• 대한의용생체공학회:의공학회지
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• 제43권6호
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• pp.390-398
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• 2022

Ultrasound examination using ultrasound equipment is an ultrasound device that images human organs using sound waves and is used in various areas such as diagnosis, follow-up, and treatment of diseases. However, if the quality of ultrasound equipment is not guaranteed, the possibility of misdiagnosis increases, and the diagnosis rate decreases. Accordingly, The Korean Society of Radiology and Korea society of Ultrasound in Medicine presented guidelines for quality management of ultrasound equipment using ATS-539 phantom. The DenseNet201 classification algorithm shows 99.25% accuracy and 5.17% loss in the Dead Zone, 97.52% loss in Axial/Lateral Resolution, 96.98% accuracy and 20.64% loss in Sensitivity, 93.44% accuracy and 22.07% loss in the Gray scale and Dynamic Range. As a result, it is the best and is judged to be an algorithm that can be used for quantitative evaluation. Through this study, it can be seen that if quantitative evaluation using artificial intelligence is conducted in the qualitative evaluation item of ultrasonic equipment, the reliability of ultrasonic equipment can be increased with high accuracy.

• Advances in Traditional Medicine
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• 제6권2호
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• pp.112-120
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• 2006

The purpose of this study was to analyze whether quantitative evaluation of the color of the tongue substance using $L^*a^*b^*$ color coordinates system could minimize the problems arising from the different illuminating conditions or not. In controlled 4 different illuminating conditions (by natural light, flashlight, f-number, shutter speed),12 healthy subjects were photographed of their tongue substance through a digital camera (C-2100uz, Olympus Co.), both on the top surface and on the bottom surface of the tongue substance by two examiners, twice at 3 day intervals. Clinician evaluation was also performed grading the redness of the tongue substance in the form of 5-points scale by 6 clinicians. As a result, there was no significant difference in color differences between the color of the tongue substance and the reference red card in the 4 different illuminating conditions. Intra-rater reliability was satisfied and even though limitedly, inter-rater reliability was satisfied. Color differences were significantly correlated with the results by the clinicians, although they were applicable limitedly to specific illuminating conditions. Our results indicate that the application of the color differences in tongue diagnosis could not only evaluate the color information quantitatively, but also minimize the problems arising from the different illuminating conditions and that there was the significant difference in the visual evaluation of the red color of the tongue substance, both between the clinicians and between the illuminating conditions.

• 한국의류산업학회지
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• 제13권2호
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• pp.173-185
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• 2011

This study aimed to clarify the difference between consumers and hands-on staff in evaluation of the attributes importance of asset evaluation attributes and the relationship between difference from consumers and hands-on staff in evaluation of the attributes and the performance. Subjects for the quantitative research, quota sampling was adopted in the areas where the subject brands were in place, and 452 questionnaires (141 of hands-on staff, 311 of consumers) were analyzed. The results were as follows; 1. The factors that hands-on staff and consumers regarded as most important as to asset evaluation attributes of department store-exclusive importation brands included preference and product quality in the order, and then image, recognition, reliability, and country of origin in the case of hands-on staff, and reliability, image, recognition, and country of origin in the case of consumers in the order. 2. As a result of examining the effect of the difference between hands-on staff and consumers regarding exclusive importation brands(GAP, ZARA) of certain department stores on business achievement and consumer attitude, it turned out that the smaller the difference between the two groups with regard to evaluation, the higher the business achievement and consumer attitude.

• 한국산학기술학회논문지
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• 제10권8호
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• pp.1850-1859
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• 2009

디지털 저작권 관리 소프트웨어 신뢰성 품질 평가는 디지털 저작권 관리 소프트웨어의 품질 향상을 유도할 수 있는 기술로서 국제 표준을 수용하는 전략기술 개발을 통해 객관성과 활용도를 높일 수 있다. 본 연구에서는 디지털 저작권 관리 소프트웨어의 신뢰성 품질을 평가하기 위해 시험 메트릭을 제안하였으며, 품질을 측정하고 그 결과를 적절한 기준에 따라 판정하는 방법에 대해 연구를 수행하고 평가 사례를 제시하여 평가 방법을 명확히 제시하였다. 본 연구를 통해 디지털 저작권 관리 소프트웨어의 신뢰성 품질향상을 유도하고 디지털 저작권 관리 소프트웨어에 대한 양적/질적인 수요를 충족할 수 있다고 본다.

• 대한안전경영과학회지
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• 제9권3호
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• pp.49-54
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• 2007

신뢰성이란 단기간에 측정되는 성능과는 다른 지표로서 흔히 장기간에 걸쳐 평가되는 품질의 척도이다. Oil Cooler는 공작기계(machine tools)의 주축 및 구동부 등에서 발생하는 열 변형을 제어하는 장치로서 공작기계의 신뢰성 향상을 위해서는 oil cooler의 신뢰성 개선이 이루어져야 한다. 본 연구에서는 oil cooler의 신뢰성 개선을 위해 고장률 데이터베이스를 이용한 신뢰성 예측과 이를 통한 취약부품 분석을 실시하고 신뢰성 시험기를 통한 oil cooler의 신뢰성을 평가하였다. 이를 통해 oil cooler의 정량적 신뢰도를 계산하였으며 신뢰성호 향상을 위한 공정기법을 개발하여 적용하였다. Oil cooler의 신뢰성 개선을 통해 공작기계 및 반도체 제조 장비 등과 같은 제조 시스템의 신뢰성 향상을 기대할 수 있으며, 제안된 기법을 이용하여 다른 기계류 부품의 신뢰성 평가 및 개선에 적용할 수 있다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.559-564
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• 2000

