• 한국지반공학회논문집
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• 제26권7호
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• pp.161-170
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• 2010

기초구조물의 저항계수 산정 및 하중저항계수설계법의 개발을 위해서는 충분한 양의 데이터베이스 구축을 바탕으로 정확한 신뢰성 분석이 수행되어야 한다. 기존 국내외 말뚝기초의 신뢰성 분석 연구에서는 말뚝의 측정지지력 확인이 가능한 재하시험 자료만을 이용하여 저항편향계수의 분포특성을 산정하였다. 따라서, 파괴에 이르지 않은 말뚝재하시험 자료는 신뢰성 분석에서 제외되었다. 본 연구에서는 베이지안 이론을 이용하여 타입강관말뚝 저항편향계수의 사전 분포특성에 측정지지력을 확인할 수 없는 재하시험 결과를 추가하여 현장 특성을 반영한 저항편향계수의 사후분포특성을 산정하였다. 그리고 저항편향계수의 사후분포특성을 이용하여 말뚝의 신뢰성 평가를 수행하고 신뢰도수준을 갱신하였다. 국내 전역에서 수행된 양질의 정재하시험 자료를 수집, 분석하여 57개의 자료에 대한 측정지지력을 확인하였고, 이들 자료에 대해서 구조물기초설계기준에서 제안하고 있는 Meyerhof 공식을 이용하여 설계지지력을 산정하였다. 이를 통해 저항편향계수의 사전분포 특성을 정량화 하였으며, 베이지안 기법을 적용하여 다양한 현장재하시험 결과에 따라 저항편향계수의 사후분포를 산정하였다. 갱신된 저항편향계수 통계특성을 적용하여 일차신뢰도법을 이용하여 강도 높은 신뢰성 해석을 수행하고 시험결과에 따른 신뢰도 수준을 평가하였다. 본 연구에서 제시된 방법을 통해 양질의 측정지지력 데이터가 부족한 경우 베이지안 기법을 이용하여 신뢰성 분석이 가능함을 확인하였다.

• International Journal of Reliability and Applications
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• 제13권1호
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• pp.49-56
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• 2012

Using total time on test transform (TTT), a new approach is taken for testing exponentiality versus the unknown age, exponential better than equilibrium life in convex ordering (EBELC). Selected critical values are tabulated for sample size n =2(2)50 and powers of the test are estimated for some commonly used distributions in reliability. Finally real example is presented to illustrate the theoretical results.

• The Journal of Korean Physical Therapy
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• 제28권2호
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• pp.124-127
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• 2016

Purpose: The flexor hallucis longus stretch test can determine the shortness of the flexor hallucis longus muscle by measuring the angle of extension in the first metatarsophalangeal (MTP) joint at maximum ankle dorsiflexion. Less than 30 degrees of the first MTP joint at the maximal ankle dorsiflexion indicates shortness of the flexor hallucis longus muscle. The purpose of this study was to examine the intra- and inter-reliability of the flexor hallucis longus stretch test in subjects with asymmetric hallux valgus (HV) angles. Methods: Sixteen subjects with asymmetric HV angles participated in this study. In sitting position, dorsiflexion angles of the first MTP joint were measured with maximum ankle dorsiflexion on each side. ICC (3,1) and ICC (3,k) models were used, respectively, to assess the intra-reliability and inter-reliability of the flexor hallucis longus stretch test. The paired-t test was used to compare the dorsiflexion angle of the first MTP joint on the side with the smaller HV angle with that of the side with the larger HV angle. Results: The results of the study showed that both intra- and inter-reliability were more than 0.95 of the coefficient. Dorsiflexion angle of the first MTP joint was higher on the side with the smaller HV angle. Conclusion: Use of the flexor hallucis longus stretch test is acceptable in clinical settings because both intra- and inter-reliability were high in subjects with asymmetric HV angles. In addition, shortness of the flexor hallucis longus muscle is associated with HV angle. This study provides useful information for use in management of HV deformity.

• 한국전문물리치료학회지
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• 제24권3호
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• pp.40-46
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• 2017

Background: The active knee extension (AKE) test commonly used to assess the flexibility of the hamstring muscles. Many researchers have tested the reliability of the AKE test; however, no published studies have examined the intrarater and interrater reliability of the AKE test using a PBU. Objects: The purpose of this study was to determine the intrarater and interrater reliability of the AKE test performed with a pressure biofeedback unit (PBU) on healthy subjects. Methods: Sixteen healthy male participants volunteered and gave informed consent to participate in this study. Two raters conducted AKE tests independently with a PBU. Each knee was measured twice, and the AKE testing was repeated one week after the first round of testing. Results: The interrater reliability's intraclass correlation coefficients ($ICC_{2,1}$) were .887~.986 for the right knees and .915~.988 for the left knees. In addition, the intrarater (test-retest) reliability ($ICC_{3,1}$) values ranged between .820~.915 and .820~.884 for Raters 1 and 2, respectively. The values for the standard error of mesurement were low for all tests ($.81{\sim}2.97^{\circ}$); the calculated minimum detectable change was $2.24{\sim}8.21^{\circ}$. Conclusion: These findings suggest that the AKE test performed with a PBU had excellent interrater and intrarater reliability for assessing hamstring flexibility in healthy young males.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.951-954
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• 2004

