• 제목/요약/키워드: Hall Effect

검색결과 877건 처리시간 0.051초

초고층 주거용 건물에서의 연돌효과 영향 분석 (Analysis of the Impacts of Stack Effect in High-rise Residential Buildings)

  • 양인호;조재훈;김광우;여명석
    • 한국주거학회논문집
    • /
    • 제13권4호
    • /
    • pp.61-66
    • /
    • 2002
  • The objectives of this study are to clarify the impacts of stack effect in high-rise residential buildings and to present technical methods to reduce stack effect. For the evaluation of stack effect, architectural design guidelines were used and computer program simulations based on network model were performed. The evaluation shows that problems due to stack effect may be reduced by appropriate architectural designs, such as increase in air-tightness of building envelop, and provision of vestibules around entrance and elevator hall doors.

동일한 전극 표면적에서 DBD방전형 내부전극 형상에 따른 오존생성특성 연구 (Ozone Production Characteristics of the DBD Discharge the Electrode Shape at the Same Electrode surface area)

  • 권영학;박현미;송현직;박원주
    • 조명전기설비학회논문지
    • /
    • 제30권2호
    • /
    • pp.71-77
    • /
    • 2016
  • The dielectric barrier discharge (DBD) has low efficiency due to about 70% input power is consumed as thermal energy in the discharge space. However, because of the usage of DBD ozone generator is easier than other methods. The DBD ozone generator has been widely applied for high concentration ozone generation in the industrial application. But, the low-capacity compact DBD ozone generator is not applied so far. Therefore, the DBD ozone generator is necessary to improve ozone production efficiency and reduce the capacity. In this paper, the stainless steel pipe inner electrode was designed with hall type and screw type to improve the ozone production yield. The manufactured two inner electrodes were experimented with normal type for comparison of the discharge characteristics and the ozone generating characteristics. As the experimental results, the discharge current effective value of designed inner electrodes with hall type and screw type are higher than the normal type, due to unequal electric field is formed at the boundary. However, the difference of designed and original electrodes is less than 0.1mA that has no effect on the discharge characteristic. On the other hand, the screw type inner electrode increased higher than original model about 7 times when the flow rate of the oxygen source gas was increased from $0.6{\ell}/min$ to $1.0{\ell}/min$ The reason was assumed by the flow rate of the raw gas through the inner electrode was became fast that has a cooling effect. The designed hall type and screw type inner electrodes have shown good performances in ozone generation and ozone production that better than normal type in the same electrode surface area.

우주추진용 홀방식의 전기추력기를 위한 제논연료공급장치 개발 (Development of Xenon Feed System for a Hall-Effect Thruster to Space-propulsion Applications)

  • 김연호;강성민;정연황;선종호;위정현;윤호성;최원호;이종섭;서미희
    • 한국항공우주학회지
    • /
    • 제39권1호
    • /
    • pp.84-89
    • /
    • 2011
  • 소형인공위성의 우주추진체로 사용될 홀방식 전기추력기의 서브시스템으로 제논연료공급장치가 개발되었다. 제논연료공급장치는 연료저장탱크에서 추력기의 양극과 음극에 낮은 압력으로 연료를 공급하게 된다. 추력기는 양극과 음극에서 독립적으로 정밀한 연료의 유량제어를 요구하고 있다. 연료의 유량은 양극과 음극에 각각 위치한 오리피스와 차단밸브를 통해 축압탱크의 압력을 변경함으로서 조절된다. 본 논문은 제논연료공급장치의 부품선정을 포함한 설계와 성능검증 및 기능시험에 대한 내용을 다루고 있다.

PLD 기법으로 성장된 n형 TiO2에서 Nb 도너의 활성화 에너지 (The activation Energy of the Niobium donor in n-type TiO2 film grown by Pulsed Laser Deposition)

  • 배효정;하준석;박승환
    • 마이크로전자및패키징학회지
    • /
    • 제21권4호
    • /
    • pp.41-44
    • /
    • 2014
  • 본 연구에서는 $TiO_2$에 나이오븀 (Nb) 도펀트가 주입되었을 때의 활성화 에너지를 홀 효과 측정 시스템과 온도에 따른 photoluminescence (PL) 실험을 통하여 살펴보았다. Nb 이 도핑 된 n형 아나타제 $TiO_2$ 박막은 pulsed laser deposition (PLD) 기법으로 $SrTiO_3$기판에 성장되었다. 측정 결과, Nb 도너의 활성화 에너지 값은 홀 효과 측정에서는 14.52 meV, PL 측정에서는 6.72 meV로 다소 차이를 보였다. 이 결과는 기존의 어셉터 물질의 활성화 에너지들과는 차이를 나타내고 있으며, 향후 본 연구와 같은 shallow 도너 준위의 활성화 에너지 연구에 대한 더 많은 연구가 필요할 것으로 판단된다.

Development of the Caliper System for a Geometry PIG Based on Magnetic Field Analysis

  • Kim, Dong-Kyu;Cho, Sung-Ho;Park, Seoung-Soo;Yoo, Hui-Ryong;Park, Yong-Woo;Kho, Young-Tai;Park, Gwan-Soo;Park, Sang-Ho
    • Journal of Mechanical Science and Technology
    • /
    • 제17권12호
    • /
    • pp.1835-1843
    • /
    • 2003
  • This paper introduces the development of the caliper system for a geometry PIG (Pipeline Inspection Gauge). The objective of the caliper system is to detect and measure dents, wrinkles, and ovalities affect the pipe structural integrity. The developed caliper system consists of a finger arm, an anisotropic permanent magnet, a back yoke, pins, pinholes and a linear hall effect sensor. The angle displacement of the finger arm is measured by the change of the magnetic field in sensing module. Therefore the sensitivity of the caliper system mainly depends on the magnitude of the magnetic field inside the sensing module. In this research, the ring shaped anisotropic permanent magnet and linear hall effect sensors were used to produce and measure the magnetic field. The structure of the permanent magnet, the back yoke and pinhole positions were optimized that the magnitude of the magnetic field range between a high of 0.1020 Tesla and a low of zero by using three dimensional nonlinear finite element methods. A simulator was fabricated to prove the effectiveness of the developed caliper system and the computational scheme using the finite element method. The experimental results show that the developed caliper system is quite efficient for the geometry PIG with good performance.