Nuclear power plant structures amy be exposed to aggressive environmental effects that may cause their strength and stiffness to decrease over their service lives. Although the physics of these damage mechanisms are reasonably well understood and quantitative evaluation of their effects on time-dependent structural behavior is possible in some instances, such evaluations are generally very difficult and remain novel. The final goal of this study is to develop the reliability analysis of RC containment structures. The cause of the degrading is first clarified and the reliability assessment has been conducted. By introducing stochastic analysis based on random vibration theory, the reliability analysis which can determine the failure probabilities has been established.

• 한국해양공학회지
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• 제10권2호
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• pp.69-76
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• 1996

In-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. Experimental examinations and quantitative analysis were performed for the optimiaztion of similar friction welding of hydraulic valve spool steels(SNCM220, SCM435, SACM645, SCM415, ${\varphi}24). The quantitative correlations were found between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation periods of the welding and the fatigue life as well as weld strength and welding conditions. A real-time evaluation system was developed for the friction weld quality by AE.

• 한국구조물진단유지관리공학회 논문집
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• 제14권4호
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• pp.102-110
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• 2010

신뢰성평가는 고속철도교량에 포함된 불확실성의 영향을 고려하여 정량적 구조안전성을 검토하기 위한 효율적인 방안이며, 신뢰성평가에 기초한 기대생애주기비용은 고속철도교량의 합리적인 안전수준 및 설계기준을 제공할 것이다. 따라서 이 연구에서는 수치해석과 신뢰성평가 결과를 바탕으로 고속철도교량의 기대생애주기비용 및 최적설계 방안을 결정하고자 한다. 이를 위해, 고속철도교량의 표준설계를 기준으로 다양한 설계방안을 설정한 후, 각각의 설계방안에 대해 수치해석을 수행하였으며, 설계강도 한계상태방정식에 따른 신뢰성평가는 수치해석결과를 토대로 외적 불확실성의 영향을 고려하여 수행하였다. 고속철도교량의 기대생애주기비용은 각각의 설계방안에 따른 신뢰성평가 결과를 바탕으로 산정 하였다. 또한 최적설계 방안은 산정된 기대생애주기비용을 이용하여 결정하였다. 아울러, 최적설계 방안의 신뢰성평가 결과 및 기대생애주기비용에 대해 내적 불확실성의 영향을 고려하여 검토하였다. 이 연구결과는 고속철도교량의 체계적인 안전성 평가 및 최적 구조설계를 위한 기초자료로 활용될 것으로 기대된다.

• 대한간호학회지
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• 제41권4호
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• pp.510-519
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• 2011

Purpose: The purposes of this study were to identify the factors influencing service quality in nursing homes, and to develop an evaluation instrument for service quality. Methods: A three-phase process was employed for the study. 1) The important factors to evaluate the service quality in nursing homes were identified through a literature review, panel discussion and focus group interview, 2) the evaluation instrument was developed, and 3) validity and reliability of the study instrument were tested by factor analysis, Pearson correlation coefficient, Cronbach's ${\alpha}$ and Cohen's Kappa. Results: Factor analysis showed that the factors influencing service quality in nursing homes were healthcare, diet/assistance, therapy, environment and staff. To improve objectivity of the instrument, quantitative as well as qualitative evaluation approaches were adopted. The study instrument was developed with 30 items and showed acceptable construct validity. The criterion-related validity was a Pearson correlation coefficient of .85 in 151 care facilities. The internal consistency was Cronbach's ${\alpha}$=.95. Conclusion: The instrument has acceptable validity and a high degree of reliability. Staff in nursing homes can continuously improve and manage their services using the results of the evaluation instrument.

• 한국의류산업학회지
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• 제13권3호
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• pp.353-363
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• 2011

The purpose of this study was to deduce factors organization of brand equity for the exclusive imported brand by Department Store and to analyze it's influence on the performance. Subjects for the quantitative study, quota sampling was adopted in the areas where the subject brands were in place, and 452 questionnaires (141 of hands-on staff, 311 of consumers) were analyzed. The data were analyzed by using factors and reliability analysis, the independent sample t-test, and multiple regression analysis. The results were as follows; 1. The examining the effect of asset evaluation attributes of imported brands(GAP, ZARA) monopolized by certain department stores on business achievement and consumer attitude, it turned out that business achievement in hands-on staff's asset evaluation in view of business entity had meaningful difference according to the contract types of the brand, and that business achievement according to hands-on staff's evaluation and consumer attitude according to consumers' evaluation were different according to the brand asset value. 2. The examining the effect of consumer attitude according to consumers' evaluation, it turned out that preference had meaningful effect on both store preference and intention of re-purchase, while as to ZARA, image had meaningful effect on store preference and intention of re-purchase, and reliability on store preference.