• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.129-130
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• 2015

The purpose of this research is to investigate consciousness for the effect of evacuation guidance in case of ship blackout condition evacuation. As a research result, 74.3% of respondents answered that evacuation guidance is strongly helpful in the event of ship blackout condition.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.62 no.9
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• pp.1290-1296
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• 2013

The light intensity which represents the relative amount of brightness and darkness is very important feature to discern the color hue and its relevant information. With this aim, we devise a new optical system and method to analyze the light intensity. Our suggested system including a phototransistor and white-high-brightness chip light-emitting diode intend estimate the contrast value utilizing Image Research Institute(I.R.I.) Hue & Tone samples which includes 120 color sheets arranged by the color hue and tone. As a result, we confirmed that the brightness of the color checker can be accurately estimated by a high-brightness light-emitting-diode optical system.

• The Korean Journal of Physiology and Pharmacology
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• v.4 no.5
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• pp.339-346
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• 2000

Using murine immortalized microglial cells (BV-2), we examined the regulation of RANTES production stimulated by lipopolysaccharide (LPS), focusing on the role of mitogen-activated protein kinase (MAPK) and nuclear factor $(NF)-{\kappa}B.$ The result showed that RANTES (regulated upon activation of normal T cell expressed and secreted) was induced at the mRNA and protein levels in a dose- and time-dependent manner in response to LPS. From investigations of second messenger pathways involved in regulating the secretion of RANTES, we found that LPS induced phosphorylation of extracellular signal-regulated kinase (Erk), p38 MAPK and c-Jun-N-terminal kinase (JNK), and activated $(NF)-{\kappa}B.$ To determine whether this MAPK phosphorylation is involved in LPS-stimulated RANTES production, we used specific inhibitors for p38 MAPK and Erk, SB 203580 and PD 98059, respectively. LPS-induced RANTES production was reduced approximately 80% at $25\;{\mu}M$ of SB 203580 treatment. But PD 98059 did not affect RANTES production. Pyrrolidine-dithiocarbamate (PDTC), $(NF)-{\kappa}B$ inhibitor, reduced RANTES secretion. These results suggest that LPS-induced RANTES production in microglial cells (BV-2) is mainly mediated by the coordination of p38 MAPK and $(NF)-{\kappa}B$ cascade.

• Korean Journal of Ichthyology
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• v.19 no.1
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• pp.66-69
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• 2007

Seventeen specimens (29.1~50.7 mm SL) of the starry goby, Asterropteryx semipunctata, were collected from the southern coast of Jeju Island, Korea, and described as the first record from Korea. The species is characterized by having separated pelvic fins, five to eight short spines on posterior margin of preopercle, and numerous blue spots on head, body and unpaired fins except for first dorsal when fresh. We proposed a new Korean name, 'Cheong-byeol-mang-duk', for the species.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.287-288
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• 2013

Concerns on the floating architecture development has been increased on the viewpoint of ocean space due to the increases of GDP and environmental issues such as sea level rise. However, basic research on the water heat exchanger for utilizing seawater thermal energy is insufficient. So, The purpose of this research is to develop a sea water heat exchanger model and to evaluate the performance throughout the experiment for seawater heat utilization.

• ETRI Journal
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• v.39 no.3
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• pp.390-397
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• 2017

In this paper, we propose a scheme for designing a tunable pixel layer based on a $Ge_2Sb_2Te_5$ (GST) alloy thin film. We show that the phase change of GST can significantly affect the reflection characteristic when the GST film is embedded into a dielectric encapsulation layer. We investigate the appropriate positions of the GST film within the dielectric layer for high diffraction efficiency, and we prove that they are antinodes of Fabry-Perot resonance inside the dielectric layer. Using the proposed scheme, we can increase the diffraction efficiency by about ten times compared to a bare GST film pixel, and 80 times for the first-to-zeroth-order diffraction power ratio. We show that the proposed scheme can be designed alternatively for a broadband or wavelength-selective type by tuning the dielectric thickness, and we discuss a multi-phase example with a double-stack structure.

