융제 및 Ta⁵⁺ 치환이 Lu(Nb,Ta)O₄:Eu³⁺ 형광체의 발광 특성에 미치는 영향

김지원,김영진,Kim, Jiwon,Kim, Young Jin 한국재료학회 2019 한국재료학회지 Vol.29 No.9

$Lu(Nb,Ta)O_4:Eu^{3+}$ powders are synthesized by a solid-state reaction process using LiCl and $Li_2SO_4$ fluxes. The photoluminescence (PL) excitation spectra of the synthesized powders consist of broad bands at approximately 270 nm and sharp peaks in the near ultraviolet region, which are assigned to the $Nb^{5+}-O^{2-}$ charge transfer of $[NbO_4]^{3-}$ niobates and the f-f transition of $Eu^{3+}$, respectively. The PL emission spectra exhibit red peaks assigned to the $^5D_0{\rightarrow}^7F_J$ transitions of $Eu^{3+}$. The strongest peak is obtained at 614 nm ($^5D_0{\rightarrow}^7F_2$), indicating that the $Eu^{3+}$ ions are incorporated into the $Lu^{3+}$ asymmetric sites. The addition of fluxes causes the increase in emission intensity, and $Li_2SO_4$ flux is more effective for enhancement in emission intensity than is LiCl flux. The substitution of $Ta^{5+}$ for $Nb^{5+}$ results in an increase or decrease in the emission intensity of $LuNb_{1-x}Ta_xO_4:Eu^{3+}$ powders, depending on amount and kind of flux. The findings are explained using particle morphology, modification of the $[NbO_4]^{3-}$ structure, formation of substructure of $LuTaO_4$, and change in the crystal field surrounding the $Eu^{3+}$ ions.

정인보의 실심(實心)에 대한 교육철학적 해석

김지원 ( Kim¸ Jiwon ) 한국교육철학학회 2021 교육철학연구 Vol.43 No.3

본 연구는 정인보의 실심 사상을 교육철학적 관점에서 해석하고자 하였다. 정인보는 성실하고 진실된 인간의 마음을 의미하는 실심(實心)을 각자의 존재 본체로 회복해야 한다는 ‘실심 환성(喚醒)’을 강조하였다. 실심 환성은 감통(感通)의 실천과 주체성의 확보로 이어지며 정인보는 이를 통해 국망의 위기를 극복하고자 하였다. 정인보의 실학(實學) 개념은 ‘실심의 학문적 구현’을 의미하는 것으로 학문의 목적과 태도가 실심에 근원할 때 참된 학문이 될 수 있음을 보여준다. 정인보는 동양 전통의 심학(心學)을 계승하여 실심 사상을 전개하였으며, ‘실심 환성’은 민족의 자강과 독립을 위한 시대적 과제이자 인간 본연의 보편적 과제로서의 의미를 지닌다. 실심 환성은 삶의 주재자로서 위상을 회복하고, 더불어 살아가는 이들에 대한 감통을 실천하며, 개방적이고 유연한 삶의 태도를 형성하고, 지적 배움과 성장의 동력을 확보하는 것으로 이어진다. 이는 실심을 존재 주체로 회복함으로써 나타나는 삶의 태도와 방식으로 인간의 바람직한 성장을 이끌어간다는 점에서 교육철학적 함의를 지닌다. 이러한 정인보의 실심 사상은 마음을 존재 본질로 이해하고, 마음의 본래적 발현을 교육의 근간으로 삼는 마음교육 담론에서 해석 될 수 있으며, 근대 시기의 중요한 마음교육의 사례로 주목될 수 있다. This research aims to analyze Jeong In-bo’s Silsim (實心) within the context of educational philosophy. In the history of Confucianism, Silsim refers to the “genuine and sincere Xin (心) of a human being.” Jeong In-bo emphasized the “recovery of Silsim,” stating that Silsim needs to be recovered as its true essence. He attempted to overcome the crisis of his era through social empathy and the establishment of identity via the recovery and manifestation of Silsim. His idea of Silhak (實學), an academic manifestation of Silsim, shows that academia can realize its essence only when its purpose is derived from Silsim. His Silsim theory, inheriting the Oriental tradition of School of mind (心學), is meaningful in that the recovery of Silsim represents not only national independence as a contemporary task of the era but also a natural duty as a human being. The “recovery of Silsim” leads an individual to restore independence and subjectivity, practice empathy toward others, form an open and flexible attitude in life, and secure a powerful source of motivation for intellectual learning and growth. The recovery of Silsim has significant implications in educational philosophy, as it leads to the desired growth in individual and social aspects. This philosophy of Silsim can be interpreted in the “maum-education” discourse that construes the mind as the essence of existence and recovery and manifestation as the basis of education; moreover, it can be marked as a paragon of maum-education in modern Korean history.

