• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.1404-1405
• /
• 2015

최근 들어 3D프린터의 특허권이 만료됨에 따라 3D프린터 연구 및 생산이 활발히 이루어지고 있으며, 저렴한 개인용 3D프린터의 보급으로 남녀노소 누구나 활용할 수 있게 되었다. 하지만 3D프린터를 이용하여 자신이 원하는 제품을 출력하기란 쉽지 않다. 버튼만 누르면 되는 인쇄물 프린터와 달리 3D프린터의 데이터를 제작하기 위해서는 3D 모델링 제작 툴이나 3D 스캐너를 이용해야한다. 이러한 제작 프로그램이나 제품은 개인이 사용하기에는 가격이 고가이며, 사용 방법을 익히는데 많은 시간과 노력이 필요하다. 이에 본 논문에서는 3D 데이터의 획득에 있어 쉽고 간편한 3D 데이터 변환 제작 알고리즘을 이용하여 3D 프린터의 사용 편리성을 향상시킬 수 있다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2002.11a
• /
• pp.334-337
• /
• 2002

In this study, the microstructure, dielectric and piezoelectric properties of $0.15Pb(Ni_{1/3}Nb_{2/3})O_3-0.85(PbZr_{0.5}Ti_{0.5})O_3$(0.15PNN-0.85PZT) ceramics having compositions near the morphotropic phase boundary(MPB) was investigated with respect to the variation of $Y_2O_3$ and $Ga_2O_3$ addition amount. The dielectric properties increased and piezoelectric properties decreased with increasing the amount of $Ga_2O_3$. The solubility limit of $Y_2O_3$ is 0.5mol% in this system. The electro-mechanical coupling factor$(K_p)$ and dielectric constant(${\varepsilon}_r$) were 58.6% and 1755 when the amount of $Y_2O_3$ are 0.5mol%.

• Korean Journal of Food Science and Technology
• /
• v.35 no.6
• /
• pp.1199-1203
• /
• 2003

Polyphenols were isolated from Korean green tea using Sephadex LH-20 and HPLC. The isolated polyphenols were procyanidin B-4, procyanidin B-2-3,3'-digallate, prodelphinidin C-2-3,3'-di-O-digallate, (+)-catechin-3-O-rhamnose, procyandin B-5, procyanidin B-7-3-0-gallate, gallate, epiafzelechin-$(4{\beta}{\rightarrow}8)$-epiafzelechin, procyanidin B-3-3-O-rhamnose, afzelechin-$(4{\alpha}{\rightarrow}8)$-catechin, prodelphinidin B-5-3,3'-di-O-digallate and (+)-taxifolin-3-O-D-xyloside. The inhibitory effects of prodelphinidin C-2-3,3'-di-O-gallate and procyanidin B-2-3,3'-digallate $(at\;100{\mu}M)$ on angiotensin.converting enzyme were 68.8 and 54.6%, respectively, while the inhibitory effects of prodelphinidin C-2-3,3'-di-O-gallated and procyanidin B-2-3,3'-digallate $(at\;100{\mu}m)$ on xanthine oxidase were 54.5 and 38.2%, respectively. Lastly, the inhibitory activities of prodelphinidin C-2-3,3'-di-O-gallate $(at\;100{\mu}m)$ on tyrosinase was 42.1%.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.04a
• /
• pp.106-108
• /
• 2017

본 논문에서는 휘어지거나 굴곡진 array인 3차원 conformal array의 beam pattern을 보정하고자 기존의 2차원에서 3차원으로 확장한 interpolation technique과 compressive sensing을 이용하여 3-D uniform rectangular array(3-D URA)에 적용하는 방법을 연구하였다. 시뮬레이션 결과는 compressive sensing이 interpolation technique보다 우수한 특성을 보여준다.

• Korean Journal of Pharmacognosy
• /
• v.34 no.2 s.133
• /
• pp.128-131
• /
• 2003

Four compounds were isolated from the roots of Dipsacus asper roots, and were identified as methyl 3,5-di-O-caffeoyl quinate, 3,5-di-O-caffeoyl quinic acid, sitosterol $3-O-{\beta}-D-Glucopyranoside$ and hederagenin $3-O-{\alpha}-L-arabinopyranoside$. Among the isolated compounds, methyl 3,5-di-O-caffeoyl quinate and 3,5-di-O-caffeoyl quinate acid have never been reported previously from this plant.

