• Title/Summary/Keyword: Competitive Layer

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An Electrochemical Enzyme Immunochip Based on Capacitance Measurement for the Detection of IgG

  • Yi, Seung-Jae;Choi, Ji-Hye;Kim, Hwa-Jung;Chang, Seung-Cheol;Park, Deog-Su;Kim, Kyung-Chun;Chang, Chulhun L.
    • Bulletin of the Korean Chemical Society
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    • v.32 no.4
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    • pp.1298-1302
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    • 2011
  • This study describes the development of an electrochemical array immunochip for the detection of IgG. Interdigitated immunochip platforms were fabricated by sputtering gold on a glass wafer by using MEMS process and then were coated with Eudragit S100, an enteric polymer, forming an insulating layer over the working area of immunochips. The breakdown of the polymer layer was exemplified by the catalytic action of urease which, in the presence of urea, caused an alkaline pH change. This subsequently caused an increase of the double layer capacitance of the underlying electrode. Used in conjunction with a competitive immunoassay format, this allowed the ratio of initial to final electrode capacitance to be directly linked with the concentration of analyte, i.e. IgG. Responses to IgG could be detected at IgG concentration as low as $250\;ngmL^{-1}$ and showed good linearity up to IgG concentration as high as $20\;{\mu}gmL^{-1}$.

SI(superconductor-insulator) Transitions in Bi-superconducting Mixed Crystal Thin Films

  • Park, No-Bong;Yang, Sung-Ho;Park, Yong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.486-489
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    • 2002
  • Temperature(T) dependence of the sheet resistance( $R_{$\square$}$) has been investigated on the c-axis oriented thin films of the (Bi2212/Bi2201) mixed crystal with different molar fractions. The $R_{$\square$}$-T superconducting characteristic deteriorated with reduction of the Bi2212 fraction, and almost disappears at 48 mol% where a superconductor-to-insulator transition took place, with the resistance on the normal state, RN, reaching 4.l㏀ at 80 K. This $R_{N}$ value is close to the universal quantum number, h/(2e)$^2$≡6.5㏀ predicted by the Kosterlitz-Thouless(KT) transition theory. The $R_{$\square$}$-T characteristics of the 48 mol% thin film can be elucidated as a competitive process of KT transition brought about by charge or vortex in the two-dimensional layer structure.e.

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Sl Transitions in BSCCO Mixed Crystal Thin Films

  • Ahn, Joon-Ho;Yi, Keon-Young;Park, Yong-Pil
    • Transactions on Electrical and Electronic Materials
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    • v.3 no.2
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    • pp.20-23
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    • 2002
  • Temperature (T) dependence of the sheet resistance (R$\_$$\square$/) has been investigated an the c-axis oriented thin films of the (Bi2212/Bi2201) mixed crystal with different molar fractions. The R$\_$$\square$/-T superconducting characteristic deteriorated with reduction of the Bi2212 fraction, and almost disappears at 48 mol% where a superconductor-to-insulator transition too k place, with the resistance on the normal state, R$\_$N/, reaching 4.1 kΩka at 80 K. This R$\_$$\square$/ value is close to the universal quantum number, h/(2e)$_2$≡ 6.5 kΩ predicted by the Kosterlitz-Thouless (KT) transition theory. The R$\_$$\square$/-T characteristics of the 48 mol% thin film can be elucidated as a competitive process of KT transition brought about by charge or vortex in the two-dimensional layer structure.

Development of Rapid Prototyping Technique using Sheet Metal and Projection Welding (금속박판과 프로젝션 용접을 이용한 쾌속 조형법의 개발)

  • 이상찬;최진호
    • Journal of Welding and Joining
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    • v.22 no.2
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    • pp.46-50
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    • 2004
  • In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs fur the product development. Since first emerged in 1986, Rapid Prototyping (RP) technology has helped successfully to reduce time and costs. Recently, RP using functional materials such as metal has been researched. However RP using the molten metal has been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish, post finishing, etc., that originate primarily from the overall deposition of molten metal for each layer. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. Also tensile and bending specimens were made by the developed RP process using projection welding and were verified.

A Basic Study on Electrification Phenomena of Synthetic Polymer Material (합성고분자재료의 대전현상에 관한 기초연구)

  • 이덕출;한상옥
    • 전기의세계
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    • v.28 no.10
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    • pp.48-54
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    • 1979
  • The electrification phenomena of polymerized materials is governed by the competitive processes of the charge generation and the charge dissipation. In this paper, The charged particles were supplied on the naked upper surface of the polyethylene film from a point corona discharge with a screen electrode which controls the potential difference across the film. The charging current with the corona charging was found to be larger than that obtained with the electric charging on the MIM structure and the discharge current was found to flow in the same direction as that of the charging current. these results can suggest that the charge injection occurs from the interface between the polethylene surface and the accumulated charge layer, the injected charge are trapped and the space charge is established.

