• 센서학회지
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• 제26권6호
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• pp.371-378
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• 2017

An accurate and robust estimation of center of rotation (CoR) using optical marker trajectory is crucial in human biomechanics. In this regard, the performances of the two prevailing least-squares methods, the Gamage and Lasenby (GL) method, and the Chang and Pollard (CP) method, are verified in this paper. While both methods are sphere-fitting approaches in closed form and require no tuning parameters, they have not been thoroughly verified by comparison of their estimation accuracies. Furthermore, while for both methods, results for stationary CoR locations are presented, cases for perturbed CoR locations have not been investigated for any of them. In this paper, the estimation performances of the GL method and CP method are investigated by varying the range of motion (RoM) and noise amount, for both stationary and perturbed CoR locations. The difference in the estimation performance according to the variation in the amount of noise and RoM was clearly shown for both methods. However, the CP method outperformed the GL method, as seen in results from both the simulated and the experimental data. Particularly, when the RoM is small, the GL method failed to estimate the appropriate CoR while the CP method reasonably maintained the accuracy. In addition, the CP method showed a considerably better predictability in CoR estimation for the perturbed CoR location data than the GL method. Accordingly, it may be concluded that the CP method is more suitable than the GL method for CoR estimation when RoM is limited and CoR location is perturbed.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.345-350
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• 2000

Adaptive finite element analysis, which its solution error meets with the user defined allowable error, is recently used far improving reliability of finite element analysis results. This adaptive analysis is composed of two procedures; one is the error estimation of an analysis result and another is the reconstruction of finite elements. In the rp-method, an element size is controlled by relocating of nodal positions(r-method) and the order of an element shape function is determined by the hierarchical polynomial(p-method) corresponding to the element solution error. In order to show the effectiveness and accuracy of the suggested rp-method, various numerical examples were analyzed and these analysis results were examined by comparing with those obtained by the existed methods. As a result of this study, following conclusions are obtained. (1) rp-method is more accurate and effective than the r- and p-method. (2) The solution convergency of the rp-method is controlled by means of the iterative calculation numbers of the r- and p- method each other.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2005년도 추계 학술발표회 논문집
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• pp.13-17
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• 2005

In recent years, many people use R as a statistics system. R is frequently updated by many R project teams. We are interested in the method of multiple outlier detection and know that R is not supplied the method of multiple outlier detection. In this talk, we review these procedures for detecting multiple outliers and provide more efficient procedures combined with direct methods and indirect methods using R.

• Journal of Microbiology and Biotechnology
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• 제31권1호
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• pp.123-129
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• 2021

Polyhydroxyalkanoate (PHA) synthase is a key enzyme for PHA production in microorganisms. The class IV PHA synthase is composed of two subunits: PhaC and PhaR. The PhaR subunit, which encodes the phaR gene, is only present in class IV PHA synthases. Therefore, the phaR gene is used as a biomarker for bacteria that contain a class IV PHA synthase, such as some Bacillus spp. The phaR gene was developed to screen phaR-containing Bacillus spp. The phaR screening method involved two steps: phaR gene amplification by PCR and phaR amplicon detection using a DNA lateral flow assay. The screening method has a high specificity for phaR-containing Bacillus spp. The lowest amount of genomic DNA of B. thuringiensis ATCC 10792 that the phaR screening method could detect was 10 pg. This novel screening method improves the specificity and sensitivity of phaR gene screening and reduces the time and cost of the screening process, which could enhance the opportunity to discover good candidate PHA producers. Nevertheless, the screening method can certainly be used as a tool to screen phaR-containing Bacillus spp. from environmental samples.

• 대한전자공학회논문지
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• 제3권2호
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• pp.10-17
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• 1966

어떤 R-C 분포회로의 징분방정식의 해가 기지일 때 이것을 이용하여 다수의 다른 분포회로의 징분방정식의 해를 구하는 방법이 얻어졌다. 임의의 R-C 분포회로를 제작의 편의상 R(x)C(x)=일정인 회로로 등가변환하는 도해적방법이 얻어졌으며 해석적증명도 가능하다. 또 이론적 취급의 통일과 간단을 위하여 임의의 R-C분포회로를 R(x), C(x) 어느 한쪽이 일정한 분포회로로 등가변환하는 방법이 얻어졌다. 이 후자의 회로와 근사적인 집중정수회로를 생각하므로서 분포회로의 근사적인 해석, 합성이 비교적 간단하게 이루어 질 수 있다. 6x A method by which solutions of the differential equations of any other distributed circuits can be obtained is described when the solution of the differential equation of an R-C distributed amplifier is known. A graphical method of transforming any R-C ditributed circuit into an equivalent circuit which has a constant R(x)-C(x) was also obtained. The theoretical verification of this method is possible. For simplicity, any R-C distributed circuit can be transformed into an equivalent circuit which is a distributed circuit of either constant R(x) or C(x). Using this equivalent circuit and considering a lumped circuit, an approximate analysis and synthesis can be made simply.