• Archives of Pharmacal Research
• /
• v.20 no.1
• /
• pp.88-90
• /
• 1997

Two compounds were newly isolated from the leaves of Aloe barbadensis Mill. Their strucutres were identified as 3, 4-dihydro-3, 9-dihydroxy-8-methoxy-3-methyl-1(2H)-anthracenone(1) and 10-.betha.-D-glucopyranosyl-1, 80, 10-trihydroxy-3-(hydroxymethyl)-(R)-9(10H)-anth racenone(2) by chemical and spectral evidences.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2010.06a
• /
• pp.305-305
• /
• 2010

In this study, in order to develop excellent lead free piezoelectric ceramics for piezoelectric transformer application (Na,K)(Nb,Sb)$O_3$ ceramics were fabricated using conventional oxides mixed method and their piezoelectric and dielectric characteristics were investigated according to the amount of $Bi_2O_3$ addition.

• Proceedings of the KIPE Conference
• /
• 2018.11a
• /
• pp.225-226
• /
• 2018

전기자동차 배터리팩을 충전하기 위한 장치인 차량용 OBC(On-Board Charger)는 AC/DC 컨버터 기능을 담당하는 PFC(Power Factor Correction)와 DC/DC 전력변환 및 전기적 절연을 담당하는 Phase-Shifted Full Bridge Converter를 포함 한다. 현재 시중에 3.3kW급 OBC를 기준으로 규격화되어 생산되고 있지만 전기자동차의 배터리 용량이 날로 증가하고 전기자동차 보급, 사용률이 증가함에 따라 완속충전에 대한 요구가 높아지고 있다. 여기에 전력 인프라 시설 개선과 더불어 6.6kW급 완속충전이 보편화될 수 있게 된다. 차량용 OBC 공급업체에 있어서는 기존의 3.3kW급과 6.6kW급 OBC의 개발 중 어느 쪽에 중심을 둘지 고민에 대한 대안으로 기존의 3.3kW급을 모듈화하여 병렬운전하는 방법으로 6.6kW급 OBC 시장수요에 대응 할 수 있다. 본 논문에서는 3.3kW급 OBC 및 2병렬운전에 관한 시뮬레이션을 개발하고 분석하였다.

• The Journal of Natural Sciences
• /
• v.14 no.2
• /
• pp.103-114
• /
• 2004

This study aims at investigating the effect of soil moisture control and truss limited high density culture on the growth, fruit yield and quality of tomato. To minimize of loss yield of tomato, flower cluster in number was limited to two and three truss and planting density was raised. Soil moisture control was started from 40 days after anthesis and irrigation point was set in -30kPa and -50kPa, which were compared with -10kPa For high density culture, the planting number of truss limited high density culture was planted twice as many as control. Soil moisture repression reduced the growth of stem diameter, leaf and plant height. Leaf chlorophyll content was higher in -50kPa and -30kPa than control. No significant differences, however, shows in -10kPa. The occurrence rate of bloom-end rot and cracking was increased by growing of irrigation repression. Pinching three fruit truss was higher than pinching two fruit truss in the occurrence rate of them. Soil moisture repression resulted in the reduction of fruit weight and in special, truss limited high density was distinctly decreased in -50kPa. The number of fruit was not affected by soil moisture control, but 3rd flower cluster was lower than 2nd flower cluster in the number of fruits and 2nd one was lower than 1st one. Under irrigation repression, rate of dry matter tended to grow in -30kPa, -50kPa compared with control and pinching three fruit truss was higher than two truss. Marketable yield dropped to 36.7%m 46.3 in -30kPa, -50kPa on pinching two fruit truss and dropped to 27.3%, 32.3% in 3rd flower cluster compared with control.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2014.06a
• /
• pp.146-149
• /
• 2014

최근 ATSC는 방송망 기반의 서비스호환 3DTV 방송서비스 표준완료 이후 이종망 환경에서 하이브리드 3DTV 방송서비스에 대한 표준화를 진행 중에 있다. 본 논문에서는 기존의 디지털방송 화질열화 없이 Full HD 3D 화질을 보장하기 위한 방송망 및 IP 망 연동형 3D 비디오 방송시스템을 제안한다. 특히, ISO/IEC 23009-1 DASH를 활용한 3D 부가 영상 전송, 이종망 환경하에서 안정적인 3D 비디오 동기화 및 하이브리드 3DTV 수신기 개발을 위한 시스템 타켓 디코더 모델을 기술한다. 실험결과, 제안된 기술은 하이브리드 3DTV 방송 표준화에 직접적으로 적용될 수 있으며, 하이브리드 3DTV 인코더 및 수신기 개발에 있어서 참조 모델로 활용될 수 있음을 확인하였다.