We report the recent reliability test results of SpatiaLight's liquid crystal on Silicon (LCOS) microdisplays. Two different types of reliability tests have been performed: 1) thermal and 2) thermal with high intensity UV light. Various important device parameters were regularly monitored including the contrast ratio, color uniformity, and switching time. The test data shows that there are no degradations that fail the pass criteria. Lifetime estimations are given from the test data.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.519-522
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• 2003

'KRS 6330-3256라' standard regulates performance test of insulating transformer for protecting the electronic interlock linkage equipment which is being done by test procedures and methods according to the standard. The balance/unbalance test evaluating the performance of transformer are applied by impulse voltage($l2/200{\mu}s$) but affected by many other factors. Therefore, the review about these is necessary to have the reliability and reappearance of test results. In this paper, we have simulated about several phenomenon appearing in real balance/unbalance test and compared simulated results with real ones. With the basis of these results, the influence to test result of inner and outer factors are investigated and analyzed and established the plan boosting the reliability and reappearance of test results.

• 한국신뢰성학회지:신뢰성응용연구
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• 제5권1호
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• pp.149-165
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• 2005

Air spring system was accepted for railway vehicle secondary suspension to reduce and absorb the vibration and noise. The low natural frequency ensures a comfortable ride and an invariably good stiffness. In this paper, the characteristics and durability test was conducted in laboratory by using servo-hydraulic fatigue testing system to reliability evaluation of air spring for electric railway vehicle. The experimental results show that the characteristics and durability of domestic development productions are obtained the good results. And to guarantee the adaption of air spring, the ride comfort and air pressure variation were measured in train test on subway line.

• The Journal of Korean Physical Therapy
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• 제22권6호
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• pp.35-42
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• 2010

Purpose: To investigate the rater reliability of a Pediatric Balance Scale (PBS) for children with cerebral palsy, and to investigate possible differences among raters according to their clinical work experience and testing experience. Methods: Study participants included 18 children with spastic cerebral palsy who could walk. They were instructed by pediatric physical therapists, two of whom had ten years of clinical work experience and two who had less than one year of experience. The children's ability to achieve physical balance was videotaped for PBS items. The raters watched the tapes and evaluated each child twice. Rater reliability was analyzed using the intraclass correlation coefficient (ICC). Differences between experienced and novice raters were analyzed using a paired t-test. The statistical significance level was set to 0.05. Results: The total PBS scores averaged 45.78~48.00 and 45.72~47.67 for first and second tests. Intra-rater reliability was very high (ICC=0.89~0.99), and the repeated measurement coincidence was high (p>0.05). Inter-rater reliability was high (ICC=0.83~0.84), but there was a bit of a difference in the coincidence (p<0.05). The experienced raters' reliability and coincidence were higher than those of the novices, and there were differences in reliance and coincidence between experienced and novice raters (p<0.05). Conclusion: Inter-rater and intra-rater reliability is very high. However, rater reliability showed defferences depending on clinical work experience and testing experience. When testing pediatric patients with the PBS, the rater's clinical experience and test experience may affect the test results.

• 근관절건강학회지
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• 제17권2호
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• pp.183-191
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• 2010

Purpose: The purpose of this study was to test the validity and reliability of the Diabetes Self-Care Barriers Assessment Scaler for Older Adults (DSCB-OA) in Korean older adults with type 2 diabetes. Method: To develop Korean version DSCB-OA used translation and back-translation method. Then, Korean version DSCB-OA was analyzed using data of 278 older adults with type 2 diabetes. Cronbach's alpha coefficient, item to total correlation and test-retest reliability was used for the reliability test, and factor analysis was used for the construct validity. Results: Cronabach's alpha of the DSCB-OA was.77, and item to total correlation coefficient ranged from -.13 to.56. The results of factor analysis showed DSCB-OA consisted of four factors(diet, exercise, blood sugar test, treatment) which explained 62.8% of total variance. Conclusion: The Diabetes Self-Care Barriers Assessment Scaler for Older Adults (DSCB-OA) was confirmed helpful tool for Korean older adults with type 2 diabetes.

• 대한물리의학회지
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• 제8권2호
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• pp.209-217
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• 2013

PURPOSE: The purpose of this study was to investigate the clinical availability of the pendulum test (through reliability and validity) using a NK table attached electrogoniometer for spasticity measurement in patients with brain lesions. METHODS: Thirty-one stroke and traumatic brain injury subjects participated in the study. Intraclass correlation coefficient (ICC) was used to verify the test-retest reliability of spasticity measures of the pendulum test. Pearson's product correlation coefficient was used to examine the validity of the pendulum test through the amplitude of the deep tendon reflex (DTR) test known for objective and quantitative measure of spasticity. RESULTS: In these results, the test-retest reliability was showed significantly high correlation between pendulum tests (ICCs=.95~.97, p<.01). There were significant negative correlations between the amplitude of the DTR test and all measures of spasticity of the pendulum test(r=-.77~-.85, p<.01). CONCLUSION: Thus, it is possible to use the pendulum test using a NK table as an objective measure of spasticity, rather than other expensive equipment, which is more complicated to use. Further studies are needed to explore the therapeutic effects of spasticity using a newly designed pendulum test equipment in this study.