedded position tracking technology and the system converges ICT and IoT. This suggested system can manage all the processes from production to release by tracking route and position based on signal strength of bluetooth 4.0 beacon tag. For the more, we will expect to apply to the various type of factory environments like detachable installation, optimized management using sensor.

• Journal of the Korean Institute of Gas
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• v.12 no.2
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• pp.32-37
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• 2008

For a development of U-safety system, liquid/gas-sensors that are easy to carry and install in any place are needed. Therefore, in this work, we prepared porous gold using a templating method with nanoporous alumina, and it was used as sensing materials and electrode. The resulting materials showed high purity macroporous structure with $200{\sim}300\;nm$ of window-pore and $4.8\;m^2/g$ of surface area. Because porous gold had good electric conductivity, convenience to measure the change of electric resistivity and good reproducibility, it could be used as potential sensing materials. As a proof-of-concept test, the detection test for mercury ion was carried out.

• Annual Conference of KIPS
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• 2015.10a
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• pp.1416-1419
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• 2015

최근 건강에 대한 일반인들의 관심이 증가하면서 스마트 헬스케어 시장 규모가 기하급수적으로 커지고 있다. 특히 탈모 관련 헬스케어 시장의 경우, 국내 탈모 인구의 증가로 인해 탈모의 예방이나 관리 등 탈모 관련 어플리케이션이 빠르게 등장하고 있다. 모발 밀도는 탈모의 정도를 판단하기 위한 가장 기본적인 모발 특징 중 하나이지만, 모발의 밀도를 측정하기 위한 명확한 영상처리 기법이나 소프트웨어의 개발은 여전히 미진한 상태이다. 이에 본 논문에서는 스마트폰에 탈부착이 가능한 포터블 카메라에서 촬영된 두피 모발 현미경 영상에서 모발의 밀도를 측정하고 이를 기반으로 사용자 중심의 탈모 진단 플랫폼을 구축하고자 한다. 모발 밀도의 측정은 Contrast Stretching과 Morphology Processing을 이용한 전처리, 스켈레톤 이미지의 변환, 그리고 라인 끝점 검색 알고리즘의 적용 등 크게 세 단계로 진행된다. 제안하는 기법의 성능 평가를 위해, 50배율 포터블 카메라로 촬영한 두피 영상 30개에 대해 밀도 측정을 수행하였으며 그 결과 92.88%의 정확도를 얻었다. 결과적으로 제안하는 기법은 단순 두피 현미경 영상으로 탈모의 지표가 될 수 있는 모발 밀도를 측정하는 데 충분히 효과적임을 알 수 있다.

• Journal of the Korean Institute of Gas
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• v.25 no.1
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• pp.7-13
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• 2021

The re-liquefaction drum is a product that installed spray nozzles at the top to directly spray overcooled LNG into evaporative gas and installed demistors to facilitate gas separation, which was developed to increase the re-liquidity efficiency of small scale re-liquefaction facilities. In the hydrostatic test of the drum, no leakage occurred even at a pressure of 1.5 times the design pressure, but during the BOR(Boil Off Rate) test, the bolt loosening occurred due to contraction and expansion by temperature change. For the continued use of the product, insulation construction on flange connections was developed to enable detachment and attachment, and the comparison of heat load with existing insulation confirmed that it was very small compared to the inlet flow rate in the drum.

• Journal of IKEEE
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• v.28 no.2
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• pp.131-135
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• 2024

In this study, the sensor such as current transformer type was developed for measuring non-contact partial discharge in power electrical facilities, and the results of the characteristic evaluation were discussed. The frequency response characteristics of the HFCT sensor were shown to be measurable from 20 [kHz] to 20 [MHz]. The average sensitivity for the positive direction was 0.308 [mV/pC], and the negative direction was 0.459 [mV/pC]. Which showed that the sensitivity for the negative direction was better than that for the positive direction. The developed HFCT sensor is possible to measure very small partial discharge pulse signals and can be measured various types of partial discharge that may occur at power electrical facilities.

• Polymer(Korea)
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• v.38 no.2
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• pp.164-170
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• 2014

This study was designed to find an appropriate biomaterial to proliferate Schwann cell (SC). Poly(lactic-co-glycolic acid) (PLGA) films mixed with demineralized bone particle (DBP), small intestine submucosa (SIS), and silk were fabricated by a solvent casting method. Analysis of MTT, SEM and RT-PCR were performed to confirm adhesion and proliferation of SC. Contact angle of films was assayed for hydrophilicity of films. We confirmed that PLGA/DBP 20% film showed higher hydrophilicity, promoted adhesion and proliferation of SC than other films. It was concluded that PLGA/DBP film can be applied for the scaffold biomaterials for the regeneration of central nerve system.