나노 금속 격자형 편광필름 제작에서 증착 두께에 따른 광 특성 연구

김지원,조상욱,정명영,Kim, Jiwon,Cho, Sanguk,Jeong, Myung Yung 한국마이크로전자및패키징학회 2015 마이크로전자 및 패키징학회지 Vol.22 No.1

본 연구에서는 대면적 나노 금속 격자형 편광 필름 제작에서 증착 두께에 따른 광 특성 연구를 수행하였다. 나노 금속 격자형 편광필름은 PET(Polyethylene phthalate)기판 위에 알루미늄 선 격자 구조로 구성된다. 본 연구에서는 대면적 편광필름 제작을 위한 증착공정을 통한 금속 격자 형성을 목표로 하였으며, 금속 격자형 편광 필름 제작에 있어 최적의 투과율과 소광비를 가지는 금속 박막 형성 조건을 도출하였다. 최적화 공정에 의해 나노 금속 격자형 편광필름은 140 nm 주기, 70 nm 선폭, 70 nm의 금속층 높이를 가지는 금속 격자 구조로 제작 되었다. 분석결과 600 nm 파장에서 80% 이상의 최고 투과율 및 $10^6$ 이상의 소광비를 가지는 나노 금속 격자 편광필름의 높은 광 특성을 확인하였다. In this study, we demonstrate the change of optical characteristic by thickness of metal deposition on nano metal grid polarizer film fabrication. Nano metal grid polarizer film consists of aluminium grid polarizer layer on PET (Polyethylene phthalate) substrate. We aim at metal grid layer formation for the large nano wire grid polarizer fabrication. we draw process conditions of the nano metal grid polarizer film fabrication to improve transmittance and extinction ratio and Nano wire grid polarizer film (NWGP) film is fabricated with 140 nm pitch, 70 nm width, and 70 nm depth of metal grid on optimum design conditions. As a result, we get high optical properties of nano wire grid polarizer which is the maximum transmittance of 80% and the extinction ratio of $10^6$ at 600 nm wavelength respectively.

비행경로각 조정에 의한 중거리 탄도미사일의 비행궤적 특성 해석

김지원,권용수,Kim, Jiwon,Kwon, Yong Soo 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.2

North Korea has developed ballistic missiles over the past 30 years. It is believed that they have a variety of ballistic missiles more than 1,000. Because these ballistic missiles threaten South Korea directly, accurate analysis of them is essential. Flight trajectories of the ballistic missiles are generally changed by means of adjusting payload weight, Isp, flight path angle, and cut-off time. The flight path angle is widely used to control the missile range. However it is difficult to predict the missile trajectory exactly in real operational environment because the missile could be launched according to its intention and purpose. This work analyzed the 1,000 km range MRBM's trajectory characteristics from adjusting flight path angle which is depressed as well as lofted method. The analysis of missile trajectory characteristics is based on the simulation of the missile trajectory model developed by KNDU research team.

부산시 환경기초시설 내 태양에너지(태양광/태양열) 이용 시설 설치 타당성 확인

김지원(Kim, Jiwon),최현호(Choi, Hyunho),김삼열(Kim Samuel),박재홍(Park Jeahong),김동현(Kim, Donghyun),이대선(Lee, Daeseon),박상태(Park, Sangtae),김규식(Kim, Gyusik),유재철(Yu, Jaecheul) 한국기후변화학회 2015 한국기후변화학회지 Vol.6 No.2

Neurotoxicity of Butyl Paraben using Adult Zebrafish Behavior Assay

Jiwon Kim(김지원),Soogyeong Jang(장수경),Jiyune Kang(강지윤),Kitae Kim(김기태) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5