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Properties of CNT field effect transistors using top gate electrodes (탑 게이트 탄소나노튜브 트랜지스터 특성 연구)

  • Park, Yong-Wook;Yoon, Seok-Jin
    • Journal of Sensor Science and Technology
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    • v.16 no.4
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    • pp.313-318
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    • 2007
  • Single-wall carbon nanotube field-effect transistors (SWCNT FETs) of top gate structure were fabricated in a conventional metal-oxide-semiconductor field effect transistor (MOSFET) with gate electrodes above the conduction channel separated from the channel by a thin $SiO_{2}$ layer. The carbon nanotubes (CNTs) directly grown using thin Fe film as catalyst by thermal chemical vapor deposition (CVD). These top gate devices exhibit good electrical characteristics, including steep subthreshold slope and high conductance at low gate voltages. Our experiments show that CNTFETs may be competitive with Si MOSFET for future nanoelectronic applications.

A Basal Cell Carcinoma Classifier with an Ambiguous Category (모호한 카테고리를 도입한 기저 세포암 검출기)

  • Park, Aa-Ron;Min, So-Hee;Baek, Seong-Joon;Na, Seung-Yu
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.261-262
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    • 2006
  • According to the previous work, various well known methods including maximum a posteriori probability classifier (MAP) and multi layer perceptron networks classifier (MLP) showed competitive results. Since even the small errors often leads to a fatal result, we investigated the method that reduces classification error perfectly by screening out some ambiguous patterns. Those ambiguous patterns can be examined by routine biopsy. We incorporated an ambiguous category in MAP and MLP. Classification results involving 216 spectra gave 100% sensitivity for the case of MLP.

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Lightweight Residual Layer Based Convolutional Neural Networks for Traffic Sign Recognition (교통 신호 인식을 위한 경량 잔류층 기반 컨볼루션 신경망)

  • Shokhrukh, Kodirov;Yoo, Jae Hung
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.1
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    • pp.105-110
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    • 2022
  • Traffic sign recognition plays an important role in solving traffic-related problems. Traffic sign recognition and classification systems are key components for traffic safety, traffic monitoring, autonomous driving services, and autonomous vehicles. A lightweight model, applicable to portable devices, is an essential aspect of the design agenda. We suggest a lightweight convolutional neural network model with residual blocks for traffic sign recognition systems. The proposed model shows very competitive results on publicly available benchmark data.

Development of Advanced Polymeric Binders for High Voltage LiNi0.5Mn1.5O4 cathodes in Lithium-ion batteries (고전압 LiNi0.5Mn1.5O4 양극 고성능 바인더 개발 연구)

  • Dae Hui Yun;Sunghun Choi
    • Journal of Industrial Technology
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    • v.43 no.1
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    • pp.43-48
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    • 2023
  • Spinel LiNi0.5Mn1.5O4 (LNMO) has been considered as one of most promising cathode material, because of its low-cost and competitive energy density. However, 4.7V vs. Li/Li+ of high operating potential facilitates electrolyte degradation on cathode-electrolyte interface during charge-discharge process. In particular, commercial polyvinylidene fluoride (PVDF) is not sutaible for LNMO cathode binder because its weak van der waals force induces thick and non-uniform coverage on the cathode surface. In this review, we study high performance binders for LNMO cathode, which forms uniform coating layer to prevent direct contact between electrolyte and LNMO particle as well as modifying high quality cathode electrolyte interphase, improved cell performace.

Export Strategies Against Decreasing Demand of Fukushima's Agricultural Porducts (후쿠시마산(産) 농산물 수요감소에 대비한 농산물 수출전략)

  • Hong, Gil-Jong
    • Asia-Pacific Journal of Business
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    • v.9 no.2
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    • pp.105-121
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    • 2018
  • In 1995, the WTO started to ease the trade barriers. Globalization has accelerated. The opening of the agricultural products market is rapidly gaining momentum with the conclusion of an FTA. The acceleration of this FTA is expected to be a threat to Korea's agriculture, and a new strategy is needed. At the beginning of the nuclear accident, mainly radioactive materials are found in the surface layer of the soil. Over time, the concentration of the plant gradually increases. After 5 years, it becomes noticeable. In March 2016, it will be five years after the nuclear accident. Radioactive contamination is very likely to occur in agricultural products produced in the Fukushima area at this time. In this period, agricultural products produced in the Fukushima region are expected to generate supply disruptions in Japan, and imports to replace them will increase. Therefore, it is necessary to establish a mid- and long-term strategy for exporting to Japan by analyzing the competitiveness of Korean agricultural products. In this study, standardization index was derived by using agricultural price ratio, TSI, export CAC. Based on this, we analyzed the competitiveness of each item in the Japanese market. The analysis shows that garlic is the most competitive product in the Japanese market. Also, strawberry, tomato, and cucumber were found to be competitive. On the other hand, Kiwi, pineapple, soybean, onion, potato, etc. As a result of the analysis, the following strategies were proposed for the export of agricultural products with high competitiveness. First, it is necessary to develop technology to suppress deterioration of export transportation quality. Second, continuous supply of local consumption pattern information is required. Third, it is necessary to expand exports by processing fresh food. Fourth, it suggested the establishment of export base and strengthening of support system.

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