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Novel serpentine structure design method considering confidence level and estimation precision

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第3期14卷 222-234页

作者： Li-sheng CHEN Xiao-hua LUO Jiao-jiao ZHU Fan-chao JIE Xiao-lang YAN Institute of VLSI Design Zhejiang University

Due to the importance of metal layers in the product yield,serpentine test structures are usually fabricated on test chips to extract parameters for yield *** this paper,the confidence level and estimation precision of the average defect density on metal layers are investigated to minimize the randomness of experimental results and make the measured parameters more *** the basis of the Poisson yield model,the method to determine the total area of all serpentine test structures is obtained using the law of large numbers and the Lindeberg-Levy ***,the method to determine an adequate area of each serpentine test structure is proposed under a specific requirement of confidence level and estimation *** results of Monte Carlo simulation show that the proposed method is consistent with theoretical *** is also revealed by wafer experimental results that the method of designing serpentine test structure proposed in this paper has better performance.

关键词： Poisson yield model Serpentine test structure Critical area Average defect density confidence level Estimation precision

confidence level Based on Ridge Estimator in Process Measurement and Its Application

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Chinese Journal of Chemical Engineering 2013年第10期21卷 1144-1154页

作者：岳元龙左信罗雄麟 Department of Automation China University of Petroleum Beijing 102249 China

Ordinary least squares(OLS) algorithm is widely applied in process measurement, because the sensor model used to estimate unknown parameters can be approximated through multivariate linear model. However, with few or noisy data or multi-collinearity, unbiased OLS leads to large variance. Biased estimators, especially ridge estimator, have been introduced to improve OLS by trading bias for variance. Ridge estimator is feasible as an estimator with smaller variance. At the same confidence level, with additive noise as the normal random variable, the less variance one estimator has, the shorter the two-sided symmetric confidence interval is. However, this finding is limited to the unbiased estimator and few studies analyze and compare the confidence levels between ridge estimator and OLS. This paper derives the matrix of ridge parameters under necessary and sufficient conditions based on which ridge estimator is superior to OLS in terms of mean squares error matrix, rather than mean squares *** the confidence levels between ridge estimator and OLS are compared under the condition of OLS fixed symmetric confidence interval, rather than the criteria for evaluating the validity of different unbiased estimators. We conclude that the confidence level of ridge estimator can not be directly compared with that of OLS based on the criteria available for unbiased estimators, which is verified by a simulation and a laboratory scale experiment on a single parameter measurement.

关键词： process measurement confidence level ridge estimator variance bias

Evaluating the confidence level of Traditional Chinese Medicine in nursing undergraduates at Chinese medical university

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Frontiers of Nursing 2022年第3期9卷 263-268页

作者： Rui-Min Jia Zhi-Lan Yang Jing Zhou Xiao-Fen Wu Xuan-Xuan Li School of Nursing Shanxi University of Chinese MedicineJinzhongShanxi 030619China Shanxi University of Chinese Medicine JinzhongShanxi 030619China

Objective:To observe the confidence level prevailing with regard to the practice of Traditional Chinese Medicine(TCM)among undergraduate nursing students who have undertaken TCM courses at Shanxi Medical ***:This cross-sectional study was conducted at Shanxi University of Chinese Medicine.A questionnaire survey was administered through the Questionnaire Star website(https://***/).The confidence level was examined from 6 aspects,namely cognition of TCM culture and theory,advantages and characteristics of TCM diagnosis and treatment,feelings about TCM achievements,personal behaviors related to TCM,attitudes toward Western medicine,and the future of *** mean score of the observed items was calculated,and was found to be positively related to the confidence level concerning TCM(the score was between 1 and 5).Results:A total of 120 participants voluntarily enrolled themselves in the *** results showed that the mean score of observed items were generally about 4.A relatively strong confidence was shown in understating TCM advantages and characteristics in diagnosis and treatment,and also in feelings toward TCM ***:The majority of nursing undergraduates had confidence in ***,some aspects such as the understanding of TCM culture and the correlation between TCM and Western medicine may need to be improved through education.

关键词： Chinese medical university confidence level nursing undergraduate TCM questionnaire Traditional Chinese medicine

confidence level of System Spares OptimizationUsing Fuzzy Theory

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International Journal of Plant Engineering and Management 2000年第1期5卷 12-16页

作者： Liu Xiaodong Zhang Hengxi(Airforce University of Engineering, Xi’an 710038, RR.China)

To obtain a higher readiness for a complex system, the common method is to store some spares. confidence level of system spares is an important parameter to control the probability of the spares required. By introducing fuzzy theory, this paper allocates the confidence level of system spares to its subsystems, thus to achieve a rational management of system spares,

关键词： spares confidence level fuzzy theory optimization.

