• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 D
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• pp.1506-1507
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• 1998

Stearic acid LB films was deposited by LB technique. The deposition status of LB films were verified by UV absorbance which was increased in proportion to the number of layers. And, I-V characteristics were measured to investigate the response properties between LB films and organic gases using the distance of electrodes. The current was increased with the applied voltage but decreased as increasing the distance of electrodes. The conductivity of stearic acid LB films using the distance of electrodes was $10^{-8}$[S/cm], which corresponds to that of the semiconductor.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.195-198
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• 1996

In conducting systems based on LB films, TCNQ derivatives have been extensively studied as electron acceptor molecules. We have investigated the optical, electrical, and magnetic properties of Viologen-(TCNQ￣)$_2$LB films. In UV/visible absorption measurements, we have observed TCNQ￣ peak at 380 nm and dimer peak at 620 nm. The electron spin resonance measurements infer that Viologen-(TCNQ￣)$_2$LB film exhibits anisotropic properly. In other words, the LB film shows angular dependence. Iodine doping affects the degree of charge transfer and the conductivity of the films. The UV/visible absorption spectra of the LB film doped with I$_2$show peaks at near 400~430 nm and there is no dimer absorption peak. The in-plane electrical conductivity of the undoped film is approximately 4.2$\times$10$^{-6}$ S/cm.

• 한국전기전자재료학회논문지
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• 제11권8호
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• pp.628-636
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• 1998

LB layers L-$\alpha$-DLPC deposited by LB method were deposited onto n-type silicon wafer as Z-type film. Films made up of 8, 16 layers of lipid with long alkyl chain and the thickness of monolayer and multiayers was determined by ellipsometry. Ut was deposited Ag and Al onto LB layers and silicon wafer for electrode and small electrode exhibit high capacitiance and low lekage current. The C-V curves of the MLS capacitor shows very high saturation value of capacitance. And cross-sectional SEM image of MLD capacitor indicated the presence of pore with Al electrode and we found that the Ag is good for electrode metal.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.347-349
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• 1999

We have fabricated insulating thin films using p-hexadecoxyphenol(p-Hp) that was formed phenol-formaldehyde resin of crosslinked structure from reaction with formaldehyde by LB technique. For fabricated MIM device, the possibility for insulating layers of electronic were investigated by electrical properties of their LB films according to crosslinking of LB films current-voltage (I-V) properties and frequency-capacitance (C-F) characteristics. We have provided evidence for the high insulating performance of phenol-formaldehyde thin films by the LB method. Conductivity of their LB films was as follows: pure water > 1 % aq. Formaldehyde > heat treatment, in the current-voltage (I-V) characteristics. It is demonstrated that insulation properties of crosslinked p-HP LB films were improved. In capacitance-frequency properties, the heat-treated p-HP LB films for crosslinking showed a low relative dielectric constant.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1994년도 춘계학술대회 논문집
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• pp.99-102
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• 1994

The use of preformed polymers and their cross-linking have been a attempted in order to improve the intrinsic fraqility of monolayers and Langmuir-Blodgett (LB)films and to make their technological applications possible. It has shown that an imidization followed a polyion-complexation can stabilize the LB films against heat and solvents. And when the polymer structure was properly designed concurrent removal of the alkyl tails together with imide formation could be accomplished. In this paper we present a characteristic monolayer behavior of polymer with pendent polythers and carboxyls it’s polyion-complexed LB film with subphase polymer PAA and a possible skeletonization of the LB film by thermal imidization. Also deposition status of LB films are evaluated by using QCM

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.831-834
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• 2000

Characteristics of organic light-emitting diodes(OLEDs) were studied with devices made by PECCP[poly(3,6-N-2-ethylhexyl carbazolyl cyanoterephthalidene)] Langmuir-Blodget(LB) films. The emissive organic material was synthesized and named PECCP, which has a strong electron donor group and an electron accepter group in main chain repeated unit. The LB technique was employed to investigate the identification of the recombination zone in the ITO/PECCP LB films/Alq$_3$/Al structure by varying the LB film thickness. PECCP was considered as an emissive layer and Alq$_3$was used as an electron-transport layer. We measured current-voltage(I-V) characteristics, UV/visible absorption, PL spectrum, and EL spectrum of those devises.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1993년도 추계학술대회 논문집
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• pp.105-108
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• 1993

