• 제목/요약/키워드: Electric field distribution

검색결과 657건 처리시간 0.032초

Development of a Method for Improving the Electric Field Distribution in Patients Undergoing Tumor-Treating Fields Therapy

  • Sung, Jiwon;Seo, Jaehyeon;Jo, Yunhui;Yoon, Myonggeun;Hwang, Sang-Gu;Kim, Eun Ho
    • Journal of the Korean Physical Society
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    • 제73권10호
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    • pp.1577-1583
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    • 2018
  • Tumor-treating fields therapy involves placing pads onto the patient's skin to create a low- intensity (1 - 3 V/cm), intermediate frequency (100 - 300 kHz), alternating electric field to treat cancerous tumors. This new treatment modality has been approved by the Food and Drug Administration in the USA to treat patients with both newly diagnosed and recurrent glioblastoma. To deliver the prescribed electric field intensity to the tumor while minimizing exposure of organs at risk, we developed an optimization method for the electric field distribution in the body and compared the electric field distribution in the body before and after application of this optimization algorithm. To determine the electric field distribution in the body before optimization, we applied the same electric potential to all pairs of electric pads located on opposite sides of models. We subsequently adjusted the intensity of the electric field to each pair of pads to optimize the electric field distribution in the body, resulting in the prescribed electric field intensity to the tumor while minimizing electric fields at organs at risk. A comparison of the electric field distribution within the body before and after optimization showed that application of the optimization algorithm delivered a therapeutically effective electric field to the tumor while minimizing the average and the maximum field strength applied to organs at risk. Use of this optimization algorithm when planning tumor-treating fields therapy should maintain or increase the intensity of the electric field applied to the tumor while minimizing the intensity of the electric field applied to organs at risk. This would enhance the effectiveness of tumor-treating fields therapy while reducing dangerous side effects.

경계요소법을 이용한 표면 거침도에 따른 아라미드 절연지의 전계분포 해석 (Analysis of Electric Field Distribution according to Surface Roughness of Aramid Insulating Paper Using Boundary Element Method)

  • 김탁용;안병철;조경순;박형준;홍진웅
    • 한국안전학회지
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    • 제21권5호
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    • pp.34-39
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    • 2006
  • In this paper, we investigated the electric field distribution according to the roughness in aramid insulating paper for electric machine. Aramid insulating paper has been used to electric insulating of the traction motor and generators for large capacity. We studied the electric field distribution using boundary element method for Aramid insulating paper. As a result of simulation, the electric field increased according to the surface roughness existence. Electric field decreased due to radius of surface roughness reduction, and Electric field concentration appeared at electrode boundary and rough surface.

Vacuum Interrupter 내부 End_shield가 전계분포에 미치는 영향 (The influence that cup-type shield inner vacuum interrupter causes to electric field distribution)

  • 윤재훈;김병철;허준;임기조;강성화
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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    • pp.478-479
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    • 2008
  • this paper describes the electric field distribution interpretation along a shield form inner vacuum interrupter(VI). The equipotential line and electric field and field vector in a VI are analysed by a finite element method at various shield form. in result, The equipotential line and electric field distribution was affected to VI shield form. The reason is as it gets distortion of equipotential line done. shield of cup type is how to electric field distribution, finally, this paper recognized whether or not affected, and proposed gap with the most suitable shield length and an external insulation.

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표면 거침도에 따른 종이절연지의 전계분포 (Electric field distribution according to surface roughness of insulating paper)

  • 박형준;김원종;신종열;이수원;홍진웅
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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    • pp.323-326
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    • 2004
  • The this paper is describing about the electric field distribution due to the roughness in Aramid insulating paper for electric machine. The insulting and pressboard paper have been used at electric insulating of traction motor and generators. There was a change investigation of the electric field distribution according to the roughness of specimen by simulation program of Electro. We studied the electric field distribution using boundary element method for Aramid insulator. We find out an optimal condition in insulating paper of electric machine.

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전기전도도의 비균질성을 고려한 정밀 두뇌 모형 내부에서 유기되는 유도 전기장 분포해석 (Numerical Analysis of Electric Field Distribution Induced Inside a Realistic Brain Model Considering Conductivity Heterogeneity)

  • 김동훈;이일호;원철호
    • 전기학회논문지
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    • 제57권2호
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    • pp.314-319
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    • 2008
  • In this paper, the electric field distribution induced inside the brain during Transcranial Magnetic Stimulation(TMS) has been thoroughly investigated in terms of tissue heterogeneity and anisotropy as well as different head models. To achieve this, first, an elaborate head model consisting of seven major parts of the head has been built based on the Magnetic Resonance(MR) image data. Then the Finite Element Method(FEM) has been used to evaluate the electric field distribution under different head models or three different conductivity conditions when the head model has been exposed to a time varying magnetic field achieved by utilizing the Figure-Of-Eight(FOE) stimulation coil. The results show that the magnitude as well as the distribution of the induced field is significantly affected by the degree of geometrical asymmetry of head models and conductivity conditions with respect to the center of the FOE coil.

