• 한국광학회:학술대회논문집
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• 한국광학회 1998년도 제15회 광학 및 양자전자 학술발표회 논문집
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• pp.70-71
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• 1998

• 한국고분자학회지:고분자과학과기술
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• 제7권6호
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• pp.679-689
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• 1996

• 한국광학회:학술대회논문집
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• 한국광학회 1999년도 제16회 광학 및 양자전자 학술발표회Proceedings of 16th Optics and Quantum Electronics Conference, 1999
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• pp.190-191
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• 1999

• 복식문화연구
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• 제10권2호
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• pp.200-212
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• 2002

The purpose of this study is to make the internet website on the order-made fashion design so as to do meet the need of netizen in the 21st century. It made the consumer do the design which he or she wants by the combination of the compositions that do select the pattern of the skirt design to fit his or her size and body shape. For the set-up of website, the elements of composition must be considered, and also the planning and design must be done fur the order-made fashion design. With the internet website, it's possible to do reach the below points; first, it can make the consumer do the design which he or she wants by himself or herself; second, it can provide him or her the information of measuring his or her body shape to buy the design pattern which he or she wants. Third, it can be contributed to make the brand more active by improving his or her satisfaction with the design and pattern which he or she wants. Also it can bring up the effects as fellows; first, lashing power of the design can be increased by the order-made fashion design to attract his or her interest, and also it can make him or her more satisfied. Second, the competitiveness can be strengthened by the differentiation of the fashion site between the existing design and the order-made fashion design. Third, the production of design can be higher and also its expense can be reduced even for the small and medium-sized clothes maker or merchants. Finally, it is able to enlarge the applicable field into the design of small articles, home fashion, and textile which they want to sell the differentiated and order-made products.

• 한국전자통신학회논문지
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• 제15권5호
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• pp.827-834
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• 2020

본 연구는 주파수 체배기 이론을 이용하여 초고주파 항공용 레이다를 위한 3차 고조파 믹서 설계에 대한 연구이다. 기본 믹서 설계 방법과는 달리 주파수 체배기 이론을 이용하여 국부 주파수(LO)의 3차 고조파 성분이 최대가 되는 게이트 바이어스 전압을 선택하여 중간주파수(IF)에서 3차 고조파 혼합(mixing) 성분이 최대가 되도록 하였다. 제안한 고조파 믹서는 플라스틱 패키지의 상용 GaAs MESFET 소자를 이용하여 설계 및 제작하여 기존 초고주파 믹서의 높은 변환손실, 회로 복잡성, 높은 가격 및 제작 복잡도를 개선할 수 있었다. 제안한 설계 방법을 이용한 3차 고조파 믹서는 33 GHz ~ 36 GHz 대역에서 8 ~10 dB 변환손실 특성 및 0 dBm 선형성 (P1dB) 특성을 나타내었다.

• Bulletin of the Korean Chemical Society
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• 제32권5호
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• pp.1443-1454
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• 2011

Methods to prepare novel second-order nonlinear optical (2O-NLO) materials composed of all-silica zeolite (silicalite-1) and a series of 2O-NLO molecules having high second order hyperpolarizability constants (${\beta}$ values) are reviewed. These methods include the development of novel methods to incorporate a series of hemicyanine (HC) molecules into the channels of silicaite-1 films in uniform orientations. The first method is to incorporate HC molecules tethered with long alkyl chains (octadecyl or longer) into the silicalite-1 channels with the long alkyl chain side first through the hydrophobic-hydrophobic interaction between the long alky chains and the silicalite-1 channels. The second method is to incorporate the HC molecule tethered with a medium length alkyl chain (nonyl) into the silicalite-1 channels with the medium length alkyl chain side first through hydrophobic-hydrophobic interaction between the medium length alky chain in the photoexcited state and the silicalite-1 channels. The third method is to incorporate the HC molecule tethered with propionic acid into the silicalite-1 channels with the propionic acid side last mediated by a tetrabultylammonium cation ion-paired to the propionate unit. A method to prepare a novel third-order nonlinear optical (3O-NLO) material composed of zeolite-Y and PbS or PbSe quantum dots is also reviewed. This Account thus describes a promising new direction to which the search for highly sensitive 2O-NLO and 3O-NLO materials has to be conducted and a new direction to which zeolite research and applications have to be expanded.

