• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1394-1397
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• 2005

Hyundai LCD Inc. and LUXELL Technologies Inc. have jointly developed a 1.5" passive matrix full color OLED display ($132{\times}RGB{\times}96$, 111ppi) with characteristics of enhanced contrast ratio using black layer technology. This prototype ECR OLED was fabricated with the structure of ITO/HIL/HTL/RGB EML/HBL/ETL/LiF/Black Layer/Cathode and showed significant improvement of contrast ratio comparing with that of non-filtered OLED as well as compatible with circular polarizer OLED

• Macromolecular Research
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• 제13권3호
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• pp.194-205
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• 2005

The network structure of Ni-coated carbon black (NCB) composites filled with phenolic resin was investigated by means of using scanning electron microscopy, viscosity, interfacial tension, shrinkability, Flory-Huggins interaction parameters, and swelling index. The electrical properties of the composites have been characterized by measurement of the specific conductivity as a function of temperature. Additionally, the variation of conductivity with temperature for the composites has been reported and analyzed in terms of the dilution volume fraction, relative volume expansion, and barrier heights energy. The thermal stability of phenolic-NCB composites has been also studied by means of the voltage cycle processes. The experimental data of EMI wave shielding were analyzed and compared with theoretical calculations. The mechanical properties such as tensile strength, tensile modulus, hardness and elongation at break (EB) of NCB-phenolic resin composites were also investigated.

• Elastomers and Composites
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• 제33권5호
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• pp.355-362
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• 1998

전도성 충전제인 카본블랙이 미치는 영향을 올바로 이해하므로서 전도성 카본블랙을 충전하여 도전성 고분자 복합재료를 제조하고자 하였다. 고분자 수지로 ABS(Acrylonitrile Butadiene Styrene copolymer), PC(Polycabonate), PC/ABS 를 사용하여 전도성 카본블랙 3종류를 사용하여 비교하였다. 실험결과 섬유사슬모양의 전도성 카본블랙을 충전한 PC는 상당히 가능성을 보였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.223-223
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• 2007

Thermal and mechanical properties were investigated in several semi-conductive materials which is composed of carbon black and polymer. EVA, EEA, and EBA is normally used for matrix polymer and normally acetylene black and furnace black is used. Isothermal thermo gravimetric analysis is done as a function of atmosphere and temperature. In nitrogen atmosphere semicon compound was slowly degradaded but in ambient condition degradaded fast. So in the cable manufacturing, atmosphere and materials are very important.

• 한국식품과학회지
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• 제46권2호
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• pp.198-204
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• 2014

다양한 베리류인 복분자, 블루베리(재배종), 블루베리(야생종), 블랙초크베리 및 오디의 inflammatory cytokines 발현 억제효과, MMP-1 발현 억제활성 그리고 ROS 생성 저해효과를 비교해보았다. Inflammatory cytokines 발현 억제효과 비교에서 복분자와 블루베리(재배종)의 TNF-${\alpha}$ 억제활성이 가장 뛰어났고, IL-6의 경우 블랙초크베리, 블루베리, 복분자 순으로 inflammatory cytokines의 발현 억제 효과를 보여주었다. 또한 블랙초크베리, 블루베리(야생종), 복분자가 IL-8의 발현을 눈에 띄게 억제 하였다. 더불어 복분자와 오디의 inflammatory cytokines 발현 억제에 대해 시너지 효과가 있는지 여부를 확인하기 위해 복분자와 오디를 각각 $250{\mu}g/mL$씩 함께 처리한 결과 복분자 $250{\mu}g/mL$과 오디 $250{\mu}g/mL$의 농도로 동시에 처리할 경우, 복분자와 오디를 각각 500 ${\mu}g/mL$로 처리한 그룹에 비해 시너지 효과를 보이지 않았지만 오디만을 처리했을 때보다는 염증성 사이토카인의 발현이 감소됨을 확인하였다. 또한 베리류 착즙액을 처리한 모든 그룹에서 MMP-1 mRNA의 발현이 현저하게 감소되었고, 그중에서도 특히 블루베리(야생종)의 효과가 가장 탁월하였다. 복분자($250{\mu}g/mL$)와 오디($250{\mu}g/mL$)를 동시에 처리한 그룹과 복분자 또는 오디를 각각 500 ${\mu}g/mL$로 처리한 그룹을 비교해본 결과, 복분자와 오디를 동시에 처리한 그룹이 복분자와 오디만을 각각 처리한 그룹보다 MMP-1 mRNA의 발현이 좀 더 감소하는 효과를 보여주었다. ROS 생성저해 효과를 비교한 결과, 블랙초크베리가 가장 뛰어났고 그 다음으로 복분자, 블루베리(재배종)의 순으로 두 착즙액의 ROS 생성 저해 효과가 비슷한 것으로 나타났다. 그러나 복분자 $250{\mu}g/mL$과 오디 $250{\mu}g/mL$의 농도로 동시에 처리그룹의 경우 ROS 생성에 대한 시너지 억제효과를 보이지 않았다. 이상의 결과들로부터 다섯 가지 베리류 즉, 복분자, 블루베리(재배종), 블루베리(야생종), 블랙초크베리 및 오디의 inflammatory cytokines 과 MMP-1 mRNA 발현 및 ROS 생성에 대한 저해 효과는 각각의 베리류에서 차이를 보였으나, 다섯가지 베리류 모두 항염증, 항산화 작용을 통해 피부노화 개선에 기여할 것으로 사료된다.