Probabilistic safety assessment of self-centering steel braced frame

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 163-182页

作者： Navid RAHGOZAR Nima RAHGOZAR Abdolreza S. MOGHADAM Department of Structural Engineering Science and Research Branch Islamic Azad University Tehran Iran Structural Engineering Research Center International Institute of Earthquake Engineering and Seismology (IIEES) Tehran Iran

The main drawback of conventional braced frames is implicitly accepting structural damage under the design earthquake load, which leads to considerable economic losses. Controlled rocking self-centering system as a modem low-damage system is capable of minimizing the drawbacks of conventional braced frames. This paper quantifies main limit states and investigates the seismic performance of self-centering braced frame using a Probabilistic Safety Assessment procedure. Margin of safety, confidence level, and mean annual frequency of the self-centering archetypes for their main limit states, including PT yield, fuse fracture, and global collapse, are established and are compared with their acceptance criteria. Considering incorporating aleatory examined. Results of the investigation indicate that the provide the adequate margin of safety against exceeding and epistemic uncertainties, the efficiency of the system is design of low- and mid-rise self-centering archetypes could the undesirable limit-states.

关键词： self-centering steel braced frame mean annual frequency safety assessment confidence level margin of safety

Investigation on Thermal Contact Conductance Based on Data Analysis Method of Reliability

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Chinese Journal of Aeronautics 2012年第5期25卷 791-795页

作者： WANG Zongren YANG Jun YANG Mingyuan ZHANG Weifang School of Reliability and System Engineering Beihang UniversityBeijing 100191China

The method of reliability is proposed for the investigation of thermal contact conductance （TCC） in this study. A new defini- tion is introduced, namely reliability thermal contact conductance （RTCC）, which is defined as the TCC value that meets the reliability design requirement of the structural materials under consideration. An experimental apparatus with the compensation heater to test the TCC is introduced here. A practical engineering example is utilized to demonstrate the applicability of the pro- posed approach. By using a statistical regression model along with experimental data obtained from the interfaces of the struc- tural materials GH4169 and K417 used in aero-engine, the estimate values and the confidence level of TCC and RTCC values are studied and compared. The results show that the testing values of TCC increase with interface pressure and the proposed RTCC model matches the test results better at high interface pressure.

关键词： thermal contact conductance thermal contact resistance confidence level compensation heater reliability aero-engine

A confidence-based Consensus Model for Multi-Attribute Group Decision Making:Exploring the Bounded Trust Propagation and Personalized Adjustment Willingness

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Journal of Systems Science and Systems Engineering 2023年第4期32卷 483-513页

作者： Ling Pan Zeshui Xu Business School Sichuan UniversityChengdu 610064China

Social trust network(STN)and minimum cost consensus(MCC)models have been widely used to address consensus issues in multi-attribute group decision-making(MAGDM)problems with limited ***,most researchers have overlooked the decision maker‘(DMs)’confidence levels(CLs)and adjustment willingness implicit in their *** address these problems,this paper explores a confidence-based MCC model that considers DMs’adjustment willingness in the *** proposed model includes several modifications to the traditional trust propagation and consensus optimization ***,the improved method for measuring CLs of DMs and the confidence-based normalization approach are defined,***,the bounded trust propagation operator is proposed,which considers the credibility of mediators to complete the ***,the identification rules based on the consensus index and CL are defined,and the MCC model with personalized cost functions and acceptable adjustment thresholds is built to automatically generate adjustment values for non-consensus ***,a model to identify the non-cooperative behavior at the element level is established and the hybrid MCC model with persuasion strategies is ***,a case study is processed to verify the applicability of the proposed model,and comparison and sensitivity analysis are conducted to highlight its benefits.

关键词： confidence level social trust network bounded trust propagation minimum cost consensus models multi-attribute group decision making

FUZZY STABILITY ANALYSIS OF MODE COUPLING CHATTER ON CUTTING PROCESS

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 30-35,56页

作者： Kong, Fansen Yu, Junyi Jilin Univ of Technology China

The influence of fuzzy uncertainty factors is considered on the analysis of chatter occurring during machine tool cutting process. Using fuzzy mathematics analysis methods, a detailed discussion over fuzzy stability analysis problems is presented related to the mode coupling chatter with respect to intrinsic structure fuzzy factors, and the possibility distribution of the fuzzy stability cutting range and the confidence level expressions of the fuzzy stability cutting width are given.

关键词： Fuzzy uncertainty Mode coupling chatter Fuzzy stability cutting range Possibility distribution confidence level

Linguistic aggregation operators under interval confidence levels

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Linguistic aggregation operators under interval confidence l...