A5021438936- Asian Industrial and Economic Development
- Cultural Industries and Urban Development
- Innovation in Digital Healthcare Systems
- Firm Innovation and Growth
- Extraction and Separation Processes
- Recycling and Waste Management Techniques
- Magnetic Properties and Synthesis of Ferrites
- Advanced Wireless Network Optimization
- Energy and Environmental Systems
- Technology and Data Analysis
- Entrepreneurship Studies and Influences
- Global trade and economics
- Indian Economic and Social Development
- Magnesium Alloys: Properties and Applications
- E-commerce and Technology Innovations
- Advanced MEMS and NEMS Technologies
- Magnetic Properties of Alloys
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Aluminum Alloy Microstructure Properties
- International Business and FDI
- Electromagnetic wave absorption materials
- Internet of Things and Social Network Interactions
- Advanced MIMO Systems Optimization
- Wireless Communication Networks Research
Korea Institute for International Economic Policy
2013-2024
Seoul National University
2022-2024
Korea Polytechnic University
2012-2021
Seoul Metropolitan Government
2011-2020
Incheon National University
2012-2020
Hansei University
2016
National Institute of Agricultural Science and Technology
2012
Jeonbuk National University
2012
Incheon Medical Center
2009
Gachon University
2009
The spinel structure of the nanosize powder (Ni 0.3 Zn Cu 0.4 Fe 2 O 4 ) substituted by Ni, Zn, and was fabricated sol-gel process. Changes in weight, crystal formation, magnetic properties were observed XRD, TG-DTA, VSM annealing process sol gel. saturation magnetization showed 54.8–58.6 emu/g at 500–800°C, gel 52.3–56.8 600–800°C. coercive force decreased range −136 Oe to −11.4 −95 −44 Therefore, deviation temperature nanopowder about 100°C.
A tunable vibratory microgyroscope was fabricated by surface micromachining technology. The 7.5 /spl mu/m-thick polysilicon structural layer deposited using LPCVD at 625/spl deg/C. resonant frequency in the detection mode higher than that driving so gyroscope could be tuned to frequencies applying inter-plate DC bias. driven a state electrostatic force and detected output due capacitance change between plate electrode. of direction were measured 10.48 kHz 10.93 kHz, respectively. shifted...
In 2009, a survey of 177 samples fish and fishery products from the markets in Seoul was carried out to investigate total mercury organic (methylmercury) concentrations establish correlation, if any, between levels. Concentrations canned tuna ranged 0.001-2.581 0.003-1.307 mg/kg, respectively; those for fish, such as cod or salmon, 0.012-2.529 0.021-0.507 respectively. Ethylmercury not detected. More than 50% existed mercury. The correlation coefficients (r(2)) methylmercury found have were...
With the concept of “creative economy” emerging as a new paradigm economic growth in Korea, frequency debates over related topics are being held, including meaning and aims concept, well policy measures needed to realize it. While there is no consensus yet on creative economy, it generally understood referred system where creativity plays central role. It already accepted many countries. This report analyzes cases from United Kingdom, Finland, Germany, Japan, Singapore, debate at Nations...
Pressure−composition isotherms are obtained for carbon dioxide (CO2)−hexyl acrylate and CO2−hexyl methacrylate systems at 40, 60, 80, 100, 120 °C pressure up to 189 bar. The exhibit type I phase behavior with a continuous mixture critical curve. Three-phase, liquid−liquid−vapor equilibrium was not observed these conditions. experimental results mixtures modeled using the Peng−Robinson equation of state. A good fit data is state two adjustable parameters systems. Experimental cloud-point 200...
According to the Fire Statistics Yearbook of National Agency Republic Korea, total number fires in 2018 was 42,338, which resulted 2500 victims and amounted property damages approximately 560 billion KRW. The buildings where wood used as a finishing material 28,013 (66%) that period. To minimize human damage, composite materials were prepared by mixing particles with expandable graphite. physical thermal properties investigated. It observed expansion rate increased 341.7% according graphite...
Used mainly in industries manufacturing secondary battery, display, LED, semiconductor, and other state-of-the-art products, rare earth elements (REEs) remain demand such has increased drastically. However, due to the lack of alternative materials recycling technologies for REEs, many countries encounter difficulty acquiring REEs. As part efforts secure some studies have developed wet process techniques material flow process, particularly scrapping disposal. Among these techniques, agent...
화학농약과 화학비료를 사용하지 않는 친환경 구기자 재배지에서 해충의 피해가 증가하고 있다. 이에 충남청양군 일원 2년간 발생상을 조사하고 주요 해충에 대한 방제제의 효과를 시험하였다. 구기자나무의 초엽기인 5월 하순과 6월 초순에는 복숭아혹진딧물(Myzus persicae)이 심하며, 중순부터는 열점박이잎벌레(Lema decempunctata)의 심하고, 구기자혹응애(Eriophys macrodonis), 큰이십팔점박이무당벌레(Henosepilachna vigintioctomaculata), 뿔나방류(Hedma spp.)의 피해는 연중 계속되었다. 열매가 열리는 7월 하순부터는 열매를 흡즙하는 노린재류의 밀도가 급증하여 심해지는데, 특히 갈색날개노린재(Plautia stali)와 썩덩나무노린재(Halyomorpba balys) 의 점차 증가하게 된다. 구기자의 해충인 복숭아혹진딧물, 열점박이잎벌레, 구기자혹응애에 친환경유기농자재의 효과에서는 고삼, 멀구슬나무, 양명아주,...
