• 제목/요약/키워드: Size reduction

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부가증착을 이용한 마이크로 구멍의 크기감소 (Size reduction of micro-aperture using additional deposition)

  • 이준석;김규만
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.505-506
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    • 2006
  • Size reduction of micro-aperture using additional deposition is presented in this study. PECVD process was used for additional deposition. Rate of deposition is different with deposition direction because corners of shadowmask membrane have a taper. Deposition into backside showed better than deposition into frontside with size reduction. Shadowmask membrane with two materials has stress because of the difference of a coefficient of thermal expansion The cantilever of membrane bend to opposite direction of deposition. Deposition to both frontside and backside could reduce inside stress.

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벡터 내적을 위한 효율적인 ROM 면적 감소 방법 (Efficient ROM Size Reduction for Distributed Arithmetic)

  • 최정필;성경진;유경주;정진균
    • 한국통신학회논문지
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    • 제25권3B호
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    • pp.584-591
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    • 2000
  • 본 논문에서는 벡터의 내적에 사용되는 Distributed Arithmetic의 ROM 면적을 줄일 수 있는 방법을 제시한다. 제안된 방법을 이용하여 만든 ROM table은 그 크기가 기존 방법에 비해 반으로 감소되며 새로 생성된 ROM table에 같은 방법을 반복 적용함으로써 그 크기를 계속 1/2씩 감소시킬 수 있다. 반면에 ROM table을 반으로 줄일 때마다 논리회로의 첨가로 인한 하드웨어의 증가와 critical path의 증가가 발생하는데, 이들 오버헤드를 최소화할 수 있는 방법과 전체적인 면적 감소 효과를 극대화 할 수 있는 방법을 함께 제시한다. 제시한 방법을 적용함으로써 약 50%까지의 하드웨어를 감소시킬 수 있음을 예를 통하여 보인다.

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용액환원법에 의한 구형 니켈 분말의 입자 크기 제어 (Size Control of Spherical Nickel Powders Synthesized by Solution-Reduction Method)

  • 곽효정;;원형일;원창환
    • 대한금속재료학회지
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    • 제47권1호
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    • pp.21-25
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    • 2009
  • The reduction of $Ni(OH)_2$ by hydrazine-sodium phosphinate in water and water-diethylene glycol solutions for the preparation of spherical nickel particles has been studied at room temperature. The effect of reaction conditions on the size and morphology of Ni powder was revealed using SEM and XRD analysis technique. It was shown that in the presence of sodium phosphinate the reduction process become activated and a formation of Ni particles was completed within several minutes at room temperature. As a desired result spherical Ni powders with particles size from 0.07 to 2.0 mm were obtained.

One-Ampere Conductor Method for Tubular Linear Induction Motor for Size Reduction of Primary Iron Core

  • Lee, Byeong-Hwa;Kim, Kyu-Seob;Kwon, Soon-O;Sun, Tao;Hong, Jung-Pyo;Lee, Jung-Ho
    • Journal of Magnetics
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    • 제16권1호
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    • pp.46-50
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    • 2011
  • This paper presents size reduction of primary iron core for tubular linear induction motor by improved winding configuration. Using one-ampere conductor method, magnetic field analysis of tubular linear induction motor for size reduction is conducted. Size reduction and improvement of air gap flux distribution is achieved by improved winding configuration, and analysis results are verified by finite element analysis (FEA) and experiments.

공통 DGS를 이용한 발진기의 소형화 설계 (Design for Miniaturization of Oscillators using Common DGS)

  • 임종식
    • 한국산학기술학회논문지
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    • 제14권5호
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    • pp.2443-2448
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    • 2013
  • 본 논문에서는 공통 결함접지구조(common defected ground structure, CDGS)를 이용하여 설계한 초고주파 발진기에 대하여 기술한다. 먼저 일반적인 스터브 공진기를 사용하여 발진기를 설계하고, 이를 종래처럼 DGS를 삽입하여 소형화하는 방법을 이용하였다. 최종적으로 DGS 공진기 부분을 반으로 접은 공통 DGS 구조를 이용하여 크기를 대폭 줄인 발진기를 설계하였다. 종래의 DGS를 이용한 경우보다 더욱 소형화된 회로를 얻기 위하여 공통 DGS 구조를 삽입하였다. 공통 DGS 구조를 이용하기 위하여 접혀진 신호선로는 3차원적인 신호선 비어홀(signal via-hole)로 서로 연결된다. 한 설계예로 2.1GHz대에서 소신호 트랜지스터와 공통 DGS 구조를 이용하여 소형화한 발진기를 설계하였다. 설계한 발진기는 표준형 회로에 비하여 11mm만큼 감소한 크기를 가졌다. 제작한 회로를 실제로 측정한 결과 6.7dBm의 출력과 -133dBc/Hz@1MHz의 위상잡음 특성을 얻었다. 출력의 크기는 소형화 이전과 유사한데, 이로써 제안한 발진기 구조의 타당성이 검증된다.

코드감소와 성능향상을 위한 이질 레지스터 분할 및 명령어 구조 설계 (Code Size Reduction and Execution performance Improvement with Instruction Set Architecture Design based on Non-homogeneous Register Partition)

  • 권영준;이혁재
    • 대한전기학회논문지:전력기술부문A
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    • 제48권12호
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    • pp.1575-1579
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    • 1999
  • Embedded processors often accommodate two instruction sets, a standard instruction set and a compressed instruction set. With the compressed instruction set, code size can be reduced while instruction count (and consequently execution time) can be increased. To achieve code size reduction without significant increase of execution time, this paper proposes a new compressed instruction set architecture, called TOE (Two Operations Execution). The proposed instruction set format includes the parallel bit that indicates an instruction can be executed simultaneously with the next instruction. To add the parallel bit, TOE instruction format reduces the destination register field. The reduction of the register field limits the number of registers that are accessible by an instruction. To overcome the limited accessibility of registers, TOE adapts non-homogeneous register partition in which registers are divided into multiple subsets, each of which are accessed by different groups of instructions. With non-homogeneous registers, each instruction can access only a limited number of registers, but an entire program can access all available registers. With efficient non-homogeneous register allocator, all registers can be used in a balanced manner. As a result, the increase of code size due to register spills is negligible. Experimental results show that more than 30% of TOE instructions can be executed in parallel without significant increase of code size when compared to existing Thumb instruction set.

