• Korean Journal of Applied Biomechanics
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• v.19 no.3
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• pp.467-479
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• 2009

The purpose of this study was to present the quantitative data which riders can utilize teaching field by comparison analysis of kinematics according to skill level of rider during 2 strides rising trot with the JeJu's-Horse. Participated subjects was consisted of total 10 riders(unskilled: n=5, skilled: n=5). The method of experiment & analysis was based on 3D cinematography. Variables were consisted of temporal, linear & angular kinematics by each event & phase. The skilled assigned more ratio of elapsed time in air than support phase, had the less range of motion in up-down direction and more consistent velocity in lateral & forward direction and performed periodic up-down movement with alignment in vertical direction according to elapsing of phases. The skilled more flexed at elbow and extended backwardly according to elapsing of phases, while more flexed forwardly at hip & knee and plantarflexion at ankle. The skilled postured backward extension but the unskilled do forward flexion. That is, It was considered that the unskilled continued more unstable posture than the skilled during 2 strides in rising trot.

• Proceedings of the Safety Management and Science Conference
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• 2011.04a
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• pp.319-328
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• 2011

It has been very important to have an exact evaluation for risk factors in order to prevent MSDs(Musculoskeletal Disorders). However, most MSDs evaluation checklists have always been some problems of possibilities associated with subjective evaluation. Therefore, this study tried to conduct a sort of sensitivity analysis on three major evaluation checklists(OWAS, RULA, REBA). Specifically, major subjects in the study consisted of three parts as follows; comparison of the results between experienced and inexperienced subjects, analysis for the consistency of the results in terms of different evaluation times. The results of the study were summarized as follows; 1) There was statistically significant difference of the results by RULA and by REBA between experienced and inexperienced subjects. This might due to the fact that experienced subjects have had better ability to detect the bad working posture during evaluation. However, the results by OWAS did not give any significantly different results between experienced and inexperienced subjects., 2) All three checklists showed significantly different results in terms of different evaluation times. Further study on this subject would eventually provide a sophisticated evaluating guidelines for MSDs regarding determination of subject-specific evaluation, identification of repetitive number of evaluations for stable results for each checklist, determination of job-specific evaluation methods, and so on.

• Analytical Science and Technology
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• v.15 no.5
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• pp.433-438
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• 2002

Trace elements in two air filters (V-50, P-50) artificially loaded with urban dust provided from IAEA were determined non-destructively using instrumental neutron activation analysis. Standard reference material (Urban Particulate Matter, SRM 1648) of National Institute of Standard and Technology was used for analytical quality control. About 20 elements in both of loaded filter samples were determined. To evaluate inter-laboratory comparison and proficiency test, analytical data were statistically treated with the results which collected from 49 laboratories, 40 countries participated in this study using neutron activation analysis, particle induced X-ray emission, inductively coupled plasma mass spectroscopy, etc,. From the results of statistical treatment, Z-scores are within ${\pm}2$. Furthermore, accuracy and precision of obtained analytical values are passed according to the criteria of the proficiency test. Consequently, it was proved that analytical quality for air dust samples being performed has been controlled properly.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.18-27
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• 2020

This study compared and analyzed the results of proficiency testing between testers based on the international standard ISO/IEC 17043 proficiency testing requirements using ISO/IEC 25023 software quality characteristics evaluation. Application of the test was submitted to the KASTO as a software test in the electric test field defined by KOLAS. Among ISO/IEC 25023, the evaluation items for proficiency testing between testers were selected as functional completeness and time behavior. The comparison test between testers was carried out on May 28, 2019 at the accredited LG Electronics SW Laboratory in Seoul and attended by KOLAS assessors. The test evaluation method was measured once per tester with functional completeness, and measurement was repeated 10 times per tester according to time behavior. As a result, in the case of functional completeness, all 12 test steps were passed, and the satisfaction was evaluated. Time behavior was repeated 10 times, and the mean was 9.45 ± 0.01 seconds for testers 1 and 3 and 9.52 ± 0.0 seconds for tester 2, but there was no statistically significant difference. In conclusion, the proficiency of the testers was equal, and the reliability of the test results of the test institute was confirmed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.238-238
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• 2003

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2009.10a
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• pp.239-242
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• 2009

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.282-285
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• 2011

효과적인 수술 훈련 시뮬레이터를 구축하기 위해서는 사실적인 훈련 환경을 제공하는 것뿐만 아니라 훈련 결과를 바탕으로 사용자의 숙련도를 객관적으로 측정하고 평가하는 과정 또한 중요하다. 이를 위해 본 연구는 수술 훈련 중 큰 비중을 차지하는 절개 동작에 대한 정량적 평가 척도를 제공하는 것을 목표로 한다. 사용자가 가상 장기 모델에 대해 절개를 수행하는 동안 평가 시스템은 절개 경로와 깊이를 일정 간격으로 샘플링하여 저장하고, 이를 두 곡선 간의 유사성 측정 알고리즘을 통해 훈련 시나리오 상에 정의된 표준 절개 경로와 깊이, 속도를 각각 비교한다. 이렇게 계산된 두 경로 사이의 거리가 가까울수록 유사성이 높은 것으로 간주하며, 사전에 설정된 기준치 이상의 유사성을 기록할 경우 훈련 목표를 충족한 것으로 판단할 수 있다. 본 연구에서는 단순 거리 측정에 의존한 일반적인 경로의 유사성 판단 알고리즘의 문제점을 제시하고, 전체 절개 경로의 길이 대비 현재까지 진행된 정도를 매개변수로 하는 방법을 이용하여 절개 경로의 방향을 고려한 유사성 측정 알고리즘을 제안하였다. 이와 같이 정량적이며 자동화된 절개 숙련도 평가 기법을 제안함으로써 사용자의 훈련 결과에 대해 보다 객관적인 피드백을 제공 할 수 있다.

• Journal of the Korean Chemical Society
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• v.57 no.1
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• pp.40-51
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• 2013

In order to develop a quantitation method for Perfluorooctanesulfonic acid(PFOS) contained in plastics that are mainly used in electric and electronic equipment, this study consisted of conducting method validations with LDPE samples using soxhlet solvent extraction and LC/MS. As a result, the limits of detection and quantitation (LOD, LOQ) were $2.58{\mu}g/L$ and $7.82{\mu}g/L$, respectively. Additionally, the recovery was 96-102%. For the correlation coefficient of LC/MS, the $r^2$ value was 0.9992 in the concentration range of $7.82-100{\mu}g/L$, which confirmed its linearity. Furthermore, for the standardization of the analysis method for PFOS in electric and electronic equipment to correspond to EU environmental regulations, we conducted a proficiency test with a number of domestic and international testing laboratories. Three of the ten testing laboratories that participated in the proficiency test submitted outliers. Accordingly, we examined the cause of the outliers using the $^{19}F$ NMR, finding that the main cause was an error in the processing of the results for isomers in PFOS that existed in standard solutions and samples.

• Journal of the Korea Organic Resources Recycling Association
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• v.29 no.2
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• pp.25-30
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• 2021

This study investigated how the indicators of quality control are improved by proficiency in the measurement of phosphate concentration. In addition, analysis equipments were to be compared to see if there were any differences in measurements depending on the type of analysis device. In order to find out the effect of the proficiency of the analyst on the analysis results, three analysts measured phosphate concentration seven times in accordance with the Korean water pollution test standards, and met the quality control indices if repeated more than five times. The limit of quantification for phosphate was calculated at 0.02 mg/L. If the analysis devices are different, the absorbance and concentration of the samples near the limit of quantification are statistically significant difference.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.263-264
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• 2006