• 제목/요약/키워드: sheath

검색결과 1,236건 처리시간 0.03초

복부에 발생한 악성 말초신경초종양 (Malignant Peripheral Nerve Sheath Tumor of Abdomen)

  • 소규섭;임영국;홍용택;김훈남
    • Archives of Plastic Surgery
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    • 제38권6호
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    • pp.886-889
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    • 2011
  • Purpose: Malignant peripheral nerve sheath tumor without neurofibromatosis type 1 is very rare neoplasm. Development in the superficial soft tissue is exremely rare. Authors experienced one rare case of primary malignant peripheral nerve sheath tumor developed on abdomen. The clinical and histologic findings were described. Methods: An 83-year-old man visited hospital with an $11{\times}6.5{\times}4.5$ cm sized ulcerated and hemorrhagic mass on abdomen. The tumor was localized in abdominal skin and started growing 3 years ago. Results: Wide excision with safety margin of 2 cm and limberg flap was done. The postoperative biopsy revealed a malignant peripheral nerve sheath tumor. There was no evidence of recurrence of tumor for 16 months. Conclusion: Malignant peripheral nerve sheath tumor is an aggressive malignant tumor. An abrupt enlargement of size, ulceration and bleeding are suggestive of malignant chnages of the tumor. We recommand early wide excision with enough safety margin as treatment of malignant peripheral nerve sheath tumor.

EMTP 기반 지중송전케이블 시뮬레이터 개발 및 적용 (Development and Applicatin of EMTP Based Power Cable Simulator for Underground Transmission Cables)

  • 정채균;박흥석;강지원;이종범;한상옥
    • 전기학회논문지
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    • 제59권8호
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    • pp.1374-1381
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    • 2010
  • This paper discusses the characteristics of sheath circulating current as well as the development and application of new software for underground power cable systems. Generally, in steady state, high sheath circulating current causes the increase of sheath temperature and thermal resistance which leads to the steeply reduction of the power capacity. Therefore, the exact calculation of sheath circulating current is required for analysis about the influence of high sheath current on permissible current. In this paper, Power Cable Simulator is developed for calculation of the sheath current. It can analyse the sheath current by real time. It is also easier to use than conventional software, such as EMTP and CabSim, because all the data for calculating the cable parameters are stored in a database(DB) within Power Cable Simulator. In addition, the accuracy of Power Cable Simulator is also proved through the comparison among the current calculated by Power Cable Simulator, EMTP and Cabsim with measured current.

다회선 지중송전 케이블에서의 EMTP를 이용한 시스 순환전류 분석 (Analysis of Sheath Circulating Current on Multi-underground Transmission Cables using EMTP)

  • 하체웅;김정년;이수길;김동욱;이종범;강지원
    • 대한전기학회논문지:전력기술부문A
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    • 제51권10호
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    • pp.510-517
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    • 2002
  • The use of underground transmission cables has continuously increased in densely inhabited urban and suburban area. Due to a increasing demand of underground cables, two or more circuits are installed in parallel for several kilometers. It, however, has not been realized that the sheath circulating current is generated in the system where a large number of cables are laid in the same route. In this paper, sheath circulating current is analyzed by the EMTP and compared with the measured values. Unbalance arrangement of cables or cross-bonding length causes a significant effect on the magnitude of the sheath current. Sheath circulating current could be greatly reduced by the symmetrical configuration of cables and installation of the impedance reduction system. Especially, with the impedance system of 1Ω installed, the sheath circulating current is reduced by 85.7%.

PP/Tencel/흡한속건PET/하이브리드 복합사 구조가 고감성 의류용 직물의 물성에 미치는 영향 (Effect of Hybrid Yarn Structure Composed of PP/Tencel/Quick dry PET on the Physical Property of Fabric for High Emotional Garment)

  • 김현아;손황;김승진
    • 한국의류산업학회지
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    • 제17권3호
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    • pp.462-475
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    • 2015
  • This paper investigated the characteristics of the physical properties of woven fabrics according to the yarn structure and fibre property. It was found that wicking property of woven fabrics made of sheath/core hybrid yarn were better than those of siro spun and siro-fil hybrid yarns, which was caused by platform for transport of moisture vapor by filaments on the core part of sheath core hybrid yarns. In drying property, the fabric specimen woven by PP/Tencel sheath core hybrid yarns as a warp and Coolmax/Tencel spun yarn as a weft showed quick drying property, which was caused by the sheath core hybrid yarn structure as drainage of water moisture and coolmax fibre characteristics as quick dry material. Concerning to breathability and thermal conductivity as heat transport phenomena, it was observed that breathability of fabrics woven with hybrid yarns such as sheath core and siro-fil in the warp and hi-multi filaments in the weft showed the lowest water vapor resistance, which was explained as due to for air gap in the fibres of the spun yarns to restrict the wet heat transport from perspiration vapor. Thermal conductivities of the fabrics woven with PET/Tencel siro-fil yarns in the weft and hybrid yarns such as sheath core and siro-fil in the warp revealed the highest values, which was observed as due to higher thermal conductivity of PET than PP and more contact point between fibres in the siro-fil and sheath core hybrid yarns.

