• 제목/요약/키워드: Parameter extract

검색결과 319건 처리시간 0.022초

Azadirachta Indica엑스와 요드화이온이 산성매체에서 Al 부식방지에 대한 Synergistic 효과 (Synergistic Effect of Azadirachta Indica Extract and Iodide Ions on the Corrosion Inhibition of Aluminium in Acid Media)

  • Arab, S.T.;Al-Turkustani, A.M.;Al-Dhahiri, R.H.
    • 대한화학회지
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    • 제52권3호
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    • pp.281-294
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    • 2008
  • Potintiodynamic 분광작용과 임피던스 기술을 이용하여 요드화 이온으로 Azadirachta Indica 엑스가 존재하는 0.5 M HCI용액 속의 Al 에 대한 부식 방지 작용을 상승시켰다. 이는 0.5 M HCI 용액에서 AZI 엑스가 Al의 부식을 방지함을 발견하였다. AZI 엑스 농도가 24% v/v이전에는 농도가 커짐에 따라 방지효율도 따라서 커진다. 하지만 AZI 엑스 농도가 더 커지면 Inh. %는 오히려 작아진다. 요드화 이온의 증가는 방지효율을 상당한 양으로 강화시킨다. 요드화 이온이 혼합적으로 존재할 때 Inh. %값은 증가한다. 이는 낮은 AZI 엑스 농도에서 AZI 엑스는 joint adsorption을 통하여 insoluble complex을 형성한다. 하지만 높은 AZI 엑스 농도에서는 요드화 이온과 형성한 complex사이에 competitive adsorption이 나타나 낮은 Inh. %를 초래한다. At all studied요드화 이온의 농도에서 요드화 이온과 AZI 엑스가 동시에 존재할 때의 Inh. %값은 AZI 엑스만 존재할 때보다 감소된다. Synergism parameter Sq는 표면 Coverage 값으로 계산된다. 이 Parameter는 AZI 엑스경우 unity 보다 더 큼을 알 수 있다. 이는 요드화 이온의 증가로 인하여 방지효율이 강화 되였음을 제시한다.

DTC에 의한 공정 파라메터 추출 및 제작된 소자의 특성 (Characteristics of Fabricated Devices and Process Parameter Extraction by DTC)

  • 서용진;이철인;최현식;김태형;최동진;장의구
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1993년도 추계학술대회 논문집
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    • pp.29-34
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    • 1993
  • In this paper, we used one-dimensional process simulator, SUPREM-II, and two-dimensional device simulator, MINIMOS 4.0 to extract optimal process parameter that can minimize degradation of device characteristics caused by process parameter variation in the case of short channel nMOSFET and pMOSFET device. From this simulation, we have derieved the relationship between process parameter and device characteristics. Here we have presented a method to extract process parameters from design trend curve(DTC) obtained by process and device simulations. We parameters to verify the validity of the DTC method. The experimental result of 0.8 $\mu\textrm{m}$ channel length devices that have been fabricated with optimal that reduces short channel effects, that is, good drain current-voltage characteristics, low body effects and threshold voltage of 1.0 V, high punchthrough and breakdown voltage of 12 V, low subthreshold swing(S.S) values of 105 mV/decade.

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서브마이크론 MOSFET의 파라메터 추출 및 소자 특성 (1)

  • 서용진;장의구
    • E2M - 전기 전자와 첨단 소재
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    • 제7권2호
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    • pp.107-116
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    • 1994
  • In the manufacturing of VLSI circuits, variations of device characteristics due to the slight differences in process parameters drastically aggravate the performances of fabricated devices. Therefore, it is very important to establish optimal process conditions in order to minimize deviations of device characteristics. In this paper, we used one-dimensional process simulator, SUPREM-II, and two dimensional device simulator, MINIMOS 4.0 in order to extract optimal process parameter which can minimize changes of the device characteristics caused by process parameter variation in the case of short channel nMOSFET and pMOSFET device. From this simulation, we have derived the dependence relations between process parameters and device characteristics. Here, we have suggested a method to extract process parameters from design trend curve(DTC) obtained by these dependence relations. And we have discussed short channel effects and device limitations by scaling down MOSFET dimensions.

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확장칼만필터를 이용한 수중운동체의 유체계수식별 (Hydrodynamic coefficients identification of underwater vehicle by means of an extended kalman filter)

  • 이동권;최중락;양승윤
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.611-615
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    • 1991
  • A technique for estimation of the hydrodynamic parameter of an underwater vehicle is presented. An extended, augmented Kalman Filter is used to extract the hydrodynamic parameter. Computer generated data were used for the measurement information in lieu of actual run data. The feasibility of identifying values of the hydrodynamic parameter of an underwater vehicle is studied. Computer simulation are done in order to validate the performance of the proposed algorithm.

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1-l0GHz 대역에서의 SiGe HBT′s 소신호 입력 임피던스 Parameter 추출 방법 (1-10GHz, Input Impedance Parameter Extraction Method of SiGe HBT)

  • 김도형;이상흥;구용서;안철
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 추계종합학술대회 논문집(2)
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    • pp.245-248
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    • 2000
  • In this paper, we present a high-performance SiGe HBT's RF input impedance parameter extraction method. The SiGe HBT has emitter width of 0.5${\mu}{\textrm}{m}$ and length of 6${\mu}{\textrm}{m}$. S-parameter has been measured with the collector current of 1~3㎃ using on-wafer RF measuring system . The pre-calculation method was used in order to overcome the local minimum problem. This method enabled us to extract a RF(1~10㎓) input impedance parameter.