• 한국광학회지
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• 제5권1호
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• pp.18-24
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• 1994

전도성 고분자 박막의 스펙트럼, 가간섭 길이 및 3차 비선형 광학 감수율의 측정방법을 연구했다. 시료박막의 대한 Maker fringe를 용융석영에 대한 것과 비교하고 선형 굴절률에 의한 효과를 보정하여 3차 비선형 광학 감수율값을 계산했다. 선형 굴절률값의 계산을 위하여는 투과율 스펙트럼에서 투과율의 극대(극소) 값의 포락선이 사용되었다. Spin coating 방법을 사용하여 제작된Poly((1,4-phenylenevinylene$)_{0.34}$-co-(2-methoxy-1,4-phen ylene vinylene$)_{0.66}$) [PP$V_{0.34}$-PMP$V_{0.66}$] 박막에 대해서 투과율 스텍트럼과 Maker fringe를 측정한 후, 이들 data로부터 구한 1907 nm 펌프 파장에 대한 굴절률, 가간섭길이 및 3차 비선형 광학 감수율 값은 각각 1.786, 17.86 ${\mu}m$ 및 5.8${\times}10^{12}$esu였다.

• Bulletin of the Korean Chemical Society
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• 제24권9호
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• pp.1293-1302
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• 2003

Rate constants at various temperatures and activation parameters are reported for solvolyses of acyl chlorides (RCOCl), with R = Me, Et, i-Pr, t-Bu, cyclopentylmethyl, benzyl, thiophenylmethyl, 2-phenylethyl, diphenylmethyl, and phenylthiomethyl in 100% ethanol, 100% 2,2,2-trifluoroethanol (TFE), 80% v/v ethanol/ water and 97% w/w TFE/water. Additional rate constants for solvolyses with R = Me, t-Bu, and $PhCH_2$ are reported for TFE/water and TFE/ethanol mixtures, and for solvolyses with R = t-Bu, and PhCH2 are reported for 1,1,1,3,3,3-hexafluoropropan-2-ol/water mixtures, as well as selected kinetic solvent isotope effects (MeOH/MeOD and TFE). Taft plots show that electron withdrawing groups (EWG) decrease reactivity significantly in TFE, but increase reactivity slightly in ethanol. Correlation of solvent effects using the extended Grunwald-Winstein (GW) equation shows an increasing sensitivity to solvent nucleophilicity for EWG. The effect of solvent stoichiometry in assumed third order reactions is evaluated for TFE/ethanol mixtures, which do not fit well in GW plots for R = Me, and t-Bu, and it is proposed that one molecule of TFE may have a specific role as electrophile; in contrast, reactions of substrates containing an EWG can be explained by third order reactions in which one molecule of solvent (ethanol or TFE) acts as a nucleophile, and a molecule of ethanol acts as a general base catalyst. Isokinetic relationships are also investigated.

• 대한기계학회논문집A
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• 제25권10호
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• pp.1551-1558
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• 2001

Recently, a number of underground pipelines have been drastically increased. The integrity of these buried pipelines, especially gas transmitting pipelines, is of importance due to an explosive characteristic of natural gas. The third party damage is known as one of the most critical factor which causes fatal accidents. For this reason, a number of systems detecting third party damage are under development. The major concern in the development of third party damage detection system is to transmit vibration signals out of accelerometer to signal conditioner and data acquisition system without any interference caused by noise. The objective of this paper is to develope a fiber optic accelerometer applicable to third party damage detection system. A fiber optic accelerometer was developed by use of combining principles of one degree of freedom vibration model and an extrinsic Fabry-Perot interferometer. The developed fiber optic accelerometer was designed to perform with a sensitivity of 0.06mVg, a frequency range of less than 6kHz and an amplitude range of -200g to 200g. The developed, accelerometer was compared with a piezoelectric accelerometer and calibrated. In order to verify the developed accelerometer, the field experiment was performed. From the field experiment, vibration signals and the location of impact were successfully detected. The developed accelerometer is expected to be used for the third party damage detection system which requires long distance transmission of signals.

• 대한전자공학회논문지TC
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• 제49권5호
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• pp.27-36
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• 2012

본 논문에서는 스마트 안테나 시스템에 대해 경로 결함들의 보정과 전력 증폭기의 비선형성 보상을 결합하는 새로운 기술을 제안하였다. 배열 안테나의 각각의 경로들이 동일한 특성을 갖기 위한 보정과 보상을 위해 선형 항에 3차 항을 추가한 다항식과 간접 학습 구조를 사용하였다. 본 논문에서는 컴퓨터 모의실험을 통해 성능을 입증하였다. 모의실험 결과, 단 하나의 3차 항을 추가하여 선형 결함들뿐만 아니라 모든 비선형 효과까지 효율적으로 보상함을 확인하였다.