• Title, Summary, Keyword: reliability index

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A Study on Efficient Noise Filtering of Patent Data Analysis and Level Assessment of Patent Technology which improve reliability (특허 데이터 분석시 효율적인 노이즈 제거와 신뢰도가 향상된 특허 기술수준 평가에 관한 연구)

  • Kang, Hee-Seop;Lee, Seung-Ho
    • Journal of Korea Technology Innovation Society
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    • v.15 no.1
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    • pp.105-128
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    • 2012
  • This paper proposes the technological level assessment which improved reliability and the efficient noise elimination methods in the process of establishing patent map analysis data. In order to eliminate efficiently noise (removed by the manual process in the past), the paper applies the Logical Operator 'AND', makes it a program in excel VBA(Visual Basic Application), and obtains the valid data. For the improved reliability technological level assessment of the patents, the study calculates average number of claims, Patent Family Size(PFS), Cites Per Patent (CPP), Triad Patent Families, Standardization Patent Diversification Index (stdPCPI), and haF-index(Hirsch a Family index). The result which applied noise exclusion work showed less than 10% of acquired patent data ratio and confirmed high reliability. The result that apply proposed technological level assessment index makes sure that balanced technological level assessment which improved reliability by producing synthetic technological level assessment.

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Development of Bridge Inspection Reliability and Improvement Strategy (교량 점검신뢰도 분석법 개발과 향상방안)

  • Jeong, Yo-Seok;Kim, Woo-Seok;Lee, Il-Keun;Lee, Jae-Ha
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.5
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    • pp.50-57
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    • 2016
  • The present study proposed three inspection reliability indices which compared inspection results evaluated at in-depth(routine) inspection and in-depth safety inspection; Nominal inspection reliability index, Real inspection reliability index, and DS nominal inspection reliability index. The methods to improve the inspection reliability were also proposed. Since bridge inspection process is critical to ensuring the safety of bridges and identifying repair and maintenance needs, the quality of the inspection data produced from the inspection process is very important. Consequently, the inspection reliability indices were suggested to evaluate quality of current inspection practices. Specifically, approximately 85% of inspection errors evaluated by the DS nominal inspection reliability index are within 1 rating grade(equal to or less than damage score ${\pm}0.1$). In order to improve the inspection reliability, transportation agency should implement QC(Quality Control) practices and develop professional expertises of inspectors by higher requirements for inspectors, on-off line inspection training and etc.

Validity and Reliability of the Plaque Score Using Qraycam (Qraycam을 이용한 치면세균막 검사의 타당도와 신뢰도)

  • Kim, Mi;Lee, Su-Young;Cho, Young-Sik
    • Journal of dental hygiene science
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    • v.15 no.3
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    • pp.377-382
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    • 2015
  • The purpose of this study was to evaluate the validity and reliability of plaque scoring system using new Qraycam (All in One Bio, Korea) device which enables plaque score without tooth disclosing. This study measured Quigley-Hein index and plaque control record by both Qraycam and disclosing agent on 64 elderly people and checked degree of congruence between the two methods. Reliability was evaluated with the mean of measured values, kappa index and intraclass correlation coefficient statistical analysis. The analysis of the plaque scores showed a high agreement between the measured values according to the method of measurement and the measured part. The mean of plaque index of anterior labial were not significantly different according to measurement method. The kappa index was higher by Qraycam and tooth disclosing method of plaque index. Therefore, it was verified that Qraycam has sufficient reliability as screening tool for plaque scoring system.

Reliability, Validity, and Conversion Index of the Workload Management System for Critical Care Nurses(WMSCN) (중환자 분류도구(WMSCN)의 신뢰도, 타당도 및 환산지수 검증)

  • Yoo, Cheong-Suk;Kwon, Eun-Ok;Kim, Soon-Hee;Cho, Yong-Ae
    • Journal of Korean Critical Care Nursing
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    • v.2 no.1
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    • pp.48-57
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    • 2009
  • Purpose: The purpose of this study is to establish reliability and validity and to identify the conversion index. Method: The WMSCN for ICU was revised from Workload Management System for Nurses(WMSN) of Walter Reed Army Hospital. Reliability of the WMSCN was evaluated interrater reliability between head nurses and staff nurses at 124 patients in April 2008. Validity through the correlation between direct nursing care hours and WMSCN score was conducted at 20 ICUs of 10 hospitals. Finally the conversion index was identified by total nursing hours and it divided by WMSCN score. Results: The scores by nurses were highly correlated with head nurses’(p=.967), and also scores of the WMSCN were highly correlated with the direct nursing care hours(p<.001). The distribution of patient classification ranks into class V(61.3%), class IV(24.2%) and class VI(11.3%). The scores of the WMSCN were no differences between MICU and SICU. Finally, the conversion index was 8.2 minutes. Conclusion: WMSCN is available to classify the nursing workload for critical care patients. The repeated evaluation of validity and reliability are requisite to use WMSCN effectively. And the conversion index should be adjusted to estimate the appropriate staffing in Korea.

