• 대한원격탐사학회지
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• 제29권5호
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• pp.487-497
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• 2013

본 연구에서는 고해상도 스테레오 영상분석에 기반하여 DSM에 존재하는 오차들을 효율적으로 검출하는 기법을 제시한다. 스테레오 영상정합을 통한 DSM 자동생성은 여러 가지 측면에서 DSM 확보를 위한 유용한 방법이 될 수 있는데, 자동생성 과정에서 발생하는 과대오차들을 포함하고 있어 이를 개선하기 위한 효율적 검출 방법이 필요하다. 본 연구에서는 고해상도 스테레오 영상을 활용한 상관계수 분석 기법을 적용하여 DSM의 모든 격자의 신뢰도를 나타낸다. 제안 기법을 적용하면, DSM 정확도에 치명적인 영향을 주어 우선적으로 보정이 요구되는 과대오차 지역을 자동으로 검출할 수 있다. 해당 지역의 참값 DSM을 활용하여 제안기법의 신뢰성을 확인하였으며 실험결과로부터 제안기법이 효율적인 DSM 보정을 위한 유용한 DSM 오차분석 기법이 될 수 있음을 확인하였다. 제안된 기법은 다양한 DSM 및 DEM 자료의 오차분석에 활용이 가능하며 따라서, 신뢰성 있는 DSM 및 DEM 확보에 유용하게 활용될 수 있을 것으로 기대한다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.457-462
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• 2005

In this study, the performance of automatic thermostatic valves according to each heating method of a large scale residential building were researched by simulation. The flow characteristics of the entire pipe networks of the hot water radiant heating system is analized by using linear analysis method. For the analysis of unsteady heat transfer phenomena in each household, the method of using electric equivalent R-C circuit is applied.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.661-663
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• 1995

Chromosome analysis is an important and difficult task for clinical diagnosis for mutagen dosimetry, and for biological research. It is expensive, time consuming and imprecise when performed manually. Efforts to automate some or all of the procedures have continued for more than 30 years, with only limited success. An acquiring sample from chromosome group is not solved with automatic method. It is still performed by user. This paper represents the method of an automatic chromosome sample extraction which based on region splitting, and scan converted method.

• 반도체디스플레이기술학회지
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• 제20권4호
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• pp.114-118
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• 2021

In this research, the dimensional error of the measured specimen according to the measurement method was analyzed for the length, angle, radius of curvature and diameter using a projector which is used in industry. One-way analysis was performed on each data tested 30 times using a statistical technique. Through the experiment, it was found that an error occurred in each data when measuring the length and radius of curvature according to the measurement method, and the null hypothesis that no error occurred when measuring the angle and length was established. Based on this experimental data, the automatic measurement when measuring the projector causes less measurement error, so automatic measurement is recommended when measuring a small product. Also, an optimal measuring method is suggested for securing reliability on formulations of measurement automation.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.994-999
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• 2002

The Pendulum Automatic Dynamic Balancer is a device to reduce the unbalanced mass of rotors. For the analysis of dynamic stability and behavior, the nonlinear equations of motion for a system including the Pendulum Balancer are derived with respect to polar coordinate by Lagrange's equations. And the perturbation method is applied to find the equilibrium positions and to obtain the linear variation equations. Based on the linearized equations, the dynamic stability of the system around the equilibrium positions is investigated by the eigenvalue problem. Furthermore, in order to confirm the stability, the time responses for the system are computed from the nonlinear equations of motion.

• 한국정밀공학회지
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• 제12권8호
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• pp.122-130
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• 1995

To reduce the shock in shifting, the clutches and the brakes in automatic transmission have to be connected smoothly and disconnected rapidly. It is PCSV(Pressure Control Solenoid Valve) that paly this role of automatic transmission. In this paper, there were two steps in the analysis of the PCSV. The first step was modeling the elctromagnet by the permeance method. The second step was modeling the hydraulic circuit by the pressure differential equa- tion. In addition to this modeling, a experiment was performed and the commercial package program was used in order to justify modeling. The result of modeling coincide with the result of experiment and commercial package program. As a result, this modeling is usable in analysis of dynamic characteristics of the PCSV.

• 대한기계학회논문집B
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• 제30권3호
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• pp.270-277
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• 2006

Inverse radiation problems were solved for estimating boundary temperature distribution in a way of function estimation approach in an axisymmetric absorbing, emitting and scattering medium, given the measured radiative data. In order to reduce the computational time fur the calculation of sensitivity matrix, automatic differentiation and Broyden combined method were adopted, and their computational precision and efficiency were compared with the result obtained by finite difference approximation.. In inverse analysis, the effects of the precision of sensitivity matrix, the number of measurement points and measurement error on the estimation accuracy had been inspected using quasi-Newton method as an inverse method. Inverse solutions were validated with the result acquired by additional inverse methods of conjugate-gradient method or Levenberg-Marquardt method.

• 지구물리와물리탐사
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• 제16권4호
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• pp.225-233
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• 2013

효율적이고 객관적인 NMO 속도분석을 위해 사용되는 자동 속도분석의 정확성은 속도 빛띠의 속도 해상도에 많은 영향을 받는다. 본 연구에서는 고해상도 BDS (high-resolution Bootstrapped Differential Semblance)를 이용하여 속도 빛띠를 구성하고, 이를 이용하여 공통 중간점 모음 별로 병렬적으로 자동 속도분석을 수행하는 모듈을 개발하였다. 또한 이 고해상도 BDS를 이용하는 자동 속도분석 모듈의 속도분석 결과를 BDS (Bootstrapped Differential Semblance)를 이용한 자동 속도분석의 결과와 비교하였다. 수평층을 포함한 속도모델로부터 얻은 합성 탄성파 탐사자료를 생성하고 이를 이용하여 개발된 모듈을 검증한 결과 본 연구를 통해 개발된 모듈이 좀 더 정확한 속도를 추정하는 것을 확인하였다. 또한 현장자료에 개발된 모듈을 적용하여 이벤트의 연속성이 향상된 공통 중간점 겹쌓기 단면을 구할 수 있는 NMO 속도를 추정하였다.

• 사상체질의학회지
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• 제19권1호
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• pp.78-89
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• 2007

1. Objectives This is the comparative study with hand-operated measurement method & Automatic measurement method, in order to convert the automatic measurement method. 2. Methods We measured the body of patients(hand-operated width 5 places and hand-operated circumference 8 places, Automatic width 5 places) and analyzed the anthropometric data dividing into sex, age, BMI. 1057 patients's data are used in the analysis. 3. Results and Conclusions 1) 5th Width variable which was measured during lying down was not a sasang constitutional difference. 2) Diagnostic accuracy rate of the body measurement by Width which was measured during lying down and Width which IBS standing was 40-60%. 3) Diagnostic accuracy rate of Automatic & hand-operated measuring was not a big difference.

• 소성∙가공
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• 제12권3호
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• pp.194-201
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• 2003

An automatic quadrilateral mesh generator for large deformation finite element analysis such as metal forming simulation was developed. The NURBS interpolation method is used for modeling arbitrary 2-D free surface. This mesh generation technique is the modified paving algorithm, which is an advancing front technique with element-by-element resolving method for paving boundary intersection problem. The mesh density for higher analysis accuracy and less analysis time can be easily controlled with high-density points, maximum and minimum element size. A couple of application to large deformation finite element analysis is given as an example, which shows versatility and applicability of the proposed approach and the developed mesh generator for large deformation finite element analysis.