• 제목/요약/키워드: Structure improvement

검색결과 4,070건 처리시간 0.028초

온-저항 특성 향상을 위한 게이트 패드 구조에 관한 연구 (Characteristic of On-resistance Improvement with Gate Pad Structure)

  • 강예환;유원영;김우택;박태수;정은식;양창헌
    • 한국전기전자재료학회논문지
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    • 제28권4호
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    • pp.218-221
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    • 2015
  • Power MOSFETs (metal oxide semiconductor field effect transistor) operate as energy control semiconductor switches. In order to reduce energy loss of the device during switch-on state, it is essential to increase its conductance. In this study we have investigated a structure to reduce the on-resistance characteristics of the MOSFET. We have a proposed MOSFET structure of active cells region buried under the gate pad. The measurement are carried out with a EDS to analyze electrical characteristics, and the proposed MOSFET are compared with the conventional MOSFET. The result of proposed MOSFET was 1.68[${\Omega}$], showing 10% improvement compared to the conventional MOSFET at 700[V].

Brightness Improvement of ZnS:Cu Powder Electroluminescence by Mixed Layer

  • Lee, Jong-Chan;Park, Dae-Hee
    • KIEE International Transactions on Electrophysics and Applications
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    • 제4C권2호
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    • pp.64-67
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    • 2004
  • In this paper, to discover the brightness improvement of ZnS:Cu powder electroluminescence (EL), a new structure is proposed in which phosphor and dielectric are mixed between electrodes. Dielectric and phosphor material are BaTiO$_3$ and ZnS:Cu, respectively. The effect of the mixed layer on EL sample is considered the improvement of source efficiency. Although the number of electrons introduced into the phosphor increases only modestly, the high electric field region of phosphor grains increases comparatively in the characteristics of brightness-voltage. Furthermore, the relaxation occurs through leading and trailing edge pairs, which is relatively efficient in characteristics of decay time. With these results, we found that the brightness of newly proposed ZnS:Cu powder electroluminescence was 167.24 cd/$m^2$ at ac voltage of 100V and frequency of 400Hz.

APPLICATION OF AQUATIC HABITAT IMPROVEMENT TECHNIQUES AT TA-CHIA RIVER IN TAIWAN

  • Tuan, Ching-Hao;Yeh, Chao-Hsien
    • Water Engineering Research
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    • 제6권4호
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    • pp.161-168
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    • 2005
  • With characteristics of river continuum, stream ecosystems have diverse components and environments from upstream channel to estuarine area. Therefore, the habitat requirements and composition of conservative object should be well understood before applying any improvement measure. In this paper, the causes of stream habitat changes were first illustrated with the categories and principles of habitat restoration methods. The structural restoration techniques of fish habitat improvement utilized by the authors or one three-year research project starting at 1990 were then presented. Through the introductions on the project background, planning guidelines, structure design, and ecological evaluation, this paper tried to provide some effective examples of stream restoration practices that ecological expert was invited for cooperation and advising.

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농촌정주환경의 정비수법에 관한 연구 (A Study on the Improvement Method of Settlement Environment in Rural Area)

  • 김익환
    • 한국주거학회논문집
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    • 제6권2호
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    • pp.123-137
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    • 1995
  • This paper presents the directions for the settling environment improvement of 244 Eups and Myeons in the Kyung buk province. Depending on their regional types. The analysis results are as follows : 1) According to the index of general estimation each regional group is classified into the developing country. suburban country. flatland country or mountain country. 2) The regional type is classified into densly-inhabitated district. less-dense district. non-developing district or perishing district. 3) The results of the dwelling environment estimation pointed out that social protection. living convenience. and neighborship are important factors for environmental improvement, depending on the regional type. From above, each region has different regional characteristics and environmental estimation structure. It is suggested to establish improvement directions. based on them.

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매립토층에서 CGS에 의한 지반개량특성에 관한 연구 (Characteristics of Ground Improvement by Compaction Grouting System in Filled Ground)

  • 천병식;여유현;정영교;정완균;정의원;김우종
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2001년도 봄 학술발표회 논문집
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    • pp.425-432
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    • 2001
  • Compaction Grouting System, the method which makes ground compact by injection of low slump mortar, Is widely used for reinforcement of soft ground, restoration of structures happened differential settlement, underpinning and restoration of damaged dam core. The quantitive analysis of ground improvement for this method has not performed yet. So, design parameters about thls method must be studied through performance of CGS in various types of soil to make CGS adaptable widely. In this study PBT, SPT and field density test were performed for analysis of the characteristics of ground improvement and pressuremeter and inclinometer were installed for analysis of the characteristics of compaction in adjacent ground. In this paper, denoted much effects for filled ground that increasing of the bearing capacity, confirming the displacement of adjacent ground and the effective radius of injection.

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IE 기법에 의한 전화기 다이얼의 공정개선에 관한 연구 (A Study on the Improvement of Processing in Telephone Dial through Industrial Engineering Technique)

  • 김현석
    • 산업경영시스템학회지
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    • 제5권7호
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    • pp.43-48
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    • 1982
  • As the result of processing improvement of Telephone Dial by substituting. Synthetic Resin for metalic materials, improved characteristics of quality can be gained as follow. 1. By the improvement of structure and assembling of the Telephone Dial, the complex process of manufacture can be a simplified one, and at the same time the working process can be done in the form of assembly. 2. In the efficiency test of the Telephone Dial, the noise decreases by 5% compared with the first test. In the test of life and environment, it accords with the standard of the Ministry of Communications and its function betters. 3. By using synthetic resins instead of metalic materials the cost can be reduced by \340 than the first improvement and it also brings the heightend value.

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