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DC 순방향 바이어스 인가조건에서 Schottky 다이오드의 SPICE 모델 파라미터 추출 방법에 관한 연구 (The Study on the SPICE Model Parameter Extraction Method for the Schottky Diode Under DC Forward Bias)

  • 이은구
    • 전기학회논문지
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    • 제65권3호
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    • pp.439-444
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    • 2016
  • The method for extracting the SPICE model parameter of Schottky diode under DC forward bias is proposed. A method for improving the accuracy of the SPICE model parameter at various temperatures is proposed. Three analysis steps according to the magnitude of the current is used in order to extract the parameters effectively. At each analysis step, initial parameters are calculated by using the current-voltage equations and the Levenberg-Marquardt analysis is proceeded. To verify the validity of the proposed method, the SPICE model parameters for the BAT45 and FSV1045 under DC forward bias is extracted. Schottky diode currents obtained from the proposed method shows the average relative error of 6.1% and 9% compared with the measured data for the BAT45 and FSV1045 sample at various temperatures.

Visual Inspection of Tube Internal

  • Choi, Young-Soo;Cho, Jai-Wan;Kim, Chang-Hoi;Seo, Yong-Chil;Kim, Seung-Ho
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.789-792
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    • 2003
  • Pipe inspection has a great importance to ensure safety for the nuclear power plant. In this paper, we designed visual inspection module for the tube internal, which diameter is 15${\sim}$20mm. And we made inspection module which consisted of CCD camera and light. And the relation between image and real world coordinate is established. Image processing is performed to calculate mapping parameter and analyze the size of defect. For the calculation of mapping parameter, experiment is performed using grid type test pattern. Acquired image is processed to extract image coordinate. Edge detection, thresholding, median filtering and morphology filtering is applied to extract grid pattern. Extracted image coordinate is used to calculate image to real world mapping. Lens distortion was considered and corrected to get exact data. Coordinate transformation data is provided for the users to recognize easily. Experiment was performed using grid type test pattern, we extracted lens distortion parameter and real coordinate of defect point. Radial distortion of lens was corrected but tangential distortion was not considered. As continuum to this study, the tangential distortion of lens is considered and improvement of analy zing technique for the tube internal be explored continuously.

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서해대교 사장교의 동특성 추출 : II. 고유진동수와 감쇠비 (Modal Parameter Extraction of Seohae Cable-stayed Bridge : II. Natural Frequency and Damping Ratio)

  • 김병화;박종칠
    • 대한토목학회논문집
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    • 제28권5A호
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    • pp.641-647
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    • 2008
  • 본 논문은 상시진동데이터로부터 구조물의 고유진동수 및 감쇠비를 추정하는 기법을 소개한다. 제안된 기법은 TDD기법에서 추출된 모드형상과 상호상관신호로부터 직교 잡음이 제거된 자유진동함수를 추출하고 시스템 인식기술을 적용하여서 각 모드별 고유진동수와 감쇠비를 추정한다. 제안 알고리즘의 정확도는 수치적으로 기존의 기법과 비교분석 되었다. 제안 알고리즘의 현장 적용성 검토는 서해대교 보강형의 수직방향 가속도에 대한 상시진동데이터를 통하여 검증되었으며, 총 24개의 저차모드가 추출되었다.

Parameter Extraction Procedure for Ion Implantation Profiles to Establish Robust Database based on Tail Function

  • Suzuki, Kunihiro;Kojima, Shuichi
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제10권4호
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    • pp.251-259
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    • 2010
  • We proposed a tail function parameter extraction procedure for the establishment of a robust ion implantation database. We showed that, for the expression of ion implantation profiles, there are many local minimum values set for the third and fourth moment parameters of $\gamma$ and $\beta$ for the Pearson function that comprises the standard dual Pearson and tail functions. We proposed the use of a joined tail function as a mediate function to extract $\gamma$ and $\beta$, and demonstrated that this enables us to extract the parameters uniquely. Other parameters associated with channeling phenomena can also be simply and uniquely extracted by our procedure.

두시 추출물을 함유한 한방화장품의 주름개선 효과에 대한 예비 임상연구 (Pilot Study on Anti-wrinkle Effect of Herbal Cosmetic Containing the Extracts of Douchi (fermented Glycine max Merr.))

  • 김희연;차호열;하기태;최준용;천진홍;김기봉
    • 동의생리병리학회지
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    • 제31권6호
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    • pp.380-384
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    • 2017
  • From March 1, 2017 to May 31, 2017, subjects were allowed to apply a wrinkle-improving herbal cosmetic product containing the extract of Douchi for 8 weeks. The effectiveness of herbal cosmetics was evaluated through wrinkle improvement efficacy parameter analysis, subjective wrinkle improvement through questionnaires, and adverse reaction. The herbal cosmetic products containing the extract of Douchi showed a significant decrease in the wrinkle improvement efficacy parameter analysis result. The results of the subjective satisfaction analysis after use were also evaluated positively. We could confirm the possibility of wrinkle improvement effect of Douchi extract, and it will be possible to contribute to the expansion of korean medicine field through more studies in the future.