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A Study on Design Criteria of Rockfall Protection Fence Considering Reliability Index (신뢰성지수를 고려한 낙석방지울타리 설계기준 고찰)

  • Suk, JaeWook;Lee, JongGun;Kim, YongSoo;Moon, JoonShik
    • Tunnel and Underground Space
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    • v.24 no.4
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    • pp.275-281
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    • 2014
  • The performance criteria of rockfall protection fence and reliability index were investigated considering characteristic of rockfall energy occurred at 160 cut slopes in national highway. As a result of study on statistic of variables that decide rockfall energy using Monte-Carlo simulation, the degree of slope was normal distribution type, mass of rockfall and height of slope was lognormal distribution type. The rockfall energy follows lognormal distribution because of statistical characteristic of mass of rockfall. The reliability index of rockfall protection fence was 0.678 and the failure probability of was very high as 24.9%. Proposed performance criteria of rockfall protection fence considering the scale of domestic rockfall energy is maximum 500 kJ and the range of reliability index was from 1.028 to 1.956. the failure probability of rockfall protection fence was from 14.8 to 2.5 percent if applying the performance criteria using the reliability index.

A Study on the Construction Vibrations Prediction of Bridge Structures using the Reliability Index (신뢰성 지수를 이용한 교량 구조물의 건설진동 예측에 관한 연구)

  • 박연수;우정하;전양배;김응록;김동현
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.442-449
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    • 2003
  • This study presents a new analysis of blast vibration equations of a bridge structures using a reliability index. Changing the reliability makes each blast vibration equation. The blast equations are divided into three classes, having 50%, 90% and 99.9% at ${\beta}$=0, 1.28 and 3 respectively. In the result of this research, the assumption equations which used ${\beta}$=1.28 is suitable. By using these blast equations, it is possible for users to predict reliable ground vibration values upon demand.

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Reliability Analysis of Cantilever Retaining Wall Using Multiple Failure Modes (다중거동함수에 의한 T형 옹벽의 신뢰도 해석)

  • Park, Chun-Su;Song, Yong-Seon;Kim, Yeong-Pil
    • Geotechnical Engineering
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    • v.4 no.2
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    • pp.15-24
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    • 1988
  • To identify the stability of cantilever retaining wall in safe state by the deterministic method, these potential modes of such geotechnical failures as bearing capacity, horizontal sliding and overturning are analysed using Advanced First Order Second Moment (AFOSM) method. All design variables are assumed of the normal distribution and to be statistically independent. Considering the correlations between the single modes, structural system reliability index is 2. 05. Even if the safety factors are larger than the required value in the codes' by the conventional deterministic method, the system reliability of this structure may not be Judged to be safe state since the system reliability index is much lower than general value of 3.

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Reliability-based Approach to Optimal Economic Estimation of Concrete Cover Thickness under Carbonation Environment

  • Do, Jeong-Yun;Kim, Doo-Kie;Song, Hun;Jo, Young-Kug
    • International Journal of Concrete Structures and Materials
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    • v.3 no.2
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    • pp.103-110
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    • 2009
  • Concrete carbonation is a cause of problems in concrete structures, so it needs to be estimated. And concrete cover is designed to protect structures from this damaging. Usually the cover thickness is considered based on the limit states design codes in which the important target is the reliability safety index. However, it is not clear that whether the safety index determined is optimal or not with respect to the cost. The codes are mainly proceeded quantitatively (i.e. making a safe structure) while the economic aspects are only considered qualitatively. So the reliability-based design considering life cycle cost (LCC) is called for, and here the focus is on the advanced analysis solution to optimize the reliability safety regarding LCC.

A Study on the Reliability of Superconducting Fault Current Limiter and Adjacent Distribution Equipments (초전도한류기와 인근 배전설비의 신뢰도에 관한 연구)

  • Bae, In-Su;Kim, Sung-Yul;Kim, Jin-O
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.11
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    • pp.2122-2127
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    • 2009
  • This study presents the failure rate and repair rate of Superconducting Fault Current Limiter(SFCL) and adjacent distribution equipments. When the fault current penetrated SFCL, the supply of electric power to the customers can be partly continued. It is expected that SFCL makes to improve the reliability index of customers. Contrary to the expectations, the series connection between SFCL and distribution system could deteriorate the reliability index. To evaluate the reliability index in the distribution system including SFCL, the failure rate and repair rate of SFCL are required as well as that of distribution equipments. Also, the insertion of SFCL makes to change the failure rate and repair rate of adjacent equipments. This study proposes a method to calculate the failure rate and repair rate of a component combining SFCL and adjacent equipments.

A Reliability Analysis on the To-Box Reinforcement Method of PSC Beam Bridges (PSC보의 박스화 보강방법의 신뢰성해석)

  • Bang, Myung-Seok
    • Journal of the Korean Society of Safety
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    • v.21 no.3
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    • pp.94-100
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    • 2006
  • The goal of this study is to show the way to increase the safety of deteriorated PSC beam bridges by the to-box reinforcing method. This method is to change the open girder section into the closed box section by connecting bottom flanges of neighboring PSC girders with the precast panels embedding PS tendons at the anchor block. The box section is composed of three concrete members with different casting ages, RC slab, PSC beam, precast panel. This different aging requires a time-dependent analysis considering construction sequences. Reliability index and failure probability are produced by the AFOSM reliability analysis. Transversely five schemes and longitudinally two schemes are considered. The full reinforcing scheme, transversely and longitudinally, shows the highest reliability index, but it requires more cost for retrofit. The partial reinforcing scheme 4, 4-1 are recommended in this study as the economically best scheme.