• Journal of IKEEE
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• v.24 no.2
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• pp.610-618
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• 2020

This paper presents the modeling of hybrid railway vehicles with hydrogen Fuel-Cells (FCs)/battery using a rule-based algorithm. The driving power of traction system is determined with the speed-torque curve by operation area of the electric machine and the electrical systems are modeled. The demanded power of electrical systems is set with the energy management system (EMS). The consumption of hydrogen is effectively managed with the subdivided operation region depending on the state of charge (SOC). The validity of the modeling is verified using MATLAB/Simulink.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.319.2-319.2
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• 2014

휴대기기 발전과 사용 증가로 인해 배터리의 고용량화와 소형화가 요구되고 있으며, 특히 의료용 센서 기기 같은 health care device에서 소형화에 대한 관심이 증가하였다. 박막 이차 전지는 박막형태로 배터리의 구성요소를 한층씩 쌓아 올린 형태이므로 소형화가 가능하며, 내부에 액체전해질이 없어 누액으로 인한 폭발등의 염려가 없다. 또한 Si 반도체 소자에 integration 할 수 있어 다양한 분야에 적용할 수 있다. 하지만 Si 소자에 integration시 리튬이 기판으로 확산되어 배터리 용량이 감소하거나 Si 소자에 악영향을 미칠 수 있다. 따라서 본 연구에서는 리튬의 확산 여부를 민감하게 평가할 수 있는 방법 및 리튬 확산을 억제할 수 있는 확산방지막에 대한 연구를 진행하였다. 리튬의 확산을 평가하는 방법으로는 물리적 분석 방법 및 전기적 분석 방법을 평가하여 가장 민감한 방법을 선정하였다. 또한 확산방지막으로는 반도체 배선공정에서 Cu 확산 방지막으로 사용되고 있는 Ta, TaN 등과 함께 Na 확산 방지막으로 알려진 $Al_2O_3$ [1]등을 평가하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.330.1-330.1
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• 2014

개인용 노트북, 태블릿 PC, 핸드폰 기술 발전에 의해 언제 어디서나 데이터를 작성하고 기록하는 일들이 가능해졌다. 특히 cloud 시스템을 이용하여 데이터를 휴대기기에 직접 저장하지 않고 server에 기록하는 일들이 가능해짐에 따라 server 기기의 성능, server-room power 및 space 에 대한 관심이 증가하였다. Storage class memory (SCM) 이란 memory device와 storage device의 장점을 결합한 memory를 일컫는 기술로 현재 소형 디바이스 부분부터 점차 그 영역을 넓히고 있다. 그중 phase change material을 이용한 phase change memory (PCM) 기술이 가장 각광받고 있다. PCM의 경우 scaling됨에 의해 cell간의 열 간섭으로 인한 data 손실의 우려가 있어 cell의 면적을 최소화 하여 소자를 제작하여야 한다. 기존의 sputtering등의 PVD 방법으로는 한계가 있어 ALD 공정을 이용한 PCM에 대한 연구가 활발히 진행중이다. 특히 tellurium 원료기체로 silyl 화합물 [1]을 사용하여 주로 $Ge_2Sb_2Te_5$의 조성에 초점을 맞춰 진행되고 있으나, 세부 공정에 대한 기본적인 연구는 미비하다. 본 연구에서는 Ge-Sb-Te 3원계 박막을 형성하기 위한 Sb-Te 화합물의 증착 공정에 대한 연구를 수행하였다. 특히 원료기체로 Si이 없는 새로운 Te 원료기체를 이용하여 조성 조절을 하였고, 박막의 물성을 분석하였다. 또한 공정온도에 따른 박막의 물성 변화를 분석하였다.

• Korean Journal of Pharmacognosy
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• v.43 no.4
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• pp.274-278
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• 2012

As part of ongoing study focused on the discovery of natural antioxidants from Korean plants by measuring the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging effect and superoxide quenching activity, ethanol extract of the aerial parts of Curcuma longa (Zingiberaceae) was found to show potent antioxidant activities. Subsequent activity-guided fractionation of the ethanol extract led to the isolation of two phenolic compounds, 1,2,3,4,6-penta-O-galloyl-${\beta}$-D-glucopyranoside (1) and gallic acid (2), as antioxidant compounds. Their structures were elucidated by spectroscopic studies. Compounds 1 and 2 were isolated for the first time from this plant. These compounds showed the significant antioxidative effects during the DPPH free radical scavenging test, and the riboflavin- and xanthine-originated superoxide quenching activity tests.