• 한국수산과학회지
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• 제49권2호
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• pp.224-233
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• 2016

The objective of this study was to develop an artificial neural network (ANN) model for the acoustic identification of commercially important fish species in Korea. A broadband echo acquisition and processing system operating over the frequency range of 85-225 kHz was used to collect and process species-specific, time-frequency feature images from six fish species: black rockfish Sebastes schlegeli, black scraper Thamnaconus modesutus [K], chub mackerel Scomber japonicus, goldeye rockfish Sebastes thompsoni, konoshiro gizzard shad Konosirus punctatus and large yellow croaker Larimichthys crocea. An ANN classifier was developed to identify fish species acoustically on the basis of only 100 dimension time-frequency features extracted by the principal components analysis (PCA). The overall mean identification rate for the six fish species was 88.5%, with individual identification rates of 76.6% for black rockfish, 82.8% for black scraper, 93.8% for chub mackerel, 90.6% for goldeye rockfish, 96.9% for konoshiro gizzard shad and 90.6% for large yellow croaker, respectively. These results demonstrate that individual live fish in well-controlled environments can be identified accurately by the proposed ANN model.

• 한국전기전자재료학회논문지
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• 제25권3호
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• pp.224-228
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• 2012

We have developed new materials that lead to methyl meth acrylate monomer and styrene monomer to using polymerization method. The materials have a powder form and show liquid behavior. We call the "Electronic Bead". An our experiment, a positive-charged particle has $TiO_2$, polymer and CCA(-), while a negative-charged particle consists of carbon black, polymer and CCA(+). The charged particles have electrical characteristic of white -10 uC/g and black 10 uC/g, respectively. Also, these particles have good fluidity by additive of nano-sized silica. Using these materials, we demonstrated prototype displays that have $320{\times}320$ array of pixels and 6-in-diagonal viewable image size, driven by passive-matrix addressing. The reflectivity shows about 30% even though our experiment is at the beginning point. Also, the panel has contrast ratio 6:1. We think there are many chances to improve reflectivity through modifying components of particle resin, mixture ratio of each particle, panel structure and so on.

• 대한세포병리학회지
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• 제7권1호
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• pp.23-30
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• 1996

Chromatin texture, which partly reflects nuclear organization, is evolving as an important parameter indicating cell activation or transformation. In this study, chromatin pattern was evaluated by image analysis of the electron micrographs of follicular and papillary carcinoma cells of the thyroid gland and tested for discrimination of the two neoplasms. Digital grey images were converted from the electron micrographs, nuclear images, excluding nucleolus and intranuclear cytoplasmic inclusions, were obtained by segmentation; grey levels were standardized; and grey level histograms were generated. The histograms in follicular carcinoma showed Gaussian or near-Gaussian distribution and had a single peak, whereas those in papillary carcinoma had two peaks(bimodal), one at the black zone and the other at the white zone. In papillary carcinoma, the peak in the black zone represented an increased amount of heterochromatin particles and that at the white zone represented decreased electron density of euchromatin or nuclear matrix. These results indicate that the nuclei of follicular and papillary carcinoma cells differ in their chromatin pattern and the difference may be due to decondensed chromatin and/or matrix substances.

• Elastomers and Composites
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• 제53권3호
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• pp.150-157
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• 2018

Fatigue properties of rubber are one of the most important characteristics in the rubber industry. In this study, the fatigue properties of MREs (magneto-rheological elastomers) based on NR (natural rubber), EPDM (ethylene-propylene diene monomer), and AEM (ethylene/acrylic elastomer) were investigated. For comparison, MREs with a Shore hardness of 60A were prepared. According to the relative results, the fatigue properties of EPDM MRE were the worst. Thus, we investigated methods to improve the fatigue properties of EPDM MRE by varying the carbon black content and curing systems of EPDM as the matrix of the MRE. Dynamic properties were measured using a fatigue tester and an RPA (rubber process analyzer), and the XPS (X-ray photoelectron spectroscopy) was used to analyze the curing system of the EPDM matrix. According to the results, the Payne effect increased and the fatigue resistance decreased as the carbon black content increased. In case of the curing system, the CV (conventional vulcanization) system was superior to the EV (efficient vulcanization) system in terms of the fatigue resistance. This was because the number of flexible bonds in the case of the CV system was higher than that in the case of the EV system. However, the EV system showed excellent mechanical properties because it had many monosulfidic bonds with strong binding energy.

• 한국산학기술학회논문지
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• 제8권6호
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• pp.1376-1380
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• 2007

대전입자형 디스플레이는 높은 대조비와 넓은 시야각 그리고 빠른 응답속도를 가졌다. 본 연구에서는 음전하를 띈 노란색 대전입자와 양전하를 띈 검은색 대전입자를 사용하여 화상을 표시하였으며, 기존의 혼합된 대전입자를 충전하는 방식과는 대비 패널의 상판과 하판에 형성된 셀에 두 대전입자를 전계에 의해 각각 어드레싱하였다. 그리고 상판과 하판을 합착한 후 Aging을 하여 패키징을 하였으며, 합착된 패널은 전극 설계에 의해 4 채널의 전극에 Matrix 구동을 했다. 패널에 충전되는 layer 수는 최소 2 layer가 요구되며, 본 연구에서는 대전입자의 layer는 격벽의 높이로 조절하였다. 패키징된 패널의 상판에 양의 전압을 인가한 결과, 노란색 대전입자는 상판의 전극으로 이동하고 검은색 대전입자는 하판의 전극으로 이동하였다.