• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1999년도 제14차 학술회의논문집
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• pp.262-265
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• 1999

This paper describes a new method for object extraction necessary for image tracking systems. The extraction method which this paper proposes here is that an M-array is set between a camera and the object and the obtained image including the object and M-array is pro-cessed for extracting the object. The image processing utilizes a characteristic of M-array which is robust to noise. When an M-array is overlapped on the object in background image, the object woud have a part of M-array, which is detected by use of partial correlation between the mosaic image of M-array and the standard M-array. Thus the shape and position of the object are extracted by extracting a common domain of width of high correlation value. Experiments are carried out by using an actual photo of Kumamoto city taken from an airplane as background, and by use of a rectangular and circular object. The results of experiment show a wide application of this method for practical image tracking systems.

• 한국건설순환자원학회논문집
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• 제4권2호
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• pp.172-179
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• 2016

콘크리트 구조물의 내구수명평가는 주로 해석 변수의 변동성을 고려하지 않은 결정론적 방법과 변동성을 고려한 확률론적 방법이 사용되고 있다. 본 연구에서는 해안으로부터의 거리와 높이에 따른 내구수명 평가를 위해 일본토목학회에서 제안한 해안으로부터 거리에 따른 표면염화물량과 실태조사를 통한 높이에 따른 표면염화물량을 적용하였다. Fick's $2^{nd}$ Law에 기반을 둔 Life-365를 이용한 결정론적 방법과 MCS을 이용한 확률론적 방법을 수행하여 내구수명을 평가하였다. 평가결과 확률론적 방법이 결정론적 방법보다 낮은 내구수명이 평가되었으며, 이는 기존에 연구된 확산계수, 피복두께, 표면염화물량 등의 변동계수뿐 아니라 낮은 목표내구적 파괴확률을 설정하였기 때문이다. 결정론적 방법에서는 해안가 250m 이내에서는 높이 60m 이상에서, 500m에서는 염해에 의한 피해를 고려하지 않아도 되는 것으로 평가되었다. 또한 확률론적인 방법에서는 전 구간에서 60m 이상의 지역, 250m 이내에서는 40m 이상의 구조물은 염해에 대하여 안전한 것으로 평가되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.32-35
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• 2004

In boundary estimation in Electrical Impedance Tomography (EIT), conventional method is the modified Newton Raphson (mNR) method .The mNR is famous for good method since has good convergence and robustness against noisy data. But the mNR is low efficiency to get and update Jacobian matrix. So, the mNR become very slow algorithm. We propose the Quasi Newton (QN) method to improve efficiency which will lead to speed up in boundary estimation. The QN can improve a low efficiency by using estimated Jacobian matrix contrary to using exactly calculated Jacobian matrix, this used by the mNR. And finally, we propose the modified Quasi Newton (mQN) method because the QN has some problems such as bad early convergence rate and instability of 'divided by zero'. For the verification of the propose method, numerical experiments are conducted and the results show a good performance.

• Bulletin of the Korean Chemical Society
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• 제30권2호
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• pp.363-367
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• 2009

An isotope-dilution flow-injection electrospray/mass spectrometric method was developed for the accurate determination of glucosamine contents in pharmaceutical formulations. Samples were extracted by methanol. After spiking glucosamine-1-$^{13}C_1$ as an internal standard, the extracts were then analyzed by flow-injection ESI/MS in a selected ion monitoring (SIM) mode to detect [M+H]$^+$ ions of the analyte and its isotope analogue at m/z 180 and m/z 181, respectively. Confirmatory measurements were made by selectively monitoring the collisionally induced dissociation channels of m/z 180 $\rightarrow$ m/z 72 and m/z 181 $\rightarrow$73, respectively, to test the possibility of bias in the SIM method due to matrix interferences, but any significant bias in the SIM mode was not observed. Repeatability and reproducibility studies showed that the flow-injection ESI/MS method is a reliable and reproducible method which can provide a typical method precision of 1.0 %. Other results for the method validation are reported.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권4호
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• pp.442-446
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• 2010

본 논문에서는 대량의 사진 데이터베이스에 대한 효과적인 사진 검색을 위하여 브라우징을 지원하는 인덱싱 방법을 제안하였다. 제안한 방법은 대표적인 거리 공간 인덱싱 방법인 M-트리를 기본 구조로 하였다. 그러나 M-트리는 pruning을 통한 검색의 효율성에 초점을 맞추었으며 브라우징을 직접적으로 고려하지 않는다. 따라서 본 논문에서는 M-트리의 노드 선택 방법, 노드 분할 방법 및 노드 분할 조건을 브라우징에도 적합하도록 변경하였다. 제안한 방법을 적용하여 실험한 결과 노드 응집도와 클러스터링 정확도에서 각각 2배와 1.5배의 향상을 나타내었으며, 검색 성능도 약 2배정도 빨라지는 효과를 확인하였다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제18권2호
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• pp.143-152
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• 2018

Purpose: In this paper, we propose calculation methods of Maintenance Float (M/F). Results of each method are compared and verified by using commercial tool (OPUS Suite). As modern weapon systems become more expensive, we need to find the most economical and efficient method to achieve the target operational availability (Ao). Methods: Three kinds of methods (Considering the number of CSP, Applying the Poisson distribution, and Applying M&S Tool) are used to find the number of M/F. Three methods (Considering the number of CSP, Applying the Poisson distribution, and Applying M&S Tool) were used to estimate the required number of M/F. The analysis results were verified by SIMLOX. The cost of equipment calculated by each analysis method was compared and the cause of the difference was analyzed. Conclusion: Ao and cost must be considered to find the optimal number of M/F. In general, it costs more to increase availability. But the cost is not necessarily proportional to Ao. Therefore, it is better to compare the calculation method and determine the final MF quantity.