차폐분리에 의한 전력케이블 및 접속함의 부분방전 위치 검출 (PD Localization by Metal Sheath Interruption Methods for Power Cable and Accessories)

  • 이창영;신두성;김충식;김동욱;박완기
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제49권3호
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    • pp.196-201
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    • 2000
  • It is very important not only to detect PD signal but also to locate PD source in power cable line including its accessories. In this paper, the PID localization technique using interruption of metal sheath of cable or accessory is described. By interruption of metal sheath, the polarity of PD pulse to be measured on each part can be compared. With this technique, the exact location of PD in the accessory which has some defects can be found. Although the 'Soft' interruption method, that is, cable sheath is divided by semi-conductive layer with the resistance of higher than 1 k$\Omega$, was used instead of 'Hard' interruption method, it is also possible to detect exact location of PD. This technique is considered to be very effective for detecting PD localization in the type test of cable and accessories.

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지중송전계통에서 시스순환전류 해석 및 저감방안 (Analysis and Reduction Methods of Sheath Circulating Current in Underground Transmission Systems)

  • 정채균;이종범;강지원;장태인
    • 대한전기학회논문지:전력기술부문A
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    • 제50권11호
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    • pp.537-545
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    • 2001
  • This paper describes the analysis of sheath circulating current and various methods to reduce the large circulating current in case of operating cable system using EMTP/ATPDraw. And also, possible methods are proposed through a detailed analysis regarding cable systems by considering various electrical and environmental factors. It is evaluated that the proposed reduction methods can be effectively applied to reduce the large sheath circulating over current with the minimized electrical problems.

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방식층 보호장치의 설치에 따른 지중송전케이블 시스 유기전압 해석 (Analysis of Sheath Induced Voltage in Transmission Power Cable Connected with CCPU)

  • 이준성;이종범;김영
    • 대한전기학회논문지:전력기술부문A
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    • 제49권1호
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    • pp.19-25
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    • 2000
  • This paper describes the sheath induced voltage in underground transmission cable system which will be operated with cable cover protection unit(CCPU). Simulation was carried out to analyze the sheath induced voltage in the real cable system which was installed by 154㎸ CV cable in the case with and without CCPU. The sheath induced voltage will be also analyzed according to the change of grounding method, fault resistance and fault angle. Simulation was performed using EMTP and ATP Draw, the simulation results show whether the CCPU in necessary or not in underground transmission power cable system.

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플라즈마 쉬스 (Sheath)를 이용한 이온 주입법 (Ion Implantation Using Plasma Sheath)

  • 조무현
    • 한국표면공학회지
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    • 제23권1호
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    • pp.1-7
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    • 1990
  • Ion implantation is a well established superior superior surface modification technique for the improvement of wear resistance, hardenece, hardness, corrosion resistance, biocompaibity, surface friction, as well as for the modification of surface electric conductance. Conventional ion implantaion is a line-of-sight process witch ues the ion beam accelerator techniques. Plasma sheath ion implantation (PSII), as a new technique, is described in this paper. In PSII high voltage pulse is applied to a target material placed directly in a plasma, forming a think ion-matrix sheath around the target. Ions accelerate through the sheath drop and bombard the traget from all sides simultaneosuslyregardless of the target shape. This paper describes the principle of PSII, which has non-line-of sight characteristics, as well as the experimental appratus.

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반도체 식각 공정용 공간 평균 시뮬레이터 및 데이터베이스 개발 (Development of a Global Simulator and Databases for Semiconductor Etching Processes)

  • 권득철;이세아;장원석;송미영;윤정식;유동훈;김대웅;유신재;임연호
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2013년도 춘계학술대회 논문집
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    • pp.65-66
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    • 2013
  • 최근 개발된 수치해석 알고리즘 및 RF sheath 모델을 적용하여 반도체 식각 공정용 공간 평균 시뮬레이터를 개발하였다. 개발된 시뮬레이터는 전자가열 모듈, 수송 모듈, 그리고 RF sheath 모듈로 구성된다. 유도결합 플라즈마원에 대한 전자가열모듈은 비충돌 과정인 anomalous skin effect가 포함된 Yoon의 모델을 적용하였고, 축전결합 플라즈마원에 대해서는 RF sheath 모델을 수치적으로 풀어 흡수된 파워를 결정하고 수송 모듈과 일관성을 잃지 않게 결합되었다. RF sheath 모듈에서는 Dai의 collisonless sheath 모듈을 적용하였고 RF 펄싱이 적용될 수 있도록 확장하였다. 특히, 식각 공정에 사용되는 fluorocarbon 플라즈마에 대한 데이터베이스를 개발하였고, 또한 진단 데이터와의 비교를 통해 데이터베이스를 최적화하였다.

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플라즈마 파라메타와 자계의 상관관계에 관한 연구 (A study on the relationships between plasma parameters and magnetic field)

  • 김두환;장윤석;조정수;박정후
    • 대한전기학회논문지
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    • 제45권3호
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    • pp.426-431
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    • 1996
  • It is well known that the understanding of the complex mechanism of magnetoplasma is closely related with understanding of the collective behavior of discharge plasma parameters such as the cathode-sheath potential, cathode-sheath thickness, electron temperature, electron density, and ambipolar diffusion. In this paper, some of the relationships between these plasma parameters and magnetic field is investigated experimentally with a Langmuir probe in the magnetoplasma generated by D.C diode system. It is found that when magnetic field is increased, cathode-sheath potential, cathode-sheath thickness, and ambipolar diffusion are decreased. In addition, peak ion density obtained as a parameter of ionic signal voltage by Faraday cup method is independent of magnetic field. (author). 9 refs., 11 figs.,1 tab.

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