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임의유전체 기판을 이용한 주파수 혼합기의 소형화 (Size-Reduction of Frequency Mixers Using Artificial Dielectric Substrate)

  • 권경훈;임종식;정용채;안달
    • 전기학회논문지
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    • 제62권5호
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    • pp.657-662
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    • 2013
  • A size-reduced high frequency mixer designed by adopting artificial dielectric substrate is described in this work. The artificial dielectric substrate is composed by stacking the lower substrate in which a lot of metalized via-holes exist, and upper substrate on which microstrip lines are realized. The effective dielectric constant increases due to the inserted lots of via-holes, and this may be applied to size-reduction of high frequency circuits. In this work, in order to present an application example of size-reduction for active high frequency circuits using the artificial dielectric substrate, a 8GHz single gate mixer is miniaturized and measured. It is described that the basic circuit elements for mixers such as hybrid, low pass filter, and matching networks can be replaced by the artificial dielectric substrate for size-reduction. The final mixer has 55% of size compared to the normal one. The measured average conversion gain is around 3dB which is almost similar result as the normal circuit.

MR-EMR 복합공정에 의한 탄탈륨분말의 제조시 온도변화에 따른 분말의 특성 (Characteristics of Powder with Change of Temperature in Production of Tantalum Powder by MR-EMR Combination Process)

  • 배인성;윤재식;박형호;윤동주;이민호;설경원;김병일
    • 한국분말재료학회지
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    • 제10권6호
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    • pp.395-405
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    • 2003
  • In the conventional metallothermic reduction (MR) process for obtaining tantalum powder in batch-type operation. it is difficult to control morphology and location of deposits. On the other hand, a electronically mediated reaction (EMR) process is capable to overcome these difficulties and has a merit of continuous process, but it has the defect that the reduction yield is poor. MR-EMR combination process is a method that is able to overcome demerits of MR and EMR process. In this study, a MR-EMR combination process has been applied to the production of tantalum powder by sodium reduction of $K_2$TaF$_{7}$. The total charge passed through external circuit and average particle size (FSSS) were increased with increasing reduction temperature. The proportion of fine particle (-325 mesh) was decreased with increasing reduction temperature. The yield was improved from 65% to 74% with increasing reduction temperature. Considering the charge, impurities, morphology, particle size and yield, an reduction temperature of 1,123 K was found to be optimum temperature for MR-EMR combination process.

습식 화학적 환원법에 의한 AgNO3로부터 Ag 분말의 제조 1. 균일한 구형 Ag 분말의 제조를 위한 최적 반응계 확립 (Preparation of Ag Powder from AgNO3 by Wet Chemical Reduction Method1. The Establishment of Optimum Reaction System for the Preparation of Spherical Ag Powder)

  • 윤기석;박영철;양범석;민현홍;원창환
    • 한국분말재료학회지
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    • 제12권1호
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    • pp.56-63
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    • 2005
  • Ag powder was prepared from $AgNO_3$ by wet chemical reduction method using various reduction agent system involving $AgNO_3$, $AgNO_2$(AgCl) and Ag complex ion aqueous solution. The pure Ag powder could be prepared regardless of reaction system but the particle shape and distribution were affected very much according to the kind of reduction agents and reaction systems. The optimum reaction system for the preparation of the silver powder having the uniform particle shape and size distribution was Ag complex ion aqueous solution-reduction agent system and in particular, $H_2O_2$ and $C_6H_8O_6$as a reduction agent leaded the more uniform particle shape and size distribution.

Development of volume reduction method of cesium contaminated soil with magnetic separation

  • Yukumatsu, Kazuki;Nomura, Naoki;Mishima, Fumihito;Akiyama, Yoko;Nishijima, Shigehiro
    • 한국초전도ㆍ저온공학회논문지
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    • 제18권1호
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    • pp.10-13
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    • 2016
  • In this study, we developed a new volume reduction technique for cesium contaminated soil by magnetic separation. Cs in soil is mainly adsorbed on clay which is the smallest particle constituent in the soil, especially on paramagnetic 2:1 type clay minerals which strongly adsorb and fix Cs. Thus selective separation of 2:1 type clay with a superconducting magnet could enable to reduce the volume of Cs contaminated soil. The 2:1 type clay particles exist in various particle sizes in the soil, which leads that magnetic force and Cs adsorption quantity depend on their particle size. Accordingly, we examined magnetic separation conditions for efficient separation of 2:1 type clay considering their particle size distribution. First, the separation rate of 2:1 type clay for each particle size was calculated by particle trajectory simulation, because magnetic separation rate largely depends on the objective size. According to the calculation, 73 and 89 % of 2:1 type clay could be separated at 2 and 7 T, respectively. Moreover we calculated dose reduction rate on the basis of the result of particle trajectory simulation. It was indicated that 17 and 51 % of dose reduction would be possible at 2 and 7 T, respectively. The difference of dose reduction rate at 2 T and 7 T was found to be separated a fine particle. It was shown that magnetic separation considering particle size distribution would contribute to the volume reduction of contaminated soil.