• Polymer(Korea)
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• v.38 no.3
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• pp.278-285
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• 2014

Demineralized bone particles (DBP) and alginate hybrid sponges were fabricated at 10, 20, 40 and 80% DBP/alginate hybrid ratios for seeding chondrocyte. Cell proliferation was measured via MTT assay. Morphological observation, histology, biological assay and RT-PCR were performed at each time point 1, 2 and 3 weeks. The cell viability was better in 20% DBP/alginate sponges than in other sponges. SEM results showed that more attached and more proliferated cells in the 20% DBP/alginate sponges with the lapse of time. Finally, histochemical assay results showed that the phenotype of chondrocyte was well maintained and both acidic mucopolysaccharide and type II collagen was well formed at 20% sponges. This study suggested that DBP/alginate sponge may serve as a potential cell delivery vehicle and a structural basis for tissue engineered articular cartilage.

• Polymer(Korea)
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• v.32 no.2
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• pp.109-115
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• 2008

Because demineralized bone particle (DBP) contains various bioactive molecules such as cytokines, it is widely used biomaterials in the field of tissue engineering. In this study, we investigated the effect of 2-dimensional DBP/PLGA hybrid films on adhesion, proliferation and phenotype maintenance of intervertebral disc cells. PLGA films incorporated with different amount (0, 10, 20, 40 and 80 wt%) of DBP were prepared by the solvent evaporation method and characterized by scanning election microscopy (SEM). PLGA film has a flat and smooth surface. According to the increase of content of DBP, the surface of DBP/PLGA film exhibited few agglomerates and increased the roughness of the surface. Annulus fibrosus (AF) and nucleus pulposus (NP) cells were cultured on PLGA and DBP/PLGA film surface, and then examined the cell adhesion and proliferation by the cell count and SEM observation. The result of cell count and SEM observation revealed that 10 and 20% DBP in DBP/PLGA films were superior to adhesion and proliferation of both AF and NP cells. We confirmed that specific gene expression of disc cells on DBP/PLGA film based on the cell count result. Disc cells seeded on 20% DBP/PLGA film expressed the gene of type I and II collagen continuously. Therefore, pertinent content of biomaterials could provide more appropriate condition on adhesion and proliferation of cell. And this results may be used as a basic data for the intervertebral disc regeneration using tissue engineering.

• Polymer(Korea)
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• v.39 no.3
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• pp.493-498
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• 2015

For biomaterials for skin regeneration with minimized inflammatory response, high bioactivity and biocompatibility are highly required. Also, it should have a porous microstructure to improve cell adhesion and growth. In this study, we extracted a new collagen source from duck's feet which is by-product, and made the shape of sponges from duck's feet collagen (DC) to compare with DBP and SIS. To analyze physical and chemical property of the scaffold, SEM and FTIR were used. MTT assay was used to measure the attachment and proliferation of NIH/3T3 in the scaffolds. RTPCR was used to evaluate the expression of proinflammatory cytokine. Also, 1,1-diphenyl-2-picrylhydrazyl (DPPH) was used to measure the ability of antioxidant activity. Overall, this study shows that DC scaffold is biocompatible and has good physical property. Additionally, DC scaffold shows the potential as wound healing biomaterials.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.29 no.11
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• pp.559-569
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• 2017

Various studies examining how to conserve building energy have been conducted recently. From such studies it has been determined that insulation performance of an aircap is viable and therefore aircaps are used as material for improving insulation performance of windows. However, the aircap for improving insulation performance of a window is attached on the front, causing infringement of the prospect right. Therefore, the purpose of this study is to develop an aircap module attached to the window through rolling, conducting performance verification throughfull-scale testbed and verifying its effectiveness. Findings of this study are as follow : 1) The module suggested in this study enables setting of an area wherein the aircap is attached through rolling so that the aircap rolls up using Velcro tape, and an insulation bar is suggested to block the gap between the aircap and window glass. 2) When the aircap is applied to the window, consumption of lighting energy increased during summer and winter by 2.8%~16.4% and 0%~76.2% respectively in comparison to no aircap application, indicating that it is unsuitable for conserving lighting energy. 3) In terms of conserving cooling and heating energy, an advantageous or effective aircap attachment method is the method whereby an aircap is attached to the front surface of a window. However, the method whereby an aircap is attached to a part of a window and where no aircap is attached increases consumption of cooling and heating energy during summer and winter by 6.0%~35.7% and 2.7%~41.6% respectively in comparison to the method wherein an aircap is attached to the front surface of a window. 4) In consideration of conserving cooling, heating and lighting energy, the attachment of an aircap to the front surface of window is the most appropriate method, and it is appropriate to attach the aircap at a position that is 1,500 mm or higher from the floor to secure the prospect right and minimize energy loss.