Parabens are widely used in personal care products, pharmaceuticals, and food as preservatives due to their antimicrobial characteristics. Limited studies have reported the long-term exposure effect, in particular, on neurotoxicity of parabens. Butyl paraben (BuP) has been suggested to be the more toxic than methyl and ethyl parabens probably due to its relatively higher lipophilicity. In this study, we performed three behavior tests (i.e., novel tank, photomotor response and T-maze) with adult zebrafish upon the long-term exposure of BuP to evaluate neurotoxicity. Adult zebrafish were exposed for 28 days at three concentrations of BuP (i.e. 0.01, 0.1, and 1.0 mg/L). There were no significant alterations between BuP-exposed groups compared with the control group in the novel tank test, indicating no anxiety effect inducement. In contrast, we found that BuP reduced the mobility significantly at 1.0 mg/L and in transition of light/dark, the responsiveness of light decreased by 43% and 53% in each light photoperiod compared with control group. T-maze test revealed that the distance moved in enriched chamber (EC) decreased by 64% and 59% at 0.1 and 1.0 mg/L, respectively, and the cumulative time in EC decreased by 55% at 1.0 mg/L, indicating that the ability of learning and memory was interrupted by BuP exposure to zebrafish. Overall, our study demonstrate that BuP has a potential of neurotoxicity with respect to defects in mobility, the capacity of photosensation, and the cognitive function in adult zebrafish.

해외환자유치 의료기관의 내부서비스품질 측정도구 개발

김지원(Jiwon Kim),배성윤(Sung-Yoon Bae) 대한경영학회 2015 大韓經營學會誌 Vol.28 No.12

박물관 문화상품 개발 및 유통 플랫폼 개선 방안 연구

김지원(Jiwon Kim) 한국문화관광연구원 2018 문화정책논총 Vol.32 No.1

고압송전선의 설치에 대한 토지소유자의 권리 - 판례를 중심으로 -

김지원 ( Jiwon Kim ) 홍익대학교 법학연구소 2015 홍익법학 Vol.16 No.2

An electric utility company set up an overland transmission tower and power cables without the landowner’s consent. The landowner claimed for their withdrawal by the utility company. The majority of the Supreme Court precedents uphold withdrawal in such a case on grounds that the claim is not an abuse of rights. However, the landowner cannot execute the withdrawal by proxy because it has to be carried out directly by the electric utility. As such, unless and until the withdrawal of power cables etc. is actually carried out, the only remedy available to the landowner is to get the utility’s unjust enrichment returned. The amount of unjust enrichment to be returned depends on whether the beneficiary (i.e., the entity enriched) was in good faith or bad faith. If in bad faith, there is a split of opinion as to whether Article 201(2) or Article 748(2) of the Civil Act of Korea should be applicable. By applying Article 748(2), Supreme Court precedent includes interest in the amount of unjust enrichment to be returned. Other remedies for dispute resolution as cited by the precedents include tort damage claim and compensation for eminent domain, which, however, may still leave the conflict unresolved between landowner and utility.

항행 및 항법 : 항력을 고려한 탄도미사일 비행궤적 특성 해석

김지원 ( Jiwon Kim ),권용수 ( Yong Soo Kwon ) 한국항행학회 2016 韓國航行學會論文誌 Vol.20 No.2

본 연구는 항력을 고려한 탄도미사일의 비행궤적 특성에 대한 해석이다. 탄도미사일은 대부분 대기권 밖에서 초고속으로 비행하고 RCS가 작기 때문에 요격이 어렵다. 특히 부스트 및 종말단계에서는 급격한 항력의 변화에 따라 속도의 변화가 매우 커진다. 따라서 성공적인 탄도미사일 방어체계를 구축하기 위해서는 탄도미사일의 비행궤적 해석 시 항력 특성을 반드시 고려해야 한다. 이러한 관점에서 본 연구는 항력에 대한 특성을 분석하고, 이를 고려하여 스커드 B, C 및 노동미사일의 비행궤적 특성을 도출하였다. 탄도미사일의 비행궤적 모델은 지구 자전에 의한 코리올리힘과 원심력을 반영하였으며, 탄도미사일의 제원은 공개된 자료를 활용하였다. This paper analyzed flight trajectory characteristics of ballistic missiles considering effects of drag forces. It is difficult to intercept ballistic missiles which fly over atmosphere with supersonic speeds and small radar cross section (RCS). In particular, the velocities in the phases of boost and terminal are changed significantly due to the steep variation of the drag force. Therefore, in order to build up a successful ballistic missile defense systems, the effects of the drag forces should be considered in the analysis of ballistic missile trajectory characteristics. In this point of view, this work analyzed the effects of drag forces and derived the flight trajectory characteristics of Scud B, C and Nodong missiles. Model of the ballistic missile flight trajectory is considered the effects of Coriolis and centrifugal forces, and specifications of the missiles are open sources.