Behavior of electron in polyimide LB films of Al/polyimide LB films/Au (MIM) structures is reported in the present paper. From experimental results, it is known that there is a process where electron moves from Au electrode to Al electrode through LB film. And the electrons are presumed to move by diffusion since the direction is opposite to electric field.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.136-138
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• 2005

Merocyanine dye (MD) has been extensively investigated due to its marked potential application to photo-electric devices. We fabricated the number of layers to control its optical characteristics using the Langmuir-Blodgett (LB) method. We evaluated the morphology and optical characteristics of MD LB films using Atomic Force Microscopy (AFM) and UV spectroscopy, PL spectroscopy. As a result, we obtained the quantitative morphology and optical characteristics of LB films from controlling the deposided layers.

• 한국도로학회논문집
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• 제8권1호
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• pp.89-98
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• 2006

오르막차로 설계에 쓰이는 표준트럭의 중량/마력비는 200 lb/hp로 알려져 있다. 그 값은 일반적으로 다양하기 마련인 지역간 트럭의 분포를 일정하다고 간주하여 트럭의 성능을 한가지로 표준화시킨 값이다. 또한 실제 교통량 중에서 트럭구성비를 측정하기보다는 그동안 전국범위의 트럭 등록대수 기준으로 표준트럭화 시킨 값이다. 따라서 표준트럭의 중량마력비는 지역적 산업적 트럭의 다양성이나 실제 트럭분포와 거리가 있다고 할 수 있다. 이러한 문제를 해결하기 위하여 본 논문에서는 실제 트럭 구성비에 지역특성을 반영한 다양한 표준트럭의 중량마력비에 대해 검토하였다. 본 논문을 위해 전국에 걸쳐 고속도로 요금소에서 측정한 개별트럭의 중량마력비를 사용하였다. 지역적 분석을 위해 전국 8개 지역으로 나누고, 지역별 중량/마력비를 특성화하여 현재 단일기준의 지역별 적용성을 검토하였다. 분석결과 전국의 표준트럭은 208 lb/hp로 현재의 200 lb/hp와 8 lb/hp 차이가 나며, 지역별로 분석한 결과 170 lb/hp $\sim$ 230 lb로 현재 기준과 30 lb/hp 내외의 차이가 나는 것으로 나타났다. 그 결과로 지역별 트럭분포의 격차가 있음을 확인할 수 있었고 전국적인 지역특성을 반영한 세가지의 중력마력비가 제안될 수 있었다. 다양한 표준트럭이 설계에 반영이 되면 두가지 효과가 기대된다. 즉 트럭과 승용차의 오르막차로에서의 속도차 때문에 발생하는 추돌사고를 줄이고 또한 특정지역에서 오르막차로 건설비를 줄이는 것이 가능할 것으로 생각된다.

• 한국미생물·생명공학회지
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• 제39권2호
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• pp.175-181
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• 2011

Kimchi is a group of traditional fermented vegetable foods in Korea and known to be the product of a natural mixed-fermentation process carried out principally by lactic acid bacteria (LAB). According to microbial results based on conventional identification, Leuconostoc mesenteroides and Lactobacillus plantarum were considered to be responsible for the good taste and over-ripening of kimchi, respectively. However, with the application of phylogenetic identification, based on 16S ribosomal RNA gene similarities, a variety of Leuconostoc and Lactobacillus species not detected in the previous studies have been isolated, together with a species in the genus Weissella. Additionally, Lactobacillus sakei has been accepted as the most populous LAB in over-ripened kimchi. In this study, Leuconostoc and Weissella species inhibiting the growth of Lb. sakei were isolated from kimchi for future applications to do with kimchi fermentation. From 25 kimchi samples, 378 strains in the genera Leuconostoc and Weissella were isolated and 68 strains identified as Lc. mesenteroides, Lc. citreum, Lc. lactis, W. cibaria, W. confusa, and W. paramesenteroides exhibited growth inhibition against Lb. sakei. Most of the strains also had antagonistic activities against Lb. brevis, Lb. curvatus, Lb. paraplantarum, Lb. pentosus, and Lb. plantarum. Their antagonistic activities against Lb. sakei were more remarkable at lower temperatures of incubation.