• 방송공학회논문지
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• 제18권1호
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• pp.1-9
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• 2013

모델 기반 카메라 추적에서 추적을 위해 사용되는 3차원 객체 모델의 정확도는 매우 중요하다. 하지만 3차원 객체의 실측 모델링은 일반적으로 정교한 작업을 요구할 뿐만 아니라, 오차 없이 모델링하기가 매우 어렵다. 반면에 오차를 포함하고 있는 3차원 객체 모델을 이용하더라도 모델링 오차에 의해서 계산되는 추적 오차와 실제 사용자의 육안으로 느끼는 추적 오차는 다를 수 있다. 이는 처리비용이 높은 정밀한 모델링 과정을 요구하지 않더라도 사용자가 느끼는 오차 허용 범위 내에서 추적을 위한 객체 모델링을 효과적으로 수행할 수 있기에 중요한 측면이 된다. 따라서 본 논문에서는 모델 기반 카메라 추적에서 모델링 오차에 따른 실제 정합 오차와 사용자의 육안으로 인지되는 정합 오차를 사용자 평가를 통해 비교 분석하고, 3차원 객체 모델링의 허용 오차 범위에 대해 논의한다.

• 한국엔터테인먼트산업학회논문지
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• 제14권8호
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• pp.213-219
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• 2020

본 연구는 치매의심군 8명, 치매확정군 9명 및 정상군 10명을 대상으로 명명하기 과제에서 오류 유형의 특성을 탐색하는 데 그 목적이 있다. 명명하기의 오류 분석 항목은 시지각적 오류, 의미적 연관 오류, 의미적 비연관 오류, 음소적 오류, 모름, 무반응으로 구분하여 분석하였다. 분석을 위해 SPSS 21.0을 활용하여, 기술통계분석, 분산분석, 다변량분산분석을 실시하였다. 연구결과, 오류유형에 따라 집단 간 오류율에는 유의한 차이는 있는 것으로 나타났다. 정상군이 다른 두 집단과 유의한 차이를 보인 오류는 시지각 오류와 의미적 비연관 오류이며, 무응답 오류는 치매확정군과는 차이가 있었으나, 치매의심군과는 유의한 차이가 없는 것으로 나타났다. 이러한 연구 결과, 알츠하이머성 치매 환자들이 그림 명명하기 능력에 결함이 있음을 확인하였다. 또한 정보처리과정 중 특정 단계의 퇴행으로 인한 결함이 심해지면 다른 단서를 제공하는 것이 적절하다는 것을 알 수 있었다.

• 한국측량학회지
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• 제39권5호
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• pp.253-263
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• 2021

Traffic data collected using advanced equipment are highly valuable for traffic planning and efficient road operation. However, there is a problem regarding the reliability of the analysis results due to equipment defects, errors in the data aggregation process, and missing data. Unlike other detectors installed for each vehicle lane, radar detectors can yield different error types because they detect all traffic volume in multilane two-way roads via a single installation external to the roadway. For the traffic data of a radar detector to be representative of reliable data, the error factors of the radar detector must be analyzed. This study presents a field survey of variables that may cause errors in traffic volume collection by targeting the points where radar detectors are installed. Video traffic data are used to determine the errors in traffic measured by a radar detector. This study establishes three types of radar detector traffic errors, i.e., artificial, mechanical, and complex errors. Among these types, it is difficult to determine the cause of the errors due to several complex factors. To solve this problem, this study developed a radar detector traffic volume error analysis model using a multiple linear regression model. The results indicate that the characteristics of the detector, road facilities, geometry, and other traffic environment factors affect errors in traffic volume detection.

• 한국정밀공학회지
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• 제10권2호
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• pp.54-65
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• 1993

The paper describes and alternative method based on a new idea to measure the circular movement of machining centers. ISO has employed three testing methods for the acceptance tests of machine tools; the first is a rotating one-dimensional probe method, the second is a two-dimensional probe and a master circular ring, and the third is a kinematic ball bar. The last two methods were proposed and introduced by W. Knapp and J. B. Bryan, respectively. The newly developed method is superior to above two methods; the rotating angle can be detected and the rotating radius is variable. Circular movement errors of machining centers were investigated by the analysis of data measured by R- .THETA. method. Followint observations are obtained 1) The errors which depend on positions, i.e., periodical errors by the pitch of ball screws, errors by compensation of backlash and errors by perpendicularity of X and Y-axis, were analyzed. 2) The errors which depend on NC control system, i.e., errors by the unbalance of position-loop-gaians, errors by velocity-loop-gains and errors by feed speeds, were quantiatively analyzed. 3) The method of extracting error information, which uses moving technique of averaging angle and fourier's analysis data mesured by the R- .THETA. method, was proposed.

