• 자원환경지질
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• 제42권6호
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• pp.549-559
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• 2009

연구 목적은 미생물기원으로 추측되는 나선형구조물과 협막구조물에 형성된 침철석과 레피도크로사이트의 광물화작용, 그리고 철수산화물 중에 함유된 중금속함량의 특성을 해석하고자 하였다. 오염된 지하수와 비오염된 지하수의 Cl과 Br의 함량 그리고 Cl/Br의 비율을 이용하여 본 지하수의 오염 정도를 비교해본 결과 인간 활동에 의하여 오염이 진행된 것으로 나타났다. 황갈색 철수산화물을 구성하는 주성분은 $Fe_2O_3$와 $SiO_2$로 나타났다. $Fe_2O_3$ 함량은 58.57wt.%에서 75.73 wt.% 범위이고, $SiO_2$ 함량은 5.8 wt.%에서 16.17 wt.% 범위로 나타났다. 황갈색 철수산화물에 고 함량으로 함유된 중금속원소는 Zn(최대 6,160 mg/kg), Pb(최대 377 mg/kg), U(최대 503 mg/kg), Cr(최대 203 mg/kg) Cu(최대 77 mg/kg), V(최대 162 mg/kg) 및 Ni(최대 105 mg/kg) 등이다. 래스상과 엽편상의 결정들 그리고 침상의 결정들이 나선형구조물과 협막구조물에 발달 돤 것이 관찰되었다. 황갈색 철수산화물에 대한 x-선 회절분석에서 침철석, 석고 및 레피도크로사이트가 관찰되었다.

• 한국농촌건축학회논문집
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• 제7권1호
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• pp.19-30
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• 2005

This study is carried out to understand the characteristic of location in vernacular agricultural villages by judging from natural environment around the village. For this purpose, there were selected 17 villages of the riverside villages in Geosan Area which lean against Dalchoen River. After classifying these samples by the morphorogical approach, according to compare them with pre-researched villages, the methodology of spatial structure was investigated in agricultural villages. As a result of the study, the relationship between the agricultural villages and the shape of Dalcheon River can be classified by 3 types that are twisted around villages, attacked villages, and paralleled with villages. First of all, twisted type is located in river terraces, river safety zone and taken a image of the riverside agricultural village. Secondary, attacked type is located in beside riffle, and taken a image of a fishing village. Finally, paralleled type is located in straightly flowing river.

• 한국광학회지
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• 제19권1호
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• pp.48-53
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• 2008

본 논문에서는 $90^{\circ}$ 꼬인 네마틱 액정 셀에 전계를 인가하지 않았을 때 어두운 상태를 나타내는 normally black 모드 구현 시, 높은 명암비를 제공하는 광학구조를 제안하였다. 제안된 구조에서 +A 필름과 ${\lambda}/2$ 필름을 각각 1 장씩 사용하여 $90^{\circ}$ 꼬인 액정층을 통과한 빛의 가시광 파장대에서 편광 상태가 거의 동일하게 만들어 줌으로써, 어두운 상태의 분광특성을 향상시킬 수 있다. PSD(Parameter Space Diagram) 방법을 사용하여 최적조건을 구해 계산한 결과 500: 1 이상의 높은 명암비를 확보할 수 있었으며, 어두운 상태뿐만 아니라 밝은 상태의 분광특성도 향상됨을 시뮬레이션 및 실험을 통해 확인할 수 있었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1989년도 제2차 학술발표초록집
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• pp.69-70
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• 1989

• 자연과학논문집
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• 제16권1호
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• pp.129-141
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• 2005

The equilibrium geometry, adiabatic electron affinity, harmonic vibrational frequencies, and infrared intensities of 1,4,6,9-Tetra chlorinated dibenzo-$\rho$-dioxin anion have been studied using B3LYP method. The local minimum conformation is found to be twisted form with $D_2$ symmetry. The predicted adiabatic electron affinity is 0.54 eV. The predicted inversion barrier between twisted and planar conformers was 0.9 kcal/mol, thus we expect that experimentally observed structure seems to be planar. the characteristic IR band of 1,4,6,9-TCDD anion appears at 1510 $cm^4$, which is a benzene ring skeleton vibration mode related with CaCb and C2C3 bond. this characteristic band could be sued for identication of 1,4,6,9-TCDD anion.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.533-536
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• 2008

The anthracene derivatives were synthesized by Suzuki coupling reaction. The thermal, optical and electronic properties of MNAn and BIPAn were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry(DSC), UV-vis absorption, photoluminescen ce spectroscopies, and cyclic voltammetry. The materials exhibit high thermal stability and high per formance in EL devices.

• 한국초전도ㆍ저온공학회논문지
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• 제1권1호
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• pp.38-41
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• 1999

Strands composing multistage superconducting cables for AC power applications have twisted structure in each stage for lower AC loss and higher stability. So, when transport currents flow in a cable, each strand is exposed to longitudinal and azimuthal magnetic fields produced by transport current flowing in strand itself and Iongitudinal and transverse magnetic fields by transport current flowing in twisted cable. In this paper. we study the influence on self field lesses generated in second stage superconducting cable for different twist direction of filaments in a strand considering twist of strands in cables.

• E2M - 전기 전자와 첨단 소재
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• 제10권10호
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• pp.1011-1015
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• 1997

In this paper we investigated the electro-optical characteristics of amorphous (a)- twisted nematic (TN)-liquid crystal display(LCD) on polymide (PI) surfaces with different molecular structure. It was found that the domaine size of a-TN-LCD on PI with high polarization is small compared to a-TN-LCD on PI with medium polarization. It is considered that the response time of a-TN-LCd contributes to surface effect between the substrate surfaces and the LC molecules. Finally we obtained that the viewing angle of a-TN-LCD on PI surfaces increases with decreasing the domain size.

• Bulletin of the Korean Chemical Society
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• 제30권7호
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• pp.1611-1615
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• 2009

We designed new anthracene-based host material to increase color purity as well as device efficiency. The new blue host, 9,10-bis(2,4-dimethylphenyl)anthracene (BDA), has highly twisted structure and wide band gap due to ortho interaction between anthracene and introduced 2,4-dimethylphenyl substituents. BDA exhibited deep blue fluorescence in solution (${\lambda}_{max}$ = 410 nm) and in solid state (${\lambda}_{max}$ = 429 nm), respectively, with the wide optical band gap (E = 3.12 eV). Blue-light-emitting OLEDs using obtained host and 2% Flu-DPAN as emitter showed 8 cd/A of high efficiency as well as high color purity [CIE coordinates = (0.15, 015)].

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.611-614
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• 2003

We have investigated electric field effect on the formation of phase separated composite organic film structure which is utilized by anisotropic phase separation from LC and prepolymer mixtures. Application of bias field resulted in a significant change in liquid crystal alignment between glass substrate and polymer layer. The liquid crystal molecules segregated into the inter-electrodes and formed twisted structure which is the result of imprinting of LC alignment by the bias field on polymer layers during polymerization process.