• 한국압력기기공학회 논문집
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• 제12권2호
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• pp.34-39
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• 2016

This paper presents a method to quantify R-ratio effect on J-integral under large-amplitude cyclic loading condition. Generally, monotonic tearing resistance curves are used to assess stability of cracked nuclear piping under seismic loading. However, it is well known that fracture toughness decrease at cyclic loading condition, according to R-ratio. For this reason, it is important to quantify the J-R curves under cyclic loading condition. To quantify the R-ratio effect, correction method which was proposed by Tranchand is considered. This method considers crack opening area in order to calculate modified J-integral. This method leads to an increase of fracture toughness. At R=-0.5 case, this method is good agreement with monotonic J-R curves. However, results show that this method has a limit to apply a large R-ratio case.

• Restorative Dentistry and Endodontics
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• 제31권1호
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• pp.11-19
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• 2006

이 연구의 목적은 $ProTaper\^{(R)}$ S1과 3가지 종류의 파일을 각각 같이 사용하는 혼합법의 근관성형 효율을 비교해 보는 것이다. 5년 이상의 임상경력을 가진 치과의사 20명이 Ni-Ti파일 경험자군과 비경험자군으로 나뉘어, $ProTaper\^{(R)}$만을 사용한 C군과 $ProTaper\^{(R)}$ S1과 함께 세 종류의 파일 시스템- $ProFile\^{(R)}$ (P군), $HeroShaper\^{(R)}$ (H군), $K-Flexofile\^{(R)}$ (S군)을 혼합 적용하여, 각각의 방법으로 레진 근관을 성형하였다. 성형 전후 이미지를 중첩 시켜 근관형태 이상을 조사하고, 근단공부터 1, 2, 3mm 위치에서 근관 폭경의 변화량, 중심 변위율을 산출, 비교하여 다음의 결과를 얻었다. C군과 S군 모두 다른 실험군에 비해 성형시간이 많이 소요되었다. 경험자군에 비해 비경험자군에서는 C군과 H군에서 더 많은 시간이 소요되었다 P군의 중심변위율은 $ProTaper\^{(R)}$만을 사용한 C군이나 SS파일을 사용한 S군보다 양호하였다. 마찬가지로, 경험자군의 경우에서는 P군에 추가하여 H군도 더 나은 결과를 보였다 (p<0.05). 이 실험 조건하에, $ProFile\^{(R)}$과 $HeroShaper\^{(R)}$를 사용한 혼합법이 $ProTaper\^{(R)}$만을 사용한 성형방법보다 더욱 추천된다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.700-702
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• 2008

A new evaluation method which named 'Security Viewing Angle Factor (SVAF)' was suggested for VIC (Viewing-angle Image Control) technology to quantify a visual hiding performance of LCD. Currently, Contrast Ration (CR) is the general method to evaluate VIC technology. However, CR shows a significant difference when compared with the result of human visual system. Furthermore, a perceptional evaluation method and its conditions were established.

• 산업경영시스템학회지
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• 제37권3호
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• pp.82-88
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• 2014

The government expands its investment on R&D programs for economic growth, thus there is growing attention on the result of R&D Programs. This study proposes more improved measuring method for efficiency when the number of R&D programs is not enough to be for measuring efficiency analysis. It provides more various application method of factors on efficiency analysis. This study analyzes the influence of each input factor on efficiency by using partial efficiency concept. And it also determines input factors in similar influence throughout Spearman correlation coefficient. Finally, it suggests new method to improve discriminatory power of efficiency analysis by determining representative factors. Also, the proposed method can be practiced not only for national R&D programs, but also for other fields of research.

• 한국컴퓨터정보학회논문지
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• 제18권1호
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• pp.93-101
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• 2013

심전도 신호에서 R-파는 다른 특징 점을 구하는데 중요한 역할을 할 뿐만 아니라 심장에 대한 많은 의학적인 정보를 가지고 있다. 지금까지의 연구는 심전도 신호 형태에 대한 분석을 통하여 R-파를 검출하였으나, R-파와 비슷한 형태의 P-파가 나타날 경우 정확한 R-파 검출이 어려웠다. 본 논문에서는 세포막이 흥분 후에 탈분극과 재 분극 기간인 불응기와 불응기내 파형의 첨도 형태를 이용하여 R-파를 검출하는 방식을 제시하였다. MIT-BIH 부정맥 데이터베이스에 있는 심전도 신호 대한 실험을 통하여 R-파와 유사한 형태의 P-파를 가진 105번과 108번 레코드뿐만 아니라 다른 레코드에서도 기존의 방식보다 비교적 우수한 검출율을 확인하였다.