• 대한전자공학회논문지SD
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• 제37권12호
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• pp.1-9
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• 2000

미세구조 N-채널 MOSFET의 게이트-소스 전압에 의존하는 유효 채널 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출을 위해서 새로운 ERM-방법을 제안하였다. ERM-방법은 선형영역에서 동작하는 게이트 길이가 다른 두개의 소자($W_m/L_m=30{\mu}m/0.6{\mu}m, 30{\mu}m/1{mu}m$)에 적용되었고 유효 채널 캐리어 이동도를 모델링하고 추출하는 과정에서 게이트-소스 전압에 의존하는 소스 및 드레인 기생저항의 영향을 고려하였다. ERM-방법으로 추출된 특성변수들을 사용한 해석적 모델식과 소자의 측정데이터를 비교해본 결과 오차가 거의 없이 일치하는 것을 확인하였다. 따라서, ERM-방법을 사용하면 대칭구조 및 비대칭구조 소자의 유효 채널 캐리어 이동도, 소스 및 드레인 기생저항과 다른 특성변수들을 정확하고 효율적으로 추출할 수 있을 것으로 기대된다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1987년도 춘계학술발표회 논문집
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• pp.184-187
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• 1987

The method of Conjugate Gradient(C.G.M) is applied to the solution of current distribution from body of revolution (B.O.R).Using the C.G.M it is possible to analyze electrically large arbtrarily oriented B.O.R. The fundamental differences between C.G.M and moment method are outlined. This method converges for any initial guess and this techniqe gurantees a monotonic convergence. Numerical results are presented for electromagnetic case which show good agreement with moment solution.

• Clinical and Experimental Reproductive Medicine
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• 제28권3호
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• pp.191-198
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• 2001

Objective : This study was conducted to examine the effect of vitrification on the survival and in vitro development of mice 1-cell zygotes. Method: Effects of exposure to vitrification solution and vitrification, with different concentrations of the cryoprotectant solution, were examined. The 1-cell zygotes were also subjected to a slow freezing-thawing method to compare with vitrification method. Solution composed of ethylene glycol (6.0 M, 5.0 M, 4.0 M) and sucrose (1.0 M) were used as cryopropectant. The experiments employed the method loading the embryos on electron microscope grids. Results: I. The effects of exposure in vitrification solution. 1-cell zygotes were non-toxic at all concentrations of the vitrification solution showing the survival rate between 88.1% and 97.5%. Development into 2-cell was more successful in the higher concentrations of the vitrification solution. Therefore, higher concentrations of the vitirification solution do not seem to cause any problems in vitrification procedure. II. The effects of vitrification method. 1-cell zygotes showed the survival rate between 78.8% and 92.4%. The lowest and the highest survival rate was observed in the 6.0 M and 4.0 M vitrification solution, respectively. 2-cell development rates varied from 77.6% to 91.3%. Blastocyst development rate was shown highest in 5.0 M and the lowest in 4.0 M solution. Therefore, the highest 2-cell and blastocyst development rate was observed in 5.0 M solution. III. Comparison of vitrification and slow freezing-thawing method on 1-cell zygotes. This experiment showed that 1-cell zygotes had the highest survival and development rates in 5.0 M vitrification solution. Vitrified group of 1-cell zygotes, in the 5.0 M vitrification solution, were compared with the group processed in slow freezing-thawing method. The development rate into 2-cell and blastocyst as well as the survival rate were higher in the vitrified group than in the slowly freezed group. Conclusion: 1. The results demonstrate that the best cryoprotectant is a 5.0 M vitrification solution for 1-cell zygotes. 2. Vitrification method significantly increases the survival rate of the 1-cell zygote and its development into 2-cell and blastocyst. Equilibration and exposure time during the vitrification was remarkerbly short in this experiment. Total time, from the exposure to vitirification solution to storage in the liquid nitrogen, was taken only 90 seconds. In contrast, the slow freezing-thawing method have taken more than four hours. Taken together, we presume that the overall time used for the procedure contributes to the results as an important parameter. 3. The loading of 1-cell zygotes on the EM grid is technically more simple and takes less time than the straw or cryo vial method.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.341-346
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• 2002

This study is intended to check the possibility to estimate water content by heat-drying method with variation of W/C and slump. According to the results, in case of electric range method, when water content is less than 165kg/m$^3$ in mixture, it is estimated more and in more than 165kg/m$^3$, it is estimated less. It shows that water content in gas burner method is estimated less by about 2kg/m$^3$. Also, estimated water content shows difference by less than 12kg/m$^3$ in electric range method and by less than 12kg/m$^3$ in gas burner method. Therefore, it is thinked that if tested without error from preparing a sample to calculating amount of water, water content will be estimated exactly in the construction field.