대기중에서 구(球)형 유전체의 전계 분포 시뮬레이션 (The Simulation of Electric Field Distribution for Globular Dielectric in the Atmosphere)

  • 이동훈;박재윤;박홍재;고희석
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제52권7호
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    • pp.305-309
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    • 2003
  • This paper was shown the simulation of electric field distribution of globular dielectric for design of ideal packed-bed plasma reactor. When discharge gap between the electrodes and input voltage are each 20[mm]. 10000[V] in the atmosphere, the results of simulation to the electric field was measured stronger at globular dielectric of $\phi$5[mm] than 1$\phi$[mm] and 3.33$\phi$[mm]. And the maximum electric field or globular dielectric with $\phi$10[mm] was increased about 5[%] to maximum electric field of globular dielectric with $\phi$5[mm] in the atmosphere. when dielectric constant of globular dielectric is 100, it was simulated about 90[%] of maximum electric field of globular dielectric over 1000 dielectric constant. Ana the highest electric field appeared as globular electric was parallel structure with the other globular dielectric side by side of the globular dielectric and connected to electrodes.

재활용을 고려한 HDPE/EVA필름의 전계분포 및 체적저항특성 해석 (Analysis of Electric Field Distribution and Characteristics of Volume Resistivity in HDPE/EVA Film for Recycling)

  • 이홍규;임기조;김용주
    • 한국전기전자재료학회논문지
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    • 제21권9호
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    • pp.801-807
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    • 2008
  • Recently, CV, CN-CV and CNCV-W cable are used for HVDC transmission and distribution cable. However, XLPE which is used as insulation layer of power cable has thermosetting properties. It is very difficult to recycling. In this paper, we prepared HDPE/EVA film, which the blending ratio are 80:20, 70:30, 60:40, 50;50 respectively for the purpose of recycling. Main factor such as electric field distribution and its resistivity in insulation system affected on insulation performance and reliability for HVDC applications. Therefore, electric field distribution formed by space charge and characteristics of volume resistivity was currently investigated. We suggest the possibility of utilization for HVDC insulation layer from the results.

오손물질에 따른 고분자 장간애자의 표면 전계분포 (Electric field distribution on the surface of polymer post insulator according to state of water drops)

  • 장동욱;한문섭;김형철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.1418-1419
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    • 2007
  • In order to check the electric field distribution of polymer line post insulator, we performed electric field simulation according to state of water drops. Sea water is used to the contaminant. Electric field analysis is performed with change of contact angle, number and distance of water drops.

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배전선로 주변에서의 전자계 분포 해석 (Analysis of Electromagnetic Field Around Distribution Line)

  • 권명락
    • 한국전기전자재료학회논문지
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    • 제30권10호
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    • pp.672-676
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    • 2017
  • Electrical energy is playing an increasingly vital role as the primary energy source in everyday life. With the increase in electric power consumption, power facilities are under an increasing stress and must operate at a high capacity. Consequently, the demand for electric power cables in power transmission and distribution lines is rapidly increasing. Underground distribution lines have been steadily replacing the aboveground lines owing to the increase in electric power demand and the need to increase the supply voltage. In addition to line damage, worker safety is of primary concern in this type of underground infrastructure. In this study, to improve the safety of workers dealing with underground transmission lines, we analyzed the electromagnetic field generated around the distribution line and determined the basic criteria for developing a device that can detect a live underground line.

FALC 공정에서의 전계 분포 전산모사 (Computer simulation of electric field distribution in FALC process)

  • 정찬엽;최덕균;정용재
    • 한국결정성장학회지
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    • 제13권2호
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    • pp.93-97
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    • 2003
  • FALC(Field-Aided Lateral Crystallization) 공정에서 요구되는 a-Si의 결정화는 인가한 전계(electric field)의 세기와 방향에 의존한다. 본 연구에서는 유한요소법을 적용하여 실제 패턴을 간단하게 모델링한 형상에 각 물질의 전도도를 대입하고, 전안을 가해 그 결과로 발생하는 전계의 분포를 계산하였다. 전계는 (-)극 주위에서 전극의 양쪽 모서리 부근이 가운데 부분보다 더 높게 나타났고 그 방향은 전극과 50~$60^{\circ}$를 이루는 대각선 방향이었다. 또한 예상한대로 크기가 작은 패턴이 큰 패턴보다 더 큰 전계 값을 가지는 것으로 나타났다.