The magnetic properties of the U-type ferrite synthesized by a sol-gel process had studied substituting cobalt with manganese or zinc in cobalt-based ferrite.The substituted showed dominant crystal structure at different substitution ratio and zinc.The change starting temperature formation according to substitutional elements was confirmed TG-DTA analysis.In case substitution, lowered, on contrary, when substituted, it became higher.The tendency that saturation magnetization decreased...
With the rapid deployment of present-day mobile communication systems, user traffic requirements have increased tremendously. An ultra-dense network is a configuration in which density small base stations greater than or equal to that equipment. Ultra-dense networks are considered as key technology for 5th generation they can improve link quality and increase system capacity. However, an network, densely positioned, so one equipment may receive signals from two more stations. This cause...
본 논문에서는 8VSB 기반의 DTV 방송시스템에서 동일 채널 중계기에 적용 가능한 등화기 알고리즘에 대해 분석하고, 이를 통해 궤환신호에 의한 에러 전파를 감소 시키는 동시에, 수신 성능을 향상 시킬 수 있는 구조를 제안한다. 궤환 신호의 효율적 제거 여부를 확인하기 위하여 LMS (Least Mean Square) DFE (Decision Feedback Equalizer) 와 Correlation 등의 알고리즘 분석을 통해, 이와 연동할 다중레벨의 상관 기법을 제안하고, 기존 방식들과 비교해 봄으로써 효율적으로 에러전파 현상을 크게 것을 확인할 있었다. 컴퓨터 모의실험 수행시, 방송 시스템 환경에 널리 사용되는 브라질 모델을 적용하여 알고리즘을 서로 비교 분석하여 그 결과를 도출하였다. 동작 SNR 값인 15~25dB 까지 범위에서의 심볼 에러율 및 MSE (Mean Square Error) 등을 살펴보았다. 기존의 결과 제안방식이 동일한 비트 오류 정정 유지하는데...
<p>A floating bridge differs from conventional bridges in that both wind and wave loads act as primary dynamic loads. The nonlinear interaction between the body's hydrodynamic response deck's aeroelastic can significantly affect entire system. However, existing commercial software lacks capability to perform fully coupled aero-hydrodynamic analysis. Therefore, this study introduces a time-domain analysis module for structures implemented through ABAQUS User Subroutine. Validation of...
인듐은 1863 년 독일의 F. Reich과 H. T. Richter에 의해 발견되었다. 그들은 탈륨을 검출하기 위해 독일 프라이부 르크 아연 광의 제련 잔재를 스펙트럼 분석했는데, 과거에 보고되지 않은 미지의 원소의 패턴을 발견했다. 발 견된 스펙트럼의 색깔은 짙은 남색(Indigo:라틴어에서 Indicum)이며, 이것을 따서 인듐(Indium)이라고 명명되었다. 인듐(In)은 아연(Zn), 동(Cu), 철(Fe), 주석(Sn), 니켈(Ni) 및 납(Pb)의 황화합물/황염광물을 제련하는 과정 중 발생 하는 잔류물(Residue), Fume, Dust, Slag 처리 찌 꺼기(Dross)를 처리하는 과정에서 갈륨(Ga), 은(Ag) 금 (Au)과 함께 부산물의 형태로 생산된다. 이들 잔류물, 찌꺼기로부터 금속원소를 회수하 기 위해서는 황산이나 염산 등의 강산을 활용한 Leaching 공정을 주로 사용된다. 최초로 인듐을 상업적으로 사용한 예는 1933년 미국에 서 인듐이...
With the Indo-Pacific region increasingly gaining recognition for its strategic im-portance, countries such as China, Japan, and India are seeking close economic cooperation with South Asian countries. This report analyses these countries' perspectives policies towards Asia (Pakistan, Bangladesh, Sri Lanka) under rapidly changing international political environment, examines Korea's future strategies policies. has mainly focused on ODA. Although trade investment have been centered some...
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2023년 서울시 유통 오프라인 매장과 온라인 구매를 통하여 캠핑용 조리기구 및 식기 11품목 174건을 대상으로 유해 중금속용출 특성을 검사하였으며 재질별로는 금속제 127건, 합성수지제 47건이었다. 금속제에는 스테인리스 85건, 알루미늄 37건, 티타늄 5건이었으며, 합성수지제에는 폴리프로필렌 43건, 불소수지 4건이었다. 검체를 원산지별로 구분하면 국산 45건, 수입산 129건이었고 수입국은 중국이 121건으로 가장 많았다. 유통경로별 검체는 수거가 71건, 수거는 103건이었다. 수거 제품 중 33건은 해외직구 제품이었다. 수거된 검체의 재질기준은 식품용 기구 용기·포장 공전에 따라 식품과 직접 접촉하는 면의 해당 재질로 실험하였다. 납의 평균 용출량과 용출량 범위는 0.001 (ND-0.005) mg/L, 카드뮴의 0.000 (ND-0.001) 비소의 (ND-0.017) 니켈의 0.014 (ND-0.161) 6가크롬의 (ND-0.010) mg/L이었다. 합성수지제의...