Rutile Ti1-xCoxO2-δ p-type Diluted Magnetic Semiconductor Thin Films

  • Seong, Nak-Jin;Yoon, Soon-Gil;Cho, Young-Hoon;Jung, Myung-Hwa
    • Transactions on Electrical and Electronic Materials
    • /
    • 제7권3호
    • /
    • pp.149-153
    • /
    • 2006
  • An attempting to produce a p-type diluted magnetic semiconductor (DMS) using $Ti_{1-x}Co_xO_{2-\delta}-based$ thin films was made by suitable control of the deposition parameters including deposition temperature, deposition pressure, and doping level using a pulsed laser deposition method. T$Ti_{0.97}Co_{0.03}O_{2-\delta}-based$ (TCO) films deposited at $500^{\circ}C$ at a pressure of $5\times10^{-6}$ Torr showed an anomalous Hall effect with p-type characteristics. On the other hand, films deposited at $700^{\circ}C$ at $5\times10^{-6}$ Torr showed n-type behaviors by a decreased solubility of cobalt. The charge carrier concentration in the p-type TCO films was approximately $7.9\times10^{22}/cm^3$ at 300 K and the anomalous Hall effect in the p-type TCO films was controlled by a side-jump scattering mechanism. The magnetoresistance (MR), measured at 5 K in p-type TCO films showed a positive behavior in an applied magnetic field and the MR ratio was approximately 3.5 %. The successful preparation of p-type DMS using the TCO films has the potential for use in magnetic tunneling junction devices.

Ferromagnetism and Anomalous Hall Effect in p-Zn0.99Mn0.01O:P

  • Kim, Hyun-Jung;Sim, Jae-Ho;Kim, Hyo-Jin;Hong, Soon-Ku;Kim, Do-Jin;Ihm, Young-Eon;Choo, Woong-Kil
    • Journal of Magnetics
    • /
    • 제10권3호
    • /
    • pp.95-98
    • /
    • 2005
  • We report hole-induced ferromagnetism in diluted magnetic semiconductor $Zn_{0.99}Mn_{0.01}$ films grown on $SiO_2/Si$ substrates by reactive sputtering. The p-type conduction with hole concentration over $10^{18}\;cm^{-3}$ is achieved by P doping followed by rapid thermal annealing at $800^{\circ}C$ in a $N_2$ atmosphere. The p-type $Zn_{0.99}Mn_{0.01}O:P$ is carefully examined by x-ray diffraction and transmission electron microscopy. The magnetic measurements for $p-Zn_{0.99}Mn_{0.01}O:P$ clearly reveal ferromagnetic characteristics with a Curie temperature above room temperature, whereas those for $n-Zn_{0.99}Mn_{0.01}O:P$ show paramagnetic behavior. The anomalous Hall effect at room temperature is observed for the p-type film. This result strongly supports hole-induced room temperature ferromagnetism in $p-Zn_{0.99}Mn_{0.01}O:P$.

미술관 전시에서의 사진 촬영이 체험 만족도에 미치는 영향 (A Study on the Effects of Selfie in the Museum Exhibition on Customer Experience Satisfaction)

  • 고정민;신한나;최지원
    • 예술경영연구
    • /
    • 제49호
    • /
    • pp.37-63
    • /
    • 2019
  • 본 연구는 미술관 전시장 내에서 사진 촬영이 관람객 체험 만족도에 어떠한 영향을 미치는지를 파악하기 위한 목적을 가진다. 이를 위해 전시장을 방문한 관람객들을 대상으로 설문조사를 실시하였다. 셀피, 작품사진 촬영이 관람객의 체험 만족도에 긍정적으로 작용하는지를 알아보기 위해 일원분산분석을 하였고, 관여도 및 나르시시즘 성향에 따른 조절효과와 몰입의 매개효과를 검증하였다. 분석결과, 첫째, 사진 촬영과 만족도의 관계에서, 사진 촬영은 했지만 셀피 촬영을 하지 않은 집단은 전시장 내에서 사진과 셀피 촬영을 모두 하지 않은 집단에 비해 관람객의 만족도가 높게 나타났다. 이 결과는 작품에 대한 사진 촬영은 관람객들에게 체험을 통한 만족감을 주지만, 셀피 촬영을 한다고 해서 만족감에 긍정적으로 작용하는 것은 아니라는 것을 보여준다. 둘째, 몰입도는 전시장 내에서 사진과 셀피 촬영 유형과 관람객의 체험 만족도의 관계에서 매개역할을 할 것이라는 가설은 모두 기각되었다. 셋째, 전시장 내에서 사진 촬영은 했지만 셀피 촬영은 하지 않은 집단과 전시장 내에서 사진과 셀피 촬영을 모두 하지 않은 집단에 따른 체험 만족도 차이에서만 관여도의 정(+)의 조절효과가 나타났다. 이는 셀피를 찍는 관람객들은 미술에 대한 관여도에 따라 만족도가 영향을 받지 않는 것을 의미한다. 본 연구의 결과는 미술관의 전시장 내 사진 촬영의 허용에 대한 정책을 결정하는데 도움이 될 것으로 기대한다.