• 성인간호학회지
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• 제27권6호
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• pp.673-683
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• 2015

Purpose: This study was aimed to identify the mediating and moderating effects of safety-specific transformational leadership on the relationship between barrier to and intention of reporting medication errors. Methods: Two hundred thirty seven nurses from seven different hospitals participated in the study. Safety-specific transformational leadership was measured by an instrument with 10 items, barrier to reporting medication errors with 16 items, and intention of reporting medication errors with 3 items. The data was collected from September to October 2012. Descriptive statistics, factor analysis, t-test, ANOVA, Pearson correlation coefficient and a hierarchial regression analysis were used. Results: There were significant negative correlations between the subcategories of barrier to reporting medication errors and intention of reporting medication errors (r=-.16~-.27, p<.001), and a positive correlation between the intention and safety-specific transformational leadership (r=.25, p<001). Transformational leadership was a mediator between barrier to and intention of reporting medication errors. Conclusion: Safety-specific transformational leadership mediated the relationships between barrier to and intention of reporting medication errors. Enhancing safety-specific transformational leadership of nursing unit managers is necessary to increase the intention to reporting medication errors.

• International Journal of Precision Engineering and Manufacturing
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• 제4권2호
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• pp.64-70
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• 2003

A new method using a transfer function is introduced in the present paper for analyzing the motion errors of hydrostatic bearing tables. The relationship between film reaction force in a single-side hydrostatic pad and the form error of guide rail is derived at various spatial frequencies by finite element analysis, and it is expressed as a transfer function. This transfer function clarifies so called 'the averaging effect of an oil film' quantitively. It is found that the amplitude of film force is reduced as the spatial frequency increases or the relative width of the pocket is reduced. The motion errors of a multi pad type table are estimated using a transfer function, the form errors of a guide rail and the geometric relationship between the pads. The method is named as the Transfer Function Method (TFM). The motion errors calculated by the TFM show good agreement with the motion errors calculated by the Multi Pad Method considering the entire table as an analysis object. From the results, it is confirmed that the proposed TFM is very effective to analyze the motion errors of hydrostatic tables.

• 한국정밀공학회지
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• 제19권5호
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• pp.56-63
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• 2002

A new model utilizing a transfer function is introduced in the present paper for analizing motion errors of hydrostatic tables. Relationship between film reaction force in a single hydrostatic pad and form error of a guide rail is derived at various spacial frequencies by finite element analysis, and it is expressed as a transfer function. This transfer function clarifies so called averaging effect of the oil film quantitively. For example, it is found that the amplitide of the film reaction farce is reduced as the spacial frequency increases or relative width of the pocket is reduced. Motion errors of a multiple pad table is estimated from transfer function, geomatric relationship between each pads and form errors of a guide rail, which is named as Transfer Function Method(TFM). Calculated motion errors by TFM show good agreement with motion errors calculated by Multi Pad Method, which is considered entire table as an analysis object. From the results, it is confirmed that the proposed TFM is very effective to analyze the motion errors of hydrostatic tables.

• 문화기술의 융합
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• 제8권4호
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• pp.199-204
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• 2022

본 연구의 목적은 기계번역을 활용한 대학교 영어쓰기 수업에서 한-영 기계번역 결과물에 나타난 형태적 및 구문적 오류 유형과 그에 대한 원인을 분석하기 위한 것이다. 한국의 EFL 대학생 7명이 연구에 참여하였으며, 그들은 한 학기동안 총 3회의 영어쓰기 과제를 수행하였다. 본 연구에서는 학생들이 제출한 영어쓰기 결과물 중 기계번역 결과물에 나타난 형태적 및 구문적 오류의 유형을 분석하였으며, 우리말 초고와 비교 분석을 통하여 그 원인을 찾아보고자 하였다. 분석결과, 기계번역 결과물에서 가장 많이 발생한 오류는 문장구조와 표기법 관련 오류였으며, 기계번역 결과물에서 발생한 대부분의 오류는 한국어 원문의 오류로 인하여 발생한 것으로 파악되었다.

• 센서학회지
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• 제32권1호
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• pp.55-61
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• 2023

The objective of this study is to determine the concentrations of mixed gases by establishing a diagnosis method of a transformer using tunable-wavelength optical infrared sensors. Absorption of infrared light by methane, acetylene, and ethylene gases injected is measured from the outputs of the infrared sensors. Regression analysis equations of the gas concentrations are acquired from their respective measured absorption. The obtained concentrations are as follows: -3-9 % errors above 600 ppm(methane), 3 % errors above 1200 ppm(acetylene), and 10 % errors above 500 ppm(ethylene). The concentration inference equations obtained using the individual gases are applicable when the absorption wavelength bands do not overlap. The results of the fault analysis of a transformer using the Duval triangle method and the tunable infrared gas sensors are as follows: temperature faults with -1-1% errors and energy faults with -7-7 % errors.

• 한국정밀공학회지
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• 제18권6호
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• pp.87-92
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• 2001

An error analysis is very important for a precision machine to estimate its performances. This study proposes a new parallel device, cubic parallel manipulator. Errors of the proposed cubic parallel manipulator include upper and down universal joint errors, due to the directional changes in the forces in the links, and actuation errors. An error analysis is presented based on an error model formed through the relation between the universal joint errors of the cubic parallel manipulator and the end effector accuracy. The analysis shows that the method can be used in predicting the accuracy of other cubic parallel devices.